Heat treatment is an indispensable process in the manufacturing process of open mold injection molding. The main purpose of heat treatment is to improve the precision of the mold, thereby improving the service quality and life of the workpiece. Let's take a look at the main process of mold heat treatment. Die heat treatment process
Forging process: This is the key link in the manufacture of die parts. For high alloy tool steel dies, it is necessary to put forward technical requirements for metallographic structure such as carbide distribution of materials. At the same time, the forging temperature range must be strictly controlled, a reasonable heating specification should be formulated, and a suitable forging method should be adopted, and finally a slow cooling or timely annealing treatment should be carried out.
Preliminary heat treatment: According to the material and requirements of the mold parts, the use of annealing, normalizing or tempering and other preparatory heat treatment process to improve the organization, eliminate the defects generated in the forging process, and improve the processing technology. High carbon alloy die steel after appropriate preparatory heat treatment, can eliminate the network of secondary cementite or chain carbide, so that the carbide spheroidized, refined, to ensure the quality of quenching and tempering, thereby extending the life of the die.

Quenching and tempering: This is the key link in the heat treatment. If there is overheating during quenching heating, it will lead to increased brittleness of the workpiece, easy deformation and cracking during cooling, which seriously affects the life of the mold. In the process of die quenching heating, special attention should be paid to prevent oxidation and decarbonization, and strict control of heat treatment process specifications. When conditions permit, vacuum heat treatment is a good choice. Tempering should be done in time after quenching, and different tempering processes should be selected according to technical requirements.
Stress relief annealing: After the mold processing parts, the stress relief annealing treatment is carried out, the purpose is to eliminate the internal stress caused by rough machining and prevent quenching