Metal working – Method of mechanical manufacture – Combined manufacture including applying or shaping of fluent...
Patent
1993-01-28
1995-08-01
Arbes, Carl J.
Metal working
Method of mechanical manufacture
Combined manufacture including applying or shaping of fluent...
29 33C, 72229, 72240, B21B 146, B21B 1322
Patent
active
054370892
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to the motel rolling sad, in particular, it deals with a method end apparatus for continuous production of hot-rolled strips.
DESCRIPTION OF THE ART
It is known to produce hot-rolled strips by a method involving continuously costing a thin slob on a continuous casting machine, cutting the slab into measured lengths, heating the cut lengths of the slab in a through soaking-pit furnace, rolling the slab lengths into strips on a multiple-stand rolling mill, cooling the strips in a cooler, and winding on an end coiler. This method cells for a very long through soaking-pit furnace which is to accommodate in line at least three cut lengths of the slab. Moreover, the apparatus should be provided with a large number of rolling stands (at least four steads). This results in an increase in the investments for carrying out the method, and the weight of a hot-rolled strip coil used as feedstock for cold rolling is limited.
It is known to produce hot-rolled strips by a method involving continuously costing a thin slab on a continuous casting machine, hosting the lending portion of the continuous slab, which is of predetermined length end weight, in a through soaking-pit furnace, winding individual portions of the slab one by one into coils on a pair of coilers stationary installed in furnaces mounted one above the other in a vertical plane, carrying out the reversible rolling of each individual portion of the slab on a rolling mill, winding a strip being rolled during forward runs in the rolling mill on a third coiler provided downstream the rolling mill, cooling the strip in a cooler, and winding on an end coiler (U.S. Pat. No. 4,630,382). This method involves an intermittent rolling of cut lengths of a slab on a rolling mill. This results in the weight of a hot-rolled coil being limited to the maximum admissible weight of coils formed by coilers installed in the furnaces. Moreover, this method is characterized by a poorer quality of portions of a strip adjacent to the ends of the strip because of increased longitudinal thickness variations caused by rolling of these portions without tension.
A prior art method for continuous production of hot-rolled strips (U.S. Pat. No. 4,793,169) involves continuously casting a thin slab on a continuous casting machine, storing the slab in a storage means, feeding the slab from the storage zone at regular intervals in the form of consecutive slab lengths, heating in a through soaking pit means, rolling the individual lengths into a strip on a rolling mill in several runs with subsequent return of the rolled length into the storage zone, cooling the rolled strip in a coiler, cutting it into individual strips of a preset weight by sheers, and winding the individual strips one by one on end coilers. The slab lengths and the returned strip lengths are stored by looping.
An apparatus for carrying out this method comprises a line including a continuous casting machine for casting a continuous thin slab, a slab storage means, a through soaking-pit means, a rolling mill, a strip cooler, shears, and end coilers for winding the finished strip. The storage comprising a vertical looping means.
However, as the steps of storing slab lengths and rolled strip lengths and their heating are carried out at time intervals, the slab of strip is intensively cooled during storage in a looping means, and their subsequent heating to a preset temperature before rolling results in an increase in power requirements. At the same time, it is very difficult to carry out looping and heating combined in a through soaking pit means. In addition, as a very short time is given for preheating a length of the strip being rolled between two consecutive runs, the intensity of heating, hence power output of a soaking pit means should be increased which also results in an increase in power requirements.
Another disadvantage of the above-described method and apparatus resides in the small length of the slab or rolled strip stored during looping. This limits the rolled strip l
REFERENCES:
patent: 4630352 (1986-12-01), Ginzburg
patent: 4698897 (1987-10-01), Formmann et al.
patent: 4793169 (1988-12-01), Ginzburg
patent: 4976024 (1990-12-01), Kimura
patent: 5150597 (1992-09-01), Sekiya et al.
patent: 5212856 (1993-05-01), Guisto et al.
Gun Igor G.
Idelchik Leonid B.
Povarich Alexandr V.
Salganik Viktor M.
Starkov Aanatoly I.
Arbes Carl J.
Magnitogorsky Metallurgichesky Kombinat Imeni V.I. Lenina
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