EP3370025B1 - Dispositif et procédé de refroidissement d'un objet plat - Google Patents

Dispositif et procédé de refroidissement d'un objet plat Download PDF

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Publication number
EP3370025B1
EP3370025B1 EP18158006.9A EP18158006A EP3370025B1 EP 3370025 B1 EP3370025 B1 EP 3370025B1 EP 18158006 A EP18158006 A EP 18158006A EP 3370025 B1 EP3370025 B1 EP 3370025B1
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EP
European Patent Office
Prior art keywords
flat product
passage
outlet opening
passage gap
width
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18158006.9A
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German (de)
English (en)
Other versions
EP3370025A1 (fr
Inventor
Bora Özkan
Dominikus Schröder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LOI Thermprocess GmbH
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LOI Thermprocess GmbH
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Filing date
Publication date
Application filed by LOI Thermprocess GmbH filed Critical LOI Thermprocess GmbH
Priority to PL18158006T priority Critical patent/PL3370025T3/pl
Publication of EP3370025A1 publication Critical patent/EP3370025A1/fr
Application granted granted Critical
Publication of EP3370025B1 publication Critical patent/EP3370025B1/fr
Active legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F27D15/0206—Cooling with means to convey the charge
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/60—Aqueous agents
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C21D9/5735—Details
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C21D9/5735—Details
    • C21D9/5737—Rolls; Drums; Roll arrangements
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals

Definitions

  • the invention relates to a device for cooling a flat product, with transport means for the continuous transport of the flat product in the flow direction, with at least one upper nozzle body which has at least one first nozzle outlet opening for applying a liquid coolant to the top of the flat product across its width and with at least one lower nozzle Nozzle body which has at least one second nozzle outlet opening for subjecting the underside of the flat product to the liquid coolant over its width.
  • a device and a method of the type mentioned are from the EP 1210883 A1 known.
  • the EP 1210883 A1 describes different cooling options for a flat product in the form of a band made of steel by means of cooling water which is sprayed from cooling elements onto the top and bottom of the band.
  • a water breaker element or a water breaker roller is arranged, which is intended to displace the cooling water from the surface of the belt so that it flows off to the side .
  • water is jetted laterally or against the direction of flow of the belt in order to displace the coolant.
  • JP H02 54788 A a device is known in which rollers with outlet openings for air are arranged above and below a flat product or strip at a distance from this. From the outlet openings, air is released under high pressure against the direction of movement or the direction of flow of the Band on its top and bottom. Cooling water, which is located on the top or bottom of the belt, can be displaced from the top and bottom of the belt by means of the air against the direction of flow of the belt.
  • the flat products can consist of various materials.
  • An important field of application is the heat treatment of flat products, in particular heavy steel plates, which are used, for example, for the manufacture of cranes.
  • the heavy plates are heated in an industrial furnace for heat treatment, in particular for hardening in heat treatment systems, and then cooled or quenched in a continuous process.
  • By cooling or quenching heated steel its mechanical properties, such as hardness or tensile strength in particular, can be changed in a targeted manner.
  • the heated metal sheet is continuously transported in the direction of passage through the cooling device by means of transport means, which are usually designed as upper and lower transport rollers.
  • transport means which are usually designed as upper and lower transport rollers.
  • the sheet metal runs between the upper and lower transport rollers, which are arranged in pairs at a distance from one another in the direction of passage.
  • Heavy plates usually have a thickness of 2mm to 250mm.
  • the sheets which were initially heated or heated to austenitizing temperature, typically to 800 ° C to 950 ° C, are cooled very quickly in a continuous process with a cooling medium, usually water, using full jet nozzles in order to create a martensitic or bainitic structure .
  • a cooling medium usually water
  • both the top and the bottom of the metal sheets must be uniformly cooled or quenched in the same way.
  • the course of the cooling on the upper side of the sheet must be congruent with the course of the cooling on the underside, because otherwise internal stresses occur, which usually lead to warping of the sheets.
  • full jet nozzles usually nozzle bodies with a slot-shaped nozzle opening
  • nozzles are also called slot nozzles.
  • the liquid coolant emerges as a flat full jet, ie the impingement surface of the coolant jet on the surface of the flat product is essentially rectangular and runs transversely to the direction of flow.
