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What are the reasons for the surface quality problems of automotive stamping products?

What are the reasons for the surface quality problems of automotive stamping products?


According to the actual situation of the site, by inspecting the tearing position, fracture shape and degree of crushing of the part, it is believed that the tearing and skewing behavior of the part is mainly reflected in the flanging forming process. The reasons for this process are as follows:


  1. The forming process parameters of automobile stamping parts are not in place. In the forming process of the parts, the process requires the die, the press core and the boxu of the two parts to be closely attached to each other, and the plastic deformation of the sheet is forced when the machine tool slides down. And to achieve shaping. However, due to the shortcomings of the pressed parts such as unstable quality, it shows that the pressure of the machine tool is in a state of unbalanced pressure fluctuation during the production process. The main reason is that the processing technicians did not accept the process designation requirements to adjust the pressure of the machine tool in time at this stage, or that the machine pressure stability information was not communicated with each other during the handover of each shift, resulting in poor product quality. stability.



⒉. Flanging forming mold design defect. This mold is shared for the left and right parts of a mold with two cavities. Because the content of this process is not only the flanging, but also the shape forming content. In addition, the part is particularly complex, the curved surface is narrow, and the forming requires concave molding. The conformity of the core and the forming surface, etc., leads to a large forming stroke and a small pressing area of the mold structure condition. In the initial mold design, the designer only considered the feature of small blanking surface, but ignored the forming guide stroke of the blanking core.


There are many reasons for the surface quality problems of hardware automotive stamping parts. The surface quality of coils, sheets, and molds will affect the quality of the final stamping parts. The operation during the stamping process and the clamping and removal of station equipment are also


It may damage the surface quality of the part. Therefore, in each link of the entire manufacturing process, details should be fully considered to avoid quality problems that affect the final product appearance.


In the progressive die, the stamping part is formed by punching the leftover material around the stamping part to form the shape of the punching part. The main reason for the blanking and distortion of punching parts is the influence of punching force. When punching, due to the existence of the blanking gap, the material is stretched (the material material is warped upwards) in the concave mold, and compressed by the convex mold. When the unloading board is used, the unloading board is used to compress the material to prevent the material of the concave mold view from warping upwards. At this time, the force status of the material changes accordingly. Immediately, the pressing force of the material board against it increases, the material seen by the punch is stretched (compression force tends to decrease), and the material on the concave die surface is compressed (tension force tends to decrease). The overturning of the stamping part is caused by the stretching of the material on the die surface.


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