EP2391459B1 - Spraying method and device for a rolling plant - Google Patents

Description

The present invention relates to a method and a device for watering a rolling strip rolling installation, according to the preambles of claims 1 and 9.

In particular, the invention relates to the lubrication, as well as the cooling of the metal strip and elements related to the cold rolling of said web in continuous or reversible running in at least one rolling stand. In particular, said elements refer to a set of superimposed cylinders having parallel longitudinal axes and placed substantially in at least one plane perpendicular to the running direction of the strip. The longitudinal axis of one of said cylinders is defined as an instantaneous axis of rotation, parallel to a generatrix of the cylinder and passing through the center of mass of said cylinder.

A metal strip rolling plant generally comprises at least one rolling stand equipped with at least two vertically superimposed working rolls, each having their longitudinal axis of rotation parallel to the plane defined by the metal strip and placed in the same clamping plane. substantially perpendicular to the running direction of the strip. During rolling, the working rolls are generally pressed against each other by a pair of support rollers having their longitudinal axis in said same clamping plane, and between which is applied a pressure - or a force - of rolling . Such a rolling plant formed of four vertically stacked cylinders, two small work rolls diameter associated with two larger diameter support cylinders, is called "quarto". If two other intermediate cylinders are respectively interposed between the working roll and the support roll, the rolling installation is then formed of six vertically superposed rolls, ie a pair of working rolls, then a first pair of intermediate support rolls. and a second pair of final support rolls, and is usually referred to as "sexto" or "6-High". Finally, a sexto-type mill may have lateral supports, ie each side of each of the work rolls is in contact with a lateral support cylinder itself supported by two rows of lateral support rollers mounted side by side. The sexto rolling mills comprising said rolls and support rollers are generally referred to as laterally supported sexto-type rolling mills. In all cases, the cylinders bear against each other along substantially parallel bearing lines and directed along a generatrix whose profile, normally rectilinear, depends on the forces applied and the strength of the cylinders. It will be for the superimposed cylinders in a plane perpendicular to the running direction of the strip of forces normal to the strip, and for the lateral support rolls, side forces parallel / tangential to the strip and applied on the working rolls by a tangential force for transmitting a rolling torque from the intermediate support rolls.

In order to facilitate the movement of the strip between the working rolls, the gap of the cold rolling mills is lubricated. For this purpose, a lubrication fluid is sprayed on the strip to be rolled and on the surface of the working rolls. In certain cases, the watering fluid also plays an important role in the evacuation of the calories produced in the air gap by the strong reduction of the band and its plastic deformation. For example, the work related to the plastic deformation of the strip heats the working rolls at a temperature of the order of 100 to 150 ° C. Thus, although the rolling takes place at room temperature in the case of cold rolling, the temperature in the grip of the work rolls increases considerably. This can result in breakage of the lubricating film leading to seizures and / or degradation of the surface quality of the rolled strip. The heating of the rolls, particularly the work rolls, is also likely to generate flatness and transverse profile defects of the band by non-homogeneous swelling of the diameter of the working roll along its length. It is therefore important that the watering of the rolls and the strip is optimal so as, on the one hand, to guarantee the formation and maintenance of a continuous lubricating film between the contact surfaces of the working rolls with the strip, and on the other hand, to ensure efficient cooling of the belt and cylinders. It is thus common practice, in cold rolling, to cool the working cylinders by sprinkling under pressure with a coolant coolant. Generally, systems comprising watering nozzles make it possible to water at least part of the strip or part of the rolls with said coolant coolant.

The patent EP 1 118 395 B1 The applicant describes the problem of cold rolling, as well as practical arrangements for watering with an adjustable flow rate over the width of the rolls in order to correct their expansions as a function of flatness measurements made on the rolled strip. The method and the device described by the patent EP 1 118 395 B1 allow to cool and lubricate the conventional quarto or sexto mills, but become ineffective for laterally supported mills.

Indeed, in the case of a typical quarto or sexto rolling mill, the watering of the work rolls is easily achievable because the accessibility to the rolls is excellent, as shown EP 1 118 395 B1 . The problem is radically different for a sexto type mill supported laterally. Indeed, the design of the laterally supported rolling mills is such that the space available between the lateral support members (ie the support rollers and the rollers) and the band is very small and prevents easy access to the work rolls. contact with the band. A passage window for fluid jets typically measures 30 to 60 mm and reaches values as low as 10 mm. On the other hand, the lateral size of said lateral support members is important and imposes a distance between the spray nozzles and the working rolls of several hundred millimeters, for example 400 mm to 500 mm. Under these conditions, direct watering of the working cylinders is impossible. The skilled person is therefore always satisfied with a very important watering of the band which conveys a maximum of heat transfer fluid into the grip of the cylinders, as shown in the document US 4,531,394 .

An improvement was proposed by the document EP 1 721 685 A1 of removing the lateral supports (ie lateral support rollers and rollers) on one side of the two working rolls in order to mount, in their place and place, a watering system whose nozzles are directly directed towards the rolls of job. Such an arrangement is likely to solve the cooling problems of the cylinders, but is limited in its applications. Indeed, as specified in this document, the application is strictly reserved for rolling mills operating in a stable rolling regime, ie with a band that does not cause transverse force torque variations which would result, for example, from booster welds. at the end of tapes, and for a only direction of movement of the band. In this case, the lateral forces applied to the working rolls by the tangential force of the rolling torque transmission from the intermediate rolls are assumed to always act in one direction and the lateral supports are removed on the output side of the roll off. of the grip. This provision therefore remains prohibited to reversible mills whose direction of travel of the belt changes at each rolling pass, and those whose rolling regimes vary sufficiently so that the lateral forces on the working cylinders can change direction.

An object of the present invention is to provide a method and a device for direct watering on both sides of the working rolls of a rolling mill with reversible or non-reversible operation, supported laterally. The two sides of the work roll correspond, when the web travels in one direction, to a first side of the cylinder facing the incoming web in the air gap of the work rolls and to a second side of the roll facing the web. outgoing band of the air gap of the working cylinders.

For this purpose, a device and a method are provided by the contents of claims 1 and 9. A set of subclaims also has advantages of the invention.

• un laminage, par une paire de cylindre de travail à axes longitudinaux parallèles, de ladite bande prise entre lesdits cylindres de travail et défilant entre ladite paire de cylindre de travail selon un plan de défilement parallèle audits axes longitudinaux et en particulier équidistants de ces derniers, chacun desdits cylindres de travail ayant au moins une génératrice de contact en contact avec ladite bande,
• une transmission aux cylindres de travail d'un effort de laminage sensiblement normal à la bande et servant audit laminage de la bande, par une paire de cylindres de soutien à axes longitudinaux parallèles situés de part et d'autre de la bande, lesdits cylindres de soutien et cylindres de travail situés d'un même côté de bande étant en contact l'un avec l'autre le long d'une génératrice de soutien commune, i.e. appartenant au cylindre de travail et au cylindre de soutien, afin de transmettre ledit effort de laminage,
• un plan perpendiculaire à une direction de défilement de la bande, dans lequel se trouvent au moins une desdites génératrices de contact et lesdits axes longitudinaux desdits cylindres de travail,
• un maintien de chacun desdits cylindres de travail par une paire de cylindres d'appui situés, symétriquement ou non, de part et d'autre dudit plan perpendiculaire, chacun desdits cylindres d'appui étant apte à exercer, le long d'une génératrice d'appui dudit cylindre de travail, notamment en fonction d'un sens de défilement de la bande, un effort maintenant l'axe longitudinal dudit cylindre de travail dans une position déterminée par rapport à ladite cage de laminage et auxdits cylindres d'appui,
• un arrosage, en particulier par aspersion d'au moins un jet de fluide, par au moins un système de buses d'au moins une partie de la bande et au moins une partie desdits cylindres de travail,

