Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
  • B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
  • B21B31/10—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts by horizontally displacing, i.e. horizontal roll changing
  • B21B31/103—Manipulators or carriages therefor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
  • B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
  • B21B31/10—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts by horizontally displacing, i.e. horizontal roll changing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
  • B21B31/08—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
  • B21B31/10—Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts by horizontally displacing, i.e. horizontal roll changing
  • B21B31/106—Vertical displacement of rolls or roll chocks during horizontal roll changing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
  • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
  • B21B2013/025—Quarto, four-high stands
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
  • B21B2203/32—Roll changing stools

Definitions

• the content of priority application FR 16 53 411 of 18 April 2016 is incorporated by reference.
• the invention relates to a method of changing the rolls of a rolling mill for a metal strip, and a rolling mill comprising a rolling mill and a cylinder change system advantageously allowing the implementation of the method according to the invention.
• the field of the invention is that of Quarto cage mills which find particular application, for example in annealing lines, or galvanizing lines, or else, offline mills, reversible or non-reversible, for metal band .
• the mill according to the invention has a particular application, especially after annealing of the strip, to make a skin pass, often for the purpose of removing the elastic bearing from the metal strip to print a roughness and / or improve the brightness and / or improve the flatness.
• a Quarto cage mill has a holding cage comprising two pairs of uprights, at both ends of the cage between which are provided four cylinders with parallel axes, namely two working rolls, lower and upper, defining the air gap the strip to be rolled, as well as two support rolls, upper and lower, respectively bearing on the working rolls, on the opposite side to that of the air gap.
• the motorization of the cylinders is provided on one side of the cage, the other side, said operator side being the one where the maintenance operations are performed, in particular the cylinder change operations through the access window present between the two uprights of the cage on this operator side.
• each support or working cylinder is rotatably mounted at its ends on chocks, by means of bearings, for example bearings or hydrostatic bearings. These chocks are supports that can be moved in a direction parallel to the clamping plane, between the two amounts of the cage.
• a rolling mill of the Quarto type comprises means for applying a clamping force between the chocks of the support rolls, in the form of two hydraulic cylinders, often at the lower end of the cage, bearing respectively on the two chocks of one of the support cylinders, often inferior.
• these two hydraulic cylinders allow the opening of the cage, namely the separation of the upper rollers (upper support cylinder and working roll) with respect to the lower rolls (lower support roll and lower work roll) , and in a position where these can be extracted from the cage.
• each chock typically comprises two sliding plates, parallel and opposite, on either side of the axis of rotation of the cylinder, and cooperating with sliding plates secured to the uprights and parallel to the latter, at the level of on both sides of the window.
• These sliding plates do not, however, ensure the blocking of the chocks (and their cylinder) along the axis of the supported cylinder.
• the system for clamping the chocks of the working or bearing cylinders comprises, typically for each chock, two vertical grooves of the opposite chocks located on either side of the axis of rotation. cylinder, and two associated locking members respectively integral with the uprights, movable horizontally. Each locking member can move from a locking position in which the locking member penetrates the vertical groove, to an unlocked position in which the locking member is retracted out of this groove.
• the locking member In the locking position, the locking member, secured to the upright, prevents the displacement of the chock along the axis of the cylinder, while allowing the sliding of the chock along the vertical axis of the uprights, by moving the the locking member along the vertical groove of the chock.
• the support cylinders and working cylinders of the Quarto type rolling mills of the state of the art are extracted from the holding cage, through the access window on the operator side, by means of two independent extraction systems. , in parallel, superimposed one above the other, located on the side of the motorization of the rolling mill, namely:
• a first extraction system comprising an actuator, typically a hydraulic jack, the stroke of which is sufficient to allow the extraction of the working rolls from the holding cage, by a thrusting action and displacement of the working roll following its longitudinal axis, and
• a second extraction system independent, comprising another actuator, typically another hydraulic cylinder, whose stroke allows extraction of the support cylinders from the holding cage, by a thrust action and displacement of the cylinder; support along its longitudinal axis.
• the document WO03 / 099479A1 further discloses a method for extracting the rolls, which extracts the work rolls marked 2a and 2b, but also the extraction of the support rollers 3a, 3b using only the running actuator horizontal actuator marked 7 for the thrust of the work rolls out of the cage, then for the thrust of the support rollers out of the cage.
• the process for extracting the four cylinders is as follows, and is decomposed in two stages, first with the extraction of the working rolls and then with the extraction of the support rolls.
• the two clamps hydraulic or electrical
• the actuator 7 identified is used to push for simultaneously extracting the two working rolls 2a and 2b, which are then extracted from the roll stand, and while the support rolls 3a and 3b are still present in the stand.
• a support equipment (marked 11) which is inserted into the roll stand, arranged between the upper support roll and the lower support roll.
• the support equipment 11 is connected to the actuator 7.
• the upper clamp 18 of the upper arm (17a ) engages with a specific part 19 of the support equipment 11.
• the stroke of the actuator is then used to exit the lower support cylinder assembly 3b / support equipment 11 / lower support cylinder, in one piece .
