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Indexed by:会议论文

Date of Publication:2018-01-01

Included Journals:CPCI-S

Page Number:470-476

Key Words:Tracking Error; Contouring Error; High-speed Machining; Error Compensation

Abstract:Parts with complex curved features has been widely applied in areas such as aerospace, energy and power. With the development of these high-end equipment fields, there is an increasingly higher demand for the machining efficiency and precision of such parts. In high-feed-speed numerical control machining of parts with complex curved features, the contouring error is non-ignorable due to the existence of tracking errors for each feed axis caused by servo delay of feed-drive systems, which seriously restricts the machining efficiency and precision of such complex parts. Consequently, a contouring-error reduction approach based on real-time tracking-error compensation is proposed in this paper to improve the machining accuracy of such parts without decreasing of the machining efficiency. According to the transfer functions of the feed-drive systems, the tracking-error compensation values for feed axes are calculated by solving differential equations. After compensation, the tracking error of each feed axis can be dramatically decreased, thus the contouring accuracy in high-feed-speed machining can be effectively improved. Simulation results demonstrate the feasibility of the proposed method. This study is significant for improving the machining efficiency and precision of parts with complex curved surface.