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EP0021865B1 - Apparatus for cooling metal sheets or similar products - Google Patents

Apparatus for cooling metal sheets or similar products Download PDF

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Publication number
EP0021865B1
EP0021865B1 EP80400582A EP80400582A EP0021865B1 EP 0021865 B1 EP0021865 B1 EP 0021865B1 EP 80400582 A EP80400582 A EP 80400582A EP 80400582 A EP80400582 A EP 80400582A EP 0021865 B1 EP0021865 B1 EP 0021865B1
Authority
EP
European Patent Office
Prior art keywords
machine
enclosure
sheets
discharge circuit
cooling
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.)
Expired
Application number
EP80400582A
Other languages
German (de)
French (fr)
Other versions
EP0021865A1 (en
Inventor
Alfred Germain
Georges Bonamour Du Tartre
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.)
USINOR SA
Original Assignee
Union Siderurgique du Nord et de lEst de France SA USINOR
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Union Siderurgique du Nord et de lEst de France SA USINOR filed Critical Union Siderurgique du Nord et de lEst de France SA USINOR
Publication of EP0021865A1 publication Critical patent/EP0021865A1/en
Application granted granted Critical
Publication of EP0021865B1 publication Critical patent/EP0021865B1/en
Expired legal-status Critical Current

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Classifications

    • 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
    • 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 present invention relates to machines for cooling or quenching sheets or the like, in particular a machine as described in French patent No. 2,223,096 filed March 26, 1973 by the same Applicant.
  • Such a machine comprises a lower frame and an upper frame in which are mounted sets of rollers for driving and guiding the sheet, operating in pairs, these frames delimiting an enclosure in which a cooling fluid circulates.
  • this enclosure also surrounds the drive and guide rollers and the arrivals and departures of the cooling fluid take place at the level of these rollers.
  • the supply and the evacuation of the coolant takes place at different sets of rollers, the evacuation being carried out in particular at the level of the sets of rollers located, respectively, in the vicinity of the inlet ends and the machine. It is indeed desirable to carry out the evacuation as close as possible to the ends so as to avoid significant leaks of the cooling liquid during the entry and exit of the sheet and also during operation.
  • the object of the invention is to provide this machine with an improvement which makes it possible to reduce the importance of such leaks at the inlet ends and out of the machine.
  • the subject of this invention is a machine for cooling sheets, comprising a lower frame and an upper frame delimiting an enclosure, in which a coolant circulates, sets of drive and guide roller rollers mounted in the frame of so as to define a horizontal passage plane of said sheets between an inlet and an outlet of the enclosure, a coolant supply circuit connected to said enclosure, a lower coolant discharge circuit associated with the lower frame and an upper evacuation circuit associated with the upper frame, said circuits comprising in particular conduits which open into the enclosure in the vicinity of the inlet and the outlet thereof, said machine further comprising a tank for recovering the liquid of cooling to which the evacuation and supply circuits are connected, this tank being located below the level of the sheet passage plane, characterized in that the upper evacuation circuit forms a siphon and comprises a priming means intended to establish a vacuum in the siphon and in that the evacuation circuit comprises means for adjusting the flow rate.
  • the drawings show a general type of cooling machine as described in French Patent No. 2,223,096.
  • This machine comprises, in the example shown, five sets of guide and drive rollers defining a passage plane roughly horizontal for the sheets, the lower rollers 1 being carried by a lower, fixed frame 2, while the upper rollers 3 are carried by an upper movable frame 4, in particular for adjusting the height and possibly for placing the machine in inactive position.
  • the lower and upper frames delimit an enclosure 5 in which the cooling fluid, in this case water, circulates, and which bypasses the guide and drive rollers.
  • the supply of coolant and the evacuation of this liquid take place via conduits which open into the enclosure in line with the drive rollers.
  • the supply circuit comprises two collectors 10, 11 arranged at the bottom of a recovery tank R and from which extend pipes 12, 13 connected respectively to other collectors 14, 15 parallel to the rollers, arranged above and below the upper and lower frames and connected to the enclosure by approximately vertical supply conduits 16, 17.
  • suitable pumping means are provided to supply the coolant but have not been shown in the drawing.
  • the upper evacuation means also include conduits 22 disposed approximately vertically and connected to horizontal collectors 23 parallel to the drive and guide rollers. As can be seen in fig. 1 and 3 these collectors are connected by flexible pipes 24 to a common manifold 25 disposed parallel to the longitudinal direction of the machine. This collector is itself connected by a pipe 26 to the recovery tank.
  • the whole of the upper evacuation device therefore constitutes a siphon and on the common collector 25 is provided a priming device constituted here by an ejector connected to a source of pressurized air.
  • a priming device constituted here by an ejector connected to a source of pressurized air.
  • other means equivalents could be used to perform this priming function.
  • valves 21 placed on the lower evacuation conduits 20 make it possible to increase the pressure drop in the machine and to adjust this pressure drop so that the coolant tends to rise in the upper exhaust ducts.
  • the valves 21 also make it possible to carry out an adaptation as a function of the width of the sheet, by compensating for the variation in pressure drop which results from the passage of sheets of different widths.
  • the means used are particularly simple to implement and their cost is not very high.
  • flexible pipes are provided in the upper supply and discharge devices to allow adjustment and displacement in height of the upper frame so as not to interfere with the normal operation of the machine.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Advancing Webs (AREA)
  • Paper (AREA)

