A method for actively modifying the surface of metal plastic forming dies

Abstract

The invention provides an active modifying method of the surface of metal plastic forming dies. The method comprises the following steps that roughening processing is conducted on the surfaces of the male dies to actively enhance the roughness of the surfaces of the male dies and the material adhesion performance of the surfaces of the male dies; regular concave cavities and regular grooves are formed in the surfaces of the female dies through machining for storage, even distribution and conveying of lubricating oil. The method has the advantages that the roughness of the surfaces of the male dies and the surfaces of the female dies is controlled, material distribution of formed parts is optimized, the surface strength of the formed parts is improved, the surface residual stress state is improved, the thicknesses of the formed parts are made to be evener, stress concentration is weakened and the quality is greatly improved; the abrasive resistance of the surfaces of the dies is greatly improved and the service life of the dies can be prolonged. Compared with a punching technology where the method is not implemented, the probability that the cracking phenomenon occurs is reduced by 47% and the uniformity of the formed parts is improved by 40%.

Description

technical field [0001] The invention relates to a method for actively modifying the surface of a metal plastic forming die, which belongs to the field of mechanical manufacturing. Background technique [0002] Metal plastic forming process plays an important role in mechanical processing, among which stamping process is the most typical and widely used. The stamping process is a process of applying external force to plates, strips, pipes and profiles by presses and molds to cause plastic deformation or separation to obtain stamped parts of the desired shape. In order to meet the aesthetic requirements, modern automotive panels often have complex three-dimensional dimensions, which impose strict requirements on both stiffness and thickness. The thinner thickness will reduce the manufacturing cost and weight of the whole vehicle, and improve the economy of the vehicle. The above requirements put forward new requirements for the traditional stamping process, and the optimizat...

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Problems solved by technology

[0004] Chinese patent 200410010847.4 discloses a laser quenching and hardening treatment method for cutting tools and mold edges. This method only performs surface modification treatment on the workpiece, and does not involve modification treatment on the surface of the workpiece, that is, it fails to change the formability of the mold.

[0007] The published information shows that the existing technology has limitations and particularities in the implementation of surface modification of laser forming molds, which are specifically manifested in: 1. The implementation object is limited to barrel-shaped parts or simple formed parts; 2. Only the convex mold can be determined. Or the rounded corner area of ​​the concave die needs to be surface modified, and the degree of surface modification cannot be judged; 3. It cannot be implemented in some forming molds without punch rounded corners, such as spherical parts; 4. For different formed parts, there is no one A set of standard methods for formulating surface modification schemes, and the reproducibility of the methods is poor

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