Method for rolling a metal strip

Details Method for rolling a metal strip Method for rolling a metal strip

2000-12-18

2001-09-04

Tolan, Ed (Department: 3725)

Metal deforming

By use of roller or roller-like tool-element

With modification or control of temperature of work, tool or...

C072S229000, C072S365200

Reexamination Certificate

active

06282938

ABSTRACT:

The present invention relates to a method for rolling a metal strip, especially a steel strip, in a reverse rolling mill comprising a coiler upstream and a coiler downstream thereof, wherein the strip is removed from one of the coilers, passes through the reverse rolling mill with a reduction per pass of at least 10%, and is then wound onto the other coiler.
Such rolling mills and the corresponding methods for rolling are known in general. In such rolling mills, the strip is rolled by several back and forth passes (reversing).
Before rolling, the strip has a strip temperature which is often above a desired set point temperature. The object of the present invention is to provide a method by which the strip can be brought as quickly as possible to the desired rolling temperature.
The object is solved in that the strip is removed from the upstream coiler with a strip thickness and with a strip temperature above the set point temperature, passes with a travel speed through the reverse rolling mill with a first reduction per pass of maximally 5%, and is wound up on the downstream coiler, wherein the travel speed is selected such that the strip when being wound up has reached the set point temperature.
In this way, the strip is cooled significantly faster than in a temperature compensation furnace.
In practice, the reduction per pass should be selected as minimally as possible, for example, should be only 1%, because the deformation during rolling increases the strip temperature again. It is optimal when the first reduction per pass is zero, i.e., the rolling mill therefore acts only as a driver with an empty pass.
The desired rolling temperature can be adjusted even more precisely when the strip is heated on the coilers, i.e., the reverse rolling mill is designed as a so-called Steckel mill.
The method according to the invention can be used especially advantageously for performing hot rolling as well as cold rolling of steel in a single rolling mill. It is particularly advantageous when the strip temperature is above the so-called GOS line and the set point temperature is below this line when the metal to be rolled is steel.
The strip thickness, at which the strip temperature is lowered to the set point temperature, is preferably in the range of 5 and 15 mm.


REFERENCES:
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patent: 5195344 (1993-03-01), Masuda et al.
patent: 5706690 (1998-01-01), Connolly
patent: 5810951 (1998-09-01), Dorricott
patent: 5910184 (1999-06-01), Kneppe et al.
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Patent Abstracts of Japan, vol. 011, No. 380 (M-650), Dec. 11, 1987 & JP 62 151209 A (Sumitomo Metal Ind Lyd), Jul. 6, 1987.

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