How do automobile stamping parts processing manufacturers check stamping parts?

1. Touch check: Wipe the outer surface of the cover with a clean gauze. Inspectors need to wear touch gloves and touch the surface of the metal stamping in the longitudinal direction. This inspection method depends on the inspector’s experience.

2. Oil inspection: A clean brush applies oil evenly to the entire outer surface of the metal stamping. Check oiled stampings under bright light. This way, small dimples, depressions and ripples on the stamped part can be easily found.

3. Flexible gauze polishing of metal stamping parts: Use flexible gauze to approach the outer surface of metal stamping parts in the longitudinal direction, and polish the entire surface, and it is easy to find any pitting and indentation.

4. Polishing with oil stone: first wipe the outer cover with a clean gauze, then polish with oil stone, and use a relatively small oil stone for arc areas and hard-to-reach areas. Special local areas can also be supplemented with lateral grinding.

5. Appearance inspection: It is mainly used to find abnormal appearance and macroscopic defects of stamping parts.

Today, the market competition of automotive metal stamping parts has entered a peak period. In order to win customers, many manufacturers put their energy into the price war, and even spare no effort to reduce the production cost without bottom line in order to win the price war. This marketing method will definitely be eliminated by the society. Even temporary volunteering will still not go far, and it will even bring unnecessary economic and reputation losses to future cooperation. Good quality control is the basis for the rapid development of stamping parts processing plants.

Continuous die stamping

Continuous die stamping is characterized by high batch production efficiency, easy automation, safe operation, long die life, reduction of equipment, die number and workshop area. . Now stamping parts manufacturers generally change from single punch to continuous die stamping. Today, we will give a brief introduction. Continuous die, also known as progressive die, refers to the punching die that can complete multiple processes at several different positions simultaneously in one stroke of the press. . That is, the processes of trimming, cutting, grooving, punching, plastic deformation and blanking can be completed in a pair of moulds. According to the actual needs of stamping parts, the manufacturer of stamping parts shall arrange multiple stamping processes in a certain order for continuous stamping. This also provides favorable conditions for high-speed automatic stamping.

The output and batch size of the processed parts must be large enough, otherwise it is not conducive to cost control. . The mechanical properties of stamping materials need to be relatively stable, and there are also high requirements for width and thickness tolerances and straightness of material edges. The press used shall have sufficient strength, stiffness, power, accuracy, large working surface and reliable braking system.

The main focus/point of the continuous die stamping process is strip steel, as strip steel is the core/core of the entire continuous die stamping process. Bar chart design involves the designer’s design ideas. It is necessary to know how many parts the strip steel consists of, such as material points, cutting positions, bending process, etc.

What are the types of processing shapes of stainless steel drawing parts?

Simply put, drawing is a stamping method in which a flat blank is formed into an open hollow part with a die. Thin-walled parts with irregular shapes such as cylindrical, rectangular, stepped, spherical, conical, and parabolic shapes can also be combined with other stamping processes to produce parts with more complex shapes.

According to the characteristics of deformation mechanics, stainless steel tensile parts can be divided into box-shaped parts (straight-wall non-rotating body), circular simple-shaped parts (straight-wall rotating body), surface-shaped parts (referring to curved surface rotating body) and non-rotating surface forming Components. It is characterized by:

First, the deformation characteristics of cylindrical parts.

In the deepening process, the deformation area is the blank flange edge, and the other parts are the force transmission area, which does not participate in the main deformation; under the action of tangential compressive stress and radial tensile stress, the blank deformation area produces tangential compression and radial tension. The deformation of the extension; the extreme deformation parameters are mainly limited by the bearing capacity of the blank force transmission area.

Second, the deformation characteristics of the box.

Its deformation properties are the same as for circular simplified parts. The difference is that the deformation that is always stretched and compressed is unevenly distributed around the blank, the rounded corners have large deformation, and the straight edge has small deformation; there is an interaction between large and small deformations around the blank.

3. Deformation characteristics of curved surface shape parts.

The periphery of the blank is the tensile deformation area that has been under compression, and the middle of the blank is the expansion deformation area of ​​bidirectional tensile stress.

