EP3519122A1 - Circular rolling mill with shaping rollers and method for controlling the position of a roller of such a rolling mill - Google Patents

Circular rolling mill with shaping rollers and method for controlling the position of a roller of such a rolling mill

Info

Publication number
EP3519122A1
EP3519122A1 EP17777254.8A EP17777254A EP3519122A1 EP 3519122 A1 EP3519122 A1 EP 3519122A1 EP 17777254 A EP17777254 A EP 17777254A EP 3519122 A1 EP3519122 A1 EP 3519122A1
Authority
EP
European Patent Office
Prior art keywords
rack
bar
rolling mill
roller
variable volume
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP17777254.8A
Other languages
German (de)
French (fr)
Other versions
EP3519122B1 (en
Inventor
Peter Bierhalter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Forge Pat GmbH
Original Assignee
Forge Pat GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Forge Pat GmbH filed Critical Forge Pat GmbH
Priority to PL17777254T priority Critical patent/PL3519122T3/en
Publication of EP3519122A1 publication Critical patent/EP3519122A1/en
Application granted granted Critical
Publication of EP3519122B1 publication Critical patent/EP3519122B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • B21B31/32—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis by liquid pressure, e.g. hydromechanical adjusting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H1/00—Making articles shaped as bodies of revolution
    • B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length
    • 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
    • B21B13/08—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process
    • B21B13/10—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process all axes being arranged in one plane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/48—Tension control; Compression control
    • B21B37/52—Tension control; Compression control by drive motor control

Definitions

  • the invention relates to a circular rolling mill which comprises two pairs of rollers for shaping radial faces and end faces of an annular piece.
  • rollers In this type of mill, it is known that the rollers must be moved, during operation of the rolling mill, to adapt their position to the dimensions of the part being shaped.
  • hydraulic cylinders can be used to move the rollers. This requires the availability of pressurized oil in large quantities, to the point that a relatively large hydraulic plant must be provided near the mill.
  • the invention intends to remedy more particularly by proposing a circular rolling mill in which the rollers can be moved by an electric gear motor, without it being necessary to install this electric gearmotor on a pivoting support.
  • the invention relates to a circular rolling mill comprising a fixed main frame, a pair of cylindrical rollers, respectively internal and external, intended to shape the inner and outer radial faces of an annular piece and supported by a first auxiliary frame mounted on the main frame, and a pair of upper and lower tapered rollers respectively for shaping opposite end faces of the workpiece and supported by a second auxiliary frame mounted on the main frame.
  • At least one rack and pinion assembly is provided for translational movement of a roll with respect to the auxiliary frame which supports it and at least one electric gear motor for driving the pinion of this rack and pinion assembly.
  • the electric geared motor is mounted fixedly relative to one of the auxiliary chassis, while a fluidic discharge mechanism is interposed in a power transmission kinematic chain between the rack and the roller moved by this rack.
  • the fluidic discharge mechanism comprises at least one chamber of variable volume supplied with pressurized fluid and whose volume varies according to the relative position of the roller and the rack.
  • the mounting mode of the motor makes it possible to constitute a fixed point, which allows precise steering of the rack and pinion assembly, and therefore of the position of the associated roller.
  • the fluidic discharge mechanism makes it possible to absorb the transient overload transmitted to the drive train, without the rack being moved, thus without risk of damaging the electric geared motor.
  • such a mill may incorporate one or more of the following features, taken in any technically permissible combination:
  • the kinematic chain comprises a roller transmission bar of a moving movement of the rack along a longitudinal axis of the bar and the variable volume chamber is defined between
  • variable volume chamber is defined inside the bar.
  • variable volume chamber is defined, along the longitudinal axis of the bar, between the rack and the bar.
  • the rolling mill comprises a supply system of the variable volume chamber fluid at a pressure greater than or equal to 100 bar, preferably greater than or equal to 200 bar, more preferably of the order of 250 bar.
  • the kinematic chain is configured so that, in case of irregularity projecting from the surface of an annular piece shaped by the roller, the displacement induced by this irregularity on the bar tends to drive the pressurized fluid from the volume chamber. variable, by reducing its volume.
  • the fluidic discharge mechanism comprises a piston secured to the rack and a face defines the variable volume chamber.
  • the piston is slidably mounted inside the bar, along the longitudinal axis of the bar.
  • the piston is secured to the rack by means of a rack support and a connecting rod between the rack support and the piston, the rack support and the connecting rod being also slidably mounted to the inside the bar, along the longitudinal axis of the bar.
  • the rolling mill comprises guide members in translation, along the longitudinal axis of the bar, the rack support and / or the connecting rod, inside the bar, including guide pads.
  • variable volume chamber is defined between the piston face and a cover that closes an internal volume of the bar, opposite the roller.
  • a portion of the bar is sealed in an internal cavity defined by the rack and the variable volume chamber is formed by the portion of this cavity not occupied by the bar.
  • variable volume chamber is connected to the pressurized fluid supply system through a conduit through the rack.
  • Each roller movable in translation relative to a secondary chassis is moved by a rack and pinion assembly driven by an electric gear motor mounted fixedly with respect to this frame, with the interposition of a fluidic discharge mechanism in the kinematic chain transmission of effort between each rack and the roller driven by this rack.
  • the invention relates to a method for controlling the position of at least one forming roll of a face of a part to be conformed within a circular rolling mill which comprises a fixed main frame, a pair of rollers, respectively internal and external, for shaping inner and outer radial faces of this part and supported by a first auxiliary frame mounted on the main frame, and a pair of conical rollers, respectively upper and lower, for shaping opposite end faces of the part and supported by a second auxiliary frame mounted on the main frame, this mill also comprising at least one rack and pinion assembly for moving a roller relative to the auxiliary frame that supports it and at least one motorcycle gear reduction motor of the pinion of this rack and pinion assembly.
  • this method comprises steps of;
  • FIG. 1 is a perspective view of a rolling mill according to the invention.
  • FIG. 2 is a longitudinal sectional view of the mill, according to the plane II in Figure 1;
  • FIG. 3 is an enlarged view of detail III in FIG. 1 when the mill is in first a normal operating configuration; for clarity of the drawing, some support plates and a geared motor are omitted in this figure 3 and some bars are shown partially torn off;
  • FIG. 4 is an enlarged view of detail IV in FIG. 3;
  • FIG. 5 is a top view corresponding to detail IV;
  • Figure 6 is a view similar to Figure 4 when the rolling mill is in a second operating configuration, in case of irregularity on a radial surface of a workpiece being formed within the rolling mill;
  • FIG. 7 is a view from above corresponding to the detail of FIG. 6;
  • FIG. 8 is an enlarged view of detail VIII in FIG. 1 in which a guide plate is partially omitted for clarity of the drawing;
  • FIG. 9 is an elevational view in the direction of the arrow IX in Figure 8 when the mill is in a first normal operating configuration; for the sake of clarity, the guide plate is completely omitted and
  • Figure 10 is seen similar to Figure 9 when the rolling mill is in a third operating configuration, in case of irregularity on a front surface of a workpiece being shaped in the rolling mill.
  • the rolling mill 2 shown in Figures 1 to 10 comprises a fixed main frame 4 which defines a longitudinal axis X2 of the rolling mill 2.
  • the frame 2 supports a radial cage 6 which is fixedly mounted on the frame, and an axial cage 8 mobile relative to the chassis 4, along the axis X2.
  • a first auxiliary frame 46 is fixedly mounted on the main frame 4 and constitutes the frame of the radial cage 6.
  • a second auxiliary frame 48 is mounted on the main frame 4 while being movable along the axis X2 relative to to this main frame.
  • the auxiliary frame 48 constitutes the frame of the axial cage 8.
  • P a part being shaped in the rolling mill 2. This part is centered on a vertical axis XP and perpendicular to the axis X2.
  • P2 and P4 are respectively denoted by the inner and outer radial surfaces of the piece P.
  • P6 and P8 are noted on the upper and lower end surfaces of this piece P, when it is in place in the rolling mill 2.
  • the frame 46 of the radial cage 6 supports a cylindrical main roller 62 rotatably mounted about a vertical axis Z62 and driven in rotation by a main electric motor 64.
  • the main roller 62 is mounted in the radial cage 6 to bear against the external radial surface P4 of the piece P.
  • the frame 46 of the radial cage 6 also supports a cylindrical secondary roller or mandrel 66 rotatably mounted about a vertical axis Z66 parallel to the axis Z62.
  • the secondary roller 66 is supported by a cross member 68 which is movable, parallel to the axis X2, relative to the secondary frame 46 of the radial cage 6.
  • the cross member 68 is integral with two bars 72 and 74 which are 'each extend in a direction parallel to the axis X2.
  • the rollers 62 and 66 are solid and circular in section.
  • a plate 70 is mounted below the cross member 68 and provided with a housing 70A for receiving the lower part of the secondary roller 66.
  • This plate 70 is also movable relative to the auxiliary frame 46 being supported by two bars 76 and 78.
  • X78, X74, X76 and X78 are respectively denoted by the longitudinal axes of the bars
  • the radial cage 6 also comprises two centering arms of the part P, only one of these centering arms being visible in FIG. 1 with the reference 65.
  • a lifting system with racks 77 and 79 makes it possible to lift the cross-member 68 during the positioning of the piece P in the rolling mill 2, and then to lower it to introduce the lower part of the secondary roller 66 into the housing 70A of the tray 70.
  • the geared motor 172 includes an electric motor 172A and a reducer
  • the other geared motors have the same structure, each with an electric motor associated with a reducer.
  • the bars 72 to 78 make it possible to transmit to the roller 66 a movement movement, parallel to the axis X2 and to each of the axes X72 to X78, generated by the geared motors 172 to 178.
  • Each geared motor 172 to 178 is fixedly mounted relative to the auxiliary frame 46 of the radial cage 6.
