Metal deforming – By use of roller or roller-like tool-element – With tool inside hollow work
Patent
1997-03-14
1998-01-13
Larson, Lowell A.
Metal deforming
By use of roller or roller-like tool-element
With tool inside hollow work
72370, 72208, 72 97, B21B 1710, B21B 1702
Patent
active
057066892
ABSTRACT:
A single-piece self-guiding, high integrity high mill plug for producing seamless tubular steel products in rolling mills is provided. The high mill plug is produced from a single a casting having a substantially bullet shape with an opening at each end and a passage therebetween to allow gases which develop during the casting process to escape. By designing the high mill plug to be produced from a single casting with no dead-end cores, the latent surface defects associated with the prior multi-piece casting designs are substantially avoided and the casting used to produce the single-piece self-guiding high mill plug has a very high integrity. The single-piece self-guiding high mill plug substantially improves rolling mill operations for producing seamless tubular steel products by eliminating both time and labor expenses associated with disassembling and reassembling the worn work plug sections as required by the prior art multi-piece high mill plug designs.
REFERENCES:
patent: 3577754 (1971-05-01), Calmes
patent: 3946586 (1976-03-01), Calmes
patent: 4015460 (1977-04-01), Moore, Jr.
patent: 4091650 (1978-05-01), Peytavin
patent: 4149396 (1979-04-01), Meurer et al.
patent: 5201357 (1993-04-01), Kuhn et al.
Butler Rodney A.
Larson Lowell A.
Nery Victor W.
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