5 key points to solve the design of metal stamping dies

Compared with traditional machine processing, stamping technology saves materials and costs and has high output, so its use is becoming more and more common. When designing a mold, the following 5 prominent issues must be solved to instantly make the product quality and appearance surpass similar products.

The punch wears too fast.

The gap between the molds is too small. Usually, the total gap between the molds is 15% to 25% of the material plate thickness. The centering of the convex and concave molds is not good, and the precision of the mold base, mold guide components, and turret inserts is not enough, which causes the parts to be processed in the mold to be unsmooth. The temperature of the punch is too high, mainly due to long-term uninterrupted production, which causes the punch to overheat due to mold stamping. The mold grinding method is not right, resulting in mold annealing and increased wear. When punching on one side of the part, such as step punching, punching angle or shearing, the lateral force of the aluminum alloy door and window accessories will cause the punch to lean to one side, and the gap on that side will decrease, causing severe wear of the mold. If the installation accuracy of the machine tool mold is not high, the punch may also deviate from the upper mold, causing damage to the punch and the concave mold.

Mold material problem

Mold material will cause waste rebound. The relevant factors are: 1. The sharpness of the mold edge. The larger the radius of the edge, the easier it is to cause waste rebound. 2. The mold input. The mold input of each upper position of the machine tool is certain. The mold is large and the modulus is small, which is easy to cause waste rebound. 3. The gap of the mold needs to be reasonable. If the mold gap is not appropriate, it is easy to cause waste rebound. 4. Is there a lot of oil on the surface of the processed plate? 5. The original spring is damaged.

Methods to prevent the mold from carrying material: 1. Use a special anti-carrying die. Aluminum alloy door and window accessories 2. Grind the mold regularly to keep it sharp and demagnetize it. 3. Increase the gap between the die and the mold. 4. Use an oblique-edged mold instead of a flat-edged mold. 5. Install a material stripper on the mold. 6. Appropriately increase the mold entry amount. 7. Check the wear of the mold spring or unloading sleeve.

Mold alignment

During use, the mold is prone to different wear amounts on each side of the punch. Some parts have large scratches and wear faster. This is particularly noticeable on narrow rectangular molds. The main reasons for this problem are: 1. The design or processing accuracy of the machine tool turret is not enough. The main reason is that the alignment of the mold mounting seat between the upper and lower turntables is not good. 2. The design or mounting accuracy of the mold cannot meet the requirements. 3. The accuracy of the guide sleeve of the mold punch is not enough. 4. The mold gap selection is not appropriate. 5. The mold mounting seat or mold guide sleeve has poor alignment due to long-term wear.

To prevent mold wear and tear, you should: 1. Regularly maintain the centering core rod to check and adjust the centering of the machine tool turret and the mounting seat. 2. Replace the mold guide sleeve in time and choose a convex and concave mold with appropriate clearance. 3. Use a full-lead mold. 4. Enhance the operator's sense of responsibility and find the cause in time after discovery to avoid a bigger accident.

Special forming mold application

In order to meet production needs, forming molds or special molds are often needed, mainly bridge molds, shutter molds, countersunk molds, tapping molds, boss molds, stretching molds, combined molds, etc. The use of special or forming molds can help us improve production output, but the price of forming molds is relatively high, generally 4-5 times that of ordinary molds. To avoid mistakes, the following regulations should be noted and followed: 1. Check the direction when installing the mold to ensure that the installation direction of the convex and concave molds is consistent. 2. Accurately adjust the stamping depth of the mold according to requirements, and each adjustment should not exceed 0.15mm. 3. Use a lower punching speed. 4. The sheet should be flat without deformation or warping. 5. The forming process should be placed downward and should be kept as far away from the clamp as possible. 6. When using the forming mold, avoid downward forming operations: 7. When stamping, follow the ordinary mold first and then use the forming mold.

Mold spring fatigue

A problem that is easily overlooked is the use of punch molds. Aluminum alloy door and window accessories are sufficient to extend the service life of mold springs. Mold springs also need to be maintained or replaced regularly. However, many domestic users can maintain equipment and molds but often ignore the maintenance of mold springs. Some users have not replaced springs for many years. The same workstation or mold often appears damaged or stamping material, but the cause cannot be found. After replacing the mold spring, the problem is thoroughly solved. For different punch equipment and molds, the mold springs are also different. If the maintenance is not proper, mold material is likely to occur and the mold or guide sleeve may be damaged, resulting in unnecessary losses.