EP2542360A1

EP2542360A1 - Roll stand

Info

Publication number: EP2542360A1
Application number: EP10720276A
Authority: EP
Inventors: Bernard Rossigneux; Yves Guillot; Francis Charre
Original assignee: Siemens VAI Metals Technologies SAS
Current assignee: Clecim SAS
Priority date: 2010-03-03
Filing date: 2010-04-01
Publication date: 2013-01-09
Anticipated expiration: 2030-04-01
Also published as: US20120324973A1; BR112012021676A2; CN102781599B; EP2542360B1; WO2011107165A1; BR112012021676B1; KR20130028899A; US8991231B2; CN102781599A; KR101591563B1

Abstract

The present invention relates to a roll stand, including two working rollers (1) capable of surrounding a strip to be rolled, two intermediate rollers (2), two bearing rollers (3), and at least one side bearing member (7) capable of laterally supporting said working roller (1); the invention also relates to a method for operating a roll stand, said roll stand being characterized in that at least one camber block (9) for cambering said intermediate rollers (2) is capable of vertical movement relative to the posts (6) of the roll stand and of supporting said side bearing member (7).

Description

Roll stand The present invention relates to a rolling stand suscepti ^¬ ble to equip a rolling installation, according to the preambles of claims 1 and 15.

The present invention particularly relates to the field of rolling metal strips, in particular steels spe cial ^¬ such as stainless steels, with a settled ^¬ rolling generally comprising at least one rolling stand. More particularly, the present invention relates to a rolling stand of said washing plant and its operation, said cage being intended for rolling any type of metal, and in particular for rolling stainless steels.

Conventionally, a roll stand is equipped with two superimposed cyclic lindres working vertically, each having its longitudinal axis of rotation parallel to challenge plan ^¬ LEMENT of the metal strip and placed in the same clamping plane substantially perpendicular to the direction of def ^{¬ tion} of the band between said working rolls. During rolling, the working rolls are generally pres ^¬ against each other by a pair of support rollers each having their longitudinal axis in said same clamping plane (or in the vicinity of said clamping plane), and between which is applied a pressure - or a force - of rolling. Such a rolling plant comprising a rolling stand formed of four vertically superposed cylinders ^¬ ment, or two small diameter working rolls pres ^¬ ss against each other by two larger diameter bearing rolls, carries the name of "quarto". If another support cylinder, hereinafter referred to as an intermediate cylinder, is interposed between each of the pairs formed by the working roll and the support roll located on the same side of the strip to be rolled, the roll stand is then formed of six cylinders superimposed vertically one above the other. , ie a pair of working rolls enclosing the strip to be rolled, framed by a first pair of rolls formed by the intermediate rolls, themselves framed by a second pair of rolls formed by the support rolls. A rolling mill or rolling mill characterized by such a cylinder arrangement is usually ^de¬ signed under the name of "sexto" or "6-High". Finally, a roll stand of a sexto-type rolling mill may comprise lateral supports of the working rolls. In particular, each of the working cylinders is in contact on both sides of the clamping plane with a lateral support member, comprising for example a lateral support cylinder itself supported laterally by two rows of support rollers. side mounted side by side. The sexto rolling mills comprising said lateral support members are generally referred to as laterally supported sexto-type rolling mills. In all cases, the cylinders are supported each on or against the other along substantially parallel bearing lines and directed along a generatrix whose profile, normal straight ^¬ ment depends applied effort and the resistance of cylinders.

Laterally supported sexto-type rolling stands are known to those skilled in the art and are in particular subject to US Pat. Nos. 4,270,377 and 4,531,394. The justification for this particular arrangement of the various cylinders and rollers lies in the adaptation of the diameter of the working rolls to the resistance to plastic flow of the metal to be rolled. Indeed, large work rolls Diame ^¬ tres, such as equipping the quarto type cages, turn induce, reduction of thickness, an arc of important contacts both with the band and therefore a greater rolling force with smaller diameter cylinders. For steels having a moderate resistance to plastic flow, it is preferred quarto type rolling mills whose large working rollers facilitate the sta ^¬ bility of the rolling operation and which wear out less quickly. But for some steels such as stainless steels and other high strength steels, the choice of small diameter cylin ^¬ ders work is needed to maintain reasonable rolling forces. For this reason, the six-high type mills having small diameter work rolls are implemented, and when the hardness of the metal to be rolled disclosures, one is led to use cy ^¬ working lindres very small diameter which poses bending problems during rolling.

Indeed, the diameter of these working rolls is such that it is impossible to drive them directly, as is usual for cylinders of larger diameter, for example using extensions transmitting to one of their extremi ^¬ tés the rolling torque from a motorcycle gear reduction unit. The transmission of the torque is then ensured, in the case of these small diameter working rolls, by friction on the intermediate rolls which are themselves driven by a gear motor assembly. This transmission by friction generates between the working cylinder and the cylinder ^¬ dre intermediate a tangential force proportional to the cou ^¬ ple transmitted. In the case of cylinders of very low DIAME ^¬ be, this tangential force causes a longitudinal bending of the work roll, leading to the rolled strip flatness.

In order to avoid this harmful flexion, and as described in US Pat. Nos. 4,270,377 and 4,531,394, each working cylinder is supported, at least on the inlet side of the band in the grip of the working cylinders, by a cylinder ^¬ dre lateral support, itself supported by two rows of rollers, lateral support cylinder and rollers being fixed on support arms whose position is adjustable to s' adapt to different diameters of new or worn work rolls. Generally, each of the working rolls is laterally supported by a pair of cylinders sou ^¬ lateral tien located on either side of the clamping plane, each of them being supported by said two ga- lets rows.

US Patent 4, 270, 377 describes for example a cage lami ^¬ swimming comprising two work rolls each of which is sup ^¬ carried on the one hand vertically by an intermediate cylinder itself supported by a support cylinder, and also on the other hand, laterally by two cylinders of support ^¬ téral supported themselves by two rows of sou ^¬ tin rollers. In the embodiment disclosed by the patent above ^¬ mentioned, the work rolls are not supported and held in place by chocks, but are simply held axially by two axial stops roller. In addition, each lateral support cylinder and its two rows of rollers are carried by a support arm hinged to a chock of the support roll and have a radial displacement member relative to the working roll. The shells of the intermediate rolls are furthermore equipped with jacks intended to provide a camber for said working rolls. They are also equipped with special bearings without inner ring and with cylindrical rollers, which allow the intermediate cylinders to move axially under the action of an axial displacement member mounted in one of the two chocks of each intermediate cylinder. Said ^¬ axial placement corresponds to a displacement of said intermediate cylinder along its longitudinal axis of rotation. Camming and axial displacement of the intermediate cylinders being, in known manner, used to improve the flatness of the rolled metal strips.

The very small diameter of the work rolls imposes very reduced values of diameters of cylinders intermédiai ^¬ res. US Patent 4,270,377 mentions, for example an intermediate roll of 6-inch diameter to a cylinder tra ^¬ 2.25 inches vail. It follows that the chocks of the intermediate ^¬ cylin ders are of reduced dimensions, which complicates the choice of a bearing capable of supporting the char ges ^¬ service and to ensure, at the same time, a relative sliding to the trunnion of the intermediate cylinder.

