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铸件表面出现孔洞的原因?

  答:A蜡料灰(hui)分(fen)超高;B.脱蜡不(bu)净或模壳长“豆芽”;C.型(xing)壳焙烧不(bu)良;D.钢水净化不(bu)足(zu):金属液脱氧(yang)、除气不(bu)充分(fen);E.浇(jiao)注速度过快;F.浇(jiao)注系统不(bu)合理不(bu)利于排气。

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