Abstract
A mandrel-free hot spinning process was developed as a near-net-shape forming technique for a titanium alloy plate. To investigate the deformation characteristics in a mandrel-free hot spinning, a Ti-6Al-4V alloy conical product was formed from a plate which has small penetration holes. Dimensions and positions of holes in the formed products were measured. It was found that the wall thickness of formed products roughly followed the sine law. However, the result of deformation characteristics of penetration holes showed that the deformation did not follow the ideal shear deformation. It is found that shear and bending as well as torsional deformation occurs during a mandrel-free hot-spinning.
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