EP0175621A1 - Tandem rolling mill for flat rolling stock - Google Patents

Tandem rolling mill for flat rolling stock Download PDF

Info

Publication number
EP0175621A1
EP0175621A1 EP85401814A EP85401814A EP0175621A1 EP 0175621 A1 EP0175621 A1 EP 0175621A1 EP 85401814 A EP85401814 A EP 85401814A EP 85401814 A EP85401814 A EP 85401814A EP 0175621 A1 EP0175621 A1 EP 0175621A1
Authority
EP
European Patent Office
Prior art keywords
cage
traction
flatness
rolling mill
inter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP85401814A
Other languages
German (de)
French (fr)
Inventor
Marc Valence
Michel Morel
Yves Leclercq
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Clecim SAS
Original Assignee
Clecim SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Clecim SAS filed Critical Clecim SAS
Publication of EP0175621A1 publication Critical patent/EP0175621A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
    • B21B37/36—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control by radial displacement of the roll sleeve on a stationary roll beam by means of hydraulic supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/06—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring tension or compression
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
    • 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
    • B21B27/02—Shape or construction of rolls
    • B21B27/03—Sleeved rolls
    • B21B27/05—Sleeved rolls with deflectable sleeves
    • B21B27/055—Sleeved rolls with deflectable sleeves with sleeves radially deflectable on a stationary beam by means of hydraulic supports

Definitions

  • the invention relates to a tandem rolling mill for flat products in the form of strips comprising a plurality of cages arranged one after the other.
  • the tandem cold rolling mills comprise a succession of cages arranged one after the other on the path of the strip, of which they ensure a gradual reduction in thickness.
  • the strip is kept perfectly tensioned in the space between two successive cages or inter-cage space. To do this, a tension adjustment is made in the strip, in each of the inter-cages, to maintain this traction between two predetermined values which depend on the product being rolled. This maintains the rolling conditions constant in each of the cages and thus avoids reaching tensile levels which would risk causing the strip to break.
  • the regulation of the tandem train cold is ensured so as to obtain a perfectly constant exit thickness from the strip and for this the thickness of the strip leaving the first cage is kept perfectly constant and the speed ratio is adjusted. of the first and the last stand which determines the final thickness at the outlet of the rolling mill.
  • the intermediate stands speeds can be reduced by these conditions because they are imposed by the law of conservation of mass of metal through the ca- gs mill.
  • the rolling mill stands indeed have means for adjusting the tightening of the rolling mill rolls between which the flat product passes during rolling.
  • These clamping devices allow in particular to compensate for the deformations of the cages under the rolling effect, to keep the thickness of the product substantially constant at the outlet of the cage.
  • These clamping devices are generally constituted by screws or hydraulic cylinders arranged at each end of the cylinders by means of which the clamping is carried out. These cylinders are very often support cylinders which transmit the thrust of the screws or jacks of the clamping device to the working cylinders.
  • an error signal is generated which is sent to an acting control device. in the desired direction on the tightening adjustment screws to return the measured traction to the value or within the desired interval.
  • This set is complex and does not always make it possible to obtain a product having perfect flatness.
  • a rolling mill stand for example a quarto stand
  • at least one envelope support cylinder mobile and deformable comprising a tubular casing rotatably mounted around a fixed support and bearing on the latter by means of a series of radially movable holding pads under the action of hydraulic jacks each comprising a jack chamber formed in the fixed support and a piston mounted sliding in the cylinder chamber and integral with the shoe, the latter bearing on the inner surface of the tubular casing with the interposition of an oil film allowing the rotation of the casing.
  • a device placed downstream of the cage makes it possible to measure the flatness defects in different places distributed over the width of the strip and to individually control the thrust of the holding pads placed at the corresponding places along the contact generator of the cylinder d 'support so as to correct accordingly the profile of this generator and therefore of the working cylinder.
  • the chambers of the jacks of the pads for holding the tubular casing of at least one support cylinder are connected to a circuit for the simultaneous supply of pressurized fluid, of which the opening and closing are controlled by a device for measuring the tension of the strip in the inter-cage space placed just upstream, so as to modify the tightening of the cage to adjust the tension of the strip without modifying the shape of the contact generator, by simultaneous displacement and of the same quantity of the set of pistons of the holding pads.
  • the same flatness roller which gives a value of the traction measured at different places over the width of the strip, can advantageously be used for checking the flatness for the cage placed just upstream and at the traction control by adjusting the tightness of the cage placed just downstream, as a function of an average value obtained from the different values of the traction measured over the width of the strip.
  • Figure 1 is a schematic view of the cold rolling mill, in section through a vertical plane parallel to the direction of movement of the strip.
  • FIG. 2 is a cross-sectional view of one of the stands of the rolling mill shown in FIG. 1.
  • Each of the cages has two working cylinders 6 and 7, a lower support cylinder 8 consisting of a solid cylinder and an upper support cylinder 9 with a deformable tubular casing.
  • a flatness measuring device 10 In the inter-cages between the cages 1 and 2, 2 and 3 and 3 and 4, are disposed successively on the path of the strip a flatness measuring device 10 and a device for measuring the traction in the strip 11.
  • the elements relating to the three successive inter-cages will be assigned the indices a, b and c.
  • a device 12 for measuring the thickness of the sheet 5 At the outlet of the cage 1 is placed a device 12 for measuring the thickness of the sheet 5. At the outlet of the cage 4, an additional flatness measuring roller 10d is placed.
  • the upper support roller 9 has a fixed support 15 mounted in the fixed frame 14 of the cage through the ends of shafts 15a and 15b and ball joints 17a and 17b.
  • the roller 9 also comprises a tubular casing 16 whose internal diameter is such that a clearance remains between the fixed support 15 of the roll and the internal surface of the casing 16.
  • the fixed support 15 is machined so as to constitute five chambers 20 of vertical radial direction which can be supplied with hydraulic fluid by a central pipe 23 also machined in the support 15.
  • Pistons 21 are mounted sliding and sealed in the chambers 20 and constitute therewith cylinders for holding the casing 16 in radial direction.
  • the pistons 21 have, at their end directed towards the internal surface of the tubular casing 16, depressions 24 communicating with the chamber 20 supplied with hydraulic fluid.
  • the pistons 21 therefore make it possible, when the chambers 20 of the jacks are supplied with hydraulic fluid, to maintain the casing 16 in the radial direction and to create a film of oil between the end of the piston and the interior surface of the casing 16
  • the envelope 16 can thus rotate around the fixed support 15 practically without friction.
  • a circuit 25 comprising elements electrohydraulic control elements, the opening or closing of which depends on the traction vapor measured by the traction measuring device 11 placed immediately upstream of the cage in question.
  • the value of the traction measured by the device 11 is compared with two reference values between which it is desired to maintain this traction.
  • the pistons 21 of the jacks are moved in one direction or the other, simultaneously and by the same amount, by means of the hydraulic circuit 25.
  • the set of pistons 21 therefore displaces the tubular casing 16 in one direction or the other without modifying the shape of the contact generator between this casing 16 and the upper working roller 6. It is thus possible to modify the tightening of the cage and therefore adjust the traction of the strip upstream of this cage, without modifying the shape of contact generator and therefore the adjustment making it possible to obtain a product of perfect flatness. This is obtained by distributing the displacement cylinders of the envelope of the support cylinder over the entire length of this cylinder.
  • the clamping devices of the rolling mill stands according to the prior art only acted through the ends of the cylinder through which the adjustment was carried out.
  • the four cages 1, 2, 3 and 4 include an assembly allowing the adjustment of the pla born and possibly the thickness adjustment using the upper support roller with deformable envelope.
  • the movements of the five cylinders arranged along the length of the support rollers 9 are no longer controlled as a whole but separately by a control circuit receiving the indications of a flatness roller 10 placed just downstream of the cage considered and possibly as a whole by a control circuit receiving the indications of a thickness measurement gauge such as 12.
  • the means for adjusting the traction on the one hand and the thickness and the flatness on the other hand are therefore very distinct although they make use of the same support roller with a movable and deformable envelope.
  • the main advantages of the rolling mill according to the invention are to allow adjustment of the tension of the strip in the inter-cages not creating a flatness defect and thus avoid the use of means for bending the working rollers for the horn rectification of these flatness defects.
  • the cages equipped with traction adjustment means may comprise two support cylinders with movable and deformable envelopes, the envelopes of these two cylinders being controlled simultaneously for their movement leading to the clamping of the rolling mill, from the indications of the traction measurement device in the inter-cage located upstream.
  • the support rollers with a movable and deformable envelope may have a number of chambers that vary from cage to cage.
  • the tandem cold rolling mill according to the invention can comprise not only the quarto cages as it has been described but also cages having a greater number of rollers, for example sexto cages comprising intermediate cylinders between the support cylinders and the working cylinders.
  • the devices for measuring the traction and the flatness arranged in the inter- cages for controlling the means for adjusting the cages can be not only distinct as in the embodiment which was described but also confused.
  • Such a roller can consist of a series of sections placed one after the other and which, in order to assess the flatness defects, measure the value of the traction in different places distributed over the width of the strip.
  • the measurements obtained from this flatness roller serve on the one hand to individually control the displacements of the cylinders of the support roller with deformable casing arranged upstream of the flatness roller and on the other hand to control identical movements of the cylinders of the roller with a movable and deformable envelope of the cage disposed downstream of the flatness roller.
  • a signal representative of an average traction in the strip is produced, obtained from the indications of the different sections of the flatness measuring roller. .
  • tandem rolling mill according to the invention can be used for the cold rolling of all web-like flat product which passes from one cage to another remaining perfectly stretched in inter-ca q are spaces.
  • the invention also applies to any lami- hot tandem, the control mode of which would be identical to that of a cold tandem rolling mill, as regards the traction of the product during rolling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