  • the nozzle outlet opening can extend over the entire width of the sheet metal. It is known from practice to use three nozzle outlet openings arranged next to one another in a row over the width of the sheet in order to be able to cool the sheet edges in a more targeted manner.
  • a device for cooling plate-shaped or web-shaped sheet metal made of steel by means of a flat full jet which is directed at the flat product to be cooled is, for example, from EP 1420912 B1 known.
  • a nozzle body has a connection for introducing a liquid coolant into a nozzle outlet opening from which the cooling medium emerges.
  • the nozzle outlet opening is formed between plane-parallel surfaces.
  • the interior of the nozzle body is designed in such a way that the cooling medium does not hit the sheet metal vertically, but at an angle at an angle of attack.
  • the coolant usually water
  • the coolant has to act on the sheet metal to be quenched with a high exit pulse. Therefore the water is under increased pressure.
  • a water vapor film would prevent direct contact of the sheet metal surface with the water and significantly reduce the quenching speed.
  • Cooling water High throughputs of cooling water are required to quench heavy plates made of steel in a continuous process.
  • the cooling water must be discharged from the top and the bottom of the sheet after it has hit the top and bottom of the sheet.
  • roller in devices for cooling heavy plates downstream of the point of impact of the cooling water in the flow direction, which roller can be designed as a disc roller or a spiral roller in order to discharge the cooling water.
  • a device for quenching hot metal plates is known, in which a roller with spirals is used to discharge the cooling water.
  • the known rollers In addition to discharging the cooling water, the known rollers also serve to transport and / or hold the flat product in one plane and therefore rest on the flat product and engage on its top and bottom. With the known rollers pressure is usually exerted on the sheet metal, i. H. forces are transmitted to the sheet metal, in particular to avoid warping of the sheet metal.
  • the known rollers have passage cross-sections for the cooling water between the disks or the spirals in order to discharge the cooling water, which accumulates upstream of the roller, in the direction of passage by means of disks or spirals obliquely outwards over the longitudinal edges of the sheet.
  • the passage cross-sections for the cooling water formed between the disks or spirals are large in order to be able to transport large amounts of cooling water away in a very short time.
  • the quality achieved on cooling i.e. H. the uniformity with which the desired properties are achieved is decisively determined by how precisely in time and spatially uniform the heat is dissipated from the flat product. Small deviations from the ideal quenching process can lead to considerable fluctuations in the mechanical properties of the quenched material, particularly steel.
  • the bluish discoloration on the surface of the sheet occurs as a result of oxidation and is not only visually disadvantageous, which has an effect on the sales properties, but also has the technological disadvantage that the hardness of the sheet is significantly lower than intended due to the slow cooling speeds.
  • the demands on the quality of sheet metal are constantly increasing, so that differences in hardness are a serious problem.
  • the object of the invention is accordingly to improve a device and a method of the type mentioned in such a way that quality problems, in particular streaking on the top and bottom of the flat product and / or different material properties, in particular differences in hardness, are avoided with high cooling intensity.
  • An upper passage gap extends over the width of the flat product, preferably over the entire width of the flat product, and the liquid coolant on the upper side of the flat product can flow through it in the flow direction during the cooling process.
  • a lower passage gap extends over the width of the flat product, preferably over the entire width of the flat product, and the liquid coolant on the underside of the flat product can flow through it in the flow direction during the cooling process.
  • the upper passage gap is arranged downstream of the first nozzle outlet opening on the top and the lower passage gap is arranged downstream of the second nozzle outlet opening on the underside in the flow direction, the passage gap being spaced from the nozzle outlet opening.
  • the upper and lower elements have grooves which are spaced apart from one another by means of webs.
  • the upper passage gap is delimited by an upper element and the lower passage gap is delimited by a lower element, which extend transversely to the direction of passage of the flat product.
  • the upper and the lower element are at a distance from the flat product and, together with the flat product, delimit the upper and lower passage gap for the coolant.
  • there is an upper passage gap which extends over the width of the flat product, preferably over the entire length
  • Width of the flat product extends, formed in the vertical direction between the flat product and the upper element and is flowed through by the coolant on the top of the flat product during the cooling process in the flow direction.
