Adaptive learning control for thermal error compensation of 5-axis machine tools
| Autor: | Florentina Pavliček, Sascha Weikert, Josef Mayr, Kotaro Mori, Konrad Wegener, Philip Blaser |
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| Rok vydání: | 2017 |
| Předmět: |
0209 industrial biotechnology
Engineering business.product_category Adaptive control Orientation (computer vision) business.industry 02 engineering and technology Residual Industrial and Manufacturing Engineering Compensation (engineering) Machine tool 020303 mechanical engineering & transports 020901 industrial engineering & automation 0203 mechanical engineering Machining Hardware and Architecture Control and Systems Engineering Control theory Position (vector) Boundary value problem business Software Simulation |
| Zdroj: | Journal of Manufacturing Systems. 44:302-309 |
| ISSN: | 0278-6125 |
| DOI: | 10.1016/j.jmsy.2017.04.011 |
| Popis: | The research presented in this paper shows an adaptive approach for long-term thermal error compensation of 5-axis machine tools (MT). A system of differential equations is used to compute the model based compensation values. The model can predict thermal displacements of the tool center point (TCP) based on changes in the environmental temperature, load-dependent changes and boundary condition changes and states, like machining with or without cutting fluid. The model based compensation of the rotary axis of a 5-axis MT is then extended by on-machine measurements. The information gained by the process-intermittent probing is used to adaptively update the model parameters, so that the model learns how to predict thermal position and orientation errors and to maintain a small residual error of the thermally induced errors of the rotary axis over a long time. This approach not only increases the MT accuracy but also reduces the amount of time spent on preproduction model parameter identification. Additionally an algorithm has been developed to dynamically adjust the length of the on-machine measurement intervals to maintain a high productivity and a constant deviation of the machined parts. Experimental results confirm that the adaptive learning control (ALC) for thermal errors shows a desirable long-term prediction accuracy. |
| Databáze: | OpenAIRE |
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