Tandem rolling mill for flat rolling stock in the form of strip with adjustment of the traction by hydraulic clamping. At least one of the stands (2, 3, 4) of the rolling mill comprises at least one clamping device (9) consisting of a cylinder having a fixed support and a tubular envelope in contact with one of the working rolls (6, 7) on one of its generatrices and over its entire length. Jacks (20) arranged radially between the fixed support and the tubular envelope hold the latter while permitting its rotation. The jacks (20) are supplied simultaneously with pressurised oil via a hydraulic circuit controlled by a traction measuring device (11) arranged in the intermediate stand situated just upstream of the stand in question. The invention applies, in particular, to four-high stand cold tandem rolling mills. <IMAGE>

Description

L'invention concerne un laminoir tandem pour produit plats sous forme de bandes comportant une pluralité de cages disposées l'une à la suite de l'autre.The invention relates to a tandem rolling mill for flat products in the form of strips comprising a plurality of cages arranged one after the other.

Les laminoires tandem à froid comportent une succession de cages disposées l'une à la suite de l'autre sur le trajet de la bande dont elles assurent une réduction progressive de l'épaisseur. La bande est maintenue parfaitement tendue dans l'espace entre deux cages successives ou espace inter-cage.Pour cela, on effectue un réglage de la traction dans la bande, dans chacun des inter-cages, pour maintenir cette traction entre deux valeurs prédéterminées qui dépendent du produit en cours de laminage. On maintient ainsi les conditions de laminage constantes dans chacune des cages et l'on évite ainsi d'atteindre des niveaux de traction qui risqueraient d'entraîner une rupture de la bande.The tandem cold rolling mills comprise a succession of cages arranged one after the other on the path of the strip, of which they ensure a gradual reduction in thickness. The strip is kept perfectly tensioned in the space between two successive cages or inter-cage space. To do this, a tension adjustment is made in the strip, in each of the inter-cages, to maintain this traction between two predetermined values which depend on the product being rolled. This maintains the rolling conditions constant in each of the cages and thus avoids reaching tensile levels which would risk causing the strip to break.

La régulation du train tandem à froid est assurée de manière à obtenir une épaisseur de sortie de la bande parfaitement constante et pour cela on maintient l'épaisseur de la bande en sortie de la première cage parfaitement constante et l'on règle le rapport des vitesses de la première et de la dernière cage qui détermine l'épaisseur finale en sortie du laminoir. Les vitesses des cages intermédiaires peuvent être réduites de ces conditions car elles sont imposées par la loi de la conservation des masses de métal traversant les ca- ges du laminoir.The regulation of the tandem train cold is ensured so as to obtain a perfectly constant exit thickness from the strip and for this the thickness of the strip leaving the first cage is kept perfectly constant and the speed ratio is adjusted. of the first and the last stand which determines the final thickness at the outlet of the rolling mill. The intermediate stands speeds can be reduced by these conditions because they are imposed by the law of conservation of mass of metal through the ca- gs mill.

