Metal deforming – By use of roller or roller-like tool-element – With cutting of work or product
Patent
1995-05-19
1997-05-06
Larson, Lowell A.
Metal deforming
By use of roller or roller-like tool-element
With cutting of work or product
723652, B21B 112
Patent
active
056260440
ABSTRACT:
A method and apparatus for producing steel bars wherein at least four individual bars are rolled at the same time from a single billet, thus increasing the production capacity of a given rolling mill operating at a predetermined velocity and designed to produce only one or two bars at the same time and without requiring tension relieving stations between the slitting box and the finishing rolling stands as in the prior art. The problems of uniform quality of final bars are solved by preforming the outermost elements of a multi-stranded stock with different shape and/or cross section as compared to the inner elements of said multi-stranded stock. An apparatus for separation of the individual elements of the multi-stranded bar is provided wherein the elements are separated at several stages starting with the two outermost elements in the first stage and continuing in the same order until the center elements are separated in the last stage. N/2 (rounded down to the next whole number) separation stages are provided for a multi-stranded sock with N elements (where N ranges from 4 to 8 as a practical matter). The capital and operational costs of a rolling mill incorporating the invention are consequently lowered.
REFERENCES:
patent: 1977285 (1934-10-01), McCleery
patent: 4193283 (1980-03-01), Bowman et al.
patent: 4727739 (1988-03-01), Piccotti
patent: 5284042 (1994-02-01), Benedetti
Nippon Steel Corporation Catalog No. PMD74, dated Apr. 1987 (and Mar. 1985) entitled: Multi-Slit Rolling Technology for Steel Bar.
Larson Lowell A.
Safford, Esq. A. Thomas S.
Schoeffler Thomas C.
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