• the extraction system comprises a single actuator (marked 54) with a horizontal stroke, provided with a coupling head (a marked hook 54a) which makes it possible to pull out all the cylinders (working and support), and in an illustrated sequence of Figures 6 (A) through 6 (D).
• FIG. 6 (A) illustrates the step of extracting the two working rolls (jointly) by the actuator pushing action 54. Successively, at this extraction, the lower support roll 53 is lifted by cylinders 16 , allowing the setting of the chock of the lower support cylinder 54 with the hook 54a of actuator 54 horizontal. The same actuator 54 with a horizontal stroke is then used to release the lower support cylinder 53, and while the upper support cylinder is still present in the roll stand.
• FIG. 6 (B) illustrates the next step for positioning a support equipment, marked 59 ("roll changing stool"), resting on the chocks of the lower bearing cylinders (then out of the cage), before inserting the assembly in the roll stand, namely the lower support roll and the support equipment by the pulling action of the actuator 54, and as shown in Figure 6 (C).
• a support equipment marked 59 ("roll changing stool")
• the upper support cylinder is then lowered on the support equipment 59, supported by its chocks, the actuator 54 is then used for the joint thrust of the assembly comprising the lower support cylinder, the support equipment and the upper support cylinder (superimposed).
• the support rails of the lower support cylinder are aligned with the marked rails 18 allowing the output of the lower support cylinder. Raising the rails from the low position to the high position still allows the hook 54a to engage with a complementary hook of the chock of the lower support cylinder.
• the actuator 54 horizontal stroke for the thrust of the rolls must necessarily be combined with a system of rails, for supporting the chocks of the lower support cylinder and whose jacks marked 16 to change the level of the lower support cylinder (and thus the lower working cylinder bearing on the latter) to allow the same hook 54a of the horizontal actuator to respectively engage with a hook 54b of the chock of the work roll (in the low position of the rails 15 illustrated in Figure 6 (A), and engaged with a hook 24 of the chock of the lower bearing roll (in the upper position of rails shown in Figs. 6 (B) to 6 (C)).
• the present invention meets this objective by proposing a cylinder changing method which advantageously allows the use of an extraction system using a single actuator to extract all the rolls of the rolling mill.
• the object of the present invention is such a single actuator method whose coupling head can be linked, firstly to the chock of a working cylinder, then in a second time to the chock of a support cylinder, to allow the extraction of all the cylinders (namely the working cylinders and the support cylinders) by limiting the costs of the installation necessary for these operations, and by comparison in the state of the art disclosed in US 2002/0078728.
• Another object of the present invention is to provide such a rolling mill comprising a rolling mill, and a cylinder extraction system, lower cost compared to the state of the art facilities, particularly suitable for the implementation implementation of the method.
• the invention relates firstly to a method of changing the rolls of a metal strip rolling mill, implemented in an installation having:
• a rolling mill comprising: a holding cage,
• a set of superimposed cylinders with substantially parallel axes comprising two lower and upper working rolls, defining the passage gap, and two respectively lower and upper support rolls for respectively bearing on the working rolls of the opposite side. to that of the passing air gap,
• each cylinder having two rotatably mounted ends, each on a bearing carried by a chock, guiding means between the chocks of the rolls and the holding cage along the clamping plane,
• Means for applying a clamping force between the chocks of the bearing cylinders comprising hydraulic cylinders, - a clamping system of the chocks of the cylinders, ensuring the locking of the chocks relative to the holding cage, following the axis of the cylinder, while allowing the sliding of the chocks along the guide means, according to the clamping plane,
• a system for extracting the work rolls and support rolls provided, on the motorization side of said rolling mill comprising:
• an actuator configured to push the rolls out of the roll stand while the rolls are being pulled out, or on the contrary to pull the rolls into the stand during insertion of the rolls
• a coupling head integral with said actuator located in the open position of the holding cage, at an intermediate height level between the lower working roll and the lower supporting roll, movable in a direction parallel to the rolls; from a first retracted position for which the coupling head is located motor side, to a second extended position for which the coupling head having passed through the holding cage is located operator side, said coupling head comprising:
• first coupling means configured to drive the chock or the end of the lower working roll, on the motorization side of the rolling mill
• second coupling means configured to drive the chock of the lower support roll, on the motor side of the rolling mill.
• a first extraction step during which are extracted the upper working cylinder and the lower working cylinder, by a thrust action of said actuator on the chock of the lower working cylinder, motor side, the coupling head passing from the first retracted position to the second extended position, said upper working cylinder being driven together with the lower working cylinder by the mechanical connection created, on the operator side, between the chocks of the lower and upper work rolls, said second means of coupling of the coupling head being in said retracted state where they do not cause the chocks of the support cylinders during this thrust action,
• a deposition step during which the upper support roll is deposited on the upper part of the support equipment, by a descent action of said upper support roll
• a third extraction step during which is extracted the assembly comprising the lower support cylinder, the support equipment, and said upper support cylinder by a thrust action of said actuator on the chock of the lower support cylinder, motor side.
