Abstract: There is provided a method by which a member having an undercut in the inner peripheral portion thereof can be formed readily. To form a material (1) formed with a recess (2) and the undercut (3) by using a swaging device, while the material (1) is first gripped by a clamper (11), and a mandrel (12) is inserted into the recess (2) of the material (1). The mandrel (12) used has an outside diameter equal to the inside diameter of a blind hole of an aimed product (fuel injection nozzle). Then, the material (1) is pushed in by the mandrel (12) to a position at which the material (1) abuts on a stopper (13), and the outside surface of the material (1) is struck by swaging dies (8) to perform a swaging operation. This swaging operation reduces the inside diameter of the recess (2) to the outside diameter of the mandrel (12), with the undercut (3) left.

Abstract: A cooling structure for a working vehicle in which a shroud is attached to a radiator provided to a vehicle body, and an air-cooling fan is made face to an airflow opening of the shroud, wherein the shroud comprises a shroud body attached to the radiator, and an opening member having the airflow opening, and further comprises securing means capable of fixing the opening member to the shroud body, and of freely adjusting a fixing position of the opening member with respect to the shroud body, and a relative position between the air-cooling fan and the airflow opening of the shroud is made freely adjustable. With the configuration above, the sufficient amount of heat radiated by the radiator can be obtained without causing the disadvantages such as increased noise.