Abstract
It was investigated that curved aluminum products with 'ㄷ' section or with 'h' section could be bended during extrusion by the extru-bending process. In order to make bending at the exit section of die, the flow of billet inside die cavity was controlled by the shape of billet. As results of the analysis of $DEFORM^{™}-3D$, it was known that the bending phenomenon at the die exit can be happened by the asymmetric section of billet. And it was known by the experiment with plasticine or aluminum material that an symmetric product with 'c' channel section and the product with flanged 'h' section could be bended because of asymmetric shape of billet.