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AssigneeSMS Schloemann-Siemag Aktiengesellschaft
InventorsUwe Plociennik, Meinert Meyer, Ludwig Weingarten, Martin Braun
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A method and apparatus for cooling hot-rolled rolling stock, wherein, for cooling preferably both sides of hot-rolled wide strip, a heat exchange is carried out between the rolling stock and the cooling medium by a pressurized water flow through a sequence of a pressure chamber and a convection chamber, and wherein the rolling stock is cooled by a targeted control of the intensity of the forced convection. The method utilizes a combination of a cooling unit between stands and an additional roll cooling unit in the area of the roll gap at the exit side thereof using a directed pressurized water flow along a circumferential portion of the roll body of each work roll, wherein the cooling unit between stands and the roll cooling unit each operate with contactless sealing means for the surface of the rolling stock and the surface of the roll body.
An apparatus for intensively cooling hot-rolled rolling stock comprising at least one cooling unit for cooling the rolling stock on both sides thereof between two spaced-apart roll stands of a finishing train, the at least one cooling unit comprising on each side of the strip a flow duct with a pressure chamber and a convection chamber for a heat exchange between the rolling stock and the cooling medium by a forced convection for forming a directed flow of the cooling medium and for controlling an intensity of the forced convection in dependence on a flow velocity, further comprising at least one cooling body for cooling the work rolls of a first of the roll stands in a rolling direction of the rolling stock, wherein each cooling body at one of the rolls of the first roll stand defines a gap to which the cooling medium can be supplied under forced convection in the flow area between a cooling water supply and a cooling water discharge, and wherein the at least one cooling unit and the cooling body each have contactless sealing means relative to the surfaces of the rolling stock and the roll to be cooled.
A method of cooling hot-rolled rolling stock, comprising carrying out a step of cooling the rolling stock between two spaced-apart roll stands by effecting a heat exchange between the rolling stock and a cooling medium using a pressurized water flow through a sequence of a pressure chamber and a convection chamber and cooling the rolling stock by a targeted control of an intensity of a resulting forced convection, further comprising combining the step of cooling between stands with an additional step of roll cooling in an area of a roll gap on an exit side thereof utilizing a directed pressurized water flow along a circumferential portion of a roll body of each work roll, and operating the step of cooling between stands and the roll cooling each which contactless seals relative to a rolling stock surface and a roll body.
Dependencies are inferred from the claim text.
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Lubricating, cooling or heating rolls: externally
Using liquid coolants, e.g. for sections, for tubes: for strips, sheets, or plates
Rolling of metal
Term ended 3 Nov 2019 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention relates to a method of cooling hot-rolled rolling stock, wherein, for cooling preferably both sides of hot-rolled wide strip, a heat exchange is carried out between the rolling stock and the cooling medium by means of a pressurized water flow through a sequence of a pressure chamber and a convection chamber, and wherein the rolling stock is cooled by a targeted control of the intensity of the forced convection.
The invention also relates to an apparatus for carrying out the method.
In the drawing:
FIG. 1 is a schematic side view, partially in section, of an apparatus for cooling hot-rolled rolling stock according to the present invention; and
FIG. 2 is a schematic side view, partially in section, of another embodiment of the apparatus for cooling hot-rolled rolling stock according to the present invention.
FIG. 1 of the drawing shows the apparatus according to the present invention for cooling hot-rolled rolling stock or hot-rolled wide strip 10. For preferably cooling both sides of hot-rolled wide strip between two spaced-apart stands 8, 9, a heat exchange is carried out between the hot-rolled wide strip 10 and cooling medium by means of a forced pressurized water flow 14 between a water supply 12 and a water discharge 13 through a sequence of a pressure space 21 and a convection space 22, and the rolling stock 10 is cooled by a targeted control of the intensity of the forced convection which occurs in dependence on the flow velocity. Reference numeral 15 denotes a diffusor at the end of the cooling section, wherein used cooling water is discharged from the diffusor through a water discharge 13. In accordance with the present invention, in addition to the cooling units 20 between the stands, an additional roll cooling unit 19 is provided in the area of the exit of the roll gap 11, wherein the additional roll cooling unit 19 uses a directed and forced pressure water flow 25 along a circumferential portion of the roll body 2 of each work roll 3.
The combination of the strip cooling unit 20 between the stands 8 and 9 and an intensive roll cooling 19 with two pressurized water flows 25 which supplement each other to produce a forced convection results in an optimized functional unit with a substantially increased total cooling effect.
The temperature curve shown in the drawing in broken lines corresponding to the two cooling units 19 and 20 shows that the surface temperature of the rolled strip initially sharply drops in the roll gap 11 and then once again increases as a result of the core heat of the strip (temperature equalization) until the rolled strip 10 enters the cooling unit 20 and, after entering the cooling unit 20, the temperature gradually decreases until it once again slowly increases due to temperature equalization after emerging form the cooling unit 20.