Introduction and classification of die casting mold surface treatment technology
Introduction and classification of die casting mold surface treatment technology
Die-casting molds are a large category of molds. With the rapid development of my country's automobile and motorcycle industry, the die-casting industry has entered a new period of development. At the same time, higher requirements are put forward for the mechanical properties and life of die-casting molds. In order to meet the increase in performance requirements, it is still difficult to rely on new mold materials. Various surface treatment technologies must be applied to casting molds. Die-casting molds achieve surface treatment with friendly rate, high precision and high life expectancy. Pressure casting is high pressure. , High-speed full mold and die-casting molten metal in the process of repeated contact with the hot metal, so the die-casting mold has higher heat resistance, thermal fatigue wear, corrosion resistance, impact toughness, red hardness, and good mold release. Wait. Therefore, the surface treatment technology of die-casting molds is required in recent years, and new technologies for surface treatment of die-casting molds have emerged continuously.
Classification of die-casting mold surface treatment technology:
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 electroless plating
The traditional heat treatment process of die-casting molds is quenching and tempering. Since various materials can be used as die-casting molds, the same surface treatment process and process will have different effects in different materials. Another development direction of heat treatment technology is to use traditional heat treatment The combination of technology and advanced surface treatment technology can increase the service life of die-casting molds. If the carbonitriding chemical treatment method is combined with the conventional quenching and tempering process (that is, carbonitriding carbonitriding quenching) NQN composite strengthening, it not only has a high surface hardness and an increase in the effective hardened layer depth, the layer The hardness gradient distribution, stability and fire and corrosion resistance are improved, so as to obtain good performance cores at the same time, and greatly improve performance and surface quality.
