A Digital Robust Controller for Cutting Force Control in the End Milling Process

[+] Author and Article Information
S. J. Rober, Y. C. Shin, O. D. I. Nwokah

School of Mechanical Engineering, Purdue University, West Lafayette, IN 47967-1288

J. Dyn. Sys., Meas., Control 119(2), 146-152 (Jun 01, 1997) (7 pages) doi:10.1115/1.2801226 History: Received July 11, 1994; Online December 03, 2007


In this work, a digital robust controller is designed via Quantitative Feedback Theory (QFT) to maintain a constant cutting force in the presence of parametric uncertainty for a time varying end milling process. The QFT controller is designed using the delta transform method for discrete systems. The controller is designed to limit the overshoot and settling time of the cutting force levels over a range of cutting parameters. Models are presented for the cutting process and machine dynamics including parametric uncertainty, and these models are used to develop a controller which meets given tracking and regulation specifications for all plant values. Experimental results are obtained by implementing the controller on a milling machine.

Copyright © 1997 by The American Society of Mechanical Engineers
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