Deformation Modes and Wrinkling of Flange on Shear Spinning

Abstract

It is important to investigate the deformation modes of the outer flange portion of the blank during shear spinning operation, in order to know an optimum working condition or spinnability of sheet metal. According to the measurement of the radial and cirumferential strains and the periodic variation of curvatures on the flange portion, the magnitudes of these strains and curvatures change considerably at the contact point between the roller and the blank, and do not distribute uniformly on the flange. Then, though the radius of the blank is not changeable on shear spinning, collapse into waves or wrinkles occurs, when the thickness of the blank is small. The conditions of wrinkling can be simplified by using the ratio of displacement of z direction and blank thickness t0, and flange width ratio w/r. The deformation of the flange portion is influenced mostly by feed of roller, roller diameter and blank thickness among the many working conditions, but the other conditions scarcely affect the deformation of the flange portion.