• the coupling head can be coupled to the working roll (and while the second coupling means are in the retracted state and do not drive the lower support roll) to allow the implementing the first step of extracting the work rolls and then being coupled to the lower support roll for the implementations of the following steps, this change being made manually, in other words without the use of an actuator (such as the jacks marked 16 as in US 2002/0078728) to allow this change of coupling.
• the change of coupling of the coupling head is obtained by a manual action of an operator (and therefore without the use of a electric actuator, hydraulic pneumatic or other that strike the cost of installation).
• the second coupling means comprise at least one movable element, articulated to the frame of the coupling head, suitable for cooperating with the thrust with the chock of the lower bearing cylinder, which on the one hand, in the retracted state of the second coupling means, is raised and locked in a retracted position where said movable element does not engage with the chock, of the lower support cylinder, motor side, and which on the other hand, in the deployed state of the second coupling means is in an extended position where said movable member projects downward under the action of gravity, and wherein said movable member is configured in said deployed position to engage with a projecting portion on the upper face the chock of the lower support cylinder on the motorization side, and in which:
• said passage of the coupling head from the second deployed position to the first retracted position causes the projection to engage against the movable element, which pivots about its articulation under the action of the projecting part, to escape said projecting part, before returning, under the effect of gravity, in a position in which said movable element projects downwards, on the other side of the protruding part during the second extraction step, said movable element abuts against said projecting part, on the other side of the projecting part, under the actuator pushing action and so as to allow said cylinder to exit lower support.
• the rolling mill holding cage comprises support rails on which the chocks of the upper and lower work rolls rest, in the open position of the holding cage, said support rails guiding the work rolls and their chock during extraction of the cylinders in said holding cage,
• said rolling installation comprises a support carriage having supporting rails suitable for supporting and guiding the chocks of the lower and upper working rolls, which, in a relative position of the carriage with respect to the rolling mill, extend the support rails of the rolling mill. , and in such a way that the lower and upper work rolls are loaded onto the support carriage when the coupling head reaches said second deployed position in the first extraction step.
• the first coupling means comprise a hook rigidly secured to the coupling head intended to engage with a corresponding hook integral with the motor-side end of the lower work roll, and suitable for exerting a thrust force on the work roll lower during the first extraction step and the passage of the coupling head of the first retracted position to the second deployed position and to exert a traction force on the working cylinder during the passage of the coupling head of the second position deployed towards the first retracted position;
• the second coupling means comprise at least one folding element suitable for cooperating with the chock of the lower support cylinder, which
• the invention also relates to a rolling plant having:
• a set of superimposed cylinders with substantially parallel axes comprising two lower and upper working rolls, defining the passage gap, and two respectively lower and upper support rolls for respectively bearing on the working rolls of the opposite side. to that of the passing air gap,
• each cylinder having two rotatably mounted ends, each on a bearing carried by a chock,
• means for applying a clamping force between the chocks of the support rolls comprising hydraulic jacks,
• a system for extracting the work rolls and support rollers located on the motorization side of said rolling mill comprising:
• an actuator configured to push the rolls out of the roll stand while the rolls are being pulled out, or on the contrary to pull the rolls into the stand during insertion of the rolls
• a coupling head integral with said actuator located in the open position of the holding cage, at an intermediate height level between the lower working roll and the lower bearing roll, movable in a direction parallel to the rolls; from a first retracted position for which the coupling head is located motor side, to a second extended position for which the coupling head having passed through the holding cage is located operator side, said coupling head comprising:
• first coupling means configured to drive the chock or the end of the lower working roll, next to the drive means of the rolling mill
• second coupling means configured to drive the chock of the lower support roll, on the motorization side of the rolling mill, exhibiting a retracted state in which they do not lead to the chock of the lower support roll and an expanded state in which they push the chock of said lower support cylinder
• chocks of the upper and lower work rolls have connecting means, on the operator side, opposite to the drive means, providing a mechanical connection between these chocks on the operator side, and wherein the first coupling means and the second coupling means of said extraction system are configured to allow:
• the second coupling means comprise at least one movable element, articulated to the frame of the coupling head, suitable for cooperating with the thrust with the chock of the lower support cylinder, which:
• said at least one movable element is reassembled and locked in a retracted position where said movable element does not engage with the chock, the lower support cylinder, motor side of the rolling mill,
• the second coupling means in the deployed state, the second coupling means is in a deployed position in which the said moving element projects downwards under the action of gravity.
• said movable member is a manually actuated member to move from the retracted position to the deployed position of said movable member, or conversely, said movable member being configured in said extended position to engage with a projecting portion on the upper face of the chock of the lower support cylinder on the drive side, present in the support cage, and in such a way that:
• the rolling mill holding cage comprises support rails on which the chocks of the upper and lower work rolls rest, in the open position of the holding cage, said support rails guiding the work rolls and their chock during extraction of the cylinders in said holding cage,
• said rolling installation comprising a support carriage having supporting rails suitable for supporting and guiding the chocks of the lower and upper working rolls, which, in a relative position of the carriage with respect to the rolling mill, extend the support rails of the rolling mill and such that the lower and upper work rolls are loaded on the carriage during the thrust action of the actuator on the work rolls.
