The quality of the surface of mold working parts is closely related to the wear resistance, fracture resistance, and adhesion resistance of the mold, which directly affects the service life of the mold, especially the surface roughness value has a significant impact on the mold life. If the surface roughness value is too large, stress concentration will occur during operation, and cracks are prone to occur between its peaks and valleys, affecting the durability of the punching die and the corrosion resistance of the workpiece surface, directly affecting the service life and accuracy of the punching die. Therefore, plastic mold manufacturers will pay attention to the following matters:

(1) During the machining process of mold working parts, it is necessary to prevent surface burns caused by grinding. The grinding process conditions and methods (such as grinding wheel hardness, particle size, coolant, feed rate, etc.) should be strictly controlled;

(2) During the processing of plastic molds, it is necessary to prevent macroscopic defects such as knife marks, interlayers, cracks, and impact marks on the surface of the working parts of the mold. The existence of these defects can cause stress concentration, become the root cause of fracture, and cause early failure of the mold;

(3) By using precision machining such as grinding, grinding, and polishing, a smaller surface roughness value can be obtained and the service life of the mold can be improved.