Analysis And Optimization Of Punching And Wrinkling In The B-pillar Area Of ​​The Rear Door Outer Panel

Analysis And Optimization Of Punching And Wrinkling In The B-pillar Area Of ​​The Rear Door Outer Panel


The door outer panel is a medium-sized outer cover in the body-in-white, and the main ridgeline feature on the side of the vehicle generally runs through the front and rear door outer panels.Since the door is a moving part, it involves the matching of multiple flatness and gaps, and it is also the part most intuitively observed by users, and its forming quality requirements are very strict.In order to realize the dynamic shape of the whole vehicle, most mainstream automobile factories have made the characteristic ridgeline design more and more protruding, the angle between the profiles on both sides of the ridgeline is getting smaller and smaller, and the ridgeline fillet radius is on the premise of meeting the national standard. The corner radius is designed according to the limit value of 2.5 mm, which puts forward higher requirements on the stamping process, especially the more complex rear door outer panel. Based on this type of rear door outer panel, the reasons for wrinkling defects in the B-pillar area during traditional stamping process are analyzed, and the improved stamping process is adopted to eliminate the wrinkle defects of the parts and meet the requirements of the forming quality of the parts.

1 Rear door outer panel structure

Figure 1 shows the shape of the outer panel of the rear door of a certain model. There are two characteristic ridgelines. Both sides of the ridgeline are curved surfaces with a certain angle. The included angle of the main ridgeline is about 134°, and the radius of the ridgeline is R2.5 mm . There are steps in the B-pillar area of ​​the whole vehicle. The radii of the two rounded corners of the steps are R1.2 mm and R2 mm respectively. The structure of the intersection of the main ridgeline and the B-pillar area is shown in the circle in Figure 1, which is visible after the front door is opened. . According to the requirements of the quality standard of Kangzin, there should be no obvious surface defects after single piece and after painting, and the defect level should not be higher than Class C.

2 Wrinkling analysis and optimization of the B-pillar area of ​​the rear door outer panel

2.1 Stamping process of rear door outer panel

Aiming at the stamping process design of the door outer panel, the stamping direction, process supplement, drawing depth and process arrangement are discussed. For the rear door outer panel, except for the B-pillar area, the process supplement is relatively simple. Generally, deep drawing, trimming and straight flanging are required. If there are special requirements for pressing, the side flanging process needs to be added; for the B-pillar of the rear door outer panel In the area, the supplementary section and related parameters of the traditional process are shown in Figure 2. Due to its modeling characteristics, it cannot be directly deep-drawn and formed. It needs to be formed by deep-drawing, trimming, step shaping and flanging. , b value is generally 0.5~2 mm, R1 is 3~6 mm, R2 is 5~8 mm, h is 0~2 mm; A value is 0~10°. The smaller the value of each parameter, the closer the drawing process supplement is to the final part shape, the smaller the shaping amount, and the more serious the corresponding drawing thinning rate, on the contrary, the smaller the deep drawing thinning rate, but the corresponding secondary shaping amount increases. It is easy to produce surface defects and springback; the idea of ​​process design is generally to adjust various parameters to minimize the amount of shaping under the premise of ensuring the quality of deep drawing.

2.2 Wrinkle analysis

The B-pillar area of ​​the rear door outer panel adopts the above-mentioned stamping process, and the drawing process adopts the minimum drawing depth under the premise of ensuring the overall thinning rate > 3%. After deep drawing, secondary shaping was performed on the step. The results are shown in Figure 3. The thinning rate after deep drawing was 28.4%, and the thinning rate of the cusp area after shaping reached 30%. Severely wrinkled, the part is formed in a state of simultaneous wrinkling and cracking.

The local forming process of the ridgeline is shown in Figure 4. The material at the ridgeline is pressed down by the shaping inserts. As the shaping depth increases, the materials on both sides of the ridgeline are unevenly distributed, and local materials accumulate, and finally they are stacked together. Severe warpage occurs at the edge of the material. After shaping to the end, the wrinkled material cannot be unfolded, and the parts are wrinkled.

The local stress state during the shaping process is shown in Figure 5. Due to the deep-drawing effect of the shaping insert on the sharp point of the ridge line, the primary and secondary stresses are greater than 0, and the state is in the state of tensile stress. After shaping, the material at the sharp point area is thinned. . The primary and secondary stress values ​​in the local area below the insert are all less than 0, and it is in a state of compressive stress. According to the maximum shear stress criterion, if the equivalent compressive stress value exceeds the critical value of instability, the plastic deformation condition is reached, and the local material is compressive instability. , causing parts to wrinkle.

In order to solve the wrinkling of the parts, the following measures can be considered:

  • ①Reduce the excess material after deep drawing, that is, the deep drawing forming is as close to the part as possible, and at the same time reasonably distribute the reshaped materials on both sides of the ridge line;
  • ② Change the stress state of the wrinkled area, Reduce compressive stress and eliminate material wrinkling;
  • ③ impose constraints on wrinkled materials to inhibit material instability.

2.3 Wrinkle optimization

Combined with the above analysis, using the shaping process shown in Figure 6, a movable blanking plate is added to the lower die. During forming, the upper die insert goes down to contact the blanking plate, and only a small part of the material is shaped before contacting the blanking plate, and then Press the sheet together, and apply tensile stress to the end of the sheet to improve the stress state and reduce the compressive stress. The stress distribution during the forming process is shown in Fig. 7. Compared with the process before optimization, the compressive stress is significantly reduced. The free end of the material is restrained by the pressing plate, and the instability of the material is restrained. At the same time, one forming is reduced in the deep drawing process to ensure uniform shaping on both sides of the ridgeline before the clamping.

The shaping process is shown in Figure 8. There are no wrinkles during the entire shaping process. The relative height of the steps decreases during deep drawing. The thinning rate at the sharp point of the ridge line is reduced to 16%, and the final thinning rate after shaping is 26.3%. , greatly improving the stability of the deep drawing process. The actual production adopts this process, and the final part has no local wrinkle and cracking phenomenon, and the forming quality meets the requirements as shown in Figure 9.

3 Conclusion

Through the analysis of the traditional forming process and the improved process of the B-pillar area of ​​the rear door outer panel, the following conclusions are drawn.

  • (1) When using the traditional process method, wrinkling defects occur in the B-pillar area of ​​the rear door outer panel, and the thinning rate also reaches the limit state, and the formed parts cannot meet the quality requirements.
  • (2) In order to ensure deep drawing, the local process supplement is “multi-material” relative to the part. During the shaping process, the part of the excess material is in a state of compressive stress, which leads to compression instability, and the unstable part is unconstrained, and the final part is wrinkled. defect.
  • (3) By using deep drawing “shallow” forming (meaning that there is no wrinkling due to the material clamping process guarantee, the deep drawing can be shallower than the traditional process, which can reduce the drawing thinning rate and make the deep drawing The process is more stable), and the subsequent use of the clip shaping process not only optimizes the thinning rate of deep drawing, but also solves the wrinkling defect, and the forming quality of the parts meets the requirements, which has certain guidance for the stamping process design and quality optimization of such parts. significance.