Description

La présente invention concerne les machines pour le refroidissement ou la trempe de tôles ou produits analogues, notamment une machine telle que décrite dans le brevet français n° 2 223 096 déposé le 26 mars 1973 par la même Demanderesse.The present invention relates to machines for cooling or quenching sheets or the like, in particular a machine as described in French patent No. 2,223,096 filed March 26, 1973 by the same Applicant.

Une telle machine comprend un bâti inférieur et un bâti supérieur dans lesquels sont montés des jeux de rouleaux d'entraînement et de guidage de la tôle, fonctionnant par paires, ces bâtis délimitant une enceinte dans laquelle circule un fluide de refroidissement. Suivant un mode de réalisation, cette enceinte entoure également les rouleaux d'entraînement et de guidage et les arrivées et les départs du fluide de refroidissement s'effectuent au droit de ces rouleaux. De préférence, l'alimentation et l'évacuation du liquide de refroidissement s'effectuent au niveau de jeux de rouleaux différents, l'évacuation étant réalisée en particulier au niveau des jeux de rouleaux situés, respectivement, au voisinage des extrémités d'entrée et de sortie de la machine. Il est en effet souhaitable de réaliser l'évacuation aussi près que possible des , extrémités de façon à éviter des fuites importantes du liquide de refroidissement lors de l'entrée et de la sortie de la tôle et également en cours de fonctionnement.Such a machine comprises a lower frame and an upper frame in which are mounted sets of rollers for driving and guiding the sheet, operating in pairs, these frames delimiting an enclosure in which a cooling fluid circulates. According to one embodiment, this enclosure also surrounds the drive and guide rollers and the arrivals and departures of the cooling fluid take place at the level of these rollers. Preferably, the supply and the evacuation of the coolant takes place at different sets of rollers, the evacuation being carried out in particular at the level of the sets of rollers located, respectively, in the vicinity of the inlet ends and the machine. It is indeed desirable to carry out the evacuation as close as possible to the ends so as to avoid significant leaks of the cooling liquid during the entry and exit of the sheet and also during operation.

On a pu cependant constater que, malgré cette précaution, des fuites se produisent et le but de l'invention est d'apporter à cette machine un perfectionnement qui permette de diminuer l'importance de telles fuites au niveau des extrémités d'entrée et de sortie de la machine.However, it has been observed that, despite this precaution, leaks occur and the object of the invention is to provide this machine with an improvement which makes it possible to reduce the importance of such leaks at the inlet ends and out of the machine.