  • the geared motor 172 is rigidly supported by a plate 46A belonging to the auxiliary frame 46.
  • geared motor 174 is rigidly supported by a plate 46B belonging to the auxiliary frame 46.
  • the geared motors 176 and 178 are supported by plates 46C and 46D of the auxiliary frame 46.
  • the plates 46A and 46B are omitted.
  • Figures 3 to 7. Note in Figure 1 that they also support the geared motors 163 and 165. However, this is not mandatory.
  • the part P is compressed radially between the rollers 62 and 66 which are rotated around the axes Z62 and Z66, directly by the motor 64, for the roller 62, and indirectly through the piece P, for the roll 66.
  • a rack and pinion assembly is used to transmit a movement of each geared motor 172 to 178 to the secondary roller or mandrel 66 to control the position of the roller in translation along the axis X2.
  • a pinion 273 is mounted on the output shaft of the reducer 172B. This pinion 273 cooperates with a rack 272 mounted on the bar 72.
  • the mounting of the rack 272 on the bar 72 is rigid in the normal configuration of use of the rolling mill 2.
  • This assembly however comprises a degree of freedom, which can be implemented in case of irregularity on the surface P2 of the piece P in a sense that a protruding relief present on this surface P2 tends to move the secondary roller or mandrel 66 towards the axis XP.
  • a degree of freedom is implemented in the assembly of the rack 272 on the bar 72 when an irregularity results from a protruding projection on the surface P4 which tends to push the piece P and the secondary roller 66 in the direction of the axis XP, by reaction against the main roller 62 whose axis Z62 is fixed relative to the auxiliary frame 46.
  • a fluidic discharge mechanism M72 is integrated in the bar 72 and makes it possible to allow a relative displacement, along the axis X72, between the roller 62 and the rack 272, plus precisely between the rack 272 and the bar 72 which is rigidly fixed to the roll 66, along the axis X2, through the cross member 68.
  • the mechanism M72 comprises a support 720 rigidly connected to the rack 272, for example by screws not shown.
  • This support 720 is received in a housing 722 formed inside the bar 72, with an axial length L722, measured parallel to the axis X72, which is greater than the axial length L720 of the support 720, also measured parallel to this axis. axis.
  • the mechanism M72 also comprises a piston 724 which is arranged in a terminal housing 726 formed at the end 72A of the bar 72 which is opposite to the cross member 68, therefore to the secondary roller 66.
  • the terminal housing 726 is closed by a cover 728 rigidly fixed to the bar 72.
  • the mechanism M72 also comprises a rod 723 connecting the support 720 and the piston 724.
  • the compression of the rod 723 between the support 720 and the piston 724 creates between the parts 720, 723 and 724 a rigid connection in translation parallel to the axis X72 when the support moves the piston to the right in Figure 5 or when the piston moves the support to the left in this figure.
  • the parts 72, 272, 720, 723 and 724 are made of metal, for example steel. Guiding shoes 727, for example bronze, are provided on the support 720 to guide it inside the housing 722 and facilitate its sliding. Similarly, guide rings 729, for example copper, are provided around the rod 723, inside the channel 725. Alternatively, only the pads 727 or pads 729 are provided.
  • the piston 724 is equipped with seals 724A which allow it to isolate a portion of the terminal housing 726, located between its face 724B turned towards the cover 728 and this cover, channel 725.
  • seals 724A which allow it to isolate a portion of the terminal housing 726, located between its face 724B turned towards the cover 728 and this cover, channel 725.
  • a variable volume chamber C72 is defined in the terminal housing 726, between the face 724B of the piston 724 and the cover 728.
  • This variable volume chamber C72 is supplied with pressurized oil through a port 728A of the cover 728 and a conduit 732 which belongs to a system 73 for supplying the chamber C72 with oil under pressure, with a pressure greater than 100 bar.
  • the pressure delivered by the system 73 is chosen to be greater than 200 bar, preferably of the order of 250 bar.
  • the system 73 may comprise, as shown diagrammatically in FIGS. 3, 5 and 7, a pump 734 which delivers the oil to the set pressure, by drawing it from a tank 736, while a calibrated check valve 738 connects the conduit 732 to the tray 736.
  • the system 73 makes it possible to deliver oil inside the chamber C72 at a pressure equal to the outlet pressure of the pump 734.
  • the valve 738 is preferably calibrated in such a way that, if the pressure in the chamber C72 and in the conduit 732 exceeds the outlet pressure of the pump 734, the oil in the conduit 732 is returned to the tray 736, through this valve.
  • the system 73 is a system known in the hydraulic field. Given the volume of oil it contains, of the order of one or two liters, it is much easier to implement and much less expensive than the plants conventionally used in rolling mills to feed jacks intended for move the conformation rollers.
  • the discharge mechanism M72 comprises the bar 72 as well as the parts and volumes 720 to 729.
  • the pressure of the oil present in the chamber C72 is sufficient to stiffen the kinematic connection between the rack 272 and the bar 72, therefore between the rack 272 and the secondary roller 66, in normal operation of the rolling mill 2.
  • the bars 74, 76 and 78 are also connected to the motors 174, 176 and 178 by kinematic chains which each include a fluidic discharge mechanism of the M72 mechanism type, the mechanism M74 used for the bar 74 being visible in FIG. 3, while the corresponding mechanisms M76 and M78 used for the bars 76 and 78 are masked by the plates 46C and 46D.
  • the discharge mechanism M74 is inserted between, on the one hand, an assembly comprising a pinion 275 and a rack 274 and, on the other hand, the cross-member 68, via the bar 74.
  • the mechanisms M76 and M78 are inserted between, on the one hand, the rack-and-rack assemblies mounted on the bottom of the geared motors 176 and 178 and, on the other hand, the plate 70.
  • the rolling mill is in the configuration of Figures 3 to 5.
  • the secondary roller 66 is temporarily displaced towards the axis XP, which causes the displacement of the cross member 68 and the plate 70 in the same direction. direction, to the left in Figure 2.
  • the bar 72 Under the effect of the temporary displacement of the crosspiece 68, the bar 72 is moved roughly towards the axial cage 8, in the direction of the arrow F1 in FIG. 7. It is necessary to prevent this movement from being transmitted to the geared motor 172, to limit the risk of breakage and premature wear of this material.
  • This movement of the bar 72 is transmitted to the cover 728, which has the effect of increasing the oil pressure within the variable volume chamber C72. This increase in pressure results in the ejection of the oil from the chamber C72 to the supply system 73, through the orifice 728A.
  • the pressure of the oil exiting the chamber C72 is greater than the outlet pressure of the pump 734 and the oil, blocked by the non-return valve 739, flows back to the tank 736, through the valve 738, as represented by the arrow F2 in FIG. 7.
  • the discharge mechanism M72 allows a relative movement of the rack 272 and the bar 72, which avoids transmitting to the pinion 273 and, through it, to the geared motor 172 a violent acceleration likely to damage the 172A motor and / or the reducer 172B.
  • the discharge mechanism M72 thus constitutes a mechanism for protecting the electric motor 172A, the gearbox 172B and the rack and pinion assembly 272-273 against violent accelerations that may result from surface irregularities of the piece P during operation. conformation in the mill 2.
  • FIGS. 5 and 7 make it possible to observe that, even if the bar 71 has moved to the left, in the direction of the arrow F1, the rack 272 and the pinion 273 have retained their positions, because of the reduction. the volume of room C72.
  • the axial cage 8 comprises two conical rollers 82 and 84 intended to act respectively on the upper front surface P6 and on the lower front surface P8 of the part P.
  • the tapered rollers 82 and 84 are each rotated by an electric motor 86 or 88 and supported by the auxiliary frame 48.
  • the roller 82 is supported by a plate 90 which is vertically movable, along an axis Z90 parallel to the axes Z62 and Z66, with respect to the secondary frame 48.
  • the plate 90 is rigidly fixed to a shoe 91, which itself is coupled to the lower end 92A of a bar or column 92.
  • the bar 92 makes it possible to transmit to the roller 82 a displacement movement in translation along its longitudinal axis X92 coincides with the axis Z90.
  • the displacement of the bar 92 along the axis Z90 is controlled by a rack with double toothing 292, itself controlled by two geared motors 192 and 194 fixedly mounted on the frame 48.
  • Sprockets 293 and 295 are respectively mounted on the Output shafts of the geared motors 192 and 194 and mesh simultaneously with the two teeth provided, on either side of the axis Z90, on the rack 292.
  • the rack is guided in translation along the axis Z90 by rails formed in guide plates 197 and 199, the plate 199 being partially cut away from FIG. 8 and completely withdrawn in FIGS. 9 and 10, for the sake of clarity of the drawings.
  • the plates 197 and 199 are part of the auxiliary frame 48.
  • the geared motors 192 and 194 are attached to the frame 48 through the plate 197.
  • the upper end of the bar 92 forms a piston 924 which is sealingly engaged by a seal 924A, in a hollow housing 926 formed in the lower part of the rack 292, in the center thereof.
  • a conduit 291 passes through the rack 292 over its entire height, from the housing 926, which allows to connect the chamber C92 to a 93 power supply system this chamber in oil under pressure.
  • the system 93 comprises a conduit 932, a pump 934, a recovery tank 936, a calibrated check valve 938 and a check valve 739.
  • the power supply system 93 may or may not be identical to the power supply system 73. These systems may be confused.
  • the pressure in the chamber C92 is sufficient for the kinematic connection between the rack 292 and the upper conical roller 82 to be rigid, which makes it possible to precisely control the height of the this roll.
  • the roller 82 In the event of a protruding irregularity on the upper front surface P6 or on the lower front surface, the roller 82 is moved upwards in the direction of the arrow F3 in FIG. 10, which results in a vertical translation towards the top of the plate 90, the shoe 91 and the bar 92. This has the effect of driving the oil present in the chamber C92 to the system 93, so to the tray 936 through the valve 938, as explained above. above about the bar 72 and the feed system 73, which represents the arrow F4.