Il n'est donc pas possible d'agir sur les vitesses de rotation des cylindres des cages intermédiaires pour régler la traction de la bande dans les inter-cages, et c'est pourquoi on a eu l'idée d'agir sur le serrages des cages pour régler la traction de la bande. Les cages du laminoir comportent en effet des moyens permettant de régler le serrage des cylindres du laminoir entre lesquels passe le produit plat en cours de laminage. Ces dispositifs de serrage permettent en particulier de compenser les déformations des cages sous l'effet de laminage, pour maintenir l'épaisseur du produit sensiblement constant en sortie de la cage. Ces dispositifs de des serrage sont constitués généralement par des vis our vérins hydrauliques disposés à chacun des extrémités des cylindres par l'intermédiaire desquels on réalise le serrage. Ces cylindres sont très souvent des cylindres d'appui qui transmettent la poussée des vis ou des verins du dispositif de serrage aux cylindres de travail.It is therefore not possible to act on the rotation speeds of the cylinders of the intermediate cages to adjust the traction of the strip in the inter-cages, and this is why we had the idea of acting on the tightening cages to adjust the traction of the strip. The rolling mill stands indeed have means for adjusting the tightening of the rolling mill rolls between which the flat product passes during rolling. These clamping devices allow in particular to compensate for the deformations of the cages under the rolling effect, to keep the thickness of the product substantially constant at the outlet of the cage. These clamping devices are generally constituted by screws or hydraulic cylinders arranged at each end of the cylinders by means of which the clamping is carried out. These cylinders are very often support cylinders which transmit the thrust of the screws or jacks of the clamping device to the working cylinders.

Dans le brevet US-A-4 286 447, par exemple, pour régler la traction de la bande dans l'espace inter-cages précédant l'avant-dernière cage du laminoir, on mesure la traction dans cet espace et l'on compare celle-ci à une valeur de référence.In US-A-4,286,447, for example, to adjust the traction of the strip in the inter-cage space preceding the penultimate stand of the rolling mill, the traction in this space is measured and compared this has a reference value.

A partir de la différence constatée dans un sens ou dans l'autre, ou bien en cas de dépassement de l'une ou l'autre de deux valeurs limites, on génère un signal d'erreur qui est envoyé à un dispositif de contrôle agissant dans le sens voulu sur les vis de réglage du serrage pour ramener la traction mesurée à la valeur ou dans l'intervalle souhaité.From the difference found in one direction or the other, or in the event that one or the other of two limit values is exceeded, an error signal is generated which is sent to an acting control device. in the desired direction on the tightening adjustment screws to return the measured traction to the value or within the desired interval.

Dans le cas où la traction mesurée est trop forte, on augmente le serrage, ce qui a pour résultat de diminuer la traction en amont de la cage. Dans le cas contraire, on diminue le serrage hydraulique.In the case where the measured traction is too strong, the tightening is increased, which has the result of reducing the traction upstream of the cage. Otherwise, the hydraulic tightening is reduced.

Un tel procédé a cependant l'inconvénient d'entraîner des variations de la flexion du cylindre par l'intermédiaire duquel on modifie le serrage et donc une modification de la flexion des cylindres de travail pendant le laminage. Il en résulte une variation d'épaisseur du produit plat; cette épaisseur n'etant pas constante dans la direction transversale. Les fibres du produit plat se déforment donc de façon différente suivant la largeur de la tôle; il en résulte des défauts de planéité dans la direction transversale et dans la direction longitudinale de la tôle. Il est donc nécessaire de corriger la flexion des cylindres de travail par des dispositifs de cambrage de ces cylindres qui agissent en sens inverse de la flexion occasionnée par le dispositif de serrage hydraulique.However, such a method has the drawback of causing variations in the bending of the cylinder by means of which the tightening is modified and therefore a modification in the bending of the working rolls during rolling. This results in a variation in thickness of the flat product; this thickness not being constant in the transverse direction. The fibers of the flat product therefore deform differently depending on the width of the sheet; this results in flatness defects in the transverse direction and in the longitudinal direction of the sheet. he It is therefore necessary to correct the bending of the working cylinders by means of cambering these cylinders which act in the opposite direction to the bending caused by the hydraulic clamping device.

Cet ensemble est complexe et ne permet pas toujours d'obtenir un produit ayant une parfaite planéité.This set is complex and does not always make it possible to obtain a product having perfect flatness.

Or , pour régler le profil du produit en cours de laminage, on a déjà proposé (EP-A-140 776) d'équiper une cage de laminoir, par exemple une cage quarto, d'au moins un cylindre d'appui à enveloppe mobile et déformable comprenant une enveloppe tubulaire montée rotative autour d'un support fixe et prenant appui sur ce dernier par l'intermédiaire d'une série de patin de maintien mobiles radialement sous l'action de vérins hydrauliques comprenant chacun une chambre de vérin ménagée dans le support fixe et un piston monté glissant dans la chambre de vérin et solidaire du patin, ce dernier prenant appui sur la surface intérieure de l'enveloppe tubulaire avec interposition d'un film d'huile permettant la rotation de l'enveloppe.However, in order to adjust the profile of the product during rolling, it has already been proposed (EP-A-140 776) to equip a rolling mill stand, for example a quarto stand, with at least one envelope support cylinder mobile and deformable comprising a tubular casing rotatably mounted around a fixed support and bearing on the latter by means of a series of radially movable holding pads under the action of hydraulic jacks each comprising a jack chamber formed in the fixed support and a piston mounted sliding in the cylinder chamber and integral with the shoe, the latter bearing on the inner surface of the tubular casing with the interposition of an oil film allowing the rotation of the casing.

Un dispositif placé en aval de la cage permet de mesurer' les défauts de planéité en différents endroits répartis sur la largeur de la bande et de contrôler individuellement la poussée des patins de maintien placés aux endroits correspondants le long de la génératrice de contact du cylindre d'appui de façon à corriger en conséquence le profil de cette génératrice et par conséquent du cylindre de travail.A device placed downstream of the cage makes it possible to measure the flatness defects in different places distributed over the width of the strip and to individually control the thrust of the holding pads placed at the corresponding places along the contact generator of the cylinder d 'support so as to correct accordingly the profile of this generator and therefore of the working cylinder.

Les inventeurs ont eu l'idée que ces patins, utilisés jusqu'à présent pour régler le profil de la génératrice d'appui,pouvaient également être utilisés pour le réglage du serrage du cylindre en se substituant ou en s'ajoutant avantageusement aux vis ou vérins de serrage utilisés jusqu'à présent pour ce réglage.The inventors had the idea that these pads, used until now to adjust the profile of the support generator, could also be used for adjusting the tightening of the cylinder by replacing or advantageously adding to the screws or clamping cylinders used until now for this adjustment.

A cet effet,selon une caractéristique essentielle de l'invention,les chambres des vérins des patins de maintien de l'enveloppe tubulaire d'au moins un cylindre d'appui, sont reliées à un circuit d'alimentation simultanée en fluide sous pression dont l'ouverture et la fermeture sont commandées par un dispositif de mesure de la traction de la bande dans l'espace inter-cages placé juste en amont, de façon à modifier le serrage de la cage pour régler la traction de la bande sans modifier la forme de la génératrice de contact,par déplacement simultané et de la même quantité de l'ensemble des pistons des patins de maintien .To this end, according to an essential characteristic of the invention, the chambers of the jacks of the pads for holding the tubular casing of at least one support cylinder are connected to a circuit for the simultaneous supply of pressurized fluid, of which the opening and closing are controlled by a device for measuring the tension of the strip in the inter-cage space placed just upstream, so as to modify the tightening of the cage to adjust the tension of the strip without modifying the shape of the contact generator, by simultaneous displacement and of the same quantity of the set of pistons of the holding pads.

