在精确曲面模型对零件表面的表示是准确的这一理论基础上完成了刀位的准确计算，改变了过去刀位数据的生成是在近似模型的基础上完成的状态研究并重新构造了精确曲面裁剪模型的数据结构、裁剪原理．提出了基于参数域的刀位规划和基于实空间的刀位规划概念．并构造了一个基于精确曲面裁剪模型的刀位生成方法库． On the basis of the theory that the accurate surface model is accurate on the surface of the part, the accurate calculation of the tool position is completed, and the generation of the tool position data in the past is a state study completed on the basis of the approximate model and the exact surface is reconstructed. Cutting model data structure, cutting principle. The tool-space planning based on parameter domain and the tool-space planning concept based on real space are proposed. And a tool library generation method library based on the exact surface cutting model was constructed.