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https://idr.l4.nitk.ac.in/jspui/handle/123456789/13522
Title: | Variable-feedrate CNC interpolators for constant material removal rates along Pythagorean-hodograph curves |
Authors: | Farouki, R.T. Manjunathaiah, J. Nicholas, D. Yuan, G.-F. Jee, S. |
Issue Date: | 1998 |
Citation: | CAD Computer Aided Design, 1998, Vol.30, 8, pp.631-640 |
Abstract: | An NC system that machines a curved shape at fixed depth of cut experiences time-varying cutting forces due to the 'curvature effect' - the material removal rate is higher than nominal in concave regions, and lower in convex regions. A curvature-dependent feedrate function that automatically compensates for this effect is formulated, and it is shown that, for Pythagorean-hodograph (PH) curves, the periodic real time computation of reference points in accordance with this function can be analytically reduced to a sequence of root-finding problems for simple monotone functions. Empirical results from an implementation of this variable-feedrate interpolators on an open-architecture CNC milling machine are presented and compared with results from fixed-feedrate interpolators. The curvature-compensated feedrate scheme has important potential applications in ensuring part accuracy and in optimizing part programs consistent with a prescribed accuracy. � 1998 Elsevier Science Ltd. All rights reserved. |
URI: | 10.1016/S0010-4485(98)00020-7 http://idr.nitk.ac.in/jspui/handle/123456789/13522 |
Appears in Collections: | 1. Journal Articles |
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