An improvement of a rolling stand as described in US Pat. No. 4,270,377 is disclosed in US Pat. Nos. 4,531,394 and EP 0,937,517. The latter describe a rolling stand for which each lateral support cylinder and its two rows of rollers are carried by an articulated support arm on the chock of the intermediate cylinder. EP 0937517 further discloses a tape comprising a cy ^¬ lindre intermediate its chocks and two lateral supporting rollers respectively supported by two rows of rollers. In this case, an axial displacement system by means of hydraulic cylinders allows axial movement of the intermediate cylinder. Each intermediate roll comprises two cylindrical roller bearings without inner ring my ^¬ tees in both chocks and wherein its journals little wind ^¬ slide axially. Finally, a third chock comprises an axially fixed bearing assembly on the end of the intermediate cylinder and which, both as sour ^¬ the taking up axial forces and transmitting the soft ^¬ vely axially to the intermediate cylinder.

The type of installation described above, and mounting variants of the intermediate cylinders and lateral support in cartridge derived therefrom such as that described in WO 2004/052568, have a number of drawbacks, including the joining-related disadvantages of cy ^¬ lindres lateral support and two rows of rollers with the chocks of the intermediate rolls or cylin ^¬ support dres. This results in particular a complication of the operations of extraction of the intermediate rolls out of the roll stand, as well as a complication of their re ^¬ conditioning by rectification of their active surface.

According to a widespread and proven technique, Cy ^¬ lindres intermediates can be corrected with their poise em ^¬ already assembled, which has the advantage of avoiding unnecessary disassembly times. In the case of intermediates cylinders integral res their lateral bearing members (ie each lateral support member, for example comprising a lateral support roller and support rollers, is secured to the cy ^¬ lindre intermediate, or a support of said cylinder ^¬ interme diary, e.g. chocks of said cylinder intermediary), the correction of the intermediate rolls with their chocks yet mounted becomes impossible and ^¬ conse quence, it is necessary to dismantle all fitted out ^¬ ges formed of the intermediate cylinder and its lateral support members at each grinding.

On the other hand all handling of said crews ^¬ require, particularly when it comes to return, specific tools preventing inadvertent ^¬ tive and dangerous movements of support rollers and side support rollers.

Finally, it is necessary to park as many crews com ^¬ plets that there are intermediate cylinders to ensure a rotation of said crews without loss of time between the assembly phase of the crew in rolling cage and the maintenance phase of the crew in the workshop. This results in an increased cost of the park spare parts ^¬ ope rational, in particular, different crews, and an increase in a time of rotation between said assembly and maintenance phases resulting in particular from the need to disassemble all the constituent parts of the crews.

Another disadvantage results from the operating mode of the previously described rolling stands. According to a first mode of operation as that described in WO 2004/052568, the axial shifting of the rolls intermédiai ^¬ res is provided by axial sliding of the chocks, which in ^¬ son relative movement of the side support members relative the working cylinders with creation of axial thrusts able on the one hand to damage the axial stops of said work rolls, and on the other hand, to degrade the surface of said work rolls by friction on the lateral support members. In addition, according to a second mode of operation of rolling stands described in the ante ^¬ laughing art, particularly by US 4270377, the axial displacement of the intermediate rolls is provided by axial sliding of their trunnions with respect to their chocks and therefore, compared to their bearings. This operating mode has the advantage of maintaining the chocks of the intermediate rolls axially fixed and prevent movement of the organs of lateral support attached thereto relative to the work rolls during axial displacement of the cylin ders ^¬ intermediate, however, this second mode of operation has many disadvantages.

In particular, the choice of bearings without inner race, ca ^¬ ractérisés by rolling cylindrical rollers directly on the journals of the intermediate rolls, impose particularly hard and difficult to achieve trunnions. On the other hand, said pins have a high risk of service damage by wear or spalling under the pressure of cylindrical roller with a decrease Corré ^¬ lative to the lifetime of the intermediate rolls. In addition, it is very difficult to ensure a good seal of such bearings, which can lead to the use of rolling fluids, such as mineral oil, compatible with lubrication and the absence of corrosion of rolls ^¬ while other fluids, such as emulsions, would be more suitable for the needs of rolling. ^Finally , the intermediate cylinders must on the other hand be extended by the axial displacement distance of the cylinder in ^¬ intermediate, which increases the cost of supply of the fleet of intermediate cylinders. On the other hand, such cages sometimes require the use of a third printer. This third chock, equipped with assemblies rou ^¬ Elements e able to take axial forces, generates additional costs resulting from the need for more long cylinders and the chocks and additional bearings.

In order to solve these problems, another configuration of a rolling stand has been proposed, characterized in particular by a joining of the lateral support rollers and their two rows of rollers, no longer with the chocks of the intermediate rolls or the rolls of the rollers. support, but with the amounts of the rolling stand. Such a configuration is in particular described in patents WO 01/21334 or WO 2004/041456 of the applicant. In this configuration, the intermediate rolls can be easily extracted from the rolling stand and maintenance can be carried out conventionally, ie without special tools and without de ^¬ mounting chocks of the intermediate rolls. However, it also has certain disadvantages in terms of the kinematics of the rolling stand. A first drawback is interference between the cylin ^¬ dre working and two lateral supporting rollers of the side support members at an opening in the roll stand and the consequent vertical movement of the work rolls. Indeed, the general arrangement of the work rolls and lateral support that in working position, the rotational axes persons seeking lateral supporting rollers ^¬ laughing are located above the axis of rotation of the work roll higher and the distance between the two cylin ders ^¬ lateral support when they are in contact with the cylin ^¬ dre work, does not allow passage of the cylinder tra ^¬ vail upwards, ie towards the cylinder of support su ^¬ périeur. The term "superior" refers to rolls or rolling mill devices located above the plane of travel of the strip to be rolled, as opposed to "lower" which qualifies rolls or roll stand members located at below the scrolling plane of the strip to be rolled. Any vertical upward movement of the upper working cylinder can thus be hampered by the presence of the two upper lateral support cylinders which do not accompany the vertical movement of the upper work roll. Or, conversely, said vertical movement can be done with lateral support cylinders too far apart not ensuring the lateral stability of the working cylinder. The situation is reversed for cylinder tra ^¬ vail and lower lateral support, ie located below the strip running plane in the grip of the cylin ders ^¬ working.

Before any vertical movement of the work rolls, it is therefore necessary for the two lateral support rollers to be swept away from the work roll by a sufficient distance so as not to hinder a vertical displacement of the work roll, while guaranteeing a stable side of said working cylinder. This separation is achieved either by an operator, which is not reliable or automatically, which is not guaranteed in case of Grid fault ^¬ tioning of installing la- mining control to ensure this automatic .

A second drawback is interference between the work roll and the two lateral support cylinder orga ^¬ nes of lateral support during closing of the cage and the consequent vertical movement of the work rolls. The interference between the work roll and the lateral supporting rollers results for example from a bad position ^¬ ment of the lateral supporting rollers when ^¬ mainte nance of the roll stand by an operator (position of the side support rolls too close to the position of the working cylinder) or the installation of a new working cylinder whose diameter is greater than the diameter of the working cylinder which has been replaced, or a malfunction of the working cage. rolling or cylinder positioning errors. In any case, there will be interference between the working cylinder and the lateral support cylinders when closing the rolling stand.