Sheet fabrication services for mild steel, high strength low alloy (HSLA) steel, cold/hot rolled steel, galvanized steel, stainless steel, aluminum, copper and brass. Capable of fabricating parts up to 12 ft. length and +/-0.001 in. tolerance. Various capabilities include contract manufacturing,custom stamping,edge rolling, forming,top laser cutting, roll bending and welding. Finishing and secondary services such as hardware installation, tapping, deburring, cleaning, heat treating, plating, anodizing and painting available. Sheet Metal Prototype and low to high volume production runs offered. Suitable for commercial/residential architectural, aluminum brake shape parts, wall panel systems, brackets, general flashings, rails, call button plates and ship building component parts.

Some Opinions On The Design And Production Maintenance Of Precision High-Speed Stamping Dies

Some Opinions On The Design And Production Maintenance Of Precision High-Speed Stamping Dies


Precision high-speed stamping production technology is widely used in electronics, automobiles, optics, industrial control, medical and other fields due to its advantages of high efficiency, high quality, consistency, and cost savings. Today, with the highly developed market economy and the rapid development of science and technology, high-speed, precise Stamping technology has been paid more and more attention by many related industries in industrial production, and its high efficiency, reliability and stability have become the main subject of continuous breakthrough and research in continuous stamping technology. Today’s molds are updated and the pace of technological innovation is getting faster and faster. The application of rapid development, automation technology, optical technology, and electromechanical integration technology has also been continuously applied and made breakthroughs. With the advancement of “Made in China 2025”, precision high-speed stamping technology will also usher in an opportunity for benign development.

Precision high-speed stamping die structure and typical production process design

The commonly used structures of precision high-speed stamping dies are two-plate molds, drawer molds (modular molds) and three-plate molds (also known as eight-plate molds)

The two-plate die is designed and fixed on the lower die plate with the functional structure of stamping and stripping. The whole set of die is named after two relatively independent whole. It is characterized by high precision and small stamping stroke, but due to the high processing cost of mold parts, it is largely replaced by three-plate molds.

The drawer mold is evolved from the structure of the three-plate mold. The template is designed as a modular type, and the mold base is designed to adapt to the structure of rapid loading and unloading of multiple modules. Quick die change has become a veritable synonym for its name, but due to its relatively complex structure, high die manufacturing cost, and high requirements for punching parameters, its application is more limited to the stamping production of products with multiple material numbers.

Three-plate die, as the name suggests, is composed of three template groups: upper die, stripper plate, and lower die. It is suitable for stamping production of single material number or small material number. Due to its simple structure, low processing cost, high precision, convenient maintenance and stability It has good characteristics and is adopted by most mold design and stamping manufacturers. Relatively speaking, the three-plate mold can replace the two-plate mold to a certain extent, and the drawer mold has more advantages in the production of multiple material numbers. Therefore, the three-plate mold and the drawer mold have become the mainstream of the precision high-speed stamping industry at this stage.

No matter what kind of mold, its working principle and functional structure are the same. From the working principle, they all drive the relative movement of the die parts through the up and down movement of the punching block and act on the material to be punched, so that they can complete the process of separation or plastic deformation such as punching, bending, etc. From the perspective of functional structure composition The mold is composed of 7 major parts (Fig. 10, the main structure of the field (the mold base template), the carrier of the mold. <2) the guiding element (the guide post and the guide sleeve), the main guiding function of the mold. (3) Pressing and discharging system (stripping plate, Power transmission pin, compression spring, contour sleeve, etc.) Pressing and discharging function of stamping process. (4 Jiang as components (punch, cutting edge, forming, adjustment) Parts, etc.) are directly involved in the core functional parts of material separation and plastic deformation. <5) Positioning elements (positioning needles, guide plates, stripping inserts) ensure the smooth running of the material strip in the mold and the accuracy of the working position of the working elements . (6) Fixed components (screws, positioning pins, pressing blocks, blocks), the relative positions of formwork and formwork, parts and formwork are fixed (7) Auxiliary parts (floating material pin, spring height limit column), material belt auxiliary support and Mold protection and other functions.

Typical stamping process design

There are many types of precision stamping process structures, each with its own process design, production and maintenance characteristics, such as shrapnel bending for contacts, v-CUT forming for pre-breaking, rib stretching for shielding and partitioning, and Mold processes such as tin foot piercing of solder plates, barb blanking for assembly, and needle bar blanking for transmission are typical examples of its production applications. Here, the author introduces several typical mold process structure design schemes for readers’ reference. Figure 2 shows a partial view of the FPC terminal. The shearing surface is the contact part, so the shearing surface should be uniform and higher than the tearing surface without turning over. In the case of limited product pressing material, in addition to local strong pressure, rough cutting + fine cutting is often used in mold design to reduce excessive punching force and internal stress. product impact. Figure 3 shows the blanking of small terminals. Similarly, because the pressing area is too small and the pressing force is insufficient during blanking, the product is pulled out and turned over because the pressing force is less than the punching force during the punching and shearing process. Therefore, the method of fine cutting + rough cutting can also be used to improve the blanking quality when producing such terminals. Furthermore, let’s talk about the design of the bending process. Generally, the mold design personnel know the expansion of the bending. It mainly depends on the bending neutral line of the material. The bending rebound mainly depends on the rebound coefficient of different materials (of course, conditions such as stamping speed, mold lubrication, mold temperature, material texture, etc. will also affect the value of bending parameters) Different materials Neutral line calculation and rebound coefficient, except for special materials, have basically accumulated relatively accurate experience values ​​for designers to choose and calculate. As shown in Figure 4, the basic steps of bending and unfolding are briefly explained. In addition, the size adjustment structure is also a commonly used function of precision stamping dies, especially for multi-pin terminals, the mold parts cannot be absolutely accurate. After stamping, it is difficult to effectively guarantee the dimensional consistency of multi-pin terminals.

The in-mold fine-tuning of each PIN alone can well correct the deviation of the bending size. As shown in Figure 5, in the design, the bending size is set to slightly exceed the upper limit value, and then each pin is fine-tuned to different degrees. In order to achieve the purpose of better consistency of the elastic height and size.

The design of the mold should be a comprehensive technical whole. From the functional requirements of the product, process requirements, assembly and use requirements, and other factors, it is necessary to analyze what effect the mold design needs to achieve to meet the real needs of the product. The mold structure, technology and other means are used to realize the above-mentioned multi-dimensional requirements.Therefore, the mold design itself is a part of the whole of this technology, not the whole. For example, the design of the shrapnel as a contact (Fig. 6) should have contact transmission characteristics in terms of product function, and good contact is required, so how to control the surface roughness of the contact area? Ensure that the contact point is the most reliable place for the shrapnel, which is the key to the mold design. From the process requirements, we should think about how to control the bending expansion, how to prevent the two sides of the contact from being higher than the middle after bending, and how to prevent the bending skew, etc. , From the assembly use, what should be considered is what kind of design process can better improve the fatigue life of shrapnel assembly insertion and extraction. Other influencing factors, material material characteristics, punching speed punch tonnage, electroplating dimensional changes, heat treatment springback, etc. are directly or Indirectly affects the choice of mold design structure, the design layout process, the consideration of the material and processing method of the parts, and the value of design parameters

In the preliminary work of the precision mold design, if the designer can fully think and analyze the mold design according to the above or more dimensions, it will be a matter of course. The designed mold is only the carrier of the designer’s dimension. The requirements can be naturally reflected, so the mold design work is regarded as the overall technology of mold design from multiple dimensions, and the function, process, application and mold characteristics of the entire product can be truly achieved in terms of concept and behavior. High speed and precision.

