Surface treatment technology for die-casting molds

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Die casting molds are a large category of molds. With the rapid development of China's automobile and motorcycle industries, the die-casting industry has ushered in a new period of development. At the same time, higher requirements have been put forward for the mechanical performance and service life of die-casting molds. In order to meet the increasing performance requirements, it is still difficult to rely on new mold materials. Various surface treatment technologies must be applied to casting molds, and die casting molds must achieve surface treatment with high efficiency, high precision, and long service life requirements. Pressure casting is a process of high pressure and high speed full mold and molten metal formed by die casting in repeated contact with hot metal. Therefore, die casting molds have high heat resistance, thermal fatigue wear, corrosion resistance, impact toughness, red hardness, and good demolding performance. Therefore, in recent years, various new technologies for surface treatment of die-casting molds have emerged, but they can generally be divided into the following three categories:

(1) Improvement of traditional heat treatment process;

(2) Surface modification technology, including surface treatment, surface thermal diffusion strengthening, and electric spark strengthening technology; (3) Coating technology, including chemical plating, etc.

Improvement of Traditional Heat Treatment Process

The traditional heat treatment process for die-casting molds is quenching and tempering. Due to the fact that various materials can be used as die-casting molds, the application of the same surface treatment process and technique in different materials will have different effects. SKOV has recently proposed pre-treatment techniques for substrate materials, surface treatment techniques, and treatment techniques for mold substrates. Different mold materials are proposed based on traditional processes to improve mold performance and prolong mold life. Another development direction of heat treatment technology is to combine traditional heat treatment technology with advanced surface treatment technology to improve the service life of die-casting molds. If the carbon nitrogen co infiltration chemical treatment method is combined with conventional quenching and tempering processes (i.e. carbon nitrogen co infiltration carbon nitrogen co infiltration quenching) and NQN composite strengthening, it not only has high surface hardness and an increase in effective hardening layer depth, layer hardness gradient distribution, stability, and fire resistance and corrosion resistance, but also obtains good performance cores, greatly improving performance and surface quality.