| 摘要 |
PROBLEM TO BE SOLVED: To produce a tower-shaped product having stable dimension and quality by prolonging the service life of a forging metallic mold and reducing the occurrence of defect in the production of a tower-shaped forged product composed of an outer-race blank and an inner-race blank for a taper bearing. SOLUTION: In the producing method for tower-shaped product composed of the outer-race blank part and the inner-race blank part for the taper bearing, firstly, an up-set working blank 4 of a steel blank 1 is formed into a preformed body 13 having the flat face-like lower surface 14 with a die 10 and a punch 5, a columnar-like side wall surface 15, a surround part, an annular flat surface 16 and a center part disk-like dent 21, and successively, this preformed body 13 is mainly formed into the tower-shaped product 26 composed of the outer-race blank part and the inner-race blank part in the taper bearing with hot-forging, and a punching-out part 27 at the lower surface center part of the inner-race blank part in the obtained tower-shaped product 26 is taken out with the forging. COPYRIGHT: (C)2005,JPO&NCIPI
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