EP2114584B1 - Device and method for cooling rolls used for rolling in a highly turbulent environment - Google Patents

Device and method for cooling rolls used for rolling in a highly turbulent environment Download PDF

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Publication number
EP2114584B1
EP2114584B1 EP07855376A EP07855376A EP2114584B1 EP 2114584 B1 EP2114584 B1 EP 2114584B1 EP 07855376 A EP07855376 A EP 07855376A EP 07855376 A EP07855376 A EP 07855376A EP 2114584 B1 EP2114584 B1 EP 2114584B1
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EP
European Patent Office
Prior art keywords
roll
cooling
rolling stand
front face
box
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EP07855376A
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German (de)
French (fr)
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EP2114584B8 (en
EP2114584A1 (en
Inventor
Hugo Uijtdebroeks
Patrick Van Poecke
Dirk Vanderschueren
Jean-François Noville
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Centre De Recherches Metallurgiques Asbl - Centrum
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Centre de Recherches Metallurgiques CRM ASBL
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Priority to PL07855376T priority Critical patent/PL2114584T3/en
Application filed by Centre de Recherches Metallurgiques CRM ASBL filed Critical Centre de Recherches Metallurgiques CRM ASBL
Publication of EP2114584A1 publication Critical patent/EP2114584A1/en
Publication of EP2114584B1 publication Critical patent/EP2114584B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames

Definitions

  • the present invention relates to a new method of cooling rolls (or rolls) rolling, optionally variable diameter, based on a highly turbulent flow regime (high turbulence , HTC).
  • the process is called high turbulence work roll cooling (HTRC).
  • the invention also relates to the device for implementing the method.
  • Document JP-A 03142009 discloses a rolling stand according to the preamble of claim 1.
  • the heating of the hot rolling rolls is due to the heat transfer to the rolls by conduction from the product, such as a metal strip, during rolling.
  • the cooling of the rolling rolls has been studied intensively because of the very strong influence thereof on the degradation of said rolls (wear) as a result of the thermomechanical fatigue generated and on the control of the cylinder crown. .
  • the degradation of the cylinders has a very great influence on the product quality.
  • Tubes or modules or cooling water tanks are equipped with sprayers and placed around each cylinder, with means for supplying cooling water.
  • cooling water guide plates In association with the upper cylinder and the lower cylinder are arranged cooling water guide plates. These plates are provided with a scraper, for example covered with rubber, associated with each of the cylinders to prevent water from flowing over the product being rolled.
  • An important problem to be solved in the case of working roll cooling is to obtain a uniform cooling over the width and the circumference.
  • a sensor such as an infrared thermometer (for example JP-A-12 24105 ).
  • Another solution is to use heads having water injection holes distributed in a suitable pattern, in the axial dimension and in the circumferential dimension ( JP-A-10 291011 ).
  • a third solution is to use a motorized sprinkler head on lateral guides ( EP-A-0 599 277 ).
  • the water can either be brought from one end of the head and evacuated from the other end ( JP-A-20 84205 ), be conveyed by both ends and be evacuated by the center ( EP-A-919,297 ), the evacuation being carried out through the head itself, scraper systems preventing leakage along the circumference of the rollers. Evacuation to the outside can still be done between one end of the head and the surface of the roll ( JP-A-11 277113 ).
  • a deformable cooling shoe is described by means of springs in order to be able to adapt to the surface of the roll.
  • the present invention aims to provide a solution to overcome the disadvantages of the state of the art.
  • this invention aims to provide efficient cooling of the rolling rolls while ensuring a reduction in thermomechanical fatigue and therefore less degradation of the roll surface.
  • Another object of the invention is to require, with equivalent heat exchange, a flow rate and a lower water pressure than the cooling systems of the state of the art, in particular those with flat jet.
  • Another object of the present invention is to design a cooling device capable of easily adapting to cylinders of variable diameter.
  • a first object of the present invention relates to a cooling device of a working cylinder belonging to a roll stand of a long or flat product, characterized in that it comprises a cooling head in the form of a substantially watertight box in itself, except on a front face being a short distance from said cylinder and in which a plurality of nozzles has been machined or positioned according to a two-dimensional drawing, said box, provided with means for supplying coolant, being concave and cylindrical at its front face with a radius such that, when the device is in the working position, the distance in the radial direction between said front face and the surface of the cylinder is increasing starting from the end of the caisson closest to the right-of-way and away from the product being rolled.
  • the cooling head is equipped with a transverse bottom plate arranged longitudinally with respect to the cylinder and located at a distance from the cylinder such that said bottom plate cooperates with the front face of the box, so as to ensure control of the flow of coolant and containment of it in the form of a highly turbulent water cushion.
  • This transverse bottom plate is mandatory in the case of small diameter cylinders.
  • the cooling head is further provided with adjustable side plates disposed on the side of the transverse ends of the cylinder and located at a distance from the cylinder such that said side plates cooperate with the front face of the box and with the transverse bottom plate, so as to to ensure the control of the coolant flow and confinement thereof in the form of a highly turbulent water cushion.
  • the curvature of the side plates corresponds to the maximum curvature of the cylinders used on the installation.
  • the front face comprises a plate or a sheet in which the sprinklers are positioned or machined, the orifices of which consist of small holes of right axial section.
  • the orifices of the nozzles are of round cross section, square or oval.
  • the radius of the cylindrical concave surface of the front face has a value greater than a predetermined maximum cylinder radius value, which limits the usable roll size range.
  • the machining pattern of the nozzles is chosen to make the cooling of the cylinder as homogeneous as possible over the entire surface of the cylinder and in particular over the width of the cylinder.
  • the machining pattern of the nozzles is defined by the number, the position and the diameter or the size of the orifices in the plate of said front face.
  • the orifices are machined according to a given network and the aforementioned drawing is obtained by closing certain orifices.
  • the coolant comprises water.
  • the coolant pressure in the box is less than 4 bar.
  • the coolant pressure is between 2 and 4 bar.
  • the distance between the lower transverse plate and the cylinder is adjusted so as to obtain a specific liquid flow rate in the gap between 2 and 10 m / s, and preferably greater than 3 m. / s.
  • the side plates are set to have a minimum opening of between 0 and 10 mm.
  • FIGS. 1A and 1B diagrammatically show two embodiments showing the principle of a working cylinder cooling head on a hot rolling line according to the state of the art (flat nozzles).
  • FIGS. 2A to 2D schematically show several embodiments showing the principle of such a cooling head in the case of the present invention (highly turbulent cooling).
  • the figure 3 graphically represents the evolution of the temperature over time, in different positions of the working cylinder respectively in a conventional installation at 8 bar of pressure and in the case of an HTRC installation according to the present invention, at 2.4 bars of pressure and with water guide plates.
  • the figure 4 shows an industrial layout of an HTRC cooling head.
  • the figure 5 shows graphically the cooling performance of the installation according to the invention at low pressure (only at the lower cylinder) compared to the high-pressure flat jet cooling, according to the state of the art.
  • the figure 6 shows the degradation of the surface of the upper and lower cylinders respectively in the case of 3 HTRC configurations and a configuration according to the state of the art.
  • the figure 7 shows the surface state of a cylinder after a rolling campaign using respectively cooling according to the state of the art (left) and cooling HTRC according to the present invention (right).
  • FIGS. 1A and 1B schematically show a cooling installation of working rolls in a rolling mill, according to the state of the art, with, in this example either nozzles mounted on independent tubes (FIG. 1A), or nozzles arranged on a module ( Figure 1B).
  • the pair of rollers has an upper roll 1 and a lower roll 2 rotating in opposite directions to advance the steel strip 3.
  • a cooling device 4A At the upper roll is a cooling device 4A, with its adjustment accessories, provided with nozzles Plates 40 facing the upper roller 1.
  • a cooling device 4B At the bottom roller is a cooling device 4B, with its adjustment accessories, provided with flat nozzles 40 facing the lower roller 2.
  • the nozzles are placed on 4 tubes whereas in the device of FIG. 1B, the nozzles are arranged in a module 4A, 4B.
  • the distance between the nozzles and the cylinder is 150-500 mm, which does not allow to use cylinders of different diameters with a single cooling device.
  • the cooling head is designed to implement the WPC technology, that is, to create a highly turbulent water cushion between the cooling head and the working roll surface. Turbulence is caused by low water injection pressure in the water cushion through jet sprinklers developed by the Applicant.
  • the cooling installation according to the invention consists of an upper box 6A facing the upper roller 1 and a lower box 6B facing the lower roller 2.
  • Each box 6A, 6B comprises a concave surface 42 screwed to the corresponding roller 1, 2.
  • This concave surface 42 consists of a wall provided with a plurality of orifice of a specific size forming straight jets 41 and forming a specific pattern.
  • the concave surface 42 may advantageously cover a larger part of the circumference in the case of the upper cylinder 1, than in the case of the lower cylinder 2.
  • the water cushion is formed in the space limited by the roll and the cooling head, but also, if necessary, by a transverse lower guide 7 ( Figure 2B ) and / or by transverse guides 5, 7 and lateral 8 ( Figures 2C and 2D ).
  • the lateral guides 8 can be mounted adjustably depending on the roll diameter.
  • the properties of the water cushion are also a function of the water flow. The heated water flows outward by gravity or pressure at the interstices between the cylinders and the guides, without additional evacuation device.
  • the shape of the cooling head as well as the distribution pattern of the jet jets are specific to the present development, in particular with regard to the taking into account of the variations of diameter, the automatic changes of working rolls, for the control roller profiles, maintenance requirements as well as offset and curvature of the work rolls.
  • the shape of the cooling head has been machined to have intensive cooling close to the right of way.
  • the distance between the surface of the head and the surface of the working roller thus decreases toward the end of the head closest to the right-of-way 9, where this distance is the smallest.
  • the radius of the concave part of the cooling head must be greater than the maximum possible radius of the working roller.
  • adaptable transverse plates 5, 7 and side plates 8 have been provided to control the flow of water but also to ensure the formation and stabilization of the water cushion ( Figures 2C and 2D ).
  • the pattern of distribution of the jet jets was selected to obtain an optimal homogeneity of the turbulence in the water cushion and also to control the thermal evolution and the cylinder crown, taking into account the distribution of differential water over the entire width of the working roller.
  • the figure 3 shows a comparison of the temperature decrease over time of the Cryotron probe, used to determine the transfer coefficient, between a conventional flat fan cooling system 21 (in gray) operating at 8 bar water pressure and an installation 22 (in black) according to the invention, with plates as described, working under a pressure of 2.4 bar (only at the lower cylinder). Different curves were plotted in each case corresponding to different measuring points on the circumference of the cylinder. The figure 3 shows that there is a much greater homogeneity of cooling in the case of the device of the invention.
  • the figure 5 shows the temperature differential between the lower and upper cylinders as a function of the width measurement position on the roller, counted from the motor side (squares: HTRC on lower cylinder, triangles: state of the art). The performances are very similar. If HTRC cooling is performed on both the upper and lower rolls, the roll temperature is at least 7 ° C lower than the performance achieved with the prior art systems (no represent).
  • the figure 6 shows the effect of cooling on the degradation of the surface of the working rolls (installation of the figure 4 ).
  • the four upper views correspond to a flat nozzle cooling of the upper roller according to the state of the art.
  • Bottom views # 1, 2 and 4 are cooling lower roll according to the present invention; the view No. 3 corresponds to a cooling of the lower roller according to the state of the art.
  • the figure 7 shows in detail the surface condition of the upper roll (conventional cooling, on the left) and the lower roll (cooling HTRC, on the right) respectively, after a typical rolling campaign.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Heat Treatment Of Articles (AREA)
  • Laminated Bodies (AREA)