  • the systems 73 and 93 can be replaced by other systems for feeding the chambers of variable volume C72, C74, C92, etc. to oil under pressure at a given pressure.
  • an accumulator tank loaded with oil at the desired pressure and associated with a calibrated discharge valve, or a booster chamber.
  • the rod 273 is rigidly connected to the support 720 and the piston 724, which makes it possible to draw oil into the feeding chamber, like a syringe, before put the variable volume chamber C72 or equivalent under a pressure of the order of 250 bar by pushing the piston 724, after cutting the communication between this chamber and the booster chamber.
  • the invention is implemented to control the displacement, in translation vis-à-vis the frames 46 and 48, of the rollers 66 and 82. Alternatively, it can be used for a single of these rollers.
  • the bars 72 and 74, on the one hand, and the bars 76 and 78, on the other hand, can be interconnected by rear crosspieces arranged opposite the crossbar. 68 and the plate 70.
  • a rack and pinion assembly driven by one or more geared motors can be provided to control the movement of each rear cross member along the axis X2.
  • the structure of the rack and pinion assembly mounted on the auxiliary frame 46 can be inspired from that shown in the figures for the axial cage 8, with an equivalent of the bar 92 which is arranged horizontally and which attacks each rear cross member in one direction. spacing relative to the axis Z62 of the main roller 62.
  • a single rack and pinion assembly is used to move the two rear cross members and, through them, the four columns.
  • a single crossbar connects the four bars 72 to 78.
  • the number of drawbars used to control the translation of the roll 66 along the axis X2 may be different from four.

Abstract

This circular rolling mill (2) comprises a fixed main frame (4), a pair of cylindrical rollers (62), respectively internal and external, intended to shape internal and external radial faces of an annular part (P) and supported by a first secondary frame (46) mounted on the main frame, as well as a pair of conical rollers (82, 84), respectively upper and lower, intended to shape opposite front faces of the part (P) and supported by a second secondary frame (48) mounted on the main frame. At least one rack and pinion assembly (272-273, 274-275) is provided to move a roller in translation relative to one of the secondary frames (44, 48). At least one electric geared motor (172, 176, 178) is provided to drive the pinion (273, 275) of the rack and pinion assembly. The electric geared motor (172-178) is fixedly mounted relative to one of the auxiliary frames (46, 48). A fluid discharge mechanism (M72, M74) is interposed in a kinematic chain for transmitting force between the rack (272, 274) and the roller moved by this rack. The fluid discharge mechanism (M72, M74) comprises at least one variable volume chamber (C72, C74), which is supplied with pressurised fluid (73) and the volume of which varies as a function of the relative position of the roller and of the rack (272, 274).

Description

Laminoir circulaire avec rouleaux de conformation et procédé de contrôle de la position d'un rouleau d'un tel laminoir  Circular rolling mill with conformation rollers and method for controlling the position of a roll of such a rolling mill
L'invention a trait à un laminoir circulaire qui comprend deux paires de rouleaux destinées à façonner des faces radiales et des faces frontales d'une pièce annulaire. The invention relates to a circular rolling mill which comprises two pairs of rollers for shaping radial faces and end faces of an annular piece.
Dans ce type de laminoir, il est connu que les rouleaux doivent être déplacés, en cours de fonctionnement du laminoir, pour adapter leur position aux dimensions de la pièce en cours de conformation. De façon classique, des vérins hydrauliques peuvent être utilisés pour déplacer les rouleaux. Ceci impose de disposer d'huile sous pression en quantité importante, au point qu'une centrale hydraulique relativement volumineuse doit être prévue à proximité du laminoir.  In this type of mill, it is known that the rollers must be moved, during operation of the rolling mill, to adapt their position to the dimensions of the part being shaped. Conventionally, hydraulic cylinders can be used to move the rollers. This requires the availability of pressurized oil in large quantities, to the point that a relatively large hydraulic plant must be provided near the mill.
Pour pallier ce problème, il est connu de WO-A-2009/125102 d'utiliser, pour déplacer des rouleaux d'un laminoir circulaire, des ensembles pignons-crémaillères dont le pignon est entraîné en rotation par l'arbre de sortie d'un moto-réducteur électrique. Pour limiter les risques de casse en cas d'irrégularité de la surface avec laquelle interagit un rouleau, il est prévu de monter le moto-réducteur électrique sur un support, lui-même articulé autour de l'axe de rotation du pignon, par rapport à un châssis du laminoir. En outre, des moyens d'amortissement sont prévus pour amortir le pivotement du support. Le montage du moto-réducteur électrique sur un support articulé complexifie le laminoir, ce qui augmente son prix de revient et entraîne des opérations de maintenance supplémentaires.  To overcome this problem, it is known from WO-A-2009/125102 to use, for moving rollers of a circular rolling mill, rack and pinion assemblies whose pinion is driven in rotation by the output shaft of an electric geared motor. To limit the risk of breakage in case of irregularity of the surface with which a roller interacts, it is planned to mount the electric gear motor on a support, itself articulated around the axis of rotation of the pinion, relative to a frame of the rolling mill. In addition, damping means are provided for damping the pivoting of the support. Mounting the electric gear motor on an articulated support makes the rolling mill more complex, which increases its cost price and entails additional maintenance operations.
C'est à ces inconvénients qu'entend plus particulièrement remédier l'invention en proposant un laminoir circulaire dans lequel les rouleaux peuvent être déplacés par un moto-réducteur électrique, sans qu'il soit nécessaire d'installer ce mot-réducteur électrique sur un support pivotant.  It is these drawbacks that the invention intends to remedy more particularly by proposing a circular rolling mill in which the rollers can be moved by an electric gear motor, without it being necessary to install this electric gearmotor on a pivoting support.
A cet effet, l'invention concerne un laminoir circulaire comprenant un châssis principal fixe, une paire de rouleaux cylindriques, respectivement interne et externe, destinés à façonner des faces radiales interne et externe d'une pièce annulaire et supportés par un premier châssis auxiliaire monté sur le châssis principal, et une paire de rouleaux coniques, respectivement supérieur et inférieur, destinés à façonner des faces frontales opposées de la pièce et supportés par un deuxième châssis auxiliaire monté sur le châssis principal. Il est prévu au moins un ensemble pignon-crémaillère de déplacement en translation d'un rouleau par rapport au châssis auxiliaire qui le supporte et au moins un moto-réducteur électrique d'entraînement du pignon de cet ensemble pignon-crémaillère. Conformément à l'invention, le moto-réducteur électrique est monté de façon fixe par rapport à l'un des châssis auxiliaires, alors qu'un mécanisme à décharge fluidique est intercalé dans une chaîne cinématique de transmission d'effort entre la crémaillère et le rouleau déplacé par cette crémaillère. En outre, le mécanisme à décharge fluidique comprend au moins une chambre de volume variable alimentée en fluide sous pression et dont le volume varie en fonction de la position relative du rouleau et de la crémaillère. For this purpose, the invention relates to a circular rolling mill comprising a fixed main frame, a pair of cylindrical rollers, respectively internal and external, intended to shape the inner and outer radial faces of an annular piece and supported by a first auxiliary frame mounted on the main frame, and a pair of upper and lower tapered rollers respectively for shaping opposite end faces of the workpiece and supported by a second auxiliary frame mounted on the main frame. At least one rack and pinion assembly is provided for translational movement of a roll with respect to the auxiliary frame which supports it and at least one electric gear motor for driving the pinion of this rack and pinion assembly. According to the invention, the electric geared motor is mounted fixedly relative to one of the auxiliary chassis, while a fluidic discharge mechanism is interposed in a power transmission kinematic chain between the rack and the roller moved by this rack. In addition, the fluidic discharge mechanism comprises at least one chamber of variable volume supplied with pressurized fluid and whose volume varies according to the relative position of the roller and the rack.
Grâce à l'invention, le fait que le moto-réducteur électrique est monté de façon fixe par rapport au châssis principal ou secondaire simplifie la structure générale du laminoir. En fonctionnement normal, le mode de montage du moteur permet de constituer un point fixe, ce qui autorise un pilotage précis de l'ensemble pignon-crémaillère, donc de la position du rouleau associé. En cas d'irrégularité sur la surface façonnée par le rouleau, le mécanisme à décharge fluidique permet d'absorber la surcharge transitoire transmise à la chaîne cinématique, sans que la crémaillère soit déplacée, donc sans risque d'endommager le moto-réducteur électrique.  Thanks to the invention, the fact that the electric gear motor is fixedly mounted relative to the main or secondary frame simplifies the general structure of the rolling mill. In normal operation, the mounting mode of the motor makes it possible to constitute a fixed point, which allows precise steering of the rack and pinion assembly, and therefore of the position of the associated roller. In the event of an irregularity on the surface formed by the roller, the fluidic discharge mechanism makes it possible to absorb the transient overload transmitted to the drive train, without the rack being moved, thus without risk of damaging the electric geared motor.
Selon des aspects avantageux mais non obligatoires de l'invention, un tel laminoir peut incorporer une ou plusieurs des caractéristiques suivantes, prises dans toute combinaison techniquement admissible :  According to advantageous but non-obligatory aspects of the invention, such a mill may incorporate one or more of the following features, taken in any technically permissible combination:
- La chaîne cinématique comprend une barre de transmission au rouleau d'un mouvement de déplacement de la crémaillère selon un axe longitudinal de la barre et la chambre de volume variable est définie entre  - The kinematic chain comprises a roller transmission bar of a moving movement of the rack along a longitudinal axis of the bar and the variable volume chamber is defined between
• d'une part la barre ou une pièce solidarisée à la barre ; et  • on the one hand the bar or a piece secured to the bar; and
• d'autre part, la crémaillère ou une pièce rigidement fixée à la crémaillère. • On the other hand, the rack or a piece rigidly fixed to the rack.
