Research on the method of gear control using a coordinate measuring machine

Valeriy Sikulskiy, Kateryna Maiorova, Sergiy Zaklinskyy, Artem Suslov

Abstract


The subject of study in this article is the approbation of theoretical and technical solutions for the use of coordinate-measuring machines (CMM) in the implementation of technical inspections of the parameters of high-precision gear-type parts. The purpose of the article is to study the systematic errors in the geometric accuracy of the gear wheel surfaces and edges by the contact measurement method using the chosen CMM. Methods of research are empirical – analysis of existing and widespread methods of measurement, full-scale experiments, and inspection. The research tasks are to measure the gear wheel involute (profile) and the lateral line (direction) of contact, pitch errors (separately) on the left and right sides of the gear teeth, gear ring runout, and to determine the influence of eccentricity on pitch and runout errors. Additionally, the study aims to check the studied gear wheel for compliance with the 7th degree of accuracy according to DSTU ISO 1328-1:2006. The methods used are: empirical and theoretical methods of measurement, comparison, and analysis. The results of the study presented in the article: indicate that the length of the studied gear common normal has a critical accuracy, which is about 99% of the tolerance for this parameter. Therefore in practice, to check the quality of manufacturing of the teeth surfaces of the involute cylindrical gears, it is necessary to use the contact measurement method, which involves the direct contact of the sensitive element (probe) with the surface of the examined object, as it provides accuracy up to 1,5mm, which in turn, minimizes the risks of part rejection as spoilage. Conclusions: According to the technical inspection data, it was determined that the critical systematic error is affected by the total accumulated error of the tooth pitch, which is 55.3% of the tolerance, as well as the radial runout of the working surfaces, which is 54.8% of the tolerance. It should be noted that other parameters maintain a margin of accuracy of 20-30%. This can be attributed to the degree of compliance with the manufacturing technology of the experimental gear sample. The following research may involve post-operational inspection at each step of gear manufacturing in order to determine the critical stages of the technology where the length of the gear common normal acquires a critically acceptable accuracy. Furthermore, the subject of further research is the creation of a methodology for the combined use of optical 3D scanning and the contact measurement method in order to enhance measurement accuracy while reducing time and scope of measurements.

Keywords


gear; coordinate-measuring machine; measurement; geometric accuracy; technical inspection; tolerance

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DOI: https://doi.org/10.32620/aktt.2025.1.05