ELASTOPLASTIC FEM ANALYSIS AND EXPERIMENTAL-STUDY OF DIAMETRAL GROWTHIN TUBE SPINNING

An elasto-plastic incremental finite-element computer program has been developed to simulate the forming process in order to be able to gain understanding of the characteristics of tube spinning theoretically. The distributions of stress, strain, residual stress and residual stra in in a workpiece and the expansion of the plastic deformation regions in the process of loading during tube spinning can be obtained throug h the calculations. The analytical results show that the forming of a bell mouthing and diametral growth in tube spinning are due mainly to the growth of circumferential stress and strain. A large number of exp erimental studies employing different process parameters in tube spinn ing has been carried out and the influences of the process parameters on diametral growth analyzed. The quantitative relationships between t he process parameters and diametral growth have been obtained in this paper. (C) 1997 Elsevier Science S.A.