Analysis of stress states with hollow parts in process of backward-radial extrusion

Abstract

Abhari P. B., Malii K. V., Kuzenko O. A. Analysis of stress states with hollow parts in process of backward-radial extrusion // Material working by pressure.  – 2019. – № 2 (49). - Р. 123-127.

Backward-radial exrusion process of hollow parts with thickness is considered. The stress-strain state of billet in the process of deformation was investigated by the finite element method with QForm 2D /3D software package. As a result of the study, we obtained the distribution in the intensity of strains and the intensity of stresses in the deformation center at different stages of the backward-radial extrusion process. The deformation center, concentrated under the punch at a certain depth and in the wall of the resulting glass, and the maximum value in the intensity of deformations is observed at the transition edge of the punch in the area of the calibration belt in the punch. Processing the results of the force regime analysis plotted the dependence of the extrusion force P on the stroke of the working punch S. It was found that with the movement of the active punch is constantly increasing the deformation force from zero to 500 kN in each of the three extrusion zones due to the constant increase in the volume of the focus deformation in the deformable billet.