Proceedings of the
9th International Conference of Nanomanufacturing (nanoMan2024)
December 1 – 4, 2024, Singapore

Investigation on Bolt Tightening Strategy for Precision Machine Tool Guideway Considering Linear Accuracy

Tianxiang Wang1,2, Yanming Pan 3, Jianfeng Li1,2 and Song Zhang1,2,a

1Key Laboratory for High Efficiency and Clean Mechanical Manufacture of Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan, PR China.

2Key National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan, PR China
3Shandong Pulute Machine Tool Co., Ltd., Tengzhou, PR China

ABSTRACT

Guideway is an essential component in machine tools which affects the accuracy and performance. The uneven deformation of the guideway during assembly can have a direct impact on the linear accuracy of machine tools. This effect is especially significant in in precision machine tools used for high-precision fields such as micro/nano manufacturing. Bolt tightening is an essential step in guideway assembly, where the large-scale group bolts tightening must ensure the linear accuracy of the guideway. The objective of this present research is to evaluate various bolt tightening strategies, explore bolt tightening strategies which offer both strong connection performance and high linear accuracy, thereby enhancing the machining precision of precision machine tools. First, finite element simulations modeled three different tightening strategies for the guideway, determining the straightness error and analyzing the influence of bolt preload and its uniformity on this error. Then, an experimental setup mimicking real machine tool specifications was created to validate the simulation's accuracy through practical assembly. Finaly, the findings indicate that uniform bolt preload is critical for guideway linear accuracy. The crosstightening strategy not only ensures robust connection strength but also enhances linear motion precision. This research offers practical application references for guideway assembly and machine tool manufacturing, contributing to the enhancement of machining precision and assembly efficiency, and providing equipment support and precision assurance for micro/nano manufacturing.

Keywords: Precision machine tools, Guideway, Bolt tightening, Linear accuracy.


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