Effects of mandrel on hot shear spinning of titanium alloy

In order to disclose the effects of mandrel on the hot shear spinning of titanium alloy, the differences of topography and thickness distribution of contour spinning parts from those of non-contour spinning parts were analyzed. Subsection 1.1 of the full paper improves the finite element model of Ref.14. Subsection 2.1 analyzes the differences of topography. Fig.4 through 7 give differences of various distributions, which include thickness distributions at various stages of spinning process. The above-mentioned differences and their analysis show preliminarily that: (1) the linearity and taper of each workpiece is excellent at early stage of spinning process; however, the caving in the generatrix of mandrel occurs for non-contour spinning, thus the cone angle of generatrix is less than the designed value; (2) the thickness reduction at deforming area is the combined action of pure shear deformation and tensile deformation, and the former is predominant; (3) the thickness of the workpiece spun by contour spinning distributes uniformly, but for non-contour spinning the thickness of the workpiece fluctuates along generatrix and an obvious under-thinning occurs at the final stage; (4) for non-contour spinning process, proper roller path or constraints at the location of flange is necessary to avoid the caving in and reduction of cone angle.