How to solve the problem of turning over and twisting of automobile stamping parts in stamping process?

2019-05-31 10:42:14

Stamping parts are often used in daily life, such as instruments, household appliances, bicycles, office machinery, household utensils and many other products are stamping parts. Then how to reasonably formulate stamping parts processing technology?

1. When designing the structural shape of parts, metal automobile stamping parts should adopt simple and reasonable surface and its combination. At the same time, the number of machined surface and the processing area should be as small as possible.

2. The materials used for metal stamping parts should not only meet the technical requirements of product design, but also meet the requirements of stamping technology and the processing requirements of cutting, electroplating and cleaning after stamping.

3. The requirement of metal stamping formability for forming process, in order to improve stamping deformation and quality of parts, materials should have good plasticity, small yield strength ratio, large directivity coefficient of plate thickness, small directivity coefficient of plate plane, and small ratio of yield strength to elastic modulus. For the separation process, the material does not need to have good plasticity, but should have a certain plasticity, the better the plasticity of the material, the more difficult to separate.

4. Choosing a reasonable method to prepare the blank in mechanical manufacturing can directly use profiles, casting, forging, stamping and welding, etc. The choice of blank is related to the specific production technical conditions, which generally depends on the production batch, material properties and processing possibilities.

5. Provide appropriate manufacturing accuracy and processing costs for surface roughness parts. The processing cost of metal stamping parts will increase with the improvement of precision, so the surface roughness of metal stamping parts should be regulated according to the actual needs of the surface.

6. The selection of stamping oil should meet the technological requirements. The stamping oil with excellent performance can significantly improve the processing environment and improve the accuracy of the workpiece.

In the progressive die, the shape of the stamping part is formed by cutting the remaining material around the stamping part. The main reason of turning over and twisting is the influence of blanking force. In blanking, due to the existence of blanking clearance, the material is stretched on one side of the die and compressed on the side of the punch. When the discharging plate is used, the material is pressed by the discharging plate to prevent the material from warping upward on the side of the concave die. At this time, the stress state of the material will change accordingly. The material on the punch side is stretched and the material on the concave surface is compressed with the increase of the pressure on the discharging plate. The reversal of stamping parts is caused by the tension of the material on the surface of the die. Therefore, when blanking, pressing and pressing material is the key point to prevent the blanking parts from turning over and twisting.