An experimental study on some formability evaluation methods in negative incremental forming

作者：Hussain G^*; Gao L; Dar N U

来源：Journal of Materials Processing Technology, 2007, 186(1-3): 45-53.

DOI：10.1016/j.jmatprotec.2006.12.005

• negative incremental forming
• formability tests
• maximum wall angle
• sine law

In single point incremental forming (SPIF), the final thickness of a deformed sheet can be predicted by the sine law. Therefore, the formability in SPIF can be expressed as the maximum wall angle (theta(max)) that a sheet would endure without fracturing. In the present study, two tests were carried out in order to evaluate the formability of an aluminum sheet. In the first test, conical frustums and square pyramids, a set of each, were produced by systematically varying the wall angle in order to investigate theta(max). In the second test, four conical frustums, each having varying wall angle, designed by revolving different curved lines were formed to fracture. The results revealed that the value of theta(max) obtained from the former test was smaller than those obtained from the latter one. Moreover, a variation among the values of theta(max) obtained from the parts of the second test was also found. Since the first test shows the minimum possible value of theta(max) it should be employed in combination with the second test so as to minimize the number of experiments required.

• 出版日期2007-5-7
• 单位南京航空航天大学