Finally, a third drawback is a possible interference between the intermediate roll and the lateral supporting rollers when com ^¬ Mande system malfunctions.

An object of the present invention is to provide a rolling stand and a method of operating a cage lami ^¬ swim to solve the aforementioned problems. In particular, it proposes to provide a laterally supported sexto-type rolling stand, comprising intermediate rollers able to be moved axially, ie along their longitudinal axis of rotation, and to be subjected to ef- strong bending applied by blocks of bending, and which would allow:

- to prevent axial relative movements between the cylin ders ^¬ working and organs of lateral supports du- rant axial displacement operations of the intermediate rolls, and thus to avoid axial forces on the thrust bearings of the work rolls and ^¬ surface of gradations of said cylinders;

to avoid interference between working rolls, lateral support members and intermediate rolls, said interferences being associated with the vertical displacements of the working rolls and the lateral support rolls during the opening phases of the roll stand in waiting and closing position in working position.

For this purpose, a rolling stand and a method of operating a ^roll stand are provided by the contents of claims 1 and 15. A set of subclaims also has advantages of

The invention.

From a rolling stand of a strip to be rolled, said rolling stand comprising two working rolls capable of clamping said strip to be rolled, more specifically, a roll ^¬ of higher working located above a plane of scrolls ^¬ of the strip to be rolled, and NCI working cylinder ^¬ laughing located below said web running plan to be rolled, the upper and lower work rolls having their longitudinal axes of rotation in a clamping plane substantially perpendicular to the strip running plane in rolling, two intermediate rolls, respecti vely ^¬ an upper intermediate roll adapted to be in contact with the upper work roll and a lower intermediate roll adapted to be in contact with the cylin- lower working dre, two bearing cylinders, respectively ^¬ a upper support cylinder adapted to be in contact with the upper intermediate cylinder, and a lower bearing cylinder adapted to be in contact with the lower intermediate cylinder , the upper backup rolls and in ^¬ férieur being adapted to transmit a clamping force to cy ^¬ working lindres through the interme diate ^¬ cylinder, or in other words, the roll stand includes six vertically superimposed rollers according to configuration of rolling cage sexto, further comprising at least one side support ^¬ gane adapted to laterally support one of said working rolls, in particular a first and a second upper lateral support member respectively located on the side and side other of said clamping plane and able to support said upper working roll, and a first and a second lower both sides of said clamping plane and adapted to support lateral ^¬ the lower work roll, the rolling stand according to the invention is characterized in that it comprises at least a bending block for bending the said cylin ^¬ intermediate, said bending block being adapted to be moved vertically relative to the amounts of the rolling stand and to support said lateral support member. From a method of operating a cage lami ^¬ swimming of a strip to be rolled, said compre rolling stand ^¬ ing two work rolls adapted to enclose said rolled strip, two intermediate rolls, two rolls of support, or in other words six cylinders stacked vertically in a six-high rolling stand configuration, com ^¬ further taking at least a lateral support member adapted to laterally support one of said working rolls, the mé ^¬ operating method of the roll stand according to one inven ^¬ is characterized by an adjustable positioning of the body lateral support enabling: First, a fixed holding the support member laté ^¬ ral relative to the working cylinder adapted to be sou ^¬ held by said body lateral support during a MOVE ^¬ cement axial intermediate cylinder, said intermediate cylinder being able to be in contact with said working cylinder adapted to be supported by said lateral support member;

secondly, a fixed support of the lateral support member ^¬ ral with respect to the intermediate cylinder during its vertical movements, said intermediate cylinder being adapted to be in contact with the working cylinder adapted to be supported by said support member lateral;

and thirdly, a fixed support of the lateral support member with respect to the rolling stand during a de¬ ^¬ assembly of said intermediate rolls.

The roll stand comprises in particular at least two uprights adapted to provide vertical guidance of the support rolls and intermediate rolls, said two my ^¬ tants being especially not for supporting direc ^¬ or indirectly the intermediate rolls and / or organs of lateral supports, but only to guide the supporting rolls and the intermediate rolls in a substantially vertical plane (ie substantially per ^¬ pendiculaire to the strip running plane).

In addition, said block bending of the roll stand according to the invention in particular comprises a guide device secured to said bending unit, and adapted to support and mistletoe ^¬ der said lateral support member. In particular, each of the bending blocks of said rolling stand is able to com ^¬ take said guiding device adapted to guide and serve as a support for at least one of said lateral support members, so that, for example, bending blocks supporting a same lateral support member each comprise said disposi ^¬ tif guide, the latter being adapted to guide and support for example a support arm of said lateral support member. In addition, the guiding device according to the invention allows in particular a pivoting about an axis of rotation of said guide device, or a sliding according to a path pre ^¬ defined by said guide device, said lateral support member. Thus, said lateral support member is particulu ^¬ link able to pivot about an axis of rotation of said guide device integral with said camber block, or glis ^¬ ser in a path defined by the guide device. In addition, each bending block of the rolling stand according to the invention is able to support at least one chock of an intermediate roll, and an axial displacement thereof. In particular, it is not only suitable for supporting said chock, but it is also intended to support an axial displacement, for example by sliding, of said chock. Furthermore, the roll stand is in particular advantageous ^¬ characterized by actuators capable of vertically moving said bending block. Indeed, each bending block of the rolling stand 1 according to the invention is in particular adapted to be moved vertically by means of at least one of said actuators. According to a particular configuration, eight blocks bending separated from each ^¬ tres, for example blocks of hydraulic cambering are ap ^¬ your to support the chocks of the intermediate rolls su ^¬ périeur and lower, respectively four blocks of higher bending suitable for support the chocks of the cylinder inter ^¬ médiaire upper and lower four blocks bending ap ^¬ your supporting the chocks of the intermediate cylinder NCI ^¬ Procedure. Of the four upper bending blocks, two bending blocks located at one end of the intermediate roll, on either side of said clamping plane, are suitable to serve as support for a chock of said intermediate cylinder ^¬ diaire, and the other two bending blocks located at the other end of said intermediate cylinder, on either side of said clamping plane, are able to serve as a support for another chock of said intermediate cylinder. So simi lar ^¬, the four blocks of lower cambrages are adapted to serve as a support, in pairs of two blocks of bending, cha ^¬ cun a chock of the lower intermediate roll. The eight bending blocks are advantageously vertically displaceable with respect to the roll stands, synchronized in groups of four, in particular a first group of four synchronized upper blocks and a second group of four synchronized lower blocks. vertically movable, synchronously, by means of at least one actuator, for example a mechanical or hydraulic actuator, in particular adapted to be disposed between an upper bending block and a lower bending block. Thus, at least one actuator is advantageously able to vertically move an upper bending block with respect to a lower bending block, said upper and lower bending blocks being arranged on both sides of the tape running plane and close. at the same end of a working cylinder. According to an advantageous characteristic of the roll stand according to the invention, each intermediate roll chock comprises two protuberances for particular neck ^¬ smooth axially with slight play in the chock guide housings arranged in each of blocks cam- brage. Said protuberances are for example each located on a side face of the chock so that the latter is able to be supported by the bending blocks located on either side of the clamping plane. Advantageously, the ^¬ said protuberances are adapted to make the chock slidable chocks in said guide housing blocks bending in a direction parallel to the longitudinal axis of rotation of the intermediate cylinder. In particular, axial displacement members are able to axially move said intermediate cylinders by displacement of the chocks of said intermediate rolls with respect to the bending blocks. Thus, the rolling stand according to the invention is characterized by a device for carrying an in ^¬ intermediate cylinder comprising an axially fixed portion relative to the rolling stand, namely the bending blocks, and an axially movable portion relative to said cage ^¬ blasting, namely, the chocks of each of said intermediate rolls.

