Pre-Compensation for Continuous-Path Running Trajectory Error in High-Speed Machining of Parts with Varied Curvature Features

Parts with varied curvature features play increasingly critical roles in engineering, and are often machined under high-speed continuous-path running mode to ensure the machining efficiency. However, the continuous-path running trajectory error is significant during high-feed-speed machining, which...

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Bibliographic Details
Published in:	Chinese journal of mechanical engineering 2017, Vol.30 (1), p.37-45
Main Authors:	Jia, Zhenyuan, Song, Dening, Ma, Jianwei, Gao, Yuanyuan
Format:	Article
Language:	eng
Subjects:	Compensation Curvature Efficiency Electrical Machines and Networks Electronics and Microelectronics Engineering Engineering Thermodynamics Error analysis Error compensation Heat and Mass Transfer High speed machining Instrumentation Machines Manufacturing Mechanical Engineering Power Electronics Precision machining Processes Theoretical and Applied Mechanics Trajectory analysis 加工效率加工轨迹变曲率特征零件补偿方法轨迹误差运行轨迹预补偿
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Summary:	Parts with varied curvature features play increasingly critical roles in engineering, and are often machined under high-speed continuous-path running mode to ensure the machining efficiency. However, the continuous-path running trajectory error is significant during high-feed-speed machining, which seriously restricts the machining precision for such parts with varied curvature features. In order to reduce the continuous-path running trajectory error without sacrificing the machining efficiency, a pre-compensation method for the trajectory error is proposed. Based on the formation mechanism of the continuous-path running trajectory error analyzed, this error is estimated in advance by approximating the desired toolpath with spline curves. Then, an iterative error pre-compensation method is presented. By machining with the regenerated toolpath after pre-compensation instead of the uncompensated toolpath, the continuous-path running trajectory error can be effectively decreased without the reduction of the feed speed. To demonstrate the feasibility of the proposed pre-compensation method, a heart curve toolpath that possesses varied curvature features is employed. Experimental results indicate that compared with the uncompensated processing trajectory, the maximum and average machining errors for the pre-compensated processing trajectory are reduced by 67.19% and 82.30%, respectively. An easy to implement solution for high efficiency and high precision machining of the parts with varied curvature features is provided.
ISSN:	1000-9345 2192-8258