研究者詳細 - 大橋　一仁

論文 - 大橋　一仁

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Thermal influence on surface layer of carbon fiber reinforced plastic (CFRP) in grinding 査読

Hiroyuki Kodama, Shingo Okazaki, Yifan Jiang, Hiroyuki Yoden, Kazuhito Ohashi

Precision Engineering 65 53 - 63 2020年9月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2020 Elsevier Inc. In this study, we investigated thermal influence on surface layer of CFRP in grinding with heat conduction analysis using grinding temperature at wheel contact area on dry and wet condition. Moreover, the thermal affected layer was analyzed through an experiment to examine the temperature of glass transition and thermal decomposition of the matrix resin that composes the CFRP used in this study. The influence of thermal effect on grinding of CFRP was verified based on observation of ground surface finish after grinding using SEM and the measurement of surface roughness. From the measurement result of DSC (Differential Scanning Calorimetry)，TG-DTA (Thermogravimetry-Differential Thermal Analysis), It was found that the thermal affected layer of CFRP includes a layer in which the matrix resin is changed in quality by exceeding the glass transition temperature and a layer in which the matrix resin is thermally decomposed by exceeding the thermal decomposition temperature. In addition, it was found that the surface roughness was significantly reduced if the thermal affected layer with thermal decomposition was generated. In each grinding atmosphere, it tended to increase of grinding temperature at wheel contact area with increasing in the setting depth of cut. In the case of dry grinding, grinding temperature at wheel contact area increased up to t thermal decomposition temperature of the matrix resin. However, in the case of the wet grinding, grinding temperature at wheel contact area did not increase until thermally decomposition temperature. From the result of simulation about thermal affected layer, influence of grinding heat increased with increasing in the setting depth of cut. Ultimately, the thermal affected layer with thermal decomposition was generated in dry grinding. Moreover, from the results of SEM observation, it was confirmed that the surface finish properties deteriorated significantly due to thermal decomposition of the matrix resin in the case of Δ = 400 μm in the setting depth of cut at fiber angle θ = 0°. On the other hand, it was confirmed that the micro damage of carbon fiber was occurred in wet grinding at each setting depth of cut.

DOI： 10.1016/j.precisioneng.2020.04.005

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Effect of steady rest in cylindrical traverse grinding of slender workpiece 査読

Hidetaka Fujii, Takashi Onishi, Chinhu Lin, Moriaki Sakakura, Kazuhito Ohashi

JSME 2020 Conference on Leading Edge Manufacturing/Materials and Processing, LEMP 2020 2020年

掲載種別：研究論文（国際会議プロシーディングス）

In the case of traverse grinding of a slender workpiece, the ground workpiece is easily deformed by the normal grinding force due to its low stiffness. To reduce the form error caused by the elastic deformation of the workpiece, a steady rest is widely used. Generally, a steady rest is set to push the ground area of the workpiece. However, the stepped shape error is generated at the contact point where a steady rest pushed the workpiece because the pushing force of a steady rest is decreased after the material of the contact point is removed. In this study, to reduce the stepped shape error of the ground workpiece, we proposed a new method to set a steady rest. In this method, the steady rest was set to push the area where was not ground. In addition, the traverse speed of the workpiece was adjusted to keep the elastic deformation of the workpiece constant. The suitable method to control the traverse speed was estimated by using a beam model that could simulate the elastic deformation of the workpiece during the grinding process. It was confirmed that the new method could improve the form accuracy of a slender workpiece through grinding experiments.

DOI： 10.1115/LEMP2020-8507

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Improvement of the form accuracy ground by a slender wheel in internal grinding 査読

Takashi Onishi, Yusuke Nakabayashi, Moriaki Sakakura, Go Ichiba, Kazuhito Ohashi

JSME 2020 Conference on Leading Edge Manufacturing/Materials and Processing, LEMP 2020 2020年

掲載種別：研究論文（国際会議プロシーディングス）

In the case of internal grinding of a deep hole, the inner surface of the hole was ground by a slender grinding wheel that has a high aspect ratio. A slender grinding wheel is bent by the normal grinding force during the grinding process. Therefore, the form accuracy of the ground workpiece is decreased especially when the aspect ratio of a wheel is high. In our previous study, it was confirmed that the biggest factor that generated the form error of the workpiece was the elastic deformation owning to the normal grinding force. To reduce the form error of the ground workpiece, it is effective to expand the spark-out duration. However, the expansion of the spark-out duration leads to the low productivity. In this study, the form of the grinding wheel was modified by a diamond dresser to improve the form accuracy of the workpiece without expanding the spark-out duration. The modified form of a wheel was determined to compensate the form error of the workpiece generated by the elastic deformation of the grinding wheel. Thorough several grinding experiment, it was confirmed that the form accuracy of the ground workpiece was successfully improved by modifying the form of a slender grinding wheel without expanding the spark-out duration.

