Surface treatment method of cold stamping die

Abstract

The invention relates to the technical field of metal surface heat treatment, and particularly to a surface treatment method of a cold stamping die. The surface treatment method is characterized in that the PVD treatment is adopted, so that the surface of the cold stamping die produced is more aligned with the assembling and manufacturing requirements, and the friction coefficient of the surface coating can better satisfy the clients' requirement compared with that in the prior art.

Description

technical field [0001] The invention relates to the technical field of metal surface heat treatment, in particular to a surface treatment method of a cold stamping die. Background technique [0002] At present, in the automobile manufacturing industry, stamping parts account for more than half of the auto parts. The failure mode of the mold is one of the most important reasons affecting the product qualification rate and production cost. Among them, the cold stamping die is mainly used to produce plastic deformation or separation of the metal sheet to form the required parts, and the requirements for the hardness, toughness, wear resistance and fatigue resistance of the mold material are relatively high. With the increasingly fierce market competition, automobile companies need to reduce manufacturing costs, especially mold costs. However, cold working dies for stamping production of a large number of parts are prone to failure forms such as deformation, wear, fatigue and ...

AI Technical Summary

Problems solved by technology

Observation under the metallographic microscope shows that the matrix structure of the punching die currently in use is tempered martensite and irregularly shaped and unevenly sized massive carbides distributed in the matrix along the grain boundaries. These irregularly shaped blocks The carbon-like carbides are distributed in chains in the matrix, so that the interface between the carbides and the matrix is ​​prone to stress concentration, resulting in micro-cracks, and the mold is prone to cracking and failure under the stamping stress; The thickness of the coating is only about 3μm, and it is easy to peel off during the stamping process, causing the die to fail due to surface wear

[0004] Aiming at the problem of short service life of the existing punching dies due to cracking and wear, on the basis of selecting a suitable base material, optimize the heat treatment process and adjust the structure state to achieve a better combination of strength and toughness; then develop different surface Treatment technology carries out surface strengthening treatment, so that the punching die maintains the characteristics of external hardness and internal toughness, so as to achieve the purpose of significantly prolonging the service life of the punching die

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