Experimental and numerical investigation on micro deep drawing process of stainless steel 304 foil using flexible tools |
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| Affiliation: | 1. School of Engineering, University of Glasgow, Scotland G12 8QQ, UK;2. Mechanical and Industrial Engineering Department, College of Engineering, Al Zawiya University, Al Zawiya, Libya;1. University Bretagne-Sud, EA 4250, LIMATB, F-56100 Lorient, France;2. CEMUC, Departamento de Engenharia Mecânica, Universidade de Coimbra, Pinhal de Marrocos, 3030-201 Coimbra, Portugal;1. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, People?s Republic of China;2. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;1. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;3. Key Laboratory of Micro-systems and Micro-structures Manufacturing (HIT), Ministry of Education, Harbin Institute of Technology, Harbin 150001, China;1. Department of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran;2. Department of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Iran;3. Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran;1. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China;2. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong |
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| Abstract: | Flexible forming technology provides significant application potential in various areas of manufacturing, particularly at a miniaturized level. Simplicity, versatility of process and feasibility of prototyping makes forming techniques by using flexible tools suitable for micro sheet metal forming. This paper reports the results of FE simulation and experimental research on micro deep drawing processes of stainless steel 304 sheets utilising a flexible die. The study presents a novel technique in which an initial gap (positive or negative) is adopted between an adjustment ring and a blank holder employed in the developed forming system. The blank holder is moveable part and supported by a particular spring that provides the required holding force. The forming parameters (anisotropy of SS 304 material, initial gap, friction conditions at various contact interfaces and initial sheet thickness) related with the forming process are in details investigated. The FE models are built using the commercial code Abaqus/Standard. The numerical predictions reveal the capability of the proposed technique on producing micro metallic cups with high quality and large aspect ratio. To verify these results, number of micro deep drawing experiments is conducted using a special set up developed for this purpose. As providing a fundamental understanding is required for the commercial development of this novel forming technique, hence the optimization of the initial gap in accordance with each sheet thickness, thickness distribution and punch force/stroke relationship are detected. |
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| Keywords: | Micro deep drawing Flexible die Sheet metal FE simulation |
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