The forms and reasons that affect the service life of cold stamping dies are many and varied, among which the main ones are fracture, deformation, abrasion and biting.
The following is the specific situation:
fracture
During the use of cold stamping die convex and concave dies, sudden damage, breakage and cracks appear in the process. Because the convex and concave molds of the mold are the parts of the mold that are subjected to the pressing force during the stamping work, the convex and concave molds of the mold will break during the stamping process. The main reasons are: improper heat treatment processing (hardening or hardness is too hard The layer is too deep), too small design gap, etc. will cause the mold convex, concave mold damage, breakage and fracture. The fracture of the convex and concave molds of the mold, some are local damage, we can continue to use it after repair, and some are damaged to a large extent or completely damaged and cannot be repaired, and we must configure a new convex mold or Use after the die.
Deformation
The cold stamping mold convex and concave molds have undergone shape deformation during use, which changes the geometric shape of the processed product parts, which in turn affects the dimensional accuracy and shape requirements of the processed parts. This is just the opposite of the fracture situation, mainly because the quenching hardness of the convex and concave molds during heat treatment is not enough or the quenching hardness layer is too shallow, which causes the geometric deformation of the convex and concave molds during the stress process.
abrasion
The cold stamping die convex, concave die and the processed material frequently rub against each other for a long time, resulting in wear. Due to the prolonged friction between the convex and concave molds and the processed material, large quantities of long-time punching parts, the burrs of the punching parts are too large (the gap is too large), the convex and concave gaps are too small, etc. An important reason for the wear of the knife edge of the male and female molds. Such as convex and concave die blades become blunt, edges and corners become round and so on.
Gnawing
Cold stamping die convex and concave die gap adjustment and assembly are uneven, adjacent edges of convex and concave die bite each other, resulting in bite injury of convex and concave die edges. For example, during the assembly of the mold, the positions of the male and female molds are offset and the gap is uneven. When the mold without guide is installed, the gap between the male and female molds is not adjusted properly, and the male and female molds bite and damage each other.
