Abstract:
A method and device for cooling a preliminary strip of metal in a hot rolling mill including work rolls by spraying a cooling agent on to the preliminary strip, screening the preliminary strip in an edge area of the strip from influence of the cooling agent, and deflecting the cooling agent in the area of the strip edges of the preliminary strip, wherein the cooling agent is deflected from the strip edges in an area of an inlet guide of a work a work roll.
Abstract:
A spray device lubricates and cools a strip and/or an air gap of a roller stand having multiple rollers. The spray device has a fixed spray table with an elongated shape and configured to be rigidly connected to a plurality of mounting plates in a row of bearing rollers of the roller stand. The fixed spray table includes a network for dispensing a fluid for lubricating and cooling via a plurality of nozzles, a connector for connecting the fluid-dispensing network to a network for supplying the fluid, and an attachment device for rigidly connecting the table to the mounting plates. In addition, a method for removing/inserting the spray device from/into the roller stand is described.
Abstract:
The application is directed to a device (1, 1′) for cooling a roll (2), in particular a working roll (2) for rolling rolling stock (3), wherein the device comprises a cooling shell (50, 60) which lies opposite at least one part region of the circumference of the roll surface for forming a cooling gap (5) between the part region of the roll surface and the cooling shell (50, 60), through which cooling gap (5) cooling fluid can flow, and a lever (40, 44) which can be pivoted about a suspension point (8, 48), can be pivoted in the direction of the roll surface and is connected rotatably to a first half (51, 61) of the cooling shell (50, 60) as viewed in the circumferential direction (U) of the roll (2), wherein the cooling gap (5) can optionally be reduced in size or enlarged by pivoting of the lever (40, 44). Furthermore, the device according to the invention comprises a variable-length linear guide (0, 99) which can be pivoted about a further suspension point (88, 48) and is connected rotatably to the second half (59, 69) of the cooling shell (50, 60) as viewed in the circumferential direction (U) of the roll (2).
Abstract:
An apparatus and a method provided for spraying a coolant to a work piece include a coolant feed line, at least one delivery nozzle for delivering the coolant, and shielding means which surround at least part of said delivery nozzle. The shielding means are arranged with the work piece to form an essentially closed space, and said shielding means includes exhausting means for exhausting gas from the essentially closed space, and means for keeping the outside of the shielding means at a temperature above the dew point.
Abstract:
An apparatus and a method provided for spraying a coolant to a work piece include a coolant feed line, at least one delivery nozzle for delivering the coolant, and shielding means which surround at least part of said delivery nozzle. The shielding means are arranged with the work piece to form an essentially closed space, and said shielding means includes exhausting means for exhausting gas from the essentially closed space, and means for keeping the outside of the shielding means at a temperature above the dew point.
Abstract:
A thin cast strip is formed having at least one microstructure selected from the group consisting of polygonal ferrite, acicular ferrite, Widmanstatten, bainite and martinsite, a surface roughness of less than 1.5 microns Ra and a scale thickness of less than about 10 microns by applying a mixture of water and oil on the work rolls of the hot rolling mill, passing the thin cast strip at a temperature of less than 1100° C. through the hot rolling mill while the mixture of oil and water is applied to the work rolls, and shrouding the thin cast strip from the casting rolls through the hot rolling mill in an atmosphere of less than 5% oxygen to form the thin cast strip.
Abstract:
The invention deals with a rolling mill (1) for metallic products comprising at least one pair of work rolls and at least one cooling device (2) projecting a plurality of cooling jets under pressure on at least one work roll, the cooling device projecting also at least one scraper jet between the cooling jets and the metallic product to be rolled, the scraper jets being oriented in the desired flow direction following a re-entrant angle towards the perpendicular to the surface of the work roll, as well as with a rolling process using said rolling mill (1).
Abstract:
For controlling the flatness of the strip during the rolling of aluminium strip or foil, the system consists of a full width bank of cryogenic roll cooling devices acting on the roll(s) and a full width bank of roll heating devices also acting the roll(s). Both or either of the cooling and heating banks are divided into individually controllable zones. A process automation system controls the action of the cooling and heating banks via feedback from a strip shape meter and/or a predictive process model, in order, by thermal growth/contraction, to create the best roll profile for rolling flat strip.
Abstract:
A method for continuous casting and rolling at increased casting speed followed by hot rolling of relatively thin metal strand, especially steel strand (1), where presetting of target temperatures (6) of the hot strip (2) reduces temperature losses in the hot strip (2) by increasing the temperatures of the work rolls (4) at a predetermined rate of increase, starting from a low initial temperature (5), and by adjusting the strip temperature (15) to a target rolling temperature (6) of the hot strip (2) and/or by automatically controlling or regulating the intensity of the roll cooling (18).
Abstract:
There is described a method for applying a coolant to a rolled product and/or to at least one cylinder of a roll stand provided with a rolling gap. During the method the following steps can occur: determining a total cooling rate applicable according to the effective power in the rolling gap, determining the cooling rate for several areas according to a flatness distribution determined b a flatness measuring system, wherein the difference in the cooling rate is determined by comparing the totality of the thus determined cooling rates with a predetermined total cooling rate and is used for determining the components of an additional cooling rate for the areas taking into account the top and lower limits of the cooling rate thereof. Said procedure is repeated in such a way that the coolant differences remain above a predefinable value.