Cette invention a pour objet une machine pour le refroidissement de tôles, comprenant un bâti inférieur et un bâti supérieur délimitant une enceinte, dans laquelle circule un liquide de refroidissement, des jeux de rouleaux d'entraînement et de guidage des tôles montés dans les bâtis de manière à définir un plan de passage horizontal desdites tôles entre une entrée et une sortie de l'enceinte, un circuit d'alimentation en liquide de refroidissement relié à ladite enceinte, un circuit inférieur d'évacuation du liquide de refroidissement associé au bâti inférieur et un circuit supérieur d'évacuation associé au bâti supérieur, lesdits circuits comportant notamment des conduits qui débouchent dans l'enceinte au voisinage de l'entrée et de la sortie de celle-ci, ladite machine comportant en outre un bac de récupération du liquide de refroidissement auquel sont reliés les circuits d'évacuation ed d'alimentation, ce bac étant situé en dessous du niveau du plan de passage de tôles, caractérisé en ce que le circuit d'évacuation supérieur forme un siphon et comporte un moyen d'amorçage destiné à établir une dépression dans le siphon et en ce que le circuit d'évacuation comporte des moyens de réglage de débit.The subject of this invention is a machine for cooling sheets, comprising a lower frame and an upper frame delimiting an enclosure, in which a coolant circulates, sets of drive and guide roller rollers mounted in the frame of so as to define a horizontal passage plane of said sheets between an inlet and an outlet of the enclosure, a coolant supply circuit connected to said enclosure, a lower coolant discharge circuit associated with the lower frame and an upper evacuation circuit associated with the upper frame, said circuits comprising in particular conduits which open into the enclosure in the vicinity of the inlet and the outlet thereof, said machine further comprising a tank for recovering the liquid of cooling to which the evacuation and supply circuits are connected, this tank being located below the level of the sheet passage plane, characterized in that the upper evacuation circuit forms a siphon and comprises a priming means intended to establish a vacuum in the siphon and in that the evacuation circuit comprises means for adjusting the flow rate.

L'invention va être décrite plus en détail ci-dessous en se référant au dessin annexé donné uniquement à titre d'exemple et sur lequel:

  • la fig. 1 est une vue schématique en coupe transversale suivant la ligne 1-1 de la fig. 2 d'une machine perfectionnée suivant l'invention, certaines parties étant arrachées;
  • la fig. 2 est une vue en coupe suivant la ligne 2-2 de la fig. 1;
  • la fig. 3 est une vue schématique de dessus suivant la flèche 3 visible sur la fig. 1.
The invention will be described in more detail below with reference to the appended drawing given solely by way of example and in which:
  • fig. 1 is a schematic view in cross section along line 1-1 of FIG. 2 of an improved machine according to the invention, certain parts being torn off;
  • fig. 2 is a sectional view along line 2-2 of FIG. 1;
  • fig. 3 is a schematic top view along arrow 3 visible in FIG. 1.

On voit sur les dessins une machine de refroidissement d'un type général tel que décrit dans le brevet français n° 2 223 096. Cette machine comprend dans l'exemple représenté cinq jeux de rouleaux de guidage et d'entraînement délimitant un plan de passage à peu près horizontal pour les tôles, les rouleaux inférieurs 1 étant portés par un bâti inférieur, fixe 2, tandis que les rouleaux supérieurs 3 sont portés par un bâti supérieur 4 mobile, en particulier pour réaliser un réglage en hauteur et éventuellement pour placer la machine en position inactive. Les bâtis inférieur et supérieur délimitent une enceinte 5 dans laquelle circule le fluide de refroidissement, en l'occurence de l'eau, et qui contourne les rouleaux de guidage et d'entraînement.The drawings show a general type of cooling machine as described in French Patent No. 2,223,096. This machine comprises, in the example shown, five sets of guide and drive rollers defining a passage plane roughly horizontal for the sheets, the lower rollers 1 being carried by a lower, fixed frame 2, while the upper rollers 3 are carried by an upper movable frame 4, in particular for adjusting the height and possibly for placing the machine in inactive position. The lower and upper frames delimit an enclosure 5 in which the cooling fluid, in this case water, circulates, and which bypasses the guide and drive rollers.

Dans l'exemple représenté l'alimentation en liquide de refroidissement et l'évacuation de ce liquide s'effectuent par des conduits qui débouchent dans l'enceinte au droit des rouleaux d'entraînement.In the example shown, the supply of coolant and the evacuation of this liquid take place via conduits which open into the enclosure in line with the drive rollers.

Le circuit d'alimentation comprend deux collecteurs 10, 11 disposés à la partie inférieure d'un bac de récupération R et à partir desquels s'étendent des canalisations 12, 13 reliées respectivement à d'autres collecteurs 14, 15 parallèles aux rouleaux, disposés au-dessus et au-dessous des bâtis supérieur et inférieur et reliés à l'enceinte par des conduits d'alimentation à peu près verticaux 16, 17. Bien entendu des moyens de pompage appropriés sont prévus pour assurer l'alimentation en liquide de refroidissement mais n'ônt pas été figurés sur le dessin.The supply circuit comprises two collectors 10, 11 arranged at the bottom of a recovery tank R and from which extend pipes 12, 13 connected respectively to other collectors 14, 15 parallel to the rollers, arranged above and below the upper and lower frames and connected to the enclosure by approximately vertical supply conduits 16, 17. Of course, suitable pumping means are provided to supply the coolant but have not been shown in the drawing.

