采用上述方式处理的模具经过低温时效后延迟了龟裂纹的出现，采用本发明的技术方案使模具的寿命大为延长。
The mold which is treated by adopting the way delays the emergence of craquelure after low-temperature aging, and by adopting the technical scheme, the service life of the mold is greatly prolonged.
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