DOI： 10.1115/LEMP2020-8595

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Effect of the Steady Rest on the Profile of a Slender Workpiece in Travers Grinding 査読

Chinhu Lin, Takashi Onishi, Koichi Sakamoto, Hidetaka Fujii, Moriaki Sakakura, Kazuhito Ohashi

Proceedings of 22nd International Symposium on Advances in Abrasive Technology (ISAAT2019) A08 2019年12月

Finite Element Simulation of Residual Stress in Milling of AZ31B 査読

Pengchong ZHANG, Lifeng MA, Rongjun WANG, Yao HUANG, Kazuhito OHASHI

Proceedings of 22nd International Symposium on Advances in Abrasive Technology (ISAAT2019) C10 2019年12月

Influence of Grinding Temperature on Surface Quality of CFRP 査読

Shingo OKAZAKI, Yifan JIANG, Hiroyuki KODAMA, Hiroyuki YODEN, Kazuhito OHASHI

Proceedings of 22nd International Symposium on Advances in Abrasive Technology (ISAAT2019) S09 2019年12月

Investigation on Concentric Mutual Lapping Characteristic for Improvement in Sliding Surface Function of SiC Ceramics 査読

Yusuke TANIMOTO, Hayato KOYAMA, Hiroyuki KODAMA, Kazuhito OHASHI

Proceedings of 22nd International Symposium on Advances in Abrasive Technology (ISAAT2019) A22 2019年12月

Influence on Grinding Force Distribution in Feed Rate Variations of Cemented Carbide with Vertical Face Grinding 査読

Takashi TSUJINO, Takanori FUJIWARA, Hiroyuki KODAMA, Takashi ONISHI, Shinya TSUKAMOTO, Kazuhito OHASHI

Proceedings of 22nd International Symposium on Advances in Abrasive Technology (ISAAT2019) 2019年12月

Investigation of Principal Factor Decision Support System Using Data-Mining Methodology for Surface Grinding Wheel 査読

Hiroyuki KODAMA, Itaru UOTANI, Takao MENDORI, Kazuhito OHASHI

Proceedings of 22nd International Symposium on Advances in Abrasive Technology (ISAAT2019) A21 2019年12月

Investigation of principal factor decision support system using data mining methodology for surface grinding wheel 査読

Hiroyuki Kodama, Takao Mendori, Kazuhito Ohashi

International Journal of Abrasive Technology 9 ( 4 ) 303 - 318 2019年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2019 Inderscience Enterprises Ltd. The five factors (abrasive grain, grain size, grade, structure and bonding material) of the three main elements (abrasive grain, bonding material and pore) of a grinding wheel are important parameters affecting surface quality and grinding efficiency, however it is difficult to determine an optimal combination of grinding conditions for workpiece material. In previous research, we constructed a support system for effectively selecting an appropriate grinding wheel using decision tree technique. We also proposed a visualisation process to show how grinding wheel elements and factors correspond to the materials characteristics of the workpiece material. In this research, to evaluate the usefulness of prepared visualisation maps and their effectiveness in deciding grinding wheel elements, we performed comparison experiments applying the surface grinding technique to JIS SUS310S material using PA abrasive grain as recommended by the grain-type visualisation map and WA and GC abrasive grains for comparison purposes. We found that visualisation maps enable quick selection of a grinding wheel even for the grinding of difficult-to-cut materials for which grinding wheel selection is usually difficult.