- La chambre de volume variable est définie à l'intérieur de la barre. - The variable volume chamber is defined inside the bar.
- En variante, la chambre de volume variable est définie, selon l'axe longitudinal de la barre, entre la crémaillère et la barre.  Alternatively, the variable volume chamber is defined, along the longitudinal axis of the bar, between the rack and the bar.
- Le laminoir comprend un système d'alimentation de la chambre de volume variable en fluide sous une pression supérieure ou égale à 100 bars, de préférence supérieure ou égale à 200 bars, de préférence encore de l'ordre de 250 bars.  - The rolling mill comprises a supply system of the variable volume chamber fluid at a pressure greater than or equal to 100 bar, preferably greater than or equal to 200 bar, more preferably of the order of 250 bar.
- La chaîne cinématique est configurée pour que, en cas d'irrégularité en saillie sur la surface d'une pièce annulaire façonnée par le rouleau, le déplacement induit par cette irrégularité sur la barre tend à chasser le fluide sous pression de la chambre de volume variable, par réduction de son volume.  - The kinematic chain is configured so that, in case of irregularity projecting from the surface of an annular piece shaped by the roller, the displacement induced by this irregularity on the bar tends to drive the pressurized fluid from the volume chamber. variable, by reducing its volume.
- Le mécanisme à décharge fluidique comprend un piston solidarisé à la crémaillère et dont une face définit la chambre de volume variable. - Le piston est monté coulissant à l'intérieur de la barre, selon l'axe longitudinal de la barre. - The fluidic discharge mechanism comprises a piston secured to the rack and a face defines the variable volume chamber. - The piston is slidably mounted inside the bar, along the longitudinal axis of the bar.
- Le piston est solidarisé à la crémaillère par l'intermédiaire d'un support de crémaillère et d'une tige de liaison entre le support de crémaillère et le piston, le support de crémaillère et la tige de liaison étant également montés coulissants à l'intérieur de la barre, selon l'axe longitudinal de la barre.  - The piston is secured to the rack by means of a rack support and a connecting rod between the rack support and the piston, the rack support and the connecting rod being also slidably mounted to the inside the bar, along the longitudinal axis of the bar.
- Le laminoir comprend des organes de guidage en translation, selon l'axe longitudinal de la barre, du support de crémaillère et/ou de la tige de liaison, à l'intérieur de la barre, notamment des patins de guidage.  - The rolling mill comprises guide members in translation, along the longitudinal axis of the bar, the rack support and / or the connecting rod, inside the bar, including guide pads.
- La chambre de volume variable est définie entre la face du piston et un couvercle qui obture un volume interne de la barre, à l'opposé du rouleau.  - The variable volume chamber is defined between the piston face and a cover that closes an internal volume of the bar, opposite the roller.
- En variante, une partie de la barre est reçue de façon étanche dans une cavité interne définie par la crémaillère et la chambre de volume variable est formée par la portion de cette cavité non occupée par la barre.  - Alternatively, a portion of the bar is sealed in an internal cavity defined by the rack and the variable volume chamber is formed by the portion of this cavity not occupied by the bar.
- La chambre de volume variable est reliée au système d'alimentation en fluide sous pression par un conduit qui traverse la crémaillère.  - The variable volume chamber is connected to the pressurized fluid supply system through a conduit through the rack.
- Chaque rouleau mobile en translation par rapport à un châssis secondaire est déplacé par un ensemble pignon-crémaillère entraîné par un moto-réducteur électrique monté de façon fixe par rapport à ce châssis, avec interposition d'un mécanisme à décharge fluidique dans la chaîne cinématique de transmission d'effort entre chaque crémaillère et le rouleau entraîné par cette crémaillère.  - Each roller movable in translation relative to a secondary chassis is moved by a rack and pinion assembly driven by an electric gear motor mounted fixedly with respect to this frame, with the interposition of a fluidic discharge mechanism in the kinematic chain transmission of effort between each rack and the roller driven by this rack.
Selon un autre aspect, l'invention concerne un procédé de contrôle de la position d'au moins un rouleau de façonnage d'une face d'une pièce à conformer au sein d'un laminoir circulaire qui comprend un châssis principal fixe, une paire de rouleaux, respectivement interne et externe, destinés à façonner des faces radiales interne et externe de cette pièce et supportés par un premier châssis auxiliaire monté sur le châssis principal, ainsi qu'une paire de rouleaux coniques, respectivement supérieur et inférieur, destinée à façonner des faces frontales opposées de la pièce et supportés par un second châssis auxiliaire monté sur le châssis principal, ce laminoir comprenant également au moins un ensemble pignon-crémaillère de déplacement d'un rouleau par rapport au châssis auxiliaire qui le supporte et au moins un moto-réducteur électrique d'entraînement du pignon de cet ensemble pignon-crémaillère. Conformément à l'invention, ce procédé comprend des étapes consistant à ;  According to another aspect, the invention relates to a method for controlling the position of at least one forming roll of a face of a part to be conformed within a circular rolling mill which comprises a fixed main frame, a pair of rollers, respectively internal and external, for shaping inner and outer radial faces of this part and supported by a first auxiliary frame mounted on the main frame, and a pair of conical rollers, respectively upper and lower, for shaping opposite end faces of the part and supported by a second auxiliary frame mounted on the main frame, this mill also comprising at least one rack and pinion assembly for moving a roller relative to the auxiliary frame that supports it and at least one motorcycle gear reduction motor of the pinion of this rack and pinion assembly. According to the invention, this method comprises steps of;
a) alimenter en fluide sous pression une chambre de volume variable intégrée à un mécanisme de décharge intercalé dans une chaîne cinématique de transmission d'effort entre la crémaillère et le rouleau déplacé par cette crémaillère, pour rigidifier cette chaîne cinématique en fonctionnement normal du laminoir, et b) évacuer une partie au moins du fluide sous pression de la chambre de volume variable, grâce à une variation dimensionnelle de la chaîne cinématique, en cas d'irrégularité sur la face de la pièce à conformer façonnée par le rouleau. a) supplying fluid under pressure to a variable volume chamber integrated into a discharge mechanism interposed in a transmission kinematic chain of force between the rack and the roller moved by this rack, to stiffen the kinematic chain during normal operation of the rolling mill, and b) evacuate at least a portion of the fluid under pressure from the chamber of variable volume, thanks to a dimensional variation of the kinematic chain, in case of irregularity on the face of the workpiece shaped by the roller.
L'invention sera mieux comprise et d'autres avantages de celle-ci apparaîtront plus clairement à la lumière de la description qui va suivre, d'un mode de réalisation d'un laminoir et d'un procédé de contrôle conformes à son principe, donnée uniquement à titre d'exemple et faite en référence aux dessins annexés, dans lesquels :  The invention will be better understood and other advantages thereof will appear more clearly in the light of the description which follows, an embodiment of a rolling mill and a control method according to its principle, given only by way of example and with reference to the accompanying drawings, in which:
- la figure 1 est une vue en perspective d'un laminoir conforme à l'invention ;  - Figure 1 is a perspective view of a rolling mill according to the invention;
- la figure 2 est une coupe longitudinale de principe du laminoir, selon le plan II à la figure 1 ;  - Figure 2 is a longitudinal sectional view of the mill, according to the plane II in Figure 1;
- la figure 3 est une vue à plus grande échelle du détail III à la figure 1 lorsque le laminoir est dans première une configuration de fonctionnement normal ; pour la clarté du dessin, certaines plaques supports et un moto-réducteur sont omis sur cette figure 3 et certaines barres sont représentées partiellement arrachées ;  FIG. 3 is an enlarged view of detail III in FIG. 1 when the mill is in first a normal operating configuration; for clarity of the drawing, some support plates and a geared motor are omitted in this figure 3 and some bars are shown partially torn off;
- la figure 4 est une vue à plus grande échelle du détail IV à la figure 3 ;  FIG. 4 is an enlarged view of detail IV in FIG. 3;
- la figure 5 est une vue de dessus correspondant au détail IV ;  - Figure 5 is a top view corresponding to detail IV;
- la figure 6 est une vue analogue à la figure 4 lorsque le laminoir est dans une deuxième configuration de fonctionnement, en cas d'irrégularité sur une surface radiale d'une pièce en cours de façonnage au sein du laminoir ;  - Figure 6 is a view similar to Figure 4 when the rolling mill is in a second operating configuration, in case of irregularity on a radial surface of a workpiece being formed within the rolling mill;
- la figure 7 est une vue de dessus correspondant au détail de la figure 6 ;  FIG. 7 is a view from above corresponding to the detail of FIG. 6;
- la figure 8 est une vue à plus grande échelle du détail VIII à la figure 1 dans laquelle une plaque de guidage est partiellement omise pour la clarté du dessin ;  FIG. 8 is an enlarged view of detail VIII in FIG. 1 in which a guide plate is partially omitted for clarity of the drawing;
- la figure 9 est une vue en élévation dans le sens de la flèche IX à la figure 8 lorsque le laminoir est dans une première configuration normale de fonctionnement ; pour la clarté du dessin, la plaque de guidage est totalement omise et  - Figure 9 is an elevational view in the direction of the arrow IX in Figure 8 when the mill is in a first normal operating configuration; for the sake of clarity, the guide plate is completely omitted and
- la figure 10 est vue analogue à la figure 9 lorsque le laminoir est dans une troisième configuration de fonctionnement, en cas d'irrégularité sur une surface frontale d'une pièce en cours de conformation dans le laminoir.  - Figure 10 is seen similar to Figure 9 when the rolling mill is in a third operating configuration, in case of irregularity on a front surface of a workpiece being shaped in the rolling mill.
