Abstract—Conical sections and shells are produce using 3-roller conical bending machines. In this conical bending process, the blank is given static bending by placing the blank over the bottom rollers and lowering the top roller. The rollers are rotated than to get roll bending action. Static bending of the plate requires larger force and it is done in multiple stages to lower down the value of required force [Gajjar et. al., 2008]. The total deflection of the top roller required is divided in steps to get the multipass bending. The machine is designed on the basis of maximum reaction forces during bending. In this paper an analytical model is proposed for the prediction of bending force during the multiple pass 3-roller conical bending. Multipass bending experiments are carried out to validate the developed model. Experimental results do not match exactly with the analytical results. So a correction factor for each pass has been found out and applied to the analytical results. The corrected analytical results match with experimental results quite satisfactorily. The model derived can be effectively used to study the effect of various parameters on the bending force and can be helpful to the researchers working in this area.

Index Terms—3-roller conical bending, Force prediction, Experimental validation, Internal bending moment, External bending moment

Cite: M K Chudasama and H K Raval, "Analytical Model for Prediction of Force during 3-Roller Multipass Conical Bending and its Experimental Verification," International Journal of Mechanical Engineering and Robotics Research, Vol.1, No.3, pp. 91-105, October 2012.