  • the upper passage gap is thus delimited in the vertical direction upwards by the upper element and downwards by the flat product.
  • a lower passage gap is formed, which extends over the width of the flat product, preferably over the entire width of the flat product and which from the coolant on the underside of the flat product is flowed through in the flow direction (D) during the cooling process.
  • the lower passage gap is thus delimited in the vertical direction upwards by the flat product and downwards by a lower element.
  • the upper passage gap is arranged downstream of the first nozzle outlet opening on the upper side of the flat product in the flow direction (D).
  • the first nozzle outlet opening is located upstream of the first passage gap.
  • the lower passage gap is arranged downstream of the second nozzle outlet opening on the underside of the flat product in the flow direction (D).
  • the second nozzle outlet opening is located upstream of the second passage gap.
  • a cooling zone with high heat transfer is formed on the top and the bottom.
  • gap-shaped passage gaps or free passage cross-sections for the coolant are formed on the top and bottom in order to increase and even out the flow rate of the coolant downstream of the point of impact of the coolant on the top and bottom of the flat product.
  • the upper and the lower element do not attack the flat product, so that no forces are transmitted to the flat product.
  • the upper and lower elements serve to guide or channel the coolant into the respective passage gap.
  • the invention is based on the knowledge that liquid coolant, which flows through the passage gap parallel to the hot surface of the flat product is accelerated and thus flows through the passage gap with a high flow velocity, leads to optimal quenching conditions.
  • the invention simultaneously solves the problem of unequal cooling conditions. Bluish discoloration does not occur during the cooling process. Tests have shown that the flat product is also very flat after cooling.
  • the flat product is preferably transported through the device for cooling by means of a roller conveyor in which the transport means are designed as a plurality of upper and lower transport rollers which are at a distance from one another in the direction of passage.
  • the transport rollers attack the flat product and continuously transport the flat product through the device for cooling.
  • the upper passage gap is preferably arranged downstream of the first nozzle outlet opening and the lower passage gap is arranged downstream of the second nozzle outlet opening in the direction of passage at a predefined distance.
  • the predefined distance between the first nozzle outlet opening and the upper passage gap or between the second nozzle outlet opening and the lower passage gap essentially corresponds to half the distance between two transport rollers or pairs of transport rollers that are adjacent in the direction of passage, between which the flat product is located.
  • the upper and the lower passage gap each preferably have a free passage cross section of the same size for the coolant over the entire width of the flat product, so that the flow rate is constant over the width of the flat product. Consequently, the cross section of the upper and lower passage gap is the same or constant over the width of the flat product.
  • the passage cross-section of the upper and the lower passage gap can increase steadily starting from the center of the flat product towards its lateral edges. In this way, the speed of the coolant can be optimized in the area of the lateral edges or edges.
  • the height of the lower and the upper passage gap is selected such that the flow rate of the coolant increases to a predefined flow rate during the passage of the coolant through the passage gap.
  • the upper and the lower passage gap preferably have a predefined height, the height being 3 mm to 10 mm, preferably 5 mm.
  • the predefined height relates to the lowest height in the middle of the flat product.
  • the height of the upper passage gap is the vertical distance between the top of the flat product and the upper element.
  • the height of the lower passage gap corresponds to the vertical distance between the underside of the flat product and the lower element.
  • the upper element and the lower element can be plate-shaped.
  • the plate-shaped element can have an inlet area which directs the coolant in the direction of the passage gap.
  • the upper and the lower element are preferably designed in the form of rollers or as rollers, which are preferably rotatable.
  • the roller-shaped upper element and roller-shaped lower element can be driven at the same speed as the transport rollers, so that the flow of the coolant in the direction of the passage gap is favored.
  • the upper and lower element which can be plate-shaped or roll-shaped, can run parallel to the flat product adjacent to the upper and lower passage gap.
  • the height of the respective passage gap is constant or the same size over the width of the flat product.
  • the upper and lower element can have a profile that changes continuously over the width starting from the center of the flat product towards the lateral edges of the flat product, such that the upper and lower passage cross-section increases steadily in the direction of the lateral edges of the flat product .
  • the upper element and the lower element are mounted in a height-adjustable manner parallel to the flat product. In this way, the height of the upper and the lower passage gap can be changed and thus the free passage cross section of the passage gap can be changed.
