Surface coating of die-casting die and preparation method of surface coating

Abstract

The invention discloses a surface coating of a die-casting die and a preparation method of the surface coating. The surface coating is characterized in that the coating is a composite coating, whereinthe die steel matrix sequentially comprises a transition bonding layer, an electric coating and a ceramic protection layer from inside to outside; the die steel matrix is subjected to electroplatingto form the electric coating; the electric coating is subjected to electric arc impact, so that elements of the electric coating and the die steel matrix are subjected to mutual diffusion, metallurgical bonding is carried out, and the transition bonding layer is formed; and the ceramic protection layer is formed by in-situ oxidation of the metal element on the outer surface of the electroplating layer in the die casting process. According to the surface coating and the method thereof, the problem of poor bonding force between the electroplating technology coating and the die steel matrix is solved, the industrialization of the electroplating technology coating of the die can be realized, the service life of the die is effectively prolonged, the surface strengthening cost of the die is reduced, the technical problem of surface strengthening treatment of the complex structure die is overcome, and considerable economic benefits are achieved.

Description

technical field [0001] The invention relates to a mold surface strengthening technology, in particular to a surface coating and a preparation method of a die-casting mold. Background technique [0002] Mold is the mother of industry, which plays an important role in promoting the transformation of my country's manufacturing industry from big to strong. Die-casting technology, as an important component of casting technology, has been favored by more and more aluminum alloy auto parts because of its high efficiency and high quality. Favored by the manufacturing industry, such as aluminum die-casting car brackets, aluminum die-casting cylinder blocks, etc. During the die-casting process, the surface of the mold is subjected to the thermal shock of the periodic molten aluminum liquid, the pressure of the aluminum liquid, and the scouring of the release agent for a long time. Among them, the thermal shock of molten aluminum is the most serious damage to the surface of the mold: f...

AI Technical Summary

Problems solved by technology

However, this technology has disadvantages, that is, the thickness of the coating is not enough, the deposition cost is high, and deep hole processing cannot be performed. These problems limit the use of PVD treatment technology in mold surface strengthening technology to a certain extent.

[0007] Compared with the above technologies, the electroplating technology coating has the characteristics of variable and controllable composition, uniform thickness, low cost, and is suitable for molds with complex structures. Field application of mold surface strengthening

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