4. Deformation characteristics of non-rotating body curved parts.

The deformation area of ​​deepening the blank is also composed of the outer deepening deformation area and the inner expansion deformation area, but the distribution of these two deformations around the blank is uneven; when the flange edge of the surface is partially deepened, the deformation area around the blank also has shearing deformed.

The above is the processing appearance type of stainless steel drawing parts. In the processing of drawing parts, quality is an important issue that cannot be ignored. No matter what type of drawn part, material, process and die are important factors that affect the deep drawing process. Hope the above content can be helpful to readers.

What are the factors that affect the processing quality of drawing parts?

Materials with good tensile properties can be reused if multiple die tests fail to meet the requirements. Where there is quality, there will be success. Usually 08 steel is produced, which is divided into boiling steel and killed steel. Its cost is relatively low, the surface quality is relatively good, but the segregation is serious, and there is a tendency to “strain aging”. It is not suitable for parts with high stamping performance and strict appearance requirements. Consistent performance, but more expensive.

In the process of deep drawing, the grinding of the drawing die and both sides of the blank holder is not enough, especially the deep drawing of stainless steel plate and aluminum plate, it is more likely to appear drawing marks, and sometimes serious tensile cracks will occur. No wrinkles, no scars. According to the principle that the area of ​​the blank is equal to the area of ​​the stretched part (plus trimming allowance), the correct positioning design of the blank should be carried out. However, the shape and process of drawing parts are often more complex, sometimes thinning and stretching. Although many 3D softwares are available for the calculation of spreading materials, their accuracy cannot meet the requirements.

We know that there is a hole in the middle of all the dies of the drawing die, such as circle, square, octagon, etc. Next, let’s take a look at the processing characteristics of the drawing die;

1. The gap between punch and die should be uniform. For drawing dies without guide equipment, a piece should be placed to adjust the correct installation direction of the punch and die. For the guide die, the gap between the punch and the die should be uniform during assembly.

2. The material has good sealing and elastic deformation during tensile deformation, so the punch and die need to be tested before hardening, which is easy to process and has good wear resistance. After the tensile test mold is qualified, the blanking mold is made according to the test modulus.

3. For the drawing die without guide equipment, it is necessary to place a piece to adjust the correct installation position of the punch and the die; when assembling the guide drawing die, it is necessary to ensure that the gap between the punch and the die is uniform.

4. Generally, when processing the drawing die, first make the drawing die, and then make the blanking die according to the condition of the test die, the processability of the parts and the convenience of the maintenance of the die, and the design should be considered carefully.

5. The processing quality of deep drawing dies has been paid more and more attention by people, and improving the quality of drawing dies is an important factor.

Tensile die process arrangement

1. Parts where the material is thinner and the drawing depth is greater than the diameter: the height can be increased by reducing the diameter of the cylinder, so that the fillet radius can be gradually reduced.

2. Parts with thicker material and closer drawing depth and diameter: If the height remains the same, the fillet radius can be reduced, and the cylinder diameter can be reduced at the same time.

3. When the drawing die is large and the radius of the circle is small, it can be achieved by multiple forming.

4. When the drawing die is too large, it can be formed by bulging as required.

When designing a drawing die, it is necessary to consider the relevant contents of the above-mentioned drawing part die design, such as tensile coefficient, material limit, determination of elasticity, drawing direction, pull-up or pull-down. , sometimes the mold is scrapped. Therefore, the production experience of the drawing die is also very important. I hope the above will be helpful to readers.

What are the assembly steps of the stamping die?

1. Assembly steps of stamping die

1. Select the assembly reference parts. When assembling, first select the datum part. The principle of selecting the reference parts is determined according to the dependence of the main parts of the mold in the processing process. The main components that can be used as assembly reference components are punch, die, punch, guide plate and fixed plate.

2. Component assembly. Component assembly refers to the assembly work in which the mold connects two or more components into a component according to the specified technical requirements before assembly. Such as mold base assembly, punch, die, fixed plate assembly, unloading, assembly of various components of the thrust mechanism, etc. These parts should be assembled according to the function of each part to ensure the assembly accuracy of the entire stamping die.

3. Overall assembly. Final assembly is the process of combining parts and components into a complete stamping die. Before final assembly, the assembly reference parts should be selected and the assembly sequence of the upper and lower molds should be arranged.

