Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 03, 2017 - September 06, 2017
The formability of the laminated titanium sheet was investigated to control the ears in the deep drawn cup. Planar anisotropy causes ears to form in drawn cups. To control the occurrence of the ears, the deep drawing of the laminated sheet in consideration of anisotropy was carried out. In the experiment, the blank was pure titanium JIS1. The initial thickness and diameter of the sheet was 0.5 mm and 70 mm, respectively. The laminated sheet was constituted in two titanium sheets. Two sheets were located in the direction where varied in a rolling direction. Each sheet in stacked condition was not joined each other. Also please note that lubricant was not applied on the contact planes of sheets. In the deep drawing process, the laminated sheet was employed and a flat sheet blank was formed into a circle by a punch. A punch diameter is 40mm, and the drawing ratio is about 1.7. For the prevention of seizure in contact area between a drawing tool and titanium, titanium blank was treated by oxide coating. The clearance between the punch and die was set to be equal to the thickness of the laminated sheet. The lubricant used was the solid powders of molybdenum disulfide. The number of ears produced was four. The height of the ears decreased with increasing surface roughness. When it was located in the 45 degrees direction for a rolling direction, the ears of the drawn cup was controlled most.
