【摘 要】
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This paper proposes a look-ahead interpolation scheme for short line segments.The proposed interpolation method consists of two modules:NURBS fitting and S-curv
【机 构】
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ShenyangInstituteofAutomation,ChineseAcademyofSciences,Shenyang,China;GraduateUniversityoftheChinese
论文部分内容阅读
This paper proposes a look-ahead interpolation scheme for short line segments.The proposed interpolation method consists of two modules:NURBS fitting and S-curve acceleration/deceleration (ACC/DEC) feedrate-planning modules.Depending on the length and the CSB criterion,these linearized segments can be regarded as noise,continuous short blocks (CSBs),or G01 blocks.The junctions are located where the curvature beyond the NURBS setting value or undergoing violent changes and the ending points of the long straight segments(non-CSB).The NURBS fitting module first looks ahead several CSBs and converts them into parametric curves in real-time machining.It can ensure that the position,slope,and curvature at the junctions of the parametric curves,and unfitted line segments are all continuous;Then the acc/dec feedrate-planning module proposes a new algorithm to determine the feedrate at the junction of the fitting curve and unfitted short segments,and the corner feedrate within the fitting curve.Simulations and experiments show that the implemented NURBS cutting can significantly improve machining accuracy and reduce cutting time to satisfy the requirements of todays high-speed and –accuracy machining.
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