Patent ID: 7861412
Filing Date: 2011-01-04
Classification: B21D,Y10T

Abstract:
1. A method for molding a vehicular wheel rim, the method comprising: electromagnetic molding a cylindrical body having a drop portion and two side portions, the drop portion having a diameter smaller than a diameter of the side portions, by disposing an electromagnetic molding die on the side of an outer periphery of a metallic cylindrical material, the electromagnetic molding die having an inner face which serves as a molding face, disposing an electromagnetic molding coil on the side of an inner periphery of the cylindrical material and by charging electrical energy to the electromagnetic molding coil to enlarge and press the cylindrical material against the molding face of the molding die; and after said electromagnetic molding operation, externally curling edges of the side portions by pressing the edges of the side portions in an axial direction with curling dies while restraining an outer periphery of the drop portion of the cylindrical body with a buckling preventing die, wherein the electromagnetic molding die is used as the buckling preventing die in said curling operation.