Abstract
To ensure the precise relative position between two adjacent parts, multiple pins (10, or even more) are usually set on the parts for positioning. In this case, whether the two adjacent parts can be assembled, and the consequent positioning error is unknown, which might cause a failure in the reasonable selection of parts in the assembly stage, and the reasonable design of relevant parameters (such as the diameters of pins and pinholes, and positional tolerances) in the design stage. In this study, considering the positional tolerance of the pinhole as well as the diameter tolerance of the pin and pinhole, the mathematical model of the accuracy of multi-pin positioning was established, and determined by optimization, obtaining the positioning error. The related assembly experiments were conducted. The measurement results were all in the range of mathematical calculation with the measured data, indicating that the proposed method is effective, and it can provide a direct basis for the part selection in the assembly stage, and the tolerance design in the design stage.
Highlights
Engineers usually set pinholes on surfaces to ensure the positioning accuracy of two assembling parts
The error of multi-pin positioning can be represented by the eccentricity on the assembly joint surface of the two adjacent parts
The results showed that the greater the positional tolerance, the wider the distribution of the maximum eccentricity
Summary
This work was supported in part by the National Natural Science Foundation under Grant U1737207, in part by the National Defense Basic Scientific Research Program under Grant JCKY2018203A002, and in part by the Ministry of Industry and Information Technology of China under Grant JSZL2016204B102.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