Abstract

(EN) The present invention relates to a device for cooling a working roll (1, 2) belonging to a rolling stand used for rolling a long or flat product (3), characterized in that it comprises a cooling head in the form of a box section (6A, 6B) that is sealed except along a front face (42) lying a short distance from said roll (1, 2), and in which face a plurality of nozzles (41) has been machined or positioned in a determined pattern, said box section (6A, 6B) being concave and cylindrical at its front face (42). The box section (6A, 6B) is also fitted with transverse (5, 7) and lateral (8) plates which collaborate with the front face (42) of the box section so as to control the flow of cooling liquid and confine said liquid in the form of a highly turbulent flow. This then yields optimal cooling of the roll both in terms of the uniformity of the cooling across the surface thereof and in terms of the reduction in temperature as a result of the turbulent effect created.

Description

Objet de l'inventionObject of the invention

La présente invention se rapporte à un nouveau procédé de refroidissement des cylindres (ou rouleaux) de laminage, éventuellement à diamètre variable, basé sur un régime d'écoulement hautement turbulent (high turbulence cooling, HTC). Le procédé est appelé refroidissement de rouleaux de travail en régime hautement turbulent (high turbulence work roll cooling, HTRC).The present invention relates to a new method of cooling rolls (or rolls) rolling, optionally variable diameter, based on a highly turbulent flow regime (high turbulence , HTC). The process is called high turbulence work roll cooling ( HTRC).

L'invention se rapporte également au dispositif pour la mise en oeuvre du procédé.The invention also relates to the device for implementing the method.

Document JP-A 03142009 décrit une cage de laminage selon le preambule de la revendication 1.Document JP-A 03142009 discloses a rolling stand according to the preamble of claim 1.

Arrière-plan technologique et état de la techniqueTechnological background and state of the art

L'échauffement des cylindres de laminage à chaud est dû à la transmission de chaleur aux rouleaux par conduction à partir du produit, tel qu'une bande métallique, en cours de laminage. Ces dernières années, le refroidissement des cylindres de laminage a été étudié de manière intensive à cause de la très forte influence de celui-ci sur la dégradation desdits cylindres (usure) par suite de la fatigue thermomécanique engendrée et sur le contrôle du bombé des cylindres. La dégradation des cylindres a une très grande influence sur la qualité de produit.The heating of the hot rolling rolls is due to the heat transfer to the rolls by conduction from the product, such as a metal strip, during rolling. In recent years, the cooling of the rolling rolls has been studied intensively because of the very strong influence thereof on the degradation of said rolls (wear) as a result of the thermomechanical fatigue generated and on the control of the cylinder crown. . The degradation of the cylinders has a very great influence on the product quality.