Use, maintenance and workshop management of precision high-speed stamping dies

A set of high-efficiency, stable, high-quality precision high-speed stamping dies not only needs to analyze and design product functions, processes, applications, and mold design structures in the early stage of design, but also in the normal production process of molds. It directly affects the use effect and life of the mold.

In the use of molds, taking the setting and use of frame conditions as an example, the precise setting and curing of frame conditions parameters play a pivotal role in production efficiency and quality stability. In the case that the special mold and special machine cannot be met, the one-to-one correspondence between the mold and the punch frame mold conditions can well meet the requirements of the curing of the conditional parameters, that is, one mold, one machine, one conditional parameter, and one mold N machine has N conditional parameters. The specific operation is to first select a punch with a suitable tonnage and suitable structure according to the overall requirements of the mold, and then set and fine-tune the theoretical value of the mold parameters to achieve the ideal state of the frame mold adjustment machine and follow up the production quality status to meet the requirements of the process capacity. It is defined as the fixed parameters of the mold in the machine, and then the frame mold production is carried out according to the fixed parameters to achieve the purpose of stable condition curing. In the same way, the conditions of the mold are set on other machines to form a series of fixed conditions. Frame mold condition parameters, these condition parameters provide the most fundamental guarantee for production efficiency and quality stability.

The purpose of mold maintenance is to maintain the excellent and stable production state of the mold and improve the service life of the mold. Generally speaking, the maintenance can be divided into the following four stages. The field inspection stage is to check whether the parts are loose and worn, and repair, polish and lubricate them. and other basic maintenance work. Return the mold to the design state. (2) In the part replacement stage, it is confirmed that the parts are worn and cannot meet the production quality requirements and the relevant blanking parts will be ground when the life of the parts is reached. Replacement of formed parts. (3) Guide precision maintenance The overall precision of the mold comes from the guide elements of the mold. When it is worn to a certain extent. When the required accuracy cannot be provided. It is replaced and precision repaired to restore guiding precision. (4) Mold refurbishment, the template mold base is the main body of the mold, and its overall accuracy will naturally affect the accuracy of the mold. Fitter correction, precision adjustment or even replacement of individual or main templates, to restore the mutual gap, flatness, verticality, etc. of the templates. No matter which stage, the purpose is to maintain and restore the accuracy of the mold. make it in good condition. Here, an important term is involved: die life (number of strokes). For each inspection and maintenance, the corresponding number of punches is the corresponding punching life of each stage. It depends on the material characteristics of the material to be stamped, the material of the mold parts, the stamping speed and other factors. during production process. It is necessary to record the cumulative number of strokes every day, which can better manage the time and frequency of mold maintenance and understand the life status of the mold more freshly.

In terms of mold maintenance, the author believes that we should focus on grasping the root of the problem and analyzing it, such as product size. In general, the idea of ​​maintenance should be based on the basic positioning of the reference hole in the mold to ensure that the reference is correct, and then the analysis of the station or the material belt is carried out. Instead of seeing the blanking gap is unilateral. Just move the cutting edge, reduce the bending gap when the bending is not in place, etc. “When you see the phenomenon, take a countermeasure. The maintenance method is a conditional reaction type, because it is easy to lead to the confusion of maintenance standards, and the more the mold is repaired, the more problems there are. A vicious circle. In addition, the common problem faced by precision high-speed stamping is the problem of chip jumping. I will also briefly talk about the view here. The chip jumping originates from the punched scrap and is brought out of the die surface by external force, and this external force may be atmospheric pressure. The interaction with the vacuum, the viscous force generated by the adhesion of oil stains, the thrust generated by the gas in the mold, and the force generated by the vibration during the stamping process of the mold, and the relative solutions are also various, and the advantages and disadvantages of each are clear. The idea of ​​​​solving the problem is also similar, that is to reduce the generation of this “force”, or create a relative force to offset the external force that causes the chip to jump. From the product, you can change the shape of the scrap to increase the contact area with the mold and increase the frictional force. From the mold structure, you can use the blade coating method, the blade clamping structure, the punch special-shaped structure, the T-shaped blanking hole, etc. From other external forces, you can add a blowing device from top to bottom to form negative pressure , the effect of atmospheric pressure produces a downward suction on the waste chips, or a suction device is added from below to directly suck up the waste, as shown in Figure 7. From the production conditions, the amount of punching oil can be adjusted, and the punching SPM can be adjusted. In short, it is possible to fundamentally distinguish problems and think in multiple dimensions, and the ideas and methods of mold maintenance are ever-changing.

New application and progress of precision high-speed stamping technology

With the iteration of scientific and technological innovation, precision stamping continues to expand the scope of application with its unique advantages such as high efficiency and repeatability, especially in terms of product function expansion, such as the shear surface as the functional area of ​​the product, which will inevitably affect the shear surface. There are very high requirements for quality, and the needs of bright and flat, no burr, no stamping sag, full bright belt, etc. continue to expand the ideas of precision stamping designers. In terms of processing methods, in the processing of some products, precision stamping has successfully completed the process that could only be completed by die-casting Cnc, lathes, etc., thereby greatly improving production efficiency and reducing production costs. In terms of process technology, the precision stamping process combined with automation technology, the precision stamping process combined with photoelectric technology, the non-waste stamping process, the low-stroke ultra-high-speed stamping process, and the multi-material belt mold design process have gradually been adopted by the precision high-speed stamping industry. Use, technical capabilities are also constantly innovating.

As a practitioner of precision high-speed stamping, maintain a dedication to technology and the original intention of continuous pursuit from preliminary analysis, mold design, production and maintenance to technological innovation and application, and continue to explore and excavate with the attitude of excellence. my country’s precision high-speed stamping It is just around the corner for technology to ride on the east wind of “Made in China 2025” and stand on the top of the world industry.

 

Sheet fabrication services for mild steel, high strength low alloy (HSLA) steel, cold/hot rolled steel, galvanized steel, stainless steel, aluminum, copper and brass. Capable of fabricating parts up to 12 ft. length and +/-0.001 in. tolerance. Various capabilities include contract manufacturing,custom stamping,edge rolling, forming,top laser cutting, roll bending and welding. Finishing and secondary services such as hardware installation, tapping, deburring, cleaning, heat treating, plating, anodizing and painting available. Sheet Metal Prototype and low to high volume production runs offered. Suitable for commercial/residential architectural, aluminum brake shape parts, wall Panel systems, brackets, general flashings, rails, call button plates and ship building component parts.