  • a plurality of grooves are preferably arranged in parallel and at a distance from one another over the entire width of the upper and lower element.
  • the grooves are notch-like depressions.
  • coolant which could accumulate in front of the upper and lower element in the case of very high coolant throughputs, is better discharged so that the coolant does not get into system areas where it is disturbing, in particular the coolant flowing back towards the industrial furnace avoided.
  • the grooves preferably extend in the direction of passage. It is also possible that the grooves are spiral-shaped in order to discharge the coolant obliquely outwards. In the context of the invention, some of the grooves can extend in the direction of passage and some of the grooves can be spiral-shaped.
  • the coolant is optimally discharged without different cooling speeds occurring.
  • the ridges are wider than the grooves, i. H. the width of the groove is smaller than the width of the land.
  • the ratio of the groove width to the land width is preferably between 1 to 1.5 (1: 1.5) and 1 to 6 (1: 6), particularly preferably about 1 to 3 (1: 3).
  • the cross-section of the grooves can be shaped as desired and is preferably rectangular, square or sawtooth-shaped. In a preferred embodiment, the cross section of the grooves is rectangular.
  • the width-height ratio of the grooves is preferably between 1: 0.5 (1: 0.5) and 1: 1.5 (1: 1.5), preferably 1: 0.8 (1: 0.8) .
  • the grooves have a groove base and two opposing side walls, the transition areas between the groove base and the side walls being rounded and / or the groove base being rounded.
  • the groove bottom of the grooves can, for example, have the shape of a curve.
  • the corners and the transition areas of the side walls and the bottom of the grooves of the grooves are preferably rounded in order to optimize the flow properties.
  • a preferred embodiment is characterized in that the first nozzle outlet opening and the second nozzle outlet opening are adjustable in height relative to the flat product and / or are designed so that the coolant is at an angle (a) between 10 ° and 45 °, preferably between 20 ° and 30 ° Top and bottom of the flat product hits in the direction of passage. As a result, when the coolant exits in the flow direction behind the respective nozzle outlet opening, it hits the top or the bottom.
  • An upper guide device can preferably be provided on the upper side of the flat product and a lower guide device on the lower side in order to guide the coolant located on the upper side and the lower side in a targeted manner to the passage gaps.
  • Each of the two guide devices has a predefined distance from the top and bottom of the flat product and each forms a channel-shaped space for the coolant that is open at the edges of the flat product.
  • the flow of the coolant to be removed is impressed with a preferred direction in the direction of the passage gap. It is particularly advantageous if the distance between the upper and lower guide device and the top and bottom of the flat product can be adjusted. The distance of the upper guide device from the top can differ from the distance of the lower guide device from the bottom.
  • the upper and the lower passage gap are arranged at a predefined distance in the flow direction behind the first and the second nozzle outlet opening and are each formed by an upper and lower element, which extend on the bottom and the top of the flat product across its width.
  • the coolant emerging from the respective nozzle outlet opening is passed through gap-shaped passage gaps at a predefined distance from the point of impact, in order to increase and even out the flow rate of the coolant downstream of the point of impact of the coolant on the top and bottom of the flat product.
  • This leads to high heat transfer coefficients in the area of the passage gaps and thus to an optimal quenching effect. Because the flow rate of the coolant is the same across the width of the flat product, the formation of streaks and the occurrence of different material properties, in particular differences in hardness, are avoided.
  • the upper element and the lower element form flow obstacles on the underside and the upper side of the flat product in such a way that the coolant, which is respectively directed against the upper side and the underside of the flat product, is forced through a gap-shaped passage cross-section or to flow the gap-shaped constriction, which is formed because the upper and the lower element are each arranged spaced apart in the vertical direction from the flat product.
  • the flow speed of the coolant when exiting the first and second nozzle outlet openings is preferably between 5 m / s and 60 m / s, preferably between 20 m / s and 35 m / s.
  • the speed of the coolant jet at the outlet from the nozzle outlet opening corresponds essentially to the impact speed of the coolant on the flat product.
  • the height of the gap-shaped passage gap or the passage cross-section is selected such that the flow rate of the coolant increases during the passage.
  • the coolant that emerges from the first or second nozzle outlet opening preferably hits the flat product at an angle of incidence.
