Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Reexamination Certificate
2007-05-08
2007-05-08
Larson, Lowell A. (Department: 3725)
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
C072S359000
Reexamination Certificate
active
10500105
ABSTRACT:
A method for manufacturing a universal joint yoke that exhibits good yield in terms of material utilization through obtainment of a universal joint yoke perform whose excess metal to be trimmed is diminished and whose cup portion is of uniform height, includes a forging step for forming a universal joint yoke preform from a workpiece6placed in a die including an upper die103and a lower die65which are to define a closed space. The forging step is performed such that, while a back pressure not lower than 0.5 kg/mm2is applied to an end of a prospective universal joint yoke cup portion41of the workpiece via a ring knock67, material of the workpiece is allowed to flow into a pin-boss-forming cavity adapted to form a pin boss portion extending opposite the prospective cup portion until a filling rate not lower than 75 % is reached, and that the ring knock is then moved in a direction opposite a regular forming direction of the upper or lower die in which the ring knock is disposed so as to initiate flow of the workpiece material toward the prospective cup portion.
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Patent Abstracts of Japan vol. 005, No. 029 (M-056) Feb. 21, 1981, abstracting JP 55-156632 of Dec. 5, 1980.
Patent Abstracts of Japan vol. 005, No. 029 (M-056) Feb. 21, 1981, abstracting JP 55-156631 of Dec. 5, 1980.
Bonk Teresa M.
Larson Lowell A.
Showa Denko K.K
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