Mechanism of mandrel on thickness and profile of parts by shear spinning

In order to disclose the mechanism of the mandrel on the thickness and profile of shear spun parts, the spinning processes with a mandrel or not were analyzed, and the distribution and variation of strain and stress were also investigated by experiment and finite element method. The results show that the thickness without mandrel is larger than that with mandrel on the whole. From bottom to top of spun part, the thickness with mandrel decreases gradually, while that without mandrel decreases at first and then increases. The linearity of part spun with mandrel is better than that without mandrel, but the tendency of the flange keeping backward and wrinkling of the former is larger than that of the latter. There is little difference in shear strain between parts with mandrel and mandrelless. In the midst and final stage, radial tensile strain and axial compression strain of part spun with mandrel increase sharply, while radial tensile strain without mandrel increases a little. So the wall of part spun with mandrel is thinner than that without mandrel. It's feasible to spin without mandrel for the part with a thicker wall at opening end and no high demand for the linearity, or the linearity of the part can be improved by subsequent spinning.