... steel tubes that are unfit in the bending mold, and non-ferrous tubes. Benders are widely used ... tank 7,Oil tank cushion8,Lower mold board 9,Upper mold board 10,Bending mold11,Supporting wheel ... no pressure can be generated;(4)Put the tube tightly in the mold, otherwise concave wrinkles will be ... be bent of the tube;(4)Open the upper mold board, and select suitable mold according to the bending tube ...