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The measurement technology for precision peg-in-hole assembly
Author(s): Xiaodong Wang; Xingyuan Wang; Tongqun Ren; Yue Wang; Zhifeng Lou; Yi Luo
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Paper Abstract

Measurement is the prerequisite technology for assembling precise devices in order to guarantee the quality requirements. As a typical category of assembly, peg-in-hole is the most widely employed assembly method in industrial fields, including precision instruments and machinery. Some of the measurement problems and solutions of two major categories of the peg-in-hole assembly, i.e. clearance fits and interference fits, were discussed. The parts to be assembled are small in size. The precision clearance fits require mating surfaces to avoid collisions during assembly; for the precision interference fits, the mating surfaces should not be damaged or generating abrasive chips during press-fit. The hole-shaft alignment and attitude adjustment are the main task need to be carried out precisely in assembly. Furthermore, real-time monitoring and connection strength measurement is also the important for interference fit assembly. Therefore, the purpose of this paper is to achieve precise hole-shaft alignment and attitude adjustment of these two kinds of fits and to real-time monitor the assembly process, as well as connection strength assessment of the interference fit. Two assembly instruments were built for interference fits and clearance fits to achieve precise alignment, attitude adjustment, and real-time monitoring. In addition, an ultrasonic testing apparatus was built to evaluate the connection strength. After calibration, the precision press-fit instrument can achieve high assembly accuracy and demonstrated with experiments. The prediction results of connection strength are in good agreement with experimental results with a relative error less than 20%. Furthermore, the instrument for clearance fits was also designed and introduced.

Paper Details

Date Published: 7 March 2019
PDF: 11 pages
Proc. SPIE 11053, Tenth International Symposium on Precision Engineering Measurements and Instrumentation, 110530S (7 March 2019); doi: 10.1117/12.2512439
Show Author Affiliations
Xiaodong Wang, Dalian Univ. of Technology (China)
Xingyuan Wang, Dalian Univ. of Technology (China)
Tongqun Ren, Dalian Univ. of Technology (China)
Yue Wang, Dalian Univ. of Technology (China)
Zhifeng Lou, Dalian Univ. of Technology (China)
Yi Luo, Dalian Univ. of Technology (China)

Published in SPIE Proceedings Vol. 11053:
Tenth International Symposium on Precision Engineering Measurements and Instrumentation
Jiubin Tan; Jie Lin, Editor(s)

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