  • the coolant can hit the top and bottom of the flat product at an angle ( ⁇ ) between 10 ° and 45 °, preferably between 20 ° and 30 °.
  • the first and second nozzle outlet openings are designed so that the angle ( ⁇ ) can be adjusted.
  • Fig. 1 shows schematically a device according to the invention for cooling a flat product in the form of a heavy plate made of steel with water as the coolant.
  • the connection is used to introduce the water into at least one first nozzle outlet opening 3, which is directed towards the top 4 of a metal sheet 1.
  • the upper first nozzle outlet opening 3 is designed as a slot and extends transversely to the direction of passage D over the entire width of the sheet 1.
  • the first nozzle outlet opening 3 is designed in such a way that the cooling water exiting at an angle ⁇ as a flat full jet onto the top 4 of the sheet 1 is directed.
  • the angle ⁇ is preferably between 20 ° and 30 °.
  • Transport means in the form of upper transport rollers 5 and lower transport rollers 5 'are used to continuously transport the sheet metal 1 in the direction of passage D.
  • an upper element 6 in the form of a roller is arranged on the top side 4 of the sheet metal 1 in the direction of passage D.
  • the distance A relates to the center of the roller-shaped upper element 6.
  • the roller-shaped upper element 6 runs parallel to the sheet 1, transversely to the direction of passage D over the entire width of the sheet 1 and is mounted adjustable in height in a manner not shown.
  • the roller-shaped upper element 6 does not attack the flat product. No forces are transmitted to the flat product 1 from the upper element 6.
  • a passage gap 7 for the coolant 8, which is shown hatched, is formed between the roller-shaped upper element 6 and the upper side 4 of the sheet metal 1.
  • the height H of the passage gap 7 is adjustable or adjustable.
  • the roller-shaped upper element 6 is rotatable and is preferably driven at the same speed as the transport rollers 5, 5 '.
  • the height H of the upper passage gap 7 is relatively small and is preferably between 3 mm and 10 mm, particularly preferably 5 mm.
  • a lower nozzle body 2 ′ has a second nozzle outlet opening 3 ′, which is designed as a slot and extends transversely to the direction of passage D over the entire width of the sheet metal 1.
  • a lower element 6' in the form of a roller is arranged on the underside 9 of the metal sheet 1 in the direction of passage D.
  • the lower roller-shaped element 6 ' runs parallel to the sheet 1 transversely to the direction of passage D over the entire width of the sheet 1 and is mounted so as to be adjustable in height in a manner not shown.
  • the distance A between the first nozzle outlet opening 3 and the upper passage gap 7 or the second nozzle outlet opening 3 'and the lower passage gap 7' corresponds essentially to half the distance R between two transport rollers or transport roller pairs 5, 5 'adjacent in the direction of passage D .
  • the flow speed of the coolant 8 on the top 4 and bottom 9 of the sheet metal 1 is thus spaced from the respective nozzle outlet opening 3, 3 'and thus spaced from the point of impact of the cooling water emerging from the respective nozzle outlet opening 3, 3' on the top 4 and the bottom 9 of the sheet 1 increased.
  • the upper and lower roller-shaped elements 6, 6 ' have grooves 10 which run in the direction of passage D and in Fig. 2 are shown.
  • Fig. 2 is a schematic representation of the roller-shaped element 6 for forming the passage gap 7 from Fig. 1 shown.
  • the lower roller-shaped element 6 ' is in Fig. 2 not shown because it is identical to the upper roller-shaped element 6.
  • the roller-shaped upper element 6 has grooves 10 which are spaced from one another by means of webs 11.
  • the grooves 10 are narrower than the webs 11.
  • the ratio B / C of the width B of the grooves 10 to the width C of the webs 11 is between 1: 1.5 (1: 1.5) and 1: 6 (1: 6).
  • the width C of the web 11 is approximately 3 times the width B of the grooves 10, which in the exemplary embodiment is 10 mm wide.
  • the free passage cross-section which is formed by the upper and lower passage gap 6, 6 ', is enlarged by 32%. Tests have shown that the cooling water can be optimally drained in this way.
  • Fig. 3 is a partial section of the roller-shaped element 6 from Fig. 2 shown.