Une installation typique de refroidissement de cylindres de travail d'une cage de laminage est décrite par exemple dans les documents JP-A-2001 340908 , JP-A-2001 001017 , JP-A-07 116714 , JP-A-05 104114 , JP-A-63 39712 , JP-A-61 176411 , etc. Des tubes ou modules ou bacs à eau de refroidissement sont équipés de pulvérisateurs et placés autour de chaque cylindre, avec des moyens d'alimentation en eau de refroidissement. En association avec le cylindre supérieur et le cylindre inférieur sont disposées des plaques de guidage de l'eau de refroidissement. Ces plaques sont munies d'un racloir, par exemple recouvert de caoutchouc, associé à chacun des cylindres pour empêcher l'eau de s'écouler sur le produit en cours de laminage.A typical installation for cooling working rolls of a rolling stand is described for example in the documents JP-A-2001 340908 , JP-A-2001 001017 , JP-A-07 116714 , JP-A-05 104114 , JP-A-63 39712 , JP-A-61 176411 etc. Tubes or modules or cooling water tanks are equipped with sprayers and placed around each cylinder, with means for supplying cooling water. In association with the upper cylinder and the lower cylinder are arranged cooling water guide plates. These plates are provided with a scraper, for example covered with rubber, associated with each of the cylinders to prevent water from flowing over the product being rolled.

Un problème important à résoudre dans le cas du refroidissement de cylindres de travail est l'obtention d'un refroidissement homogène sur la largeur et sur la circonférence. Des solutions existent où les flux fournis par les différents gicleurs d'un module de refroidissement sont régulés individuellement, en fonction de données fournies par un capteur tel qu'un thermomètre infrarouge (par exemple JP-A-12 24105 ). Une autre solution consiste à utiliser des têtes présentant des trous d'injection d'eau répartis selon un dessin approprié, dans la dimension axiale et dans la dimension circonférentielle ( JP-A-10 291011 ). Une troisième solution est d'utiliser une tête de gicleurs motorisés sur des guides latéraux ( EP-A-0 599 277 ).An important problem to be solved in the case of working roll cooling is to obtain a uniform cooling over the width and the circumference. Solutions exist where the flows provided by the different nozzles of a cooling module are regulated individually, according to data provided by a sensor such as an infrared thermometer (for example JP-A-12 24105 ). Another solution is to use heads having water injection holes distributed in a suitable pattern, in the axial dimension and in the circumferential dimension ( JP-A-10 291011 ). A third solution is to use a motorized sprinkler head on lateral guides ( EP-A-0 599 277 ).

Des auteurs récents reconnaissent d'une part qu'un impact des gicleurs se trouvant le plus près possible de l'emprise (rollgap) se traduit par une plus grande efficacité et d'autre part que le refroidissement intensif par gicleurs plats a une plus faible influence sur la température de rouleau que la surface couverte ( YE, X. et SAMAVASEKARA, I.V., The Role of Spray Cooling on Thermal Behaviour and Crown Development in Hot Strip Mill Work Rolls, Transactions of the ISS, July 1994, p.49 ). Une conséquence possible de l'application du refroidissement de rouleau à proximité du point de sortie du rouleau est une augmentation du gradient de tensions à la surface du rouleau et une aggravation du fissurage (« fire crazing »), mais avec une température sous la surface du rouleau plus faible ( SEKIMOTO et al, SEAISI Quarterly, April 1977, p.48 ).Recent authors recognize that an impact of the sprinklers as close as possible to the rollgap results in greater efficiency and that the intensive cooling by flat sprinklers has a lower influence on the roll temperature that the surface covered ( YE, X. and SAMAVASEKARA, IV, The Role of Spray Cooling on Thermal Behavior and Crown Development in the Hot Strip Mill Work Rolls, Transactions of the ISS, July 1994, p.49 ). A possible consequence of the application of cooling roller near the exit point of the roller is an increase in the tension gradient at the surface of the roll and an aggravation of cracking ("fire crazing"), but with a lower temperature under the surface of the roller ( SEKIMOTO et al, SEAISI Quarterly, April 1977, p.48 ).

Il est connu que le type d'injecteur (ou gicleur) utilisé dans le refroidissement de rouleaux a un effet significatif sur les valeurs HTC. VAN STEDEN et TELLMAN, dans A new method of designing work roll cooling system for improved productivity and strip quality, Fourth International hot Rolling Conference, Deauville, France, 1987 , ont comparé les performances de gicleurs à jet plat, carré ou ovale en mesurant la réponse thermique d'une plaque attachée à un cylindre après un échauffement à 400°C suivi d'un refroidissement par pulvérisation d'eau lorsque le cylindre est mis en rotation. On a obtenu des valeurs allant jusqu'à 140 kW/m2.K pour la gamme de gicleurs considérée. Ce travail a montré que la valeur HTC la plus haute, relative au pic de pulvérisation est atteinte par le gicleur de type à jet plat. Cependant, cette étude ignore manifestement le fait que les mêmes performances de refroidissement peuvent être obtenues par un gicleur ayant une valeur HTC de pic moindre, mais dont le jet est appliqué sur une beaucoup plus grande partie de la surface du rouleau. On constate donc des différences significatives dans la littérature en cè qui concerne à la fois la valeur HTC liée au gicleur et l'adéquation de différents types de gicleurs pour le refroidissement effectif de rouleaux.It is known that the type of injector (or nozzle) used in roll cooling has a significant effect on HTC values. VAN STEDEN and TELLMAN, in Fourth International Hot Rolling Conference, Deauville, France, 1987 , compared the performance of flat, square or oval jet nozzles by measuring the thermal response of a plate attached to a cylinder after heating to 400 ° C followed by cooling by water spray when the cylinder is put into operation. rotation. Values of up to 140 kW / m 2 .K were obtained for the range of sprinklers considered. This work has shown that the highest HTC value, relative to the spike peak is reached by the jet jet type nozzle. However, this study clearly ignores the fact that the same cooling performance can be achieved by a jet with a lower peak HTC value, but the jet is applied over a much larger surface of the roll. There are therefore significant differences in the literature with respect to both the value of HTC linked to the nozzle and the suitability of different types of nozzles for the effective cooling of rollers.

Il est certain que, dans le laminage de bandes plates, les systèmes de refroidissement basés sur des gicleurs à jet plat peuvent encore être améliorés. Cependant, ces améliorations sont limitées et les coûts sont très importants dès lors que l'on travaille aux hautes pressions et aux hautes vitesses de flux.It is certain that, in flat strip rolling, cooling systems based on flat jet nozzles can be further improved. However, these improvements are limited and the costs are very important when working at high pressures and high flow rates.

