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IJAT Vol.7 No.3 pp. 256-262
doi: 10.20965/ijat.2013.p0256
(2013)

Paper:

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Fabrication of Miniature Shell Structures of Stainless Steel Foil and Their Forming Limit in Single Point Incremental Microforming

Toshiyuki Obikawa* and Tsutomu Sekine**

*Institute of Industrial Science, the University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan

**Department of Precision Engineering, School of Engineering, Tokai University, 4-1-1 Kitakaname, Hiratsuka-shi, Kanagawa 259-1292, Japan

Received:
October 9, 2012
Accepted:
April 9, 2013
Published:
May 5, 2013
Creative Commons License
Keywords:
microfabrication, single point incremental forming, stainless steel foil, miniature shell structure, forming limit criterion
Abstract
Single Point Incremental Microforming (SPIMF) using neither dies nor a backing plate is applied to the fabrication of miniature shell structures of stainless steel foil in meso-scale. A piece of 8 µm-thick blank, which is held in a blank holder on a desktop forming machine, is incrementally formed with a thin, round-tip tool. Three kinds of polygonal pyramids are formed, and their forming limits are compared to those when 12 µm-thick aluminum foil is used. It is found that the forming limit of stainless steel foil in forming pyramids depends only on the tensile strain of a triangular lateral face, whereas that of aluminum foil depends on the sum of two principal tensile strains on the surface of a rounded lateral edge. It is also found that the forming limit of stainless steel foil can be drastically increased by SPIMF.
Cite this article as:
T. Obikawa and T. Sekine, “Fabrication of Miniature Shell Structures of Stainless Steel Foil and Their Forming Limit in Single Point Incremental Microforming,” Int. J. Automation Technol., Vol.7 No.3, pp. 256-262, 2013.
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References
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