• the first coupling means comprise a hook rigidly secured to the coupling head intended to engage with a corresponding hook secured to one of the ends of the lower work rollers and suitable for exerting a thrust force on the lower work roll during the thrust action of the coupling head from the first retracted position to the second deployed position, and to exert a traction force on the lower working cylinder during the passage of the coupling head of the second position deployed to the first retracted position;
• the hooking and unhitching between, on the one hand, the hook of the first coupling means of the coupling head, on the one hand, and the corresponding hook of the lower working cylinder are caused by the movements of the carriage, in a direction perpendicular to the support rails.
• the second coupling means comprise at least one folding element suitable for cooperating with traction with a chock of the lower support cylinder on the motorization side, which in said extended position of said folding element, it is possible to engage abutment with the motor-drive side chock of the lower support cylinder to exert traction, allowing insertion of the lower bearing cylinder in the roll stand,
• said folding element is a manually actuated member to move from the deployed position to the folded position of said folding member, or vice versa.
• the chocks on the operator side of the work rolls having sliding plates, parallel and distributed on either side of the axis of the cylinder, intended to cooperate with sliding plates integral with two uprights operator side of the rolling mill
• the connecting means comprise at least one blade whose proximal end is integral with one of the lower or upper chocks, received in a lateral groove, formed in the body of the chock, on the back of a plate sliding, and whose distal end enters a groove of the other chock, at least in an extended position of said blade, in said open position of the holding cage.
• FIG. 1 is an overall perspective view illustrating the rolling mill of the Quarto type, including the holding cage in which the support and working cylinders are present, the motorization of the bearing rolls of the rolling mill, as well as the extraction system with a single actuator, of the motorized pinion / rack type, located on the motorization side of the rolling mill, the perspective view still illustrating, on the operator side of the holding cage (opposite to that of the motorization), the carriage supporting the cylinders working, U-shaped support equipment (removable), insertable into the support cage intended to jointly release the two support cylinders, and still handling devices for lifting the support cylinders and work, or said support equipment,
• FIG. 2 is a sectional view along a plane passing through the clamping plane of the rolling mill, illustrating more particularly the extraction system, in said first retracted position of the coupling head,
• FIG. 3 is a detailed view of FIG. 3 illustrating more particularly the hook of the first coupling means of the coupling head, in engagement with a corresponding hook integral with the end (motor side) of the lower working cylinder. in the first retracted position of the coupling head,
• FIG. 4 is a sectional view of the rolling mill, in a vertical plane perpendicular to the rolls,
• FIG. 5 is a view of the rolling stand of the rolling mill
• FIGS. 6 and 7 are views of the working and bearing cylinders, respectively in the closed position and the opening of the holding cage
• - Figures 8 and 9 are partial views of the rolling facility, operator side, illustrating the support carriage of the working rolls, respectively in a retracted position of the extraction zone, and in a carriage position for receiving working cylinders during their extraction
• - Figure 10 is a detailed view of the chocks (operator side) of the working rolls, and more particularly the organs for the creation of a mechanical connection ensuring the joint output of the two cylinders of when the actuator of the extraction system only exerts a thrust (motor side) on the lower working cylinder
• - Figure 11 is a view, motor side of the rolling mill, in the first retracted position of the coupling head, said first coupling means then engaged with the end of the lower support cylinder, said second coupling means in the retracted state in which they do not lead to the thrust of the lower support cylinder
• FIG. 12 is a successive view of FIG. 11, illustrating the first extraction step in which the actuator drives the coupling head to the thrust, then in engagement with the lower working cylinder, thus causing the extraction of the lower working cylinder and, together, the upper working cylinder by means of the mechanical connection illustrated in FIG. 10, the upper and lower work rolls thus being loaded onto the support rails of the support carriage, the support rolls, 5 is a consecutive view of FIG. 12, the upper and lower working cylinders then extracted from the holding cage and completely supported by the carriage when said coupling head is in its position. second position deployed,
• FIG. 14 is a subsequent view of FIG. 13, for which the support carriage is moved laterally, releasing the extraction zone, operator side of the holding cage,
• FIGS 15 and 16 are respectively two views of the coupling head then located, operator side, in said second deployed position, said movable member hinged to the frame of the coupling head along a horizontal pivot axis, being manually tilted from a retracted position illustrated in Figure 15 for which said movable member is not likely to interact with the chock of the lower support cylinder, to an extended position, illustrated in Figure 16, allowing engage with the chock (motor side) of the lower support cylinder, when returning the coupling head to the drive side,
• FIGS. 17 and 18 are two detailed views illustrating the passage of the system for clamping the chocks of the support rollers from a chock locking position to an unlocked position, releasing the axial displacement of the support rolls,
• FIG. 19 is a view illustrating the step of returning the coupling head towards the first retracted position
• - Figures 20 to 23 are respectively successive views of the detail of the return of the coupling head from the second extended position to the first retracted position
• FIG. 24 is a subsequent view of FIG. 23, illustrating the second extraction step for which the lower support cylinder is extracted by the thrust action of the coupling head, thanks to the movable member of FIGS. second coupling means which abuts against the protruding portion of the empoise motor side,
• FIG. 25 is a consecutive view of FIG. 24, the support cylinder totally extracted in said second deployed position of the coupling head;
• FIG. 26 is a subsequent view of FIG. 25 illustrating the positioning of a support element, insertable in the holding cage, whose lower part rests on the chocks of the lower support roll, and whose upper part is provided to support the chocks of the upper support roll,
• FIG. 27 is a detailed view of the coupling head, illustrating more particularly two folding elements in their deployed position, for engaging abutting with the chock (motor side) of the lower support cylinder to exercise a traction, and in order to allow insertion of the lower support roll into the roll stand,
• FIG. 28 is a view illustrating the insertion step during which the lower support cylinder and said support equipment are inserted together in the holding cage, by the traction action caused by the return of the head coupling to the motorization side the metal strip then received in an intermediate clearance of the support equipment
• FIGS. 29 and 30 are consecutive views illustrating the depositing step during which the upper support roll is deposited on the upper part of the support equipment by a descent action of said upper support roll
• FIG. 31 is a view illustrating the third extraction step during which the coupling head extracts jointly, during the thrust action of the actuator, the lower support cylinder, the support equipment and the upper support cylinder,
• FIG. 32 is a detail view of the coupling head, more particularly illustrating the folding elements in their folded position, following a manual action on the operator side, for decoupling the coupling head of said lower bearing cylinder during the return movement of the coupling head towards the motorisation side.
