| 摘要 |
PURPOSE:To obtain the correct shape of the annular product of a toothed wheel, etc,. and to improve the efficiency by press-fitting into a die the both by a punch by fitting a core member having the total length longer than the thickness of an annular stock and having a tapered peripheral face from the end face at major diameter side into the core hold of the annular stock. CONSTITUTION:After arranging the annular stock 2 by its charging into a charging passage 12, the core member 1 is fitted into the core hole 3 of the annular stock 2 with its major diameter side downward. When the annular stock 2 is press-fitted into a forming passage 13 together with the core member 1 by descending a punch 5, a tooth profile part is formed by a tooth profile forming par 15 on the outer peripheral part of the annular stock 2. Thereafter, the next core member 1 is charged into a charging passage 12 in the state of its fitting into the next stock 2. By ascending the punch 5. With descending the punch 5, then, it pushes down the core member 1 at the upper side and the core member 1 at the lower side is pushed down by the projection part 6 of the core member 1 of the upper side as well and extruded from the annular stock 2 at the lower side. The tooth profile forming of th upper side annular stock 2 and the discharging of the lower side completed stock 2 are performed.
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