4. Adjust the gap between the convex and concave die. When assembling the mold, the uniformity of the punch and die gap must be strictly controlled and adjusted. After adjusting the clearance, tighten the screws and pins.

The methods of adjusting the gap between convex and concave molds mainly include light transmission method, measurement method, gasket method, coating method, copper plating method, etc.

5. Inspection and debugging. After the stamping die is assembled. The assembly accuracy must be guaranteed, the specified technical requirements must be met, and the function of each part of the mold must be checked according to the technical conditions for mold acceptance. Die tryouts are carried out under actual production conditions, and adjustments and corrections are made according to the parts produced by the die. After the mold test is qualified, the mold processing and assembly are basically completed.

Do you now have an understanding of the assembly steps of the stamping die? I hope this article helps you! We are a manufacturer of stamping dies, continuous stamping dies, metal stamping dies, continuous dies, school tool dies, etc. We are also a die manufacturer integrating design, production, processing, sales and service. You can contact us if necessary. !

What is the difference between large and small metal stamping parts?

“Hardware stamping parts” refers to metal parts produced by physical processing such as forging, rolling, cutting, etc. of various metals such as iron, steel, and aluminum.

“Large metal stamping parts manufacturing industry” refers to the general production equipment manufacturing from the mining and refining of metal materials to the manufacture of primary metal products, and then to the manufacture of special equipment for various industries in the national economy. The metal stamping parts industry mainly becomes products through the change, processing and assembly of the physical shape of metal raw materials.

Most metal stamping products are not final consumer goods. However, as ancillary products, semi-finished products and tools used in the production process of industrial manufacturing, “small metal stamping parts” is not an existing industry category, but a cross combination of the above-mentioned metal products – metal stamping products.

In the entire manufacturing industry, the responsibility of “small metal stamping parts” is to provide parts and production tools for manufacturing enterprises, not as end-use industry-specific equipment. Nevertheless, we cannot deny the important role of “small metal stamping parts” in the social production process: “small metal stamping parts” and the manufacturing industry are intertwined as an inseparable whole.

The trend of industrial concentration in the metal stamping industry is obvious. At present, the domestic metal stamping industry is mainly concentrated in Guangdong, Zhejiang, Jiangsu, Shanghai, Hebei, Shandong and other economically developed provinces. The products of traditional metal stamping enterprises are relatively simple, and many enterprises only provide supporting facilities and accessories for other manufacturing enterprises. They are highly dependent on manufacturing companies and are slow to respond to market demands.

Traditional metal stamping enterprises do not pay attention to the research and development of new products and the extension of the market, resulting in the lack of sustainable competitiveness of enterprises. In the face of increasingly specialized market demand and increasingly fierce competition, many metal stamping companies that have developed rapidly in the initial stage are feeling weak for the future.

What are the effects of materials on the processing of stamping parts?

1. Punching

Blanking stipulates that the raw material should have sufficient plasticity to ensure that the material does not crack during the blanking process. After punching soft materials, punching parts with smooth cross section and small slope can be obtained. The roughness of the cross section of the hard metal stamping material after punching is large, and the thick material is a ductile material, which is prone to tearing after punching.

2. Bending

The bending material should have sufficient plasticity and low strength limit; high plasticity sheet is not easy to crack when bending; materials with low strength limit and low elastic mold become less elastic after bending, and it is easy to obtain bending parts with accurate dimensions; for ductility Large metal stamping materials must have a large relative bending radius when bending, otherwise the material will easily crack during the entire bending process.

3. Stretching

The drawing process of the material not only stipulates that the drawing depth is as small as possible, the appearance is as simple and round as possible, but also that the material has good plasticity, otherwise it is easy to cause overall bending deformation, partial wrinkles, serious tensile cracking, etc.

Deep drawing

Deep drawing is a sheet metal forming process in which a sheet metal blank is radially drawn into a forming die by the mechanical action of a punch. It is thus a shape transformation process with material retention.

Characteristics of deep drawing

Deep drawing stamping offers many advantages over other metal forming processes. Punch presses are designed to operate at high speed and can be equipped with automatic feeders for increased efficiency. In fact, deep drawn stamping is one of the quickest manufacturing methods for high-volume production.Deep drawn components are also created in one piece, thereby reducing the need for additional assembly. This has the added benefit of seamless construction, which is ideal for waterproof or airtight applications.

