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

2023-02-14 09:14:09

Stamping parts are often used in daily life, and a large number of products such as instruments, household appliances, bicycles, office machinery, household utensils, etc. are stamping parts. How to reasonably formulate the stamping process?

1. When designing the structural shape of the parts of the metal automobile stamping parts, it is better to use the surface and its combination with simple and reasonable structure. At the same time, it is also necessary to minimize the number of machined surfaces and the processing area.

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 process and processing requirements of cutting, electroplating, cleaning and other processes after stamping.

3. Requirements for metal stamping formability For the forming process, in order to facilitate the stamping deformation and the improvement of the quality of the parts, the material should have good plasticity, small yield ratio, large plate thickness directivity coefficient, small plate plane directivity coefficient, and small ratio of yield strength to elastic modulus of the material. For the separation process, it is not necessary for the material to have good plasticity, but it should have certain plasticity. The better the plasticity of the material, the more difficult it is to separate.

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

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

6. The selection of stamping oil should meet the process 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 the method of cutting the remaining material around the stamping part. The main reason for turning over and twisting of punched parts is the impact of blanking force. During blanking, due to the existence of blanking gap, the material is stretched on one side of the female die and compressed on the side of the male die. When using the discharge plate, press the material with the discharge plate to prevent the material on the concave side from warping upwards. At this time, the stress condition of the material will change accordingly. With the increase of the pressing force of the discharge plate on it, the material on the side of the punch is stretched, while the material on the surface of the die is compressed. The overturning of stamping parts is caused by the material on the concave die surface being stretched. Therefore, during blanking, pressing and pressing the material is the key to prevent the blanking parts from turning over and twisting.