In die casting mold manufacturing, the most common form of mold damage is cracks and cracks. Stress is the main cause of mold damage. Thermal, mechanical, chemical, and operational shock are all sources of stress, including mechanical and thermal stress. If the heat treatment is not performed properly during the mold processing, it will cause the mold to crack and be scrapped prematurely, especially using only quenching and tempering without quenching. Then, the surface nitriding process is performed, and surface cracking and cracking will occur after several thousand die-casting times.