Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
  • B21B45/0203—Cooling
  • B21B45/0209—Cooling devices, e.g. using gaseous coolants
  • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
  • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/12—Accessories for subsequent treating or working cast stock in situ
  • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
  • B21B45/0203—Cooling
  • B21B45/0209—Cooling devices, e.g. using gaseous coolants
  • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
  • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates

Definitions

• the invention relates to a device for cooling plate-like or web-shaped material by generating a flat jet, which is directed onto the material to be cooled.
• Such devices are used primarily for the controlled cooling of sheets and strips in the steel processing industry.
• Another area of application is plastics processing.
• the object of the invention is to create a device of this type which has a large processing width and is nevertheless able to carry out the cooling process very uniformly and in this way to ensure high processing quality.
• the device according to the invention is provided with
• a first housing made of cast steel, which extends over the width of the flat jet
• a second housing made of cast steel, which is connected to the first housing at a distance from the bar and has at least one connection for introducing a cooling medium
• a distributor plate provided with through-openings, which is arranged between the two housings and separates their interiors from one another.
• the invention is based on the knowledge that welded structures are at least no longer able to achieve very uniform cooling when working with extremely wide flat jets of the order of five meters. Even after careful Stress-free annealing causes the thermal loads to warp the welded structure. After all, the nozzle is a short distance above or below the material to be cooled and is accordingly exposed to considerable heat radiation. Warping of the welded construction has a particularly negative effect on the configuration of the nozzle. The nozzle can deform in an arc shape, both in the transport direction and perpendicularly to it. It can also twist.
• the deformation can lead to the thickness of the flat jet varying over the flat jet width. All of these deformations have the disadvantage that the material is cooled unevenly across its width. Corresponding losses in quality are the result.
• the invention works with the two interconnected housings, which are made of cast steel and clamp the distribution plate between them. This creates a rigid, torsion-free construction that can withstand high thermal loads even with extreme flat jet widths, without the nozzle being deformed. The cooling process therefore runs very evenly, so that high-quality sheets can be produced.
• the second housing which preferably also extends over the width of the flat jet, receives the cooling medium and emits it evenly to the interior of the first housing via the distributor plate.
• the application of the nozzle across the width of the flat jet is correspondingly uniform.
• the second housing has a plurality of connections for introducing the cooling medium and in that the area thereof corresponds at least to the area of the through-openings of the distributor plate.
• the stability of the construction can be further increased by the fact that the interior of the first and / or the second housing with cast in the flow direction Is provided. Overall, the result is a relatively flat, upright assembly which, due to the cast construction of the two housings and the clamping of the distributor plate, is torsionally rigid and thermally highly resilient even with extreme lengths.
• the cast webs of the first housing end at a distance in front of the nozzle which is preferably at least one and a half times the length of the nozzle. In this way it is ensured that the flow disturbances caused by the cast webs have subsided before the cooling medium enters the nozzle.
• the length of the nozzle is preferably 10 mm to 40 mm in order to counter a beam expansion after exiting the nozzle.
• the bar be arranged on the outer surface of the first wall of the first housing. The bar can therefore not weaken the housing construction.
• the bar rests on the outer surface of the first wall of the first housing in a metal-sealing manner.
• the strip is preferably supported on a shoulder protruding from the first wall of the first housing. This also increases the rigidity of the entire construction.
• the thickness of the flat jet which is preferably 1 mm to _ mm, can be adjusted via a washer arranged between the bar and the shoulder. It has been shown that shims are best suited to reliably enable an exact nozzle setting even with a large nozzle extension.
• the first wall of the first housing is preferably oriented perpendicular to the second wall of the first housing.
• the nozzle is formed between plane-parallel surfaces, one of which is arranged on the bar and the other on the second wall of the first housing.
• the arrangement can be such that the two housings form an upright assembly which is arranged perpendicular to the material to be cooled, the first wall of the first housing being angled by 40 ° to 50 °, so that the flat jet is also at an angle strikes the material to be cooled from 40 ° to 50 °.
