Cracks of aluminum alloy casting castings appear

　　In the production process of aluminum alloy pressure castings, it is often encountered in cracks in the product. It is mainly manifested in the surface of the die -casting parts with straight or wave -shaped patterns. It is narrow and long, and there is a development trend under external force. The production of cracks not only has a certain impact on the surface of the product casting, but also has a great impact on the mechanical properties of aluminum alloy die. So how to avoid and solve such defective problems?

　　Finding a solution must be analyzed from the cause of the cracks. For the cause of the cause, the solution is given.

　　1. Excessive iron content in the alloy or silicon, too high content

　　2. Excessive harmful impurities of alloy, which reduces the plasticity of the alloy

　　3. Aluminum, silicon, copper alloy is too high or low in copper content

　　4. Mold, especially the overall temperature is too low

　　5. The wall thickness of the casting is blocked by the thick changes in the thin deposit, and the pointed corner forms a stress

　　6. The mold staying time is too long, the stress is large

　　7. Unewal force when it comes out

　　The processing method is:

　　1. Correctly control the alloy ingredients. In some cases, you can add pure aluminum ingots to the alloy to reduce the amount of magnesium in the alloy or aluminum silicon in aluminum alloy to increase the silicon content

　　2. Change the casting structure and angle, change the slope of the mold, and reduce the difference in wall thickness

　　3. Change the goods and increase the top position to make the top out of the top

　　4. Shorten the mold opening and pump time to increase the mold temperature and keep the mold heat balance.

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