  • the upper roller-shaped element 6 forms with the sheet metal 1 on its upper side 4 the upper passage gap 7 with a height H.
  • the height H of the upper passage gap 7 is 5 mm in the exemplary embodiment.
  • the cross-section of the grooves 10 is essentially rectangular.
  • the grooves 10 have a groove bottom 10a and two opposite side walls 10b and 10b '.
  • the transition areas between the groove bottom 10a and the side walls 10b, 10b 'of the grooves 10 are rounded in order to optimize the flow conditions.
  • the width-to-height ratio of the grooves 10 is between 1 to 0.5 (1: 0.5) and 1 to 1.5 (1: 1.5), preferably 1 to 0.8 (1: 0.8) .
  • Fig. 4 shows the roller-shaped element 6, 6 'in a perspective view Fig. 1 .
  • the upper and lower roller-shaped element 6, 6 'does not rest on the sheet metal 1, but rather serves to form the upper and lower passage gap 7, 7'.
  • Fig. 5 shows a schematic representation of a view of a second embodiment of a device according to the invention in the direction of passage D of the sheet metal 1.
  • a guide device 12 which channels the coolant 8.
  • the guide device 12 is at a distance from the top 4 of the metal sheet 1.
  • the predefined distance E of the guide device 12 from the top 4 of the metal sheet 1 is adjustable.
  • the guide device 12 extends over the width of the sheet metal 1 at least to the sheet metal edges and forms a channel-shaped space for the coolant 8 open at the sheet metal edges.
  • an identically constructed guide device 12 ' is arranged on the underside 9 of the sheet metal 1.
  • Fig. 5 illustrated embodiment differs from the embodiment according to Fig. 1 only through the guiding devices 12 and 12 '.
  • the upper element 6 and the lower element 6 ' can be plate-shaped.
  • the cross-section of the grooves 10 can be square or sawtooth-shaped.
  • the groove base 10a can also be designed to be round or curved. Besides water, any other suitable cooling medium can be used as the liquid coolant.

Claims (15)

  1. Dispositif de refroidissement d'un produit plat, avec des moyens de transport (5, 5') pour le transport continu du produit plat (1) dans un sens de passage (D),
    au moins un corps de buse supérieur (2), qui présente au moins un premier orifice de sortie de buse (3) pour soumettre la face supérieure (4) du produit plat (1) à un agent de refroidissement liquide (8) sur sa largeur,
    au moins un corps de buse inférieur (2'), qui présente au moins un deuxième orifice de sortie de buse (3') pour soumettre la face inférieure (9) du produit plat (1) à l'agent de refroidissement liquide (8) sur sa largeur,
    une fente de passage supérieure (7) qui s'étend sur la largeur du produit plat (1) et à travers laquelle l'agent de refroidissement liquide (8) peut s'écouler dans le sens de passage (D) sur la face supérieure (4) du produit plat (1) pendant le processus de refroidissement, la fente de passage supérieure (7) étant délimitée par un élément supérieur (6),
    une fente de passage inférieure (7') qui s'étend sur la largeur du produit plat (1) et à travers laquelle l'agent de refroidissement liquide (8) peut s'écouler dans le sens de passage (D) sur la face inférieure (9) du produit plat (1) pendant le processus de refroidissement, la fente de passage inférieure (7') étant délimitée par un élément inférieur (6'), la fente de passage supérieure (7) du premier orifice de sortie de buse (3) étant disposée sur la face supérieure (4) et la fente de passage inférieure (7') du deuxième orifice de sortie de buse (3') étant disposée sur la face inférieure (9) du produit plat (1) dans le sens de passage (D) et les éléments supérieur et inférieur (6, 6') présentant des gorges (10) qui sont espacées les unes des autres au moyen de nervures (11).
  2. Dispositif selon la revendication 1,
    caractérisé en ce que les moyens de transport (5, 5') sont réalisés sous la forme de rouleaux de transport supérieurs et inférieurs, qu'au moins deux rouleaux de transport supérieurs (5) et au moins deux rouleaux de transport inférieurs (5') sont disposés à un intervalle prédéfini l'un de l'autre dans le sens de passage et/ou que la fente de passage supérieure (7) est située après le premier orifice de sortie de buse (3) et la fente de passage inférieure (7') après le deuxième orifice de sortie de buse (3') à un intervalle prédéfini (A) dans le sens de passage (D) et/ou que, de préférence, l'intervalle (A) est sensiblement la moitié de la distance (R) entre deux rouleaux de transport (5, 5') voisins dans le sens de passage (D).