Dans les dernières années, différentes technologies de refroidissement alternatives ont été brevetées sur base de têtes situées à proximité de la surface du cylindre de travail et avec une circulation de flux (par exemple EP-A-919297 , JP-A-11 033610 ). On ne connaît cependant pas d'application industrielle de ces systèmes de refroidissement. Ainsi, on connaît également des dispositifs de refroidissement de rouleau dans lesquels une tête de refroidissement est conformée pour assurer un guidage de l'eau à la surface du rouleau. La surface de la tête est séparée de celle du rouleau par un intervalle dans lequel circule l'eau de refroidissement, créant une sorte de « chemisage » ( JP-A-61 266110 , JP-A-63 303609 , JP-A-20 84205 ). L'eau peut soit être amenée par une extrémité de la tête et évacuée par l'autre extrémité ( JP-A-20 84205 ), soit être acheminée par les deux extrémités et être évacuée par le centre ( EP-A-919 297 ), l'évacuation étant réalisée au travers de la tête elle-même, des systèmes de racloirs empêchant la fuite le long de la circonférence des rouleaux. L'évacuation vers l'extérieur peut encore être effectuée entre une extrémité de la tête et la surface du rouleau ( JP-A-11 277113 ). Dans le document JP-A-58 047502 , on décrit en outre un sabot de refroidissement déformable au moyen de ressorts pour pouvoir s'adapter à la surface du rouleau.In recent years, various alternative cooling technologies have been patented based on heads located near the surface of the working cylinder and with flow circulation (for example EP-A-919297 , JP-A-11 033610 ). However, no industrial application of these cooling systems is known. Thus, roller cooling devices are also known in which a cooling head is shaped to provide water guidance on the surface of the roll. The surface of the head is separated from the surface of the roll by an interval in which the cooling water circulates, creating a kind of "lining" ( JP-A-61 266110 , JP-A-63 303609 , JP-A-20 84205 ). The water can either be brought from one end of the head and evacuated from the other end ( JP-A-20 84205 ), be conveyed by both ends and be evacuated by the center ( EP-A-919,297 ), the evacuation being carried out through the head itself, scraper systems preventing leakage along the circumference of the rollers. Evacuation to the outside can still be done between one end of the head and the surface of the roll ( JP-A-11 277113 ). In the document JP-A-58 047502 in addition, a deformable cooling shoe is described by means of springs in order to be able to adapt to the surface of the roll.

Dans ces systèmes, il n'y a pas de pulvérisateurs d'alimentation en eau répartis sur toute la surface de la tête de refroidissement, mais en général un seul pulvérisateur.In these systems, there are no water supply sprays spread over the entire surface of the cooling head, but usually only one sprayer.

La Demanderesse a commencé à examiner les technologies alternatives de refroidissement en 1993. Des essais ont été réalisés avec une tête de refroidissement en régime hautement turbulent et à basse pression (High Turbulence Low Pressure, HTLP) et avec une tête de refroidissement à coussin d'eau (Water Pillow Cooling, WPC), située au-delà du racloir. Ces deux technologies permettent de créer une forte turbulence à la surface du rouleau. De cette manière, un motif de refroidissement très homogène est obtenu. Des simulations préalables de refroidissement hautement turbulent ont montré le potentiel de cette technologie pour le refroidissement des cylindres de travail. Le refroidissement hautement turbulent réduit la fatigue thermique et par suite la dégradation de la surface du cylindre de travail. De plus, pour le même flux de chaleur dissipé pendant le refroidissement, cette technologie requiert une vitesse de flux et une pression moindres en comparaison avec les configurations traditionnelles de refroidissement par vaporisation à jet plat.The Applicant has begun to examine alternative cooling technologies in 1993. Tests have been carried out with a cooling head in High Turbulence Low Pressure ( HTLP) and with a Water Pillow Cooling ( WPC), located beyond the scraper. Both technologies can create a strong turbulence on the surface of the roll. In this way, a very homogeneous cooling pattern is obtained. Preliminary simulations of highly turbulent cooling have shown the potential of this technology for cooling work rolls. Highly turbulent cooling reduces thermal fatigue and thus the degradation of the work roll surface. In addition, for the same flow of heat dissipated during cooling, this technology requires less flow velocity and pressure compared to conventional flat fan spray cooling configurations.

Buts de l'inventionGoals of the invention

La présente invention vise à fournir une solution permettant de s'affranchir des inconvénients de l'état de la technique.The present invention aims to provide a solution to overcome the disadvantages of the state of the art.

En particulier, cette invention a pour but de fournir un refroidissement efficace des cylindres de laminage tout en garantissant une réduction de la fatigue thermomécanique et par suite une dégradation moindre de la surface des cylindres.In particular, this invention aims to provide efficient cooling of the rolling rolls while ensuring a reduction in thermomechanical fatigue and therefore less degradation of the roll surface.

L'invention a encore pour but de demander, à échange thermique équivalent, une vitesse de flux et une pression d'eau moindres que les systèmes de refroidissement de l'état de la technique, en particulier ceux à jet plat.Another object of the invention is to require, with equivalent heat exchange, a flow rate and a lower water pressure than the cooling systems of the state of the art, in particular those with flat jet.

La présente invention a encore pour but de concevoir un dispositif de refroidissement capable de s'adapter facilement à des cylindres de diamètre variable.Another object of the present invention is to design a cooling device capable of easily adapting to cylinders of variable diameter.

Principaux éléments caractéristiques de l'inventionMain characteristic elements of the invention

Un premier objet de la présente invention se rapporte à un dispositif de refroidissement d'un cylindre de travail appartenant à une cage de laminage d'un produit long ou plat, caractérisé en ce qu'il comprend une tête de refroidissement se présentant sous la forme d'un caisson essentiellement étanche en soi, excepté sur une face avant se trouvant à courte distance dudit cylindre et dans laquelle une pluralité de gicleurs a été usinée ou positionnée selon un dessin à deux dimensions, ledit caisson, muni de moyens d'alimentation en liquide de refroidissement, étant concave et cylindrique au niveau de sa face avant avec un rayon tel que, lorsque le dispositif est en position de travail, la distance selon la direction radiale entre ladite face avant et la surface du cylindre va en croissant en partant de l'extrémité du caisson le plus proche de l'emprise et en s'éloignant du produit en cours de laminage.A first object of the present invention relates to a cooling device of a working cylinder belonging to a roll stand of a long or flat product, characterized in that it comprises a cooling head in the form of a substantially watertight box in itself, except on a front face being a short distance from said cylinder and in which a plurality of nozzles has been machined or positioned according to a two-dimensional drawing, said box, provided with means for supplying coolant, being concave and cylindrical at its front face with a radius such that, when the device is in the working position, the distance in the radial direction between said front face and the surface of the cylinder is increasing starting from the end of the caisson closest to the right-of-way and away from the product being rolled.

