Precise mold processing Heat treatment deformation is one of the main defects in the mold processing process, for some sophisticated complex mold, often due to heat treatment deformation and scrapped, so control the deformation of sophisticated mold has become a key issue in heat treatment production. It is well known that the mold in the heat treatment, especially in the quenching process, due to precision mold processing sections of the heating and cooling rate of the inconsistency caused by the temperature difference, combined with organizational changes in the unequal and other reasons, making the mold part of the volume Uneven expansion and contraction, uneven organization changes, resulting in "tissue stress" and the temperature difference between the mold caused by the thermal stress. When the internal stress exceeds the yield limit of the mold, it will cause deformation of the mold. Therefore, the reduction and control of precision and complex mold deformation is the majority of heat treatment workers an important research topic.
Precise mold processing material effects:
(1) the cause of the mold oval (deformation) This is because the mold steel is a certain direction of the distribution of non-uniform carbide, carbide expansion coefficient than the steel matrix structure about 30% smaller, when heating it to prevent the mold Hole expansion, cooling and then prevent Dongguan precision mold processing hole shrinkage, so that the mold hole uneven deformation, so that the mold hole rounded oval.
(2) Precautionary measures:
 ① in the manufacture of sophisticated and complex mold, to try to choose a smaller carbide carbide carbide, do not map cheap, the choice of small steel mills produced poor material.
 ② the existence of carbide serious segregation of the mold steel to be a reasonable forging, to break the carbide blocks, reduce the uneven distribution of carbide grades, to eliminate the performance of anisotropy.
③ for the forging of the mold steel to be quenched and tempered heat treatment, so that the distribution of carbide uniform, small and dispersed sorbite structure, thereby reducing the precision of complex mold heat treatment deformation.
 ④ for large size or can not forging the mold, can be used solid solution double refinement treatment, so that the carbide refinement, uniform distribution, angular round, can be achieved to reduce the precision mold processing heat treatment deformation purposes.