Article
Automation & Control Systems
Mitsugu Yamaguchi, Tatsuaki Furumoto, Shuuji Inagaki, Masao Tsuji, Yoshiki Ochiai, Yohei Hashimoto, Tomohiro Koyano, Akira Hosokawa
Summary: This study investigates the effects of channel diameter on flow behavior and finishing characteristics using computational simulation, high-speed camera observation, and experimental validation. The research findings indicate that a decrease in channel diameter increases the flow velocity of the fluid with abrasive grains, but centrifugal force in the entrance region may cause over polishing and partial deterioration of channel form accuracy. These results demonstrate the importance of considering channel diameter and internal pressure in designing conformal cooling channels for efficient and uniform finishing.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Zhihao Li, Yugang Zhao, Guangxin Liu, Chen Cao, Qian Liu, Dandan Zhao, Xiajunyu Zhang, Chuang Zhao, Hanlin Yu
Summary: This study utilizes high-performance iron-based Al2O3 magnetic abrasive powder for magnetic abrasive finishing of AZ31B magnesium alloy, designed a composite magnetic pole processing device through force analysis, and conducted experiments using Response Surface Methodology to establish a surface roughness model with good predictive ability.
Article
Optics
Mahender Kumar Gupta, D. Dinakar, Inder Mohan Chhabra, Sunil Jha, Buchi Suresh Madireddy
Summary: This paper introduces a non-conventional polishing technique for fused silica glass, achieving angstrom level surface finishing using the Ball End Magneto rheological finishing method (BEMRF). This method minimizes subsurface damage and improves the surface roughness and material removal of fused silica glass, allowing for highly polished and precise optics fabrication.
Article
Engineering, Industrial
Xiaoxing Dong, Qianqian Cao, Zhiqing Gu, Tieyu Zhu, Congda Lu, Mingsheng Jin, Hao Wang
Summary: This study demonstrates the use of cassava starch as a cheap and easily obtained material for achieving fine finishes on internal surfaces without causing environmental or workpiece pollution. The rheological properties of cassava starch are investigated, and a theoretical model is developed to explain the material removal behavior. Experimental results show that the cassava starch medium can achieve low surface roughness, and the temperature plays a crucial role in processing efficiency. This study opens up new possibilities for precision processing using inexpensive cassava starch in other finishing techniques.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Jakub Mesicek, Quoc-Phu Ma, Jiri Hajnys, Jan Zelinka, Marek Pagac, Jana Petru, Ondrej Mizera
Summary: This study focuses on an economical solution to improve the surface roughness quality of 3D printed components using two abrasive surface finishing methods. The results show that after using this method, a 3D surface roughness value of 0.9 micrometers can be achieved.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Chemical
Ying Wang, Ling Xu Yang, Rui Jia Liu, Hui Jun Liu, Chao Liu Zeng, Sheng Long Zhu, Chao Fu
Summary: A rapid synthesis method for Cr2AlB2 from elemental powders is reported, with key factors affecting the formation investigated. Temperature was found to play a crucial role, and well crystalline Cr2AlB2 powders were successfully synthesized under specific conditions. The addition of NaCl-KCl molten salt led to a significant decrease in particle size of the obtained Cr2AlB2 powder.
Article
Engineering, Manufacturing
Wei Fan, Yijie Peng, Yang Qi, Hua Tan, Zhe Feng, Yongxia Wang, Fengying Zhang, Xin Lin
Summary: This study reveals the formation mechanism of partially melted particles in laser-based directed energy deposition (LDED) and their influence on microstructure. The formation of partially melted particles depends on various factors including laser power, scanning velocity, powder size, and powder feed speed. Additionally, a novel seed crystal mechanism is proposed to explain the abnormal formation of equiaxed grains.
INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE
(2023)
Article
Chemistry, Analytical
Guangxin Liu, Yugang Zhao, Zhihao Li, Hanlin Yu, Chen Cao, Jianbing Meng, Haiyun Zhang, Chuang Zhao
Summary: In this study, spherical Al2O3 magnetic abrasive particles (MAPs) were used to polish the inner surface of ultra-fine long cobalt-chromium alloy cardiovascular stent tubes. The prepared Al2O3 magnetic abrasives exhibited spherical shape, tight coupling with sharp-cutting hard abrasives, and were able to achieve the polishing of the inner surface of the stent tubes. The surface roughness (Ra) of the tubes decreased from 0.337 μm to 0.09 μm with an RT of 5.106 μm after the polishing process.
