| 摘要 |
<p>An upsetting method capable of manufacturing, by a minimum load, an upset article having swelled parts formed in a bent shape. A bar-like material (1) is mounted on a receiving die (11) so as not to move in the axial direction, the parts (2) of the material (1) are disposed in insertion holes (21) formed in guides (20) and holding the planned swelling parts (2) of the material (1) in the inserted state so as not to buckle. Next, the planned swelling parts (2) of the material (1) exposed to spaces between the heads of the guides (20) and the receiving die (11) are swelled to radially outward by moving the guides (20) in directions opposite to the moving directions of punches (30) while the planned swelling parts (2) of the material (1) are axially pressed by the punches (30). In the upsetting method, the planned swelling parts (2) of the material (1) are bent while the planned swelling parts (2) are being swelled.</p> |
