Discussion on the causes of cracking in aluminum alloy die-casting molds

　　The reason for the cracking of aluminum alloy die-casting molds after a period of production is very complex, and there are many ways to solve it.

　　The main reasons for cracking caused by aluminum alloy die-casting molds are:

　　1. During the die-casting production process of the mold, the temperature of the aluminum material is too high

　　2. Unreasonable spraying of release agent during die casting production of molds

　　3. The heat treatment of the mold is not ideal, mainly due to its hardness

　　4. Poor quality of mold steel

　　5. Poor cooling system or water transportation operation in mold design

　　To prevent cracking in die casting and improve the service life of molds, the following points should be done well:

　　1. The heat treatment of the die-casting forming part requires a hardness guarantee of HRC43 to 48.

　　2. The mold should undergo sufficient preheating before die-casting production, and its functions are as follows:

　　2.1. Achieve a good thermal balance in the mold, ensuring uniform solidification speed of the casting and favorable pressure.

　　2.2. Maintain the fluidity of the die cast alloy during filling, with good formability and improve the surface quality of the casting.

　　2.3. Reduce early production defects and improve die casting productivity.

　　2.4. Reduce the thermal alternating stress of the mold and improve its service life.

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