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research-article

Prediction of comprehensive thermal error of a preloaded ball screw on a gantry milling machine

[+] Author and Article Information
Kuo Liu

Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China
liukuo@dlut.edu.cn

Haobo Liu

Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China
hbliu@dlut.edu.cn

Te Li

Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China
teli@dlut.edu.cn

Yongqing Wang

Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China
yongqing_wang1969@126.com

Mingjia Sun

State Key Laboratory, Shenyang Machine Tool (Group) CO., LTD. Shenyang 110142, China
sunmingjia001@126.com

Yuliang Wu

State Key Laboratory, Shenyang Machine Tool (Group) CO., LTD. Shenyang 110142, China
wuyuliang198401@126.com

1Corresponding author.

ASME doi:10.1115/1.4037236 History: Received March 05, 2017; Revised June 24, 2017

Abstract

The conception of the comprehensive thermal error of servo axes is given. Thermal characteristics of a preloaded ball screw on a gantry milling machine is investigated, and the error and temperature data are obtained. The comprehensive thermal error is divided into two parts: TEE (thermal expansion error in the stroke range) and TDE (thermal drift error of origin). The thermal mechanism and thermal error variation of preloaded ball screw are expounded. Based on the generation, conduction, and convection theory of heat, the thermal field models of screw caused by friction of screw-nut pairs and bearing blocks are derived. The prediction for TEE is presented based on thermal fields of multi-heat sources. Besides, the influence factors of TDE are analyzed and the model of TDE is established based on least square method. The predicted thermal field of the screw is analyzed. The simulation and experimental results indicate that high accuracy stability can be obtained using the proposed model. Moreover, high accuracy stability can still be achieved even if the moving state of servo axis changes randomly, and the screw is preloaded and the thermal deformation process is complex. Strong robustness of the model is verified.

Copyright (c) 2017 by ASME
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