Abstract
The plastic upsetting of a hollow cylinder taking into account unequal interface frictional conditions is investigated by a thermo-elastic—plastic coupling model. The flow stress of the deforming workpiece is taken as a function of strain, strain rate and temperature. The effects of various combinations of unequal interface frictions at the top and bottom die surfaces on the temperature and effective strain distributions are investigated. The non-symmetrical flow induces uneven profiles of inner and outer surfaces of the hollow cylinder and hence the variations in distributions of each strain component within the billet are also predicted. The theoretical results obtained are consistent with the observations of upsetting experiments of the hollow cylinder.
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