The wearing of the edge can be determined on the directions of cross products.Dimensioning and tolerancing of punch and die are thus automated for computer aided die design.

• 根据两向量的方向来判断该边的磨损变化情况,成功解决了计算机辅助模具设计中凸模和凹模刃口尺寸的自动计算和标注问题。