Causes of damage in die-casting molds manufacturing
Publish Time: 2024-05-24
In the manufacturing and production of die-casting molds, the most common forms of mold damage are cracks and cracking. Stress is the main cause of mold damage. Thermal, mechanical, chemical, and operational shocks are all sources of stress, including mechanical stress and thermal stress. If the heat treatment is improper during the mold processing, it will cause the mold to crack and be scrapped prematurely, especially if only quenching is used without quenching, and then the surface nitriding process is performed. After thousands of die castings, surface cracking and cracking will occur.Stress is generated during steel quenching, which is the result of the superposition of thermal stress during cooling and organizational stress during phase change. Quenching stress is the cause of deformation and cracking, and tempering must be performed to eliminate stress. In the production process, the mold temperature mold should be preheated to a certain temperature before production, otherwise when the high-temperature metal liquid is filled, it will cause quenching, resulting in an increase in the temperature gradient between the inner and outer layers of the mold, forming thermal stress, causing the mold surface to crack or even crack. In the production process, the mold temperature continues to rise. When the mold temperature is overheated, it is easy to cause mold sticking, and the moving parts will fail, resulting in damage to the mold surface. A cooling temperature control system should be set to keep the mold working temperature within a certain range.
