Journal of South China University of Technology(Natural Science Edition) ›› 2012, Vol. 40 ›› Issue (1): 53-57.

• Mechanical Engineering • Previous Articles     Next Articles

B-Spline Curve Fitting of Consecutive Micro-Segment Trajectory in NC Machining

Pi You-guo  Fan De-he   

  1. School of Automation Science and Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2011-06-23 Revised:2011-09-18 Online:2012-01-25 Published:2011-12-01
  • Contact: 皮佑国(1953-) ，男，博士，研究员，主要从事工业自动化及数控系统、嵌入式系统研究． E-mail:auygpi@ scut.edu.cn
  • About author:皮佑国(1953-) ，男，博士，研究员，主要从事工业自动化及数控系统、嵌入式系统研究．
  • Supported by:

    广东省教育部产学研结合项目( 2009B090300269)

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Abstract:

In order to overcome the frequent acceleration and deceleration,low machining feedrate and discontinuous machining path in the traditional consecutive micro-segment machining process,an algorithm of cubic B-spline
curve fitting based on the least square method is proposed to approximate the consecutive micro-segment to a Bspline curve. By analyzing the geometric characteristics of the machining path of the consecutive micro-segment,a chord error constraint based on the arc approximation is presented to pick out appropriate points and keep the deviation of the fitted curve from the original path in a required range. Simulated results indicate that the proposed algorithm can effectively fit consecutive micro-segments into B-spline curves without reducing the precision.

Key words: NC machine tool, B-spline curve fitting, micro-segment, least square method