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论文类型：期刊论文

发表时间：2013-10-01

发表刊物：JOURNAL OF SYSTEMS SCIENCE & COMPLEXITY

收录刊物：SCIE、EI、CSCD、Scopus

卷号：26

期号：5

页面范围：757-776

ISSN号：1009-6124

关键字：Feedrate interpolation; five-axis machining; NURBS; tool path

摘要：Variable feedrate interpolation algorithms for five-axis parametric toolpath are very promising but still rather limited currently. In this paper, an off-line feedrate scheduling method of dual NURBS curve is presented with geometric and kinematical constraints. For a given dual parametric curve, the feedrates of sampling points are first scheduled sequent with confined feedrate of cutter tip and machine pivot, chord error, normal acceleration and angular feedrate. Then, the feedrate profiles of angular feed acceleration sensitive regions of the path are adjusted using a bi-directional scanning algorithm. After that, a linear programming method is used to adjust the feedrate profiles of linear feed acceleration sensitive regions and control the linear feed acceleration of both cutter tip and machine pivot within preset values. Further, a NURBS curve is used to fit the feedrates of sampling points. Finally, illustrative examples are carried out to validate the feasibility of the proposed feedrate scheduling method. The results show that the proposed method has the ability of effectively controlling the angular feed characters of cutter axis as well as the chord error and linear feed characters of cutter tip and machine pivot, and it has potential to be used in high accuracy and high quality five-axis machining.