progressive die manufacturing.Causes and solutions of cracks in aluminum alloy die casting parts

　　The production of internal cracks in aluminum alloy die casting parts is really a headache, then we want to solve this problem, first of all, we must understand the causes of cracks in aluminum alloy die casting parts in detail!

　　Through analysis, we can see that the main reasons for the crack of die-casting aluminum are: (1) the content of iron in the alloy is too high or the content of silicon is too low; (2) The content of harmful impurities in the alloy is too high, reducing the plasticity of the alloy; (3) aluminum silicon alloy: aluminum silicon copper alloy zinc or copper content is too high, aluminum magnesium alloy contains too much magnesium (4) mold, especially the core temperature is too low; (5) There is a drastic change in the wall thickness of the casting; (6) The die time is too long; (7) The force is not equal when ejecting.

　　Through the above reason analysis, we get the following improvement measures to avoid the occurrence of cracks in aluminum alloy die casting parts:

　　1. Correct control of alloy composition, in some cases can be added to the alloy pure aluminum ingots to reduce the magnesium content of the alloy or aluminum alloy to increase the silicon content;

　　2. In order to alleviate the overheating of the mold, add cooling water in the mold, reduce the mold temperature in the area through water cooling, and maintain the thermal balance of the mold; Change the structure of aluminum alloy die casting, increase the rounded corner, change the mold inclination, reduce the difficulty of mold, aluminum alloy die casting manufacturers, reduce the wall thickness difference;

　　3. Change or increase the ejection position to make the ejection force uniform and eliminate local excessive force.

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