Grâce à cette disposition, il devient possible de contrôler en même temps d'une part le réglage de la cage par déplacement simultané des vérins de maintien en fonction d'une mesure de traction effectuée en amont de la cage,et d'autre part la planéité du produit par réglage individuel des vérins de maintien en fonction d'une mesure de planéité effectuée en aval de la cage .Thanks to this arrangement, it becomes possible to control at the same time on the one hand the adjustment of the cage by simultaneous displacement of the holding jacks as a function of a traction measurement carried out upstream of the cage, and on the other hand the flatness of the product by individual adjustment of the holding cylinders according to a flatness measurement carried out downstream of the cage.

Selon une autre caractéristique importante de l'invention, un même rouleau de planéité, qui donne une valeur de la traction mesurée en différents endroits sur la largeur de la bande, peut avantageusement servir au contrôle de planéité pour la cage placée juste en amont et au contrôle de traction par réglage du serrage de la cage placée juste en aval, en fonction d'une valeur moyenne obtenue à partir des différentes valeurs de la traction mesurée sur la largeur de la bande.According to another important characteristic of the invention, the same flatness roller, which gives a value of the traction measured at different places over the width of the strip, can advantageously be used for checking the flatness for the cage placed just upstream and at the traction control by adjusting the tightness of the cage placed just downstream, as a function of an average value obtained from the different values of the traction measured over the width of the strip.

Afin de bien faire comprendre l'invention, on va maintenant décrire à titre d'exemple non limitatif, en se référant aux figures jointes en annexe, un mode de réalisation d'un laminoir tandem à froid pour produits plats, suivant l'invention, comportant quatre cages quarto.In order to clearly understand the invention, a description will now be given, by way of nonlimiting example, with reference to the attached figures, of an embodiment of a cold tandem rolling mill for flat products, according to the invention, with four quarto cages.

La figure 1 est une vue schématique du laminoir à froid, en coupe par un plan vertical parallèle à la direction de déplacement de la bande.Figure 1 is a schematic view of the cold rolling mill, in section through a vertical plane parallel to the direction of movement of the strip.

La figure 2 est une vue en coupe transversale d'une des cages du laminoir représenté à la figure 1.FIG. 2 is a cross-sectional view of one of the stands of the rolling mill shown in FIG. 1.

Sur la figure 1 on voit un laminoir tandem à froid comportant quatre cages 1, 2, 3 et 4 dans lesquelles la tôle 5 passe successivement pour son laminage.In Figure 1 we see a cold tandem rolling mill with four stands 1, 2, 3 and 4 in which the sheet 5 passes successively for its rolling.

Chacune des cages comporte deux cylindres de travail 6 et 7 un cylindre d'appui inférieur 8 constitué par un cylindre plein et un cylindre d'appui supérieur 9 à enveloppe tubulaire déformable.Each of the cages has two working cylinders 6 and 7, a lower support cylinder 8 consisting of a solid cylinder and an upper support cylinder 9 with a deformable tubular casing.

Dans les inter-cages entre les cages 1 et 2, 2 et 3 et 3 et 4, sont disposés successivement sur le trajet de la bande un dispositif de mesure de planéité 10 et un dispositif de mesure de la traction dans la bande 11.In the inter-cages between the cages 1 and 2, 2 and 3 and 3 and 4, are disposed successively on the path of the strip a flatness measuring device 10 and a device for measuring the traction in the strip 11.

Les éléments relatifs aux cages 1, 2, 3 et 4 respectivement seront affectés des indices a, b, c et d respectivement.The elements relating to cages 1, 2, 3 and 4 respectively will be assigned the indices a, b, c and d respectively.

De même, les éléments relatifs aux trois inter-cages successifs seront affectés des indices a, b et c.Similarly, the elements relating to the three successive inter-cages will be assigned the indices a, b and c.

En sortie de la cage 1 est placé un dispositif 12 de mesure de l'épaisseur de la tôle 5. A la sortie de la cage 4, est placé un rouleau de mesure de planéité supplémentaire 10d.At the outlet of the cage 1 is placed a device 12 for measuring the thickness of the sheet 5. At the outlet of the cage 4, an additional flatness measuring roller 10d is placed.

Sur la figure 2, on voit une cage du laminoir représenté sur la figure 1 dont le rouleau supérieur d'appui 9 comporte un support fixe 15 monté dans le bâti fixe 14 de la cage par l'intermédiaire de bouts d'arbres 15a et 15b et de rotules 17a et 17b. Le rouleau 9 comporte également un enveloppe tubulaire 16 dont le diamètre intérieur est tel qu'un jeu subsiste entre le support fixe 15 du rouleau et la surface interne de l'enveloppe 16. Le support fixe 15 est usiné de façon à constituer cinq chambres 20 de direction radiale verticale qui peuvent être alimentées en fluide hydraulique par une canalisation centrale 23 également usinée dans le support 15. Des pistons 21 sont montés glissants et étanches dans les chambres 20 et constituent avec celles-ci des vérins de maintien de l'enveloppe 16 dans direction radiale. Les pistons 21 comportent à leur extrémité dirigée vers la surface intérieure de l'enveloppe tubulaire 16 des dépressions 24 communiquant avec la chambre 20 alimentée en fluide hydraulique. Les pistons 21 permettent donc, lorsque les chambres 20 des vérins sont alimentées en fluide hydraulique, de maintenir l'enveloppe 16 dans la direction radiale et de créer un filmd'huile entre l'extrémité du piston et la surface intérieure de l'enveloppe 16. L'enveloppe 16 peut ainsi tourner autour du support fixe 15 pratiquement sans frottement.In Figure 2, we see a rolling mill cage shown in Figure 1, the upper support roller 9 has a fixed support 15 mounted in the fixed frame 14 of the cage through the ends of shafts 15a and 15b and ball joints 17a and 17b. The roller 9 also comprises a tubular casing 16 whose internal diameter is such that a clearance remains between the fixed support 15 of the roll and the internal surface of the casing 16. The fixed support 15 is machined so as to constitute five chambers 20 of vertical radial direction which can be supplied with hydraulic fluid by a central pipe 23 also machined in the support 15. Pistons 21 are mounted sliding and sealed in the chambers 20 and constitute therewith cylinders for holding the casing 16 in radial direction. The pistons 21 have, at their end directed towards the internal surface of the tubular casing 16, depressions 24 communicating with the chamber 20 supplied with hydraulic fluid. The pistons 21 therefore make it possible, when the chambers 20 of the jacks are supplied with hydraulic fluid, to maintain the casing 16 in the radial direction and to create a film of oil between the end of the piston and the interior surface of the casing 16 The envelope 16 can thus rotate around the fixed support 15 practically without friction.