What Are The Outstanding Advantages Of Carbon Fiber Rollers

What Are The Outstanding Advantages Of Carbon Fiber Rollers


The application forms of carbon fiber composite materials in the industrial field are diversified, and carbon fiber rollers are a relatively common application form. Compared with traditional metal rollers, what are the outstanding advantages of carbon fiber rollers? In this article, the editor of the Be-cu prototype will introduce it to you.
 
Carbon fiber is an excellent weight-reducing material. Its density is only 1.7g/cm3, which is 60% of aluminum alloy and less than 1/4 of steel. The lighter the mass, the smaller the inertia, and the higher the work efficiency. Most machines also choose to use carbon fiber rollers instead of metal rollers because of this advantage.
 
Carbon fiber is a fiber material, but its mechanical properties are better than most metal structural materials. Its tensile strength can reach more than 3000MPa, which is several times that of steel. At the same time, its specific strength and specific modulus comprehensive indicators are better than most structures. The material also has outstanding flexural strength and shear strength, which meets the needs of use strength. Carbon fiber is a non-metallic material with excellent corrosion resistance and anti-aging properties and long service life.
 
In order to prolong the service life of the roller, it is necessary to avoid the overload operation of the roller, regularly clean the foreign matter on the carbon fiber roller, check whether the welding between the roller shell and the end cover is firm, and solve the problem even if it is found. China Be-cu Prototype Material Technology Co., Ltd. is a professional manufacturer of carbon fiber products, which can meet the needs of customers in various fields of carbon fiber products, and is committed to bringing high-quality carbon fiber products to customers.

 

ISO 9001 certified. BE-CU Prototype Offering CNC machining carbon fiber and other manufacturing services for carbon fiber marterial. Various capabilities include notching, labeling, drilling carbon fiber, grinding, laser cutting carbon fiber, finishing, plating, marking, CNC milling carbon fiber and turning carbon fiber.We stock high quality 3k carbon fiber sheet in a variety of thickness, types and finish. Its a great material used in applications where light weight and strength are needed such as drones. Unlike other workshops, we have no min order and are often filling orders with a single part. We also don’t make you pay for the full sheet and you only get charged for what is used. With a large selection of material, you should find everything you need to make your project come to life. We are also able to handle larger production runs and provide a competitive pricing. If we don’t have the material or finish you require, we are more the willing to look at bringing it in for you.

What Is Carbon Fiber?Carbon fiber is made of polyacrylonitrile (PAN) (or pitch, viscose) and other organic fibers by carbonization (removal of most elements except carbon) by pyrolysis method under inert gas at high temperature above 1,000 °C. Inorganic polymer fibers with a carbon content of more than 90%.

Carbon Fiber Composite Materials Are Committed To The Development Of Rail Transit

Carbon Fiber Composite Materials Are Committed To The Development Of Rail Transit


We are all familiar with high-speed rail. It shortens the distance between regions. China has now mastered the core technology of manufacturing high-speed rail, as well as a full set of production technologies. For carbon fiber composite materials, most people may not know that it is a new type of structural material. So if these two seemingly unrelated objects are mentioned together, what is the connection between them? In fact, carbon fiber composite materials can be used to make the shell of high-speed rail.
 
 
 
High-speed rail requires a lot of Power. In order to meet the goals of energy saving and safety, the requirements for high-speed rail materials are light weight and high strength, and the density of carbon fiber composite materials is low. In the past, aluminum alloys were used to make car bodies because of the high specific strength of aluminum alloys, but the specific strength of carbon fiber composite materials is much higher than that of aluminum alloys, which can improve the overall safety performance.
 
When the train is running at high speed, it will encounter strong resistance. The carbon fiber composite material can use the advanced integrated molding process to make a front end that meets the requirements of aerodynamic line shape, and has excellent impact resistance. Even when the train runs at a speed of 300Km/h, it has good dimensional stability. Carbon fiber also has fatigue resistance, fire safety and other indicators that can meet the requirements of high-speed rail. It is believed that carbon fiber composite materials will definitely shine in the application of high-speed rail.
 
China Be-cu Prototype Material Technology Co., Ltd. introduced Japan’s Toray T300 and T700 high-performance carbon fiber raw materials, which can meet the application and manufacture of high-end parts and components in the fields of rail transit, automobile, aviation and military industry. The company has successively reached strategic cooperative relations with domestic first-class enterprises such as China South Locomotive Group and Mitsubishi Heavy Industries to provide them with high-quality carbon fiber products.

 

ISO 9001 certified. BE-CU Prototype Offering CNC machining carbon fiber and other manufacturing services for carbon fiber marterial. Various capabilities include notching, labeling, drilling carbon fiber, grinding, laser cutting carbon fiber, finishing, plating, marking, CNC milling carbon fiber and turning carbon fiber.We stock high quality 3k carbon fiber sheet in a variety of thickness, types and finish. Its a great material used in applications where light weight and strength are needed such as drones. Unlike other workshops, we have no min order and are often filling orders with a single part. We also don’t make you pay for the full sheet and you only get charged for what is used. With a large selection of material, you should find everything you need to make your project come to life. We are also able to handle larger production runs and provide a competitive pricing. If we don’t have the material or finish you require, we are more the willing to look at bringing it in for you.

What Is Carbon Fiber?Carbon fiber is made of polyacrylonitrile (PAN) (or pitch, viscose) and other organic fibers by carbonization (removal of most elements except carbon) by pyrolysis method under inert gas at high temperature above 1,000 °C. Inorganic polymer fibers with a carbon content of more than 90%.

Analysis And Improvement Of Quality Objection Of Stamping And Cracking Of Strip With Thickened Cover

Analysis And Improvement Of Quality Objection Of Stamping And Cracking Of Strip With Thickened Cover


Accepting customer complaints is an important channel to understand customer demands and solve problems for customers. At the same time, it is an important way to improve the company’s product quality and service. There are thousands of customer complaints. Tangsteel divides the objections raised by customers into three parts: quality objection, measurement objection and logistics objection according to the attributes of the company’s handling department. Strengthening the management of quality objection helps to improve product quality, improve customer service quality, and improve customer loyalty.

1 The main problem of quality objection

Taking the quality objection of the annealed sheet in the No. 1 branch of Tangsteel’s cold-rolled sheet factory in 2016 as an example, it analyzes how to improve the quality of products by strengthening the management of quality objection. In 2016, the first branch of the cold-rolled sheet factory had an annual output of 800,000 tons of annealed sheets, and a total of 17 quality objections were paid, totaling 879.325 tons. Among them, the statistics of objection reasons are shown in Table 1. Stamping cracking is the main reason for quality objection, totaling 576.62 tons, accounting for 65.6% of the total. Among these 12 quality objections for stamping cracking, steel grades are DC01,1, DC01 – BD, 3, and DC03,8. Through the analysis of the quality objection, the stamping and cracking of the low carbon cold-rolled deep-drawing steel strip DC03 should be the key problem of the first branch.

