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铸件表面出现孔洞的原因?

  答:A蜡料灰分超高;B.脱蜡不(bu)净(jing)或模壳长“豆芽”;C.型(xing)壳焙烧不(bu)良;D.钢水净(jing)化不(bu)足:金属液脱氧、除气不(bu)充分;E.浇注速度过快(kuai);F.浇注系统不(bu)合(he)理(li)不(bu)利于排气。

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