  3. Dispositif selon la revendication 1 ou 2,
    caractérisé en ce que la section transversale de passage des fentes de passage supérieure et inférieure (7, 7') est la même sur la largeur du produit plat (1) ou que la section transversale de passage des fentes de passage supérieure et inférieure (7, 7') s'agrandit continuellement du centre du produit plat (1) vers ses bords latéraux.
  4. Dispositif selon au moins l'une des revendications précédentes,
    caractérisé en ce que les fentes de passage supérieure et inférieure (7, 7') présentent une hauteur (H) et que la hauteur (H) des fentes de passage supérieure et inférieure (7, 7') est de 3 mm à 10 mm, de préférence de 5 mm.
  5. Dispositif selon au moins l'une des revendications précédentes,
    caractérisé en ce que les éléments supérieur et inférieur (6, 6') sont réalisés en forme de rouleau et sont de préférence rotatifs.
  6. Dispositif selon au moins l'une des revendications précédentes,
    caractérisé en ce que les éléments supérieur et inférieur (6, 6') s'étendent en profil parallèlement au produit plat (1) de manière adjacente aux fentes de passage supérieure et inférieure (7, 7') ou présentent un profil, qui change continuellement du centre du produit plat (1) sur la largeur vers les bords latéraux du produit plat (1), de telle sorte que la section transversale de passage des fentes de passage supérieure et inférieure (7, 7') s'agrandit continuellement en direction des bords latéraux du produit plat (1).
  7. Dispositif selon au moins l'une des revendications précédentes,
    caractérisé en ce que les éléments supérieur et inférieur (6, 6') sont montés de manière réglable en hauteur.
  8. Dispositif selon au moins l'une des revendications précédentes,
    caractérisé en ce que les gorges (10) s'étendent de préférence dans le sens de passage (D) et/ou sont de préférence en forme de spirale.
  9. Dispositif selon la revendication 8,
    caractérisé en ce que la section transversale de passage formée par les fentes de passage supérieure et inférieure (7, 7') est agrandie de 10 % à 250 %, de préférence de 40 %, au moyen des sections transversales de passage des gorges (10).
  10. Dispositif selon la revendication 8 ou 9,
    caractérisé en ce que la largeur (B) des gorges (10) est inférieure à la largeur (C) des nervures (11) et que le rapport (B/C) de la largeur de gorge (B) sur la largeur de nervure (C) est de préférence compris entre 1 sur 1,5 (1:1,5) et 1 sur 6 (1:6), particulièrement de préférence est de 1 sur 3 (1:3).
  11. Dispositif selon au moins l'une des revendications précédentes 8 à 10,
    caractérisé en ce que les gorges (10) présentent un fond de gorge (10a) et deux parois latérales opposées (10b, 10b') et que les zones de transition entre le fond de gorge (10a) et les parois latérales (10b, 10b') sont arrondies et/ou que le fond de gorge (10a) est arrondi.
  12. Dispositif selon au moins l'une des revendications précédentes,
    caractérisé en ce que le premier orifice de sortie de buse (3) et le deuxième orifice de sortie de buse (3') sont réglables en hauteur par rapport au produit plat (1) et/ou sont conçus de telle sorte que l'agent de refroidissement arrive sous un angle (a) compris entre 10° et 45°, de préférence entre 20° et 30°, sur la face supérieure (4) et la face inférieure (9) du produit plat (1) dans le sens de passage (D).
  13. Dispositif selon au moins l'une des revendications précédentes,
    caractérisé en ce qu'un dispositif de guidage supérieur (12) s'étend entre le premier orifice de sortie de buse (3) et l'élément supérieur (6), qu'un dispositif de guidage inférieur (12') s'étend entre le deuxième orifice de sortie de buse (3') et l'élément inférieur (6') afin de guider l'agent de refroidissement (8) se trouvant sur la face supérieure (4) et la face inférieure (9) vers la fente de passage supérieure (7) ou la fente de passage inférieure (7') respective.
