The service life of the cold stamping die is relatively short. The reason is that there are many forms and reasons that affect the service life of the cold stamping die. Among them, the main ones are fracture, deformation, wear, and gnawing. The following is the specific situation:
fracture
The convex and concave molds of cold stamping die are suddenly damaged, broken and cracked during use. Since the convex and concave molds of the mold are the parts that bear the greatest pressing force during the stamping work, the convex and concave molds of the mold will break during the stamping process. The main reason is: improper heat treatment processing (excessive quenching) Or the hardness layer is too deep), the design gap is too small, etc. will cause mold convex, concave mold breakage, breakage and fracture. The breakage of the convex and concave molds of the mold is partially damaged. We can continue to use it after repairing. Others are broken or completely damaged and cannot be repaired. We have to configure a new punch or die according to the design of the drawing. Use after the die.
Deformation
The convex and concave molds of the cold stamping die deformed during use, which changed the geometry of the processed product parts, which in turn affected the dimensional accuracy and shape requirements of the processed parts. This is the opposite of the fracture situation, mainly because the convex and concave molds have insufficient quenching hardness during the heat treatment process or the quenched hardness layer is too shallow, which makes the convex and concave molds geometrically deformed during the stress process.
Wear
The protruding and concave molds of the cold stamping die and the material to be processed frequently rub against each other for a long time, causing wear. Because the convex and concave molds rub against each other for a long time with the material to be processed, large quantities of long-term blanking process parts, too large burrs (too large gap), too small convex and concave gaps, etc., are all caused An important reason for the wear of the knife edge of the convex and concave molds. Such as convex and concave die blades become blunt, the edges and corners become round and so on.
Gnaw
The gap adjustment and assembly of the convex and concave molds of the cold stamping die is uneven, and the adjacent edges of the convex and concave molds bite each other, causing the convex and concave die edge to bite. For example, in the mold assembly process, the position of the convex and concave molds is offset and the gap is uneven. When the mold without guide is installed, the gap between the convex and concave molds is not adjusted properly, and the convex and concave molds may bite and damage each other.