How to extend the life of die-casting molds


Optimize mold design and die casting process Reduce sha […]

Optimize mold design and die casting process
Reduce sharp corners and corners on the mold, use materials reasonably, and standardize processing and heat treatment processes. The nitriding treatment of the mold should control the surface hardness of the mold, HV,> 600, and the depth of the nitrided layer can reach 0.12 to 0.2 mm. Correctly preheat the mold, optimize the mold to improve the internal cooling, make the mold obtain a uniform thermal balance effect, make the mold maintain a stable lower temperature, reasonably spray the coating, the coating is of great significance to delay thermal fatigue cracks, and improve the mold life and benefits.

Die pressure processing is an important part of mechanical manufacturing, and the level, quality and life of the mold are closely related to the mold surface strengthening technology. The working conditions of die-casting molds are extremely complex and harsh, and the main factor affecting mold failure is thermal fatigue. China's aluminum die-casting mold technology has developed to a certain extent, but the gap is very large compared with foreign advanced levels, and the mold life is particularly prominent. It can reach 80,000 to 150,000 mold times abroad, and the life of domestic molds is generally between 40,000 and 80,000 pieces, with an average of 60,000 pieces. The mold life is short, which directly leads to the decline of production efficiency and the increase of product costs. The mold industry is the basic industry of the national economy. The development level of the mold industry is a symbol of the national industrial level and the ability to develop castings. Therefore, the best measures to extend the service life of die casting molds will be important for reducing production costs and improving economic benefits. Realistic significance.

Heat treatment process of die casting mold
The metallographic structure of the material can be changed by heat treatment to ensure the necessary strength and hardness, dimensional stability at high temperature, thermal fatigue resistance, and cutting performance of the material. The parts after heat treatment require less deformation, no cracks and the existence of residual internal stresses should be minimized. At present, the die casting mold is generally vacuum gas quenched, the surface is free of oxides, the mold deformation is small, and the quality of the mold is better guaranteed. ) _Clamp repair_polishing_ + nitriding (or carbonitriding) _finishing or lapping_assembly. For H13 steel, high temperature quenching, double quenching, quenching with controlled cooling rate, and cryogenic treatment are used to improve mold performance and mold life.

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