The service life of cold stamping die in Dongguan CNC processing factory is calculated by the number of workpiece produced. There are many factors that affect the life of cold die. The main factors are the design of die structure, the materials of punch and die used in the manufacturing of die, the heat treatment quality and surface strengthening of the die, the manufacturing precision of the stamping parts and the selection of cold stamping materials. In addition, there are also the installation, adjustment, use and maintenance of the die.
1. influence of die design on life
(1) The influence of layout design and the value of the edge on die life is very important. Too small value of the edge laying is often the important reason for sharp wear and convex and concave die gnawing. From the point of saving materials, the smaller the value of the edge is, the better, but the lower the value of the edge, it is not good for the die life and the quality of the shear surface. Dongguan CNC processing plant may be pulled into the gap of the die in the blanking process, which can cause burr of parts, even damage the edge of the mold, and reduce the die life. Therefore, when considering the improvement of material utilization, the layout method and the value of the edge overlap must be determined according to the production, quality and life of the parts.
(2) The influence of the concave structure on the die structure which is easy to produce stress concentration and crack can be combined or assembled, and prestressed structure, so as to improve the service life of the die.
(3) : when the clearance is too small, the compression and extrusion interests, friction increases, wear increases, and the side wear is intensified. When unloading and pushing parts after blanking, friction between materials and convex and concave die will also cause the wear of the side of the edge greater than that of the end face, and it is also easy to cause the high temperature of the convex and concave die, and the metal debris is adsorbed on the side of the edge to form metal nodules, The edge collapse or expansion of convex and concave die are caused. Therefore, too small clearance is very unfavorable for die life. Too large gap will increase the concentrated stress on the end edge of the punch and the concave die, which will cause the pressure stress to increase sharply, so the edge of the edge will yield and deform quickly and lose the corner. Therefore, the punching force is increased, and the edge of the edge is worn faster and the die life is reduced. But in order to reduce the wear of the convex and concave die and prolong the service life of the die, it is necessary to adopt the large gap properly in the design on the premise of ensuring the quality of the blanking parts<< Dongguan CNC processing factory deserves attention > >
(4) The influence of die guiding structure on life is very effective for reducing the wear of working parts and avoiding the gnawing of convex and concave die. Especially, it is more important for blanking die, compound die and multi station progressive die without or small gap. In order to improve the die life, the guide form and precision must be selected correctly according to the requirements of the process and the precision of the parts. The selected guide precision should be higher than the matching precision of the convex and concave die<< Dongguan CNC processing factory deserves attention > >