New Surface Treatment Technology For Various Die Casting Molds

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Technology For Various Die Casting Molds

Various new technologies for surface treatment of die-casting molds are emerging, but in general, they can be divided into the following three categories:

(1) Improved techniques for conventional heat treatment processes;

(2) Surface modification technology, including surface thermal diffusion treatment, surface phase transformation strengthening, and electric spark strengthening technology;

(3) Coating technology, including electroless plating.

1. Improved technology of traditional heat treatment process

The traditional heat treatment process of die-casting molds is quenching-tempering, and later surface treatment technology has been developed. Because of the variety of materials that can be used as die-casting molds, the same surface treatment techniques and process applications can have different effects on different materials.

Schkov proposes a substrate pretreatment technology for mold substrate and surface treatment technology. Based on the traditional process, suitable processing technology is proposed for different mold materials to improve mold performance and improve mold life.

Another development direction of heat treatment technology improvement is to combine the traditional heat treatment process with advanced surface treatment technology to improve the service life of the die casting mold.

For example, carbonitriding by chemical heat treatment, combined with conventional quenching and tempering processes, NQN (ie carbonitriding-quenching-carbonitriding composite strengthening, not only obtains high surface hardness but also effectively hardens the layer). The depth is increased, the hardness gradient distribution of the layer is reasonable, the tempering stability and the corrosion resistance are improved, so that the surface quality and performance of the die-casting mold are greatly improved while obtaining good core performance.

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