复杂型腔环切拐角过渡刀轨生成技术
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摘要
针对环切刀轨中存在的拐角及残区问题,提出采用三段式Clothiod曲线光滑拼接的方法进行过渡优化。首先,借鉴骨架线提取的原理判断拐角残区并提取出残区步长;然后,在残区步长的基础上,选取过渡控制点和初始插入点作为曲线过渡的特征点;最后,在特征点的约束下,将曲线和直线进行过渡连接,并保证过渡曲线的C2阶连续。仿真加工测试结果表明,该方法能有效切除环切拐角残余并实现刀轨的平稳过渡,同时能很好地缩短加工时间和提高整体的加工质量。
Aiming at the corner and residual problem in Contour-Parallel Offset(CPO)tool path,a three clothiod curves blending method was used to make transition optimization.The skeleton extraction method was taken to compute the corner residual region.Based on residual region,the controlled points and initial connected points were selected as feature points.The clothoid and lines were connected on the constraint of feature points,which were able to keep the transition up to C2 continuous.The experimental results showed that this method could not only clean the residual region and achieve a smooth transition machining effectively,but also minimize the machining time and improve the machining quality.
Aiming at the corner and residual problem in Contour-Parallel Offset(CPO)tool path,a three clothiod curves blending method was used to make transition optimization.The skeleton extraction method was taken to compute the corner residual region.Based on residual region,the controlled points and initial connected points were selected as feature points.The clothoid and lines were connected on the constraint of feature points,which were able to keep the transition up to C2 continuous.The experimental results showed that this method could not only clean the residual region and achieve a smooth transition machining effectively,but also minimize the machining time and improve the machining quality.
引文
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[13]WALTON D J,MEEK D S.A controlled Clothoid Spline[J].Computers&Graphics,2005,29(3):353-363.
[2]ZHAO Z Y,WANG C Y,ZHOU H M,et al.Pocketing toolpath optimization for sharp corners[J].Journal of Materials Processing Technology,2007,192/193:175-180.
[3]PATELOUP V,DUC E,RAY P.Corner optimization for pocket machining[J].International Journal of Machine Tools&Manufacture,2004,44(12/13):1343-1353.
[4]ZHANG Deili,ZHOU Laishui.Adaptive algorithm for feedrate smoothing of high speed machining[J].Acta Aeronautica et Astronautica Sinica,2006,27(1):125-130(in Chinese).[张得礼,周来水.数控加工运动的平滑处理[J].航空学报,2006,27(1):125-130.]
[5]HE Bo,LUO Lei,HU Jun,et al.Smoothing algorithm for high speed machining at corner[J].Journal of Shanghai Jiaotong University,2008,42(1):83-86(in Chinese).[何波,罗磊,胡俊,等.高速数控加工轨迹拐角的速度平滑方法[J].上海交通大学学报,2008,42(1):83-86.]
[6]ZHANG Ming,LIU Weijun,LI Lun.Sharp corner clean-up CPO tool-path generating method for complex pocket[J].Computer Integrated Manufacturing Systems,2011,17(11):2399-2404(in Chinese).[张鸣,刘伟军,李论.复杂型腔环切清角加工刀轨生成方法[J].计算机集成制造系统,2011,17(11):2399-2404.]
[7]CHOY H S,CHAN K W.A corner-looping based tool path for pocket milling[J].Computer-Aided Design,2003,35(2):155-166.
[8]AN Luling,ZHOU Laishui,ZHUANG Haijun,et al.Tool path generation for high-speed milling of pockets[J].Journal of Computer-Aided Design&Computer Graphics,2004,16(9):1202-1206(in Chinese).[安鲁陵,周来水,庄海军,等.型腔高速铣削刀轨生成算法研究[J].计算机辅助设计与图形学学报,2004,16(9):1202-1206.]
[9]WALTON D J,MEEK D S.G1 interpolation with a single cornu spiral segment[J].Journal of Computational and Applied Mathematics,2009,223(1):86-96.
[10]CAO L X,LIU J.Computation of medial axis and offset curves of curved boundaries in planar domain[J].ComputerAided Design,2008,40(4):465-475.
[11]PAMALI A P.Using clothoidal spirals to generate smooth tool paths for high speed machining[D].Raleigh,N.C.,USA:North Carolina State University,2004.
[12]YAO Z Y.Path generation for high speed machining using spiral curves[J].Computer-Aided Design&Applications,2007,4(1-4):191-198.
[13]WALTON D J,MEEK D S.A controlled Clothoid Spline[J].Computers&Graphics,2005,29(3):353-363.