Le laminoir 2 représenté sur les figures 1 à 10 comprend un châssis principal fixe 4 qui définit un axe longitudinal X2 du laminoir 2. Le châssis 2 supporte une cage radiale 6 qui est montée de façon fixe sur ce châssis, ainsi qu'une cage axiale 8 mobile par rapport au châssis 4, selon l'axe X2. Un premier châssis auxiliaire 46 est monté de façon fixe sur le châssis principal 4 et constitue l'armature de la cage radiale 6. Un deuxième châssis auxiliaire 48 est monté sur le châssis principal 4 en étant mobile le long de l'axe X2 par rapport à ce châssis principal. Le châssis auxiliaire 48 constitue l'armature de la cage axiale 8. The rolling mill 2 shown in Figures 1 to 10 comprises a fixed main frame 4 which defines a longitudinal axis X2 of the rolling mill 2. The frame 2 supports a radial cage 6 which is fixedly mounted on the frame, and an axial cage 8 mobile relative to the chassis 4, along the axis X2. A first auxiliary frame 46 is fixedly mounted on the main frame 4 and constitutes the frame of the radial cage 6. A second auxiliary frame 48 is mounted on the main frame 4 while being movable along the axis X2 relative to to this main frame. The auxiliary frame 48 constitutes the frame of the axial cage 8.
On note P une pièce en cours de conformation dans le laminoir 2. Cette pièce est centrée sur un axe XP vertical et perpendiculaire à l'axe X2. On note respectivement P2 et P4 des surfaces radiales interne et externe de la pièce P. De la même façon, on note P6 et P8 des surfaces frontales supérieure et inférieure de cette pièce P, lorsqu'elle est en place dans le laminoir 2.  We note P a part being shaped in the rolling mill 2. This part is centered on a vertical axis XP and perpendicular to the axis X2. P2 and P4 are respectively denoted by the inner and outer radial surfaces of the piece P. Similarly, P6 and P8 are noted on the upper and lower end surfaces of this piece P, when it is in place in the rolling mill 2.
Le châssis 46 de la cage radiale 6 supporte un rouleau principal cylindrique 62 monté rotatif autour d'un axe vertical Z62 et entraîné en rotation par un moteur électrique principal 64. Le rouleau principal 62 est monté dans la cage radiale 6 pour venir en appui contre la surface radiale externe P4 de la pièce P.  The frame 46 of the radial cage 6 supports a cylindrical main roller 62 rotatably mounted about a vertical axis Z62 and driven in rotation by a main electric motor 64. The main roller 62 is mounted in the radial cage 6 to bear against the external radial surface P4 of the piece P.
Le châssis 46 de la cage radiale 6 supporte également un rouleau secondaire cylindrique ou mandrin 66 monté rotatif autour d'un axe vertical Z66 parallèle à l'axe Z62. Le rouleau secondaire 66 est supporté par une traverse 68 qui est mobile, parallèlement à l'axe X2, par rapport au châssis secondaire 46 de la cage radiale 6. Pour ce faire, la traverse 68 est solidaire de deux barres 72 et 74 qui s'étendent chacune selon une direction parallèle à l'axe X2.  The frame 46 of the radial cage 6 also supports a cylindrical secondary roller or mandrel 66 rotatably mounted about a vertical axis Z66 parallel to the axis Z62. The secondary roller 66 is supported by a cross member 68 which is movable, parallel to the axis X2, relative to the secondary frame 46 of the radial cage 6. To do this, the cross member 68 is integral with two bars 72 and 74 which are 'each extend in a direction parallel to the axis X2.
Les rouleaux 62 et 66 sont pleins et à section circulaire.  The rollers 62 and 66 are solid and circular in section.
Par ailleurs, un plateau 70 est monté en-dessous de la traverse 68 et pourvu d'un logement 70A de réception de la partie inférieure du rouleau secondaire 66. Ce plateau 70 est également mobile par rapport au châssis auxiliaire 46 en étant supporté par deux barres 76 et 78.  Furthermore, a plate 70 is mounted below the cross member 68 and provided with a housing 70A for receiving the lower part of the secondary roller 66. This plate 70 is also movable relative to the auxiliary frame 46 being supported by two bars 76 and 78.
On note respectivement X78, X74, X76 et X78 les axes longitudinaux des barres X78, X74, X76 and X78 are respectively denoted by the longitudinal axes of the bars
74 à 78 qui sont parallèles à l'axe X2. 74 to 78 which are parallel to the axis X2.
La cage radiale 6 comprend également deux bras de centrage de la pièce P, un seul de ces bras de centrage étant visible à la figure 1 avec la référence 65.  The radial cage 6 also comprises two centering arms of the part P, only one of these centering arms being visible in FIG. 1 with the reference 65.
Un système de levage à crémaillères 77 et 79 permet de soulever la traverse 68 lors de la mise en place de la pièce P dans le laminoir 2, puis de l'abaisser pour introduire la partie inférieure du rouleau secondaire 66 dans le logement 70A du plateau 70.  A lifting system with racks 77 and 79 makes it possible to lift the cross-member 68 during the positioning of the piece P in the rolling mill 2, and then to lower it to introduce the lower part of the secondary roller 66 into the housing 70A of the tray 70.
Plusieurs moto-réducteurs électriques sont prévus dans la cage radiale 6, à savoir :  Several electric geared motors are provided in the radial cage 6, namely:
- deux moto-réducteurs électriques 172 et 174 d'entraînement des barres 72 et 74, selon leurs axes longitudinaux respectifs X72 et X74, - deux moto-réducteurs électriques 176 et 178 d'entraînement des barres 76 et 78, selon leurs axes longitudinaux respectifs X76 et X78, two electric gear motors 172 and 174 driving the bars 72 and 74, along their respective longitudinal axes X72 and X74, two electric gear motors 176 and 178 for driving bars 76 and 78, along their respective longitudinal axes X 76 and X 78,
- deux moto-réducteurs électriques 163 et 165 d'entraînement en rotation des bras de centrage 65 et équivalent, autour d'axes verticaux Z63 et Z65.  two electric gear motors 163 and 165 for rotating the centering arms 65 and the like around vertical axes Z63 and Z65.
Le moto-réducteur 172 comprend un moteur électrique 172A et un réducteur The geared motor 172 includes an electric motor 172A and a reducer
172B. Les autres moto-réducteurs ont la même structure, avec chacun un moteur électrique associé à un réducteur. 172B. The other geared motors have the same structure, each with an electric motor associated with a reducer.
A la figure 3, le moto-réducteur 174 est omis, pour permettre la visualisation de la barre 74 et du pignon 273 associé.  In Figure 3, the geared motor 174 is omitted, to allow viewing of the bar 74 and the pinion 273 associated.
Les barres 72 à 78 permettent de transmettre au rouleau 66 un mouvement de déplacement, parallèle à l'axe X2 et à chacun des axes X72 à X78, généré par les moto- réducteurs 172 à 178.  The bars 72 to 78 make it possible to transmit to the roller 66 a movement movement, parallel to the axis X2 and to each of the axes X72 to X78, generated by the geared motors 172 to 178.
Chacun des moto-réducteurs 172 à 178 est monté de façon fixe par rapport au châssis auxiliaire 46 de la cage radiale 6. Par exemple, le moto-réducteur 172 est supporté rigidement par une plaque 46A appartenant au châssis auxiliaire 46. De même, le moto-réducteur 174 est supporté rigidement par une plaque 46B appartenant au châssis auxiliaire 46. Les moto-réducteurs 176 et 178 sont supportés par des plaques 46C et 46D du châssis auxiliaire 46. Pour la clarté du dessin, les plaques 46A et 46B sont omises aux figures 3 à 7. On remarque à la figure 1 qu'elles supportent également les moto-réducteurs 163 et 165. Ceci n'est toutefois pas obligatoire.  Each geared motor 172 to 178 is fixedly mounted relative to the auxiliary frame 46 of the radial cage 6. For example, the geared motor 172 is rigidly supported by a plate 46A belonging to the auxiliary frame 46. Similarly, geared motor 174 is rigidly supported by a plate 46B belonging to the auxiliary frame 46. The geared motors 176 and 178 are supported by plates 46C and 46D of the auxiliary frame 46. For the sake of clarity, the plates 46A and 46B are omitted. Figures 3 to 7. Note in Figure 1 that they also support the geared motors 163 and 165. However, this is not mandatory.
En fonctionnement normal du laminoir 2, la pièce P est comprimée radialement entre les rouleaux 62 et 66 qui sont entraînés en rotation, autour des axes Z62 et Z66, de façon directe par le moteur 64, pour le rouleau 62, et indirecte à travers la pièce P, pour le rouleau 66.  In normal operation of the rolling mill 2, the part P is compressed radially between the rollers 62 and 66 which are rotated around the axes Z62 and Z66, directly by the motor 64, for the roller 62, and indirectly through the piece P, for the roll 66.
Un ensemble pignon-crémaillère est utilisé pour transmettre un mouvement de chaque moto-réducteur 172 à 178 vers le rouleau secondaire ou mandrin 66, afin de contrôler la position de ce rouleau en translation selon l'axe X2.  A rack and pinion assembly is used to transmit a movement of each geared motor 172 to 178 to the secondary roller or mandrel 66 to control the position of the roller in translation along the axis X2.
Ainsi, un pignon 273 est monté sur l'arbre de sortie du réducteur 172B. Ce pignon 273 coopère avec une crémaillère 272 montée sur la barre 72.  Thus, a pinion 273 is mounted on the output shaft of the reducer 172B. This pinion 273 cooperates with a rack 272 mounted on the bar 72.
