The annealing treatment of the plastic mold is mainly to eliminate the internal stress caused by different reasons, so that the quality of the parts meets the use standards, and there are no obvious defects in the appearance, and the performance of the mold steel is improved to facilitate the subsequent processing procedures.

       Annealing can make the metal structure inside the mold more stable and balanced, and ensure the quality of subsequent processing and final heat treatment. Annealing is the process of transformation of pearlite in the mold metal. Since the mold requires forging, welding, cutting and other technological means during the manufacturing process, a certain residual stress will be generated correspondingly. The annealing treatment can eliminate the residual stress in deformation processing, welding, process technology and parts, and avoid the deformation and inaccuracy of the workpiece during processing.

Plastic mold

       In order to completely eliminate the residual stress in the workpiece, the temperature should be changed from low to high to the most suitable temperature when heating. At the same time, the length of the holding time and the cooling rate should be determined according to the actual situation of the workpiece.

       Commonly used annealing methods include complete annealing, spheroidizing annealing, stress relief annealing, recrystallization annealing, diffusion annealing and isothermal annealing, etc. Each method corresponds to die steel with different material characteristics and residual stress caused by different processes.

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