The reasons for wrinkling of precision hardware stamping parts are:

1. If there is too much lubricating oil or frequent brushing, lubricating oil should be used, but not too much; Furthermore, the brushing position is improper.

2. Insufficient edge pressing force, unsuitable gap between the pressing surfaces, and the problem of "loose inside and tight outside". The stamping direction of the workpiece is incorrect.

3. The trial punching blank is too soft, the material strength is low, and the blank size is too small to hold the material. The unstable positioning of the blank results in local inability to hold the material, improper shape of the pressing surface, and uneven material feeding.

The wrinkling phenomenon not only causes the workpiece to be scrapped, but also affects the cost of precision hardware stamping parts processing and raw material waste.

During the heat treatment process, precision stamping molds often undergo deformation. To prevent this negative phenomenon, it is necessary to grasp the deformation pattern, analyze the causes, and use different methods to prevent mold deformation, which can be reduced and controlled. Generally speaking, the following methods can be taken to prevent heat treatment deformation of precision and complex molds.

(1) Precision stamping parts are selected according to fairness. For precision and complex molds, micro deformation mold steel with good material quality (such as air quenched steel) should be selected. For mold steel with severe carbide segregation, fair casting should be carried out, and for larger and non castable mold steel, solid solution double refining heat treatment can be performed.

(2) The structural design of precision stamping parts molds should be fair, with no significant difference in thickness and symmetrical appearance. For molds with large deformation, the deformation pattern should be grasped and machining allowance should be reserved. For large and precision complex molds, composite structures can be used.

(3) Complex molds for precision stamping parts require pre heat treatment to eliminate residual stresses generated during mechanical processing.

(4) Reasonably choose the heating temperature and control the heating speed. For precision and complex molds, slow heating, preheating, and other balanced heating methods can be adopted to reduce mold heat treatment deformation.

(5) Under the condition of ensuring the hardness of the mold, try to use pre cooling, graded cooling and quenching, or warm quenching processes.

(6) For precision and complex molds, if possible, vacuum heating quenching and deep cooling treatment after quenching should be used as much as possible.