How to improve the use of mold heat treatment mold performance

How to improve the use of mold heat treatment mold performance

Die heat treatment is to play the potential of mold materials and improve the use of mold performance. Mold performance must meet: high strength (including high temperature strength, thermal and thermal fatigue resistance) high hardness (wear resistance) and high toughness, and also requires good machinability, including good polishing ) Weldability and corrosion resistance and so on.

Mold heat treatment is an important process to ensure mold performance, the mold manufacturing accuracy, plastic mold strength, mold working life, mold manufacturing costs have a direct impact.

Complex molds, processing technology is correct or not on the deformation of the mold often have a greater impact on some mold heating process can be clearly seen, the heating speed, often have a greater deformation.

(1) causes of deformation

Any metal heated to expand, because the steel in the heating, the same mold, all parts of the uneven temperature (ie, uneven heating) will inevitably cause various parts of the mold expansion inconsistency, resulting in heating due to heating Uneven internal stress. In the steel below the phase transition temperature, uneven heating mainly produces thermal stress, over the phase transition temperature heating uneven, but also produce unequal time-varying tissue, both to produce tissue stress. Therefore, the faster the heating rate, the mold surface and the heart of the greater the difference between the temperature, the greater the stress, the greater the deformation of the plastic mold after heat treatment.

(2) Preventive measures

Complex molds in the phase transition point below the heating should be slow heating, in general, the mold vacuum heat treatment deformation than salt bath furnace quenching much smaller. Preheating, for low alloy steel mold can be a preheating, high alloy die should be used twice preheating.