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怎么样计算冒口的大小

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冒口的大小怎么计算,我是个初学者,想请教哪位大侠帮助一下
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冒口补缩铸件是有一定的范围——————叫有效补缩距离,设为L,对厚度为h的板状零件通常L=3~5h 。

对棒状零件L=(25~30)√h 式子中,h——————铸件厚度
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