Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Reexamination Certificate
2007-11-28
2011-11-01
Sullivan, Debra (Department: 3725)
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
C072S356000, C072S377000
Reexamination Certificate
active
08047042
ABSTRACT:
The present invention is a press forging method by which porosities in a raw material are removed and mechanical properties such as ductility and toughness of a steel product are at a required level in a case that a steel ingot is treated as a raw material in press forging. A cylindrical steel ingot (a so-called “round billet”) is set onto a die as a raw material, and, a forging process is applied to the steel ingot so that buckling of the steel is not generated during the forging process and that a reduction ratio and a forging ratio are more than predetermined values, respectively.
REFERENCES:
patent: 3844155 (1974-10-01), Bew et al.
patent: 4970887 (1990-11-01), Lorieux
patent: 6151948 (2000-11-01), Ashworth et al.
patent: 7454941 (2008-11-01), Bergue et al.
patent: 2004/0255637 (2004-12-01), Dohmann
patent: 62-134101 (1987-06-01), None
patent: 62-286639 (1987-12-01), None
patent: 2006-231377 (2006-09-01), None
Okumura et al., “Effect of Hot Rolling Conditions on Annihilation of Porosities in Continuous Casting Slabs”, Tetsu to Hagane, 1980, pp. 33-42, vol. 2.
Nagumo et al., “Metallurgical Significance of Hot-Rolling of Continuously-Cast Steel on Steel Plate Quality”, Seitatsu Kenkyu, 1982, pp. 140-148, vol. 309.
Japanese Industrial Standard, “Steel Forgings-General Technical Requirements”, 1988, No. JIS G 0306, 27 pages, Japanese Standards Association.
Kakizawa Noboru
Osugi Takehiro
Sato Toshihiko
Takeuchi Yugo
Yoshida Yasuo
Smith Patent Office
Sullivan Debra
Topy Kogyo Kabushiki Kaisha
LandOfFree
Press forging method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Press forging method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Press forging method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4274296