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What are the selection techniques for stamping materials?

ouzhong — Wed, 06 Dec 2023 00:37:27 +0000

What are the selection techniques for stamping materials? Today, European and Chinese automotive molds will tell you
Stamping processing includes processes such as punching, bending, deep drawing, forming, and finishing. The materials used for stamping processing are mainly hot-rolled or cold-rolled (mainly cold-rolled) metal sheet and strip materials, such as carbon steel plate, galvanized plate, tinplate, copper and copper alloy plate, aluminum and aluminum alloy plate, etc.
Due to the fact that the operation of the spring-loaded unloading mold is more convenient than that of a fixed unloading mold, the operator can see the feeding action of the strip in the mold, and the spring-loaded unloading plate applies a flexible force to the strip during unloading, which will not damage the surface of the workpiece. Therefore, in actual design, it is recommended to use a spring-loaded unloading plate as much as possible, and only when the unloading force of the spring-loaded unloading plate is insufficient, a fixed unloading plate is used instead. Whether the mold used for stamping parts adopts a spring-loaded discharge plate or a fixed discharge plate depends on the size of the discharge force, with material thickness being the main consideration factor.
The main purpose of hardness testing for stamping materials is to determine whether the annealing degree of the purchased metal sheet is suitable for the subsequent stamping processing. Different types of stamping processing processes require different hardness levels of sheets. Aluminum alloy plates used for stamping parts can be tested using a Vickers hardness tester. When the material thickness is greater than 13mm, a Babbitt hardness tester can be used. Pure aluminum plates or low hardness aluminum alloy plates should use a Babbitt hardness tester.

Design Points for Continuous Mold Manufacturing

ouzhong — Wed, 06 Dec 2023 00:35:07 +0000

Sharing an article with everyone about continuous mold manufacturing design is mainly about connecting stamped products to the strip, and sending semi-finished products to various engineering stations for stamping through equidistant feeding. There are many ways to connect stamped products to the strip, and continuous mold manufacturers introduce that the connection method also needs to be determined based on the characteristics of stamped products and stamping direction. Continuous mold manufacturing mainly involves conveying semi-finished products with additional materials, so the material utilization rate of continuous molds may be lower than that of engineering molds, but the production efficiency is much higher than that of engineering molds.
1. Stamped products detach from the strip and drop directly: the finished product is directly punched down at the end of the stamping die, and the stamped product is separated from the strip. This type of stamping product is directly stamped, and vibration grinding and cleaning are semi-finished products. This design is widely used in motor terminals, hardware parts, LCD parts, hard drive components, and other similar applications.
2. Stamped products are still attached to the material belt: Stamped products are connected to the material belt and leave the mold together. Stamped products are connected to the material belt, and there is a receiving machine behind the stamping mold to collect the stamped products connected to the material belt using a fixture. This type of stamped product generally requires post-processing such as electroplating, threading, etc., so it needs to be connected to the strip for other processes. This approach is mostly applied to terminal products.
3. Stamped products are attached to the strip, but can be peeled off directly by hand: Stamped products are connected to the strip and leave the mold, while stamped products are connected to the strip. The difference from terminals is that they can be peeled off by hand. This type of product also needs to undergo post-processing treatments such as electroplating, so it is necessary to connect the stamped product to the strip. During assembly, only the stamped product needs to be manually peeled off from the strip or other fixtures, simple molds, etc. After being assembled with the plastic part, it is peeled off to form a semi-finished product. This method is generally used for materials such as shrapnel, USB connectors, and connector shells.

