中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 26 No. 9 September 2016 |
（1. Faculty of Mechanical Engineering, GIK Institute of Engineering Sciences & Technology, KP 23640, Pakistan;
2. Mechanical Engineering Department, Eastern Mediterranean University, North Cyprus 99450, Turkey;
3. Department of Industrial Engineering, King Abdulaziz University, Jedda 80200, Saudi Arabia;
4. Dipartimento di maccanica, Polytecnico diMilnao, Italy）
Abstract:The influence of the size of pre-cut hole of blank on the formability of cylindrical hole flanging in single point incremental forming (SPIF) was studied. The flange is produced in four stages starting from 45° to 90° and employing aluminum as the test material. It is shown that the hole size has significant effects on the stress/strain distribution on the cylindrical flange. The magnitude of hoop strains increases and the flange thickness increases as the hole size increases. Likewise, the von Mises stress reduces with the increasing of hole size. Further, there is a threshold value of hole size (i.e., 80 mm) below which severe stresses occur, which lead to sheet fracturing thus failing the successful forming of cylindrical flange. Moreover, the formability reduces as the hole size is increased above the threshold size. Finally, it is concluded that 80 mm is the threshold size of hole for maximizing the formability of aluminum sheet in incremental hole flanging.
Key words: hole flanging; single point incremental forming (SPIF); formability; stress; strain; threshold