Le montage de la crémaillère 272 sur la barre 72 est rigide en configuration normale d'utilisation du laminoir 2. Ce montage comprend toutefois un degré de liberté, qui peut être mis en œuvre en cas d'irrégularité sur la surface P2 de la pièce P, dans un sens où un relief en saillie présent sur cette surface P2 tend à déplacer le rouleau secondaire ou mandrin 66 en direction de l'axe XP. De même, un degré de liberté est mis en œuvre dans le montage de la crémaillère 272 sur la barre 72 lorsqu'une irrégularité résulte d'un relief en saillie sur la surface P4 qui tend à repousser la pièce P et le rouleau secondaire 66 en direction de l'axe XP, par réaction contre le rouleau principal 62 dont l'axe Z62 est fixe par rapport au châssis auxiliaire 46. The mounting of the rack 272 on the bar 72 is rigid in the normal configuration of use of the rolling mill 2. This assembly however comprises a degree of freedom, which can be implemented in case of irregularity on the surface P2 of the piece P in a sense that a protruding relief present on this surface P2 tends to move the secondary roller or mandrel 66 towards the axis XP. Similarly, a degree of freedom is implemented in the assembly of the rack 272 on the bar 72 when an irregularity results from a protruding projection on the surface P4 which tends to push the piece P and the secondary roller 66 in the direction of the axis XP, by reaction against the main roller 62 whose axis Z62 is fixed relative to the auxiliary frame 46.
Pour ce faire, et comme visible aux figures 3 à 7, un mécanisme à décharge fluidique M72 est intégré dans la barre 72 et permet d'autoriser un déplacement relatif, selon l'axe X72, entre le rouleau 62 et la crémaillère 272, plus précisément entre la crémaillère 272 et la barre 72 qui est rigidement fixée au rouleau 66, le long de l'axe X2, par l'intermédiaire de la traverse 68.  For this purpose, and as visible in FIGS. 3 to 7, a fluidic discharge mechanism M72 is integrated in the bar 72 and makes it possible to allow a relative displacement, along the axis X72, between the roller 62 and the rack 272, plus precisely between the rack 272 and the bar 72 which is rigidly fixed to the roll 66, along the axis X2, through the cross member 68.
A la figure 3, les capots 46A et 46B sont omis et les barres 72 et 74 sont représentées à moitié arrachées selon un plan horizontal. Ceci permet de visualiser le mécanisme M72 et le mécanisme équivalent M74 associé à la barre 74.  In Figure 3, the covers 46A and 46B are omitted and the bars 72 and 74 are shown half torn in a horizontal plane. This makes it possible to visualize the mechanism M72 and the equivalent mechanism M74 associated with the bar 74.
Le mécanisme M72 comprend un support 720 rigidement lié à la crémaillère 272, par exemple par des vis non représentées. Ce support 720 est reçu dans un logement 722 ménagé à l'intérieur de la barre 72, avec une longueur axiale L722, mesurée parallèlement à l'axe X72, qui est supérieure à la longueur axiale L720 du support 720, également mesurée parallèlement à cet axe. Ainsi, le support 720 peut coulisser à l'intérieur du logement 722, parallèlement à l'axe X72. Le mécanisme M72 comprend également un piston 724 qui est disposé dans un logement terminal 726 ménagé au niveau de l'extrémité 72A de la barre 72 qui est opposée à la traverse 68, donc au rouleau secondaire 66. Le logement terminal 726 est obturé par un couvercle 728 rigidement fixé à la barre 72.  The mechanism M72 comprises a support 720 rigidly connected to the rack 272, for example by screws not shown. This support 720 is received in a housing 722 formed inside the bar 72, with an axial length L722, measured parallel to the axis X72, which is greater than the axial length L720 of the support 720, also measured parallel to this axis. axis. Thus, the support 720 can slide inside the housing 722, parallel to the axis X72. The mechanism M72 also comprises a piston 724 which is arranged in a terminal housing 726 formed at the end 72A of the bar 72 which is opposite to the cross member 68, therefore to the secondary roller 66. The terminal housing 726 is closed by a cover 728 rigidly fixed to the bar 72.
Le mécanisme M72 comprend également une tige 723 de liaison entre le support 720 et le piston 724. La tige 723, qui est par exemple en appui simple contre le support 720 et le piston 724, est disposée dans un canal central et longitudinal 725 de la tige 72 qui relie entre eux les logements 722 et 726. La compression de la tige 723 entre le support 720 et le piston 724 permet de créer entre les pièces 720, 723 et 724 une liaison rigide en translation parallèle à l'axe X72 lorsque le support déplace le piston vers la droite à la figure 5 ou lorsque le piston déplace le support vers la gauche sur cette figure.  The mechanism M72 also comprises a rod 723 connecting the support 720 and the piston 724. The rod 723, which is for example in simple support against the support 720 and the piston 724, is disposed in a central and longitudinal channel 725 of the rod 72 which interconnects the housing 722 and 726. The compression of the rod 723 between the support 720 and the piston 724 creates between the parts 720, 723 and 724 a rigid connection in translation parallel to the axis X72 when the support moves the piston to the right in Figure 5 or when the piston moves the support to the left in this figure.
Les pièces 72, 272, 720, 723 et 724 sont réalisées en métal, par exemple en acier. Des patins de guidage 727, par exemple en bronze, sont prévus sur le support 720 pour le guider à l'intérieur du logement 722 et faciliter son coulissement. De la même façon, des bagues de guidage 729, par exemple en cuivre, sont prévues autour de la tige 723, à l'intérieur du canal 725. En variante, seuls les patins 727 ou les patins 729 sont prévus.  The parts 72, 272, 720, 723 and 724 are made of metal, for example steel. Guiding shoes 727, for example bronze, are provided on the support 720 to guide it inside the housing 722 and facilitate its sliding. Similarly, guide rings 729, for example copper, are provided around the rod 723, inside the channel 725. Alternatively, only the pads 727 or pads 729 are provided.
Le piston 724 est équipé de joints d'étanchéité 724A qui lui permettent d'isoler une partie du logement terminale 726, située entre sa face 724B tournée vers le couvercle 728 et ce couvercle, du canal 725. Ainsi, une chambre C72 de volume variable est définie dans le logement terminal 726, entre la face 724B du piston 724 et le couvercle 728. The piston 724 is equipped with seals 724A which allow it to isolate a portion of the terminal housing 726, located between its face 724B turned towards the cover 728 and this cover, channel 725. Thus, a variable volume chamber C72 is defined in the terminal housing 726, between the face 724B of the piston 724 and the cover 728.
Cette chambre de volume variable C72 est alimentée en huile sous pression à travers un orifice 728A du couvercle 728 et un conduit 732 qui appartient à un système 73 d'alimentation de la chambre C72 en huile sous pression, avec une pression supérieure à 100 bars. En pratique, la pression délivrée par le système 73 est choisie supérieure à 200 bars, de préférence de l'ordre de 250 bars. Le système 73 peut comprendre, comme cela est représenté schématiquement aux figures 3, 5 et 7, une pompe 734 qui délivre l'huile à la pression de consigne, en la puisant dans un bac 736, alors qu'un clapet anti-retour taré 738 relie le conduit 732 au bac 736. Un autre clapet anti-retour 739, monté en sens inverse du clapet anti-retour 738, à la sortie de la pompe 732, évite que de l'huile circule à travers la pompe, en sens inverse, c'est-à-dire de sa sortie vers son entrée.  This variable volume chamber C72 is supplied with pressurized oil through a port 728A of the cover 728 and a conduit 732 which belongs to a system 73 for supplying the chamber C72 with oil under pressure, with a pressure greater than 100 bar. In practice, the pressure delivered by the system 73 is chosen to be greater than 200 bar, preferably of the order of 250 bar. The system 73 may comprise, as shown diagrammatically in FIGS. 3, 5 and 7, a pump 734 which delivers the oil to the set pressure, by drawing it from a tank 736, while a calibrated check valve 738 connects the conduit 732 to the tray 736. Another non-return valve 739, mounted in the opposite direction of the non-return valve 738, at the outlet of the pump 732, prevents oil from circulating through the pump, in the direction inverse, that is, from its output to its input.
Ainsi, le système 73 permet de délivrer à l'intérieur de la chambre C72 de l'huile à une pression égale à la pression de sortie de la pompe 734. Le clapet 738 est, de préférence, taré de telle sorte que, si la pression dans la chambre C72 et dans le conduit 732 dépasse la pression de sortie de la pompe 734, l'huile présente dans le conduit 732 est renvoyée vers le bac 736, à travers ce clapet.  Thus, the system 73 makes it possible to deliver oil inside the chamber C72 at a pressure equal to the outlet pressure of the pump 734. The valve 738 is preferably calibrated in such a way that, if the pressure in the chamber C72 and in the conduit 732 exceeds the outlet pressure of the pump 734, the oil in the conduit 732 is returned to the tray 736, through this valve.
Le système 73 est un système connu dans le domaine hydraulique. Compte tenu du volume d'huile qu'il contient, de l'ordre d'un ou deux litres, il est beaucoup plus facile à mettre en œuvre et beaucoup moins onéreux que les centrales utilisées classiquement dans les laminoirs pour alimenter des vérins prévus pour déplacer les rouleaux de conformation.  The system 73 is a system known in the hydraulic field. Given the volume of oil it contains, of the order of one or two liters, it is much easier to implement and much less expensive than the plants conventionally used in rolling mills to feed jacks intended for move the conformation rollers.
Le mécanisme à décharge M72 comprend la barre 72 ainsi que les pièces et volumes 720 à 729.  The discharge mechanism M72 comprises the bar 72 as well as the parts and volumes 720 to 729.
Par défaut, la pression de l'huile présente dans la chambre C72, de l'ordre de 250 bars, est suffisante pour rigidifier la liaison cinématique entre la crémaillère 272 et la barre 72, donc entre la crémaillère 272 et le rouleau secondaire 66, en fonctionnement normal du laminoir 2.  By default, the pressure of the oil present in the chamber C72, of the order of 250 bar, is sufficient to stiffen the kinematic connection between the rack 272 and the bar 72, therefore between the rack 272 and the secondary roller 66, in normal operation of the rolling mill 2.
