Since the 70 s, the world has put forward the idea of pre hardened, but because of machine tools and cutting tools, stiffness of the pre hardened hardness can not meet the use of mold hardness, so in the process of the hardening technology r&d. Along with the improvement of the performance of the machine tools and cutting tools, mold material hardening technology development speed, to the 80 s, the international industrial developed countries in plastic mould materials using the proportion of the pre hardened module has reached to 30% (currently at more than 60%).

Our country in the mold material hardening technology, late start, small size, it is can not meet the requirements of domestic mold manufacturing. Using pre hardened mould material, mould manufacturing process can be simplified, shorten the mould manufacturing cycle, improve the manufacturing precision of the mould. Predictably, with the development of processing technology, the pre hardened mould materials will be used for more mould.