2 Main reasons and analysis of stamping cracking

The technological process of low carbon cold-rolled deep-drawing steel strip DC03: molten iron pretreatment → converter → LF furnace → continuous casting → 1700 line rolling mill → (R1 rough rolling → F1~F7 finishing rolling), or 1810 line rolling mill (vertical rolling mill → R1, R2 rough rolling → F1~F5 finishing rolling) → hydrochloric acid continuous turbulent pickling → five-stand continuous rolling → full hydrogen bell annealing → tempering → recoiling.

The following takes the quality objection volume with volume number 6Y02421ZP0Q3 as an example to analyze and investigate the reasons for stamping cracking.

2.1 Check the chemical composition, physical properties and metallographic structure of the objection roll

2.1.1 Check the chemical composition

The chemical composition of the objection sample was tested, and the results are shown in Table 2. The test results are slightly different from the components in the quality assurance certificate, which are related to the sampling part and the inspection error. They all meet the requirements of the DC03 product internal control standard, which belong to the normal component control level, and there is no obvious abnormality.

2.1.2 Check physical properties

The physical properties of the objection samples were tested, and the results are shown in Table 3.

The physical property test results of the objection samples are slightly different from those in the warranty, which are related to the sampling location and inspection errors. The physical properties of the objection samples meet the requirements of the internal control standards. However, the n value in the physical performance index is not high, which affects the stamping performance.

2.1.3 Inspection of metallographic structure

Check the metallographic structure of the objection sample, the results are shown in Figure 1.

The microstructure is ferrite, and the grain size is II 6.0. The metallographic structure has the problem of coarse grains. Coarse grains are the main reason for the poor stamping performance of the steel strip.

2.2 Investigate the manufacturing process

In order to further analyze the causes of stamping cracking, the key process parameters of the key processes affecting stamping performance and metallographic structure in the manufacturing process were investigated. Mainly investigate the final rolling and coiling temperature of hot rolling, the temperature curve of hood retreat, and the temperature setting of hot and cold spots.

2.2.1 Investigate hot rolling finishing and coiling temperatures

In the hot rolling process, the final rolling temperature is set at 900°C, and the actual average is 902°C; the coiling temperature is set at 580°C, and the actual average is 586°C.

2.2.2 Investigate hood retreat temperature

The hood cooling point/hot spot temperature is set to 642/700°C, and the temperature curve is normal.

2.2.3 Investigation of cold rolling reduction ratio

Cold rolling reduction rate: the thickness of the hot-rolled raw material is 4.0mm, the cold-rolled finished product is 1.5mm, and the reduction rate is 62.5%.

2.3 Analyze the reasons

2.3.1 Cold rolling reduction rate is not high

Combined with the previously described 576.62 tons of stamping and cracking quality objections, the statistics of products greater than or equal to 1.5mm totaled 536.425 tons, and the proportion of thick specifications reached 536.425 tons.

93.0%. The low reduction ratio of cold rolling should be one of the common factors for stamping and cracking of products with thickness reduction.

2.3.2 Nitrogen composition control

Through analysis, it is found that most of the metallographic structures of the samples with different quality of stamping cracks show the phenomenon of coarse grains, and chain-like cementite also appears at the grain boundaries of the metallographic structure of individual products, and the content of abnormally precipitated cementite and nitrogen elements related to low. The nitrogen content is low, and the formation of AlN is less, which affects the texture formation effect in the masking process.

The DC03 product was originally designed without strict control requirements for nitrogen. Therefore, the low nitrogen content should be one of the factors for stamping cracking of the products with the thickness reduction specification.

3 Improvement measures

3.1 Optimizing the cold rolling process

By increasing the thickness of the raw material at the entrance of the acid continuous rolling process, optimizing the rolling process, prolonging the holding time of the hood, and improving the stability of the elongation rate in the flattening process, the stamping performance of the product with the thickness of the hood is optimized.

3.2 Strengthen the control of nitrogen content

Through the technological exploration of the smelting process, N is appropriately increased by enhancing the ladle stirring and bottom blowing time. The nitrogen composition is strictly controlled above 30ppm to ensure the stamping performance of SPHD.

4 Conclusion

In 2017, the first branch of the cold-rolled sheet factory had a total of 4 quality objections for stamping and cracking, totaling 26.865 tons, of which 14.58 tons were stamping cracking with thick gauges. Compared with 2016, the number of thick-gauge stamping and cracking was 536.425 tons, and the number dropped significantly. It can be seen from this comparison and statistics that the stamping and cracking problem of DC03 with thickness reduction specification has been significantly improved. The quality objection management department is the forefront of handling customer demands. Only by handling customer demands and continuously improving product quality can the company’s products continue to improve.

Sheet fabrication services for mild steel, high strength low alloy (HSLA) steel, cold/hot rolled steel, galvanized steel, stainless steel, aluminum, copper and brass. Capable of fabricating parts up to 12 ft. length and +/-0.001 in. tolerance. Various capabilities include contract manufacturing,custom stamping,edge rolling, forming,top laser cutting, roll bending and welding. Finishing and secondary services such as hardware installation, tapping, deburring, cleaning, heat treating, plating, anodizing and painting available. Sheet Metal Prototype and low to high volume production runs offered. Suitable for commercial/residential architectural, aluminum brake shape parts, wall Panel systems, brackets, general flashings, rails, call button plates and ship building component parts.

The Reason For Uneven Laser Engraving Effect

The Reason For Uneven Laser Engraving Effect


Laser radium engraving technology has gradually entered people’s daily life, such as mobile phone back shell patterns, light switches, plastic buttons in the central control of automobiles, and the fonts (patterns) in them may be realized by laser radium engraving technology. When laser engraving patterns, processors may often encounter such a question: “Why is the effect of laser engraving uneven?”There are several reasons for the uneven effect:

  • The level of the machine table is not adjusted properly, that is, the galvanometer lens or field lens lens is not parallel to the processing table;
  • Since the two are not level, the distance between the laser beam and the object to be processed will be inconsistent after passing through the field lens. Finally, the energy of the laser falling on the object to be processed will have inconsistent energy density, which will show the effect on the material. uneven.
  • The laser output spot is blocked, that is, after the laser beam passes through the galvanometer and the field mirror, the spot is missing and not round enough;
  • The laser output head, fixing fixture and galvanometer are not adjusted properly, which causes part of the light spot to be blocked when the laser passes through the galvanometer. evenly.
  • There is also a situation that the galvanometer deflection lens is damaged, and when the laser beam passes through the damaged area of ​​the lens, it cannot be reflected well. Therefore, the laser energy of the laser beam passing through the damaged area of ​​the lens is inconsistent with that of the non-damaged area of ​​the lens, and the final laser energy acting on the material is also different, so that the marking effect is uneven.
  • Use off-focus to mark a certain range of content;
  • Because each focusing lens (field lens) has a corresponding focal depth range, and the defocusing method will easily lead to a large-scale marking pattern, the edge is at the focal depth critical point or beyond the focal depth range, so it is easier to causing unevenness in the effect. Therefore, the method of off-focus marking must consider the problem of laser energy.
  • Thermal lens phenomenon;When the laser passes through the optical lens (refraction, reflection), it will cause the lens to heat up and cause slight deformation. This deformation will raise the focus of the laser and shorten the focal length. If the machine is fixed and the distance is adjusted to the focal point, after the laser is turned on for a period of time, the laser energy density acting on the material will change due to the thermal lens phenomenon, resulting in uneven marking effect. (For the thermal lens phenomenon, please refer to the previous WeChat article).
  • Material reasons, such as inconsistent film thickness on the material surface or changes in physical and chemical properties;
  • Materials are sensitive to laser energy. Usually under the same material, the laser energy reaches a certain material damage threshold. When the thickness of the material coating is different, or some other physical and chemical treatment processes are not uniform enough, it will also cause unevenness in the effect of laser marking.

