Journal
INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE
Volume 74, Issue -, Pages 1-11Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijmachtools.2013.07.003
Keywords
Five-axis; Tracking error; Contour error; Compensation
Funding
- National Key Basic Research Project of China [2011CB302400]
- National Science and Engineering Research Council of Canada under Strategic Canadian Network Grant in Machining Research (NSERC CANRIMT)
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This paper presents an analytical prediction and compensation of contouring errors in five-axis machining of splined tool paths. The position commands are first fitted to piecewise quintic splines while respecting velocity, acceleration and jerk continuity at the spline joints. The transfer function of each servo drive is kept linear by compensating the disturbance effect of friction with a feed-forward block. Using the analytically represented five-axis, splined tool path, splined tracking errors and kinematic model of the five-axis machine tool, contouring errors are predicted ahead of axis control loops. The contouring errors are decoupled into three linear and two rotary drives, and the position commands are modified before they are sent to servo drives for execution. The proposed method has been experimentally demonstrated to show significant improvement in the accuracy of contouring five-axis tool paths. (C) 2013 Elsevier Ltd. All rights reserved.
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