la méthode selon l'invention est caractérisée par au moins une aspersion directe d'au moins une partie des cylindres de travail, en particulier de part et d'autre dudit plan perpendiculaire à la direction de défilement de la bande. En d'autres termes, la méthode selon l'invention permet entre autre d'arroser directement une partie du cylindre qui, d'un côté du plan perpendiculaire, entre progressivement en contact avec ladite bande lorsque celle-ci entre dans l'entrefer et/ou, de l'autre côté du plan perpendiculaire, quitte progressivement le contact avec ladite bande, et correspondant respectivement au côté du cylindre faisant face à la bande entrante, et au côté du cylindre faisant face à la bande sortante.From a watering method adapted to a rolling mill of a moving metal strip comprising at least one reversible or non-reversible rolling mill, comprising:

• rolling, by a pair of working rollers with parallel longitudinal axes, said strip taken between said working rolls and moving between said pair of working rolls according to a plane of parallel scroll audits longitudinal axes and in particular equidistant from them, each of said working rolls having at least one contact generator in contact with said strip,
• a transmission to the working rolls of a rolling force substantially normal to the strip and serving said rolling of the strip, by a pair of support rollers with parallel longitudinal axes located on either side of the strip, said rolls of support and work rolls located on one side of the web being in contact with each other along a common support generator, ie belonging to the work roll and the support roll, for transmitting said force rolling,
• a plane perpendicular to a running direction of the strip, in which are located at least one of said contact generatrices and said longitudinal axes of said working rolls,
• holding each of said work rolls by a pair of support rollers located, symmetrically or not, on either side of said perpendicular plane, each of said support rolls being able to exert, along a generator of support of said working roll, in particular according to a direction of travel of the band, a force maintaining the longitudinal axis of said work roll in a determined position with respect to said rolling stand and said support rolls,
• watering, in particular by spraying at least one jet of fluid, with at least one nozzle system of at least a portion of the strip and at least a portion of said working rolls,

the method according to the invention is characterized by at least direct spraying of at least a portion of the rolls of work, in particular on both sides of said plane perpendicular to the running direction of the strip. In other words, the method according to the invention makes it possible, among other things, to directly water a portion of the cylinder which, on one side of the perpendicular plane, progressively comes into contact with said strip when it enters the air gap and / or, on the other side of the perpendicular plane, progressively leaves the contact with said strip, and respectively corresponding to the side of the cylinder facing the incoming strip, and the side of the cylinder facing the outgoing strip.

More specifically, each working roll comprises two bearing generatrices, each associated with one of said support rolls being on the same side of the strip as said work roll. Each of said bearing generatrices is defined as the generatrix of said working cylinder belonging to a half plane coming from the longitudinal axis of said working cylinder and comprising the longitudinal axis of the support cylinder with which it is associated.

In particular, the watering method according to the invention is characterized in that the spray is directed in a mean direction substantially perpendicular to the axis of said working cylinder, or in a mean direction substantially tangential to the axis of said cylinder working, or in a combination of mean directions, perpendicular and substantially tangent to the axis of said work roll. Said average direction substantially tangent to the axis of said working cylinder is for example a mean direction at an angle between 0 ° and 15 ° relative to the axis of said cylinder, so that the jet of a nozzle is adapted to watering said working roll over its entire length when said nozzle is placed at one of the two ends of said work roll. In addition, by direction mean, it refers to the average of all directions of watering taken by a jet coming out of a watering nozzle. For example, if a nozzle jet has a straight cone shape whose tip is occupied by the nozzle and the base corresponds to a watered surface, the average direction of the jet will be an axis starting from the tip of the cone and intercepting the center of the the base of said cone. Advantageously, these different possibilities of average watering directions ensure optimum watering of said working rolls, whatever the rolling conditions.

In addition, the method according to the invention is characterized in particular by the watering, for at least one of said working cylinder, of at least a portion of a watering surface defined, according to a first geometry, by a half strip surface plane coming from one of said contact generators and a surface of the working cylinder between this same contact generator and one of said bearing generatrices, such that said watering surface is included in a dihedron acute formed by a first half-plane corresponding to said strip surface half-plane from said contact generator and a second half-plane from said same contact generator and comprising said support generator.

Also, the method according to the invention is also characterized in particular by the watering, for at least one of said working rolls, of at least a part of a watering surface defined, according to a second geometry, by a surface said working cylinder between one of its support generatrices and its support generator. More generally, each of said work rolls comprises a support generator defined as the generatrix of said work roll belonging to a half-plane coming from the longitudinal axis of said work roll, which does not intercept said strip, but including the longitudinal axis of the support roll being on the same side of the strip as said working roll, so that said support generator is a generatrix common to said working roll and said support roll in contact, along said support generator, with the work roll.

Advantageously, each working roll can thus be watered according to four distinct watering surfaces comprising two surfaces defined according to said first geometry, ie limited by one of said contact generators and one or other of said support generatrices and two surfaces. defined according to said second geometry, ie limited in this case by one or other of said generatrices support and said generator support. The working cylinder is thus divided into four surfaces that can be irrigated independently or depending on each other.

In particular, the method according to the invention is characterized by the simultaneous watering of at least two of said watering surfaces defined according to at least one of said geometries.

Advantageously, according to a first watering mode, at least a portion of all the watering surfaces defined according to said first geometry are watered simultaneously, either according to said sprinkling in a mean direction perpendicular to the longitudinal axis of said work roll, or according to said sprinkling in a mean direction substantially tangent to said generatrix said working cylinder.

According to a second watering mode, at least a part of all the watering surfaces according to said first geometry and lying predominantly on the same side of said perpendicular plain are watered simultaneously, or according to said sprinkling in a mean direction perpendicular to the longitudinal axis of said work roll, or in said spray in a mean direction substantially tangent to said generatrix said working roll. Advantageously, the second watering mode applies to a continuous rolling, said irrigated portion then being on the side of an inlet of the rolled strip in the rolling stand.

According to a third watering mode, at least a part of all the watering surfaces defined according to said second geometry are watered simultaneously, either according to said sprinkling in a mean direction perpendicular to the longitudinal axis of said work roll, or according to said sprinkling in a mean direction substantially tangent to said generatrix of said work roll.

According to a fourth watering mode, at least a portion of all the surfaces defined according to said second geometry and lying predominantly on the same side of the perpendicular plane are watered simultaneously, or according to said spray in a mean direction perpendicular to the longitudinal axis of said working cylinder, or according to said spray in a mean direction substantially tangent to said generatrix said working cylinder.

According to a fifth watering mode, at least a portion of all the surfaces defined according to said first and said second geometry and lying predominantly on the same side of said perpendicular plane are watered simultaneously, or according to said sprinkling in a mean direction perpendicular to the longitudinal axis of said working cylinder, or in said spray in a mean direction substantially tangent to said generatrix said working cylinder.

