Control-Oriented Modeling of Thermal Deformation of Machine Tools Based on Inverse Solution of Time-Variant Thermal Loads with Delayed Response
Author:
Fraser S.1, Attia M. H.2, Osman M. O. M.3
Affiliation:
1. Senior Control Systems Engineer, LHP Software LLC, Columbus, Indiana 2. Aerospace Manufacturing Technology Center, Institute for Aerospace Research, National Research Council of Canada/McGill University, Montreal, Quebec, Canada 3. Mechanical Engineering Department, Concordia University, Montreal, Quebec, Canada
Abstract
With the new emerging technologies of high performance machining and the increasing demand for improved machining accuracy in recent years, the problem of thermal deformation of machine tool structures is becoming more critical than ever. The major problem in implementing real-time control systems is the difficulty of measuring the relative thermal displacement between the tool and the workpiece during machining. Therefore, the design of a generic multi-axis control system requires the development of control-based models to estimate the transient thermal load and the thermal deformation of the structure in real-time. To satisfy the stringent accuracy and stability requirements of the control system, a new inverse heat conduction problem IHCP solver is developed. This solution is capable of including the inertia effect and the delay in the thermal response, in order to accommodate situations where the measured points cannot be located near the heat source, which may be buried into the structure. Experimental validation of these models showed their inherent stability even when the temperature measurements are contaminated with random errors. The excellent computational efficiency of the integrated system, which is well suited for real-time control applications involving multi-dimensional structures, was achieved by incorporating an inverse numerical Laplace transformation procedure. The results also showed that the thermal deformation transfer function behaves as low-pass filters, and as such it attenuates the high frequency noise associated with temperature measurement error.
Publisher
ASME International
Subject
Industrial and Manufacturing Engineering,Computer Science Applications,Mechanical Engineering,Control and Systems Engineering
Reference35 articles.
1. Ferreira, P. M., and Liu, C. R., 1993, “A Method for Estimating and Compensating Quasi-static Errors of Machine Tools,” ASME J. Ind., 115, pp. 149–159. 2. Hatamura, Y., Nagao, T., Mitsuishi, M., Kato, K., Taguchi, S., Okumura, T., Nakagawa, G., and Sugishita, H., 1993, “Development of an Intelligent Machining Center Incorporating Active Compensation for Thermal Distortion,” CIRP Ann., 42(1), pp. 549–552. 3. Ni, J., and Wu, S. M., 1993, “An On-line Measurement Technique for Machine Volumetric Error Compensation,” ASME J. Ind., 115, pp. 85–92. 4. Ichimiya, R., Yokoyama, K., and Watanabe, Y., 1976, “Experimental Study on Thermal Deformation of Machine Tool,” Fac. Engrg., Niigata Univ., Report No. 25. 5. Ichimiya, R., 1980, “Compensation for Thermal Deformation of Milling Machine,” Proc. Conf. Numerical Methods in Machine Tool Design, Wroclaw, Poland, pp. 39–49.
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