Selon l'invention, la tête de refroidissement est équipée d'une plaque inférieure transverse disposée longitudinalement par rapport au cylindre et située à une distance du cylindre telle que ladite plaque inférieure coopère avec la face avant du caisson, de manière à assurer le contrôle du flux de liquide de refroidissement et le confinement de celui-ci sous forme d'un coussin d'eau hautement turbulent. La présence de cette plaque inférieure transverse est obligatoire dans le cas de cylindres de faible diamètre.According to the invention, the cooling head is equipped with a transverse bottom plate arranged longitudinally with respect to the cylinder and located at a distance from the cylinder such that said bottom plate cooperates with the front face of the box, so as to ensure control of the flow of coolant and containment of it in the form of a highly turbulent water cushion. The presence of this transverse bottom plate is mandatory in the case of small diameter cylinders.

Avantageusement, la tête de refroidissement est munie en outre de plaques latérales réglables disposées du côté des extrémités transversales du cylindre et situées à une distance du cylindre telle que lesdites plaques latérales coopèrent avec la face avant du caisson et avec la plaque inférieure transverse, de manière à assurer le contrôle du flux de liquide de refroidissement et le confinement de celui-ci sous forme d'un coussin d'eau hautement turbulent.Advantageously, the cooling head is further provided with adjustable side plates disposed on the side of the transverse ends of the cylinder and located at a distance from the cylinder such that said side plates cooperate with the front face of the box and with the transverse bottom plate, so as to to ensure the control of the coolant flow and confinement thereof in the form of a highly turbulent water cushion.

Avantageusement, la courbure des plaques latérales correspond à la courbure maximale des cylindres utilisés sur l'installation.Advantageously, the curvature of the side plates corresponds to the maximum curvature of the cylinders used on the installation.

Selon une forme d'exécution préférée, la face avant comprend une plaque ou une tôle dans laquelle sont positionnés ou usinés les gicleurs, dont les orifices sont constitués de petits trous de section axiale droite.According to a preferred embodiment, the front face comprises a plate or a sheet in which the sprinklers are positioned or machined, the orifices of which consist of small holes of right axial section.

De préférence encore, les orifices des gicleurs sont de section transverse ronde, carrée ou ovale.More preferably, the orifices of the nozzles are of round cross section, square or oval.

Avantageusement, le rayon de la surface concave cylindrique de la face avant a une valeur supérieure à une valeur maximale de rayon de cylindre prédéterminée, qui limite la gamme de taille de cylindres utilisable.Advantageously, the radius of the cylindrical concave surface of the front face has a value greater than a predetermined maximum cylinder radius value, which limits the usable roll size range.

Toujours selon l'invention, le dessin d'usinage des gicleurs est choisi pour rendre le refroidissement du cylindre le plus homogène possible sur toute la surface du cylindre et en particulier sur la largeur du cylindre.Still according to the invention, the machining pattern of the nozzles is chosen to make the cooling of the cylinder as homogeneous as possible over the entire surface of the cylinder and in particular over the width of the cylinder.

Avantageusement, le dessin d'usinage des gicleurs est défini par le nombre, la position et le diamètre ou la taille des orifices dans la plaque de ladite face avant.Advantageously, the machining pattern of the nozzles is defined by the number, the position and the diameter or the size of the orifices in the plate of said front face.

Selon une autre forme d'exécution préférée, les orifices sont usinés selon un réseau déterminé et le dessin précité est obtenu en obturant certains orifices.According to another preferred embodiment, the orifices are machined according to a given network and the aforementioned drawing is obtained by closing certain orifices.

Avantageusement, le liquide de refroidissement comprend de l'eau.Advantageously, the coolant comprises water.

Un autre objet de la présente invention concerne un procédé de refroidissement d'un cylindre de travail appartenant à une cage de laminage d'un produit long ou d'un produit plat, en particulier d'une bande métallique, mettant en oeuvre le dispositif précité, caractérisé par le fait que :

  • l'on dispose la tête de refroidissement à proximité de la surface du cylindre pour créer un espace compris entre 5 et 200 mm entre la face avant du caisson et ladite surface du cylindre, ledit espace allant en croissant en partant de l'emprise et en s'éloignant du produit en cours de laminage ;
  • on alimente la tête de refroidissement en liquide de refroidissement, de préférence de l'eau, et on injecte cette eau dans ledit espace au travers de gicleurs présentant un orifice de diamètre compris entre 1 et 6 mm ;
  • on règle la pression de liquide de refroidissement à une valeur comprise entre 1 et 6 bar et le débit spécifique entre 100 et 500 m3/heure/m2, pour créer dans l'espace précité un coussin de liquide en régime hautement turbulent.
Another subject of the present invention relates to a method of cooling a working cylinder belonging to a rolling stand of a product or a flat product, in particular a metal strip, implementing the aforementioned device, characterized by the fact that:
  • the cooling head is arranged near the surface of the cylinder to create a space between 5 and 200 mm between the front face of the box and said surface of the cylinder, said space increasing from the right-of-way and away from the product being rolled;
  • the cooling head is supplied with cooling liquid, preferably water, and this water is injected into said space through nozzles having an orifice having a diameter of between 1 and 6 mm;
  • the coolant pressure is adjusted to a value between 1 and 6 bar and the specific flow rate between 100 and 500 m 3 / hour / m 2 , to create in the aforementioned space a liquid cushion in a highly turbulent regime.

De préférence, la pression de liquide de refroidissement dans le caisson est inférieure à 4 bar.Preferably, the coolant pressure in the box is less than 4 bar.

De préférence encore, la pression de liquide de refroidissement est comprise entre 2 et 4 bar.More preferably, the coolant pressure is between 2 and 4 bar.

Toujours selon le procédé de l'invention, on règle la distance entre la plaque inférieure transverse et le cylindre de manière à obtenir dans l'interstice un débit de liquide spécifique compris entre 2 et 10 m/s, et de préférence supérieur à 3 m/s.Still according to the method of the invention, the distance between the lower transverse plate and the cylinder is adjusted so as to obtain a specific liquid flow rate in the gap between 2 and 10 m / s, and preferably greater than 3 m. / s.

De préférence, les plaques latérales sont réglées pour avoir une ouverture minimale comprise entre 0 et 10 mm.Preferably, the side plates are set to have a minimum opening of between 0 and 10 mm.

Brève description des figuresBrief description of the figures

Les figures 1A et 1B représentent schématiquement deux formes d'exécution montrant le principe d'une tête de refroidissement de cylindres de travail sur une ligne de laminage à chaud selon l'état de la technique (gicleurs plats).FIGS. 1A and 1B diagrammatically show two embodiments showing the principle of a working cylinder cooling head on a hot rolling line according to the state of the art (flat nozzles).

Les figures 2A à 2D représentent schématiquement plusieurs formes d'exécution montrant le principe d'une telle tête de refroidissement dans le cas de la présente invention (refroidissement hautement turbulent).The Figures 2A to 2D schematically show several embodiments showing the principle of such a cooling head in the case of the present invention (highly turbulent cooling).

La figure 3 représente graphiquement l'évolution de la température au cours du temps, en différentes positions du cylindre de travail respectivement dans une installation conventionnelle à 8 bar de pression et dans le cas d'une installation HTRC selon la présente invention, à 2,4 bars de pression et avec des plaques de guidage de l'eau.The figure 3 graphically represents the evolution of the temperature over time, in different positions of the working cylinder respectively in a conventional installation at 8 bar of pressure and in the case of an HTRC installation according to the present invention, at 2.4 bars of pressure and with water guide plates.