Each of the upper and lower work rolls can be supported / supported laterally on both sides of the clamping plane, by lateral support members ^¬ ble adjusted in position, but axially fixed relative to the roll stand (The term axially refers to the axial di ^¬ rection defined by the longitudinal axis of rotation of working cylinders or intermediates).

Advantageously, the constructional arrangements described above allow the guide means of the side support members to remain axially stationary with respect to the work rolls during axial displacement of the cylin ders ^¬ intermediates, or specifically, for a moving ^¬ axial chocks supporting an intermediate cylinder. In fact, each of the working rolls does not comprise a chock, but is stopped axially at each of its ends by axial abutments able to keep said working roll in an axially constant or fixed position relative to the stand. rolling during rolling of a strip to be rolled. The bending blocks, integral with the guide devices of the lateral support members that they support, are axially fixed relative to the same cage. he As a result, with close functional play, in particular gaps between the ends of the working rolls and their axial stops, the lateral support members are able to remain axially fixed with respect to the working rolls during rolling. This axial fixity does not prevent each of the organs of lateral support to move radially relative to the working rolls, in particular by sliding ^¬ in slide-guiding devices, or by pivoting about a center or axis rotation of a rotary type guiding device. In other words, the lateral supporting members are adapted to move in directions included in a substantially perpendi cular ^¬ plane in the strip running plane and rolling sensi ^¬ ably perpendicular to the axial direction defined by an axis longitudinal rotation of an intermediate cylinder or working.

Advantageously, these same constructive arrangements also allow the guiding devices of the lateral support members to remain fixed with respect to the intermediate cylinders during a vertical displacement thereof, since during a vertical displacement of a block bending, and the lateral support members, and the chocks of the intermediate cylinder are moved simultaneously with said bending block which supports them. It follows that cha ^¬ side support member is able to follow the vertical displacement of the working cylinder that supports, while retaining the ability to move radially relative to these same working cylinders.

Finally, these same constructive provisions allow cha ^¬ cun guide devices of the side support members to remain advantageously fixed relative to the cage lami ^¬ swimming during dismantling of the intermediate rolls from said roll stand. Indeed, each support body la- Lateral support supported by at least one of said guiding devices integral with a bending block is able to remain axially fixed relative to the rolling stand during extraction from the rolling stand of an intermediate cylinder supported by the same block of bending. Thus, disassembly of the lateral support members is unnecessary during extraction of an intermediate cylinder, and the structural arrangements of the rolling stand according to the invention make it possible to hold said members in the rolling stand lateral support during extraction of interme diate ^¬ cylinders, regardless of their ability to move LEMENT radiators with respect to the working rolls.

In particular, the rolling stand according to the invention comprises at least one means for displacing one or more side support ^¬ ganes able to move and position said lateral support member or said lateral support members. In addition, said displacement means is in particular adapted to be guided by a direct or indirect guiding member ^¬ integral with the amounts of the rolling stand. In party ^¬ ticular, said moving means comprises at least one gold ^¬ thrust Gane, e.g., a displacement actuator, mechanical or hydraulic, guided by at least one guide member directly or indirectly secured to one or rained ^¬ eral amounts the rolling stand and able to move radially a lateral support member relative to the working cylinder that it is able to support. Actuators ^¬ placement are adapted to move synchronously ends of the side support members, said ends being in particular intended to support one of said working rolls. Said displacement actuator is for example a screw and nut device, or a wheel and worm device, or a wedge device actuating the lateral support organs, directly or via a beam distribution of thrust forces. My ^¬ niere general, the rolling stand according to the invention is particularly characterized in that two thrust members actuatable in synchronism by a screw device are adapted to act synchronously on each Extremists ^¬ a moth said lateral support members for its posi ^¬ tioning, or in another configuration, two thrust members operable synchronously by a disposi ^¬ tif corners are able to act synchronously each on one end of one of said lateral support members for positioning. In both cases, a beam of distribution ^¬ tion thrust forces can be inserted between the or¬ side support ^¬ gane and at least one of its organs pous ^¬ sée. In particular, the distribution beam of the thrust forces is intercalable between a support arm of the lateral support member and its or thrust members.

In addition, the rolling stand according to the invention comprises at least one displacement member of an intermediate cylinder which may for example be a shift actuator, ^¬ mecha nical or hydraulic said intermediate cylinder. In ^¬ ticular, each displacement actuator of a cylinder in ^¬ termédiaire is adapted to be guided by means of gui ^¬ dage the intermediate cylinder directly or indirectly secured to one or more posts of the roll stand and to move axially said intermediate cylinder. Each of the guide devices of the intermediate cylinders auto ^¬ a vertical displacement of the chocks of the cylinders in ^¬ édi intermediaries in line with the vertical displacement of the bending blocks supporting said chocks intermediate cylinders.

Advantageously, unlike rolling cages carac ^¬ terized by axial movement of the journals of the intermediate cylinders relative to their bearings in order to the axial displacement of the intermediate cylinders and requiring trunnions formed of a surface ex ^¬ extremely resistant, the present invention gives the possibi ^¬ lity chocks of the intermediate rollers to move axially by sliding in the guide housing chocks fitted in the hydraulic bending blocks and thus avoids any relative displacement of the journals by rap ^¬ port to their bearings, allowing instead a fixi ^¬ tee trunnions relative to their bearings. It is therefore possible when using standard bearings with high ca ^¬ pacity load, eg bearings four rows of rollers mounted TQO. So avanta ^¬ geous, fixity journals compared to their rolls ^¬ ments used to select these in a tight range roule- elements, ie inherently waterproof or assem ^¬ corn / tightly mounted in their chocks. The rolling stand according to the invention is thus characterized in particular by the fact that each of said intermediate rolls comprises at each of its ends a trunnion adapted to be fitted with a bearing with a high radial and axial load capacity, said bearing being suitable for be mounted in each of the chocks of said intermediate cylinders.

