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In recent years, the method of adding rare earth elements to Die-Casting Tooling Design surface strengthening has been widely praised. This is because rare earth elements have many functions , such as improving the permeability rate, strengthening the surface and purifying the surface, etc., which have a great impact on the improvement of the mold surface structure, physical, chemical and mechanical properties of the surface, and can improve the permeability rate, strengthening the surface and forming rare earth compounds. At the same time, it can eliminate the harmful effect of trace impurities on grain boundary, and strengthen and stabilize grain boundary on mold cavity surface. In addition, rare earth elements interact with harmful elements in steel to form compounds with high melting point, which can inhibit the segregation of these harmful elements on grain boundary, thus reducing the brittleness in deep layer. In die casting die surface strengthening process adding rare earth elements, can obviously increase the infiltration of various method of carbonitriding layer thickness and improve the surface hardness, at the same time, makes the fine dispersion of carbonitriding layer organization and hardness gradient descent, so as to make the mould wear resistance, cold resistance and thermal fatigue performance significantly increased, thus greatly improve the life of the die. Currently, the treatment methods applied to die casting die cavity surface include rare earth carbonizing, rare earth carbonizing, rare earth boron carbonizing, rare earth boron aluminum carbonizing, rare earth soft nitriding, rare earth sulfur nitriding, etc.
Die pressure machining on Furniture Cast Solution is an important part of mechanical manufacturing, and the level, quality and life of die are closely related to die surface strengthening technology. With the progress of science and technology, the surface treatment technology of various molds has made great progress in recent years. (1) the improvement of the traditional heat treatment process and its combination with other new processes; (2) surface modification technologies, including carburizing, low-temperature thermal diffusion (various nitriding, carburizing, ion nitriding, ternary co-diffusion, etc.), salt bath thermal diffusion, boronizing, rare earth surface strengthening, laser surface treatment, and electrospark deposition of cermetamics; Coating technology and other aspects. However, for the die casting die with extremely demanding working conditions, the existing new surface treatment technology cannot meet the increasing requirements, so it is expected that more advanced technology is also expected to be applied to the surface treatment of die casting die. Considering that surface treatment is one of the important means to improve die casting die life, surface treatment technology will play a decisive role in improving the overall level of die casting die production in China.
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