关键词: 分片建模, 环形刀, 曲面特征, 刀具姿态, 刀具路径

Abstract: Fragmentation method is applied to create model of complicated parametric surface and in consequence，surface feature is analyzed.On the basis of the geometrically universal characteristic of torus end-mill tool，the precision error of the track is analyzed and the tool path generation algorithm on occasion of iso-scallop is given.Then the fair of the pieces is processed.According to this algorithm，tool-pose changes along with the curvature of machining surface，which leads to the improvement of machining quality as well as the prevention of interference between workpiece and tool.

Key words: fragmentary modeling, torus end-mill, surface feature, tool pose, tool path