Metal working – Plural diverse manufacturing apparatus including means for... – Binding or covering and cutting
Patent
1998-04-01
1999-11-30
Briggs, William
Metal working
Plural diverse manufacturing apparatus including means for...
Binding or covering and cutting
72202, B23B 2304, B21B 126
Patent
active
059919914
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a machine for producing hot-rolled steel strip from input stock of continuously cast strip in sequential work steps, in which the solidified input stock is divided by means of a strip dividing machine into initial strip lengths and, after the descaling of its surface, is brought to a homogeneous rolling temperature in an equalizing furnace, roughed in at least two roll passes in a first roll stand that serves as a roughing train and, after being stored in coiling and uncoiling stations arranged in front of the finishing train, fed, after descaling, to the finishing train to be rolled to finished strip thickness.
2. Discussion of the Prior Art
Such a machine is described in German reference DE 195 12 953.9, which has not previously been published.
The previously known machines on the market for producing hot strip from thin slabs need or needed at least two continuous casting machines to achieve a capacity equilibrium, relative to the continuous hot rolling mill, of approximately 2 to 2.5 mio tpa and thus to maximize productivity.
These continuous casting machines operate at a casting speed of 5 to 6 m/min with good operational reliability and, given a casting level thickness of 50 to 80 mm, have a solidification thickness of 60 to 43 mm.
In contrast, classic continuous casting machines with a size of 1600.times.200 mm, for example, can cast at a maximum of 2 m/min. In practical operation, average casting speeds of 1.6 to 1.8 m/min are recorded, because at higher speeds casting reliability is endangered by the risk of breakthrough.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a high speed thin slabbing plant having the continuous casting stage and the rolling stage, and which combines minimum investment costs and minimum conversion costs with maximum productivity, while simultaneously attaining strip thicknesses to 1 mm or, in initial approximation, capacity equilibrium relative to the continuous finishing train.
This is achieved with minimum rolling expense by ensuring a process that requires no supply of sensible heat from outside and needs only minimum investment. Surprisingly, such a solution was found by combining the following features:
A continuous casting machine with a cast-rolling device for producing the strip-type input stock at a casting speed of 4 to 8 m/min and a solidification thickness of 90 to 125 mm, using an oscillating, hydraulically driven continuous casting mold, which has concavity between the casting level and the mold exit, and/or a strand guide device, which has concavity and/or centering and guide elements to center and guide the strand in the area of its narrow sides in the strand guide stand. A cooling and insulating line is located between the continuous casting machine and the equalizing furnace for the strip-type input stock. A cross-transfer furnace approximately 45 m in length and approximately 5 to 20 m in width, is located downstream from the strand dividing machine and upstream from the roughing train.
The invention, makes it possible to achieve minimum rolling expense and a minimum hot strip thickness of 1.0 to 0.8 mm with a single continuous casting machine, while attaining total capacity utilization of a rolling mill with a capacity of 2 to 2.5 mio tpa.
Further, this solution is characterized by the fact that the slabs can be introduced into the equalizing furnace (cross-transfer furnace) with an adequate heat content. The furnace is then responsible only for equalizing the temperature of the slab and, if necessary, permitting the slabs to be stored between the continuous casting stage and the rolling stage.
Because of production disruptions or for material-technical reasons, a buffering (holding time) of the slabs in the furnace can be necessary and can influence the internal structure (e.g., grain formation).
Accordingly, the furnace is operated in an energy-neutral fashion. The only energy that must be supplied to the furnace is what it loses via its ra
REFERENCES:
patent: 5329688 (1994-07-01), Arvedi et al.
patent: 5542165 (1996-08-01), Coassin et al.
patent: 5634510 (1997-06-01), Hirano et al.
Briggs William
Mannesmann Aktiengesellschaft
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