Abstract: A whole analysis model including forging and flat platens if
built, which is used to analyse the process of upsetting a
cylinder between flat platens. The influence of surface friction
and transient of the whole upsetting process is carried out.
From the point of view of numerical calculation, the correctness
of the centre region tension stress theory about upsetting a
cylinder between flat platens is tested and verified. The
concept of plasto-nucleus is presented to explain the forming of
double dumps. The effect of temperature is inspected. The
relation curves between the radial stress of the symmetry centre
point and the relative pression ratio are given.
Key words: Upsetting ANSYS Elasto-plastic FEM Numerical simulation Heavy forgings
Manuscript received on
January 10, 1998; revised manuscript February 9, 1998
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