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论文类型：期刊论文

发表时间：2006-03-01

发表刊物：INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE

收录刊物：SCIE、EI

卷号：46

期号：3-4

页面范围：235-242

ISSN号：0890-6955

关键字：machining dynamics; CAD/CAM; feedrate schedule; NC machining; toolpath

摘要：Real-time parametric interpolation has played a key role in the computer control of machine tools. To achieve highest quality parts, generated trajectories not only describe the desired toolpath accurately, but also have smooth dynamics profiles. This paper presents a novel parametric interpolator based on guide curve. The relationships between geometric properties and kinematic properties are firstly discussed. Then, with a consideration of the important effect of the curvature of curvilinear path on the machining dynamics, a corresponding formula, which describes the relation of the maximum allowed feed acceleration/deceleration and the maximum allowed rate of change of curvature radius of paths, is built. Thus, based on a near arc parameterization and through modifying the curvature radius curve to deal with corners, key regions and other cases, adaptive feedrate schedule is completed according to the reconstructed smooth curvature radius curve. Consequently, confined chord errors, corners on the path and the acceleration/deceleration capabilities of the machine tool are simultaneously considered and incorporated into the guide curve based parametric interpolation system without using look-ahead scheme. Simulation results indicate the feasibility and precision of the proposed interpolation method. (c) 2005 Elsevier Ltd. All rights reserved.