The results of simulation indicate that there is a critical value for ventilation direction to transfer sheet cavity into supercavity.
计算结果表明：在通气空泡的形成过程中，通气方向角存在着一个临界值，使得空泡形态由片状空泡过渡到超空泡；
In sheet metal, drawing is a process of forming flat sheet metal into hollow shapes by mean of a punch that causes the metal to flow into the die cavity.
在板金上，拉伸是一个通过冲床将平板金属冲入模腔拉成中空形状工件的工艺过程。
In sheet metal, drawing is a process of forming flat sheet metal into hollow shapes by mean of a punch that causes the metal to flow into the die cavity.
在板金上，拉伸是一个通过冲床将平板金属冲入模腔拉成中空形状工件的工艺过程。
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