What are the methods to prevent turning over and twisting of automobile stamping parts?
Compress the material. Improve the traditional mold design structure, open a material gap on the unloading plate (that is, when the mold is closed, the unloading plate and the concave die fit, and the gap between the unloading plate and the concave die where the material is accommodated is the material thickness t-0.03 ~0.05mm). It can make the movement of the stripper plate in stamping smooth, and the material can be compressed. For key forming parts, the stripper plate must be made into a block-type structure, so as to easily solve the wear (pressure) loss caused by the pressing part of the stripper plate caused by long-term stamping, and the defect that the material cannot be pressed. Use the stripper to hold down the material to prevent the material on the die side from warping upwards.
Reasonable arrangement of unloading sequence. In the progressive die, the arrangement of the blanking sequence may affect the forming accuracy of the stamping parts. For the blanking of small parts of automobile stamping parts, generally a larger area of blanking is arranged first, and then a smaller area of blanking is arranged to reduce the impact of blanking force on the forming of stamping parts.
A bevel or arc is trimmed at the end of the punch edge. This method can effectively reduce the buffering force. After the punching force is reduced, the tensile force on the material on the die side can be reduced, and the phenomenon of turning over and twisting the stamping parts can be avoided.
Pay attention to maintaining the sharpness of punching convex and concave die edges. If the punching edge is worn, the tensile stress on the material will increase, so that the stamping parts tend to be turned over and twisted, so maintenance work should be done to avoid the wear of the punching edge.
Enhanced pressure function. That is to increase the thickness of the pressing part of the unloading insert (the normal thickness of the unloading insert is H+0.03mm) to increase the pressure on the material on the die side, thereby preventing the stamping parts from turning over and distorting during punching.
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