Article
Automation & Control Systems
Mahyar Khorasani, Amir Hossein Ghasemi, Ehsan Farabi, Martin Leary, Ian Gibson, Bernard Rolfe
Summary: This study investigates the post-processing of laser-based powder bed fusion (LB-PBF) parts using centrifugal barrel finishing (CBF). The results show that for the investigated component size, hexagonal hollow parts achieve the highest maximum removal rate. The study also reveals that rotational speed and volumetric percentage of abrasive directly influence the material removal rate (MRR).
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Subbarao Raikar, Meredith Heilig, Avinash Mamidanna, Owen J. Hildreth
Summary: This study introduces a novel self-terminating etching process for post-processing of Ti64 components, which can remove support structures and trapped powder while improving surface finish.
ADDITIVE MANUFACTURING
(2021)
Article
Engineering, Manufacturing
Arun Prasanth Nagalingam, Vijay Santhanam, Nithin Kumar Gupta Dachepally, S. H. Yeo
Summary: This study focuses on surface finishing additive manufactured internal passages using dynamic cavitation-assisted microparticle flow. Experimental and numerical results suggest that cavitation distribution decreases as channel size decreases and length increases, leading to a more uniform surface finish.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Engineering, Mechanical
N. Bouktib, A. Khellouki
Summary: This study investigates the influence of abrasive grain size on surface roughness and residual stress distribution during belt-finishing processes of AISI 52100 steel alloy. The results show that increasing the size of abrasive grains can stabilize residual stresses and improve their distribution, with smoother initial surfaces leading to better residual stress fields.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Chemistry, Physical
Qingshuai Feng, You Wu, Jikang Li, Yunfei Cai, Yuanyuan Zhang, Jiantao Liu, Tong Liu
Summary: By regulating the intermediate temperature and employing interrupted cooling during solution treatment, serrated grain boundaries and fine gamma' precipitates can be achieved in a nickel-based powder superalloy, leading to improved properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Chunjin Wang, Yee Man Loh, Chi Fai Cheung, Xiaoliang Liang, Zili Zhang, Lai Ting Ho
Summary: This paper presents a multi-jet polishing (MJP) method for post-processing additively manufactured (AMed) surfaces, particularly those with complex surface geometries. Through systematic polishing tests on 316L stainless steel (SS) prepared by powder bed fusion, the polishing performance and the effect of key parameters are evaluated. The results demonstrate the effectiveness of MJP in obtaining nanometric surface roughness on AMed 316L SS, indicating the potential wide application of MJP for post-processing complex AMed surfaces.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Mechanical
Harikrishnan Ramadas, Sagar Sarkar, Ashish Kumar Nath
Summary: The study compared the abrasive wear resistance property of L-PBF 15-5 Precipitation Hardening Stainless Steel to that of the conventionally manufactured wrought counterpart, showing better wear resistance for the L-PBF specimens due to the fine grain size and formed network of grain boundaries.
