Prof. Jianhua Wang Profile

Prof. Jianhua Wang

at Xi'an Technological Univ

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Proceedings Article | 18 December 2023 Paper

High precision optical measurement of involute tooth profile form deviation

Zhiyi Shang, Jianhua Wang

Proceedings Volume 12968, 1296804 (2023) https://doi.org/10.1117/12.2692272

KEYWORDS: Teeth, Optical testing, Confocal microscopy, Feature extraction, Measurement uncertainty

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In order to improve optical measurement precision of tooth profile form deviation, a high resolution line spectral confocal method was used. Aiming at the problem that tooth profile information contained in optical measurement results and traditional contact measurement results are inconsistent and couldn't be directly compared, A form feature data filtering method of virtual probe envelope contact points was proposed. This method simulated filtering method of contact probe to filter optical tooth profile data and extract macroscopic form feature data. In order to calculate tooth profile deviation along expanded length direction, firstly, the iterative nearest point method was used to register extracted tooth profile with theoretical involute profile in gear coordinate system to achieve coordinate conversion, and then the deviation value was calculated. In the experiment, the profile form deviation of gear involute master was measured by line spectral confocal method, and compared with verification results of contact method. The results showed that the measured tooth profile data filtered by the proposed envelope filtering method could be directly compared with the results of the contact method. The average value of optical measurement results of tooth profile deviation was 1.07 μm, which was consistent with verification results, and the maximum difference between them was 0.12 μm. Moreover, the form change of tooth profile deviation curve was highly consistent with that of verification curve, which verified the effectiveness of proposed method.

Proceedings Article | 7 March 2019 Paper

Evaluation of task specific measurement uncertainty for gear measuring instrument using VGMI

Peili Yin, Jianhua Wang

Proceedings Volume 11053, 1105323 (2019) https://doi.org/10.1117/12.2511735

KEYWORDS: Monte Carlo methods, Computer simulations

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This paper aims to evaluate the task specific measurement uncertainty for gear measuring instrument (GMI) using virtual gear measuring instrument (VGMI). With the aid of Modular Simulation and Monte Carlo method, the uncertainty evaluation model is established on VGMI. The measurement uncertainty of the tooth profile deviation is evaluated by VGMI taking the tooth profile deviation of the involute cylindrical gear as the measured parameter. The uncertainty sources are considered in the simulation including the geometric error, the head error and the workpiece installation error. To verify the measurement uncertainty model of VGMI, we designed three involute tooth surface models with different reference precision, and their profile deviation measurement uncertainties are simulated by VGMI. The results show that VGMI is feasible, effective and correct for the measurement uncertainty evaluation. VGMI provides a new tool for evaluating the task specific measurement uncertainty for the gear measurement instrument. It can realize the seamless connection with the real measurement software. The ability to change measured workpiece model without reestablishing the VGMI model is also a significant advantage.

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