single-au.php

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

Paper:

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
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:
Toshiyuki Obikawa and Tsutomu 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.
Data files:
References
  1. [1] T. Obikawa, S. Satou, and T. Hakutani, “Dieless Incremental Micro Forming of Miniature Shell Objects of Aluminum Foils,” Int. J. of Machine Tools and Manufacture, Vol.49, pp. 906-915, 2009.
  2. [2] T. Sekine and T. Obikawa, “Single Point Micro Incremental Forming of Miniature Shell Structures,” J. of Advanced Mechanical Design, System and Manufacturing, Vol.4, pp. 543-557, 2010.
  3. [3] T. Obikawa, T. Hakutani, T. Sekine, S. Numajiri, T. Matsumura, and M. Yoshino, “Single-Point Incremental Micro-Forming of Thin Shell Products Utilizing High Formability,” J. of Advanced Mechanical Design, System and Manufacturing, Vol.4, pp. 1145-1156, 2010.
  4. [4] M. Arai and T. Ogata, “Development of Small Fatigue Testing Machine for Film Materials,” Trans. of Japan Society of Mechanical Engineers (A), Vol.68, pp. 801-806, 2002. (in Japanese)
  5. [5] J. Jeswiet, F.Micari, G. Hirt, A. Bramley, J. Duflou, and J. Allwood, “Asymmetric Single Point Incremental Forming of Sheet Metal,” Annals of the CIRP, Vol.54, pp. 88-114, 2005.
  6. [6] H. Iseki, “An Approximate Deformation Analysis and FEM Analysis for the Incremental Bulging of Sheet Metal Using a Spherical Roller,” J. of Material Processing Technology, Vol.111, pp. 150-154, 2001.
  7. [7] K. Jackson and J. Allwood, “The Mechanism of Incremental Sheet Forming,” J. of Material Processing Technology, Vol.209, pp. 1158-1174, 2009.
  8. [8] W. C. Emmens and A. H. van den Boogaard, “Cyclic Stretch-Bending: Mechanics, Stability and Formability,” J. of Material Processing Technology, Vol.209, pp. 196singlesingle5-1981, 2011.

*This site is desgined based on HTML5 and CSS3 for modern browsers, e.g. Chrome, Firefox, Safari, Edge, Opera.

Last updated on Sep. 28, 2021