How To Quickly Improve Their Operation Level For Novice CNC Machine Tools

How To Quickly Improve Their Operation Level For Novice Cnc Machine Tools


As far as the classification of many domestic operators who have just engaged in CNC machine tools is concerned, a large part of the operators are skilled workers who have previously engaged in the operation of general manual machine tools or semi-automatic machine tools. They are very familiar with machining, but the programming of CNC machine tools is Relatively unfamiliar; there are also students who have just graduated from mechanical colleges. They are familiar with machining knowledge, CNC machining and programming theory, but lack actual machining experience; there are also many operators who have never been exposed to machining and programming. Yes, then it is very difficult for them to learn the operation of CNC machine tools.

For these beginners of CNC machine tools, it is very important to master certain CNC machine tool operation skills. On the one hand, they can avoid machine tool collision accidents, resulting in machine tool damage; on the other hand, in a short period of time, they can quickly improve the operator’s CNC machine tool operating skills, be competent for their own work, and create economic benefits for the unit. This paper introduces some theoretical knowledge of the operation skills of CNC machine tools especially for these operators who are new to CNC machine tools, and hopes to have some reference significance for the operators of CNC machine tools who have just engaged in it.

First of all, the operator needs to have a comprehensive understanding of the CNC machine tool being operated. Understand the mechanical structure of the machine tool: to understand the mechanical structure of the machine tool; to master the axis distribution of the machine tool; moreover, to firmly grasp the positive and negative directions of each CNC axis of the machine tool; to master the function and use of each component of the machine tool, such as simple The principle and function of the pneumatic system, the working principle and function of the simple hydraulic system; in addition, it is necessary to master the working principle and function of each auxiliary unit of the machine tool, such as the work of the tool magazine, cooling unit, voltage regulator, electrical cabinet cooler, etc. The principle, function and use method, as well as the working principle, function and use method of each safety door lock of the machine tool.
Firmly grasp the function of each operation button of the machine tool: know how to execute the program; how to pause the program and check the machining status of the workpiece, resume the paused state and continue to execute the program, how to stop the program; how to change the program and then execute the program, and so on.

Understand what kind of operating system the machine tool you are operating; briefly understand the control principle and working method of the numerical control system; what working language the system uses, the software used for machine tool processing and the language used. If the operator does not know the language or the professional vocabulary of the language, then professional training is required. During the training, he needs to take notes carefully. What each word in the machine software means in Chinese must be memorized by rote. If you master it, you can use the machine tool correctly in the future. In addition, the operator also needs to learn and master the general operation alarm sentences during training, know what the Chinese mean, how to solve the problem, and how to eliminate false alarms. In addition, for operators, if they have the energy and ability, they can learn and master this language, which will be of great help to improve machine tool operation skills in the future.

Secondly, it is necessary to master the manual or automatic operation of controlling the CNC machine tool, and master the movement of each CNC axis of the machine tool. The operator must reach the state of practice makes perfect, then he can be able to retract freely in any situation; only in the event of a collision or failure, the operator can deal with the problem correctly and in a timely manner, and the operator can form a conditioned reflex , decisively take braking measures. In addition, the operator should be very familiar with the machining program of the CNC machine tool; what kind of process and operation, what kind of action the machine tool should have, must be very familiar with it. When the machine tool executes the program, you can know at the first time whether the machine tool is moving correctly and whether braking measures need to be taken. In addition, every novice operator has more or less fear in the early stage of operating the machine tool, fearing that the machine tool will collide with the knife and the machine. Then only after the operator has mastered the operation of CNC machine tools, can they overcome similar fears, and can learn to master higher CNC machine tool operation skills on this basis.

Third, it is necessary to master program editing, parameter compensation of each process and compensation of the diameter and length of the tool or grinding wheel. First of all, after training, master the programming language, programming method and compensation method of each parameter of the CNC machine tool you want to operate. Most advanced CNC machines are now equipped with PC workstations for programming or simulation. So beginners can first perform software editing and machine tool cutting simulation learning on the workstation. In the process of learning programming, don’t just focus on the simulation results, but more importantly, learn the process of simulation processing, understand what kind of tool or grinding wheel needs to be used for the processing of the workpiece, and what kind of motion path the CNC axis of the machine tool completes the cutting process; When executing a specific process, the position and direction of the movement of the relevant components in the machine tool; pay attention to the movement direction and cutting direction of each axis when executing the machining, including how to feed the tool and how to withdraw the tool. The fast forward speed and displacement of the step, and the speed and displacement of each step. When processing through simulation software, pay attention that all parameters must be input correctly during the simulation process, and do not input carelessly because of the simulation, which may result in incorrect simulation processing results; or cause collisions during actual processing in the future, or Parts scrapped. If the simulation software has the function of anti-collision test, then use this function to check the correctness of programming. In addition, the operator needs to pay special attention: the simulation processing is only a theoretical result, which does not mean that the machine tool will not collide during the actual cutting process, nor does it mean that qualified products can be processed. The purpose of simulation is to save programming time, improve the actual utilization of machine tools, and reduce debugging time when machining workpieces, but it does not represent actual parts processing. Completing the perfect workpiece machining is inseparable from the wisdom and sweat of CNC machine operators.

Fourth, the processing skills in the actual processing process, carefully prepare the work, first read the drawings, confirm the position of the workpiece to be processed, confirm the precision tolerance of the workpiece to be processed, and then edit the processing program. Prepare the workpieces and tools or grinding wheels needed in the processing, prepare all the testing instruments required in the processing, and prepare all the auxiliary tooling and fixtures required in the processing.

 


At Be-cu.com,we use advanced equipment to offer you Unparalleled precision for producing metal and plastic machining parts

  • We combine the latest CNC milling and turning processes with proprietary technology to deliver high quality, on-demand parts.
  • Our team of engineers and machinists program the equipment to optimize cutting time, surface finish, and final tolerance to meet your design specifications
  • We specialize in cnc precision machining, single part prototyping, short to medium production runs, manufacture parts on time, every time, so you can stay ahead of schedule
  • CNC machining can create very similar parts to series parts. It is often more efficient and faster than other rapid prototyping technologies for the manufacture of a quantity of prototypes between 1 and 10 parts . We also recommend CNC machining for parts with large sizes (greater than 600 mm).

