Formability of pure titanium sheet in square cup deep drawing

Aiming to expand the use of the product, the formability of pure titanium sheet by square cup deep drawing was investigated. Forming of titanium sheet was tried by multistage deep drawing. In the experiment, the material was pure titanium sheets of the JIS grade 2. The initial thickness of the blank was 0.5mm in thickness. In the deep drawing process, the sheets were employed and a flat sheet blank is formed into a square by a punch. Various cups were drawn by exchanging the punch and die. The die was taper without a blankholder in the subsequent stages. For the prevention, pure titanium sheets were treated by heat oxide coating. The fresh and clean titanium is not in direct contact with the die during the forming due to the existence of the oxide layer. The effect of the plastic anisotropic on the occurrence of seizure in square cup deep drawing was also examined. The square cups were successfully drawn by heat oxide coating. The coating of titanium sheet has sufficient ability in preventing the seizure in multistage deep drawing operation. It was found that the square pure titanium cups were successfully formed by using heat oxide coating treatment. (C) 2014 Published by Elsevier Ltd.