A Control System for Chatter Avoidance by Ramping the Spindle Speed

Author:

Soliman E.1,Ismail F.1

Affiliation:

1. Department of Mechanical Engineering, Waterloo, Ontario N2L 3G1 Canada

Abstract

This paper presents a new control system for chatter avoidance in milling. The control system monitors the cutting process using a statistical indicator named the R-value which is computed from the cutting force signal. When chatter is detected, the control system ramps the spindle speed in search of a speed at which chatter ceases. The system does not involve time consuming computations and therefore is suitable for on-line implementation. Also, it does not interrupt the cutting process by halting the feedrate or the spindle speed. Simulations showed that the control system has a significant chatter avoidance potential in the high speed range, and also for partial and full immersion cuts. The system was implemented successfully to avoid chatter in slotting and half immersion down milling.

Publisher

ASME International

Subject

Industrial and Manufacturing Engineering,Computer Science Applications,Mechanical Engineering,Control and Systems Engineering

Reference14 articles.

1. Ward, T. L., Bronner, J. E., Ralston, P. A. S., Dressman, J. B., and Hunt, W. P., Sep. 1988, “Sensors for Expert Control of Metal Cutting on Lathe,” 1988 Symposium on Advanced Machining, pp. 37–40.

2. Tlusty J. , and AndrewsG. C., 1983, “A Critical Review of Sensors for Unmanned Machining,” Annals of the CIRP, Vol. 32, No. 2, pp. 563–572.

3. Delio T. , TlustyJ., and SmithS., 1992, “Use of Audio Signals for Chatter Detection and Control,” ASME JOURNAL OF ENGINEERING FOR INDUSTRY, Vol. 114, pp. 146–157.

4. Soliman, E., and Ismail, F., 1996, “Statistical Evaluation of Different Signals for Chatter Detection,” CSME Forum, Hamilton, ON, pp. 148–153.

5. Altintas Y. , and ChanP. K., 1992, “In Process Detection and Suppression of Chatter in Milling,” International Journal of Machine Tools and Manufacture, Vol. 32, No. 3, pp. 329–347.

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