【公開日：2025.06.10】【最終更新日：2025.05.16】
課題データ / Project Data
課題番号 / Project Issue Number
24UT0164
利用課題名 / Title
砥石表面元素分析
利用した実施機関 / Support Institute
東京大学 / Tokyo Univ.
機関外・機関内の利用 / External or Internal Use
内部利用（ARIM事業参画者以外）/Internal Use (by non ARIM members)
技術領域 / Technology Area
【横断技術領域 / Cross-Technology Area】（主 / Main）計測・分析/Advanced Characterization（副 / Sub）-
【重要技術領域 / Important Technology Area】（主 / Main）マテリアルの高度循環のための技術/Advanced materials recycling technologies（副 / Sub）革新的なエネルギー変換を可能とするマテリアル/Materials enabling innovative energy conversion
キーワード / Keywords
電子顕微鏡/ Electronic microscope,高度素材識別技術/ Advanced material identification technology
利用者と利用形態 / User and Support Type
利用者名（課題申請者）/ User Name (Project Applicant)
任 浩南
所属名 / Affiliation
東京大学大学院工学系研究科機械工学専攻
共同利用者氏名 / Names of Collaborators in Other Institutes Than Hub and Spoke Institutes
ARIM実施機関支援担当者 / Names of Collaborators in The Hub and Spoke Institutes
利用形態 / Support Type
（主 / Main）機器利用/Equipment Utilization（副 / Sub）-
利用した主な設備 / Equipment Used in This Project
報告書データ / Report
概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)
Grinding is widely used as a finishing process in the manufacturing of metal products. This process is known for its high grinding speed and material removal rate, which lead to high heat generation during the process and potentially result in problems such as surface property degradation and a shorter lifespan. To compensate for the high heat generation, coolant is excessively used for cooling, lubrication, and chip removal. In recent years, dry grinding has become a popular topic since it is low-cost and environmentally friendly. However, in dry grinding, clogging builds up during the process due to inefficient chip removal, causing extensive regional temperature development. In this study, the clogging build-up at a specified region on the grinding wheel surface during the grinding process is monitored with a high-speed camera synchronized with the wheel rotation. A comprehensive understanding of the in-process clogging development behavior is proposed in this research.
実験 / Experimental
In the experiment, the surface of the grinding wheel is continuously captured with a synchronized high-speed camera. The experiment setup is shown in Figure 1. The surface grinding machine used in this experiment is SFGC-630 manufactured by Nagase Integrex Co., Ltd.. The high-speed camera used in Memrecam HX3 is provided by NAC Image Technology. In the grinding process, due to the high grinding speed, sparks of material particles are generated and ejected. To avoid the potential damage that can be caused by sparks, the high-speed camera is placed in the opposite direction of spark ejection. To continuously capture the specific region of the grinding wheel, the shutter of the camera is synchronized with the encoder of the grinding tool axis. The encoder sends a voltage signal at each rotation, and the camera is set to capture a picture with a shutter time of 0.6 microseconds responding to each voltage signal. Since the shutter time is ultimately short, laser generator CAVILUX manufactured by Nobby Tech is used as a light source, its pulse width is set to be 0.2 microseconds. With the specified experiment setting, a picture of a fixed region of the grinding wheel is captured at every rotation to directly monitor any change in the tool condition. The grinding wheel used in the experiment is a vitrified white aluminum oxide type with an average abrasive size of 300 μm. The material of the workpiece is sintered steel produced for compressor in air conditioner. The grinding conditions are listed below in Table 1. Other than observation, a Kistler multicomponent dynamometer and thermocouple are used to measure the grinding force and surface temperature for further study of the wearing behaviors.
結果と考察 / Results and Discussion
As shown in Fig 2, pores among abrasives become darker after grinding. In the continuous capturing during the process, it is observed that black material slowly builds up among the tips of abrasive grits. This is the phenomenon that chips formed during grinding were not efficiently removed, causing clogging to occur. To identify the composition of the material that appears to be black in the captured picture, an elemental analysis is also conducted.The surface temperature and force during the process are also measured in the experiment. The highest temperature measured reached 880 degrees Celsius. At such high temperatures, iron chips are oxidized, which is consistent with the element analysis results. In the results of captured pictures and SEM pictures, it is observed that the chips tend to form and accumulate at the rake face side of abrasive grits. It is observed that clogging occurs in two types: 1). Workpiece material attached to the abrasive tip, which appears to be silver under the naked eye, and 2). Micrometer scale chips form and accumulate at the rake face side of the abrasive, which appear to be black powders under the naked eye. Under SEM, the wearing of grit is also observed. At location 02, it is clear that the tip of the abrasive became flat. Around location 03, a fragment of grit is observed, indicating the occurrence of grit fracture. In the experiment, surface temperature and grinding forces in different directions are also acquired. In future studies, the relation between measured data and wear behavior can be further discussed, and the clogging can be quantitatively evaluated. SEM imaging and EDX analysis were performed using a JSM-6510LA.
図・表・数式 / Figures, Tables and Equations
Fig 1. Wheel observation experiment. (a) Experiment setting, (b) Picture of wheel surface before grinding captured by high-speed camera, (c) Picture of wheel surface after grinding.
Fig.2 EDX analysis of grinding wheel surface. (a) SEM picture of analysis region, (b) EDX spectra at location 01, (c) EDX spectra at location 02, (d) EDX spectra at location 03
Grinding Conditions
その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)
1. W. Lortz, A model of the cutting mechanism in grinding, Wear, Volume 53, Issue 1, March 1979, Pages 115-1282. Brinksmeier E, Meyer D, Huesmann-Cordes AG, Herrmann C (2015) Metal- working Fluids—Mechanisms and Performance. CIRP Annals – Manufacturing Technology 64(2):605–6283. Yoshiya Fukuhara, Shuhei Suzuki, Hiroyuki Sasahara, Real-time grinding state discrimination strategy by use of monitor-embedded grinding wheels, Precision Engineering, Volume 51, January 2018, Pages 128-136 4. Moia, D.F.G., Thomazella, I.H., Aguiar, P.R. et al. Tool condition monitoring of aluminum oxide grinding wheel in dressing operation using acoustic emission and neural networks. J Braz. Soc. Mech. Sci. Eng. 37, 627–640 (2015).
成果発表・成果利用 / Publication and Patents
論文・プロシーディング（DOIのあるもの） / DOI (Publication and Proceedings)
口頭発表、ポスター発表および、その他の論文 / Oral Presentations etc.
特許 / Patents
特許出願件数 / Number of Patent Applications：0件
特許登録件数 / Number of Registered Patents：0件