Article
Engineering, Multidisciplinary
Tomohiro Koyano, Yuki Sugata, Akira Hosokawa, Tatsuaki Furumoto
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2019)
Article
Engineering, Multidisciplinary
Yohei Hashimoto, Tomoya Sano, Tatsuaki Furumoto, Akira Hosokawa
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2019)
Article
Engineering, Industrial
Tatsuaki Furumoto, Kazushi Oishi, Satoshi Abe, Kotaro Tsubouchi, Mitsugu Yamaguchi, Adam T. Clare
Summary: This study investigates the dynamic temperature behavior around a melt pool in metal-based powder bed fusion using a laser beam. The temperature distribution of the melt pool is influenced by morphological changes of the metal powder, causing asymmetric temperature distribution. Factors such as droplet cohesion, remaining heat energy, and heat conduction inside the melt pool play significant roles.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Engineering, Industrial
Tatsuaki Furumoto, Ryuya Saito, Kota Watanabe, Yuzo Ochi, Yohei Hashimoto, Mitsugu Yamaguchi, Tomohiro Koyano, Akira Hosokawa
Summary: This study is the first attempt to apply thermal stress cleavage to a single-crystal round sapphire bar using a CO2 laser and a V-shaped groove to achieve complete separation of the round surface. The research found that the fabricated sharp V-shaped groove and high aspect ratio of the groove can improve the quality of the cleaved surface, while the direction of crack propagation can be controlled through the morphology of the groove.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Engineering, Multidisciplinary
Yohei Hashimoto, Ryo Ozaki, Tatsuaki Furumoto, Akira Hosokawa
Summary: A novel measurement method for torque on the upper platen in a three-way double-sided machine was proposed in this study, which successfully measured torques in double-sided lapping experiments. The friction coefficient between the workpiece and upper pad was accurately identified by the proposed method and verified by comparison with single-sided lapping experiments.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2021)
Article
Engineering, Multidisciplinary
Yohei Hashimoto, Ryo Ozaki, Tatsuaki Furumoto, Akira Hosokawa
Summary: In this study, a calculation method for workpiece profile variation during double-sided lapping was developed using FEM deformation and contact pressure distribution. The method was found to be valuable in terms of applicable process and calculation time. It was suggested that modifying the load applied to the workpiece can help improve the bow shape of the workpiece.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2022)
Article
Engineering, Multidisciplinary
Yohei Hashimoto, Yugo Nakayama, Tatsuaki Furumoto, Akira Hosokawa
Summary: The study showed that using a cover plate in gyro finishing process can significantly improve the finishing efficiency and surface quality of the workpiece. Through analyzing the force and comparing surface roughness variation, it was concluded that the use of a cover plate can double the finishing efficiency of the workpiece surface.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2022)
Article
Engineering, Industrial
Mitsugu Yamaguchi, Kotaro Kushima, Yushi Ono, Tomohiro Sugai, Tomohiro Oyama, Tatsuaki Furumoto
Summary: This study investigated the influence of oxygen concentration and humidity on the building aspects of titanium alloy powder in a laser power bed fusion system. It found that controlling humidity in the building chamber is more important than controlling oxygen concentration to prevent oxidation. Low oxygen concentration and humidity resulted in high circularity and narrow size distribution of spatter particles. High oxygen concentration and humidity caused defects in the built part due to changes in Marangoni convection. Maintaining oxygen and humidity levels below 10 ppm is crucial for building chambers.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2023)
Article
Automation & Control Systems
Akira Hosokawa, Ryosuke Shimizu, Takahiro Kiwata, Tomohiro Koyano, Tatsuaki Furumoto, Yohei Hashimoto
INTERNATIONAL JOURNAL OF AUTOMATION TECHNOLOGY
(2019)
Article
Engineering, Manufacturing
Yohei Hashimoto, Tomoya Sano, Tatsuaki Furumoto, Akira Hosokawa
JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING
(2019)
Article
Automation & Control Systems
Kyota Egashira, Tatsuaki Furumoto, Kiichi Hishida, Satoshi Abe, Tomohiro Koyano, Yohei Hashimoto, Akira Hosokawa
INTERNATIONAL JOURNAL OF AUTOMATION TECHNOLOGY
(2019)
Article
Engineering, Manufacturing
Akira Hosokawa, Haruki Yoshimatsu, Tomohiro Koyano, Tatsuaki Furumoto, Yohei Hashimoto
JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING
(2018)
Article
Engineering, Manufacturing
Tomohiro Koyano, Akira Hosokawa, Tatsuaki Furumoto
JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING
(2018)
Proceedings Paper
Engineering, Manufacturing
A. S. Jamaludin, A. Hosokawa, T. Furumoto, T. Koyano, Y. Hashimoto
4TH ASIA PACIFIC CONFERENCE ON MANUFACTURING SYSTEMS AND THE 3RD INTERNATIONAL MANUFACTURING ENGINEERING CONFERENCE
(2018)
Proceedings Paper
Engineering, Industrial
Tomohiro Koyano, Taishi Takahashi, Seiya Tsurutani, Akira Hosokawa, Tatsuaki Furumoto, Yohei Hashimoto
19TH CIRP CONFERENCE ON ELECTRO PHYSICAL AND CHEMICAL MACHINING
(2018)