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The reason of zamak die casting parts have holes
Copy from:    Author:kenostian    Time:2015-04-27 16:09:31    Popularity:603

     The holes are two kinds of zamak die casting parts, mainly is the blowhole and shrinkage hole, the blowhole is often round, and shrinkage hole mostly irregular.
         (1) the blowhole cause: the liquid metal in the mold filling, solidification process, because the gas invasion, leading to the casting surface or internal holes. or is out of the volatile gas of coating. or the alloy liquid gas content is too high, the coagulation precipitation. When the mold exhaust is not good, these adverse factors will lead to the formation of pores of zamak die casting parts.
         (2) the shrinkage reasons: the solidification process of liquid metal, because of the volume reduction or the final solidification position not feeding of molten metal and the shrinkage hole. Casting uneven thickness or local overheating, causing a slow solidification position, volume shrinkage is formed on the surface of the concave position.
         If the zamak die casting have the blowhole and shrinkage hole, on surface treatment, hole may enter the water, when the painting and plating after baking, hole gas heating expansion; or hole internal water becomes vapour, volume expansion, thus lead to the casting surface blister.


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