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 900, 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.