System for guarantee gear tooth form accuracy : Calibration of involute checker

The vibration of gears is one of the serious problems for machines. The characteristics of vibration of gears are considerably affected by the tooth flank form deviation of micrometer order; therefore, strict quality control of the tooth flank form is required. However, because the gear checker (a gear-measuring machine) is structurally complex, it is difficult to analyze how the error factors of the gear checkers affect the measurement result. In this research, a virtual gear checker (VGC) is proposed, that is, a computer program that considers the structures, motions and possible error factors of the real gear checkers, such as motion error. The VGC can be used to simulate the gear measurement, and the effects of the error factors on the measurement result can be analyzed. It is possible to evaluate the uncertainty of tooth flank measurement much more easily and quickly with a VGC than with a real gear checker. A VGC can be used to analyze not only the gear measurement but also arbitrary-shaped objects such as a ball artefact, and the theoretical measurement result is output from the VGC. In this paper, we describe the development of a VGC, and the effect of error factors and the uncertainties of gear measurement are analyzed.

Section: Calculation Of the Theoretical Measurement Results Of The Ba...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gear checker analysis and evaluation using a virtual gear checker

Takeoka

Komori

Takahashi

et al. 2009

“…For a tooth profile measurement, a double-ball artefact (DBA) is proposed [21], for which a simple shape is also used. The DBA is composed of spheres and it is measured instead of an involute tooth flank.…”

Section: Fundamental Concept Of the Wedge Artefactmentioning

confidence: 99%

“…However, the accuracy of these artefacts (master gauges) is not satisfactory because they are difficult to manufacture due to their geometrically complicated reference surface. To solve this problem for the measurement of the tooth profile, a ball artefact [21] has been proposed, which results in evaluation with small uncertainty because the ball can be manufactured with a very high form accuracy of several tens of nanometres. A gear requires very high precision of the tooth lead form as well as the tooth profile form.…”

Section: Introductionmentioning

confidence: 99%

Evaluation method of lead measurement accuracy of gears using a wedge artefact

Komori¹,

Takeoka²,

Kubo³

et al. 2009

The reduction of the vibration and noise of gears is an important issue in mechanical devices such as vehicles and wind turbines. The characteristics of the vibration and noise of gears are markedly affected by deviations of the tooth flank form of micrometer order; therefore, strict quality control of the tooth flank form is required. The accuracy of the lead measurement for a gear-measuring instrument is usually evaluated using a master gear or a lead master. However, it is difficult to manufacture masters with high accuracy because the helix is a complicated geometrical form. In this report, we propose a method of evaluating a gear-measuring instrument using a wedge artefact, which includes a highly precise plane surface. The concept of the wedge artefact is described and a mathematical model of the measuring condition of the wedge artefact is constructed. Theoretical measurement results for the wedge artefact are calculated. The wedge artefact is designed and produced on the basis of the theoretical measurement results. A measurement experiment using the wedge artefact is carried out and its effectiveness is verified.

“…Therefore, traceability systems of gears have been developed by national institutes of many countries. In Japan, the sphere artifact (doubleball artifact) [1] and the wedge artifact (WA) [2], instead of gear artifacts, were developed as new artifacts to evaluate the GMMs. If the traceability systems of the gears are established, the international price of gears with the same quality can be accurately compared, and a proper gear price can be assured.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a high-precision gear measuring machine for helix measurement using helix and wedge artifacts

Taguchi¹,

Kondo²

2016

Highprecision gears are required for advanced motion and power transmission. The reliability of the measured value becomes important as the gear accuracy increases, and the establishment of a traceability system is needed. Therefore, a highprecision gear measuring machine (GMM) with a smaller uncertainty is expected to improve the gear calibration uncertainty. For this purpose, we developed a prototype of a highprecision GMM that adopts a direct drive mechanism and other features. Then, the high measurement capability of the developed GMM was verified using gear artifacts. Recently, some new measurement methods using simple shapes such as spheres and planes have been proposed as standards. We have verified the tooth profile measurement using a sphere artifact and reported the results that the developed GMM had a high capability in tooth profile measurement. Therefore, we attempted to devise a new evaluation method for helix measurement using a wedge artifact (WA) whose plane was treated as the tooth flank, and the high measurement capability of the developed GMM was verified. The results will provide a part of information to fully assess measurement uncertainty as our future work. This paper describes the evaluation results of the developed GMM for helix measurement using both a helix artifact and the WA, and discusses the effectiveness of the WA as a new artifact to evaluate the GMMs.