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Gorka Agirre, doctor engineer in Precision engineering research group of IDEKO, presented on the 20th of April a strategy for compensating thermal error in machine tool. This strategy is based on the optimal positioning of the temperature sensors.
Thermal
errors represent one of the main error sources affecting machine tool accuracy.
Software error compensation is a practical approach to reduce the influence of
thermal errors by estimating in real time in the machine control the thermal
error that the machine is suffering.
The usual approach is to measure
temperature at some key points of the structure and implement a machine model
that can estimate thermal growth from the measured temperatures. Selecting the
optimal positions where the probes are mounted is critical for the accuracy, robustness
and implementation cost of the solution. In this work, a strategy for selecting
the position of the probes based on finite element simulations is presented. It
involves the use of modal information of the system and looks for orthogonality
of the modes at the selected temperature positions.
The presented method is demonstrated
by applying it to a simplified machine tool model simulated in finite elements,
and models based on proper orthogonal decomposition are obtained and validated
on different test cases.
The 2nd International Conference on Thermal Issues in Machine Tools took place completely on-line due to Covid-19 pandemic situation.
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