DOI： 10.1504/IJAT.2019.106676

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Improvement of the Form Accuracy in Internal Plunge Grinding by the High Aspect Ratio Wheel 査読

Takashi Onishi, Yusuke Nakabayashi, Moriaki Sakakura, Kazuhito Ohashi

Proceedings of the 8th International Conference of Asian Society for Precision Engineering and Nanotechnology 1 - 3 2019年11月

Concentric mutual lapping to improve sliding surface function of SiC ceramics 査読

Hiroyuki Kodama, Hayato Koyama, Tomoaki Ishii, Yusuke Tanimoto, Kazuhito Ohashi

International Journal of Automation Technology 13 ( 6 ) 756 - 764 2019年11月

掲載種別：研究論文（学術雑誌）

© 2019, Fuji Technology Press. All rights reserved. Ring-shaped SiC ceramics used in sliding components were examined herein. Conventional lapping generates many shallow scratches in random directions in the surface of such SiC ceramics, and these starches extend from the inner circumference of the surface to its perimeter. The scratches affect the ability of the surface to prevent liquid from escaping from the perimeter side to the inner-circumference side of the SiC ring, and they can increase the friction force of the finished surface as a sliding material. We propose concentric mutual lapping to remove the scratches caused by conventional lapping. The surface topography of a SiC ring is evaluated quantitatively using a white light interferometer, and a vector and quantitative analysis of the surface profile is proposed. The results show that concentric mutual lapping can quickly remove the scratches caused by conventional lapping, and subsequently, circumferential scratches are generated along the lapping direction. We have also conducted sliding tests to analyze the effect of surface topography on the surface function as a sliding material. The results reveal that concentric mutual lapping suppresses the differences in surface function that occurred depending on the sliding direction.

DOI： 10.20965/ijat.2019.p0756

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Improvement of the form accuracy of a slender workpiece in cylindrical traverse grinding 査読

Takashi Onishi, Teppei Takashima, Moriaki Sakakura, Koichi Sakamoto, Kazuhito Ohashi

International Journal of Automation Technology 13 ( 6 ) 728 - 735 2019年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2019, Fuji Technology Press. All rights reserved. During the cylindrical traverse grinding of a slender workpiece, the ground workpiece is easily bent by the normal grinding force owing to its low stiffness. Therefore, it is difficult to finish the slender workpiece with high accuracy. To prevent the elastic deformation of a workpiece during the grinding process, a steady rest is generally used. However, considerable skill of the worker is required to use a steady rest. Therefore, we developed a new traverse grinding method without any steady rest. In this method, the elastic deformation of a workpiece was kept constant by controlling the traverse speed of the workpiece. At the middle of the ground workpiece, where the elastic deformation increased easily, the traverse speed was slowed down. However, this method had a longer grinding cycle time because the average traverse speed decreased compared to that of the conventional method. To shorten the cycle time, the peripheral speed of the grinding wheel was increased to decrease the normal grinding force. Basic grinding experiments were carried out under several grinding conditions by changing the peripheral speed of the wheel. From these grinding experiments, it was confirmed that the normal grinding force and the form error of the ground workpiece decreased as the peripheral wheel speed increased. By using results obtained from basic experiments, grinding experiments involving changes in the traverse speed were carried out at two peripheral wheel speeds. The grinding cycle time was reduced successfully by increasing the peripheral wheel speed without an increment in the form error of the ground workpiece. Furthermore, a form error was observed at the end of the workpiece where the grinding wheel traveled away from the workpiece. The form error occurred because the normal grinding force decreased rapidly when the contact length between the workpiece and the wheel was decreased at the end of the workpiece. To prevent rapid changes in the normal grinding force, the traverse speed of the workpiece was increased at the end of the workpiece. By using this method, a ground workpiece with high form accuracy was obtained.

DOI： 10.20965/ijat.2019.p0728

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Improvement of form accuracy in internal grinding using a slender grinding wheel: Prediction of the suitable moment of the wheel retraction in the plunge internal grinding 査読

Takashi Onishi, Yuki Oda, Moriaki Sakakura, Yusuke Nakabayash, Kuya Nishi, Kazuhito Ohashi

Seimitsu Kogaku Kaishi/Journal of the Japan Society for Precision Engineering 85 ( 10 ) 885 - 890 2019年10月

