1. Forging process. This is an important link in the manufacturing process of plastic mold working parts. For the plastic mould made of high alloy Tool steel, technical requirements are usually put forward for the metallographic structure such as carbide distribution of the material. In addition, it is necessary to strictly control the forging temperature range, develop correct heating specifications, use the correct forging force method, and slow cooling or timely annealing after forging.

2. Prepare for heat treatment. Preparation heat treatment processes such as annealing, normalizing, or quenching and tempering should be used according to the different materials and requirements of plastic mold working parts to improve the structure, eliminate the structural defects of forged blanks, and improve the processing technology. High carbon alloy die steel, after appropriate preparatory heat treatment, can eliminate network secondary cementite or chain shaped carbides, spheroidize and refine carbides, and promote the uniformity of carbide distribution. This is beneficial for ensuring the quality of quenching and tempering, and improving the lifespan of the mold.

3. Quenching and tempering. This is a key link in mold heat treatment. If overheating occurs during quenching and heating, it not only causes significant brittleness of the workpiece, but also easily causes deformation and cracking during cooling, seriously affecting the lifespan of the mold. Special attention should be paid to preventing oxidation and decarburization during quenching and heating of stamping dies. The heat treatment process specifications should be strictly controlled, and vacuum heat treatment can be used if conditions permit. After quenching, timely tempering should be carried out and different tempering processes should be adopted according to technical requirements.

4. Stress relieving annealing. After processing plastic mold parts, stress relieving annealing treatment should be carried out to eliminate the internal stress caused by rough machining, in order to avoid excessive deformation and cracks caused by quenching. For molds with high precision requirements, stress relieving tempering treatment is also required after grinding or electric machining, which is beneficial for stabilizing mold accuracy and improving service life.