Abstract:
Jog forming is a technique used for manufacturing of frame rails for automobile chassis.
The rails may springback after forming which creates manufacturing difficulties. This
project studied the springback of steel after jog forming using different bend angles.
The experiments consisted of making U-shaped bend using a 5 rnrn punch and die set,
with twist angles of 14, 20, 32, and 37 degrees. The steel used was a hot-rolled grade
SAPH 440, which also features ahigh back flip with a thickness of 2.3 mm. The results
show that the required force to create the bend continued to increase for 3 percent
following the degree of distortion. The springback of the wall section increased with
increasing twist angle. The left and right wall of the part have back flip angles in the
range of2.7 - 3 percent and 5.65 - 7.85 percent, respectively.