According to a sixth watering mode, at least a part of all the surfaces defined according to said first geometry and being predominantly on one side of said perpendicular plane, as well as at least a part of all the surfaces defined according to said second geometry and being predominantly on the other side of said perpendicular plane, are watered simultaneously, or in accordance with said sprinkling according to a average direction perpendicular to the longitudinal axis of said work roll, or in said spray in a mean direction substantially tangent to said generatrix of said work roll.

Finally, according to a seventh mode of watering, at least a part of all the surfaces defined according to said first and said second geometry are watered simultaneously, either according to said sprinkling in a mean direction perpendicular to the longitudinal axis of said work roll, or according to said sprinkling in a mean direction substantially tangent to said generatrix said working cylinder.

Also, the method according to the invention is characterized by alternating the watering of said watering surfaces defined according to at least one of said first or second geometries. Advantageously, the alternation of the watering can be related to the reversibility function of the rolling installation, so that when the band scrolls in one direction, a first set of nozzles water at least a portion of the surface of said cylinders working in a first watering, then, when the direction of travel is reversed, the first set of nozzles stops watering the band and a second set of nozzles, substantially symmetrical to said first set of nozzles relative to said perpendicular plane, sprinkles, according to a second watering substantially symmetrical said first watering relative to said perpendicular plane, said working rolls.

In addition, the method according to the invention is characterized by a variable flow rate of watering. Advantageously, said flow rate may vary over time for the same nozzle, or from one nozzle to another at a given time, in particular, according to a position or a location of said nozzles. In a non-exhaustive manner, this variation in flow rate may be related, for example, to a measurement of the flatness of the band or the temperature of one of said working rolls. This measure of flatness is partly related for example to the heating of the cylinder or the strip during the reduction of thickness of the strip. Also, the flow of the nozzles may also vary to accommodate the amount of energy used for the plastic deformation of the band.

• une paire de cylindres de travail à axes longitudinaux parallèles entre lesquels est prise et défile ladite bande, chacun desdits cylindres de travail ayant au moins une génératrice de contact en contact avec ladite bande,
• un plan, perpendiculaire à une direction de défilement de la bande, dans lequel se trouvent au moins une desdites génératrices de contact et les axes desdits cylindres de travail,
• au moins une paire de cylindres de soutien à axes longitudinaux parallèles au plan de laminage défini par la bande et situés de part et d'autre de ladite bande, lesdits cylindres de soutien et cylindres de travail situés d'un même côté de bande étant en contact l'un avec l'autre le long d'une génératrice de soutien commune afin de transmettre aux cylindres de travail, un effort de laminage sensiblement normal à la bande,
• deux paires de cylindres d'appui à axes longitudinaux parallèles, lesdits cylindres d'appui d'une même paire étant situés, symétriquement ou non, de part et d'autre d'un desdits cylindres de travail relativement audit plan perpendiculaire, dans un plan parallèle à la bande afin que chacun desdits cylindres d'appui d'une même paire soit apte à transmettre le long d'une génératrice d'appui dudit cylindre de travail, et notamment en fonction d'un sens de défilement de la bande, un effort permettant un maintien de l'axe dudit cylindre de travail dans une position déterminée relativement à au moins un desdits cylindres de soutien,
• un soutien desdits cylindres d'appui au moyen de deux rangées formées d'une pluralité de galets d'appui montés côte à côte, permettant de maintenir dans une position déterminée lesdits cylindres d'appui et cylindres de travail, ladite position déterminée étant déterminée par rapport à un mouvement des galets d'appui relativement au référentiel de la cage de laminage,
• au moins un système de buses permettant l'arrosage par aspersion d'au moins un jet de fluide sur au moins une partie de la bande et au moins une partie d'un desdits cylindres,

le dispositif selon l'invention est caractérisé en ce que au moins un desdits systèmes de buses est apte à effectuer au moins une aspersion directe d'au moins une partie d'un des cylindres de travail, en particulier de part et d'autre dudit plan perpendiculaire à la direction de défilement de la bande.From a device for watering a rolling mill of a moving metal strip comprising at least one reversible or non-reversible rolling mill, comprising:

• a pair of working cylinders with parallel longitudinal axes between which is engaged and scrolls said strip, each of said working rolls having at least one contact generator in contact with said strip,
• a plane, perpendicular to a running direction of the strip, in which are located at least one of said contact generators and the axes of said working rolls,
• at least one pair of support cylinders with longitudinal axes parallel to the rolling plane defined by the band and situated on either side of said band, said support rolls and working rolls situated on one and the same side of the band being in contacting each other along a common support generator to transmit to the work rolls, a rolling force substantially normal to the strip,
• two pairs of support cylinders with parallel longitudinal axes, said bearing cylinders of the same pair being located, symmetrically or not, on either side of one of said working rolls relative to said perpendicular plane, in a plane parallel to the strip so that each of said support cylinders of the same pair is able to transmit along a bearing generatrix of said working cylinder, and in particular according to a running direction of the strip, a a force which makes it possible to maintain the axis of said working roll in a given position relative to at least one of said support rolls,
• a support of said support cylinders by means of two rows formed of a plurality of support rollers mounted side by side, for maintaining in a predetermined position said support cylinders and working rolls, said determined position being determined by relative to a movement of the support rollers relative to the reference frame of the rolling stand,
• at least one nozzle system for spraying at least one fluid jet onto at least a portion of the belt and at least a portion of one of said cylinders,

the device according to the invention is characterized in that at least one of said nozzle systems is capable of performing at least a direct spraying of at least a part of one of the working rolls, in particular on either side of said plane perpendicular to the running direction of the tape.

In particular, the device according to the invention is characterized in that said nozzle system is adapted to water at least a portion of one of said working rolls in a mean direction substantially perpendicular to said axis of the work roll, or to water a part of a surface said working cylinder in a mean direction substantially tangent to the axis of said working roll, ie forming for example an angle between 0 ° and 15 ° with respect to the axis of said work roll or with respect to a portion of said generatrices of said cylinder. Advantageously, the device according to the invention is able to combine said watering in a mean direction substantially perpendicular to the axis of one of said working cylinders with said watering in a mean direction substantially tangent to the axis of one of said cylinders of job. The combination of these two mean directions of watering ensures optimum watering of said working rolls by ensuring a dynamic circulation of the fluid, and thus improves the rolling quality of the strip.

In particular, the device according to the invention is characterized in that the nozzle system providing watering in a mean direction substantially perpendicular to the axis of the working cylinder comprises a plurality of nozzles, arranged in line along the width of the strip, interposed between the support rollers, in particular interposed at a fixing of said rollers on a roller support. Advantageously, thanks to this arrangement of the nozzles between the rollers, the distance to be traveled by the jet to reach one of said working rolls is reduced from 400-500 mm to 200-250 mm. This reduction, besides the fact that it makes it possible to directly reach the surfaces of the work rolls directly with a jet of fluid without the fluid jet being masked by the support rollers, also has the advantage of more jets. coherent ensuring a more powerful impact on the surface of said work rolls and thus facilitating heat exchange. In addition, another advantage related to the fact that the nozzles are embedded on the supports of said rollers is that said nozzles move at the same time as said rollers depending on the wear of the work rolls and therefore of the correlative displacement of the supports of the rollers without it being necessary to make adjustments to the adjustment of their positions.

