| 摘要 |
PROBLEM TO BE SOLVED: To provide a forging device and a forging method which does not necessitate deburring, by forming an undercut part by vertically pressing the axis of a member to be forged. SOLUTION: An upper mold 30 is set in outside a lower mold 10 in the radial direction. The outer diameter of a contacting surface 17 is larger than the diameter of a flange 34. When the contacting surface 17 of the lower mold 10 contacts the flange 34 of the upper mold 30, the upper mold 30 tightly caps the lower mold 10. The force to move the upper mold 30 is converted into a force to tighten the lower mold 10 from the outside to the inside of the radius direction by sliding of an inclined plane 15 and a sliding plane 35. When the lower mold 10 capped by the upper mold 30 moves toward a base part 50, a member 60 to be forged is pressurized and forged. Thereby, an undercut part can be formed by application of pressure in the axial direction. As the lower mold 10, the upper mold 30 and a mold assembly composing the lower mold 10 closely contact each other, the formation of burring by the member 60 being squeezed out in the forging process can be prevented.
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