• FIG. 1 a vertical section through a device according to the invention.
• the device is used to generate a flat jet, which is directed against a radiant sheet 1.
• the steel sheet 1 is transported from left to right in FIG. 1.
• the width of the flat jet, measured perpendicular to the plane of the drawing in FIG. 1, is five meters.
• the device has a first housing 2 made of cast steel, which extends over the entire width of the flat jet. It essentially consists of a first wall 3 and a second wall 4, which are connected to one another via cast webs 5 and end walls (not shown).
• a bar 6 is arranged on the outer surface of the first wall 3 and forms a flat jet nozzle with the second wall 4.
• the first wall 3 is angled, and the second wall 4 is guided so that it forms a right angle with the first wall 3 in the nozzle area. This configuration results in the angle at which the flat jet strikes the steel sheet 1.
• the length of the nozzle is 20 mm in the present case. This ensures that the thickness of the flat jet widens only insignificantly after it emerges from the nozzle.
• the cast webs 5 end at a distance in front of the nozzle which corresponds to a multiple of the nozzle length. The disturbances in the flow of the cooling medium caused by the casting webs 5 have therefore already subsided when the cooling medium enters the nozzle. The result is a very even formation of the flat jet.
• the arrangement of the strip 6 on the outer surface of the first wall 3 of the first housing 2 contributes to increasing the stability of the first housing 2.
• the arrangement is such that the strip 6 rests on the outer surface of the first wall 3 in a metal-sealing manner. Leaks that could lead to a disturbance of the flat jet are thus avoided.
• the strip 6 is clamped against the outer surface of the first wall 3 by means of a screw 7.
• the strip 6 is supported on a shoulder 8 protruding from the first wall 3 of the first housing 2.
• the height of the nozzle gap is determined by a washer 9, which is arranged between the bar 6 and the shoulder 8 and is fixed by an additional screw 10. If the nozzle is changed, the washer 9 is replaced.
• the first housing 2 is screwed to a second housing 11 at a distance from the bar 6.
• the latter also consists of cast steel and extends in one piece, like the first housing 2, over the entire width of the flat jet. Inside the second housing 11 is also provided with cast webs 12.
• a distributor plate 13 is clamped between the two housings 2 and 11. It has through openings 14 for the cooling medium.
• the two steel housings 2 and 11 form a rigid connection with the interposition of the distributor plate 13, which remains dimensionally stable even under the prevailing thermal loads.
• the flat jet can therefore strike the steel sheet 1 undisturbed and in a defined formation. This allows an opti- achieve a cool result, which results in high material quality.
• the second housing 11 is provided with a plurality of connections 15 for introducing the coolant.
• the coolant enters the interior of the second housing 11 and is distributed uniformly over the width of the jet by the distributor plate 13. It then passes through the passage openings 14 into the interior of the first housing 2 and at the outlet end thereof into the flat jet nozzle.
• the arrangement is such that the connections 15 as a whole define a passage area which corresponds at least to the sum of the passage areas of the passage openings 14, the distribution of the cooling medium improving with increasing ratio.
• the extension of the second housing in the flat jet width direction does not necessarily have to correspond to that of the first housing, although identical dimensions are preferred in terms of the stability of the overall arrangement.
• the cast webs of the first and / or the second housing can optionally be dispensed with.
• the stability of the arrangement is promoted, in particular in the case of wide flat jets, by the casting webs.
• the cast webs also perform a function as flow control devices. The latter also applies to the distributor plate.
• the metallic seal between the strip and the first housing can be replaced or supplemented by an inserted sealing element.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Heat Treatments In General, Especially Conveying And Cooling (AREA)
• Heat Treatment Of Strip Materials And Filament Materials (AREA)
• Nozzles (AREA)
• Constitution Of High-Frequency Heating (AREA)

Applications Claiming Priority (3)

Publications (2)

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Cited By (1)

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• 2001
  • 2001-08-27 DE DE20114136U patent/DE20114136U1/de not_active Expired - Lifetime
• 2002
  • 2002-08-13 CN CNB028167406A patent/CN1263550C/zh not_active Expired - Fee Related
  • 2002-08-13 WO PCT/EP2002/009039 patent/WO2003018232A1/fr not_active Ceased
  • 2002-08-13 RU RU2004109151/02A patent/RU2294813C2/ru not_active IP Right Cessation
  • 2002-08-13 AT AT02796224T patent/ATE299765T1/de active
  • 2002-08-13 DE DE50203689T patent/DE50203689D1/de not_active Expired - Lifetime
  • 2002-08-13 KR KR10-2004-7003042A patent/KR20040035744A/ko not_active Abandoned
  • 2002-08-13 JP JP2003522733A patent/JP2005500169A/ja active Pending
  • 2002-08-13 EP EP02796224A patent/EP1420912B1/fr not_active Expired - Lifetime

Non-Patent Citations (1)

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