Deep drawing stamping is highly versatile and can be used to create complex, detailed components with an exceptional degree of accuracy and repeatability. What’s more, deep-drawn parts are exceptionally strong due to the extreme amount of compression exerted on the metal during the forming process. The basic structure of deep drawn metals is often highly compressed into a very hard crystalline structure.

How to solve the problem of necking and pulling of stamping parts when processing aluminum alloy stamping parts of automobiles

Compared with steel parts, the forming process of aluminum parts is more prone to necking and cracking. There are two main reasons for this problem:

First, the stamping formability of the aluminum alloy sheet with the same plastic hardening index n value is much lower than that of the cold-rolled steel sheet. The thickness of the aluminum itself is lower than the anisotropy index, the deep drawability is large, the elongation after partial fracture is low, the forming window is narrow, and the forming capacity is only 1/3 of that of the steel.

Second, aluminum has the characteristics of timeliness. As the heat treatment time increases, the strength, hardness, plasticity and toughness of aluminum itself decrease. Generally speaking, it takes 6 months to produce aluminum coils after heat treatment. In the 6-month production window, the mechanical properties of different batches of aluminum before production vary greatly due to aging, and the difference between mold margin and material properties Poor matching, necking and splitting occur from time to time.

1. The shrinkage treatment plan of the stamping plant is as follows

1. Plate aging control

Aluminum sheet has aging properties, the strength increases with time, the hardness increases, and the plasticity decreases. Before stamping production, due to the different conditions such as the manufacturing process of the plate, the factory state after heat treatment, transportation, and temperature, the mechanical properties of the aluminum plate material before stamping production are quite different, which has a great impact on the production adjustment of the mold, and also leads to frequent production in continuous production. There are problems such as necking and pulling cracks. In order to solve this problem, we can first accumulate the range of mechanical properties for stable production of the mold, and then use the aging characteristics of aluminum to master the timeliness law, and stop using the aluminum with a low yield, so that it is naturally aged, and the yield strength is increased to After the expected range can be produced.

2. Early warning and intermittent supply of aluminum plate mechanical properties.

Renovate the board material card, and print all the board information on the material card, which is convenient for problems in the production process, and can quickly compare and analyze the performance of the material. In addition, the index data of performance problems in production is also summarized and summarized, and the performance early warning range of each aluminum alloy stamping part is formed, and the blue card material is used beyond the time range, which plays a role in early warning of defects.

3. Use digital methods such as Autoform and ATos to help optimize the pulling and cracking of the neck region.

The die set position is prone to necking, especially when the theoretical necking maximum point reported in the drawing simulation or exceeds the safety margin line (FLC), which can be optimized in digital software and equipment.

4. Intelligent grid monitoring system.

According to the experience, the position where the aluminum parts are prone to necking and fracture is summarized, and the mold margin monitoring is carried out on these parts. The main application is the grid strain analysis device (4×5 million pixel three-dimensional stereo camera), the hand-held camera shoots, and the specific situation of the grid strain in the monitoring area can be obtained. It takes about 1 hour from the shooting to the end of the computer operation. The advantage is that it is easy to operate , Fast and easy to calibrate. After the analysis report is output, it will prompt which location is safe and which location is risky. For risk points, mold maintenance personnel evaluate further optimization.

5. Develop equipment with special functions.

In the current stamping parts production equipment, the drawing lower air cushion can realize the function of segmental pressure. The cover plate is set with a small pressure in the early stage of forming, and then the air cushion pressure is set under the segment. The segmental pressure setting can effectively solve the cracking problem of deep-drawn aluminum alloy stampings.

The above is the relevant content of automobile aluminum alloy stamping parts processing. Any machining parts need different machining plans according to their materials and characteristics, and solve problems in a timely manner during the machining process. I hope the above will be helpful to readers.

What is the cause of the tensile die strain and what is the solution?

The cause of the injury

1. Between the workpiece and the mold

Adding a film such as PVC between the mold and the molding material can sometimes solve the problem of workpiece strain. For the production line, the film can be continuously provided by the mechanism. For the stamping equipment of periodic production, each workpiece needs to add a layer of film, which affects the production efficiency. This method is generally expensive and also produces a large amount of waste. For small batches of large workpieces Production is desirable.

