1. Reasonable material selection. For precision complex molds, micro-deformation mold steel with good quality should be selected. Mold steel with serious carbide segregation should be reasonably cast and subjected to quenching and tempering heat treatment. Solid solution double-refining heat treatment can be performed on larger and uncastable mold steel. Reasonably select the heating temperature and control the heating speed. For precision and messy molds, slow heating, preheating, and other balanced heating methods can be used to reduce mold heat treatment deformation.

2. Correct heat treatment process operation and reasonable tempering heat treatment process are also effective ways to reduce the deformation of precision and messy molds. The causes of deformation of precision complex molds are often complicated, but as long as the deformation rules are mastered, the causes of their occurrence, and special methods are used to prevent the deformation of the mold, the deformation of the mold can be reduced and controlled.

3. Precision and complex molds must be preheated to eliminate residual stress generated during machining. For precision and complex molds, if conditions permit, vacuum heating quenching and cryogenic treatment after quenching should be used as much as possible. On the premise of ensuring the hardness of the mold, try to use pre-cooling, graded cooling quenching, or warm quenching processes.

4. The design and design of the mold should be reasonable, the thickness should not be too different, and the shape should be symmetrical. For molds with large deformation, the deformation rules should be controlled and machining allowance should be reserved. For large, precision, and complex molds, combined design can be used. For some precision and complex molds, pre-heat treatment, aging heat treatment, and quenching and tempering nitriding heat treatment can be used to control the accuracy of the mold. When repairing mold defects such as blisters, pores, and wear, use equipment with low thermal impact such as cold welding machines to avoid the occurrence of deformation during the repair process.