Research On The Design Of Automatic Transmission For Electric Vehicles

Research On The Design Of Automatic Transmission For Electric Vehicles


introduction

Electric vehicles are powered by renewable and clean electric energy, which overcomes the problems of environmental pollution and resource shortage of traditional internal combustion engine vehicles; electric vehicle traction motors have a wider working range than traditional internal combustion engines, and the motor has constant torque at low speed and constant Power at high speed. The characteristics are more suitable for vehicle operation requirements. However, the fixed ratio reducer has only one gear, so that the electric vehicle motor is often in the low-efficiency area, which not only wastes precious battery energy and reduces the driving range, but also increases the requirements for the traction motor.

The electric vehicle traction motor must provide high instantaneous torque in the constant torque area and high operating speed in the constant power area in order to meet the vehicle performance requirements such as high speed, climbing and acceleration. In order to give full play to the advantages of electric vehicles and reduce the requirements for power batteries and traction motors of electric vehicles, the transmission system of electric vehicles should be multi-speed.

The complicated shifting operation of manual transmission and the need to cut off the power source during the shifting process affect the driving performance and comfort of electric vehicles. Automatic transmission is the development trend of vehicle transmission. Compared with manual transmission, automatic transmission has higher vehicle safety and comfort performance. The dual-clutch automatic transmission based on the parallel shaft manual transmission not only inherits many advantages such as high transmission efficiency, compact structure and low price of the manual transmission; The advantages of good shifting quality such as automatic transmissions. Therefore, electric vehicles with two-speed dual-clutch automatic transmission have better vehicle performance.

1. Structural principle of electric vehicle automatic transmission

1.1 System structure schematic diagram

Figure 1 shows the schematic diagram of the system structure of the two-speed dual-clutch automatic transmission. It is centered on the transmission electronic control unit and receives signals from sensors such as brake pedal, selector switch, accelerator pedal, etc., and can use CAN bus technology to receive signals from the whole system. Signals from the vehicle controller, such as vehicle speed, motor speed and other signals. The transmission electronic control unit collects the current road condition information, sends out signal commands through a certain shifting rule, and controls the clutch actuator to operate the clutch separation and combination.

1.2 The principle of transmission structure

According to the driving performance of the vehicle, it is determined that the ideal Ⅱ pure electric vehicle transmission design adopts a two-speed transmission to meet the power and economic requirements of the whole vehicle. Figure 2 is the transmission structure diagram of the two-speed dual-clutch automatic transmission. The output shaft of the clutch CL1 is a solid shaft, and a hollow shaft is sleeved outside the solid shaft, that is, the output shaft of the clutch CL2. The concentricity of the two output shafts makes the structure more compact. Through the motor and the deceleration and distance-increasing structure, the engagement and analysis of the two clutches realizes two-speed automatic transmission, and there is no need to add a shifting mechanism, which simplifies the structure of the system.

When the electric vehicle is stopped, the clutch CL1 and the clutch CL2 are both in the disengaged state, so no power is transmitted. When the electric vehicle starts, the automatic transmission electronic control unit controls the clutch CL1 motor to engage the clutch CL1. When the clutch CL1 is fully engaged, the electric vehicle enters the 1st gear. At this time, the clutch CL2 is still disengaged and does not transmit power. When the electric vehicle accelerates and reaches the shift speed value of 2nd gear, the clutch motor is controlled by the transmission electronic control unit so that the clutch CL1 starts to be disengaged, and the clutch CL2 starts to be engaged.

The two clutches are switched alternately until the clutch CL1 is completely disengaged and the clutch CL2 is fully engaged, and the electric vehicle upshifting process ends. When the electric vehicle enters the 2nd gear speed operation, the transmission electronic control unit collects relevant signals and judges whether the gear that the electric vehicle is about to run in is downshifted. The downshift process only needs to disengage the positive clutch CL2 and engage the disengaged clutch CL1 at the same time. Cooperate with the switching sequence of the two clutches, and shift according to a certain shifting pattern, and the entire shifting can be completed in an orderly manner.

1.3 Principle of control system

1.3.1 The hardware principle of the control system

The automatic transmission electronic control unit TCU is the control core of the entire dual-clutch automatic transmission system. The design of the TCU is directly related to the quality and performance of the entire dual-clutch automatic transmission. This design selects Freescale’s 16-bit MC9S12C64 microcontroller. MC9S12C64 has high-speed digital signal processing capability, strong real-time performance, low power consumption, and high integration performance. Its working environment temperature can be between -40 ~ 125, which can overcome the impact of the harsh working environment of the car on the performance of the single-chip microcomputer.

MC9S12C64 adopts 16-bit microprocessor S12CPU, which has high computing and processing capabilities. MC9S12C64 has 2KB internal RAM, 64KB internal FLASH; an 8-channel 16-bit TIM (timer) module, which has the ability to efficiently process multiple time events, and meets the multi-channel speed signal acquisition requirements in the automatic transmission control system of electric vehicles; 8 channels 10-bit AD (analog-to-digital conversion) module, which meets the requirements of multi-channel analog signal conversion accuracy; 6-channel 8-bit PWM (pulse width modulation) module, which can meet the multi-channel motor drive signal output requirements of electric vehicles; CAN bus module for communication. Other available resources: The 80-pin package has 60 general-purpose I/O ports, two 8-bit bidirectional digital I/O ports, an internal watchdog, and more.

Taking MC9S12C64 as the core TCU system is mainly composed of main controller module, input module, motor drive module, Display and CAN communication module. Signal input includes analog signal, switch signal and pulse signal input. Among them, the motor speed adopts a Hall pulse sensor, and the pulse signal output by the speed sensor is input to the pin of the single-chip microcomputer for speed measurement after photoelectric isolation and level conversion. The motor drive module uses PWM to control the speed and steering of the two clutch control motors. PWM has the advantages of high speed regulation accuracy, fast response speed, wide speed regulation range and low consumption.

The CAN communication module can transmit data between the TCU and the vehicle motor controller and anti-lock braking system, thus realizing the control of the motor speed and torque by the dual-clutch automatic transmission system, which not only simplifies the design, but also reduces the system manufacturing cost , while improving the integration and reliability of the TCU, improving the quality of shifting and the power and comfort of the vehicle. The display module adopts two digital tubes to display the gear position and fault code respectively. The fault alarm is realized by light-emitting diode and buzzer.

MC9S12C64 does not have internal EEPROM and clock, so it needs to add clock circuit and power-down memory. 

1.3.2 Software principle of conrol system software

The dual-clutch automatic transmission software system adopts the modular programming method, which is composed of main program, signal processing, shifting decision-making, execution and other modules. The main program is a cyclic program, which continuously reads the vehicle status by collecting signals, calls the corresponding subroutines for shifting decision-making, shifting and fault diagnosis according to the driver’s operation in real time, and displays the gear position and fault code. Call the police.

The main program of the TCU system consists of the power-on initialization subroutine, the parking gear processing subroutine, the neutral gear processing subroutine, the forward gear processing subroutine, the reverse gear processing subroutine, and the online fault diagnosis and display program. The power-on initialization subroutine is mainly to initialize the software operating environment. Subroutines such as parking gear processing subroutine, neutral gear processing subroutine, forward gear processing subroutine and reverse gear processing subroutine respectively form their own loops according to their respective gear processing characteristics and functions. The fault diagnosis and display function handles the abnormal or unhandled situation of the program, and displays the fault code. 

