改善机床运动的五轴刀轨光顺方法

李晓东; 宁涛; 陈志同

doi:10.13700/j.bh.1001-5965.2015.0138

改善机床运动的五轴刀轨光顺方法

doi: 10.13700/j.bh.1001-5965.2015.0138

北京航空航天大学机械工程及自动化学院, 北京 100083

基金项目: 国家重大科技专项(2013ZX04011031)

详细信息

作者简介:
李晓东男,硕士研究生。主要研究方向:五轴数控加工刀轨光顺技术。Tel.:18512437740 E-mail:dreamfadesaway@126.com;宁涛男,博士,副教授,硕士生导师。主要研究方向:CAD、CAM技术。Tel.:13910819741 E-mail:ningtao@buaa.edu.cn;陈志同男,博士,教授,博士生导师。主要研究方向:先进数控加工技术与装备。Tel.:13641199699 E-mail:ztchen@sina.com

通讯作者:
宁涛,Tel.:13910819741 E-mail:ningtao@buaa.edu.cn

中图分类号: TP391
计量
- 文章访问数: 935
- HTML全文浏览量: 10
- PDF下载量: 483
- 被引次数: 0
出版历程
- 收稿日期: 2015-03-13
- 网络出版日期: 2016-02-20

5-axis tool path smoothing to improve machine tool motion

School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

摘要

摘要: 建立了五轴数控加工刀轨光顺优化模型,改善了线性插补方式下拐角过渡运动中的机床加速度情况。考虑了5个轴加速能力的差异,以轴加速度比,即轴实际达到的最大加速度与其允许最大加速度的比值,来衡量轴的加速度情况,以5个轴加速度比的平方平均数在整体上衡量机床的加速度情况,降低该值可提高机床运动平稳性。采用最短距离线法在初始刀轨的各切触点处建立了刀轴偏航角和俯仰角的可行域,使光顺后的刀轨满足残高和无过切要求。实例表明:该方法可有效光顺五轴数控加工刀轨,改善机床加速度情况,提高机床运动平稳性。
- 五轴数控加工 /
- 刀轨光顺 /
- 拐角过渡运动 /
- 加速度比 /
- 最短距离线法
Abstract: An optimization model of tool path smoothing in 5-axis CNC machining is built to improve the machine tool acceleration condition in the tool path corner transition motion in linear interpolation. Considering the difference of the five axis acceleration abilities, the ratio of one axis' maximal acceleration in corner transition motion and its allowed maximal acceleration is used to evaluate its acceleration condition, and the root-mean-square value of the five axis acceleration ratios is used to evaluate the machine tool acceleration condition, decreasing which can increase the stability of machine tool motion. The shortest lines method is used to build an admissible domain for tool axis tilt and yaw angles at each cutter contact point in the initial tool path in order to make the tool path respect the cusp height and no gouging constraints after smoothing. An example is given to demonstrate the feasibility of this method in improving the machine tool acceleration condition and increasing the stability of machine tool motion by smoothing the tool path.
- 5-axis CNC machining /
- tool path smoothing /
- corner transition motion /
- acceleration ratio /
- the shortest lines method

HTML全文

参考文献(15)

[1]	HO M C,HWANG Y R,HU C H.Five-axis tool orientation smoothing using quaternion interpolation algorithm[J].International Journal of Machine Tools and Manufacture,2003,43(12):1259-1267.
[2]	JUN C S,CHA K,LEE Y S.Optimizing tool orientations for 5-axis machining by configuration-space search method[J].Computer-Aided Design,2003,35(6):549-566.
[3]	毕庆贞,王宇晗,朱利民,等.刀触点网格上整体光顺五轴数控加工刀轴方向的模型与算法[J].中国科学:技术科学,2010,40(10):1159-1168. BI Q Z,WANG Y H,ZHU L M,et al.Wholly smoothing cutter orientations for five-axis NC machining based on cutter contact point mesh[J].Science China:Technological Science,2010,40(10):1159-1168(in Chinese).
[4]	WANG N,TANG K.Automatic generation of gouge-free and angular-velocity-compliant five-axis toolpath[J].Computer-Aided Design,2007,39(10):841-852.
[5]	王晶,张定华,罗明,等.复杂曲面零件五轴加工刀轴整体优化方法[J].航空学报,2013,34(6):1452-1462. WANG J,ZHANG D H,LUO M,et al.A global tool orientation optimization method for five-axis CNC machining of sculptured surfaces[J].Acta Aeronautica et Astronautica Sinica,2013,34(6):1452-1462(in Chinese).
[6]	CASTAGNETTI C,DUC E,RAY P.The domain of admissible orientation concept:A new method for five-axis tool path optimisation[J].Computer-Aided Design,2008,40(9):938-950.
[7]	罗明,吴宝海,李山,等.自由曲面五轴加工刀轴矢量的运动学优化方法[J].机械工程学报,2009,45(9):158-163. LUO M,WU B H,LI S,et al.Five-axis tool orientation optimization based on kinematic method[J].Journal of Mechanical Engineering,2009,45(9):158-163(in Chinese).
[8]	HU P C,TANG K.Improving the dynamics of five-axis machining through optimization of workpiece setup and tool orientations[J].Computer-Aided Design,2011,43(12):1693-1706.
[9]	LAVERNHE S,TOURNIER C,LARTIGUE C.Optimization of 5-axis high-speed machining using a surface based approach[J].Computer-Aided Design,2008,40(10-11):1015-1023.
[10]	BEUDAERT X,PECHARD P Y,TOURNIER C.5-axis tool path smoothing based on drive constraints[J].International Journal of Machine Tools and Manufacture,2011,51(12):958-965.
[11]	LEE Y S.Non-isoparametric tool path planning by machining strip evaluation for 5-axis sculptured surface machining[J].Computer-Aided Design,1998,30(7):559-570.
[12]	徐汝峰.宽行加工刀位误差求解与刀轨规划技术研究[D].北京:北京航空航天大学,2010:37-48. XU R F.Research on tool position error calculation and tool path planning methods in 5-axis machining of sculptured surfaces[D].Beijing:Beihang University,2010:37-48(in Chinese).
[13]	陈志同,乐毅,徐汝峰.中点误差控制宽行加工算法[J].机械工程学报,2011,47(1):117-123. CHEN Z T,YUE Y,XU R F.A middle-point-error-control method for strip-width maximization-method[J].Journal of Mechanical Engineering,2011,47(1):117-123(in Chinese).
[14]	PESSOLES X,LANDON Y,RUBIO W.Kinematic modelling of a 3-axis NC machine tool in linear and circular interpolation[J].International Journal of Advanced Manufacturing Technology,2010,47(5-8):639-655.
[15]	PESSOLES X,REDONNET J M,SEGONDS S,et al.Modelling and optimising the passage of tangency discontinuities in NC linear paths[J].International Journal of Advanced Manufacturing Technology,2012,58(5-8):631-642.