15. Study the Effects of Input Process Parameters in V-Bending Die on Springback/Go for Different Aluminium Alloys Using Taguchi Approach

Springback effect is the most sensitive feature in sheet metal forming. There are many input process parameters of die and press, which affect the springback/go. In the present study, three different aluminium alloys (AA), namely AA6082-T6, 5083-O and 5052-H32, are used. The objective of this work is to compare the effect of process parameters of V-bending die on springback by using Taguchi method. Bending angle (BA), punch load (PL) and punch velocity (PV) were taken as input process parameters. Taguchi approach and ANOVA (analysis of variance) were applied to find the most significant parameter(s) which affects the output response, that is, springback/go in V-bending process. The experiments were performed on V-bending die using a blank size 40 × 100 × 2.0 mm³ and the springback/go value was calculated using optical microscope. Taguchi L₉ orthogonal array design of experiment was applied to all aluminium alloys AA6082-T6, AA5052-H32 and AA5083-O and the experiments were performed separately. The result shows that the bending angle is the most significant parameter affecting the springback/go value with a contribution of approximate 99% for all aluminium alloys. The optimal values obtained for springback/go for AA6082-T6 at 120° BA, 4 KN PL and 8 mm/s PV, for AA5083-O at 120° BA, 2 KN PL and 24 mm/s PV and for AA5052-H32 are 120° BA, 4 KN PL and 8 mm/s PV.