Improve the mold heat treatment process to prevent deformation of the basic considerations

Mold after quenching deformation, no matter what method, the deformation is unavoidable, but for we will strictly control the deformation of complex precision mold to adopt the following methods to control. 1 the tempering heat treatment to the matrix hardness requirement is not high, and ask for a high precision and complex mould surface hardness, can take the mold after rough machining and tempering heat treatment, low temperature nitriding processing after finishing ( 500 ~ 550 degrees) , due to the moulds nitriding temperature is low, there is no phase transition matrix organization, and furnace cooling to room temperature, cooling less stress, mold deformation is small. 2 USES the heat treatment of complex precision mould in advance, as the hardness requirement is too high, hard steel, heat treatment in advance can be used for steel ( Such as 3 cr2mo, 3 crmnnimo steel) For heat treatment in advance, and make it reach when using hardness ( Low hardness is 25 ~ 35 HRC, higher hardness of 40 ~ 50 HRC) Mould processing forming, and then no longer to heat treatment, so as to ensure the accuracy of precision and complex mould. 3 type using age hardening steel for sophisticated mould can use age hardening steel, such as the PMS ( 1Ni3Mn2CuA1. Mo) Steel is a new type of aging die steel, in 870? C after solid solution hardening of around 30 HRC hardness, easy to machining, mold processing molding again after 500? C about the aging heat treatment, can obtain higher levels of 40 ~ 45 HRC hardness, mold deformation is small, only need polishing processing, is the ideal precision and complex mould steel.