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The hollow sprue and suitable vacuum pressure is helpful to decreasing the pinhole,but,when the vacuity is too high,the liquid aluminum would become turbul... 充型過程中施加一定的真空度有利於減少針孔,但真空度太高則會促使鋁液産生紊流,反而增加鑄鋁件的針孔,降低其密度。