15-year precision mould making

     For the shape of the complex mold, after the rough machining of heat treatment, and then finishing, in order to ensure that the deformation of heat treatment. For precision hardened steel plastic mold spare parts, the deformation should be less than 0.05%.
     Plastic mold cavity surface is very strict, so to ensure type cavity surface not by oxidation, decarburization, erosion, overheat in the quenching processing. Should be heating in protective gas furnace or in the rigorous deoxygenation of the salt bath furnace, if the general box type resistance furnace heating should be in the mold cavity surface coated with protective agent, at the same time to control the heating rate, cooling should choose moderate cooling medium, control the cooling rate to avoid plastic mold spare parts in quenching process produce deformation and cracking. In general, the best can be used hot bath hardening or delay quenching.
     Should be tempered after quenching, the tempering temperature should be higher than the working temperature of the mould, and the tempering time depends on the mould material and the section size, but at least 40 to 60min.