掲載種別：研究論文（学術雑誌）

© 2019 Japan Society for Precision Engineering. All rights reserved. An internal surface of a deep hole is finished by internal grinding. Although the grinding wheel is fed to the axial direction of the workpiecc with oscillation in the conventional internal grinding, the end of the wheel wears out. To prevent the intensive wheel wear, we proposed a new internal grinding method. In this method, the grinding wheel was fed to the radial direction and the plunge grinding was carried out by a slender grinding wheel. In this method, the grinding wheel should be retracted at the suitable moment to reduce the internal form error of the ground workpiecc. The main cause of the form error is elastic deformation of the grinding wheel, and the wheel runout is also an error factor. The form error of the workpiece was improved with considering two kinds of error factor in the plunge internal grinding with a slender grinding wheel. Furthermore, the profile of the grinding wheel was modified to shorten the grinding cycle time.

DOI： 10.2493/jjspe.85.885

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円筒研削加工における研削抵抗の振動の遷移に関する研究査読

山本優, NAMBIAR Anand, 松本耕, 塚本真也, 大橋一仁

砥粒加工学会誌 63 ( 6 ) 2019年6月

Decision support system for principal factors of grinding wheel using data mining methodology 査読

H.Kodama, T.Uotani, K.Ohashi

Int. J. Abrasive Technology 9 ( 2 ) 89 - 98 2019年1月

Special issue on precision abrasive technology of difficult-to-machine materials

Hirofumi Suzuki, Kazuhito Ohashi

International Journal of Automation Technology 12 ( 6 ) 861 2018年11月

Improvement of shape accuracy in internal grinding using a slender grinding wheel 査読

Takashi Onishi, Kuya Nishi, Sakakura Moriaki, Yusuke Nakabayashi, Kazuhito Ohashi

Proceedings of 17th International Conference on Precision Engineering (ICPE2018) 2018年11月

Study on concentric mutual lapping for improvement in sliding surface function of SiC ceramics 査読

Yusuke Tanimoto, Hayato Koyama, Hiroyuki Kodama, Kazuhito Ohashi

Proceedings of the 21st International Symposium on Advances in Abrasive Technology (ISAAT2018) 2018年10月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© ISAAT 2018 - 21st International Symposium on Advances in Abrasive Technology. All rights reserved. In this study, the ring shaped SiC ceramics applied to sliding components are selected as specimens. In the surface of SiC ceramics, many scratches penetrating the inner edge to outer one are generated in random direction by conventional lapping. The scratches affect the surface functions in prevention of fluid exuding from the outer side to the inner side of SiC ring and have low friction force on the finished surface as a sliding material. In this study, the concentric mutual lapping is proposed to remove the scratches by conventional lapping. Then, the surface topography is evaluated quantitatively by the white light interferometer and proposed the vectorial and quantitative analysis of surface profile. As a result, the concentric mutual lapping can remove scratches quickly by the conventional lapping. And then circumferential scratches along a lapping direction were generated. In addition, we analyzed effect of surface topography on the surface function as a sliding material by sliding tests. From the investigation, it turned out that the concentric mutual lapping suppressed the difference in surface functions depending on the sliding direction.

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Estimation of the shape error in the Long workpiece from the normal grinding force of cylindrical traverse grinding 査読

Koichi Sakamoto, Takashi Onishi, Moriaki Sakakura, Naoki Kawaguchi, Kazuhito Ohashi

Proceedings of the 21st International Symposium on Advances in Abrasive Technology (ISAAT2018) 2018年10月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© ISAAT 2018 - 21st International Symposium on Advances in Abrasive Technology. All rights reserved. In cylindrical traverse grinding of a slender workpiece, the elastic deformation of the workpiece is caused by the normal grinding force. Due to the low stiffness of a slender workpiece, the workpiece shape error tends to increase especially at the end edge where the wheel draws away from the workpiece. This shape error observed at the end edge of the workpiece has great influence on the shape accuracy of the ground workpiece. Therefore, it is necessary to reduce the shape error at the end edge to improve the shape accuracy. The purpose of this study is to estimate the shape error at the end edge of the workpiece to explore appropriate grinding conditions. The shape error of the ground workpiece was estimated by calculating the elastic deformation of the ground workpiece based on the measured normal grinding force. The estimated shape error agreed well with the measured one of the actually ground workpiece. Investigation compared the shape error of the ground workpiece with the estimated one from the normal grinding force measured during the process.

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