Dr. Tongqun Ren Profile

Dr. Tongqun Ren

at Dalian Univ of Technology

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Proceedings Article | 7 March 2019 Paper

The measurement technology for precision peg-in-hole assembly

Xiaodong Wang, Xingyuan Wang, Tongqun Ren, Yue Wang, Zhifeng Lou, Yi Luo

Proceedings Volume 11053, 110530S (2019) https://doi.org/10.1117/12.2512439

KEYWORDS: Assembly equipment, Ultrasonics, Calibration, Precision measurement, Optical alignment

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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.

Proceedings Article | 7 March 2019 Paper

The internal air gap measurement equipment for dynamic pressure motor

Tongqun Ren, Bo Qin, Xiangdong Xu, Zhirou Liu, Xiaodong Wang

Proceedings Volume 11053, 110534P (2019) https://doi.org/10.1117/12.2517302

KEYWORDS: Transducers, Motion measurement, Control systems, Motion controllers, Data acquisition, Actuators, Magnetism, Gyroscopes, Reliability, Space operations

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The size of internal air gap of dynamic pressure motor is an important index to determine its performance and running stability. In order to improve the precision and automation degree of the internal air gap measurement for dynamic pressure motor, an automatic measurement equipment was developed based on modular design concept. The equipment was mainly composed of clamping module, automatic forcing module, and displacement measurement module. During measurement, the stator was mounted by clamping module with a flexible support at two ends. Then an external force was loaded by forcing module, which was a 3-D electric precision motion platform integrating one triaxial force transducer. A relative displacement was generated because of the internal air gap. And the relative displacement increased until the rotor and stator touched each other. Thus the air gap was transformed into an external micro displacement. Finally, the displacement was measured by measurement module, a 2-D precision motion platform integrating double inductive probes, with relative measurement principle. Experimental results showed that the measurement accuracy was about 0.2μm.

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