In addition and in particular, the rolling stand according to the invention is characterized in that said lateral support member com ^¬ takes a side support cylinder and its support rollers. In addition, particularly advantageously, said gold ^¬ gane lateral support according to the invention may comprise in particular ^¬ at least one support arm capable of supporting said lateral support cylinder and its rollers, said support arm being in particular usable as rail or disassembly as rail support on which can roll wheels or runners fitted to dismantling the chocks of the rolls intermédiai ^¬ res. Thus, each lateral support member is capable of including a disassembly rail suitable for disassembling a cylinder. Intermediate lindre. In particular, the lateral support members located on either side of the clamping plane and ^supporting the same working cylinder each comprise said disassembly rail for disassembly of the intermediate cylinder adapted to be in contact with said cylinder tra ^¬ vail, ie its extraction out of the cage, in particular by sliding shoes or running wheels equipping poises em- said intermediate roll on or in said rail. On the other hand, the rolling stand according to the invention is particularly suitable for comprising at least one oil distribu ^¬ tion member adapted to be mounted on at least one lateral support member support arm, allowing in particular to supply fluid nozzles adapted to lubricate the strip and / or the working rolls, see other cylinders for the lami ^¬ swimming. Advantageously, since the lateral support members are integral with the bending blocks and not the shells of the intermediate rolls, and also able to remain in the rolling stand during extraction / disassembly and reassembly of said intermediate rolls, it is not necessary, as in EP 0 937 517, to implement systems for automatic coupling of pipes

supplying lubricating oil to the cylinders and rollers of lateral support members. According to the present invention, the oil distribution members can be mounted on the support arms of the lateral support members, and ali ^¬ supported by flexible pipes connectable to fixed feed points on the amounts of the cage rolling and allowing radial adjustment movements of the organs of lateral supports with respect to the tra ^¬ vail cylinders.

According to one variant, the rolling stand according to the invention is characterized in particular by the fact that a shim is positionable by means of a jack between one end of an applicator member lateral port and one of said thrust members, said shim being able to be eclipsed. In particular, two spacers are positionable in a synchronized manner between each a gold ^¬ gane thrust and a lateral support member. They advantageously allow rapid disassembly of a cylinder inter ^¬ mediator by eclipsing said wedges, said eclipsing resulting in a rapid removal of the lateral support organs ^¬ raux working cylinders they are able to support. Finally, according to a particular configuration of the rolling stand according to the invention, the latter comprises eight separate hydraulic bending blocks supporting the chocks of the upper and lower intermediate rolls, respec ^¬ tively four upper bending blocks supporting the two chocks of the intermediate cylinder upper and four lower bending blocks supporting the two chocks of the lower intermediate cylinder, said camber blocks being adapted to cooperate with mechanical or hy ^¬ hydraulic actuators arranged between each pair of upper and lower bending blocks and ensuring a vertical displacement of said blocks bending to the amounts of the rolling stand in groups of four, the first group of qua ^¬ be synchronized upper blocks and a second group of lower blocks qua ^¬ be synchronized, said eight blocks of bending further comprising housing guiding chocks in which are able to slide or slide axially one of the two protuberances located on each of the two side faces of the chocks, said protuberances making said chocks slid axially with a slight clearance in the choke guide housings arranged in each of the eight blocks of hydraulic cambering and two dispo ^¬ sitifs guiding each of the lateral support members of each of the upper and lower work rolls, res ^¬ tively a first guide means secured to a first bending unit, and a second gui ^¬ dage device integral with a second bending block, the first and the second bending block supporting the same lateral support member.

In order to better understand the present invention, examples of embodiments and applications are provided using the following figures:

Figure 1 embodiment of a rolling cage sexto laterally supported according to the prior art ^¬ .

Figure 2 embodiment of a support element la ^¬ integral thereto axially fixed chocks of an intermediate cylinder according to the prior art ^¬ laughing.

Figure 3 embodiment of a support member la ^¬ integral thereto axially movable chocks of an intermediate cylinder according to the prior art ^¬ laughing.

Figure 4 example of embodiment of lateral support elements ^¬ Rails integral amounts of a cage ^¬ mining according to the prior art.

Figure 5 embodiment of a rolling stand according to the invention.

Figure 6 example of a first embodiment of a means for moving lateral support members according to the invention. Figure 7 example of a second embodiment of a means for moving lateral support members se ^¬ lon the invention. Figure 8 example of the use of lateral support members ^¬ raux as disassembly rails of the intermediate rolls according to the invention.

Figure 1 shows an embodiment according to the prior art of a laterally supported sexto rolling mill.

Conventionally, a rolling stand comprises two sexto cy ^¬ lindres of read work, ld small diameters, respectively a read upper work roll located above a running plane D of a strip to be rolled, and a cylinder lower work 1d located below said plane of travel D of the strip to be rolled. Said laminating strip runs between the two working cylinders lu, ld supported vertically, and in particular driven by friction, by a pair of intermediate cylinders 2u, 2d, themselves supported vertically by a pair of support rollers 3u , 3d exerting a bearing on said pair of intermediate cylinders 2u, 2d. The working rolls 1d have their longitudinal axis of rotation in a plane substantially perpendicular to the running plane of the band, and commonly called the clamping plane P. In case of lateral support, each work roll is not only supported by on the one hand vertically by two cy ^¬ intermediate lindres 2u, 2d, ie respectively the cylin ^¬ intermediate 2u dre upper and lower intermediate roll 2d, themselves supported by two backup rolls 3u, 3d vertical, ie respectively the upper support cylinder 3u and the lower support cylinder 3d, but also, on the other hand, each working cylinder read, ld is supported laterally by lateral support members each comprising in particular a lateral support cylinder 4u, 4d, supported by two rows of support rollers 5 mounted side by side. Thus, two cylinders of lateral support available symmetrically ^¬ on either side of the working cylinder are able to laterally support said working cylinder. In addition, each row of support rollers 5 is composed of a plurality of rollers arranged side by side along a common axis on a common two-row support arm.

FIG. 2 describes an exemplary embodiment of a lateral support member 7 of a sexto rolling cage according to the prior art, said lateral support member 7 being integral with chocks 21 of an intermediate cylinder 2. Said piles 21 are axially fixed relative to the uprights 6 of the rolling stand. The intermediate cylinder 2, in particular an upper intermediate cylinder as shown in FIG. 2, is supported at each of its ends by one of said chocks 21 axially fixed with respect to the uprights 6 of the rolling stand, but capable of vertical displacements in ^{¬ be} these same amounts. A guide in rotation of the intermediate cylinder 2 in its chock is provided by a bearing 22 comprising in particular an outer ring 221 and cylindrical rollers 222. During an axial displacement of the intermediate cy ^¬ linder 2, a trunnion 23 of said inter ^¬ intermediate cylinder is adapted to slide axially on the rollers cy ^¬ lindriques 222.

Two bodies of lateral supports 7 of which only one is here repre sented ^¬ are distributed on either side of a clamping plane P which may include in particular the axes of rotation lon ^¬ gitudinaux of the work rolls 1, to laterally support the working cylinder 1 with which they are in contact. Each lateral support member 7 comprises particu ^¬ binding a support arm 71 adapted to carry both a lateral support cylinder 4 and its support rollers 5. Thus, two lateral support cylinders 4, only one of which is shown, are distributed on either side of the clamping plane P. Each a pair of lateral support cylinders 4 is able to laterally support one of said working rolls 1. Each roll ^¬ dre side support is itself supported by two rows of rollers 5. The lateral support member 7 is also suitable to pivot about a guide member 72 secured to

1 chock 21.

The constructive arrangement of the rolling stand shown in FIG. 2 shows that it is impossible to carry out opera- extraction and maintenance rations of interme diate ^¬ cylinder 2 without preventing, with the aid of a specific tool, the pivoting of the lateral support members 7 around their guide member 72. It also shows that it is impos ^¬ sible to rectify the active face of the intermediate cylinders 2 between two rolling campaigns without disassembling the clutches 21 and the two lateral support members 7 that they support.

