裁剪NURBS组合曲面的数控加工算法研究

从工程应用角度出发，结合国产化ＣＡＤ／ＣＡＭ系统开发的需要，提出了一种裁剪ＮＵＲＢＳ组合曲面精加工平截面刀具轨迹的生成算法。在裁剪ＮＵＲＢＳ曲面等距面的生成、平面与裁剪ＮＵＲＢＳ曲面等距面的求交等几何操作算法的基础上计算刀具轨迹；并通过交线的排序和优化进行干涉检查与消除，解决了组合曲面加工编程中曲面之间存在的断开，裂缝，局部搭接现象的刀轨生成问题。

Tool Path Generation of Compound Surfaces based on Trimmed NURBS

To meet the needs for the development of CAD/CAM software, from the view point of engineering application, a compound surface finish machining NC auto programming algorithm is presented in this paper on the basis of geometric operating algorithms of Trimmed NURBS surfaces such as intersecting and offsetting. The tool path can be generated between surfaces while some phenomena of break, gap and overlap between adjacent surface patches being eliminated. Some practical applications of the proposed method are provided.