L'alimentation simultanée en fluide hydraulique sous pression des chambres 20 de l'ensemble des vérins est assurée par un circuit 25 comportant des éléments électrohydrauliques de commande dont l'ouverture ou la fermeture dépend de la vapeur de la traction mesurée par le dispositif de mesure de traction 11 disposé immédiatement en amont de la cage considérée.The simultaneous supply of pressurized hydraulic fluid to the chambers 20 of all the jacks is ensured by a circuit 25 comprising elements electrohydraulic control elements, the opening or closing of which depends on the traction vapor measured by the traction measuring device 11 placed immediately upstream of the cage in question.

La valeur de la traction mesurée par le dispositif 11 est comparée à deux valeurs de consigne entre lesquelles on veut maintenir cette traction. Dans le cas où la traction sort de l'intervalle défini par les valeurs de consigne, les pistons 21 des vérins sont déplacés dans un sens ou dans l'autre, simultanément et de la même quantité, par l'intermédiaire du circuit hydraulique 25. L'ensemble des pistons 21 déplace donc l'enveloppe tubulaire 16 dans un sens ou dans l'autre sans modifier la forme de la génératrice de contact entre cette enveloppe 16 et le rouleau supérieur de travail 6. On peut ainsi modifier le serrage de la cage et donc régler la traction de la bande à l'amont de cette cage, sans modifier la forme de génératrice de contact et donc le réglage permettant d'obtenir un produit d'une parfaite planéité. Ceci est obtenu grâce à une répartition des vérins de déplacement de l'enveloppe du cylindre d'appui sur toute la longueur de ce cylindre. Les dispositifs de serrage des cages de laminoir suivant l'art antérieur n'agissaient que par l'intermédiaire des extrémités du cylindre par l'intermédiaire duquel on effectuait le réglage.The value of the traction measured by the device 11 is compared with two reference values between which it is desired to maintain this traction. In the event that the traction leaves the interval defined by the set values, the pistons 21 of the jacks are moved in one direction or the other, simultaneously and by the same amount, by means of the hydraulic circuit 25. The set of pistons 21 therefore displaces the tubular casing 16 in one direction or the other without modifying the shape of the contact generator between this casing 16 and the upper working roller 6. It is thus possible to modify the tightening of the cage and therefore adjust the traction of the strip upstream of this cage, without modifying the shape of contact generator and therefore the adjustment making it possible to obtain a product of perfect flatness. This is obtained by distributing the displacement cylinders of the envelope of the support cylinder over the entire length of this cylinder. The clamping devices of the rolling mill stands according to the prior art only acted through the ends of the cylinder through which the adjustment was carried out.

On voit sur la figure 1, que seules les cages 2, 3 et 4 comporte un sensmble de réglage de la trac-- tion dans l'inter-cage situé en amont, par déplacement de l'enveloppe du cylindre d'appui 9 en fonction de la valeur de la traction mesurée en amont par le dispositif 11 correspondant, de façon à régler la traction de la bande 5 dans les trois inter-cages du train tandem à froid.We see in Figure 1, that only the cages 2, 3 and 4 has a sensmble adjustment of the traction in the inter-cage located upstream, by displacement of the envelope of the support cylinder 9 in function of the value of the traction measured upstream by the corresponding device 11, so as to adjust the traction of the strip 5 in the three inter-cages of the cold tandem train.

En revanche, les quatre cages 1, 2, 3 et 4 comportent un ensemble permettant le réglage de la planéité et éventuellement le réglage d'épaisseur en utilisant le rouleau d'appui supérieur à enveloppe déformable. Pour cela, les déplacements des cinq vérins disposés suivant la longueur des rouleaux d'appui 9 sont commandés non plus dans leur ensemble mais séparément par un circuit de commande recevant les indications d'un rouleau de planéité 10 placé juste en aval de la cage considérée et éventuellement dans leur ensemble par un circuit de commande recevant les indications d'une jauge de mesure d'épaisseur telle que 12.On the other hand, the four cages 1, 2, 3 and 4 include an assembly allowing the adjustment of the pla born and possibly the thickness adjustment using the upper support roller with deformable envelope. For this, the movements of the five cylinders arranged along the length of the support rollers 9 are no longer controlled as a whole but separately by a control circuit receiving the indications of a flatness roller 10 placed just downstream of the cage considered and possibly as a whole by a control circuit receiving the indications of a thickness measurement gauge such as 12.

Une telle méthode de réglage d'épaisseur et de planéité a été décrite dans la demande de brevet EU-A-140 776, déjà citée de la Société CLECIN. Il est à noter que ces déplacements de l'enveloppe des cylindres 9 se superposent au déplacement dû au serrage pour la régulation de traction dans la bande. Ces déplacements des différents vérins pourrie réglage de planéité ne sont pas identique comme dans le cas du réglage de traction. D'autre part, les dispositifs de mesure d'épaisseur et de planéité sont disposés en aval de la cage sur laquelle est effectué le réglage de planéité et d'épaisseur.Such a method of adjusting thickness and flatness has been described in patent application EU-A-140,776, already cited by the company CLECIN. It should be noted that these displacements of the casing of the cylinders 9 are superimposed on the displacement due to tightening for the regulation of traction in the strip. These displacements of the various rotten cylinders adjusting the flatness are not identical as in the case of the traction adjustment. On the other hand, the thickness and flatness measurement devices are arranged downstream of the cage on which the flatness and thickness adjustment is carried out.

Les moyens de réglage de la traction d'une part et de l'épaisseur et de la planéité d'autre part sont donc bien distincts bien qu'ils fassent appel à un même rouleau d'appui à enveloppe mobile et déformable.The means for adjusting the traction on the one hand and the thickness and the flatness on the other hand are therefore very distinct although they make use of the same support roller with a movable and deformable envelope.

On pourrait d'ailleursconcevoir un train tandem à froid où les rouleaux d'appui à enveloppe mobile grâce à des vérins serviraient uniquement au réglage de la traction dans la bande.We could also design a tandem cold train where the support rollers with movable casing thanks to jacks would only be used to adjust the traction in the strip.

