| 摘要 |
PROBLEM TO BE SOLVED: To provide a forming method for a forging, by which yield is improved and cost reduction is realized, and to provide a preforming device used in the method. SOLUTION: The forming method for a forging comprises: a cutting process wherein a rod-like starting material A is cut into a prescribed length; a preforming process wherein a large-diameter base-material part 15 to be a base-material for large-diameter parts 1, 3, 9 is formed by pressing and deforming the cut starting material A in an axial direction; and a forging process wherein a preformed product B, which is formed in the previous process, is fitted into a mold and formed into a forging with a desired shape. The preforming device 17 is provided with: floating clamps 19, 21 which hold a part of the peripheral body part of the starting material A slidably in the axial direction of the material A; and a fixed receiving seat 23 and a movable receiving seat 25, which pinch both end surfaces of the starting material A. In the inner wall of the floating clamps 19, 21, forming guide concavities 31, 33 which promote forming of the large-diameter base-material part 15 are provided. COPYRIGHT: (C)2004,JPO&NCIPI
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