Grain size effect on the assembly quality of micro-scaled barrel formed by microforming

doi:10.1007/s40436-023-00456-y

Advances in Manufacturing ›› 2024, Vol. 12 ›› Issue (1): 19-32.doi: 10.1007/s40436-023-00456-y

• • 上一篇

Grain size effect on the assembly quality of micro-scaled barrel formed by microforming

Dien Hu¹, Jieyichen Fang¹, Feng Zeng², Ming-Wang Fu¹

1. Department of Mechanical Engineering, Research Institute of Advanced Manufacturing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, People's Republic of China;
2. Xiamen Yulong Machinery Co. Ltd., Xiamen, 361023, Fujian, People's Republic of China

收稿日期:2023-03-01 修回日期:2023-04-23 发布日期:2024-03-14
通讯作者: Ming-Wang Fu,E-mail:mmmwfu@polyu.edu.hk E-mail:mmmwfu@polyu.edu.hk
作者简介:Dien Hu received the M.S. degree in Mechanical Engineering from the Hong Kong Polytechnic University, Hong Kong SAR of China, in 2022. He is now a Ph.D. candidate at the Department of Mechanical Engineering, the Hong Kong Polytechnic University, Hong Kong SAR of China. His research interests include microforming and additive manufacturing;
Jieyichen Fang received the M.S. and Ph.D. degrees, both in Mechanical Engineering from the Hong Kong Polytechnic University, Hong Kong SAR of China, in 2018 and 2023, respectively. Her research interests include microforming and highentropy alloys;
Feng Zeng senior mechanical engineer, graduated from Xi’an Jiaotong University. Now he is the general manager of Xiamen Yulong Industry Co., Ltd. He used to be the head of product design department of automobile factory and the head of parts localization of foreign forklift factory. He is profcient in metal material properties, processing technology and application scenarios, and has rich experience in machining and auto parts stamping and forming manufacturing;
Ming-Wang Fu is the Chair Professor of Advanced Manufacturing in the Department of Mechanical Engineering, The Hong Kong Polytechnic University (PolyU), Hong Kong. He is the Fellow of Society of Manufacturing Engineers, Hong Kong Institute of Engineers, the Royal Society Wolfson Visiting Fellow, and Associate Director of Research Institute for Advanced Manufacturing in the Hong Kong PolyU. From 1987 to 1995, he worked as a faculty member in China. Upon completion of his PhD study in the Singapore National University in 1997, he joined the Singapore Institute of Manufacturing Technology as a Senior Research Engineer. In Aug 2006, he joined The Hong Kong PolyU as a faculty member. He is quite active in exploring advanced materials processing, multi-scaled manufacturing, metal forming, damage and fracture in manufacturing, structure fatigue in product service, and micro-mechanics in manufacturing. These eforts aim at seeking for an epistemological understanding of the scientifc nature behind these disciplines, advancing knowledge in these areas, and successfully addressing a plethora of challenges and bottlenecked issues the explorations face, and eventually developing the state-of-the-art manufacturing processes. His researches benefted the development of the technologies in the above-described felds and led to more than 260 journal publications, 6 monographs and one volume of the Encyclopedia of Materials: Metals and Alloys. He is also sitting in the editorial board or as Associate Editor of a number of prestigious journals, including Int. J. Plast., Int. J. Mach. Tools Manuf., Int. J. Mech. Sci., Mater. Des., Int. J. Damage Mech., Int. J. Adv. Manuf. Technol., etc. He often gives keynote or plenary talk in the international conferences.
基金资助:
The authors would like to acknowledge the funding support to this research from the National Natural Science Foundation of China (Grant No. 51835011), the project of ZE1W from The Hong Kong Polytechnic University, and the General Research Fund of Hong Kong Government (Grant No. 15223520).

Grain size effect on the assembly quality of micro-scaled barrel formed by microforming

Dien Hu¹, Jieyichen Fang¹, Feng Zeng², Ming-Wang Fu¹

1. Department of Mechanical Engineering, Research Institute of Advanced Manufacturing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, People's Republic of China;
2. Xiamen Yulong Machinery Co. Ltd., Xiamen, 361023, Fujian, People's Republic of China

Received:2023-03-01 Revised:2023-04-23 Published:2024-03-14
Contact: Ming-Wang Fu,E-mail:mmmwfu@polyu.edu.hk E-mail:mmmwfu@polyu.edu.hk
Supported by:
The authors would like to acknowledge the funding support to this research from the National Natural Science Foundation of China (Grant No. 51835011), the project of ZE1W from The Hong Kong Polytechnic University, and the General Research Fund of Hong Kong Government (Grant No. 15223520).

摘要/Abstract

摘要： In this research, a method employing micro-extrusion was designed to produce the micro-scaled barrel-shaped parts with complex geometrical features to study the feasibility of the proposed microforming method and its grain size effect on the formability of the complicated internal features in terms of deformation behavior, material evolution, accuracy of dimensions and final components quality. The results reveal that the deformation behavior is highly affected by grain size and becomes unpredictable with increased grain size. In addition, assembly parameters including feature dimension, tolerance and coaxiality also vary with grain size, and the variation of grain size needs to be accommodated by different assembly types, viz., clearance fit or transition fit. From the microstructural evolution aspect, it was identified there were two dead zones and four shear bands, and the formation of these deformation zones was barely affected by the variation in grain size. Though bulges, cracks, and fracture induced voids were observed on the surface of the final components, tailoring the microstructure of the working material with finer grains could significantly avoid these defects. This study advances the understanding of forming microparts by extrusion processes and provides guidance for microforming of similar microparts.

The full text can be downloaded at https://link.springer.com/article/10.1007/s40436-023-00456-y

关键词: Microformed part, Size effect, Extrusion, Microstructural evolution, Dimensions, Assembly accuracy

Abstract: In this research, a method employing micro-extrusion was designed to produce the micro-scaled barrel-shaped parts with complex geometrical features to study the feasibility of the proposed microforming method and its grain size effect on the formability of the complicated internal features in terms of deformation behavior, material evolution, accuracy of dimensions and final components quality. The results reveal that the deformation behavior is highly affected by grain size and becomes unpredictable with increased grain size. In addition, assembly parameters including feature dimension, tolerance and coaxiality also vary with grain size, and the variation of grain size needs to be accommodated by different assembly types, viz., clearance fit or transition fit. From the microstructural evolution aspect, it was identified there were two dead zones and four shear bands, and the formation of these deformation zones was barely affected by the variation in grain size. Though bulges, cracks, and fracture induced voids were observed on the surface of the final components, tailoring the microstructure of the working material with finer grains could significantly avoid these defects. This study advances the understanding of forming microparts by extrusion processes and provides guidance for microforming of similar microparts.

The full text can be downloaded at https://link.springer.com/article/10.1007/s40436-023-00456-y

Key words: Microformed part, Size effect, Extrusion, Microstructural evolution, Dimensions, Assembly accuracy

Dien Hu, Jieyichen Fang, Feng Zeng, Ming-Wang Fu. Grain size effect on the assembly quality of micro-scaled barrel formed by microforming[J]. Advances in Manufacturing, 2024, 12(1): 19-32.

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Grain size effect on the assembly quality of micro-scaled barrel formed by microforming

Grain size effect on the assembly quality of micro-scaled barrel formed by microforming

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