Metal deforming – By use of roller or roller-like tool-element
Patent
1980-09-12
1982-08-17
Larson, Lowell A.
Metal deforming
By use of roller or roller-like tool-element
72366, 72226, B21B 100
Patent
active
043443095
ABSTRACT:
The present invention is a process wherein: the process includes a method during slabbing, in which, recesses in the thicknesswise direction are formed on a pair of opposite surfaces at each end of the top and bottom of said steel ingot, subsequently, the central portions which have not been rolled, are rolled to the depth of said recesses, then, recesses in the widthwise direction are formed at the same end as described above, next, the central portions, which have not been rolled, are rolled to the depth of said recess in the widthwise direction; and, when the thicknesswise reduction value is .DELTA.H.sub.T and the widthwise reduction value is .DELTA.H.sub.W in said thicknesswise and widthwise reduction rollings, .DELTA.H.sub.W /.DELTA.Ht is regulated to 0.40.about.0.65 in a region where the material has a comparatively large thickness and the side profile of the material presents a double barrelling, and .DELTA.H.sub.W /.DELTA.H.sub.T is regulated to 0.3 or less in a region where the thickness of the material has a comparatively small thickness and the side profile of the material presents a single barrelling; whereby fishtails are prevented from growing so that crop loss consisting of fishtails and double-plate shaped overlaps can be reduced, thereby improving the rolling yield to a considerable extent.
REFERENCES:
patent: 1603518 (1926-10-01), Coates
patent: 3606785 (1971-09-01), Olsson
Kawasaki Steel Corporation
Larson Lowell A.
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