Coaxiality Evaluation Method of Shaft Parts for Double Least Material Requirements

doi:10.3901/JME.2022.09.231

Abstract

Abstract: If the least material requirement (LMR) is applied to the tolerances feature and datum of coaxiality tolerance at the same time, it is called double least material requirement coaxiality (DLMR coaxiality). DLMR coaxiality can ensure the overall assembly accuracy of the stepped shaft and reduce the manufacturing cost, but the lack of accurate error model makes it difficult to accurately be evaluated. Therefore, the error evaluation method of DLMR coaxiality is investigated. The tolerance requirements and evaluation characteristics of DLMR coaxiality is analyzed, and an adaptive virtual gauge with expandable boundary is established. The geometric structure and motion process of the adaptive virtual gauge is analyzed, and the comprehensive error of the actual part is evaluated through the motion of the adaptive virtual gauge and the actual part. The calculation method of the adaptive virtual gauge is analyzed, and the accuracy of the adaptive virtual gauge method is improved by "repositioning". Finally, an application of the proposed method in stepped shaft evaluation is given.

Key words: error evaluation, least material requirement, datum, coaxiality

CLC Number:

TH161

QIN Ling, HUANG Meifa, TANG Zhemin, ZHONG Yanru, QIN Yuchu, LIU Tingwei. Coaxiality Evaluation Method of Shaft Parts for Double Least Material Requirements[J]. Journal of Mechanical Engineering, 2022, 58(9): 231-243.

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