Metal deforming – By deflecting successively-presented portions of work during... – By use of deflector arranged to bend work transversely of...
Patent
1984-07-12
1986-05-27
Combs, E. Michael
Metal deforming
By deflecting successively-presented portions of work during...
By use of deflector arranged to bend work transversely of...
72368, 228 175, 228151, B21D 512
Patent
active
045907811
ABSTRACT:
An improved method of forming a skelp into a rounded tubular form in the preparation of an electric resistance welded steel pipe. Different from conventional methods, the skelp is bent in the initial and intermediate forming stages within a limited region alone along the centerline thereof to have a U-shaped flower pattern. Thereafter, the edge portions of the bent skelp are bent in the upstream fin pass rolls to have a curvature of at least 80% of the final curvature with simultaneous overbending in the boundary regions on both sides of the side portions of the rounded skelp. Finally, the rounded skelp is pressed down in the direction to decrease the vertical diameter to bulge out in the transverse direction with simultaneous unbending the overbent portions into the final curvature.
REFERENCES:
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patent: 1756403 (1930-04-01), Thomson
patent: 1811580 (1931-06-01), Goldsborough
patent: 3270697 (1966-09-01), Solum
patent: 4070887 (1978-01-01), Hankin
patent: 4339938 (1982-07-01), Nakagawa et al.
Combs E. Michael
Kawasaki Steel Corporation
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