Analysis of Roller Tip Radius and Blank Thickness on The Aluminium Bowl Forming by Metal Spinning Method

Metal spinning is used to form a circular metal plate by rotating the blank at high speed and then applying pressure using a roller regularly. So that, its shape will follow the shape of the mold or mandrel. There are still a few bowl-making industries in Indonesia that use the metal spinning method. In general, still use the manual method. The purpose of this study is to find the right and efficient parameters to produce the thickness and height of the bowl as expected. The method used in this study uses experimental data collection. This study uses variations in the radius of the roller tip with variations of 2 mm, 4 mm, and 6 mm, and variations in the blank thickness of 1 mm, 1.2 mm, and 1.4 mm. The results obtained from this study are good interaction results, namely a roller tip radius of 2 mm and a blank thickness of 1.4 produces the most appropriate formability, where a roller tip radius of 2 mm results in high elongation of the workpiece. The metal workpiece is given to experience deformation plastic without being damaged or torn and at a thickness of 1.4 mm experienced an increase in an area up to 44.6% from the initial blank position.