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Control Method for the Tool Path in Aspherical Surface Grinding and Polishing  

Kim, Hyung-Tae (Research center in AmTechnology)
Yang, Hae-Jeong (Department of Mechanical Design Engineering, Korea Polytechnic University)
Kim, Sung-Chul (Research center in AmTechnology)
Publication Information
International Journal of Precision Engineering and Manufacturing / v.7, no.4, 2006 , pp. 51-56 More about this Journal
Abstract
This paper proposes a control algorithm, which is verified experimentally, for aspherical surface grinding and polishing. The algorithm provides simultaneous control of the position and interpolation of an aspheric curve. The nonlinear formula for the tool position was derived from the aspheric equation and the shape of the tool. The function was partitioned at specific intervals and the control parameters were calculated at each control section. The position, acceleration, and velocity at each interval were updated during the process. A position error feedback was introduced using a rotary encoder. The feedback algorithm corrected the position error by increasing or decreasing the feed speed. In the experimental verification, a two-axis machine was controlled to track an aspherical surface using the proposed algorithm. The effects of the control and process parameters were monitored. The results demonstrated that the maximum tracking error with tuned parameters was at the submicron level for concave and convex surfaces.
Keywords
Aspherical Lens; Grinding Tool Path; Surface Polishing; Nonlinear Curve Interpolation; PC-Based System;
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