How To Adopt The Heat Treatment Process To Reduce The Heat Treatment Deformation Of The Mold?

1. Adopt pre-heat treatment

For precision and complex molds, if the hardness requirements are not too high, pre-heat-treated pre-hardened steel can be used, and the mold steel (such as 3Cr2Mo, 3CrMnNiMo steel) can be pre-heated to reach the hardness in use (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 accuracy of the precision and complex mold.

2. Adopt quenching and tempering heat treatment

For precision and complex molds with low matrix hardness requirements and high surface hardness requirements, quenching and tempering heat treatment can be performed after rough machining of the mold, and low temperature nitriding treatment (500~550?C) after finishing, due to the mold nitriding temperature Low, there is no phase transition of the matrix structure, in addition, the furnace is cooled to room temperature, and the cooling stress is also less, and the mold deformation is small.

3. Use age-hardening die steel

Aging hardening steel can be used for precision and complex molds. For example, PMS (1Ni3Mn2CuA1.Mo) steel is a new type of aging mold steel. The hardness after solution quenching at 870?C is about 30HRC, which is convenient for machining. The aging heat treatment of about 500°C can obtain a higher hardness of 40~45HRC, the mold deformation is small, and only needs to be polished. It is an ideal steel for precision and complex molds.