Also, the device according to the invention is characterized in that said rollers comprise an active bearing surface constituted by an outer cylindrical surface of a hard material jacket. In particular said hard material jacket is made of steel and advantageously has a tubular shape, i.e. more precisely the shape of a hollow straight cylinder with or without internal recesses. In addition, each of said rollers comprises at least one rolling member adapted to allow a rotation of said roller about an axis of rotation passing through its center of mass and parallel to at least one generatrix of said outer cylindrical surface of said roller. Advantageously, positioning said rolling members inside said rollers frees a place between the rollers. Said place was occupied until now, ie in the state of the prior art, by a member adapted to allow a rotation of rollers, whereas advantageously, the device according to the invention uses this place to insert said nozzles for watering said work rolls.

In particular, said axis of rotation is a fixed axis mounted on at least one roller support transmitting lateral forces to at least one structure of said rolling stand. Thus, attachment of the support rollers is provided by said fixed axis which passes completely through each of said rollers and is adapted to support each rolling member, so that each of said rollers is rotatable about said fixed axis. In addition, said fixed axis is assembled to said roller support, in a fixed manner, at each of its two ends. In particular, said fixed axis is either a single axis passing through all the rollers of the same line of rollers, while being supported by the roller supports between each roller, or a particular axis to each roller so that each roller is traversed by its own fixed axis which is each time mounted at its ends to said roller support. Thus, said row of support rollers is formed of rollers, roll supports and either a single fixed axis or a plurality of fixed axes whose number corresponds to the number of rollers belonging to said row.

In addition and in particular, said liner of a roller receives, at each end of its inner cylindrical surface, at least one of said rolling members strictly included in an internal right cylinder volume formed by said inner cylindrical surface. In a non-exhaustive manner, said rolling member is a ball or roller or needle assembly, protected or not protected from the environment external to the roller by a system of at least one packing strictly included in said volume of internal straight cylinder, such as for example a rubber, polymer or soft metal seal. Advantageously, in the case of watering with a lubricating fluid lubricating properties such as an oil, a lubrication of said rollers, said rolling members and the air gap is provided by said watering fluid. In this case, the bearing members are free of packing gaskets. On the other hand, if the watering fluid is based, for example, on an emulsion of rolling fluid in water, said bearing members are protected from said emulsion by said seals, which are then able to maintain said rolling members in a lubricated state. In particular, a lubrication of said rolling members is provided by a lubricating grease bearing members retained by said seals.

Advantageously, said rolling members are commercial, ball, roller or needle bearings chosen to be sealed or unsealed according to the lubricating characteristics of the irrigation fluid, particularly if the latter is for example respectively an emulsion based on water or oil. As an alternative to commercial bearings, said rolling members may be balls, rollers or needles, disposed between said attachment and said sleeve of said roller, or directly between said fixed axis and said sleeve, to allow rotation of said sleeve around said fixed axis. Advantageously, a use of non-commercial bearings brings a saving of space in the volume of said internal right cylinder. This saving of space can then be used to size the roller so that it supports a pressure greater than that supported when using a commercial bearing.

In a particularly advantageous manner, the device according to the invention is characterized in that each roller is able to be pressurized under an internal gas pressure slightly higher than the atmospheric pressure, for example by means of compressed air, in order to avoid any infiltration and retention of fluid in the rollers, in particular fluid that is harmful to the lubrication of the running gear.

Also, the device according to the invention could for example comprise at least two nozzles distributed substantially symmetrically, or with respect to a median plane of the strip, said median plane being equidistant from said axes of the working rolls and parallel to the strip, either with respect to the plane defined by said perpendicular plane, or with respect to a combination of the two planes, perpendicular and median. Advantageously, the symmetry defined by said symmetrical distribution of the nozzles ensures a supply of cooling fluid and identical lubrication, either for each of said work rolls, for one side of said work roll facing the tape entrance and the other side of said roll facing the tape exit.

On the other hand, the device according to the invention is characterized in that said nozzle system comprises at least one nozzle attached to at least one support, or in particular an axial abutment support, integrating or not a bearing, with one of said working cylinders. Advantageously, fixing said nozzle to said support allows said watering in a mean direction substantially tangent to the axis of one of said working rolls, in particular forming said angle between 0 ° and 15 ° with the axis of one of said working cylinders.

For example, it is possible to imagine that the device according to the invention could be characterized in that the nozzle system is adapted to water at least a portion of a watering surface defined, according to a first geometry, by a half-plane of strip surface coming from one of said contact generators and a surface of the working roll between this same contact generator and one of said bearing generatrices, such that said watering surface is included in a dihedron acute formed by a first half-plane corresponding to said half-plane of strip surface from said same contact generator and a second half-plane from said same contact generator and comprising said support generatrix. In addition, in another variant, the device according to the invention could for example be characterized in that the nozzle system is adapted to water at least a portion of a defined watering surface, according to a second geometry, by a surface of the working cylinder between one of its generatrices of support, and, its generator of support. Finally, according to a last variant, the device according to the invention could for example be characterized in that the nozzle system is adapted to combine the watering of watering surfaces defined according to said first geometry and / or said second geometry.

Also, the nozzle system according to the invention could for example be adapted to simultaneously water at least a portion of at least two of said watering surfaces defined according to at least one of said geometries.

• Selon un premier mode d'arrosage, le système de buses est apte à arroser simultanément au moins une partie de toutes les surfaces d'arrosage définies selon ladite première géométrie, soit selon ladite direction moyenne sensiblement perpendiculaire à l'axe longitudinal dudit cylindre de travail, soit selon ladite direction moyenne sensiblement tangente à l'axe dudit cylindre de travail.

More completely, several watering modes can be defined:

• According to a first watering mode, the nozzle system is able to simultaneously water at least a portion of all the watering surfaces defined according to said first geometry, or in said mean direction substantially perpendicular to the longitudinal axis of said working cylinder. or in said mean direction substantially tangent to the axis of said work roll.

According to a second watering mode, the nozzle system is capable of simultaneously watering at least a portion of all the watering surfaces according to said first geometry lying predominantly on the same side of said perpendicular plane, or in said mean direction substantially perpendicular to the longitudinal axis of said work roll, or in said mean direction substantially tangent to the axis of said work roll. Advantageously, the second watering mode applies to a continuous rolling, said irrigated portion then being on the side of an inlet of the rolled strip in the rolling stand.

According to a third watering mode, the nozzle system is able to simultaneously water at least a portion of all the watering surfaces defined according to said second geometry, or in said mean direction substantially perpendicular to the longitudinal axis of said working cylinder. or in said mean direction substantially tangent to the axis of said work roll.

According to a fourth embodiment, the nozzle system is capable of simultaneously watering at least a portion of all the surfaces defined according to said second geometry, which is predominantly on the same side of the perpendicular axis, or in said mean direction substantially perpendicular to the axis. longitudinal of said working cylinder, or in said mean direction substantially tangent to the axis of said working cylinder.

According to a fifth mode, the nozzle system is capable of simultaneously watering at least a portion of all the surfaces defined according to said first and said second geometry and being predominantly on the same side of said perpendicular plane, or in said mean direction substantially perpendicular to the longitudinal axis of said work roll, or in said middle direction substantially tangent to the axis of said work roll.