Les principaux avantages du laminoir suivant l'invention sont de permettre un réglage de la traction de la bande dans les inter-cages ne créant pas de défaut de planéité et d'éviter ainsi l'utilisation de moyens de cambrage des rouleaux de travail pour la correction de ces défauts de planéité.The main advantages of the rolling mill according to the invention are to allow adjustment of the tension of the strip in the inter-cages not creating a flatness defect and thus avoid the use of means for bending the working rollers for the horn rectification of these flatness defects.

L'invention ne se limite pas au mode de réalisation qui a été décrit elle en comporte au contraire toutes les variantes.The invention is not limited to the embodiment which has been described; on the contrary, it includes all the variants thereof.

C'est ainsi qu'il est possible d'imaginer l'utilisation, dans un train tandem à froid, de moyens de réglage de la traction suivant l'invention dans certaines cages seulement, les autres cages étant équipées de moyens de serrage suivant l'art antérieur. L'effet de ces dispositifs amenant des variations de profil et de planéité peut en effet s'avérer très faible ou nul dans certaines cages du train à froid mais au contraire très important dans d'autres cages.It is thus possible to imagine the use, in a cold tandem train, of means for adjusting the traction according to the invention in certain cages only, the other cages being equipped with clamping means according to the invention. prior art. The effect of these devices bringing variations in profile and flatness may indeed prove to be very weak or zero in certain cages of the cold train but on the contrary very important in other cages.

Les cages équipées de moyens de réglage de la traction suivant l'invention pourront comporter deux cylindres d'appui à enveloppes mobiles et déformables, les enveloppes de ces deux cylindres étant commandées simultanément pour leur déplacement conduisant au serrage du laminoir, à partir des indications du dispositif de mesure de traction dans l'inter-cage disposé en amont. Les rouleaux d'appui à enveloppe mobile et déformable peuvent avoir un nombre de chambres variable d'une cage à l'autre.The cages equipped with traction adjustment means according to the invention may comprise two support cylinders with movable and deformable envelopes, the envelopes of these two cylinders being controlled simultaneously for their movement leading to the clamping of the rolling mill, from the indications of the traction measurement device in the inter-cage located upstream. The support rollers with a movable and deformable envelope may have a number of chambers that vary from cage to cage.

Le laminoir tandem à froid suivant l'invention peut comporter non seulement les cages quarto comme il a été décrit mais encore des cages ayant un plus grand nombre de rouleaux, par exemple des cages sexto comportant des cylindres intermédiaires entre les cylindres d'appui et les cylindres de travail.The tandem cold rolling mill according to the invention can comprise not only the quarto cages as it has been described but also cages having a greater number of rollers, for example sexto cages comprising intermediate cylinders between the support cylinders and the working cylinders.

Dans le cas où l'on effectue sur les cages de'laminoir à la fois un réglage de traction de la bande et un réglage d'épaisseur et de planéité, les dispositifs de mesure de la traction et de la planéité disposés dans les inter-cages permettant de commander les moyens de réglage des cages peuvent être non seulement distincts comme dans l'exemple de réalisation qui à été décrit mais également confondus.In the case where the tension of the strip and a thickness and flatness adjustment are carried out on the roller cages, the devices for measuring the traction and the flatness arranged in the inter- cages for controlling the means for adjusting the cages can be not only distinct as in the embodiment which was described but also confused.

On peut par exemple utiliser un seul rouleau de mesure de planéité disposé dans chacun des inter-ca- ges qui mesure la répartition transversale de la traction dans la bande.One can for example use one flatness measuring roller disposed in each of the intra-ca- g es which measures the transverse distribution of tension in the band.

Un tel rouleau peut être constitué d'une série de sections placées les unes à la suite des autres et qui, pour apprécier les défauts de planéité, mesurent la valeur de la traction en différents endroits répartis sur la largeur de la bande.Such a roller can consist of a series of sections placed one after the other and which, in order to assess the flatness defects, measure the value of the traction in different places distributed over the width of the strip.

Selon une autre caractéristique supplémentaire de l'invention, les mesures obtenues à partir de ce rouleau de planéité servent d'une part à commander individuellement les déplacements des vérins du rouleau d'appui à enveloppe déformable disposés en amont du rouleau de planéité et d'autre part à commander des déplacements identiques des vérins du rouleau à enveloppe mobile et déformable de la cage disposée en aval du rouleau de planéité. Pour commander les déplacements permettant le réglage de traciton, par serrage de la cage disposée en aval du rouleau de planéité, on élabore un signal représentatif d'une traction moyenne dans la bande obtenu à partir des indications des différentes sections du rouleau de mesure de planéité.According to another additional characteristic of the invention, the measurements obtained from this flatness roller serve on the one hand to individually control the displacements of the cylinders of the support roller with deformable casing arranged upstream of the flatness roller and on the other hand to control identical movements of the cylinders of the roller with a movable and deformable envelope of the cage disposed downstream of the flatness roller. To control the displacements allowing the adjustment of traciton, by tightening of the cage arranged downstream of the flatness roller, a signal representative of an average traction in the strip is produced, obtained from the indications of the different sections of the flatness measuring roller. .

Dans tous les cas cependant, la commande des moyens de réglage de planéité et la commande des moyens de réglage de la traction restent distinctes, même si les moyens de mesure disposés entre les cages et les moyens d'actionnement disposés dans les cages sont communs.In all cases, however, the control of the flatness adjustment means and the control of the traction adjustment means remain separate, even if the measurement means disposed between the cages and the actuation means disposed in the cages are common.

Le laminoir tandem suivant l'invention peut être utilisé pour le laminage à froid de tout produit plat sous forme de bande qui passe d'une cage à l'autre en restant parfaitement tendu dans les espaces inter-caqes.The tandem rolling mill according to the invention can be used for the cold rolling of all web-like flat product which passes from one cage to another remaining perfectly stretched in inter-ca q are spaces.

L'invention s'applique également à tout lami- tandem à chaud dont le mode de contrôle serait identique à celui d'un laminoir tandem à froid, en ce qui concerne la traction du produit en cours de laminage.The invention also applies to any lami- hot tandem, the control mode of which would be identical to that of a cold tandem rolling mill, as regards the traction of the product during rolling.

