The Effect of Hold Time on the Spring Back Phenomenon In A V- Dies Bending Process

Abstract

Bending process is the one important process in the sheet metal forming in many industries, the main problem of bending process is the spring back phenomenon which is happens after removing the punch. This research involves theoretical and experimental study of the effect of holding time on spring back value of sheet material in V-bending die with 90 0 , with different rolling direction and different holding time (0,10,20,30) min. (Al -Si) alloy having the thickness of (2 mm) were employed as the work pieces material for all experiments. The results revealed that as the hold time increases, the spring back decrease and spring back ratio increases.