Metal deforming – By use of roller or roller-like tool-element – Plural roller-couples
Reexamination Certificate
1999-04-21
2001-04-17
Butler, Rodney A. (Department: 3725)
Metal deforming
By use of roller or roller-like tool-element
Plural roller-couples
C072S205000
Reexamination Certificate
active
06216516
ABSTRACT:
FIELD OF THE INVENTION
The invention deals with an installation for cold rolling of strip-shaped rolling material.
BACKGROUND OF THE INVENTION
The use of single stand reversing mills for cold rolling strip-shaped rolling material is well known. In such single stand reversing mills, up to approximately 450,000 tons per year of hot rolled strip can be cold rolled. If the steel plant has a higher output of hot rolled strips, then any hot rolled strips exceeding the approximately 450,000 tons per year yield could not be cold rolled and a second single stand reversing mill or train must be erected.
Another possibility is to provide a multi-stand, for instance, a four or five-stand tandem train, which works economically starting with an output of 1 million tons per year. In so-called “mini-steel plants,” which have an output of approximately 700,000 tons per year, the use of a four-stand tandem train for cold rolling strips is not worthwhile for economic reasons. The single-stand reversing mill or train for cold rolling strips however is inadequate for rolling the entire output of a “mini-steel mill” into cold rolled strips. The solution of providing two single-stand reversing trains in one single “mini-steel plant” is also cost intensive because the two trains are not operating at full load capacity and since relatively high installation invention must be undertaken for the two trains.
Another disadvantage of a single reversing stand, compared to multi-stand installations, is the inability to use a roughened in the last pass.
It is therefore an object of the invention to provide a cold rolling mill for a widely distributed assortment of strip-shaped rolling material.
Another object of the invention is to provide a reversing compact installation for cold rolling strip-shaped rolling material which has a yearly capacity of approximately 700,000 tons of cold rolled strip and which is thus optimally suited for use in “mini steel plants”—i.e. in production range between a reversing stand and a tandem train.
Yet another object of the invention is to assure that work rolls with variable diameters can be used to assure optimum pass reductions.
A further object of the invention is to permit use of roughened work rolls for the last pass.
Additionally, an object of the invention is to simplify and speed up the change of work rolls in case of friction driven work rolls, which again favors a higher throughout.
SUMMARY OF THE INVENTION
These and other objects of the invention, which shall be hereafter apparent, are achieved by a REVERSING COMPACT INSTALLATION FOR COLD ROLLING STRIP-SHAPED ROLLING MATERIAL with a reversing stand disposed between two reversible reels and a reel from which the strip to be used can be taken off.
Usually hot rolled strips were cold rolled in several passes. In a multi-stand tandem train, these passes are rolled in the course of one single passage, while in a single stand reversing train, three to seven passages must be performed.
Only two to three passages are however necessary in the two stand reversing train of the invention, so that a large throughput is achieved in the same time period compared to the single stand reversing trains. The installation proposed here is considerably more cost effective than two single-stand reversing trains. Also, the area requirement for the proposed two stand reversing train is smaller than in the case of two single stand reversing trains disposed, for instance, parallel to one another. It must be added that the two-stand reversing train can be arranged to lie in line with the strip treatment stations disposed upstream of the rolling train, whereas the two single stand reversing trains required for an output of approximately 700,000 tons must always be fed coils of hot rolled strips, through switches and displacement devices. It is also essential that, compared to the single-stand reversing train, a considerably higher strip tension level be achieved so that the reducing characteristic of a four to six-stand tandem train can be achieved.
REFERENCES:
patent: 2002266 (1935-05-01), Kral
patent: 3208260 (1965-09-01), Sieger et al.
patent: 5140837 (1992-08-01), Thomas et al.
patent: 5706690 (1998-01-01), Connolly
patent: 5746081 (1998-05-01), Klamma et al.
patent: 5806359 (1998-09-01), Hequet
patent: 56-59507 (1981-05-01), None
patent: 0178107 (1984-10-01), None
patent: 0151209 (1987-07-01), None
Bald Wilfried
Klamma Klaus
Brown & Wood LLP
Butler Rodney A.
SMS Schloemann-Siemag AG
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