• Figure 33 is a successive view of Figure 32 illustrating the decoupling step of the coupling head of said lower bearing cylinder.
• the invention relates to a rolling mill 1, in particular of the Quarto type, for metal strip comprising a holding cage 2, comprising two pairs of uprights, at the two ends of the cage between which are provided a set of superimposed rolls, with substantially axes. parallel, comprising two working rolls 3,4, lower and upper, defining the passage gap, and two bearing cylinders 5,6 respectively lower and upper, intended to respectively bear on the working rolls of the opposite side to that of the passing gap.
• Each working or bearing cylinder has two ends, typically called journals, rotatably mounted, each on a bearing carried by a chock 30, 40, 50, 60.
• the rolling mill further comprises guiding means between the chocks 30, 40, 50, 60 of the rolls and the holding cage 2, according to the clamping plane.
• These guide means may comprise sliding surfaces between the chocks and the frame (in particular the uprights) of the holding cage 2.
• each chock 30 of the upper working cylinder 3 has two sliding plates 31, parallel and opposite, distributed on either side of the axis of rotation of the working roll 3, cooperating with two sliding plates 27, respectively rigidly secured to the uprights of the same pair at one end of the holding cage,
• each chock 40 of the lower work roll 4 has two sliding plates 41, parallel and opposite, distributed on either side of the axis of rotation of the working roll 4, cooperating with the sliding plates 27, respectively rigidly secured to the amounts of the same pair at one end of the holding cage.
• the two sliding plates 27 are respectively secured on the internal walls of two blocks of the camber cylinders Vc3, Vc4, themselves respectively secured by their outer wall to the two inner walls of the amounts of the same pair of studs. the cage.
• each chock 50 of the upper support cylinder 5 may have two sliding plates 51, parallel and opposite, distributed on either side of the axis of rotation of the support cylinder 5, cooperating with sliding plates 25 rigidly secured to the uprights of the same pair at one end of the holding cage, and
• each chock 60 of the lower support roll 6 may have two parallel and opposite sliding plates 61, distributed on either side of the axis of rotation of the support roll 6, cooperating with sliding plates 26 rigidly secured to the uprights of the same pair at one end of the holding cage.
• the rolling mill also comprises means for applying a clamping force between the chocks of the support rolls, typically comprising hydraulic cylinders Vs.
• hydraulic cylinders Vs which can be two in number, can be arranged in the lower part of the support cage. maintaining and respectively support the two chocks 60 of the lower support cylinder 6. According to an embodiment not shown, these cylinders Vs hydraulic can still be provided in the upper part of the support cage 2 and bear respectively on the chocks of the upper support cylinder.
• the rolling mill further comprises a system for clamping the chocks 30, 40 of the work rolls 3 and 4, and a clamping system 9 of the chocks 50, 60 of the support rollers 5, 6.
• the clamping system of the work rolls illustrated in the examples is that which was the subject of the applicant of the filing of the French patent application FR 1652265 of March 17, 2016 which allows to lock the chocks of work rolls, or otherwise to release the axial displacement of the working cylinders by the actions of opening and closing of the holding cage.
• the description of this clamping system for work rolls is not explicitly mentioned in the present application. The skilled person can, however, refer to this document for its execution. In the context of the present application, other systems for clamping the work rolls are possible and in particular that with dedicated cylinders described as state of the art in the application FR 1652265.
• the clamping system 9 of the chocks of the support cylinders to pass from a retracted state, allowing the withdrawal along their axis of the support rolls out of the holding cage to a blocking state ensuring the locking of the chocks with respect to the cage, along the axis of the cylinder, while allowing the sliding of the chocks along the guide means, according to the clamping plane.