2. Raw materials for forming workpieces

By surface treatment of the raw material, such as phosphating, spraying or other surface treatment, a non-metallic mold layer is formed on the surface of the material to be formed, which can greatly reduce or eliminate the strain of the workpiece. This method is often more expensive. high, and requires the addition of additional production equipment and increased production processes.

3. Mould

By changing the convex and concave ink materials of the mold or surface treatment of the convex and concave molds, the secondary properties of the contact between the finished material and the convex and concave molds are changed.

Second, the solution

1. There are many ways to solve the problem of surface strain of workpiece and mold convex and concave mold. For different situations, the application method needs to be selected according to the size of the workpiece and the load, the production batch, the type of processing material, etc.

2. Using cemented carbide as the mold material, the chemical vapor phase of the convex and concave surface of the mold is deposited. TD is usually a cladding treatment. TD coating treatment is cost-effective.

Well, the above is what is the solution to the cause of the stretching die strain? I hope the above content can help readers.

What affects the stability of stamping processing

What affects the stability of stamping? First of all, we need to know that this stability can be divided into process stability and production stability. The former guarantees the quality of stamping products, and the latter guarantees the production capacity of stamping manufacturers. It can be seen that both are very important. The factors affecting stability are summarized as follows.1. The performance of stamping materials, the fluctuation of thickness, the variation range of materials and other factors have a certain impact on the quality of metal stamping parts and the stability of stamping dies;

2. The selection of stamping die materials and the strength design of die structures are directly related to the stability of metal stamping parts;

3. The resistance of draw bead and the variation range of blank holder force play an important role in the quality stability of metal stamping parts during drawing.

4. The reasonable selection of lubricant will directly affect the stability of stamping and the service life of stamping die.

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Processing characteristics of metal stamping parts and sample processing of simple stamping dies

Metal stamping parts are very common in daily life, so the metal stamping processing industry has been widely used. Currently, there are more than ten hardware products and hundreds of products on the metal market. Mainly include: locks, tensioning, door and window hardware, home decoration hardware, HVAC hardware, architectural decoration hardware, tools, bathroom hardware, kitchen hardware, etc. But in the processing of metal stamping parts, some problems will inevitably be encountered, how to deal with and deal with? The following editors of Zhejiang Baifudu Electromechanical will take you to understand the processing characteristics of metal stamping parts and the simple processing of stamping mold samples!

Metal stamping parts rely on presses and dies to apply external forces to plates, steel bars, pipes and profiles to plastically deform or separate, so as to obtain the forming and processing methods of workpieces of desired shape and size. In the stamping process, if the quality of the section and the dimensional accuracy of the workpiece are high, it can be repaired or used directly after stamping. In the production process of precision stamping parts, in order to improve the stability of stamping parts, the number of processes must be increased.

Metal stamping products have a long manufacturing cycle, many processes, and many abnormal situations (involving rework, scrap, split, replenishment, replacement, buffer materials, etc.), and the production process requires tracking and cost analysis. In addition, during the production process, customers can insert orders in time according to market changes, which is unpredictable by hardware companies. Relying on manual management, of course, cannot meet the change requirements of customer orders. Only after the order is confirmed, can it be included in the management. Sometimes the order status changes, but there is no timely response, often in a hurry. This shows that how to start information construction has become the primary problem facing hardware enterprise decision makers.

As a highly isolated industry, metal stamping parts often encounter bottlenecks under traditional manual management in daily production. First of all, the market competition is fierce, and user needs are constantly changing. Many hardware companies mainly focus on small batches and medium batches, and the design and manufacturing process of products often change according to customer needs. Therefore, hardware companies need to develop a good production plan to improve the flexibility of production and enable it to adapt to the market. The author believes that the products of general hardware enterprises are produced according to orders (contracts), the product structure is complex, the parts are many, outsourced and self-made. In the production process, relying on traditional manual management to rationally optimize production, the workload of production management is very large. The information and data of the department cannot be shared in a unified standard and interface, and it is inevitable that the delivery time cannot be scientifically controlled, which affects the execution rate of the order.

