Cold Extrusion of Flanges on Cylindrical Hollows

  • B. Lengyel
  • S. A. Shahmoradi
  • I. A. Chaudhry


Flanges on hollow cylindrical engineering components are often made by free upsetting when under certain conditions a bulge is formed in the unsupported portion, which on further deformation appears as a fold in the finished flange.

The alternative method of flange extrusion has been investigated for producing flange at the end, or away from the end of tubes. The results show that folds in the flange are often present, albeit in a reduced size under favourable conditions. The penetration of the fold or folds is greater into thicker flanges and are often accompanied by a defect in the bore of the tube which has a crack-like appearance. The diameter of the flange is uneven and its shape can be irregular. Particularly thinner flanges often obtain a dished shape, which becomes more pronounced as the diameter of the flange increases.

An upper bound method developed to predict extrusion pressures agreed well with experiments over particular flange tickness/tube wall thickness ratios.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Béla Lengyel and S.A. Shahmoradi (1988) Forming Flanged Components by Upsetting. Proc. 27th Matador Conf., UMIST.CrossRefGoogle Scholar
  2. 2.
    J.M. Alexander and B. Lengyel (1964) On the Cold Extrusion of Flanges Against High Hydrostatic Pressure. J. Inst. Metals, 93, p. 137Google Scholar
  3. 3.
    H. Ll. D. Pugh (1965) Recent Developments in Cold Forming. Bulleid Memorial Lectures, Vol. IIIA, p. 27.Google Scholar
  4. 4.
    B. Parsons, P.R. Milner and B.N. Cole (1973) Study of Injection Upsetting of Metals. J. Mech. Eng. Sci., 15, p. 410.CrossRefGoogle Scholar
  5. 6.
    P.F. Thomason (1968) The Use of Pure Aluminium as an Analogue for the History of Plastic Flow, in Studies of Ductile Fracture Criteria in Steel Compression Specimens. Int. J. Mech. Sci., 10, p. 501.Google Scholar
  6. 7.
    F.W. Travis (1970) The Inhomogeneous Deformation of Hollow Cylinders Subjected to Static and Dynamic Axial Compression. Int. J. Pro. Res., 8, p. 133.CrossRefGoogle Scholar
  7. 8.
    A.T. Male and M.G. Cockroft (1965) A Method for the Determination of the Coefficient of Friction of Metals under Conditions of Bulk Plastic Deformation. J. Inst. Met., 93, p. 38.Google Scholar
  8. 9.
    B. Avitzur (1968) Metal Forming Processes and Analysis. McGraw-Hill, p. 78.Google Scholar

Copyright information

© Department of Mechanical Engineering University of Manchester Institute of Science and Technology 1993

Authors and Affiliations

  • B. Lengyel
    • 1
  • S. A. Shahmoradi
    • 1
  • I. A. Chaudhry
    • 1
  1. 1.Imperial College of ScienceTechnology and MedicineLondonUK

Personalised recommendations