How to adopt the heat treatment method to reduce the heat treatment deformation of the mold?

1. Pre-heat treatment
For precision and complex molds, if the hardness requirements are not too high, pre-heat-treated pre-hardened steels can be used, and pre-heat-treated mold steels (such as 3Cr2Mo, 3CrMnNiMo steel) can be used to reach the hardness at the time of use (the lower hardness is 25~35HRC). , the higher hardness is 40~50HRC), and then the mold is processed and formed without heat treatment, so as to ensure the precision of the precision and complex mold.
2. Using quenching and tempering heat treatment
For precision and complex molds that do not require high substrate hardness and high surface hardness, quenching and tempering heat treatment can be performed after rough machining of the mold, and low-temperature nitriding treatment (500~550°C) after finishing. Low, there is no phase transition of the matrix structure, and the furnace is cooled to room temperature, the cooling stress is also less, and the mold deformation is small.
3. Use age-hardening die steel
Age-hardening steel can be used for sophisticated and complex molds. For example, PMS (1Ni3Mn2CuA1.Mo) steel is a new type of ageing mold steel. The hardness after solution quenching at 870°C is about 30HRC, which is convenient for machining. Aging heat treatment of about 500°C can obtain a high hardness of 40~45HRC, and the mold deformation is small, only need to be polished, it is an ideal steel for precision and complex molds.

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