La figure 4 montre une implantation industrielle d'une tête de refroidissement HTRC.The figure 4 shows an industrial layout of an HTRC cooling head.

La figure 5 montre graphiquement les performances de refroidissement de l'installation selon l'invention à basse pression (uniquement au niveau du cylindre inférieur) par comparaison avec le refroidissement à jet plat à haute pression, selon l'état de la technique.The figure 5 shows graphically the cooling performance of the installation according to the invention at low pressure (only at the lower cylinder) compared to the high-pressure flat jet cooling, according to the state of the art.

La figure 6 montre la dégradation de la surface des cylindres supérieur et inférieur respectivement dans le cas de 3 configurations HTRC et une configuration selon l'état de la technique.The figure 6 shows the degradation of the surface of the upper and lower cylinders respectively in the case of 3 HTRC configurations and a configuration according to the state of the art.

La figure 7 montre l'état de surface d'un cylindre après une campagne de laminage en utilisant respectivement un refroidissement selon l'état de la technique (à gauche) et un refroidissement HTRC selon la présente invention (à droite).The figure 7 shows the surface state of a cylinder after a rolling campaign using respectively cooling according to the state of the art (left) and cooling HTRC according to the present invention (right).

Description d'une forme d'exécution selon l'état de la techniqueDescription of an embodiment according to the state of the art

Les figures 1A et 1B montrent schématiquement une installation de refroidissement de rouleaux de travail dans un laminoir, selon l'état de la technique, avec, dans cet exemple soit des gicleurs montés sur des tubes indépendants (figure 1A), soit des gicleurs agencé sur un module (figure 1B). La paire de rouleaux comporte un rouleau supérieur 1 et un rouleau inférieur 2 tournant en sens contraire pour faire avancer la bande d'acier 3. Au niveau du rouleau supérieur se trouve un dispositif de refroidissement 4A, avec ses accessoires de réglage, munis de gicleurs plats 40 faisant face au rouleau supérieur 1. Au niveau du rouleau inférieur se trouve un dispositif de refroidissement 4B, avec ses accessoires de réglage, munis de gicleurs plats 40 faisant face au rouleau inférieur 2.FIGS. 1A and 1B schematically show a cooling installation of working rolls in a rolling mill, according to the state of the art, with, in this example either nozzles mounted on independent tubes (FIG. 1A), or nozzles arranged on a module (Figure 1B). The pair of rollers has an upper roll 1 and a lower roll 2 rotating in opposite directions to advance the steel strip 3. At the upper roll is a cooling device 4A, with its adjustment accessories, provided with nozzles Plates 40 facing the upper roller 1. At the bottom roller is a cooling device 4B, with its adjustment accessories, provided with flat nozzles 40 facing the lower roller 2.

Dans le dispositif de la figure 1A, les gicleurs sont placés sur 4 tubes tandis que dans le dispositif de la figure 1B, les gicleurs sont agencés dans un module 4A, 4B.In the device of FIG. 1A, the nozzles are placed on 4 tubes whereas in the device of FIG. 1B, the nozzles are arranged in a module 4A, 4B.

En général, la distance entre les gicleurs et le cylindre est de 150-500 mm, ce qui ne permet pas d'utiliser des cylindres de différents diamètres avec un seul dispositif de refroidissement.In general, the distance between the nozzles and the cylinder is 150-500 mm, which does not allow to use cylinders of different diameters with a single cooling device.

Description de plusieurs formes d'exécution préférées de l'inventionDescription of several preferred embodiments of the invention

Selon l'invention, représentée sur les figures 2A à 2D, la tête de refroidissement est conçue pour mettre en oeuvre la technologie WPC, c'est-à-dire en vue de créer un coussin d'eau hautement turbulent entre la tête de refroidissement et la surface du rouleau de travail. La turbulence est provoquée par injection d'eau à basse pression dans le coussin d'eau à travers des gicleurs à jet droit développés par la Demanderesse.According to the invention, represented on the Figures 2A to 2D , the cooling head is designed to implement the WPC technology, that is, to create a highly turbulent water cushion between the cooling head and the working roll surface. Turbulence is caused by low water injection pressure in the water cushion through jet sprinklers developed by the Applicant.

Selon les figures 2A à 2D, l'installation de refroidissement selon l'invention se compose d'un caisson supérieur 6A faisant face au rouleau supérieur 1 et d'un caisson inférieur 6B faisant face au rouleau inférieur 2. Chaque caisson 6A, 6B comprend une surface concave 42 en vis-à-vis du rouleau correspondant 1, 2. Cette surface concave 42 est constituée d'une paroi munie d'une pluralité d'orifice de taille déterminée formant des gicleurs droits 41 et formant un dessin déterminé. La surface concave 42 peut couvrir avantageusement une plus grande partie de circonférence dans le cas du cylindre supérieur 1, que dans le cas du cylindre inférieur 2.According to Figures 2A to 2D , the cooling installation according to the invention consists of an upper box 6A facing the upper roller 1 and a lower box 6B facing the lower roller 2. Each box 6A, 6B comprises a concave surface 42 screwed to the corresponding roller 1, 2. This concave surface 42 consists of a wall provided with a plurality of orifice of a specific size forming straight jets 41 and forming a specific pattern. The concave surface 42 may advantageously cover a larger part of the circumference in the case of the upper cylinder 1, than in the case of the lower cylinder 2.

Le coussin d'eau est formé dans l'espace limité par le rouleau et la tête de refroidissement, mais également, le cas échéant, par un guide inférieur transversal 7 (figure 2B) et/ou par des guides transversaux 5, 7 et latéraux 8 (figures 2C et 2D). Eventuellement, les guides latéraux 8 peuvent être montés de manière ajustable en fonction du diamètre de rouleau. Les propriétés du coussin d'eau sont également fonction du débit d'eau. L'eau réchauffée s'écoule vers l'extérieur par gravité ou sous l'effet de la pression au niveau des interstices entre les cylindres et les guides, sans dispositif d'évacuation supplémentaire.The water cushion is formed in the space limited by the roll and the cooling head, but also, if necessary, by a transverse lower guide 7 ( Figure 2B ) and / or by transverse guides 5, 7 and lateral 8 ( Figures 2C and 2D ). Optionally, the lateral guides 8 can be mounted adjustably depending on the roll diameter. The properties of the water cushion are also a function of the water flow. The heated water flows outward by gravity or pressure at the interstices between the cylinders and the guides, without additional evacuation device.

La forme de la tête de refroidissement ainsi que le dessin de distribution des gicleurs à jet droit sont spécifiques au présent développement, en particulier pour ce qui concerne la prise en compte des variations de diamètre, des changements automatiques de rouleaux de travail, pour le contrôle des profils de rouleaux, les exigences de maintenance ainsi que le décalage et la courbure des rouleaux de travail.The shape of the cooling head as well as the distribution pattern of the jet jets are specific to the present development, in particular with regard to the taking into account of the variations of diameter, the automatic changes of working rolls, for the control roller profiles, maintenance requirements as well as offset and curvature of the work rolls.