2. Advantages of automatic transmission for electric vehicles

According to the structural characteristics of pure electric vehicle two-speed dual-clutch automatic transmission, it has the following advantages:

(1) The structure is simple. The pure electric vehicle motor can steplessly adjust the speed within a certain range, so the transmission system can meet the dynamic performance and economy of the vehicle as long as it adopts two forward gears, and simplifies the transmission structure; Combination and separation control can meet the requirements of automatic transmission without shifting actuators.

(2) Cost saving. The dual-clutch automatic transmission has a good inheritance of the original automatic transmission production line, and the investment in technical transformation is low; the complex mechanism such as the hydraulic system has been cancelled, and the manufacturing cost has been reduced; the battery and motor of pure electric vehicles are relatively expensive, and the two-speed dual-clutch automatic transmission can be used. Save battery power and reduce motor performance requirements, thereby saving vehicle manufacturing costs.

(3) The shifting quality is high. The dual-clutch automatic transmission is simple in structure, stable in operation, does not cut off power during shifting, and has good shifting quality and transmission efficiency.

(4) Easy maintenance and low cost. There is no hydraulic system, and complex structures such as shift actuators are eliminated, reducing maintenance difficulty and costs.

3. Summary

Under the social background of energy saving and emission reduction, electric vehicles will have good development prospects. Limited by battery technology and vehicle motor technology, electric vehicles need to use and will still need to use more than two-speed transmissions for a period of time in the future to meet the power and economy of the whole vehicle. The two-speed dual-clutch automatic transmission for electric vehicles not only reduces the requirements of electric vehicles for batteries and motors, but also overcomes the problems of poor shifting quality of manual transmissions and the power source interruption of AMT shifting. Therefore, the two-speed dual-clutch automatic transmission has better performance. application prospects.

Sheet fabrication services for mild steel, high strength low alloy (HSLA) steel, cold/hot rolled steel, galvanized steel, stainless steel, aluminum, copper and brass. Capable of fabricating parts up to 12 ft. length and +/-0.001 in. tolerance. Various capabilities include contract manufacturing,custom stamping,edge rolling, forming,top laser cutting, roll bending and welding. Finishing and secondary services such as hardware installation, tapping, deburring, cleaning, heat treating, plating, anodizing and painting available. Sheet Metal Prototype and low to high volume production runs offered. Suitable for commercial/residential architectural, aluminum brake shape parts, wall Panel systems, brackets, general flashings, rails, call button plates and ship building component parts.

How To Process Carbon Fiber Sheet

How To Process Carbon Fiber Sheet


Carbon fiber sheet is a high-quality composite material. The molding method is to impregnate carbon fiber with resin , and then heat and solidify it in a mold. It inherits the superior performance of carbon fiber, light weight, high mechanical strength, corrosion resistance, high temperature resistance, small thermal expansion coefficient, and can be used in various harsh environments.

Regarding the production and machining of carbon fiber sheets, Be-cu carbon fiber selects imported resins and filaments. 100% pure carbon fiber and epoxy tree, coupled with advanced equipment and scientific management methods, make the product’s flatness, thickness tolerance, appearance effect, temperature resistance, resistance, stability, etc. meet customer requirements, and the quality is excellent. We have advanced machine tool equipment, Cnc full computer control machining, high precision. In addition to sheet machining parts, special-shaped parts can also be produced and processed with drawings or samples, and the mold fee and proofing fee will be refunded for large purchases.

Carbon fiber sheets are used in a wide range of fields, including national defense, electronics, sports equipment, musical instruments, medical equipment, and building reinforcement. With the progress of productivity, the scope of use is still further expanding, and I believe it will fully penetrate into life in the future.

Carbon fiber sheet machining comes from Be-cu carbon fiber. We have the leading technology in the country and have cooperated with many well-known universities. The products have passed UL, SGS and ISO9001: 2000 quality management system certification, and the market is all over the world. In the days to come, we will continue to make progress to meet the requirements of different customers with the best service. If you have any questions, please click the online customer service consultation on the webpage.

ISO 9001 certified. BE-CU Prototype Offering CNC machining carbon fiber and other manufacturing services for carbon fiber marterial. Various capabilities include notching, labeling, drilling carbon fiber, grinding, laser cutting carbon fiber, finishing, plating, marking, CNC milling carbon fiber and turning carbon fiber.We stock high quality 3k carbon fiber sheet in a variety of thickness, types and finish. Its a great material used in applications where light weight and strength are needed such as drones. Unlike other workshops, we have no min order and are often filling orders with a single part. We also don’t make you pay for the full sheet and you only get charged for what is used. With a large selection of material, you should find everything you need to make your project come to life. We are also able to handle larger production runs and provide a competitive pricing. If we don’t have the material or finish you require, we are more the willing to look at bringing it in for you.

What Is Carbon Fiber?Carbon fiber is made of polyacrylonitrile (PAN) (or pitch, viscose) and other organic fibers by carbonization (removal of most elements except carbon) by pyrolysis method under inert gas at high temperature above 1,000 °C. Inorganic polymer fibers with a carbon content of more than 90%.

Top 5 Advantages Of A CNC Machining Die Casting Parts Services

High Volume Manufacturing Parts test of your design is a must as it allows you to test your die casting product(as lighting die casting parts) and refine your ideas. That makes it an important aspect of the product development process. While it can be expensive and time-consuming, you have the option to outsource it to a reputable CNC Machining service. Thus, you can focus on other areas of your project and ensure the speedy and accurate creation of an aesthetic or functional model for your design.

During Precision Machining, your research and development team can identify and validate promising concepts based on the design samples. A prototype allows them to test the design’s core features with users to have a clearer idea of how the concept can meet the market demand. It also lets them make the necessary adjustments to the design before it goes into final production.

Here are more top advantages of CNC Machining die casting parts services:

Reduce product development expenses

The CNC Machining service eliminates the need to purchase your die casting molding material and manufacturing devices. This way, you can save time and money while ensuring that your final product can be realized faster and cost-effectively, with better ROI.

Avoid product failure

The service provider can ensure accurate and precise manufacturing of your CNC Machining samples based on your exact design. This way, product designers can identify any flaws and make corrections or improvements. Moreover, it ensures a more ergonomic way to identify and evaluate product hazards.

Functionality testing

The CNC Machining samples shows the exact function and aesthetics of your product.CNC Machining and Surface Treatment services will ensure speedy results so you can test and retest quickly and find ways to fine-tune your ideas.

Access to more technologies

A reputable rapid cnc prototype machining service offers a range of technologies and solutions to create functional or aesthetic products. These include Metal 3D printing, vacuum casting, injection molding, and CNC machining.

Make sound decisions

Established providers of cnc machining services in China can review your project for free. It’s a great chance to learn how they can help you, especially if you’re unsure which die casting methods are best for your design.