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Effect of Supply Cooling Oil Temperature in Structural Cooling Channels on the Positioning Accuracy of Machine Tools

Published online by Cambridge University Press:  04 November 2019

K.-Y. Li ,
W.-J. Luo ,
M.-H. Yang ,
X.-H. Hong ,
S.-J. Luo  and
C.-N. Chen
K.-Y. Li
Affiliation:
Graduate Institute of Precision ManufacturingNational Chin-Yi University of Technology Taichung City, Taiwan Intelligent Machinery Technology CenterIndustrial Technology Research Institute Taichung City, Taiwan
W.-J. Luo*
Affiliation:
Graduate Institute of Precision ManufacturingNational Chin-Yi University of Technology Taichung City, Taiwan
M.-H. Yang
Affiliation:
Department of Refrigeration, Air-Conditioning and Energy EngineeringNational Chin-Yi University of Technology Taichung City, Taiwan
X.-H. Hong
Affiliation:
Department of Refrigeration, Air-Conditioning and Energy EngineeringNational Chin-Yi University of Technology Taichung City, Taiwan
S.-J. Luo
Affiliation:
Intelligent Machinery Technology CenterIndustrial Technology Research Institute Taichung City, Taiwan
C.-N. Chen
Affiliation:
Department of PhysicsTamkang University New Taipei City, Taiwan
*
*Corresponding author (wjluo@ncut.edu.tw)
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Abstract

In this study, the thermal deformation of a machine tool structure due to the heat generated during operation was analyzed, and embedded cooling channels were applied to exchange the heat generated during the operation to achieve thermal error suppression. Then, the finite volume method was used to simulate the effect of cooling oil temperature on thermal deformation, and the effect of thermal suppression was experimentally studied using a feed system combined with a cooler to improve the positioning accuracy of the machine tool. In this study, the supply oil temperature in the structural cooling channels was found to significantly affect the position accuracy of the moving table and moving carrier. If the supply oil temperature in the cooling channels is consistent with the operational ambient temperature, the position accuracy of the moving table in the Y direction and the moving carrier in the X and Z directions has the best performance under different feed rates. From the thermal suppression experiments of the embedded cooling channels, the positioning accuracy of the feed system can be improved by approximately 25.5 % during the dynamic feeding process. Furthermore, when the hydrostatic guideway is cooled and dynamic feeding is conducted, positioning accuracy can be improved by up to 47.8 %. The machining accuracy can be improved by approximately 60 % on average by using the embedded cooling channels in this study. Therefore, thermal suppression by the cooling channels in this study can not only effectively improve the positioning accuracy but also enhance machining accuracy, proving that the method is effective for enhancing machine tool accuracy.

Keywords

Thermal deformationThermal suppressionStructure coolingOil temperature
Type
Research Article
Information
Journal of Mechanics , Volume 35 , Issue 6 , December 2019 , pp. 887 - 900
Copyright
© The Society of Theoretical and Applied Mechanics 2019 

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