According to a sixth mode, the nozzle system is able to simultaneously water at least a portion of all the surfaces defined according to said first geometry and being predominantly on one side of said perpendicular plane, as well as at least a part of all the surfaces. defined according to said second geometry and being predominantly on the other side of said perpendicular plane, or in said mean direction substantially perpendicular to the longitudinal axis of said working cylinder, or in said mean direction substantially tangent to the axis of said work roll.

Finally, according to a seventh mode, the nozzle system is able to simultaneously water at least a portion of all the surfaces defined according to said first and said second geometry, or in said mean direction substantially perpendicular to the longitudinal axis of said work roll, or in said mean direction substantially tangent to the axis of said working cylinder.

In particular, the device according to the invention is characterized in that the nozzle system is capable of alternately watering said watering surfaces defined according to at least one of said geometries. Advantageously, in the case of a rolling mill roll with a reversible function, the nozzle system is able to make an alternation of the watering of said watering surfaces coincide with an alternation linked to the running direction of the band. Indeed, when the band scrolls in a first direction, a first watering is performed in a first manner, then, when the running direction of the band is reversed, a second watering is performed in a second manner, said second way being defined such that said second watering is substantially symmetrical to said first watering with respect to said perpendicular plane. In particular, the passage of said first watering said second watering is automatically performed when the running direction of the band is reversed. Thus, the alternation of the watering allows, with respect to a reference linked to the rolling stand, to vary the watering according to the direction of travel of the strip, so that, compared to a reference linked to the sense banding, the watering remains substantially identical.

Finally, the device according to the invention is characterized in that a flow control system is adapted to control and to vary the flow of watering of at least one of said nozzles. Advantageously, this control and this flow rate variation make it possible to adapt the flow rate of each nozzle of said watering system as a function, for example, of a position or location of the nozzle in the rolling stand, of a measurement of a temperature profile according to the width of the strip or the length of the working roll. Thus, for the same nozzle, the flow rate of said nozzle is able to vary over time in a manner controlled by said control system. In particular, the nozzles may be fed by a single collector or a plurality of collectors allowing a fractional supply of the fluid nozzles, by adjusting the flow rate of the fluid of each of the collectors between zero and a maximum value. In known manner, this fractional feed can be controlled by a member for measuring the transverse flatness of the rolled strip.

Figure 1

exemple de réalisation d'un dispositif d'arrosage d'un laminoir sexto supporté latéralement selon l'art antérieur.

Figure 2

exemple de réalisation selon l'invention d'un dispositif d'arrosage d'un laminoir sexto supporté latéralement caractérisé par un système de buses intercalées entre les galets d'appui.

Figure 3

exemple de réalisation selon l'invention d'un dispositif d'arrosage d'un laminoir sexto supporté latéralement avec au moins un système de buses monté sur des supports desdits cylindres de travail.

Figure 4

exemple de réalisation selon l'invention d'un dispositif d'arrosage d'un laminoir sexto supporté latéralement, comportant au moins un arrosage des cylindres de travail selon un angle compris entre 0° et 15° par rapport à l'axe desdits cylindres de travail.

Figure 5

exemple de réalisation de galets d'appui selon l'invention.

Figure 6

exemple de réalisation de dispositif d'arrosage sensiblement perpendiculaire à un cylindre de travail selon l'invention.

Exemplary embodiments and applications are provided using the following figures:

Figure 1

embodiment of a watering device of a sexto mill laterally supported according to the prior art.

Figure 2

embodiment of the invention of a watering device of a laterally supported sexto mill characterized by a system of nozzles interposed between the support rollers.

Figure 3

embodiment of the invention of a watering device of a sexto mill supported laterally with at least one system of nozzles mounted on supports of said work rolls.

Figure 4

embodiment of the invention of a watering device of a laterally supported sexto mill, comprising at least one watering of the working rolls at an angle between 0 ° and 15 ° relative to the axis of said rolls of job.

Figure 5

exemplary embodiment of support rollers according to the invention.

Figure 6

embodiment of irrigation device substantially perpendicular to a working cylinder according to the invention.

For example, the figure 1 shows a watering of a sexto mill laterally supported according to the prior art. The strip (1) passes between two working cylinders (2a, 2b) supported vertically by a first pair of intermediate support cylinders (3a, 3b), themselves supported vertically by a second pair of final support cylinders (4a, 4b) bearing on said first pair of support rolls (3a, 3b). The working cylinders (2a, 2b) are also supported laterally by two pairs of lateral bearing cylinders (5a, 5b) on the input side of the strip and (5'a, 5'b) on the output side. Each of the lateral support cylinders is itself supported laterally by two rows of support rollers (6), each row being composed of a plurality of rollers arranged side by side along a common axis on a common support (10). two rows.

Sprinkler nozzles (7a, 7b) dispense fluid for lubrication of the strip prior to entering the right-of-way and other nozzles (7'a, 7'b) dispense fluid for cooling the web after it leaves the right-of-way. Other watering nozzles (9a, 9a ', 9b, 9b') cool the intermediate and support rolls and, indirectly by conduction between rolls, that of the working rolls.

• une paire de cylindres de travail (2a, 2b) à axes longitudinaux parallèles entre lesquels défile ladite bande (1), chacun desdits cylindres de travail (2a, 2b) ayant au moins une génératrice de contact en contact avec ladite bande (1),
• un plan perpendiculaire (P) à une direction de défilement de la bande (1), dans lequel se trouvent au moins une desdites génératrices de contact et les axes desdits cylindres de travail,
• au moins une paire de cylindres de soutien (3a, 3b) à axes longitudinaux parallèles au plan de la bande (1) et situés de part et d'autre de ladite bande (1), lesdits cylindres de soutien et cylindres de travail (2a, 2b) situés d'un même côté de bande étant en contact l'un avec l'autre le long d'une génératrice de soutien commune afin de transmettre aux cylindres de travail (2a, 2b) un effort de laminage sensiblement normal à la bande, lesdits cylindres de soutiens (3a, 3b) étant eux-mêmes soutenus par des cylindres de soutiens finaux (non représentés) tel que les cylindres de soutiens finaux (4a, 4b) présentés en figure 1,
• deux paires de cylindres d'appui (5a, 5'a, 5b, 5'b) latéral à axes longitudinaux parallèles, lesdits cylindres d'appui (5a, 5'a, 5b, 5'b) d'une même paire étant situés, symétriquement ou non, de part et d'autre d'un desdits cylindres de travail (2a, 2b) relativement audit plan perpendiculaire (P), dans un plan parallèle à la bande (1) afin que chacun desdits cylindres d'appui d'une même paire transmette le long d'une génératrice d'appui dudit cylindre de travail (2a, 2b) un effort permettant un maintien de l'axe dudit cylindre de travail dans une position déterminée relativement à au moins un desdits cylindres de soutien (3a, 3b),
• un soutien desdits cylindres d'appui (5a, 5'a, 5b, 5'b) au moyen de deux rangées formées d'une pluralité de galets (6) d'appui montés côte à côte selon un axe commun sur un support (10) commun à deux rangées, lesdits galets (6) permettant de maintenir dans une position déterminée lesdits cylindres d'appui (5a, 5'a, 5b, 5'b) et cylindres de travail (2a, 2b),
• au moins un système de buses permettant l'arrosage par aspersion d'au moins un jet de fluide sur au moins une partie de la bande et au moins une partie d'un desdits cylindres,

et est caractérisée en ce qu'au moins un desdits systèmes de buses est apte à effectuer au moins une aspersion directe d'au moins une partie des cylindres de travail (2a, 2b) de part et d'autre dudit plan perpendiculaire (P) à la direction de défilement de la bande.The figure 2 shows a watering of a rolling mill of a metal strip (1) running in a continuous or reversible manner, respectively, comprising at least one respectively non-reversible or reversible rolling mill, said cage comprising:

• a pair of working cylinders (2a, 2b) with parallel longitudinal axes between which said strip (1) passes, each of said working rolls (2a, 2b) having at least one contact generator in contact with said strip (1),
• a plane perpendicular (P) to a running direction of the strip (1), in which are located at least one of said contact generators and the axes of said working rolls,
• at least one pair of support cylinders (3a, 3b) with longitudinal axes parallel to the plane of the band (1) and situated on either side of said band (1), said support cylinders and work rolls (2a , 2b) located on one side of the web being in contact with each other along a common support generator in order to transmit to the work rolls (2a, 2b) a rolling force substantially normal to the band, said support cylinders (3a, 3b) being themselves supported by final support cylinders (not shown) such that the final support cylinders (4a, 4b) presented in FIG. figure 1 ,
• two pairs of lateral bearing cylinders (5a, 5'a, 5b, 5'b) with parallel longitudinal axes, said cylinders bearing (5a, 5'a, 5b, 5'b) of the same pair being located, symmetrically or not, on either side of one of said working rolls (2a, 2b) relative to said perpendicular plane (P), in a plane parallel to the strip (1) so that each of said support rollers of the same pair transmits along a bearing generatrix of said work roll (2a, 2b) a force allowing a maintaining the axis of said working roll in a predetermined position relative to at least one of said support rolls (3a, 3b),
• a support of said support cylinders (5a, 5'a, 5b, 5'b) by means of two rows formed of a plurality of support rollers (6) mounted side by side along a common axis on a support ( 10) common to two rows, said rollers (6) for maintaining in a predetermined position said bearing cylinders (5a, 5'a, 5b, 5'b) and working rolls (2a, 2b),
• at least one nozzle system for spraying at least one fluid jet onto at least a portion of the belt and at least a portion of one of said cylinders,

and is characterized in that at least one of said nozzle systems is adapted to perform at least direct spraying of at least a portion of the working rolls (2a, 2b) on either side of said perpendicular plane (P) to the running direction of the tape.

According to at least one of the watering modes described above, and according to a first watering system, the watering nozzles (11a, 11b) interposed between said rollers (6) each distribute the watering fluid in a respective dihedron. Indeed, at least one of said watering nozzles (11a) distributes the watering fluid in the dihedron formed by a first incoming band surface half-plane coming from one of said contact generators of one of said cylinders working (2a) and a second half plane coming from the same contact generatrix and comprising said support generatrix of one of said working cylinder (2a), such that the two half-planes and the nozzle (11a) are located on the same side of the tape. Respectively, at least one other of said watering nozzles (11b) distributes the watering fluid in the dihedron formed by another first incoming band surface half-plane coming from another of said contact generators of the other of said working cylinders (2b) and another second half-plane coming from the same other contact generator and comprising said support generatrix of the other of said working cylinder (2b), so that the other two half-planes and said other nozzle (11b) are located on the same other side of the strip.

According to a second watering system, other nozzles (11'a, 11'b) distribute the watering fluid each respectively in another dihedron on the output side of the strip, so that the second system of watering and watered surfaces are in particular substantially symmetrical to said first watering system relative to said perpendicular plane (P).

Again, according to one of said watering modes described above and according to a third watering system, the nozzles (14a, 14b) for watering distribute the watering fluid each respectively in a respective dihedron. At least one of said watering nozzles (14a) distributes the watering fluid in the dihedron formed by a first half-plane parallel to the incoming band coming from one of said bearing generatrices of one of said work rolls (2a), and a second half-plane from the same bearing generatrix and comprising the support generatrix of the same working cylinder (2a), so that the two half-planes and the nozzle (14a) are located d one side of the band. Respectively, at least one of said other nozzles (14b) for watering distributes the irrigation fluid in the dihedron formed by another first half-plane parallel to the incoming band coming from another of said bearing generatrices of the other of said work rolls (2b) and another second half-plane from the same other generator support member and including the support generator of the same other work roll (2b), so that the other two half-planes and said other nozzle (14b) are located on the same other side of the strip.

According to a fourth watering system, other nozzles (14'a, 14'b) distribute the watering fluid each respectively in another dihedron on the outlet side of the strip, so that the fourth system of watering and watered surfaces are in particular substantially symmetrical said third irrigation system relative to said perpendicular plane (P).

Other unrepresented spray nozzles typically provide cooling of the support rolls. The nozzles are all mounted on the supports (10) of the rollers (6) in an attachment zone of said fixed axes completely traversing said rollers.

The figure 3 shows the watering of a laterally supported sexto mill, different from the watering presented in figure 2 only in that said watering is also feasible from at least one nozzle system mounted on at least one support of said working rolls (2a, 2b). In this case, nozzles or groups of spray nozzles can in particular be installed directly near at least one of the bearings or one of the axial abutment supports of said work rolls (2a, 2b), on both sides. other of said perpendicular plane (P). In particular, according to a fifth watering system, at least two nozzles (12a, 12b) for watering each distribute the watering fluid in a respective dihedron. Indeed, at least one of said watering nozzles (12a) distributes the watering fluid in the dihedron formed by a first incoming band surface half-plane coming from one of said contact generators of one of said cylinders working piece (2a), and a second half-plane coming from the same contact generatrix and comprising said support generatrix of one of said working cylinder (2a), such as the two half-planes and the nozzle (12a). ) are located on the same band side. Respectively, at least one of said other watering nozzles (12b) distributes the watering fluid in the dihedron formed by another first incoming band surface half-plane coming from another of said contact generators belonging to the other said work rolls (2b), and another second half-plane from the same other contact generator and comprising said support generator of the other of said work roll (2b), so that said two other half and said other nozzle (12b) watering are located on the same other side of the band.

According to a sixth watering system, other watering nozzles (12'a, 12'b) distribute the watering fluid, each respectively in another dihedron on the outlet side of the strip, so that the sixth watering system and the watered surfaces are in particular substantially symmetrical said fifth irrigation system relative to said perpendicular plane (P).

In addition, according to a seventh watering system, at least two nozzles (13a, 13b) for watering distribute the watering fluid each respectively in a respective dihedron. At least one of said watering nozzles (13a) distributes the watering fluid in the dihedron formed by a first half-plane parallel to the incoming band coming from one of said bearing generatrices of one of said working cylinder (2a) and a second half-plane from the same support generator and comprising the support generatrix of said working cylinder (2a), so that the two half-planes and the nozzle (13a) are located on the same side of the strip. Respectively, at least one of said watering nozzles (13b) distributes the watering fluid in the dihedron formed by another first half-plane parallel to the incoming band coming from another of said support generators of the other said work rolls (2b) and another second half-plane from the same other support generator and including the support generator of the other of said work rolls (2b), so that the other two half-planes and said other nozzle (13b) are located on the same other side of the band.

Also, according to an eighth watering system, other nozzles (13'a, 13'b) distribute the watering fluid each respectively in another dihedron on the output side of the strip, so that the eighth system and watered surfaces are in particular substantially symmetrical said seventh watering system relative to said perpendicular plane (P).

