There are many factors that affect the service life of the die-casting die. The die-casting die factory has summarized a variety of methods that can improve the service life of the zinc aluminum alloy die-casting products, such as reasonable surface treatment and stress relief. The following details the methods to improve the service life through stress relief.
During die-casting, there will be temperature difference on the die surface. Sometimes, thermal strain will occur due to the temperature difference. If this thermal strain is repeated for many times, it will lead to residual stress on the surface of zinc aluminum alloy die-casting. In most cases, this residual stress is tensile stress, which will lead to thermal cracking of aluminum alloy die-casting die. If the stress can be eliminated, the residual tensile stress of die-casting die can be reduced, The effect of prolonging the service life of aluminum alloy die-casting die can be achieved.
After knowing that the hot cracking of zinc aluminum alloy die casting is caused by stress, the die casting die factory has found the corresponding solution through research, that is, the stress relief treatment is carried out after a period of mold test. For example, the stress relief treatment is carried out after 1000 ~ 2000 mold times and 5000 ~ 10000 mold times respectively. This treatment can be repeated every 10000 ~ 20000 mold times in the future, To achieve the goal of minimizing the thermal cracking of aluminum alloy die-casting die. The die casting die factory gives a warm reminder that during stress treatment, the temperature is about 25 ℃ below the high tempering temperature of heat treatment. Under normal circumstances, the temperature is kept at this temperature for 2 hours.
