Ōsaka, Japan
Ōsaka, Japan

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Fang S.,Xi'an Jiaotong University | Liu Y.,Xi'an Jiaotong University | Wang H.,Xi'an Jiaotong University | Taguchi T.,Osaka Seimitsu Kikai Co. | Takeda R.,Osaka Seimitsu Kikai Co.
International Journal of Precision Engineering and Manufacturing | Year: 2014

In the precision measurement of the tooth flank of cycloidal gear, there are many reasons that affect the measurement accuracy. Among the reasons, the alignment angle error of the gear axis play an important role in the measurement results of the profile and tooth trace deviations of the tooth flank. According to the measurement theory of the cycloidal gear, the mathematics model of the tooth flank is established. Based on the measurement process of the profile and tooth trace deviations by the gear measuring machine, a compensation method for the alignment angle error of the gear axis that included in the measurement results is designed. Some simulation experiments were done to verify the proposed method. Experimental results show that after compensation, the alignment angle error of the gear axis reduces significantly, more than 80% of the alignment angle error in profile deviation and more than 74% of the alignment angle error in tooth trace deviation is compensated by the method. The proposed method is helpful to improve the measurement accuracy of the cycloidal gear. © 2014, Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg.


Liu Y.,Chang'an University | Liu Y.,Xi'an Jiaotong University | Fang S.,Xi'an Jiaotong University | Fang S.,Hefei University of Technology | And 3 more authors.
Measurement Science and Technology | Year: 2016

When measuring the tooth flank of an involute helical gear by gear measuring center (GMC), the alignment angle error of a gear axis, which was caused by the assembly error and manufacturing error of the GMC, will affect the measurement accuracy of pitch deviation of the gear tooth flank. Based on the model of the involute helical gear and the tooth flank measurement theory, a method is proposed to compensate the alignment angle error that is included in the measurement results of pitch deviation, without changing the initial measurement method of the GMC. Simulation experiments are done to verify the compensation method and the results show that after compensation, the alignment angle error of the gear axis included in measurement results of pitch deviation declines significantly, more than 90% of the alignment angle errors are compensated, and the residual alignment angle errors in pitch deviation measurement results are less than 0.1 μm. It shows that the proposed method can improve the measurement accuracy of the GMC when measuring the pitch deviation of involute helical gear. © 2016 IOP Publishing Ltd.


Fang S.,Xi'an Jiaotong University | Liu Y.,Xi'an Jiaotong University | Wang H.,Xi'an Jiaotong University | Taguchi T.,Osaka Seimitsu Kikai Co. | Takeda R.,Osaka Seimitsu Kikai Co.
Measurement Science and Technology | Year: 2013

In the precision measurement of involute helical gears, the alignment angle error of a gear axis, which was caused by the assembly error of a gear measuring machine, will affect the measurement accuracy of profile deviation. A model of the involute helical gear is established under the condition that the alignment angle error of the gear axis exists. Based on the measurement theory of profile deviation, without changing the initial measurement method and data process of the gear measuring machine, a compensation method is proposed for the alignment angle error of the gear axis that is included in profile deviation measurement results. Using this method, the alignment angle error of the gear axis can be compensated for precisely. Some experiments that compare the residual alignment angle error of a gear axis after compensation for the initial alignment angle error were performed to verify the accuracy and feasibility of this method. Experimental results show that the residual alignment angle error of a gear axis included in the profile deviation measurement results is decreased by more than 85% after compensation, and this compensation method significantly improves the measurement accuracy of the profile deviation of involute helical gear. © 2013 IOP Publishing Ltd.


Komori M.,Kyoto University | Takeoka F.,Kyoto University | Kiten T.,Kyoto University | Kondo Y.,Japan National Institute of Advanced Industrial Science and Technology | And 4 more authors.
Precision Engineering | Year: 2016

The vibration/noise of gears is influenced by micrometer-order tooth pitch deviation, and therefore advanced quality control is needed in the gear manufacturing process using measuring instruments. The accuracy of the pitch measuring instrument is verified using a master gear or artifact, but its accuracy is not sufficiently high, and its manufacture is difficult. In our previous report, a novel pitch artifact named the magnetically self-aligned multiball pitch artifact, in which elements with simple geometries are aligned spontaneously by a magnetic force, was proposed for the calibration of pitch measuring instruments. The parts comprising the artifact, which consist of balls, a cylinder, and a plane, have simple geometries and can be manufactured with accuracies on the order of several tens of nanometers. Therefore, this artifact can also have high accuracy. In addition, because it undergoes self-alignment by a magnetic force, it has the advantage of easy assembly. An appropriate calibration method for this artifact using a coordinate measuring machine is proposed, and the accuracy of the artifact is evaluated in this report. The repeatability of pitch measurements when the artifact is disassembled and reassembled is investigated, and the results show high repeatability. A measurement experiment using a pitch measuring instrument is performed. These experiments verified that the calibration and measurement of the proposed pitch artifact are possible with high repeatability. © 2015 Elsevier Inc. All rights reserved.