Moreover, since the chocks 21 are axially fixed with respect to the uprights 6 of the rolling stand, the lateral support members 7 are also fixed with respect to said uprights 6 of the rolling stand, and therefore with respect to the rolls. 1. The axial displacement of the cylinder in ^¬ intermediate 2 is ensured by axial sliding of its trunnions 23 relative to the chock 21 and the bearing 22. To this end, the pins 23 of the intermediate cylinder 2 must be extended by a length corresponding to the said ^¬ tance of axial movement of the intermediate roll 2. Figure 3 depicts an exemplary embodiment according to an art ^¬ TER AL of a lateral support member 7 in a six-high rolling stand, said lateral support member 7 being integral with em ^¬ poises 21 of an intermediate cylinder 2. Unlike the rolling stand described in FIG. 2, said chocks 21 are axially movable relative to the uprights 6 of the cage rolling. Indeed, said chocks 21 are movable axially and vertically relative to the uprights 6 of the rolling stand, while being able to support the intermediate cylinder 2 and the lateral support members 7 they support.

In particular, the intermediate roller 2, in particular a cy ^¬ intermediate lindre higher as shown in Fig. 3, is adapted to be supported at each of its ends by said la- chock 21 axially movable relative to my ^¬ tants 6 of the roll stand and capable of vertical movement between these amounts 6. A bearing 22 consisting of a outer ring 221, an inner ring 224 and rollers 222 is adapted to guide the intermediate cylinder 2 in rotation in its chock. During the axial displacement of cy ^¬ lindre Intermediate 2, the chocks 21 of the cylinder inter ^¬ médiaire are able to move synchronously with said intermediate roll, so that the pins 23 of ^¬ said intermediate roll are adapted to remain stationary with Rap- bearing port 22.

The one work roll is supported laterally on two lateral support cy ^¬ lindres 4 of which only one is shown. Each lateral support cylinder is supported by two rows of rollers 5. A lateral support member 7 comprises in particular a support arm 71 adapted to carry both the lateral support rollers 4 and the rollers 5. This body lateral support 7 is further adapted to pivot about a gold ^¬ gane guide 72 integral with the chock 21 and accompany one chock 21 during its axial displacement.

According to the constructive arrangement shown in FIG. 3, the chocks 21 are axially movable relative to the uprights 6 of the rolling stand and synchronously accompany the axial displacement of the intermediate roll. As a result quently, the lateral supporting members 7 are capable of MOVE ^¬ cer relative to the work roll 1, that remains axially fixed between axial limit stops (not shown) which are themselves, during rolling, axially fixed relative to the uprights 6 of the rolling stand.

FIG. 4 shows an exemplary embodiment of side ap ^¬ and lateral members 7 of a rolling stand according to the prior art, said lateral support members 7 being integral with the uprights 6 of the rolling stand. The roll stand is equi ^¬ pée two working rolls 1, each supported on the one hand vertically by two intermediate rolls 2, and the other laterally by two lateral supporting rollers 4 themselves supported by two rows of rollers 5 side by side. In particular, each of said cylinders in ^¬ intermediates 2 is itself supported by a backup roll 3 vertical. Under the action of a mechanical actuator or hydrau lic ^¬ (not shown), a support arm 71 adapted to cover both lateral support cylinder 4 and the rollers 5 is slidable in a guide device 72 fixed to the amount 6 of the rolling stand. If movement verti cal ^¬ of the working cylinder 1, for example a verti cal ^¬ movement of an upper work roll towards the upper backing roll, interference 8 between the work roll 1 and at least one of two cylinders support ^¬ lateral 4 can take place. In other words, the working roll 1 is able to interfere with a lateral support roll 4, for example by contacting the latter, during a vertical displacement of said work roll 1.

FIG. 5 shows an exemplary embodiment of a rolling stand according to the invention. In particular, the rolling stand comprises two working rolls 1 capable of gripping a strip to be rolled, more specifically, an upper working roll situated above a rolling plane D of the rolling mill. laminating strip, and a lower working cylinder located below said plane of travel D of the strip to be rolled, the upper and lower working rolls 1 having their longitudinal axes of rotation in a clamping plane P substantially perpendicular to the plane of travel D of the strip to be rolled, two intermediate cylinders 2, respectively an upper intermediate cylinder adapted to be in contact with the upper working cylinder and a lower intermediate cylinder adapted to be in contact with the lower working cylinder, two cylinders 3, respectively a cylindrical ^¬ dre upper support adapted to be in contact with the upper intermediate cylinder, and a lower support cylinder adapted to be in contact with the lower intermediate cylinder ^¬ the bearing cylinders upper and lower being ap- your transmitting a clamping force to the cylinder tra ^¬ vail 1 through i cylinders intermediates, or in other words, the rolling stand comprises six cylinders su ^¬ vertically disposed in a cage configuration of the sexto ^¬ minning, and further comprises at least one lateral support member 7 adapted to laterally support one of said work rolls 1, in particular a first and a second member upper lateral support, located on either side respectively of said clamping plane and adapted to support lateral ^¬ said upper work roll 1, and a first and a second member of lower lateral support, located on either side of said clamping plane and able to support lateral ^¬ the lower working cylinder 1, the rolling stand according to the invention is characterized in that it comprises at least one block cambering device 9 for cambering said intermediate cylinders 2, said bending block 9 being able to be displaced vertically with respect to uprights 6 of the rolling stand and with support er said bearing member laté ^¬ ral 7. In particular, said bending block 9 is more preferably capable of supporting an axial displacement of at least one chocks 21 of the intermediate rolls 2 and ser- to the camber of at least one of said intermediate cylinders ^¬ res 2. Thus, the rolling cage according to the invention comprises in particular at least one bending block 9 capable of moving vertically relative to the uprights 7 of the rolling stand , while serving as support for said lateral support member 7, at least one chock 21 of an intermediate cylinder ^¬ diaire 2, and allowing axial displacement of said em ^¬ poise 21 relative to the uprights 6 of the cage of rolling, and therefore the intermediate cylinder 2 that it supports.

The constructive arrangements described in FIG. 5 allows ^¬ tent organs of lateral supports 7 to remain axially stationary with respect to the work rolls during a MOVE ^¬ cement axial intermediate rolls, to remain fixed relative to the intermediate roll during a move ^¬ said intermediate vertical cylinders, remain fixed relative to the roll stand during disassembly of the intermediate rolls from said cage, and tou ^¬ your circumstances, such structural arrangements of the invention allow for lateral support bodies res ^¬ ter adjustable radially relative to the tra ^¬ vail cylinders.

In particular, each of said bodies of lateral supports 7 comprises a support arm 71 adapted to carry a nickel cylinder ^¬ lateral tien 4 and 5 support rollers. Organ lateral supports are particularly suitable for laterally supporting said work rolls 1 by means of said lateral support cylinders 4. Each of these is capable of contactors ter laterally said work rolls to many a ^¬ ne the cylinder Work 1 in a lateral position sen ^¬ sibly constant or according to a set position. Ef ^¬ fet, each side of one of said one work roll is adapted to be supported by bearing against one of its generatrices, by one of said lateral supporting rollers distributed thereby on both sides of said clamping plane P. In particular, said lateral support rolls 4 are further supported laterally by two rows of said rollers 5 ap ^¬ pui mounted side by side.

