Fixed and Floating Plug Vibration Modes in Tube Drawing
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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