Selon l'invention, la forme de la tête de refroidissement a été usinée pour avoir un refroidissement intensif proche de l'emprise. La distance entre la surface de la tête et la surface du rouleau de travail va ainsi en diminuant en direction de l'extrémité de la tête la plus proche de l'emprise 9, où cette distance est la plus faible. En vue de prendre en compte les variations de diamètre, le rayon de la partie concave de la tête de refroidissement doit être plus grand que le rayon maximal possible du rouleau de travail. De plus, comme déjà mentionné, des plaques transversales 5, 7 et latérales 8 adaptables ont été prévues pour contrôler le flux d'eau mais aussi pour assurer la formation et la stabilisation du coussin d'eau (figures 2C et 2D).According to the invention, the shape of the cooling head has been machined to have intensive cooling close to the right of way. The distance between the surface of the head and the surface of the working roller thus decreases toward the end of the head closest to the right-of-way 9, where this distance is the smallest. In order to take into account variations in diameter, the radius of the concave part of the cooling head must be greater than the maximum possible radius of the working roller. In addition, as already mentioned, adaptable transverse plates 5, 7 and side plates 8 have been provided to control the flow of water but also to ensure the formation and stabilization of the water cushion ( Figures 2C and 2D ).

Le dessin de distribution des gicleurs à jet droit a été sélectionné pour obtenir une homogénéité optimale de la turbulence dans le coussin d'eau et aussi pour contrôler l'évolution thermique et le bombé de cylindre, en prenant en compte la distribution d'eau différentielle sur toute la largeur du rouleau de travail.The pattern of distribution of the jet jets was selected to obtain an optimal homogeneity of the turbulence in the water cushion and also to control the thermal evolution and the cylinder crown, taking into account the distribution of differential water over the entire width of the working roller.

La figure 3 montre une comparaison de la diminution de température au cours du temps de la sonde Cryotron, utilisée pour déterminer le coefficient de transfert, entre une installation conventionnelle 21 (en gris) de refroidissement à gicleurs plats travaillant sous une pression d'eau de 8 bar et une installation 22 (en noir) selon l'invention, avec plaques telles que décrites, travaillant sous une pression de 2,4 bar (uniquement au niveau du cylindre inférieur). On a tracé différentes courbes dans chaque cas correspondant à différents points de mesure sur la circonférence du cylindre. La figure 3 montre qu'il y a une homogénéité de refroidissement beaucoup plus grande dans le cas du dispositif de l'invention.The figure 3 shows a comparison of the temperature decrease over time of the Cryotron probe, used to determine the transfer coefficient, between a conventional flat fan cooling system 21 (in gray) operating at 8 bar water pressure and an installation 22 (in black) according to the invention, with plates as described, working under a pressure of 2.4 bar (only at the lower cylinder). Different curves were plotted in each case corresponding to different measuring points on the circumference of the cylinder. The figure 3 shows that there is a much greater homogeneity of cooling in the case of the device of the invention.

Un essai industriel a été réalisé avec succès au laminoir à chaud avec un prototype de tête HTRC (voir figure 4, module HTRC sur cylindre inférieur et module de refroidissement conventionnel sur cylindre supérieur). Les principaux avantages du nouveau système sont une consommation faible en énergie, l'homogénéité de la distribution de l'eau de refroidissement, une plus grande performance de refroidissement et une dispersion moindre dans la température mesurée à la surface du cylindre.An industrial trial was successfully carried out at the hot rolling mill with a prototype HTRC head (see figure 4 , HTRC module on lower cylinder and conventional cooling module on upper cylinder). The main advantages of the new system are low energy consumption, homogeneous cooling water distribution, higher cooling performance and less dispersion in the temperature measured at the cylinder surface.

La figure 5 montre le différentiel de température entre les cylindres inférieur et supérieur en fonction de la position de mesure en largeur sur le rouleau, comptée à partir du côté du moteur (carrés : HTRC sur cylindre inférieur ; triangles : état de la technique). Les performances sont très similaires. Si on effectue un refroidissement HTRC à la fois au niveau du cylindre supérieur et du cylindre inférieur, la température de cylindre est inférieure d'au moins 7°C par rapport à la performance obtenue avec les systèmes de l'état de la technique (non représenté).The figure 5 shows the temperature differential between the lower and upper cylinders as a function of the width measurement position on the roller, counted from the motor side (squares: HTRC on lower cylinder, triangles: state of the art). The performances are very similar. If HTRC cooling is performed on both the upper and lower rolls, the roll temperature is at least 7 ° C lower than the performance achieved with the prior art systems (no represent).

En comparaison avec les systèmes de refroidissement de l'état de la technique, une pression de flux d'eau plus faible et avantageusement comprise entre 2 et 4 bars est suffisante. Cela permet de substantielles économies sur une période d'une année par exemple.In comparison with the cooling systems of the state of the art, a lower water flow pressure and advantageously between 2 and 4 bars is sufficient. This allows substantial savings over a period of a year for example.

Dès les premiers essais, une tendance à une usure moindre des rouleaux de travail a été constatée en utilisant l'installation selon la présente invention. La figure 6 montre l'effet du refroidissement sur la dégradation de la surface des rouleaux de travail (installation de la figure 4). Les quatre vues supérieures correspondent à un refroidissement à gicleurs plats du rouleau supérieur selon l'état de la technique. Les vues inférieures n° 1, 2 et 4 correspondent à un refroidissement du rouleau inférieur selon la présente invention ; la vue n° 3 correspond à un refroidissement du rouleau inférieur selon l'état de la technique. La figure 7 montre en détail l'état de surface respectivement du rouleau supérieur (refroidissement classique, à gauche) et du rouleau inférieur (refroidissement HTRC, à droite), après une campagne de laminage typique.From the first tests, a tendency to less wear of the working rolls was found using the installation according to the present invention. The figure 6 shows the effect of cooling on the degradation of the surface of the working rolls (installation of the figure 4 ). The four upper views correspond to a flat nozzle cooling of the upper roller according to the state of the art. Bottom views # 1, 2 and 4 are cooling lower roll according to the present invention; the view No. 3 corresponds to a cooling of the lower roller according to the state of the art. The figure 7 shows in detail the surface condition of the upper roll (conventional cooling, on the left) and the lower roll (cooling HTRC, on the right) respectively, after a typical rolling campaign.

Récemment, un nouveau projet a été mis en route pour déterminer l'aptitude du refroidissement HTC au cas du laminage de produits longs.Recently, a new project was started to determine the suitability of HTC cooling for rolling long products.

