铸件

请教解决铸钢件粘砂和气孔问题

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覆膜砂做ZG25铸钢件,出现粘砂和气孔问题,望高手指导。
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1.尽可能降低浇注温。2.提高砂型紧实度。3.控制型砂水分。4.增加排气道。
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注意砂子的发气性和耐火度,及砂芯紧实度。
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