In particular, the intermediate cylinders 2 are capable of being supported at each of their ends by said nozzle 21 which is axially movable relative to the uprights 6 of the rolling stand, said mobility of the chock resulting for example from a sliding of parts of said chock 21 on parts of the bending blocks 9 provided for this purpose.

Each lateral support member is particularly suitable for pivo ^¬ ter around a guide device 72, or more precisely around an axis of rotation of a guide device 72 fixed to one of said blocks camber 9, or to slide in a direction or a path defined by said guide member 72. In particular, a lateral support member displacement means, comprising for example a thrust member 73, is adapted to rotate said support member ^¬ terateral around said guide device 72, in particular around its axis of rotation. In particular, the support arm 71 of said lateral support member is adapted to pivot ^¬ turn of said guide device 72, in particular under the action of said thrust member 73 capable of taking radial forces received by the working cylinders 1 to rolling course. To ensure a good recovery of these efforts ra ^¬ diaux by limiting the risk of bending of the support arm 71, a beam distribution of forces 731 with high inertia is intercalable between the thrust members 73 and said support arms 71 to distribute the reactions of thrust members 73 along the entire length of the support arm 71. the fi ^¬ Figures 6 and 7 these show an example of implementation of such beam distribution of forces 731. Each of the thrust members 73 of said means moves ^¬ is in particular actuatable by at least is an actuator screw or wedge 74 capable in particular of ma- actuate synchronized niere at least two thrust members 73, cha ^¬ cun located at a longitudinal end of the lateral support member, said longitudinal end in particular re ^¬ ference at each of the two ends of the support member ^1'¬ téral 7 along the width of the strip. A jack 75 is in par- ticular suitable for acting, ie exert a force between a bending block 9 and a pivot point 76 to a member ap ^¬ lateral pui 7 supported by the guide device of said block bending, to ensure the pivoting of said side bearing member about an axis of rotation of said guide means 72 secured to said bending block 9. advantageously, said pivot allows positioning ^¬ said lateral support members when the thrust members 73 are in the retracted position. In particular, a support arm 71 of a lateral support member 7 comprises said jointing point 76. In this case, said jack 75 is for example a hydraulic jack secured to one of said bending blocks and adapted to pivoting said support arm 71 comprising said hinge point 76 about said axis of rotation of the guide device 72.

Moreover, each bending block 9 is particularly adapted to be moved vertically by an actuator 92, say ^¬ posed in particular between the bending blocks 9 of a pair of bending blocks comprising an upper bending block and a lower bending block, said upper and lower bending blocks being distributed on either side of the scroll plane of the strip to be rolled, close to the same end of a working cylinder 1. Thus, the cage of lami ^¬ ing according to the invention comprises in particular hydraulic actuators 92 capable of ensuring a vertical displacement said bending blocks 9 relative to the uprights 6 of the rolling stand. In particular, four actuators 92 hy ^¬ draulic may be disposed between a first group of four blocks of higher bending and a second group of four blocks of lower bending, each of said share ^¬ neurs being capable of vertically moving the block cam ^¬ brat d a bending block pair 9 comprising an upper bending block and a lower bending block. For this purpose, a hydraulic actuator 92 may be arranged between the bending blocks of each pair of bending blocks 9, in order to vertically and synchronously move groups of four bending blocks 9 relative to the uprights 6 of the bending cage. rolling, in particular said first group of four upper bending blocks movable synchronously by their hydraulic actuators and said second group of four lower blocks synchronously movable by their hydraulic actuators. In particular, the bending blocks 9 are able to move vertically on bending block supports 91 which are solid with the uprights 6 of the rolling stand.

FIG. 6 shows a first exemplary embodiment according to the invention of a means for moving ^¬ lateral support members, comprising in particular two thrust members 73. In particular, the support member support arm 71 The latter is capable of being pushed by the two thrust members 73. The latter are able to be guided on the uprights 6 of the rolling stand and / or on supports of bending blocks integral with said posts and to act in a synchronized manner. See. These pushing members can in particular be ac ^¬ tioned each by a screw 741 fixed in rotation and adapted to de¬ ^¬ place reversibly axially said pous ^¬ body 73 under the action of a wheel member and worm or a tapered bevel gear 742. The tapered gear taper 742 is particularly suitable for 743 wedges 744 able to be eclipsed and actuated by jacks 745 allow in particular to quickly release the support arm 71 of a lateral support member. Each of said wedges is in particular positioned between said thrust member and said support arm 71. Advantageously, a beam repai ^¬ Posted efforts 731 high inertia is especially in- tercalable between the thrust members 73 and the support arm 71 to distribute the thrust forces over the entire length of said support arm 71.

Figure 7 shows a second example of a way of moving ^¬ of lateral support members according to the invention include an ^¬ nant including two thrust members 73 capable of moving, in particular by pushing, the hinge arm lateral 71.

Each of said thrust members 73 is particularly adapted to be guided on the uprights 6 and / or bending block supports. These thrust members are in particular ac ^¬ tionable synchronously by two corner boxes 746. In particular, under the action of a wedge ramp 747 actuable by a cylinder 748, said thrust members 73 are particularly suitable for move axially. ^¬ Advantageously, the pins 749 engageable in grooves parallel to the taper of the wedges in particular allow a return ar- Rière thrust members 73 and providing a point of the die ^¬ placing said thrust members. Similarly to the constructive arrangements presented in FIG. 6, ^ca¬ 744 able to be eclipsed and actuated by jacks 745 allow in particular to quickly release the support arm 71 of a lateral support member. Said wedges are each in particular positionable by means of said jacks 745 between said thrust member and said support arm 71. Advantageously, a force distribution beam 731 with high inertia is in particular intercalable between the thrust members 73 and the support arm 71 in order to distribute thrust forces over the entire length of said arm sup ^¬ Port 71.

FIG. 8 shows an example of use of lateral support members 7 as disassembly rails for the intermediate rolls 2 according to the invention. Blocks bending su ^¬ périeurs 9u and lower 9d are spreadable in the disassembly position by displacement on cam block support ^¬ brat 91, said blocks carriers 91 being bending so- lidaires of uprights 6 of the roll stand. In particu ^¬ link, each support arm 71 of each of said side support members is adapted to be pivoted about an axis of rotation of the guide device 72 which supports it, to ensure a free passage of the upper chocks and 21u lower 21d, respectively carrying the upper intermediate cylinder ^¬ 2u and the lower intermediate cylinder 2d.

On the other hand, each of the upper support arms 71u of the upper lateral support members is capable of including in particular a surface 711u of sliding or rolling adapted to cooperate with rollers or gliding pads ^¬ ment (not shown ) that can equip ears 211u of higher chocks 21u. Thus, in the disassembly position, an extraction of an upper intermediate cylinder 2u carried by said upper chocks 21u able to move axially by sliding or rolling respectively said pads or said wheels on said surfaces 711u is achievable by axial displacement of said chocks on the upper support arms 71u of the lateral support members to a disassembly carriage (not shown) out of the rolling stand.

Similarly, each lower support arm 71d of lower lateral support member comprises a surface 711d of sliding sowing or rolling allowing the lower chocks 21d to move axially by sliding or rolling respectively by means of sliding shoes or rollers (not shown) which can equip surfaces 211d of said lower chocks 21d, said sliding pads or wheels being intended for cooperating with the sliding or rolling surfaces 711d to allow extraction of the lower intermediate cylinder 2d and its infre ^¬ infers 21d out of the rolling stand to a disassembly carriage.