The orientation of the nozzles according to the fifth, sixth, seventh and eighth watering systems is such that the watering fluid is injected on the working cylinders (2a, 2b) and / or on the strip (1) at an angle between 0 and 15 ° with respect to the axis of said working rolls (2a, 2b), while the orientation of the nozzles according to the first, second, third and fourth watering systems is such that the watering fluid is injected on the working cylinders (2a, 2b) and / or on the strip (1) in a mean direction substantially perpendicular to the axes of said work rolls. In addition, and advantageously, the nozzles (12a, 12b, 12'a, 12'b, 13a, 13b, 13'a, 13'b) forming the fifth to eighth irrigation system, are capable of being mounted on one of the supports of one end of said cylinders working piece (2a, 2b), in particular, on each of the supports supporting each of the ends of said work rolls, or in the vicinity of said ends, such as for example in the vicinity or on an axial abutment support of one of said ends of said work rolls; one of said work rolls. In addition, said nozzles (12a, 12b, 12'a, 12'b, 13a, 13b, 13'a, 13'b) forming the fifth to eighth watering system are at least partly arranged substantially symmetrically with respect to other nozzles, mounted on another support of said working rolls (2a, 2b), in particular in the vicinity of said support or the end of said axis of the work roll, said other support holding the other ends of said work rolls ( 2a, 2b).

The figure 4 shows an example of arrangement of the watering nozzles for a sexto mill supported laterally by support rollers (6) supporting lateral support rollers (5), each of said nozzles being able to water at least one of said work rolls (2) at an angle alpha (α) between 0 ° and 15 ° relative to the longitudinal axis (L) of rotation of said work rolls (2). Preferably, a neighborhood of the ends of the working rolls (2) comprises for each of said work rolls, at least one watering system comprising one or more nozzles (13, 13 ', 15, 15') adapted to water said working rolls (2) by means of sprinkler jets directed along the length of said work rolls (2), so that said jet of nozzles, which nozzles face each other and are at two distinct ends of a said working rolls are opposing jets, in particular symmetrical, which make it possible to water on the one hand parts of said working rolls (2) close to the band and, on the other hand, parts of said rolls (2) working close to said support cylinders, the direction of said jet forming angles between 0 ° and 15 ° with respect to the longitudinal axis (L) of rotation of said work rolls (2). By proximity of the ends of the working rolls, reference is made non-exhaustively to each of the supports (17, 18) of said working rolls, in the vicinity of an axial abutment (20) or a bearing of a said working cylinder, or preferably an axial abutment support (19) which already comprises a lubrication system for lubricating bearing members of the work rolls and a modification for serving to supply one of said nozzle systems suitable for watering said work rolls in a direction substantially tangent to the axis of said work rolls.

On the other hand, at least a first watering can advantageously be completed by at least a second watering. Said first watering is carried out by a first nozzle (15) mounted in the vicinity of one of the ends of one of said working rolls (2), said first nozzle (15) watering at least a first part of a surface of said cylinder of work (2), said first portion being predominantly on one side of said perpendicular plane (P) and being either between a first contact generator belonging to the band surface plane and a first support generator, or between said first bearing generator and said generatrix supporting said cylinder. Said second watering is then carried out by a second nozzle (13 ') mounted in the vicinity of the other end of said working cylinder (2), said second nozzle (13') watering at least a second portion of a surface of said cylinder of work (2), said second portion being predominantly on the other side of said perpendicular plane (P) and being between a second contact generatrix belonging to the band surface plane and a second support generatrix, or between said second support generatrix and said support generatrix of said working cylinder (2). Advantageously, according to this configuration defined by said first and said second watering, a nozzle mounted for example on a bearing on one side of the perpendicular plane (P) and another nozzle mounted on an opposite bearing on the other side of the perpendicular plane (P) are suitable for provide watering to avoid creating cooling gradients along the working cylinder concerned.

The figure 5 shows an exemplary embodiment of a support roller (6) adapted to the implementation of the device according to the invention. A cylindrical liner (61) has at each of its ends a rolling element (62) ball or roller or needle and possibly a seal (63) not exceeding the overall size of said liner. The fixing of the rollers on supports (10) of rollers which transmit the lateral forces from the rolling mill to the structure of the mill is provided by an axis (64) which completely traverses the roller supporting the rolling members (62) and which is assembled to the supports, at each of its two ends, in particular by a screw passing through a fixing hole (641). The coolant nozzles are mounted on the roll supports (10) at the assembly regions of the roll pins (64) to the said supports (10), so that at each attachment of the said roll pin (64) to the said support (10) is positioned at least one of said nozzles. In addition and in particular, an axial channel (642) of compressed air circulation crosses the axis along its length and distributes compressed air between the rolling members (62) and the seals (63) by radial channels not shown. A compressed air sealing member (644) is mounted between two adjacent ends of two consecutive rollers. Optionally a bushing (643) ensures the continuity of the axial channel (642) between two rollers.

The figure 6 shows an exemplary embodiment, according to the invention, of irrigation device substantially perpendicular to one of said working rolls. It is more specifically the assembly of a line or row of support rollers (6) according to the invention. Two lateral support rollers (5) support a work roll (2) and are themselves supported by two rows of support rollers (6). On a support (10) are fixed the rollers (6) as well as the nozzles, such as for example the nozzle (14) whose jet (141) sprinkles with a watering fluid at least a part of the surface of a said work rolls (2). Each of said nozzles fixed at the level of attachment to the support (10) of rollers of the axis of said rollers is adapted to water one of said rolls, in particular in a direction substantially perpendicular to the longitudinal axis of rotation (L) of a said work rolls (2).

• ils assurent au moins un arrosage direct des cylindres de travail par des jets de fluide d'arrosage pour une installation de laminage de type sexto supportée latéralement,
• ils permettent un arrosage au moyen de buses d'arrosage dont le jet est sensiblement perpendiculaire à l'axe des cylindres de travail,
• ils permettent un arrosage au moyen de buses d'arrosage dont le jet sensiblement parallèle à l'axe des cylindres, i.e. dont la direction du jet forme en particulier un angle compris entre 0° et 15° avec chacun desdits axes des cylindres de travail,
• ils permettent une injection de fluide d'arrosage directement et simultanément sur plusieurs parties desdits cylindres de travail, optimisant ainsi la lubrification et le refroidissement desdits cylindres,
• ils permettent d'arroser les cylindres de travail d'un laminoir sexto supporté latéralement à fonctionnement réversible ou non réversible,
• ils assurent une distance réduite entre les buses et la surface des cylindres de travail, garantissant ainsi des jets plus cohérents qui assurent un impact plus puissant contre la surface desdits cylindres de travail et qui facilitent ainsi l'échange thermique,
• ils permettent, du fait de la caractéristique des buses d'arrosage aptes à être embarquées sur les supports desdits galets, de déplacer les buses d'arrosage en même temps que lesdits galets en fonction de l'usure des cylindres de travail et donc du déplacement corrélatif des supports de galets, sans qu'il soit nécessaire de procéder à des ajustements du réglage de leurs positions,
• ils permettent une alimentation fractionnée des buses, en particulier via des collecteurs,
• ils permettent un réglage du débit des buses en fonction de leur position dans le laminoir et/ou de mesures de profils de température de la bande,
• ils permettent d'améliorer la qualité de traitement de la bande métallique laminée.

