| 摘要 |
<p>A method for manufacturing a wheel rim for a wheel has: a base ring fabrication step for coiling a rectangular steel plate (10) into the form of a cylinder and welding and joining the two end parts of the coil to fabricate a base ring (20); and a rim-molding step carried out by a press, which moves an inner peripheral mold (42) and an outer peripheral mold (41) divided in the peripheral direction, to the base ring (20) to simultaneously reduce the diameter of the base ring (20) with the outer peripheral mold (41) and increase the diameter of the base ring (20) with the inner peripheral mold (42) and form the base ring (20) into a rim shape. The rim-molding step comprises at least one pre-molding step, and a finishing step.</p> |
