METHOD FOR MANUFACTURING WHEEL RIM FOR VEHICLE

摘要

A method for manufacturing a wheel rim for a vehicle comprises an ironing step for ironing a tubular material (4) to manufacture a tubular member (10A) having a non uniform thickness the manufacture of the tubular member (10A) being performed using an ironing device (20) provided with: a punch (26); a die (22) having a side surface which faces the punch (26) and is formed as an irregular surface; and a pressing member (23). In the ironing step a flange section (9) of the tubular material is engaged with the die (22) the pressing member (23) is moved relative to the die (22) to sandwich the flange section (9) of the tubular material under pressure between the pressing member (23) and the die (22) and then the tubular member (10A) having a non uniform thickness is manufactured by subjecting at least a portion of the tubular material (4) the portion excluding the flange section (9) of the tubular material (4) to ironing by moving the punch (26) relative to the die (22).