Model-Based Predictive Control of Workpiece Accuracy in Bar Turning

[+] Author and Article Information
A. M. Shawky, M. A. Elbestawi

Department of Mechanical Engineering, McMaster University, Hamilton, Ontario, Canada L8S 4L7

J. Manuf. Sci. Eng 120(1), 57-67 (Feb 01, 1998) (11 pages) doi:10.1115/1.2830111 History: Received August 01, 1995; Revised July 01, 1996; Online January 17, 2008


In this paper a real-time model-based geometric control system is proposed for workpiece accuracy in bar turning. An on-line ultrasonic measurement system that operates in the presence of cutting fluid is employed for workpiece diameter measurement. A state space mechanistic model is used to overcome the delay in the feedback loop. A Kalman Filter is used in a predictor-corrector fashion to update model predictions using on-line measurements. A full state feedback controller with an integral control action is designed and used to manipulate the tool position in real-time for machining error compensation. The performance of the proposed control strategy is evaluated through cutting experiments performed on a CNC turret lathe retrofitted with an open architecture controller.

Copyright © 1998 by The American Society of Mechanical Engineers
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