In the process of handling and production of die-casting mold, due to improper operation, it is easy to cause damage to the die-casting mold. So what is the specific reason? Let’s take a look at the two major causes of die-casting mold damage.
In the mold processing process, improper heat treatment will cause the mold to crack and scrap it prematurely, especially if only quenching and tempering is used without quenching, and then the surface nitriding process, surface cracks and cracks will appear after several thousand die castings.
The stress produced when steel is quenched is the result of the superposition of the thermal stress during the cooling process and the structural stress during the phase transformation. The quenching stress is the cause of deformation and cracking, so tempering must be performed to eliminate the stress.
during production process:
The mold should be preheated to a certain temperature before production, otherwise, chilling will occur when the high-temperature molten metal is filled, which will cause the temperature gradient of the inner and outer layers of the mold to increase, forming thermal stress, and cracking or even cracking on the mold surface. In the production process, the mold temperature continues to rise. When the mold temperature is overheated, it is easy to produce mold sticking, and the failure of moving parts causes damage to the mold surface.