• This clamping system 9 may comprise vertical grooves of the chocks 50, 60 of the upper support cylinder 5 and the lower support cylinder 6, as well as locking members 90, mounted to slide horizontally. Each locking member can move from a position where it enters the vertical groove of the chocks 50 or 60, blocking the axial displacement of the support cylinder, to a retracted position where the axial displacement is released. Given the maintenance frequency of the support cylinders, the clamping system can be manual, the passage from the retracted position to the locking position is manual being obtained by actuating a handle 91.
• the rolling mill further comprises motorization means 10 of the support rollers, on one side of the roll stand, said engine side in the remainder of the invention.
• an electric motor M drives the lower and upper bearing cylinders, through a transmission connecting the output of the engine to the ends of the support cylinders motor side.
• the invention is more particularly concerned with the extraction system of the work rolls and the support rolls, and which is situated on the motor side of said rolling mill.
• This extraction system makes it possible, as will be developed later, to extract the used cylinders from the roll stand, in particular with a view to their rectification, but also to insert rolled (or new) rolls in the support cage.
• the extraction system comprises:
• an actuator 70 configured to push the rolls out of the holding cage 2 of the rolling mill during the extraction of the rolls, or on the contrary pulling the rolls into the holding cage 2 during the insertion of the rolls,
• a coupling head 8 integral with said actuator 70 located in the open position of the holding cage 2, at an intermediate height level between the lower working roll 4 and the lower bearing roll 6, movable according to a direction parallel to the cylinders 3,4,5,6.
• the actuator may comprise a rack and pinion torque 71 motorized pinion 72, the frame of the coupling head 8 being rigidly secured to the distal end of the rack 71.
• the rotation of the pinion 72 in a first direction allows the translation according to its axis of the rack and the coupling head 8.
• the coupling head 8 is movable from a first retracted position PI for which the coupling head is located motor side, to a second deployed position P2 for which the headstock 8 having passed through the holding cage 2 is located operator side, accessible for them.
• said coupling head 8 comprises
• first coupling means configured to drive the chock 40 or the end of the lower working roll 4, on the motorization side of the rolling mill
• second coupling means configured to drive the chock 60 of the lower support roll 6, on the motorization side of the rolling mill: the second coupling means having a retracted state in which they do not lead the chock of the support roll; lower 6 to an expanded state in which they push the chock 60 of said lower support cylinder 6.
• the chocks 30, 40 of the upper and lower work rolls have connection means 11, on the operator side, opposite to the drive means, providing a mechanical connection 12 between these chocks on the operator side.
• This mechanical connection 12 makes it possible to ensure the joint exit of the two working rolls 3, 4 when the actuator 70 of the extraction system exerts only a thrust (motor side) on the lower working roll, and as will be explained thereafter.
• the connecting means 11 may comprise at least one blade 15 (or two blades 15) whose proximal end is integral with the one marked lower chocks or upper, received in a lateral groove, formed in the body of the chock, on the back of a sliding plate 31 or 41, and whose distal end 16 enters a groove of the other chock, on the back of the sliding plate, at least in an extended position of said blade, in said open position of the holding cage.
• the (or each) blade 15 is substantially parallel to the sliding plates 31 or 41 the distal end 16 of the blade may have a rounded contour so as to allow a slight pivoting of the distal end in the groove to be in particular observed during bending action on the work rolls.
• the blade 15 may also be provided retractable in a position retracted into the chock 30 (position not shown), the chock 30 having means for locking said blade 15 in the deployed position. These means may comprise a spring ball system.
• An oblong opening 17 of the blade intended to be traversed by a stud 18, integral with the chock may also be provided to prohibit the disassembly of the blade
• first coupling means and the second coupling means of said extraction system are configured so as to allow:
• the invention advantageously allows:
• the extraction system possibly makes it possible to extract only the work rolls, and then to insert new working rolls (new or rectified) into said holding cage (the rolls of remaining support in the support cage).
• new working rolls new or rectified
• the method of changing the rolls used in such a rolling installation is described below, and more particularly the various steps used to extract all of the work rolls and the support rollers by means of the rolling mill system. extraction with a single actuator. These different steps are illustrated in detail in Figures 6 to 33.
• the working rolls 3,4 and the support rollers 5,6 are extracted, after opening of the holding cage of said rolling mill during which the lower work roll 4 and lower support roll 6 are separated from the upper working cylinder 4 and the upper support cylinder 5, while the metal strip B is present along the scroll plane of said rolling mill.
• This step of opening the roll stand is illustrated in FIGS. 6 and 7, caused by the retraction of the hydraulic cylinders Vs. If necessary, and according to one embodiment, this opening automatically causes the declamation of the chocks 30, 40 of the working rolls 3, 4.
