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《Modular Machine Tool & Automatic Manufacturing Technique》 2011-05
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Five-axis NURBS Interpolation with Controlling Feedrate by Look-ahead Method

HE Guang-qiang1,2,YU Dong2,ZHANG Xiao-hui1,2(1.Graduate University of Chinese Academy of Sciences,Beijing 100039,China;2.Shenyang Institute of Computing Technology,Chinese Academy of Sciences,Shenyang 110171,China)  
A real time look-ahead controlling method is proposed to improve the accuracy of five-axis NURBS interpolation after analysing the affect of the max-feedrate,the max-acceleration and the derivative of curvature.The method has two steps.In the first step,compute the NURBS presentations、the segments information and the expected feedrates.In the second step,using the look-ahead method to adjust the federate dynamically.Using this method the feedrate can be adjusted before the locations of sharp corners and the acceleration won't be changed abruptly.The simulations demonstrate that the proposed method is effective.
【Fund】: “高档数控机床与基础制造装备”国家科技重大专项“总线式全数字高档数控装置”(2009ZX04009-013)
【CateGory Index】: TG659
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