B - Operations – Transporting – 21 – B
Patent
B - Operations, Transporting
21
B
80/22, 80/51
B21B 1/08 (2006.01)
Patent
CA 1151913
ABSTRACT OF THE DISCLOSURE: A method of forming a beam blank, in which a plate- shaped slab is reduction-rolled in the widthwise direction by working rolls having box grooves each formed at the center with a projection, whereby side spreadings are created at opposite end portions in the widthwise direction of the slab to provide a blank of dog-bone shape in cross section. The blank is further rolled by working rolls having beam blank grooves to provide a beam blank of a predetermined shape in cross section. The plate-shaped slab is then reduction-rolled in the widthwise direction by working rolls having box grooves each formed at the center with a projection, according to: a first step in which the plate-shaped slab is reduction-rolled in the widthwise direction box grooves each formed at the center with a projection to provide grooves for positioning in the centers at opposite end faces in the widthwise direction of the plate-shaped slab; a second step in which the plate-shaped slab is further successively reduction-rolled in the widthwise direction by respective box grooves successively larger in width than those used in the preceding step and each formed at the center with a projection fit in the groove; and a third step in which the plate-shaped slab is further reduction-rolled in the widthwise direction by working rolls with flat bottoms or working rolls having box grooves each formed with a projection low in height, whereby recesses formed by use of the projections at opposite end faces in the widthwise direction of the slab are lessened in depth and the side spreadings are further facilitated.
359991
Akune Toshiyuki
Ehiro Takashi
Kusaba Takashi
Nakanishi Teruyuki
Tanaka Teruaki
Kawasaki Steel Corporation
Robic Robic & Associes/associates
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