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讨论了在压力加工的数值模拟中造成体积改变的原因，并对因变形及转动引起的体积改变做了定量估计，提出了解决问题的方向。
The reason of volume change in the numerical simulation of pressure processing is discussed. The volume change caused by deformation and rotation is quantitatively estimated, and the direction of solving the problem is proposed.