In summary, the rolling stand and the method works ^¬ a rolling stand according to the invention Sev- eral advantages over existing methods of operation and rolling stands in that the lateral support members remain axially fixed relative to the working rolls during the axial displacement of the intermediate rolls, which significantly reduces the axial forces generated by the displacement of said intermediate rolls on the axial stops of the working rolls and the friction of the lateral support rollers on the work rolls;

the lateral support members are stationary with respect to the intermediate rolls during the movement ^¬ ver tical thereof, which prevents any risk of degra ^¬ dation of the installation by interference between the work rolls and the lateral supports during pha ^¬ ses opening and closing of the rolling stand; the lateral support members remain fixed relative to the rolling stand during disassembly of the intermediate rolls from said cage, which allows perform the maintenance of the intermediate cylinders as in a conventional 6-High cage or a 4-High cage, without special tools and without the need to dismantle the chocks;

they make obsolete the use of connection devices ra ^¬ pide or automatic lubrication circuits of the bearings of the intermediate cylinders when

the extraction and reassembly of these cylinders due to the use of sealed bearings that do not require a lubrication circuit;

they allow to use for interme ^¬ diate cylinders, standard bearings with high load capacity, less expensive and much stronger than special bearings without inner ring;

they allow to use for interme ^¬ diate cylinders, sealed bearings for

using selected independent rolling fluids ^¬ pendently lubrication needs of rolls ^¬ ments;

they are free of constraints related to a surface material and a trunnion geometry allowing axial displacement of said trunnions of cylinders in ^¬ intermediate with respect to their bearings. Indeed, they eliminate the need to use intermediate cylinder journals of great length and special ^¬ cured, previously used to the axial movement of the intermediate roll;

they ensure an axial displacement in charge of the cylinders ^¬ intermediate dres without sliding bearings relative to the trunnions;

they make obsolete the use of quick connection devices or automatic lubrication circuits of the lateral support rollers and rollers that support them. due to the fact that the support arms capable of sup ^¬ wear remain in the rolling stand during

extraction and reassembling of the interme diary ^¬ cylinders;

they make obsolete the use of quick connection devices or automatic lubrication circuits and cooling of the rolled strip and the surface of the rolling rolls during the extraction and remon ^¬ tage of the intermediate rolls when nozzles of spraying of the lubricating fluid are fixed on the lateral support members

they provide axial fixity of the support members ^¬ lateral with respect to axial stops of the working rolls, while maintaining a capacity for radial movement of these lateral support members with respect to said working rolls;

they provide securing of the support bodies ^¬ TERAL compared with chocks of interme diate ^¬ cylinders to organs of lateral support and intermediate rolls move vertically in a synchronous manner, while maintaining the radial movement capability of the organs of lateral supports in relation to cy ^¬ working lindres;

they guarantee an axial rigidity of the side support members relative to the rolling stand while retaining a radial movement capability of the orga ^¬ nes of lateral supports with respect to the tra ^¬ vail cylinders and while also maintaining their ver tical movement ^¬ synchronous with cy support devices ^¬ intermediate lindres;

they streamline foreign exchange ^¬ cylinders, especially sets cy ^¬ lindres intermediate and higher labor and NCI ^¬ laughing.

Claims

claims

1. Rolling cage comprising two working cylinders (1) capable of gripping a strip to be rolled, two cylinders in ^¬ intermediate (2), two bearing cylinders (3), at least one lateral support member (7) adapted to support laterally one of said working rolls (1), characterized in that at least one bending block (9) intended for the bending of said intermediate rolls (2) is able to be ^de¬ vertically placed relative to the uprights ( 6) of the rolling stand and supporting said support member ^¬ terral (7).

2. Rolling stand according to claim 1, characterized in that said bending block (9) comprises a guiding device (72), integral with said bending block (9), and adapted to support and guide said lateral support member (7).

3. Rolling stand according to one of claims 1 or 2, ca ^¬ characterized in that said bending block (9) is adapted to support at least one chock (21) of an in ^¬ intermediate cylinder (2), and an axial displacement of the latter.

4. Rolling stand according to one of claims 1 to 3, ca ^¬ characterized in that said lateral support member (7) is pivotable about said guide device (72) integral with said bending block (9).

5. Rolling stand according to one of claims 1 to 4, ca ^¬ characterized in that an actuator (92) is able to displa ^¬ vertically cer de said block bending (9).

6. Rolling stand according to claim 5, characterized in that a first group of four bending blocks

(9) adapted to act as support for the chocks (21) of a cy ^¬ intermediate lindre upper and a second group of four blocks of bending (9) adapted to act as support for the chocks (21) of a lower intermediate roll, are each movable vertically relative to the uprights

(6) of the rolling stand synchronously by means of at least one actuator (92).

7. A rolling stand according to one of claims 1 to 6, ca ^¬ ractérisée in that axial displacement members are adapted to move axially said inter ^¬ intermediaries cylinders (2) by displacement of the chocks (21) of said intermediate rolls relative to cam ^¬ bration blocks (9).

8. Rolling stand according to one of claims 1 to 7 ca ^¬ characterized in that at least one means for moving a lateral support member (7) is able to move and position said ^¬ side support member (7).

9. A rolling stand according to claim 8, characterized in that said moving means comprises at least one thrust member (73).

10. Roll stand according to claim 9, characterized in that two thrust members (73) actuated in synchronism by a screw device (74) are operable in synchronism each on an ex ^¬ Tremite of one of said lateral support members (7) for positioning thereof.

Rolling stand according to Claim 9, characterized in that two pushing members (73) operable from synchronized manner by a device with corners are able to act synchronously each on one end of one of said lateral support members (7) for positioning.

Rolling stand according to one of claims 9 or 11, characterized in that a shim is positionable by means of a jack between said end of a support member ^¬ lateral (7) and one of said thrust members (73). ).

Rolling stand according to one of Claims 10 to 12, characterized by a high-inertia thrust load distribution beam (731) between a lateral support member (7) and at least one of its thrust members.

Rolling stand according to one of claims 1 to 13, characterized in that each lateral support member is adapted to comprise a disassembly rail suitable for disassembly of an intermediate roll.

Operating method of a rolling stand compre ^¬ ing two working rolls (1) adapted to enclose a strip to be rolled, two intermediate rolls (2), two support rollers (3), at least one supporting member lateral member (7) adapted to laterally support one of said working cylinder (1), characterized by an adjustable positioning of the lateral support member (7) allowing:

- Firstly, a fixed support of the lateral support member (7) relative to the working roll (1) adapted to be supported by said lateral support member ^¬ ral (7), during an axial displacement of the intermediate cylinder (2) adapted to be in contact with said working cylinder (1); - Secondly, a fixed support of the lateral support member (7) relative to the intermediate cylinder (2) during its vertical movements adapted to be in contact with the working cylinder (1) adapted to be supported by said body lateral support (7);

- and thirdly, a fixed maintenance of the organ

lateral support (7) relative to the cage ^¬ swimming during disassembly of said intermediate cylinders ^¬ diaries (2).