摘要
将画法几何学中的投影面变换、旋转变换和仿射变换应用于工程设计和制造。用形、数结合的方法解决机械加工、刀具设计与磨削、零件设计中的角度问题，可以得到最佳的结果。
This paper explains how to apply projective transformation, turning transformation and affine transformation to engineering design and production. The best result will be obtained if the problems of angles in mechanical working,tool design and grinding,and part design are solved by means of combination of figures with numbers.
关键词
画法几何学
机械加工
刀具设计
工程设计
Descriptive geometry Mechanical working Tool design Part design
