The reason of volume change in metal-forming processes simulation is discussed. Volume change for deformation and spin is quantitatively estimated. It is suggested how the problem could be solved.

• 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。