What steel is used for stamping molds

ouzhong — Wed, 06 Dec 2023 00:32:54 +0000

The materials used for stamping molds include steel, hard alloys, steel bonded hard alloys, zinc based alloys, low melting point alloys, aluminum bronze, polymer materials, and so on.
At present, the majority of materials used for manufacturing stamping molds are steel. The commonly used types of mold working parts materials include: carbon tool steel, low alloy tool steel, high carbon high chromium or medium chromium tool steel, medium carbon alloy steel, high-speed steel, matrix steel, as well as hard alloys, steel bonded hard alloys, and so on.
1. Carbon tool steel
Carbon tool steels commonly used in molds are T8A, T10A, etc., which have the advantages of good processing performance and low cost. But the hardenability and red hardness are poor, the heat treatment deformation is large, and the bearing capacity is low.
2. Low alloy tool steel
Low alloy tool steel is made by adding an appropriate amount of alloying elements on the basis of carbon tool steel. Compared with carbon tool steel, it reduces quenching deformation and cracking tendency, improves the hardenability of the steel, and also has better wear resistance. Low alloy steels used for mold manufacturing include CrWMn, 9Mn2V, 7CrSiMnMoV (code CH-1), 6CrNiSiMnMoV (code GD), etc.
3. High carbon and high chromium tool steel
The commonly used high carbon and high chromium tool steels include Cr12, Cr12MoV, and Cr12Mo1V1 (code D2), which have good hardenability, hardenability, and wear resistance. They have minimal heat treatment deformation and are high wear-resistant micro deformation mold steels, with a load-bearing capacity second only to high-speed steel. However, severe segregation of carbides requires repeated upsetting and drawing (axial and radial) to reduce the unevenness of carbides and improve their performance.
4. High carbon medium chromium tool steel
High carbon medium chromium tool steels used for molds include Cr4W2MoV, Cr6WV, Cr5MoV, etc. They have low chromium content, fewer eutectic carbides, uniform distribution of carbides, small heat treatment deformation, good hardenability and dimensional stability. Compared with high carbon and high chromium steel with relatively severe carbide segregation, the performance has been improved.
5. High speed steel
High speed steel has the highest hardness, wear resistance, and compressive strength among mold steels, and has a high load-bearing capacity. Commonly used in molds are W18Cr4V (code 8-4-1) and W6Mo5 Cr4V2 (code 6-5-4-2, US grade M2) with low tungsten content, as well as the low-carbon and vanadium reducing high-speed steel 6W6Mo5 Cr4V (code 6W6 or low-carbon M2) developed to improve toughness. High speed steel also needs to be forged to improve its carbide distribution.
6. Matrix steel
Add a small amount of other elements to the basic composition of high-speed steel, and appropriately increase or decrease the carbon content to improve the performance of the steel. This type of steel is collectively referred to as base steel. They not only have the characteristics of high-speed steel, but also have certain wear resistance and hardness, and their fatigue strength and toughness are better than those of high-speed steel. They are high-strength and toughness cold work mold steel, but their material cost is lower than that of high-speed steel. The commonly used matrix steels in molds include 6Cr4W3Mo2VNb (code 65Nb), 7Cr7Mo2V2Si (code LD), 5Cr4Mo3SiMnVAL (code 012AL), etc.
7. Hard alloys and steel bonded hard alloys
Hard alloy has higher hardness and wear resistance than any other type of mold steel, but poor bending strength and toughness. The hard alloy used for molds is tungsten cobalt type. For molds with low impact resistance and high wear resistance requirements, hard alloys with lower cobalt content can be selected. For molds with high impact, hard alloys with higher cobalt content can be selected.
Steel bonded hard alloy is made by sintering iron powder with a small amount of alloy element powder (such as chromium, molybdenum, tungsten, vanadium, etc.) as the binder, titanium carbide or tungsten carbide as the hard phase, using powder metallurgy method. The matrix of steel bonded hard alloy is steel, which overcomes the disadvantages of poor toughness and processing difficulties of hard alloy. It can be cut, welded, forged, and heat treated. Steel bonded hard alloys contain a large amount of carbides. Although their hardness and wear resistance are lower than those of hard alloys, they are still higher than other types of steel. After quenching and tempering, their hardness can reach 68-73HRC.