L'alimentation s'effectuant au niveau des jeux de rouleaux de rang pair, l'évacuation s'effectue au niveau des jeux de rouleaux de rang impair disposés aux deux extrémités de la machine et dans la partie centrale de cette dernière. Ces moyens comprennent, à partir du bâti inférieur des conduits 18 s'étendant vers le bas et reliés à des collecteurs 19 parallèles aux rouleaux, eux-mêmes reliés par une canalisation distincte 20 au bac de récupération. Sur ces canalisations sont placées des vannes 21 permettant de régler le débit d'évacuation à partir de la partie inférieure de la machine et par conséquent la perte de charge dans la machine.Since the supply takes place at the level of sets of rolls of even rank, the discharge takes place at the level of sets of rolls of odd rank arranged at the two ends of the machine and in the central part of the latter. These means comprise, from the lower frame of the conduits 18 extending downwards and connected to manifolds 19 parallel to the rollers, themselves connected by a separate pipe 20 to the recovery tank. Valves 21 are placed on these pipes, making it possible to adjust the evacuation flow rate from the bottom of the machine and consequently the pressure drop in the machine.

Les moyens d'évacuation supérieurs comprennent également des conduits 22 disposés à peu près verticalement et reliés à des collecteurs horizontaux 23 parallèles aux rouleaux d'entraînement et de guidage. Comme on peut le voir sur les fig. 1 et 3 ces collecteurs sont reliés par des canalisations souples 24 à un collecteur commun 25 disposé parallèlement à la direction longitudinale de la machine. Ce collecteur est lui-même relié par une canalisation 26 au bac de récupération. L'ensemble du dispositif d'évacuation supérieur constitue donc un siphon et sur le collecteur commun 25 est prévu un dispositif d'amorçage constitué ici par un éjecteur relié à une source d'air sous pression. Bien entendu, d'autres moyens équivalents pourraient être utilisés pour remplir cette fonction d'amorçage.The upper evacuation means also include conduits 22 disposed approximately vertically and connected to horizontal collectors 23 parallel to the drive and guide rollers. As can be seen in fig. 1 and 3 these collectors are connected by flexible pipes 24 to a common manifold 25 disposed parallel to the longitudinal direction of the machine. This collector is itself connected by a pipe 26 to the recovery tank. The whole of the upper evacuation device therefore constitutes a siphon and on the common collector 25 is provided a priming device constituted here by an ejector connected to a source of pressurized air. Of course, other means equivalents could be used to perform this priming function.

Le fonctionnement de l'installation que l'on vient de décrire est le suivant: les vannes 21 placées sur les conduits d'évacuation inférieurs 20 permettent d'augmenter la perte de charge dans la machine et de régler cette perte de charge de façon que le liquide de refroidissement tende à monter dans les conduits d'évacuation supérieurs. L'éjecteur 27 placé sur le collecteur 25 assure l'amorçage du siphon que constitue le dispositif d'évacuation supérieur et, lorsque le siphon est amorcé, la pression ou la dépression aux extrémités de la machine, au niveau du plan de la ligne de passe de la tôle, est égale à p = h - ω , où h représente la hauteur de la ligne de passe au-dessus du plan d'eau du bac de récupération et w représente une fonction des pertes de charge dans les tuyauteries, les vannes et le corps de la machine.The operation of the installation which has just been described is as follows: the valves 21 placed on the lower evacuation conduits 20 make it possible to increase the pressure drop in the machine and to adjust this pressure drop so that the coolant tends to rise in the upper exhaust ducts. The ejector 27 placed on the collector 25 initiates the siphon that constitutes the upper evacuation device and, when the siphon is primed, the pressure or vacuum at the ends of the machine, at the plane of the line of sheet metal pass, is equal to p = h - ω, where h represents the height of the pass line above the water tank of the recovery tank and w represents a function of the pressure losses in the pipes, the valves and machine body.

On voit donc q¡le grâce à la présence du siphon et à celle des vannes placées sur les conduits d'évacuation inférieurs, on peut amener la pression J? à une valeur faible et positive aux extrémités de la machine de sorte que les fuites à ce niveau peuvent être réduites de façon très substantielle.It is thus seen q¡ the e due to the presence of the siphon and that of the valves placed on the lower exhaust ducts, one can bring the pressure J? at a low and positive value at the ends of the machine so that leaks at this level can be reduced very substantially.

