| 摘要 |
<p>To produce a rotor material efficiently. A die comprising a lower die (10) and an upper die (30) that imparts a forming load, for forging a cylindrical rotor material having a center hole (3) and a vane groove (4). The lower die (10) has a vane (13) for forming a vane groove projecting into the forming hole thereof, and a center pin (16) for forming a center hole arranged in the center of the forming hole. The upper die (30) has an upper die body (31) for imparting a main load to those parts of the lower die (10) other than the center pin (16) and the vane (13), a back pressure pin (40) fitted retractably in a center-pin-corresponding hole (35) bored in the upper die body (31) to impart a first sub-load to the center pin (16), and a back pressure plate (41) fitted retractably in a vane-corresponding hole (36) bored in the upper die body (31) to impart a second sub-load to the vane (13). At the time of die matching, the distal end face of the vane (13) is matched to the aperture face of the vane-corresponding hole (36) or separated therefrom.</p> |
