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In-process measurement of machine structure deformation and compensation of resulting work piece inaccuracies

: Brecher, Christian; Flore, Jakob; Klatte, Michel; Wenzel, Christian

Blunt, L. ; European Society for Precision Engineering and Nanotechnology -EUSPEN-:
Laser metrology and machine performance X : 10th International Conference and Exhibition on Laser Metrology, Machine Tool, CMM & Robotic Performance, Lamdamap 2013. 20 - 21 March 2013, Chicheley Hall, Newport Pagnell, Bucks, Buckinghamshire, UK
Cranfield: Euspen, 2013
ISBN: 978-0-9566790-1-7
International Conference and Exhibition on Laser Metrology, Coordinate Measuring Machine and Machine Tool Performance (LAMDAMAP) <10, 2013, Newport Pagnell>
Fraunhofer IPT ()

This paper focuses on solution approaches in order to compensate work piece inaccuracies due to thermal deformation of metal cutting machine tools. A newly developed concept has been verified, which focuses on the direct measurement of thermo-elastic deformations within the structure of machine tools. The solution approach is to measure deformations of machine components directly with multiple specially designed strain sensors. This information can be utilised with a compensation method in order to correct resulting work piece inaccuracies. Compensation can be achieved with the help of a mathematical model, which is used to predict the overall deviation between work piece and tool. The deviation can then be corrected by applying corrective feed axis motion controlled by the machine controller. In a first verification process different measurement applications and sensors for the direct measurement of deformation have been tested. For this, a simple machine bed geometry, made of polymer concrete, with integrated sensor and heating devices has been built. Different thermo-elastic states like elongation and bending of the bed have been induced. Within test measurements the concept has been verified and the capabilities of different sensors have been evaluated.