Notable is, although the same as the type of the defect hexing precision casting for different casting alloy casting, the forming reason and preventing measures are distinct.With, for example, is a carbon alloy iron, with defects, appear shrink away L is for steel castings, riser and chill should be adopted to prevent the shrinkage cavity defects;For the large thick wall nodular cast iron parts, can use the solidification process of graphite expansion, and without riser casting is used to eliminate the shrinkage cavity defects.Therefore, we should analysis of the specific situation in details.In order to deepen the understanding of the casting defects, hexing precision casting for some of the typical cases of casting defects were analyzed, and could help.
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