THE EFFECTS OF GEOMETRIC VARIABLES IN ROLL FORMING A CHANNEL SECTION

A model of the roll forming process developed previously by the author s was used to examine the effect of geometric variables such as flange length, thickness, bend angle, bend angle increment and roll diameter on the longitudinal strain developed in the roll forming of channel s ections. The peak longitudinal strain was found to increase with flang e length and then drop when the flange length reaches a critical value . The peak longitudinal strain was found to increase with thickness. I n general, increasing the bend angle increment was found to increase t he peak longitudinal strain despite the fact that the deformation leng th also increases. Increasing the roll diameter was found to decrease the peak longitudinal strain. The results from the study explain sever al roll forming phenomena observed in previous experimental studies.