Research on High-Precision Measurement Method for the Extension Position of Engine Threaded Holes Based on Threaded Core Shaft

DOI: https://doi.org/10.62517/jes.202602208

Author(s)

Xingang Wang, Zhenyu Zhang, Yingjie Zheng, Xiaojun Liu, Cong Chen, Jiahao Ding

Affiliation(s)

Weichai Power Co., Ltd., Weifang, Shandong State Key Laboratory of Engine and Powertrain System, Weifang, Shandong, China

Abstract

Aiming at the problems of insufficient accuracy and imprecise data acquisition when measuring the extension position of threaded holes with a three-coordinate measuring machine, this paper proposes a new method based on the auxiliary measurement of threaded mandrel. This method converts the internal features of the threaded hole that are difficult to measure directly and precisely into external cylindrical features that are easy to measure with high precision by designing and installing a threaded mandrel that fits precisely with the threaded hole. The article elaborates in detail on the structural design principle, measurement process and key precautions of the threaded mandrel. The experimental results show that the thread mandrel measurement method can effectively avoid measurement errors caused by factors such as thread profile and pitch. The fluctuation amplitudes of measurement deviations in the X, Y, and Z axes are significantly smaller than those of the traditional extended measurement method, demonstrating excellent measurement stability and repeatability. This method provides a reliable and efficient solution for high-precision detection of the positional accuracy of threaded holes.

Keywords

Three-Coordinate Measurement Threaded Hole Position Degree; Threaded Mandrel Measurement Accuracy; Extension Position Degree

References

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