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TECHNICAL BRIEFS

Fuzzy Control of Spindle Torque in High-Speed Milling Processes

[+] Author and Article Information
Rodolfo Haber-Guerra

 Instituto de Automática Industrial (CSIC), km. 22800 N-III, La Proveda, 28500 Madrid, Spain

Steven Y. Liang

The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 801 Ferst Drive, N.W., Atlanta, GA 30332-0405

José R. Alique

 Instituto de Automática Industrial (CSIC), km. 22800 N-III, La Proveda, 28500 Madrid, Spain

Rodolfo Haber-Haber

 Universidad de Oriente, Ave. Americas s/n., Santiago de Cuba, 90400 Cuba

J. Manuf. Sci. Eng 128(4), 1014-1018 (Feb 14, 2006) (5 pages) doi:10.1115/1.2194063 History: Received August 19, 2005; Revised February 14, 2006

This paper presents the design and implementation of a two-input/two-output fuzzy logic-based torque control system embedded in an open architecture computer numerical control (CNC) for optimizing the material removal rate in high-speed milling processes. The control system adjusts the feed rate and spindle speed simultaneously as needed to regulate the cutting torque using the CNC’s own resources. The control system consists of a two-input (i.e., torque error and change of error), two-output (i.e., feed rate and spindle speed increment) fuzzy controller, which is embedded within the kernel of a standard open control. Two approaches are tested, and their performance is assessed using several performance measurements. These approaches are a two-input/two-output fuzzy controller and a single-output (i.e., feed rate modification only) fuzzy controller. The results demonstrate that the proposed control strategy provides better accuracy and machining cycle time than other strategies, thus increasing the metal removal rate.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Fuzzy partitions and membership functions for (a) ΔTq, Δ2Tq, (b) Δf, and (c) Δs

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Figure 2

Fuzzy control surfaces for (a) feed rate, (b) spindle speed

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Figure 3

Control system diagram

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Figure 4

(a) Tool, (b) profile of the workpiece, (c) research laboratory

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Figure 5

(a) Behavior of torque signal, (b) behavior of feed rate and spindle speed control signals

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