Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지

Deep Drawing With Internal Air-Pressing to Increase The Limit Drawing Ratio of Aluminum Sheet

  • Moon, Young-Hoon (Engineering Research Center for Net Shape and Die Manufacturing, Pusan National University) ;
  • Kang, Yong-Kee (Engineering Research Center for Net Shape and Die Manufacturing, Pusan National University) ;
  • Park, Jin-Wook (Engineering Research Center for Net Shape and Die Manufacturing, Pusan National University) ;
  • Gong, Sung-Rak (Engineering Research Center for Net Shape and Die Manufacturing, Pusan National University)
  • Published : 2001.04.01
Download PDF
⟨ Previous Next ⟩

Abstract

The effects of internal air-pressing on deep drawability are investigated in this study to increase the deep drawability of aluminum sheet. The conventional deep drawing process is limited to a certain limit drawing ratio(LDR) beyond which failure will occur. The intention of this work is to examine the possibilities of relaxing the above limitation through the deep drawing with internal air-pressing, aiming towards a process with an increased drawing ratio. The idea which may lead to this goal is the use of special punch that can exert high pressure on the internal surface of deforming sheet during the deep drawing process. Over the ranges of conditions investigated for Al-1050, the local strain concentration at punch nose radius area was decreased by internal air-pressing of punch, and the deep drawing with internal air-pressing was proved to be very effective process for obtaining higher LDR.

Keywords

References

  1. Chen X. and Sowerby R., 1996, 'Blank Development and the Prediction of Earing in Cup Drawing,' International Journal of Mechanical Science, Vol. 8, No.5, pp. 509-516 https://doi.org/10.1016/0020-7403(95)00068-2
  2. Date P.P. and Padmanabhan K.A., 1992, 'On the Prediction of the Forming Limit Diagram of Sheet Metals, ' International Journal of Mechanical Science, Vol. 34, No.5, pp. 363-374 https://doi.org/10.1016/0020-7403(92)90024-B
  3. Hrivnak A. and Sobotova L. , 1992, 'The Influence of the Deformation Aging and the Conditions of Stress on the Properties of the Deep Drawing Steel Sheet,' Journal of Materials Processing Technology, Vol. 34, pp. 425-430 https://doi.org/10.1016/0924-0136(92)90137-H
  4. Johnson W. and Mellor P.B., 1983 Engineering Plasticity, 2nd Ed., Ellis Horwood, Camelot Press, UK
  5. Kawai N. et aI., 1992, 'Friction Behavior in the Cup Ironing Process of Aluminum Sheets.,' Journal of Engineering for Industry, Vol. 114, pp. 175-180
  6. Leu D.K., 1997, 'Prediction of the Limiting Drawing Ratio and the Maximum Drawing Load in Cup-Drawing,' International Journal of Machine Tools and Manufacture, Vol. 37, No.2, pp. 201-213 https://doi.org/10.1016/0890-6955(95)00107-7
  7. Lange K., 1985, Handbook of Metal Forming, McGraw-Hill, New York, pp. 20-22
  8. Roger P., 1991, Sheet Metal Forming, Adam Hilger, New York, pp. 181-242
  9. Thiruvarudehelvan S. and Loh N.H., 1993, 'Drawing of Cylindrical and Hemispherical Cups using an Improved Tooling for Friction-Actuated Blank Holding,' Journal of Materials Processing Technology, Vol. 37, pp. 267-280 https://doi.org/10.1016/0924-0136(93)90096-O
  10. Thomas J.F. and Dadras Jr. P., 1981, Modeling of Sheet Forming Processes-An Overview, Wright State Univ., Dayton, Ohio, pp. 1-22
  11. Yossifon S. and Tisosh J., 1991, 'On the Dimensional Accuracy of Deep Drawing Products by Hydroforming Processes, ' International Journal of Mechanical Science, Vol. 33, No.4, pp. 279-295 https://doi.org/10.1016/0020-7403(91)90041-Z