What are the key considerations for the annealing process of plastic molds? Injection plastic parts production

 

The main purpose of annealing plastic molds is to eliminate internal stress caused by various factors, ensuring the parts meet usage standards, eliminating obvious defects in appearance, and improving the performance of the mold steel to facilitate subsequent processing.

 

Annealing makes the internal metal structure of the mold more stable and balanced, guaranteeing the quality of subsequent processing and final heat treatment. Annealing is the process of transforming pearlite in the mold metal. Because mold manufacturing involves forging, welding, and cutting processes, certain residual stresses are generated. Annealing eliminates these residual stresses from deformation processing, welding, and other technological processes, preventing deformation and inaccuracies during machining.

 

To completely eliminate residual stress in the workpiece, the heating temperature should be gradually increased from low to high until the optimal temperature is reached. The holding time and cooling rate should be determined based on the specific conditions of the workpiece.

 

Commonly used annealing methods include full annealing, spheroidizing annealing, stress-relief annealing, recrystallization annealing, diffusion annealing, and isothermal annealing. Each method is suitable for mold steels with different material properties and residual stresses caused by different processes.

 

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