Four maintenance precautions for continuous metal stamping dies

ouzhong — Tue, 05 Dec 2023 09:29:34 +0000

1. Maintenance and upkeep of convex and concave molds.
When disassembling convex and concave molds, attention should be paid to the initial condition of the mold, which is beneficial for the repair of subsequent molds; If there are washers or offsets, the thickness of the washers should be engraved on the parts and noted.
When disassembling and replacing the convex mold, check whether the concave mold of the material removal block is smooth, and whether the gap between the trial insertion and the concave mold is uniform; When disassembling and replacing the concave mold, is the gap between the trial insertion and the punching needle uniform.
In order to better reduce the reduction of protrusions, it is necessary to lift the gasket to achieve the required length, and it should be checked whether the reasonable length of the protrusions is sufficient. Replace the cracked convex mold, investigate the cause, and check if the opposite concave mold has collapsed edges and if cutting edges is necessary.
When assembling the convex mold, check if the gap between the convex mold and the fixed fixed block or fixed plate is sufficient. If there is steel cutting, check if there is thematic activity capacity. The assembled concave mold should be placed horizontally, then a flat steel block should be placed on the surface of the concave mold, and lightly tapped with an aluminum rod in a timely manner. There is no need to tilt or strike forcefully. The bottom of the concave mold should be rounded. After installation, check if the concave mold surface is flush with the mold surface.
After assembling the convex and concave molds and mold cores, it is necessary to check the medical belt, whether each component is installed incorrectly or in the opposite direction, whether the concave mold and concave mold gasket are installed in the opposite direction, whether the feeding hole is blocked, whether new parts must be stolen, whether they are sufficient, and whether the mold must be tightened.
Pay attention to ensuring that the screws on the discharge plate are securely fastened. When locking, the force should be evenly applied from the inside out and clamped in a cross pattern. It is not necessary to lock one screw first, and then lock another screw to prevent the stripping plate from tilting, causing the convex mold to break or the mold accuracy to decrease.
2. Maintenance of the discharge plate.
When disassembling the stripper board, you can use two drivers to evenly smash it open, and then use both hands to balance the bar and remove it. When it is difficult to disassemble and assemble, check whether the mold is clean and tidy, whether the clamping screws are all disassembled and assembled, and whether the mold caused by the clamping material is damaged. After identifying the cause, carry out corresponding solutions, and do not blindly follow the trend to solve the problem.
When assembling the stripper board, first clean the convex mold and stripper board, add lubricating grease between the positioning pin and the convex mold guide, and successfully insert them. Then, press them in time with both hands and repeat several times. If it is too tight, the cause should be investigated (whether the positioning pin and guide pillar are all normal, whether each component is damaged, whether the new punch can pass through the stripper plate, and whether the position is appropriate), and then the corresponding solution should be completed.
If there is steel cutting on the fixed fixed plate, check if the seat on the side plate of the material removal is sufficient. The contact area between the stripper plate and the raw material in the concave mold is caused by long-term stamping and processing, resulting in imprinting. When the indentation is severe, it will affect the control accuracy of the raw materials, causing abnormal and unstable product specifications. The discharge plate and discharge plate must be repaired or ground again.
The specifications of the contour sleeve should be checked for accuracy. Different heights can cause the stripping plate to tilt, and its accuracy guidance and stable elastic compression will be damaged. It is necessary to maintain and maintain it.
3. Adjustment of mold clearance.
The positioning hole of the mold core is damaged due to damage to the mold core, resulting in excessive gap (loose after assembly) or uneven gap (positioning error) after assembly, resulting in poor cross-sectional appearance, easy breakage of the convex mold, burrs, etc. after laser cutting. Proper gap adjustment can be carried out based on the inspection of the cross-sectional situation after laser cutting.
When the gap is small, the cross-section is small, but when the gap is large, the cross-section is large and the burrs are large. Effective gaps can be obtained by moving. After adjustment, record as much as possible or at the edge of the concave mold for easy maintenance and practical operation.
In daily production and manufacturing, attention should be paid to collecting and storing the material strips of the original molds. If the subsequent work is unsuccessful or there is a genetic mutation in the mold, it can be used as a reference for mold maintenance and upkeep.
In addition, if the auxiliary system software such as the top material pin is damaged, can it be used to top the material, and if the guide pins and shaft sleeves are damaged, regular inspection and maintenance should be paid attention to.
4. Check the directional position.
It is necessary to check the clearance between the positioning pins and guide pillars, whether there are any burns or damage marks, and whether the oil supply for the mold’s guidance is normal.
The damage and precision degradation of directional components reduce the accuracy of the mold, and every part of the mold will have problems. It is necessary to carry out appropriate maintenance and regular replacement. Check the accuracy of electrical conductor components. If the guide pin is damaged, it is necessary to replace the accuracy and function of the electrical conductor. Check the condition of the detachment torsion spring and the top material spring to see if they are broken or have been used for a long time. Although it did not rupture, it was already tired and lost its original compressive strength. Be sure to maintain and replace the mold, otherwise it may cause damage or poor manufacturing.
In the production and manufacturing of stamping molds, everyone’s mold staff must be meticulous and careful to improve the service life of the molds, increase productivity, and save costs for the mold company.

遮天 辰东 小说,听中国有声小说,小说阅读网站

What are the selection techniques for stamping materials?

Design Points for Continuous Mold Manufacturing

What steel is used for stamping molds

Four maintenance precautions for continuous metal stamping dies

遮天辰东小说,听中国有声小说,小说阅读网站