Les barres 74, 76 et 78 sont également reliées aux moteurs 174, 176 et 178 par des chaînes cinématiques qui incluent chacune un mécanisme à décharge fluidique du type du mécanisme M72, le mécanisme M74 utilisé pour la barre 74 étant visible à la figure 3, alors que les mécanismes correspondants M76 et M78 utilisés pour les barres 76 et 78 sont masqués par les plaques 46C et 46D. Le mécanisme à décharge M74 est inséré entre, d'une part, un ensemble comprenant un pignon 275 et une crémaillère 274 et, d'autre part, la traverse 68, par l'intermédiaire de la barre 74. Les mécanismes M76 et M78 sont insérés entre, d'une part, les ensembles pignons-crémaillères montés en pied des moto-réducteurs 176 et 178 et, d'autre part, le plateau 70. The bars 74, 76 and 78 are also connected to the motors 174, 176 and 178 by kinematic chains which each include a fluidic discharge mechanism of the M72 mechanism type, the mechanism M74 used for the bar 74 being visible in FIG. 3, while the corresponding mechanisms M76 and M78 used for the bars 76 and 78 are masked by the plates 46C and 46D. The discharge mechanism M74 is inserted between, on the one hand, an assembly comprising a pinion 275 and a rack 274 and, on the other hand, the cross-member 68, via the bar 74. The mechanisms M76 and M78 are inserted between, on the one hand, the rack-and-rack assemblies mounted on the bottom of the geared motors 176 and 178 and, on the other hand, the plate 70.
Par défaut, le laminoir est dans la configuration des figures 3 à 5.  By default, the rolling mill is in the configuration of Figures 3 to 5.
A la figure 3, un seul système d'alimentation 73 est représenté. En pratique, on peut prévoir un tel système pour alimenter le mécanisme à décharge M72, M74 ou équivalent associé à chaque barre 74 à 78, ou un système commun à certains ou à tous ces mécanismes.  In Figure 3, only one power system 73 is shown. In practice, such a system can be provided to feed the discharge mechanism M72, M74 or equivalent associated with each bar 74 to 78, or a system common to some or all of these mechanisms.
En cas de relief en saillie sur l'une des surfaces radiales P2 ou P4 de la pièce P, le rouleau secondaire 66 est déplacé temporairement vers l'axe XP, ce qui entraîne le déplacement de la traverse 68 et du plateau 70 dans le même sens, vers la gauche à la figure 2.  In the case of projecting relief on one of the radial surfaces P2 or P4 of the part P, the secondary roller 66 is temporarily displaced towards the axis XP, which causes the displacement of the cross member 68 and the plate 70 in the same direction. direction, to the left in Figure 2.
Ce déplacement est transmis aux barres 72 à 78 qui sont rigidement liées aux pièces 68 et 70.  This displacement is transmitted to the bars 72 to 78 which are rigidly connected to the parts 68 and 70.
Dans ce qui suit, on considère ce qui se passe au niveau de la barre 72, étant entendu que le fonctionnement est le même au niveau des barres 74 à 78.  In what follows, we consider what happens at the bar 72, it being understood that the operation is the same at the bars 74 to 78.
Sous l'effet du déplacement temporaire de la traverse 68, la barre 72 est déplacée brutalement en direction de la cage axiale 8, dans le sens de la flèche F1 à la figure 7. Il convient d'éviter que ce mouvement ne soit transmis au moto-réducteur 172, pour limiter les risques de casse et l'usure prématurée de ce matériel. Ce déplacement de la barre 72 est transmis au couvercle 728, ce qui a pour effet d'augmenter la pression d'huile à l'intérieur de la chambre de volume variable C72. Cette augmentation de pression se traduit par l'éjection de l'huile de la chambre C72 vers le système d'alimentation 73, à travers l'orifice 728A. Dans ce cas, la pression de l'huile sortant de la chambre C72 est supérieure à la pression de sortie de la pompe 734 et l'huile, bloquée par le clapet anti- retour 739, s'écoule en retour vers le bac 736, à travers le clapet 738, comme représenté par la flèche F2 à la figure 7.  Under the effect of the temporary displacement of the crosspiece 68, the bar 72 is moved roughly towards the axial cage 8, in the direction of the arrow F1 in FIG. 7. It is necessary to prevent this movement from being transmitted to the geared motor 172, to limit the risk of breakage and premature wear of this material. This movement of the bar 72 is transmitted to the cover 728, which has the effect of increasing the oil pressure within the variable volume chamber C72. This increase in pressure results in the ejection of the oil from the chamber C72 to the supply system 73, through the orifice 728A. In this case, the pressure of the oil exiting the chamber C72 is greater than the outlet pressure of the pump 734 and the oil, blocked by the non-return valve 739, flows back to the tank 736, through the valve 738, as represented by the arrow F2 in FIG. 7.
En d'autres termes, du fait du mouvement de la barre 72 dans le sens de la flèche F1 , le piston 724 qui est rigidement fixé à la crémaillère 272 à travers la tige 723 et le support 720, se déplace à l'intérieur du logement 726 dans un sens de réduction du volume de la chambre C72. Ceci permet que, dans le référentiel du châssis secondaire 46, le piston 724, la tige 723, le support 720 et la crémaillère 272 demeurent fixes, alors que la barre 72 se déplace dans le sens de la flèche F1 . En d'autres termes, le mécanisme de décharge M72 permet un déplacement relatif de la crémaillère 272 et de la barre 72, ce qui évite de transmettre au pignon 273 et, à travers lui, au moto-réducteur 172 une accélération violente susceptible d'endommager le moteur 172A et/ou le réducteur 172B. Le mécanisme de décharge M72 constitue donc un mécanisme de protection du moteur électrique 172A, du réducteur 172B et de l'ensemble pignon- crémaillère 272-273 à rencontre d'accélérations violentes pouvant résulter d'irrégularités de surface de la pièce P en cours de conformation dans le laminoir 2. In other words, because of the movement of the bar 72 in the direction of the arrow F1, the piston 724 which is rigidly fixed to the rack 272 through the rod 723 and the support 720, moves within the housing 726 in a direction of reducing the volume of the chamber C72. This allows that, in the frame of the secondary frame 46, the piston 724, the rod 723, the support 720 and the rack 272 remain fixed, while the bar 72 moves in the direction of the arrow F1. In other words, the discharge mechanism M72 allows a relative movement of the rack 272 and the bar 72, which avoids transmitting to the pinion 273 and, through it, to the geared motor 172 a violent acceleration likely to damage the 172A motor and / or the reducer 172B. The discharge mechanism M72 thus constitutes a mechanism for protecting the electric motor 172A, the gearbox 172B and the rack and pinion assembly 272-273 against violent accelerations that may result from surface irregularities of the piece P during operation. conformation in the mill 2.
La comparaison des figures 5 et 7 permet de remarquer que, même si la barre 71 s'est déplacée vers la gauche, dans le sens de la flèche F1 , la crémaillère 272 et le pignon 273 ont conservé leurs positions, du fait de la réduction du volume de la chambre C72.  The comparison of FIGS. 5 and 7 makes it possible to observe that, even if the bar 71 has moved to the left, in the direction of the arrow F1, the rack 272 and the pinion 273 have retained their positions, because of the reduction. the volume of room C72.
La cage axiale 8 comprend deux rouleaux coniques 82 et 84 destinés à agir respectivement sur la surface frontale supérieure P6 et sur la surface frontale inférieure P8 de la pièce P.  The axial cage 8 comprises two conical rollers 82 and 84 intended to act respectively on the upper front surface P6 and on the lower front surface P8 of the part P.
Les rouleaux coniques 82 et 84 sont chacun entraînés en rotation par un moteur électrique 86 ou 88 et supportés par le châssis auxiliaire 48.  The tapered rollers 82 and 84 are each rotated by an electric motor 86 or 88 and supported by the auxiliary frame 48.
Le rouleau 82 est supporté par une platine 90 qui est mobile verticalement, le long d'un axe Z90 parallèle aux axes Z62 et Z66, par rapport au châssis secondaire 48.  The roller 82 is supported by a plate 90 which is vertically movable, along an axis Z90 parallel to the axes Z62 and Z66, with respect to the secondary frame 48.
Pour ce faire, la platine 90 est rigidement fixée à un sabot 91 , lui-même attelé à l'extrémité inférieure 92A d'une barre ou colonne 92. Comme les barres 72 à 78, la barre 92 permet de transmettre au rouleau 82 un mouvement de déplacement en translation selon son axe longitudinal X92 confondu avec l'axe Z90.  To do this, the plate 90 is rigidly fixed to a shoe 91, which itself is coupled to the lower end 92A of a bar or column 92. Like the bars 72 to 78, the bar 92 makes it possible to transmit to the roller 82 a displacement movement in translation along its longitudinal axis X92 coincides with the axis Z90.
Le déplacement de la barre 92 selon l'axe Z90 est contrôlé par une crémaillère à double denture 292, elle-même pilotée par deux moto -réducteurs 192 et 194 montés fixes sur le châssis 48. Des pignons 293 et 295 sont respectivement montés sur les arbres de sortie des moto-réducteurs 192 et 194 et engrènent simultanément avec les deux dentures prévues, de part et d'autre de l'axe Z90, sur la crémaillère 292.  The displacement of the bar 92 along the axis Z90 is controlled by a rack with double toothing 292, itself controlled by two geared motors 192 and 194 fixedly mounted on the frame 48. Sprockets 293 and 295 are respectively mounted on the Output shafts of the geared motors 192 and 194 and mesh simultaneously with the two teeth provided, on either side of the axis Z90, on the rack 292.