Les vannes 21 permettent également de réaliser une adaptation en fonction de la largeur de la tôle, en compensant la variation de perte de charge qui résulte du passage de tôles de largeurs différentes.The valves 21 also make it possible to carry out an adaptation as a function of the width of the sheet, by compensating for the variation in pressure drop which results from the passage of sheets of different widths.

Par ailleurs, les moyens utilisés sont particulièrement simples à mettre en oeuvre et leur coût n'est pas très élevé.Furthermore, the means used are particularly simple to implement and their cost is not very high.

On notera également que des canalisations souples sont prévues dans les dispositifs d'alimentation et d'évacuation supérieurs pour permettre le réglage et le déplacement en hauteur du bâti supérieur de façon à ne pas gêner le fonctionnement normal de la machine.It will also be noted that flexible pipes are provided in the upper supply and discharge devices to allow adjustment and displacement in height of the upper frame so as not to interfere with the normal operation of the machine.

Claims (2)

1. A machine for cooling metal sheets, comprising a lower frame (2) and an upper frame (4) defining an enclosure (5), in which a cooling fluid circulates, a plurality of driving and guiding roll sets (1, 3) for the sheets, mounted on the frames so as to define a horizontal passage plane for the sheets between input and output ends of the enclosure, a cooling fluid feed circuit (10-17) connected to said enclosure, a lower cooling liquid discharge circuit (18-20) associated with the lower frame and an upper cooling fluid discharge circuit (22-26) associated with the upper frame, said circuits comprising in particular conduits (18, 22) opening in the enclosure (5) in the vicinity of the input and output ends thereof, said machine further comprising a cooling liquid recovery tank (R) to which the feed and discharge circuits are connected, said tank being located below the level of the passage plane of the sheets, characterized in that the upper discharge circuit is in the shape of a siphon and comprises a priming device (27) for creating a depression in said siphon and in that the discharge circuit comprises flow regulating means (21
2. A machine as claimed in claim 1, characterized in that said flow regulating means (21) are incorporated to the lower discharge circuit.
EP80400582A 1979-06-13 1980-04-28 Apparatus for cooling metal sheets or similar products Expired EP0021865B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7915107 1979-06-13
FR7915107A FR2458326A1 (en) 1979-06-13 1979-06-13 IMPROVING MACHINES FOR COOLING TOOLS OR SIMILAR PRODUCTS

Publications (2)

Publication Number Publication Date
EP0021865A1 EP0021865A1 (en) 1981-01-07
EP0021865B1 true EP0021865B1 (en) 1983-03-16

Family

ID=9226534

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80400582A Expired EP0021865B1 (en) 1979-06-13 1980-04-28 Apparatus for cooling metal sheets or similar products

Country Status (6)

Country Link
US (1) US4298188A (en)
EP (1) EP0021865B1 (en)
JP (1) JPS6036455B2 (en)
DE (1) DE3062323D1 (en)
FR (1) FR2458326A1 (en)
IT (1) IT1128470B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU559731B2 (en) * 1981-11-19 1987-03-19 Kawasaki Steel Corp. Continuously quenching steel plates
US4720310A (en) * 1981-11-26 1988-01-19 Union Siderurgique Du Nord Et De L'est De La France (Usinor) Process for effecting the controlled cooling of metal sheets
FR2565709B1 (en) * 1984-06-06 1987-01-16 Siderurgie Fse Inst Rech DEVICE FOR ADJUSTING THE FLOW OF A LIQUID IN A PIPE, IN PARTICULAR OF A COOLING LIQUID

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1998192A (en) * 1933-12-22 1935-04-16 Arthur B Haswell Means for guiding and cooling rolled metal
US3792844A (en) * 1972-05-31 1974-02-19 G Berry Quenching method and apparatus
FR2223096B1 (en) * 1973-03-26 1976-09-10 Usinor
US3897230A (en) * 1973-05-09 1975-07-29 Inland Steel Co Cooling system
US3990257A (en) * 1973-05-09 1976-11-09 Inland Steel Company Method for cooling workpieces in a liquid bath

Also Published As

Publication number Publication date
IT1128470B (en) 1986-05-28
FR2458326A1 (en) 1981-01-02
JPS6036455B2 (en) 1985-08-20
EP0021865A1 (en) 1981-01-07
DE3062323D1 (en) 1983-04-21
IT8067787A0 (en) 1980-05-19
FR2458326B1 (en) 1983-03-11
US4298188A (en) 1981-11-03
JPS5638417A (en) 1981-04-13

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