Metal deforming – By use of roller or roller-like tool-element – With modification or control of temperature of work – tool or...
Patent
1998-07-31
2000-10-24
Butler, Rodney A.
Metal deforming
By use of roller or roller-like tool-element
With modification or control of temperature of work, tool or...
295277, 72229, B21B 2706, B21B 4106
Patent
active
061349348
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a process for the production of a hot-reverse-rolled strip, in particular a steel strip, wherein a strip is produced either directly by continuous casting or by continuous casting plus a subsequent roughing operation, the strip is subsequently hot-rolled in several rolling passes and after each rolling pass is wound into a coil, and a device for carrying out the process.
2. Related Art
A process of this kind is known from JP-A-2-37903.
A process for the reverse rolling of a hot strip is also described for instance in DE-A-29 00 648. With this known process, the strip after each rolling pass is picked up by a coiling means constructed as a coiler furnace. There are provided two coiler furnaces having a hot-reversing stand arranged between them; the strip as it passes back and forth is rolled in the hot-reversing stand between the coiler furnaces several times, until the strip has reached the required final thickness.
With a hot-rolling process, temperature differences between the strip ends as well as strip edges and central parts of the strip result in the course of the rolling operation. By coiling the strip, it is feasible to avoid very great temperature differences, yet equalization of temperature it is not feasible to such an extent that the strip ends or strip edges, respectively, will again exhibit a temperature which does not deviate too much from the ideal rolling temperature, since this would require a prolonged break between two successive rolling passes, i.e. the rolling operation would have to be interrupted. Insufficient utilization of the reverse rolling device as well as decrease of production would be the consequence.
SUMMARY OF THE INVENTION
The invention aims at avoiding these disadvantages and difficulties and has as its object to provide a process of the kind initially described as well as an apparatus for carrying out the process, which process and apparatus render it possible on the one hand to utilize the reverse rolling device in the best manner possible during its entire working time, i.e. to maintain a rolling operation without interruptions and without loss in terms of the amount being produced and yet to achieve optimum temperature conditions for the strip to be rolled while saving as much energy as possible, combined with the production of a strip in a continuous casting plant. Also, differences in temperature between the strip ends and the strip edges and central parts of the strip are to be kept so low as to negatively affect neither the rolling process or the rolling apparatus nor the quality of the strip.
According to the invention, this object is achieved in a process of the kind initially described, in that two or several strips are rolled alternately and during the rolling of one of the strips in at least one rolling pass the other strip or the other strips remain in a waiting position wound into a coil.
The process of the invention moreover renders it possible to achieve a lower final thicknesses, namely without additional expense of energy. Further improvement of the geometrical product tolerances (profile, thickness, flatness) can be achieved in a simple manner and without major additional expenditures. As an additional result of equalizing the temperature, the increase in the roll separating force when introducing the strip ends into the roll stand is minimized and less load is applied on the roll bearing arrangements.
From JP-A 56-59507 it is known to cold-roll electrical sheet, whereby the magnetic characteristics are to be adjusted. In particular, an aging process is to take place several times in succession, between the individual rolling passes. To that end, a strip material is reverse-rolled, wherein two strips are reverse-rolled alternately, namely such that during the rolling of one of the strips the other strip, for the purpose of aging, remains in a coiled holding position.
According to the invention, a heat equalization is suitably carried out for the strip or the strips, na
REFERENCES:
patent: 2658741 (1953-11-01), Schmidt et al.
patent: 4465912 (1984-08-01), Brettbacher et al.
patent: 4522050 (1985-06-01), Thomas
Finstermann Gerhard
Moser Friedrich
Butler Rodney A.
Voest-Alpine Industriean-lagenbau GmbH
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