Low pressure casting mold is the main category of mold. With the rapid development of China's automobile and motorcycle parts industry, the low-pressure casting industry has ushered in a new period of development. At the same time, the mechanical properties of low pressure casting mold life also put forward higher requirements. With the progress of the times, the use of new molds that rely only on space-time information is still difficult to use. Need to use a variety of appearance and processing capabilities and low pressure casting mold appearance. In order to achieve high-precision, long-life low-pressure casting mold. The task requirements of various molds and low-pressure casting molds are higher.

According to the process of repeated forging and contact with molten iron, the molten metal is placed in a high-pressure state and filled with a high-speed die-casting cavity. Therefore, there is a need for low pressure casting molds having high heat loss, thermal conductivity and wear resistance, corrosion resistance, impact toughness, red hardness, and excellent mold release properties. Therefore, the appearance of low pressure casting mold processing technology requirements are relatively high. In recent years, various low-pressure casting molds have appeared from time to time. They have new skills in appearance handling, but can generally be divided into three categories:

1. Improve the technology of traditional heat treatment process;

2. Appearance modification skills, including appearance thermal diffusion treatment and phase change appearance, enhance spark enhancement ability;

3. Electroplating technology, including chemical plating, etc.

The traditional heat treatment process of low-pressure casting molds is quenching and tempering for later use. All kinds of information can be used as low-pressure casting molds, differences in event information, and differences between the results of the same appearance processing skills and techniques. According to the substrate pretreatment technology, history, processing technology of the appearance of the mold data, compare the difference between the mold substrate processing technology and the traditional process, improve the function of the mold, and gradually improve the life of the mold. Another technology is to use traditional heat treatment technology and advanced processing technology to improve the development of offset heat treatment and improve the life of low-pressure casting molds.

The carbon-nitrogen co-penetration treatment method of chemical heat treatment is combined with the actual quenching and tempering process to compound out.NQN parts (I. e., carbonitriding quenching and carbonitriding). Not only the hardness appears, but also the useful depth of the hardened layer. The hardness gradient diffusion of the additional layer is reasonable, which improves the tempering stability and corrosion resistance, and significantly improves the low pressure castingMoldquality and functionality.