Komori M.,Kyoto University | Takeoka F.,Kyoto University | Kondo Y.,Japan National Institute of Advanced Industrial Science and Technology | Sato O.,Japan National Institute of Advanced Industrial Science and Technology | And 2 more authors.
Journal of Advanced Mechanical Design, Systems and Manufacturing | Year: 2016

The vibration and noise from internal gears is an important issue in mechanical devices such as automobiles. The characteristics of the vibration and noise of internal gears are markedly influenced by micrometer-order manufacturing errors of the tooth flank form. Therefore, quality control using a measuring instrument is required. The accuracy of a gear measuring instrument is usually evaluated using a master gear. However, it is difficult to manufacture master gears with high accuracy because the reference surface of a master gear for an internal gear has a geometrically complicated form. This limits the accuracy of the evaluation and calibration of measuring instruments for internal gears. In order to address this problem, the present paper proposes a novel artifact with a concave spherical surface for the evaluation of the accuracy of measuring instruments for internal gears. A concave spherical surface can be manufactured with high accuracy because of its simple features. As such, a highly accurate artifact can be developed using this surface. In the present paper, the concept for the proposed artifact is described, and a mathematical model for the measurement conditions of the artifact is constructed. The design of the artifact is described, and an evaluation method for the measuring instrument is developed. The artifact is then manufactured, and its accuracy is calibrated. A measurement experiment using the proposed artifact is carried out, and the effectiveness of the evaluation method is verified. © 2016 The Japan Society of Mechanical Engineers.


Kurokawa S.,Kyushu University | Kido H.,Kyushu University | Taguchi T.,Osaka Seimitsu Kikai Co. | Okada T.,Kyushu University | And 2 more authors.
Applied Mechanics and Materials | Year: 2011

Tooth root and bottom profiles of cylindrical gears affect bending fatigue life, but it is hard to measure them with conventional gear measuring machines (GMMs), because GMMs are normally customized to measure only gear working flanks. We try to develop a new type of GMM by installing an extra 3D scanning probe and control software to measure tooth root and bottom profiles. To be able to measure in various directions, a 3D scanning probe instead of a single directional scanning probe has been attached to a GMM developed, which has servo and linear driving motors generating less heat. Discrete point measurement and scanning measurement of tooth root and bottom profiles of cylindrical gears is described and evaluation of measured results is discussed. © 2011 Trans Tech Publications.


Komori M.,Kyoto University | Takeoka F.,Kyoto University | Kiten T.,Kyoto University | Kondo Y.,Japan National Institute of Advanced Industrial Science and Technology | And 4 more authors.
Precision Engineering | Year: 2016

Gear noise is influenced by pitch deviation of micrometer order, and, therefore, the pitch of gears is inspected in manufacturing processes using measurement instruments. Master gears or artifacts are used to evaluate the accuracy of the pitch measurement instrument, but their accuracy is not sufficiently high and they are not easy to manufacture. In a previous study, the concept of a novel high-precision pitch artifact composed of simple components was proposed for the evaluation of the accuracy of pitch measurement instruments. Simple components, such as balls, cylinders, and planes, can accomplish an accuracy on the order of several tens of nanometers. Therefore, this artifact can be realized with high accuracy. In the present study, we propose a spring-force self-aligned multiball pitch artifact, in which simple components are assembled using spring force. The design of the artifact is discussed, and the artifact is manufactured. Measurement experiments using a coordinate measurement machine and a pitch measurement instrument are carried out, and the proposed pitch artifact is demonstrated to be fundamentally valid for accuracy evaluation. © 2016 Elsevier Inc.


Komori M.,Kyoto University | Takeoka F.,Kyoto University | Kiten T.,Kyoto University | Kondo Y.,Japan National Institute of Advanced Industrial Science and Technology | And 4 more authors.
Precision Engineering | Year: 2015

The vibration/noise of gears is influenced by micrometer-order tooth pitch deviation, and therefore, advanced quality control is needed in the gear manufacturing process using measuring instrument. The accuracy of the pitch measuring instrument is verified using a master gear or artifact, but its accuracy is not sufficiently high, and its manufacturing is not easy. In our previous report, a novel high-precision pitch artifact composed of simple-shape parts ("multiball pitch artifact") was proposed for the calibration of pitch measuring instruments. Simple-shape parts such as balls, cylinders, and planes can be manufactured with several-ten-nanometer-order accuracy. Therefore, this artifact can also have high accuracy. In this study, a magnetically self-aligned multiball pitch artifact is proposed in which the simple-shape parts are assembled with high precision using magnetic force without any special assembly technique. The artifact is designed and manufactured. A measurement experiment using a pitch measuring instrument is performed, and it is verified that the proposed pitch artifact is fundamentally valid for calibration. © 2014 Elsevier Inc. All rights reserved.


Taguchi T.,Osaka Seimitsu Kikai Co. | Kondo Y.,National Metrology Institute of Japan NMIJ
Measurement Science and Technology | Year: 2016

High-precision 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 high-precision 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 high-precision 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. © 2016 IOP Publishing Ltd.

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