Causes of damage in die-casting molds manufacturing

In the manufacturing and production of die-casting molds, the most common forms of mold damage are cracks and cracks.

Stress is the main cause of mold damage. Thermal, mechanical, chemical and operational influences are all sources of stress, including mechanical and thermal stresses. Improper heat treatment during mold processing will cause cracking and premature scrapping of the mold, especially if only tempering is used instead of quenching.

The surface is then nitrided, and surface cracks and cracks will appear after several thousand die castings. The stress generated during quenching of steel is the superposition of thermal stress during cooling and structural stress during phase transformation.

Quenching stress is the cause of deformation and cracking, and tempering must be performed to eliminate the stress. During the production process, the mold temperature mold should be preheated to a certain temperature before production, otherwise it will be chilled when filling with high-temperature molten metal, causing the temperature gradient between the inner and outer layers of the mold to increase, forming thermal stress and causing cracks on the surface of the mold.

Even cracking. During the production process, the mold temperature continues to rise. When the mold temperature is overheated, mold sticking is likely to occur, and moving parts may malfunction, causing damage to the mold surface. A cooling temperature control system should be set up to keep the mold working temperature within a certain range.