Fine and messy molds should be pre-heated to eliminate the residual stress that occurs during machining. For fine and messy molds, if the conditions permit, try to use vacuum heating quenching and cryogenic treatment after quenching. On the premise of ensuring the hardness of the mold, try to use pre-cooling, hierarchical cooling quenching or warm quenching processes.
Choose materials reasonably. For fine and messy molds, micro-deformed mold steels with good raw materials should be selected. For mold steels with severe carbide segregation, reasonable casting and quenching and tempering heat treatment should be carried out. For larger and uncastable mold steels, solid solution double refinement heat treatment can be carried out. Reasonably select the heating temperature and control the heating speed. For fine and messy molds, slow heating, preheating and other balanced heating methods can be adopted to reduce the heat treatment deformation of the mold.