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Automatic press-fit assembly of small precision interference fitting parts: armature of electro-hydraulic servo valve

Xingyuan Wang (Key Laboratory for Micro/Nano Technology and System of Liaoning Province, Dalian University of Technology, Dalian, China)
Zhifeng Lou (Key Laboratory for Micro/Nano Technology and System of Liaoning Province, Dalian University of Technology, Dalian, China)
Xiaodong Wang (Key Laboratory for Micro/Nano Technology and System of Liaoning Province, Dalian University of Technology, Dalian, China and Key Laboratory for Precision and Non-traditional Machining of Ministry of Education, Dalian University of Technology, Dalian, China)
Yue Wang (Key Laboratory for Micro/Nano Technology and System of Liaoning Province, Dalian University of Technology, Dalian, China)
Xiupeng Hao (Key Laboratory for Micro/Nano Technology and System of Liaoning Province, Dalian University of Technology, Dalian, China)
Zhize Wang (Key Laboratory for Micro/Nano Technology and System of Liaoning Province, Dalian University of Technology, Dalian, China)

Assembly Automation

ISSN: 0144-5154

Article publication date: 2 September 2019

Issue publication date: 18 October 2019

237

Abstract

Purpose

The purpose of this paper is to design an automatic press-fit instrument to realize precision assembly and connection quality assessment of a small interference fitting parts, armature.

Design/methodology/approach

In this paper, an automatic press-fit instrument was developed for the technical problems of reliable clamping and positioning of the armature, automatic measurement and adjustment of the attitude and evaluation of the connection quality. To compensate for the installation error of the equipment, corresponding calibration method was proposed for each module of the instrument. Assembly strategies of axial displacement and perpendicularity were also proposed to ensure the assembly accuracy. A theoretical model was built to calculate the resistant force generated by the non-contact regions and then combined with the thick-walled cylinder theory to predict the press-fit curve.

Findings

The calibration method and assembly strategy proposed in this paper enable the press-fit instrument to achieve good alignment and assembly accuracy. A reasonable range of press-fit curve obtained from theoretical model can achieve the connection quality assessment.

Practical implications

This instrument has been used in an armature assembly project. The practical results show that this instrument can assemble the armature components with complex structures automatically, accurately, in high-efficiency and in high quality.

Originality/value

This paper provides a technical method to improve the assembly quality of small precision interference fitting parts and provides certain methodological guidelines for precision peg-in-hole assembly.

Keywords

Acknowledgements

This research work was supported by National Science and Technology Major Project of China (Grant No. 2013ZX0400109) and Major Project of Basic Scientific Research of Chinese Ministry (Grant No. JCYK2016 205A003).

Citation

Wang, X., Lou, Z., Wang, X., Wang, Y., Hao, X. and Wang, Z. (2019), "Automatic press-fit assembly of small precision interference fitting parts: armature of electro-hydraulic servo valve", Assembly Automation, Vol. 39 No. 5, pp. 986-998. https://doi.org/10.1108/AA-08-2018-112

Publisher

:

Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited

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