Second, metal stamping parts manufacturers have many outsourcing factories, involving many outsourcing factories, using traditional manual management methods, how to track and control the product quality, price, reputation of the metal stamping factory, and how the purchasing department controls the advance quantity, Ensuring that production does not go wrong, does not cause inventory backlog, and ensures a more reasonable level of capital occupation is a headache for hardware companies.

In many cases, the number of operations of a bent part is mainly determined by the complexity of its structural shape, which is determined by the number of bending angles. If the bending radius of the curved part is smaller than the allowable value, an additional forming process is required. Similarly, the number of processes and material properties of the drawn part, the drawing height, the number of drawing steps, the drawing diameter, the material thickness and other conditions are also affected and need to be determined by drawing process calculations. If the corner radius of the drawn part is small, or there is a certain requirement for dimensional accuracy, another forming process needs to be added after drawing. According to this model, the number of processes to determine stamping parts should also meet the conditions of the company’s existing mold capacity and stamping equipment. The molding ability should ensure mold processing, and the requirements for assembly accuracy should be improved accordingly, otherwise the number of processes can only be increased. For simple blanking parts, single-pass stamping dies are used; on the contrary, due to the limitation of die structure or strength, the inner and outer contours of complex stamping dies should be divided into multiple parts, requiring multiple stamping processes.

Recently, after receiving quotations for metal stamping products, many customers suggest to make some simple stamping dies to make some samples for testing. For these customers, we recommend customers not to make simple molds from the beginning. Especially for the following reasons:

1. Stamping parts that basically meet the requirements of the drawings cannot be produced.

The customer wants to use a simple mold as a sample, but has not confirmed the product in the early stage, and wants to spend less mold cost to test the sample. However, dimensional accuracy cannot be guaranteed for products manufactured by simple molds, even if the customer cannot be sure of the dimensional failure caused by the product.

2. A simple die cannot guarantee the uniformity of stamping parts.

A simple die cannot guarantee that each die is the same, because a simple die often does not have accessories such as positioning and guide posts, and there will be different offsets for each punch, which leads customers to inspect the stamping parts. , no satisfactory results can be obtained.

3. Failure to mass-produce simple stamping dies will result in waste.

The simple-packed punching meme has a simple structure and low precision, and can only be mass-produced after the customer confirms the sample. This will cause a lot of waste.

In fact, if the customer does not confirm the stamping product in the later stage, there is basically no need to open a simple die for sample testing, and other processing techniques can be considered to achieve it. Most steels are stamped, and punching can be made by other methods with ribs, ribs, undulations, or flanging to increase stiffness.

The above is the relevant content of metal stamping parts processing. In short, processing products through stamping process has become an important means and development direction of modern industrial production. However, the disadvantages of stamping parts are high mold requirements, complex manufacturing, long cycle and high manufacturing cost, which limit small batch production. Therefore, most stamping parts are mass-produced, which also reflects the importance of molds. I hope it helps readers.

How to choose the tolerance of precision metal stamping parts

Dimensional tolerances of formed stampings: The formed stampings are divided into 10 precision grades, represented by FT1 to ft10, where ft represents the dimensional tolerance of the formed stampings, and the Arabic numerals indicate the tolerance level. Accuracy class reduced from FT1 to FT10.

The limit deviation of stamping parts: the stamping deviation of the hole size is 0, the upper deviation is the lower deviation plus the dimensional tolerance; the upper deviation of the shaft size is the basic deviation, the value is 0, and the lower deviation is the upper deviation minus the dimensional tolerance. The upper and lower deviations of hole center distance, hole edge distance, bend, stretch length and height are half the dimensional tolerance.

Tolerance is the range of dimensional variation. The lower the value, the lower the precision and the less difficult the processing; the lower the value, the higher the precision and the more difficult the processing. So what are the important considerations in production:

1. Bending angle: the angular size of the stamping part formed by bending.

2. Blanking angle: the angle dimension formed by blanking on the plane of the flat or forming part.

3. Blanking fillet radius: the linear dimension of the fillet radius of the stamping part, the parts processed by the separation process such as stamping and blanking.

4. Forming size: the angular size formed by the bending linear dimension of the stamping part processed by stretching and other processes.

5. Blanking size: the linear size of stamping parts, used for stamping, blanking and other separation processes.