Die casting die surface treatment new technology principle and application!

Die casting die is a big category in die. With the rapid development of automobile and motorcycle industry in China, die casting industry has ushered in a new period of development. At the same time, the comprehensive mechanical properties and life of die - casting die are also put forward higher requirements. It is still difficult to meet the demand of continuously improving performance only by relying on the application of new die materials. It is necessary to apply all kinds of surface treatment technology to the surface treatment of die casting die to achieve high efficiency, high precision and high life. In all kinds of die, the working conditions of die casting die are more demanding.

Pressure casting is to make molten metal in high pressure, high speed under the mold cavity and die casting molding, in the process of work repeatedly with hot metal contact, so the requirements of die casting mold has high heat resistance fatigue, thermal conductivity and wear resistance, corrosion resistance, impact toughness, red hardness, good demoulding and so on. Therefore, the surface treatment technology of die casting die has higher requirements in recent years, a variety of new surface treatment technology of die casting die has emerged, but in general, it can be divided into the following three categories:

(1) Improvement technology of traditional heat treatment process;

(2) Surface modification technology, including surface thermal diffusion treatment, surface phase transformation strengthening, edM strengthening technology, etc.

(3) coating technology, including electroless plating, etc.

The traditional heat treatment process of die casting die is quench-tempering, and then the surface treatment technology is developed. Because of the variety of materials that can be used as die casting molds, the same surface treatment technology and process applied to different materials will produce different effects. Shikov recently proposed the substrate pretreatment technology for the mold base material and surface treatment technology, on the basis of the traditional process, to put forward the suitable processing technology for different mold materials, so as to improve the performance of the mold, improve the life of the mold.

Another development direction of heat treatment technology improvement is to combine traditional heat treatment technology with advanced surface treatment technology to improve the service life of die casting die. Such as the chemical heat treatment method of carbonitriding, combined with conventional quenching and tempering process of NQN (that is, the carbonitriding, quenching - carbonitriding) composite reinforcement, not only get high surface hardness, and the effective depth of hardening layer increase, rational distribution of carbonitriding layer hardness gradient, tempering stability and corrosion resistance, so as to make the die casting mould in good heart department performance at the same time, Surface quality and performance are greatly improved.