Claims (6)

1.Laminoir tandem pour produits plats sous forme de bande, comportant une pluralité de cages (1,2,3,4)disposées l'une à la suite de l'autre et comportant chacune un bâti fixe (14)dans lequel 1 sont montés deux cylindres de travail(6,7) entre lesquels passe le produit plat (5) en cours de laminage et au moins deux cylindres d'appui, respectivement supérieur (9) et inférieur (8),chacun de l'un des cylindres de travail (6,7),au moins un dispositif de mesure (11)de la traction dans le produit plat (5),disposé au moins dans l'espace inter-cages situé entre l'avant-dernière cage du laminoir et la cage précédente, l'un au moins des cylindres d'appui(9) d'au moins l'avant dernière cage, comprenant un support fixe (15)monté dans le bâti (14)de la cage, une enveloppe tubulaire (16)montée rotative autour du support fixe (15) et en contact avec le cylindre de travail correspondant(6) suivant une de ses génératrices et sur toute sa longueur une pluralité de patins de maintien (20,21) mobiles radialement entre le support fixe (15)et l'enveloppe tubulaire (16) sous l'action de vérins hydrauliques et comportant chacun une chambre de vérin (20)ménagée dans le support fixe (15)et un piston (2)monté glissant dans la chambre (20) et s'appuyant sur le patin, ce dernier comportant sur sa face tournée vers la surface intérieure de l'enveloppe (16)un moyen (24) de formation d'un film d'huile permettant la rotation de l'enveloppe (16),les chambres (20)des vérins des patins de maintien étant reliées à un circuit commun (25) d'alimentation en fluide sous pression dont l'ouverture ou la fermeture sont commandées par le dispositif de mesure (11) en fonction de la traction mesurée dans l'espace inter-cages situé juste en amont de façon à modifier le serrage de la cage pour régler la traction de la bande sans modifier la forme de la génératrice de contact,par déplacement simultanée et de la même quantité de l'ensemble des patins de maintien .1.Tandem rolling mill for flat products in the form of a strip, comprising a plurality of cages (1,2,3,4) arranged one after the other and each comprising a fixed frame (14) in which 1 are mounted two working rolls (6,7) between which the flat product (5) passes during rolling and at least two supporting rolls, respectively upper (9) and lower (8), each of one of the rolls working (6,7), at least one device (11) for measuring the traction in the flat product (5), arranged at least in the inter-cage space situated between the penultimate stand of the rolling mill and the previous cage, at least one of the support cylinders (9) of at least the penultimate cage, comprising a fixed support (15) mounted in the frame (14) of the cage, a tubular envelope (16) rotatably mounted around the fixed support (15) and in contact with the corresponding working cylinder (6) along one of its generatrices and over its entire length a plurality of retaining pads (20, 21) movable radially ement between the fixed support (15) and the tubular casing (16) under the action of hydraulic cylinders and each comprising a cylinder chamber (20) formed in the fixed support (15) and a piston (2) mounted sliding in the chamber (20) and resting on the pad, the latter comprising on its face facing the inner surface of the envelope (16) means (24) for forming an oil film allowing the rotation of the envelope (16), the chambers (20) of the cylinders of the holding pads being connected to a common circuit (25) for supplying pressurized fluid, the opening or closing of which are controlled by the measuring device (11) as a function of the traction measured in the inter-cage space situated just upstream so as to modify the tightening of the cage in order to adjust the traction of the strip without modifying the shape of the contact generator, by simultaneous displacement and of the same quantity of the set of holding pads. 2.Laminoir tandem suivant la revendication 1, caractérisé en ce que les deux cylindres d'appui, respectivement supérieur(9)et inférieur(8) en contact avec les deux cylindres d'appui,respectivement supérieur (9)et inférieur (8) en contact avec les deux rouleaux de travail (6,7)sont des cylindres à enveloppe mobile et déformable,dont l'enveloppe mobile (16)est maintenue dans la direction radiale par des patins susceptibles d'être déplacés simultanément et d'une même quantité sous l'action de vérins hydrauliques (20,21) commandés par un circuit hydraulique commun (25), en fonction des indications d'un dispositif de mesure de traction (11) de la bande (5) placé dans l'espace inter-cage disposé immédiatement en amont de la cage considérée .2.Tandem rolling mill according to claim 1, characterized in that the two support cylinders, respectively upper (9) and lower (8) in contact with the two support cylinders, respectively upper (9) and lower (8) in contact with the two working rollers (6,7) are cylinders with movable and deformable casing, the movable casing (16) of which is held in the direction radial by pads capable of being moved simultaneously and by the same amount under the action of hydraulic cylinders (20,21) controlled by a common hydraulic circuit (25), according to the indications of a traction measuring device (11) of the strip (5) placed in the inter-cage space disposed immediately upstream of the cage in question. 3.Laminoir tandem suivant la revendication l,caractérisé en ce que chacune des cages (1,2,3,4) équipée d'au moins un cylindre d'appui (9) à enveloppe mobile et déformable pour le réglage de la traction,dans l'espace inter-cages située juste en amont et associée à un dispositif (10) de mesure de la planéité du produit (5) dans l'espace inter-cages situé juste en aval pour la correction de la planéité, les pistons (21)des vérins des patins de maintien de l'enveloppe (16)étant commandés individuellement par un circuit hydraulique,en fonction des indications du dispositif de mesure de planéité (LO)disposé dans l'inter-cage placée immédiatement en aval de la cage considérée .3.Tandem rolling mill according to claim l, characterized in that each of the cages (1,2,3,4) equipped with at least one support cylinder (9) with a movable and deformable casing for adjusting the traction, in the inter-cage space located just upstream and associated with a device (10) for measuring the flatness of the product (5) in the inter-cage space located just downstream for the correction of flatness, the pistons ( 21) cylinders of the envelope holding pads (16) being individually controlled by a hydraulic circuit, according to the indications of the flatness measuring device (LO) disposed in the inter-cage placed immediately downstream of the cage considered. 4.Laminoir tandem suivant la revendication 3,caractérisé par le fait que le dispositif de mesure de traction (11) dans l'un au moins des inter-cages est constitué par un rouleau de mesure de planéité permettant de déterminer la valeur de la traction dans la bande en différents endroits de sa largeur, le cylindre d'appui (9)à enveloppe déformable (16) de la cage disposée immédiatement en aval du rouleau de planéité étant commandé en fonction d'une valeur moyenne de la traction,des valeurs de la traction mesurées par le rouleau de planéité.4.Tandem rolling mill according to claim 3, characterized in that the traction measuring device (11) in at least one of the inter-cages is constituted by a flatness measuring roller making it possible to determine the value of the traction in the strip in different places of its width, the support cylinder (9) with a deformable envelope (16) of the cage disposed immediately downstream of the flatness roller being controlled as a function of an average value of the traction, values of the traction measured by the flatness roller. 5.Laminoir tandem suivant l'une des revendications précédentes, caractérisé en ce que chacune des cages (1,2,3,4) du laminoir est équipé d'au moins un cylindre d'appui (90,96)à enveloppe mobile et déformable(16)que des dispositifs de mesure de tension (11a, 11b, 11c...)et de mesure de planéité (10a, 10b)sont placés dans chacun des espaces inter-cages et un dispositif de mesure de planéité (10d) à la sortie du laminoir et que les déplacements des patins de maintien des cylindres d'appui à enveloppe mobile et déformable (16)de l'ensemble des cages à l'exception de la première sont commandés à partir des indications fournies simultanément par les dispositifs de mesure de tension (11) et de planéité (IO)placés respectivement en amont et en aval de la cage considérée,le cylindre d'appui (9a)de la première cage étant commandé par un dispositif de mesure de planéité (10)et par un dispositif de mesure d'épaisseur (12)placé en aval de lui.5.Tandem rolling mill according to one of the preceding claims, characterized in that each of the stands (1,2,3,4) of the rolling mill is equipped with at least one support cylinder (90,96) with a movable envelope and deformable (16) that tension measuring devices (11a, 11b, 11c ...) and flatness measuring devices (10a, 10b) are placed in each of the inter-cage spaces and a flatness measuring device (10d) at the exit of the rolling mill and that the movements of the holding pads of the support cylinders with movable and deformable casing (16) of all the cages except the first are controlled from the indications provided simultaneously by the devices for measuring tension (11) and flatness (IO) placed respectively upstream and downstream of the cage considered, the support cylinder (9a) of the first cage being controlled by a flatness measurement device (10) and by a thickness measuring device (12) placed downstream of it. 6.Laminoir tandem selon l'une des revendications 4 et 5,caractérisé en ce que le dispositif de mesure de tension (11) et de mesure de planéité (IO)placés dans un même espace inter-cages sont constitués par un seul rouleau de planéité susceptible de déterminer la valeur de la traction de la bande en différents endroits de sa largeur.6.Tandem rolling mill according to one of claims 4 and 5, characterized in that the tension measurement device (11) and flatness measurement (IO) placed in the same inter-cage space consist of a single roller flatness capable of determining the value of the traction of the strip in different places of its width.
EP85401814A 1984-09-21 1985-09-18 Tandem rolling mill for flat rolling stock Withdrawn EP0175621A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8414503 1984-09-21
FR8414503A FR2570623B1 (en) 1984-09-21 1984-09-21 TANDEM ROLLER FOR FLAT PRODUCTS

