Fixed and Floating Plug Vibration Modes in Tube Drawing

  • R. Jones
  • S. J. Harvey


The parameters controlling the initiation of plug chatter are evaluated and their relevance to industrial applications discussed. Experimental results are presented for fixed plug drawing showing the development of non-linear vibration characteristics and the random nature of the vibration frequency. The stick-slip vibration mechanism for fixed plugs is also shown to occur for floating plugs, but the more serious and damaging modes of chatter are shown to be due to poor plug/die configurations and the vibration frequency is approximately linearly related to the plug movement. It is shown that the “plug bar” stiffness reduces as the tube is drawn and this can result in a change from stable to unstable conditions. Tube marking due to plug chatter is analysed and it is shown that it is geometry effects in floating plug drawing which are the most damaging.


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    R. JONES and S.J. HARVEY (1977). The Stability of Fixed and Floating Plugs in the Tube Drawing Process. Proc. 1st Joint Poly. Symp. on Manf. Eng. Leicester.Google Scholar
  2. 2.
    R. JONES and S.J. HARVEY (1979). An Analysis of Plug Chatter in Fixed and Floating Plug Tube Drawing. Proc. 20th MTDR Conf.Google Scholar
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    C.S. COOKE (1979) A Model of Chatter Due to Stick-slip in the Plug Drawing of Tubing. A.S.M.M. Forum on Tooling for Tube Making, Phoenix Az.Google Scholar
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    DEN HARTOG, J.P. (1956) Mechanical Vibrations. McGraw-Hill.MATHGoogle Scholar
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    R. JONES (1978) The Stability of Fixed and Floating Plugs in Tube Drawing Process. Ph.D. Thesis, C.N.A.A.Google Scholar

Copyright information

© The Department of Mechanical Engineering, University College of Swansea 1981

Authors and Affiliations

  • R. Jones
    • 1
  • S. J. Harvey
    • 2
  1. 1.Department of Mechanical EngineeringHeriot-Watt UniversityEdinburghUK
  2. 2.Department of Combined EngineeringLanchester PolytechnicCoventryUK

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