Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
권호 표지

A Study on the Forming Characteristics of Forward and Backward Extrusions

전.후방 캔 압출공정의 성형특성 연구

  • 심지훈 (인하대학교 기계공학과 대학원) ;
  • 최호준 (인하대학교 자동차공학과 대학원) ;
  • 옥정한 (인하대학교 기계공학과 대학원) ;
  • 함병수 (인하대학교 기계공학과 대학원) ;
  • 황병복 (인하대학교 기계공학부)
  • Published : 2005.03.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper a forward-backward can extrusion process are analyzed by using rigid-plastic FEM simulation. FEM simulation is conducted to investigate forming characteristics such as deformation modes fur different process parameters. Design parameters such as thickness ratio, punch angle, friction factor and diameter ratio are selected to study the effect of them on the pattern of material flow. The analysis is focused mainly on the influences of the design factors on deformation pattern in terms of forming load, extruded length ratio and volume ratio. It is known for the simulation that the forming load, the length ratio and the volume ratio increase as the thickness ratio (TR), the wall thickness in forward direction to that in backward direction, decreases. The various punch angles have slight influence on the forming load. length ratio and volume ratio. However friction factor have little effect on the forming characteristics such as the forming load, volume ratio and so on. In addition the forming load increases as diameter ratio (DR), the outer diameter of a can in forward direction to that in backward direction, increases. Furthermore the extruded length ratio is lowest with a certain value of DR=0.85 among diameter ratios. Pressure distribution exerted on the die-material interface is illustrated schematically.

Keywords

References

  1. Osen, W., 'Possibilities and Limitations of Cold Extrusion Processes Combined with Radial Extrusion,' Advanced Technology of Plasticity, Vol. 1, pp. 575-582, 1987
  2. Lin, H. H. and Kudo, H., 'Theoretical consideration of metal flow control in cold simultaneous forward/backward extrusion,' Proc. 4th ICTP, Beijing, p. 693, 1993
  3. Park, J. N., Park, T. J., Kim, D. H. and Kim, B. M., 'Experimental Investigation on the Flow Control in Forward-Backward Extrusion of Piston-Pin for Automobile,' KSME, Vol. 26A, No.7, pp. 1366-1375,2002
  4. Lee, J. Y. and Altan, T., 'Factors Affecting the Double Cup Extrusion Test for Evaluation of Friction in Cold and Warm Forging,' Annals of the CIRP, Vol. 42,pp.347-351,1993 https://doi.org/10.1016/S0007-8506(07)62459-7
  5. Wagoner, R. H. and Chenot, J. L., 'Fundamentals of Metal Forming,' John Willey & Sons, Inc, pp. 334-335, 1996
  6. Jang, D. H., Ko, B. D., Lee, Y. S. and Hwang, B. B., 'Forming Characteristics of Radial-Backward Extrusion for Single Action Pressing,' KSPE, Vol. 18, No. 10, pp. 76-83, 2001
  7. Ko, B. D., Jang, D. H., Choi, H. J. and Hwang, B. B., 'Numerical and Experimental Investigation on the Tube Forming in the Radial-Forward Extrusion,' KSPE, Vol. 20, No. 12, pp. 168-175,2003
  8. Air Force Material Laboratory, 'Forming Equipment, Material, and Practices,' Metal and Ceramics Information Center, p. 164, 1989