Claims (16)

  1. Rolling stand for rolling a long or flat product, comprising a working roll (1,2) and a device for cooling said working roll (1,2), the rolling stand comprising a cooling head in the form of a box (6A, 6B) that is essentially watertight as such, except on a front face (42) located at a short distance from said roll (1,2) and in which a plurality of nozzles (41) has been machined or positioned in a bidimensional pattern, said box (6A, 6B) provided with a means for supplying cooling liquid, characterized in that said box (6A, 6B) is concave and cylindrical at the level of its front face (42), with a radius such that, when the device is in the working position, the distance in the radial direction between said front face (42) and the surface of the roll (1,2) increases starting from the end of the box (6A, 6B) closest to the roll nip (9) and moving away from the product being rolled.
  2. Rolling stand according to Claim 1, characterized in that the cooling head (6A, 6B) is provided with a transverse lower plate (5,7) arranged longitudinally relative to the roll (1,2) and located at a distance from the roll (1,2) such that said lower plate (5,7) cooperates with the front face (42) of the box, in order to ensure the control of the cooling liquid flow and its confinement in the form of a highly turbulent water cushion.
  3. Rolling stand according to Claim 2, characterized in that the cooling head (6A, 6B) is further provided with adjustable side plates (8) arranged at the side of the transverse ends of the roll (1,2) and located at a distance from the roll (1,2) such that said side plates (8) cooperate with the front face (42) of the box and with the transverse lower plate (5,7), in order to ensure the control of the cooling liquid flow and its confinement in the form of a highly turbulent water cushion.
  4. Rolling stand according to Claim 3, characterized in that the curvature of the side plates (8) corresponds to the maximum curvature of the rolls (1,2) used on the equipment.
  5. Rolling stand according to any one of the preceding claims, characterized in that the front face (42) comprises a plate or a sheet in which the nozzles (41) are positioned or machined, the orifices of which are made of small holes with a straight axiale section.
  6. Rolling stand according to Claim 5, characterized in that the orifices of the nozzles (41) have a round, square, or oval cross-section.
  7. Rolling stand according to any one of the preceding claims, characterized in that the radius of the cylindrical concave surface of the front face (42) has a value greater than a predetermined maximum value for the radius of the roll (1,2), which limits the range of usable roll sizes.
  8. Rolling stand according to any one of the preceding claims, characterized in that the machining pattern of the nozzles (41) is chosen so that the cooling of the roll is as homogeneous as possible over the entire surface of the roll (1,2), and in particular over the width of the roll.
  9. Rolling stand according to any one of Claims 5 to 8, characterized in that the machining pattern of the nozzles (41) is defined by the number, position, and diameter or size of the orifices in the plate of said front face (42).
  10. Rolling stand according to Claim 9, characterized in that the orifices are machined according to a determined grid, and in that the above-mentioned pattern is obtained by closing off some of the orifices.
  11. Rolling stand according to any one of the preceding claims, characterized in that the cooling liquid comprises water.
  12. Method for cooling a working roll belonging to a rolling stand for a long product or a flat product, in particular of a metal strip (3), implementing the device according to any one of the preceding claims, characterized by the steps of:
    - arranging the cooling head near the surface of the roll so as to create a gap comprised between 5 and 200 mm between the front face (42) of the box (6A, 6B), and said surface of the roll (1,2), said gap increasing starting with the roll nip (9) and moving away from the product being rolled;
    - supplying the cooling head with cooling liquid, preferably water, and injecting this water into said gap through nozzles (41) having an orifice with a diameter comprised between 1 and 6 mm;
    - setting the cooling liquid pressure to a value comprised between 1 and 6 bar and the specific flow between 100 and 500 m3/hour/m2, so as to create in the above-mentioned gap a liquid cushion in a highly turbulent state.
  13. Method according to Claims 12, characterized in that the cooling liquid pressure inside the box (6A, 6B] is less than 4 bar.
  14. Method according to Claim 13, characterized in that the cooling liquid pressure is comprised between 2 and 4 bar.
  15. Method according to Claim 12, characterized by the step of setting the distance between the transverse lower plate (5,7) and the roll (1,2) so as to obtain inside the gap a specific liquid flow comprised between 2 and 10 m/s, and preferably greater than 3 m/s.
  16. Method according to Claim 12, characterized in that the side plates are set to have a minimum opening comprised between 0 and 10 mm.
EP07855376.5A 2007-02-09 2007-12-21 Device and method for cooling rolls used for rolling in a highly turbulent environment Active EP2114584B8 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07855376T PL2114584T3 (en) 2007-02-09 2007-12-20 Device and method for cooling rolls used for rolling in a highly turbulent environment

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2007/0055A BE1017462A3 (en) 2007-02-09 2007-02-09 DEVICE AND METHOD FOR COOLING ROLLING CYLINDERS IN HIGHLY TURBULENT.
PCT/BE2007/000129 WO2008104037A1 (en) 2007-02-09 2007-12-21 Device and method for cooling rolls used for rolling in a highly turbulent environment

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EP2114584A1 EP2114584A1 (en) 2009-11-11
EP2114584B1 true EP2114584B1 (en) 2011-09-14
EP2114584B8 EP2114584B8 (en) 2013-04-24

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EP (1) EP2114584B8 (en)
JP (1) JP5351050B2 (en)
KR (1) KR101452835B1 (en)
CN (1) CN101600519B (en)
AT (1) ATE524249T1 (en)
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EP3967789A1 (en) 2020-09-11 2022-03-16 Centre de Recherches Métallurgiques ASBL - Centrum voor Research in de Metallurgie VZW Ultrafast pickling method and installation therefor
WO2023242708A1 (en) 2022-06-13 2023-12-21 Arcelormittal Device and method for cooling rolls used for rolling in a highly turbulent environment

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Publication number Priority date Publication date Assignee Title
WO2020126333A1 (en) 2018-12-19 2020-06-25 Tata Steel Ijmuiden B.V. Cooling device for a hot-rolling mill
EP3967789A1 (en) 2020-09-11 2022-03-16 Centre de Recherches Métallurgiques ASBL - Centrum voor Research in de Metallurgie VZW Ultrafast pickling method and installation therefor
WO2022053515A1 (en) 2020-09-11 2022-03-17 Centre De Recherche Metallurgiques Asbl -Centrum Voor Research In De Metallurgie Vzw Ultrafast pickling method and installation therefor
WO2023242708A1 (en) 2022-06-13 2023-12-21 Arcelormittal Device and method for cooling rolls used for rolling in a highly turbulent environment
WO2023242613A1 (en) 2022-06-13 2023-12-21 Arcelormittal Device and method for cooling rolls used for rolling in a highly turbulent environment

Also Published As

Publication number Publication date
PL2114584T3 (en) 2012-02-29
KR101452835B1 (en) 2014-10-21
BRPI0720818A2 (en) 2014-03-04
US20100089112A1 (en) 2010-04-15
BE1017462A3 (en) 2008-10-07
BRPI0720818B1 (en) 2019-08-13
ATE524249T1 (en) 2011-09-15
CN101600519A (en) 2009-12-09
JP2010517782A (en) 2010-05-27
EP2114584B8 (en) 2013-04-24
US8281632B2 (en) 2012-10-09
EP2114584A1 (en) 2009-11-11
KR20090108076A (en) 2009-10-14
CN101600519B (en) 2013-01-02
JP5351050B2 (en) 2013-11-27
ES2372631T3 (en) 2012-01-24
WO2008104037A1 (en) 2008-09-04

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