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IJAT Vol.5 No.1 pp. 4-10
doi: 10.20965/ijat.2011.p0004
(2011)

Paper:

Integral Sliding Mode Control for Fast Tool Servo Diamond Turning of Micro-Structured Surfaces

De Ping Yu, Geok Soon Hong, and Yoke San Wong

Department of Mechanical Engineering, National University of Singapore, 1 Engineering Drive 2, NUS, Singapore 117576, Singapore

Received:
June 11, 2010
Accepted:
September 8, 2010
Published:
January 5, 2011
Keywords:
integral sliding model control, fast tool servo, diamond turning, micro-structured surfaces
Abstract

Fast Tool Servo (FTS) diamond turning is a promising machining process for fabricating high precision micro-structured surfaces. However, the dynamics of FTS affects its performance and causes form error in the machined surfaces, thus shortening the useful bandwidth of the FTS for precision machining. In this paper, an Integral Sliding Mode Control (ISMC) algorithm is proposed to control the FTS in order to achieve the desired closed-loop dynamics. The robustness of the ISMC to disturbance and model uncertainties or variations is ensured by the implementation of disturbance estimation and an integral switching control action. The influence of the FTS dynamics can thereby be minimized by modifying the tool path offline with the inverse of the desired dynamics. Experiments on machining of typical micro-structured surfaces show that the proposed method is effective in reducing the FTS dynamics induced form error in the machined surface.

Cite this article as:
D. Yu, G. Hong, and Y. Wong, “Integral Sliding Mode Control for Fast Tool Servo Diamond Turning of Micro-Structured Surfaces,” Int. J. Automation Technol., Vol.5, No.1, pp. 4-10, 2011.
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