In summary, the method and the device according to the invention have several advantages over existing methods and devices in that:

• they ensure at least direct watering of the working cylinders by sprinkler jets for a laterally supported sexto-type rolling installation,
• they allow watering by means of spray nozzles whose jet is substantially perpendicular to the axis of the working rolls,
• they allow watering by means of spray nozzles whose jet substantially parallel to the axis of the rolls, ie whose direction of the jet forms in particular an angle between 0 ° and 15 ° with each of said axes of the working rolls,
• they allow an injection of coolant directly and simultaneously on several parts of said working rolls, thus optimizing the lubrication and cooling of said rolls,
• they allow to water the working rolls of a sexto mill supported laterally with reversible or non-reversible operation,
• they ensure a reduced distance between the nozzles and the surface of the working rolls, thus guaranteeing more coherent jets which ensure a more powerful impact against the surface of said work rolls and which thus facilitate the heat exchange,
• they make it possible, because of the characteristic of the watering nozzles able to be loaded on the supports of said rollers, to move the watering nozzles at the same time as said rollers as a function of the wear of the working rolls and thus the displacement correlative of the roll supports, without the need to make adjustments to the setting of their positions,
• they allow a split feed of the nozzles, in particular via collectors,
• they allow an adjustment of the flow rate of the nozzles as a function of their position in the rolling mill and / or of temperature profile measurements of the strip,
• they make it possible to improve the processing quality of the rolled metal strip.

Claims (18)

1. Spraying method for a rolling plant for a strip (1) comprising:

   - the rolling, by a pair of working rolls (2a, 2b) with parallel axes, of said strip (1) engaged between said working rolls (2a, 2b) and moving between said pair of working rolls (2a, 2b) along a plane of movement parallel to said axes, each of said working rolls (2a, 2b) having at least one contact generator in contact with said strip (1),

   - the transmission to said working rolls (2a, 2b) of a rolling load substantially normal to the strip (1), by a pair of support rolls (3a, 3b), said support rolls (3a, 3b) and working rolls (2a, 2b) located on the same side of the strip (1) being in contact with each other along a common support generator in order to transmit said rolling load,

   - a plane perpendicular (P) to one running direction of the strip, in which are located at least one of said contact generators and the axes of said working rolls (2a, 2b),

   - the support of each of said working rolls by a pair of bearing rolls (5a, 5'a, 5b, 5'b) located on either side of said perpendicular plane (P), each of said bearing rolls being able to exert, along one bearing generator of said working roll, a load keeping the axis of said working roll (2a, 2b) in a determined position in relation to said rolling stand and to said bearing rolls (5a, 5'a, 5b, 5'b),

   - the spraying by at least one nozzle system of at least one part of the strip and at least one part of said working rolls,
   characterised by

   - at least one direct spraying of at least one part of the working rolls (2a, 2b) on either side of said plane perpendicular (P) to the running direction of the strip.
2. Method according to claim 1, characterised in that the spray is directed in an average direction substantially perpendicular to the axis of said working roll (2a, 2b).
3. Method according to claim 1, characterised in that the spray is directed in an average direction substantially tangential to the axis of said working roll (2a, 2b).
4. Method according to one of claims 1 to 3, characterised by the spraying, for at least one of said working rolls (2a, 2b), of at least one part of a spraying surface defined, according to a first geometry, by a strip-surface half-plane extending from one of said contact generators and a surface of the working roll between this contact generator and one of said bearing generators, such that said spraying surface is contained within an acute dihedral formed by a first half-plane corresponding to said strip surface half-plane extending from said contact generator and a second half-plane extending from that same contact generator and comprising said bearing generator.
5. Method according to one of claims 1 to 4, characterised by the spraying, for at least one of said working rolls (2a, 2b), of at least one part of a spraying surface defined, according to a second geometry, by a surface of the working roll contained within one of its bearing generators and its support generator.
6. Method according to one of claims 1 to 5, characterised by the simultaneous spraying of at least two of said spraying surfaces defined according to at least one of said geometries.
7. Method according to one of claims 1 to 6, characterised by an alternation in the spraying of said spraying surfaces defined according to at least one of said geometries.
8. Method according to claims 1 to 7, characterised by a variable spraying rate.
9. Spraying device for a plant for rolling a strip (1) comprising at least one rolling stand including:

   - a pair of working rolls (2a, 2b) with parallel axes between which said strip (1) moves, each one of said working rolls having at least one contact generator in contact with said strip,

   - a plane perpendicular (P) to one running direction of the strip, in which are located at least one of said contact generators and the axes of said working rolls (2a, 2b),

   - at least one pair of support rolls (3a, 3b) with axes parallel to the plane of the strip (1) that are located on either side of said strip (1), said support rolls (3a, 3b) and working rolls (2a, 2b) located on the same side of the strip being in contact with one another along a common support generator in order to transmit to the working rolls (2a, 2b) a rolling load substantially normal to the strip (1),

   - two pairs of bearing rolls (5a, 5'a, 5b, 5'b) with parallel axes, said bearing rolls of a given pair being located symmetrically on either side of one of said working rolls (2a, 2b) in a plane parallel to the strip such that each of said bearing rolls of a given pair is able to transmit along a bearing generator of said working roll (2a, 2b) a load enabling the axis of said working roll to be kept in a determined position relative to the support roll (3a, 3b),

   - a support of said bearing rolls (5a, 5'a, 5b, 5'b) by means of two rows formed of a plurality of bearing rollers (6) assembled side by side, making it possible to keep said bearing rolls (5a, 5'a, 5b, 5'b) and working rolls (2a, 2b) in a determined position,

   - at least one nozzle system enabling the spraying of at least one jet of fluid over at least one part of the strip (1) and at least one part of one of said rolls,
   characterised in that

   - at least one of said systems of nozzles is able to effect at least one direct spraying of at least one part of the working rolls (2a, 2b) on either side of said plane perpendicular (P) to the running direction of the strip.
10. Device according to claim 9, characterised in that said nozzle system is able to spray at least one part of one of said working rolls (2a, 2b) in a direction substantially perpendicular to said axis of the working roll.
11. Device according to one of claims 9 or 10, characterised in that the nozzle system has a plurality of nozzles inserted between the bearing rollers (6).
12. Device according to one of claims 9 to 11, characterised in that said rollers (6) have an active bearing surface comprising an external cylindrical surface of a steel sleeve that receives, at each extremity of its internal cylindrical surface, at least one bearing member strictly contained within a straight cylindrical volume formed by said internal cylindrical surface.
13. Device according to claim 12, characterised in that a fixing of the bearing rollers (6) is at least provided by an axis passing completely through said rollers and supporting each bearing member.
14. Device according to one of claims 12 to 13, characterised in that said bearing rollers (6) can have at least one sealing gasket able to keep said bearing members lubricated.
15. Device according to one of claims 9 to 14, characterised in that each roller (6) can be pressurised.
16. Device according to one of claims 9 to 15, characterised in that said nozzle system is able to spray one part of said working roll (2a, 2b) in an average direction substantially tangential to the axis of said working roll.
17. Device according to claims 9 to 16, characterised in that said nozzle system has at least one nozzle fixed to at least one support of one of said working rolls.
18. Device according to one of claims 9 to 17, characterised in that at least two nozzles are distributed substantially symmetrically in relation to a median plane of the strip, said plane being equidistant from said axes of the working rolls (2a, 2b).

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