Publications (1)

Publication Number Publication Date
EP0175621A1 true EP0175621A1 (en) 1986-03-26

Family

ID=9307930

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85401814A Withdrawn EP0175621A1 (en) 1984-09-21 1985-09-18 Tandem rolling mill for flat rolling stock

Country Status (2)

Country Link
EP (1) EP0175621A1 (en)
FR (1) FR2570623B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102172629A (en) * 2011-01-29 2011-09-07 首钢总公司 Roll profile control method for CVC-6 leveling machine set
CN102266870A (en) * 2011-07-14 2011-12-07 莱芜钢铁集团有限公司 Method for starting finishing mill set of broad hot strips

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2360713A1 (en) * 1975-12-08 1978-03-03 Escher Wyss Sa METHOD AND DEVICE FOR ADJUSTING THE TIGHTENING FORCE OF A ROLLER
US4286447A (en) * 1979-03-12 1981-09-01 Westinghouse Electric Corp. Method and apparatus for automatic gauge control system for tandem rolling mills
EP0140776A2 (en) * 1983-10-14 1985-05-08 Clecim Thickness and contour regulating method for a flat rolled product during rolling

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2360713A1 (en) * 1975-12-08 1978-03-03 Escher Wyss Sa METHOD AND DEVICE FOR ADJUSTING THE TIGHTENING FORCE OF A ROLLER
US4286447A (en) * 1979-03-12 1981-09-01 Westinghouse Electric Corp. Method and apparatus for automatic gauge control system for tandem rolling mills
EP0140776A2 (en) * 1983-10-14 1985-05-08 Clecim Thickness and contour regulating method for a flat rolled product during rolling

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102172629A (en) * 2011-01-29 2011-09-07 首钢总公司 Roll profile control method for CVC-6 leveling machine set
CN102172629B (en) * 2011-01-29 2012-07-25 首钢总公司 Roll profile control method for CVC-6 leveling machine set
CN102266870A (en) * 2011-07-14 2011-12-07 莱芜钢铁集团有限公司 Method for starting finishing mill set of broad hot strips

Also Published As

Publication number Publication date
FR2570623B1 (en) 1987-04-10
FR2570623A1 (en) 1986-03-28

Similar Documents

Publication Publication Date Title
EP0140776B1 (en) Thickness and contour regulating method for a flat rolled product during rolling
EP1601474B1 (en) Method for changing the configuration of a rolling mill and advanced rolling mill for carrying out said method
EP1560667A1 (en) Method for increasing the range of production of a metal product rolling installation and installation therefor
EP0286533B1 (en) Metal strip or sheet-rolling method and installation
FR2502990A1 (en) MULTI-LEVEL ROLLER WITH MECHANISM FOR ADJUSTING THE FLATTENING OF THE ROLLED PRODUCT
FR2569583A1 (en) ROLLER CAGE FOR A LAMINATED MATERIAL
FR2803548A1 (en) METHOD AND DEVICE FOR THERMALLY CONTROLLING THE PROFILE OF A CYLINDER IN A ROLLER
FR2853570A1 (en) METHOD AND DEVICE FOR REGULATING THE THICKNESS OF A LAMINATED PRODUCT
EP0225827B1 (en) Rotary cylinder ferrule
EP0707902B1 (en) Rolling installation
EP0175621A1 (en) Tandem rolling mill for flat rolling stock
EP1552892B1 (en) Machine for straightening metal bands
EP0649686A1 (en) Rolling mill with axially shifting rolls
EP0975447B1 (en) Rolling installation for flat products
EP0238377A1 (en) Roll bending control in a rolling mill with axially shiftable rolls
BE550693A (en)
EP0493171B1 (en) Equipment for rolling flat products
FR2771809A1 (en) APPARATUS FOR MEASURING THE PLANEITY OF A RUNNING WEB
FR2786415A1 (en) ROLLER EQUIPPED WITH WORKING CYLINDER BENDING MEANS
EP0225198A1 (en) Apparatus for stretch-levelling metal strip
EP1226886B1 (en) System for driving and guiding a metal band
FR2537021A1 (en) Six-high rolling mill stand
FR2595275A1 (en) DEVICE FOR ADJUSTING THE PLANEITE AND THE THICKNESS OF THE LAMINATED FOIL IN A MULTI-CYLINDER LAMINATION ROLLER CAGE
EP1044736B1 (en) Rolling mill with hydraulic adjustment
FR2640891A1 (en)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE GB IT

17P Request for examination filed

Effective date: 19860715

17Q First examination report despatched

Effective date: 19870924

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19880510

RIN1 Information on inventor provided before grant (corrected)

Inventor name: LECLERCQ, YVES

Inventor name: MOREL, MICHEL

Inventor name: VALENCE, MARC