The difference of three kinds of pore defects in aluminum alloy die casting.custom extruded aluminum enclosures

　　Aluminum alloy die casting is a very widely used die casting, but it is also a very easy to defect die casting, aluminum alloy die casting the most common defect is the appearance of some small holes on its outer surface, some people call these small holes for pores, some people call these small holes for shrinkage holes, then these appear in the surface of aluminum alloy die casting holes in the end what is the "hole"?

　　In fact, the small holes that appear on the surface of aluminum alloy die casting can be divided into the following three types according to the different causes:

　　1, slag hole: in the production process of aluminum alloy die casting, due to the impurity of metal liquid or the entry of foreign bodies in the die casting caused by the hole, the foreign bodies that are inconsistent with the aluminum alloy matrix can be clearly seen.

　　2, pores: in the production process of aluminum alloy die-casting parts, due to the metal liquid filling the die-casting model cavity involved in the gas caused by the holes, will exist in any position of the casting, and can be subdivided into three types of involved pores, precipitated pores and invasive pores.

　　3, shrinkage hole: due to the cooling shrinkage of aluminum alloy die casting caused by holes, often appear far from the inner gate or aluminum alloy die casting on the thick majority, the inner hole is irregular, the hole wall has a metallic luster, has not been polluted.

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