The annealing treatment of plastic molds is mainly to eliminate the internal stress caused by different reasons, so that the quality of the parts meets the use standards, 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, ensuring the quality of subsequent processing and final heat treatment. Annealing is the process of pearlite transformation in the mold metal. Since the mold requires forging, welding, cutting and other process means during the manufacturing process, a certain residual stress will be generated accordingly. Annealing can eliminate the residual stress existing in deformation processing, welding, process technology and parts, avoiding deformation and inaccurate precision of the workpiece during processing.

Plastic mold

In order to completely eliminate the residual stress in the workpiece, the temperature should be increased from low to high until the most suitable temperature during heating, and the length of the insulation time and the speed of cooling should be determined according to the actual situation of the workpiece.

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

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