  14. Procédé de refroidissement d'un produit plat, dans lequel le produit plat (1) est transporté en continu dans le sens de passage (D) par des moyens de transport (5, 5'), comprenant les étapes consistant à :
    - appliquer un agent de refroidissement liquide (8) sur la face supérieure (4) du produit plat (1) sur sa largeur au moyen d'au moins un corps de buse supérieur (2) qui présente au moins un premier orifice de sortie de buse (3),
    - appliquer un agent de refroidissement liquide (8) sur la face inférieure (9) du produit plat (1) sur sa largeur au moyen d'au moins un corps de buse inférieur (2') qui présente au moins un deuxième orifice de sortie de buse (3'),
    - guider l'agent de refroidissement liquide sur la face supérieure (4) dans le sens de passage (D) à travers une fente de passage supérieure (7) et guider l'agent de refroidissement liquide sur la face inférieure (9) dans le sens de passage (D) à travers une fente de passage inférieure (7') pour augmenter la vitesse d'écoulement de l'agent de refroidissement (8) dans le sens de passage (D), les fentes de passage supérieure et inférieure (7, 7') s'étendant chacune sur la largeur du produit plat (1) et étant situées après les premier et deuxième orifices de sortie de buse (3, 3') dans le sens de passage (D).
  15. Procédé selon la revendication 14,
    caractérisé en ce que la vitesse d'écoulement de l'agent de refroidissement (8) à la sortie des premier et deuxième orifices de sortie de buse (3, 3') est comprise entre 5 m/s et 60 m/s, de préférence entre 20 m/s et 35 m/s.
EP18158006.9A 2017-03-04 2018-02-22 Dispositif et procédé de refroidissement d'un objet plat Active EP3370025B1 (fr)

Priority Applications (1)

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PL18158006T PL3370025T3 (pl) 2017-03-04 2018-02-22 Urządzenie do chłodzenia wyrobu płaskiego oraz odnośny sposób

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017104550.3A DE102017104550A1 (de) 2017-03-04 2017-03-04 Einrichtung und Verfahren zum Abkühlen eines Flacherzeugnisses

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EP3370025A1 EP3370025A1 (fr) 2018-09-05
EP3370025B1 true EP3370025B1 (fr) 2020-09-09

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DE (1) DE102017104550A1 (fr)
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Publication number Priority date Publication date Assignee Title
DE102018126716A1 (de) * 2018-10-25 2020-04-30 Loi Thermprocess Gmbh Abkühl-Einrichtung zum Abkühlen von platten- oder bahnförmigem Blech aus Metall sowie Abkühlverfahren
DE102019101948A1 (de) * 2019-01-25 2020-07-30 Loi Thermprocess Gmbh Einrichtung und Verfahren zum Abkühlen von metallischem Blech

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Publication number Priority date Publication date Assignee Title
DE3313024A1 (de) 1983-04-12 1984-10-18 Babcock-BSH AG vormals Büttner-Schilde-Haas AG, 4150 Krefeld Verfahren und vorrichtung zum abschrecken von durchlaufenden stahlblechen, insbesondere von grob- oder mittelblechen, unter gleichzeitigem kontrolliertem richten
JPH0765203B2 (ja) * 1988-08-18 1995-07-12 川崎製鉄株式会社 鋼帯の水切り方法及び装置
WO2001064362A1 (fr) * 2000-03-01 2001-09-07 Nkk Corporation Dispositif et procede de refroidissement d'une bande d'acier laminee a chaud et procede de fabrication de cette bande d'acier laminee a chaud
DE20114136U1 (de) 2001-08-27 2001-11-29 Loi Thermprocess Gmbh Vorrichtung zum Kühlen von Material durch Erzeugen eines Flachstrahls
DE102013019619A1 (de) * 2013-11-25 2015-05-28 Loi Thermprocess Gmbh Verfahren zum Wärmebehandeln und Abschreckeinrichtung zum Kühlen von platten- oder bahnförmigem Blech aus Metall

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PL3370025T3 (pl) 2020-12-28
DE102017104550A1 (de) 2018-09-06
EP3370025A1 (fr) 2018-09-05
ES2824757T3 (es) 2021-05-13

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