The main reasons why copper alloy moldshave a shorter lifespan than aluminum alloy molds include the following:

‌High temperature and high pressure impact‌: During the die casting process, copper alloys have a high melting point, fast filling speed, and high filling pressure. Under the impact of high-temperature copper liquid, the mold cavity surface is subjected to great mechanical stress, resulting in fatigue damage to the cavity surface, forming cracks, and eventually causing mold cracking.

‌Thermal stress effect‌: During the use of copper alloy molds, the mold cavity temperature repeatedly changes between 360℃ and 550℃, and the mold undergoes a "thermal expansion and contraction" cycle mode, resulting in fatigue damage to the cavity surface, forming cracks, and even cracking failure.

‌Material properties‌: The physical and chemical properties of copper alloys also affect the lifespan of their molds. Copper has good thermal conductivity, but its wear resistance and corrosion resistance are not as good as aluminum alloys. In addition, copper alloys have poor toughness and are prone to cracking under mechanical stress.

‌Methods to extend the life of copper alloy molds include:

‌Select appropriate mold steel and heat treatment process‌: Select mold steel with crack propagation and extension resistance, and extend the mold life through optimized heat treatment process‌.

‌Improve mold design‌: Rationally design the mold structure, reduce stress concentration and thermal stress, and improve the durability of the mold‌.

‌Optimize use and maintenance‌: Pay attention to maintenance and care during use, avoid excessive use and improper operation, and regularly check and repair mold damage.