自由曲面数控加工刀具轨迹映射算法

Tool Path Mapping Algorithm for Free-form Surface NC Machining

对自由曲面的数控加工,寻求最优的刀具轨迹生成方法至关重要。本文基于开源3D库Open CASCADE(OCC)和编程开发环境Microsoft Visual Studio 2010(VS2010),应用B样条表达的自由曲面,采用“投影法”思想,研究“重用已有相似刀具路径”方法,提出了处理自由曲面的NC刀具轨迹映射算法。为了验证算法的有效性和可行性,实验建立5类自由曲面,启动设计的轨迹映射算法,输出曲面的NC加工轨迹质量可以满足设计要求,实现了刀具轨迹的重用。

For free-form surface NC machining,it is very important to find the best tool path generation method.In this paper,based on the open-source 3D library Open CASCADE(OCC)and the programming development environment Microsoft Visual Studio 2010(VS2010),the free-form surface expressed by b-spline as the object of use,a tool path mapping algorithm for NC machining of free-form surfaces is proposed by research the method of"reusing existing similar tool paths".This algorithm adopts the idea of"projection method".In order to verify the effectiveness and feasibility of the algorithm,the experiment establishes five kinds of free-form surfaces,starts the designed trajectory mapping algorithm,and the quality of NC machining path of output surface can meet the design requirements,the reuse of tool path is realized.