• a first extraction step E1 (see FIGS. 11 to 13; ) during which are extracted the upper working cylinder 3 and the lower working cylinder 4, by a pushing action of said actuator 70 on the chock 40 of the lower working cylinder 4, motor side, the coupling head 8 passing from the first retracted position PI to the second extended position P2, said upper working cylinder 3 being driven together with the lower working cylinder 4 by the mechanical link created 12, operator side, between the chocks 30, 40 of the working cylinders lower and upper, said second coupling means of the coupling head 8 being in said retracted state where they do not cause the chocks of the support cylinders during this thrust action, - A return step E2 (see Figures 19 to 24) during which the coupling head 8 is returned from the second extended position P2 towards the motor side to the first retracted position PI,
• a second extraction step E3 (see FIGS. 24 and 25) during which the lower support cylinder 6 is extracted from the holding cage 2 by a pushing action of said actuator on the chock 60 of the cylinder of lower support 6 motor side, the coupling head 8 passing from the first retracted position PI to the deployed position P2, said second coupling means being in said expanded state for driving the thrust of the chock 60 of said cylinder d lower support 6, - a positioning step E4 (see FIGS.
• a deposition step E6 (see FIGS. 29 and 30) during which the upper support roll 5 is deposited on the upper part of the support equipment 13, by a descent action of said upper support roll 5,
• a third extraction step E7 (see FIG. 31) during which is extracted the assembly comprising the lower support cylinder 6, the support equipment 13, and the said upper support cylinder 5 by a pushing action said actuator 70 on the chock 60 of the lower support cylinder 6, motor side.
• the holding cage 2 of the rolling mill typically comprises support rails R3, R4 on which the chocks 30, 40 of the upper work rolls and lower 3.4, in the open position of the holding cage 2, said support rails R3, R4 guiding the working rolls 3,4 and their chock 30,40 during the extraction of the work rolls out of said holding cage or during the insertion of the working rolls in the holding cage.
• the support cage also comprises support rails R6 on which the chocks 60 of said lower support cylinder 6 rest in the open position of the holding cage 2, the chocks 60 having rollers 63 intended to roll along the rails. R6, other rails extending the rails R6 at the extraction area operator side.
• the rolling plant may comprise a support carriage comprising support rails R3 ', R4' suitable for supporting and guiding the chocks 30, 40 of the lower and upper work rolls 3,4 which, in a relative position of trolley relative to the rolling mill, extend the support rails R3, R4 of the rolling mill and so that the lower and upper work rolls are loaded together on the carriage 20 during the actuator pushing action on the work rolls 3,4, or on the contrary unloaded from the carriage to be inserted into the holding cage during the insertion of cylinders.
• This support carriage 20 is movable along rails perpendicular to the support rails, to allow the carriage to retract laterally to a position outside the extraction zone, and as illustrated in FIG. 8.
• a handling frame M T allows to evacuate through the work rolls 3,4 from above, thanks to a crane of the workshop.
• This carriage 20 is held in this retracted position outside the extraction zone, in particular during the steps for which the support cylinders are extracted or inserted.
• the carriage may have, in parallel, four pairs of support rails, and so as to be able to support two pairs of upper work rolls, and lower, side by side.
• the work rolls 3,4 are to be changed, it is then possible to jointly extract a pair of upper and lower work rolls on the support carriage 20 and immediately load another pair of work rolls (new or rectified). ) previously positioned on the support carriage, just after a small lateral displacement of the carriage so as to align the support rails R3 'and R'4 of these new cylinders with those R3 and R4 of the holding cage 2.
• the first coupling means may essentially comprise a hook 81 rigidly secured to the coupling head 8 intended to engage with a corresponding hook 42 secured to the motor-side end of the lower work roll 4, and suitable for:
• This hook 81 is initially engaged with the corresponding hook 42 at the end of the lower work roll, in said first retracted position PI of the coupling head, and as illustrated in FIGS. 3 or 11.
• the two hooks 81 and 82 mutually engaging are configured so that the hooking and unhitching between, on the one hand, the hook 81 of the first coupling means of the coupling head 8, and on the other hand, the corresponding hook 42 of the cylinder 4, are caused by the movements of the carriage 20, in a direction perpendicular to the support rails R3 ', R4'.
• the coupling (or decoupling) of the coupling head 8 with the lower working cylinder 4 is therefore automatic thanks to the motorized movement of the support carriage, and without the need for a dedicated actuator for this action.
• the support rails R3 'and R4' of the support carriage are aligned with the support rails R3 and R4 during the first extraction step E1.
• the carriage 20 is retracted into a position outside the extraction zone, operator side, and as illustrated in FIG. 14, and while the coupling head is in the second deployed position P2, accessible to the operator.
• This access to the coupling head 8 advantageously allows, according to the invention, an operator to pass the second coupling means of the retracted state in which they do not lead the chock of the lower bearing cylinder to the deployed state in which they drive to push the chock of said lower support cylinder by a manual action of the operator on said second coupling means.
• This manual action is successive to said first extraction step, performed while the coupling head is in said second extended position accessible operator side of said rolling mill, and prior to said step of returning the coupling head.
• the second coupling means may comprise at least one movable element 82, articulated to the frame of the coupling head, suitable for cooperating with the thrust with the chock 60 of the lower support cylinder 6.
