Self-adjustment computing method for time-partition interpolation in motion trajectory control of CNC machine tools |
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Authors: | Yi-Hong Long Wei Wu Zu-De Zhou |
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Affiliation: | (1) School of Information Engineering, Wuhan University of Technology, Jianhu Campus, 430070 Wuhan, People’s Republic of China |
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Abstract: | For time-partition interpolation in computer numerical control of the motion trajectory of a machine tool, the trajectory
in a sampling cycle is approximated by a line segment from the current position of the tool to another on the expected trajectory;
and locating the terminal of the line is the goal of the interpolation. In this paper, a self-adjustment computing method
applicable to any explicit curve type is proposed. With the method, the terminal of the linear moving path in a cycle is first
estimated by the motion information in the previous cycle, then adjusted according to the ratio of the desired moving distance
to the computed linear path length. The result of the computation is fairly accurate, and it can be further enhanced with
more adjustments performed in a sampling cycle, which is demonstrated in the simulation results. Furthermore, an adaptive
feedrate adjustment algorithm is also introduced to enable the proposed method to control the trajectory contour errors. |
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Keywords: | Computer numerical control Time-partition interpolation Motion trajectory control Trajectory contour error |
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