• said at least one movable element 82 in the retracted state of the second coupling means, said at least one movable element 82 is raised and locked in a retracted position P3, illustrated by way of example in FIG. 15, in which said movable element 82 does not engage with the chock 60, of the lower support cylinder 6, on the motorization side of the rolling mill, in the deployed state of the second coupling means, the at least one movable element 82 is in an extended position P4, illustrated for information in FIG. wherein said movable member 82 projects downward under the action of gravity.
• the movable member 82 can be locked in position by any suitable means, and for example by means of a fork 85, articulated to the frame, which in a position makes it possible to hold the movable member 82 in position reassembly by engagement with a tab 84 rigidly secured to the movable member.
• the unlocking is obtained by moving the fork 85 around its pivot, this displacement causing the release of the movable member which pivots upside down, for example a half-turn under the effect of gravity.
• This movable element 82 is configured in said extended position P4 to engage with a projecting portion 62 on the upper face the chock 60 of the lower support cylinder 6 motor side, present in the holding cage.
• said passage of the coupling head 8 from the second extended position P2 to the first retracted position PI causes the protrusion 62 to engage against the movable element 82, which pivots around its articulation under the action of the protruding portion 62 (see Figures 20 to 22), to escape said projecting portion 6 before returning, under the effect of gravity, in position (see Figure 23) where said movable member 82 projects to the bottom, on the other side of the projection 62.
• said movable member 82 when returning the coupling head, is configured to escape a projecting portion 62 on the upper face of the chock 60 of the cylinder lower support 6, thanks to the possibility of rotation of said at least one movable element (in the clockwise direction in Figures 21 and 22).
• said movable element 82 then in position on the other side of the projecting portion 62, abuts against said projecting portion 62 under the thrust action of the actuator 70 and so as to allow the output of said lower support cylinder 6 during the second extraction step E3.
• the possibility of rotation of said movable member 82 (counterclockwise) is blocked by a stop 86, which allows said movable member 82 to transmit to the chock 60 the thrust force necessary for the extraction of the lower support cylinder 6.
• the second coupling means may comprise, as illustrated in the figures, two movable elements 82 substantially parallel, and rigidly secured to the same rotation shaft to the frame of the head.
• the rotation shaft is substantially horizontal and perpendicular to the axis of the lower support cylinder.
• the two moving elements are intended to cooperate respectively with two projecting parts on the upper face of the chock 60 of the lower support cylinder 6.
• the lower support roll 6 is extracted from the holding cage 2, and as shown for information in FIG. 25.
• the next step is said positioning step E4 at during which is positioned by means of a handling device (ie a crane) a support equipment 13 on the lower support cylinder 6.
• a handling device ie a crane
• This support equipment 13 is notable in that it can be inserted (once the working rolls removed) in the holding cage 2, together with the lower support roll.
• the second coupling means comprise at least one folding element 83 suitable for cooperating with traction (only) with the chock 60 of the lower support cylinder 6 on the motor side, which
• said at least one folding movable element 83 may initially be in the deployed position P5 in that it does not allow to exert thrust force on the cylinder.
• the folding elements 83 may be two in number and engage in abutment with the two projecting parts 62.
• the passage from the deployed position P5 to the folded position P6 can be obtained manually, for example by rotating according to a limited angle for example of a quarter turn of said element 83.
• the or each element may have a fingerprint intended for a tool such as a key.
• the two collapsible elements in their deployed position P5 make it possible, during the insertion step E5, to jointly engage the lower support cylinder 6 in the holding cage, as well as the said support equipment 13 supported by the chocks 60, and as illustrated in FIG. 28. It will be noted that the metal strip present in the rolling plane of the rolling mill is housed in an intermediate clearance 14 of said support equipment 13.
• the coupling head 8 is cut by a manual action on the folding elements 83 which have passed into their folded position P6, then by the return of the coupling head towards the first retracted position P1.
• First coupling means (rigidly integral hook of the body of the coupling head) suitable for exerting (only) a thrust force and a traction force on the lower working cylinder 4
• Second coupling means including the manually retractable movable member 82 suitable for exerting a thrust force on the chock 60 of the lower bearing roll, and the manually folding elements 83 suitable for exerting (only) a tensile force on this chock.
• Locking member clamping system 9
• Support trolley (working cylinders)
• R3, R4, R6 Supporting rails of the holding cage suitable for guiding respectively the upper work rolls, the lower work roll, and the lower support roll.
• Vs. Hydraulic cylinders (means for applying a clamping force between the chocks of the support rolls),

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Metal Rolling (AREA)
• Bending Of Plates, Rods, And Pipes (AREA)
• Lining Or Joining Of Plastics Or The Like (AREA)

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• 2016
  • 2016-04-18 FR FR1653411A patent/FR3050128B1/fr not_active Expired - Fee Related
• 2017
  • 2017-04-14 EP EP17717717.7A patent/EP3445506B1/de active Active
  • 2017-04-14 ES ES17717717T patent/ES2839699T3/es active Active
  • 2017-04-14 WO PCT/EP2017/059057 patent/WO2017182406A1/fr active Application Filing
  • 2017-04-14 US US16/094,793 patent/US11358193B2/en active Active
  • 2017-04-14 CN CN201780029871.8A patent/CN109153054B/zh active Active

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