La crémaillère est guidée en translation selon l'axe Z90 par des rails formés dans des plaques de guidage 197 et 199, la plaque 199 étant partiellement arrachée à la figure 8 et complètement retirée aux figures 9 et 10, pour la clarté des dessins. Les plaques 197 et 199 font partie du châssis auxiliaire 48. Les moto-réducteurs 192 et 194 sont rapportés sur le châssis 48 à travers la plaque 197.  The rack is guided in translation along the axis Z90 by rails formed in guide plates 197 and 199, the plate 199 being partially cut away from FIG. 8 and completely withdrawn in FIGS. 9 and 10, for the sake of clarity of the drawings. The plates 197 and 199 are part of the auxiliary frame 48. The geared motors 192 and 194 are attached to the frame 48 through the plate 197.
L'extrémité supérieure de la barre 92 forme un piston 924 qui est engagé, de façon étanche grâce à un joint 924A, dans un logement creux 926 ménagé en partie basse de la crémaillère 292, au centre de celle-ci. Ceci constitue une chambre C92 de volume variable définie entre la surface supérieure 924B du piston 924 et le fond 926B du logement 926. Un conduit 291 traverse la crémaillère 292 sur toute sa hauteur, à partir du logement 926, ce qui permet de relier la chambre C92 à un système 93 d'alimentation de cette chambre en huile sous pression. Le système 93 comprend un conduit 932, une pompe 934, un bac de récupération 936, un clapet anti-retour taré 938 et un clapet antiretour 739. The upper end of the bar 92 forms a piston 924 which is sealingly engaged by a seal 924A, in a hollow housing 926 formed in the lower part of the rack 292, in the center thereof. This constitutes a chamber C92 of variable volume defined between the upper surface 924B of the piston 924 and the bottom 926B of the housing 926. A conduit 291 passes through the rack 292 over its entire height, from the housing 926, which allows to connect the chamber C92 to a 93 power supply system this chamber in oil under pressure. The system 93 comprises a conduit 932, a pump 934, a recovery tank 936, a calibrated check valve 938 and a check valve 739.
En pratique, le système d'alimentation 93 peut être identique ou non au système d'alimentation 73. Ces systèmes peuvent être confondus.  In practice, the power supply system 93 may or may not be identical to the power supply system 73. These systems may be confused.
En fonctionnement normal du laminoir 2 représenté aux figures 8 et 9, la pression dans la chambre C92 est suffisante pour que la liaison cinématique entre la crémaillère 292 et le rouleau conique supérieur 82 soient rigide, ce qui permet de piloter de façon précise la hauteur de ce rouleau.  In normal operation of the rolling mill 2 shown in FIGS. 8 and 9, the pressure in the chamber C92 is sufficient for the kinematic connection between the rack 292 and the upper conical roller 82 to be rigid, which makes it possible to precisely control the height of the this roll.
En cas d'irrégularité en saillie sur la surface frontale supérieure P6 ou sur la surface frontale inférieure, le rouleau 82 est déplacé vers le haut, dans le sens de la flèche F3 à la figure 10, ce qui se traduit par une translation verticale vers le haut de la platine 90, du sabot 91 et de la barre 92. Ceci a pour effet de chasser l'huile présente dans la chambre C92 vers le système 93, donc vers le bac 936 à travers le clapet 938, comme expliqué ci-dessus au sujet de la barre 72 et du système d'alimentation 73, ce que représente la flèche F4.  In the event of a protruding irregularity on the upper front surface P6 or on the lower front surface, the roller 82 is moved upwards in the direction of the arrow F3 in FIG. 10, which results in a vertical translation towards the top of the plate 90, the shoe 91 and the bar 92. This has the effect of driving the oil present in the chamber C92 to the system 93, so to the tray 936 through the valve 938, as explained above. above about the bar 72 and the feed system 73, which represents the arrow F4.
Le fonctionnement est ici comparable à celui mentionné précédemment au sujet du mécanisme à décharge M72. Il est donc formé dans la cage axiale 8 un mécanisme à décharge M92 qui permet de piloter précisément la hauteur du rouleau conique 82 par rapport au châssis auxiliaire 48, en fonctionnement normal du laminoir 2 et d'accommoder une éventuelle irrégularité de surface sur l'une des surfaces frontales P6 ou P8, sans risquer d'endommager les moto-réducteurs 192 et 194, alors que ceux-ci sont montés de façon rigide par rapport au châssis secondaire 48.  The operation here is comparable to that mentioned above concerning the M72 discharge mechanism. It is thus formed in the axial cage 8 a discharge mechanism M92 which allows to precisely control the height of the conical roller 82 relative to the auxiliary frame 48, in normal operation of the mill 2 and accommodate any surface irregularity on the one of the front surfaces P6 or P8, without risk of damaging the geared motors 192 and 194, while these are mounted rigidly relative to the secondary frame 48.
En variante, les systèmes 73 et 93 peuvent être remplacés par d'autres systèmes d'alimentation des chambres de volume variable C72, C74, C92, ... en huile sous pression à une pression donnée. On peut notamment utiliser un réservoir accumulateur chargé en huile à la pression souhaitée et associé à une soupape de décharge tarée, ou une chambre de gavage. Dans le cas d'une chambre de gavage, la tige 273 est rigidement liée au support 720 et au piston 724, ce qui permet d'aspirer de l'huile dans la chambre de gavage, à la façon d'une seringue, avant de mettre la chambre de volume variable C72 ou équivalente sous une pression de l'ordre de 250 bars en repoussant le piston 724, après avoir coupé la communication entre cette chambre et la chambre de gavage. . Dans l'exemple décrit ci-dessus, l'invention est mise en œuvre pour contrôler le déplacement, en translation vis-à-vis des châssis 46 et 48, des rouleaux 66 et 82. En variante, elle peut être utilisée pour un seul de ces rouleaux. As a variant, the systems 73 and 93 can be replaced by other systems for feeding the chambers of variable volume C72, C74, C92, etc. to oil under pressure at a given pressure. In particular, it is possible to use an accumulator tank loaded with oil at the desired pressure and associated with a calibrated discharge valve, or a booster chamber. In the case of a feeding chamber, the rod 273 is rigidly connected to the support 720 and the piston 724, which makes it possible to draw oil into the feeding chamber, like a syringe, before put the variable volume chamber C72 or equivalent under a pressure of the order of 250 bar by pushing the piston 724, after cutting the communication between this chamber and the booster chamber. . In the example described above, the invention is implemented to control the displacement, in translation vis-à-vis the frames 46 and 48, of the rollers 66 and 82. Alternatively, it can be used for a single of these rollers.
Selon une variante non représentée de l'invention, les barres 72 et 74, d'une part, et les barres 76 et 78, d'autre part, peuvent être reliées entre elles par des traverses arrière disposées à l'opposé de la traverse 68 et du plateau 70. Dans ce cas, un ensemble pignon-crémaillère entraîné par un ou plusieurs moto-réducteurs peut être prévu pour contrôler le déplacement de chaque traverse arrière selon l'axe X2. La structure de l'ensemble pignon-crémaillère montée sur le châssis auxiliaire 46 peut être inspirée de celle représentée aux figures pour la cage axiale 8, avec un équivalent de la barre 92 qui est disposé horizontalement et qui attaque chaque traverse arrière, dans un sens d'écartement par rapport à l'axe Z62 du rouleau principal 62.  According to a not shown variant of the invention, the bars 72 and 74, on the one hand, and the bars 76 and 78, on the other hand, can be interconnected by rear crosspieces arranged opposite the crossbar. 68 and the plate 70. In this case, a rack and pinion assembly driven by one or more geared motors can be provided to control the movement of each rear cross member along the axis X2. The structure of the rack and pinion assembly mounted on the auxiliary frame 46 can be inspired from that shown in the figures for the axial cage 8, with an equivalent of the bar 92 which is arranged horizontally and which attacks each rear cross member in one direction. spacing relative to the axis Z62 of the main roller 62.
Selon une autre variante, un seul ensemble pignon-crémaillère est utilisé pour déplacer les deux traverses arrière et, à travers elles, les quatre colonnes. Selon encore une autre variante, une unique traverse relie les quatre barres 72 à 78.  According to another variant, a single rack and pinion assembly is used to move the two rear cross members and, through them, the four columns. According to yet another variant, a single crossbar connects the four bars 72 to 78.
Le nombre de barres de traction utilisées pour contrôler la translation du rouleau 66 le long de l'axe X2 peut être différent de quatre.  The number of drawbars used to control the translation of the roll 66 along the axis X2 may be different from four.
Le mode de réalisation et les variantes envisagées ci-dessus peuvent être combinés pour générer de nouveaux modes de réalisation de l'invention.  The embodiment and alternatives contemplated above may be combined to generate new embodiments of the invention.

Claims

REVENDICATIONS
1 . - Laminoir (2) circulaire comprenant 1. - Circular rolling mill (2) comprising
- un châssis principal fixe (4) ;  - a fixed main frame (4);
- une paire de rouleaux cylindriques (62, 66), respectivement interne et externe, destinés à façonner des faces radiales (P2, P4) interne et externe d'une pièce annulaire (P) et supportés par un premier châssis auxiliaire (46) monté sur le châssis principal ;  a pair of cylindrical rollers (62, 66), respectively internal and external, for shaping internal and external radial faces (P2, P4) of an annular piece (P) and supported by a first auxiliary frame (46) mounted on the main chassis;
- une paire de rouleaux coniques (82, 84), respectivement supérieur et inférieur, destinés à façonner des faces frontales opposées (P6, P8) de la pièce et supportés par un deuxième châssis auxiliaire (48) monté sur le châssis principal ;  a pair of upper and lower conical rollers (82, 84) for shaping opposite end faces (P6, P8) of the workpiece and supported by a second auxiliary frame (48) mounted on the main frame;
- au moins un ensemble pignon-crémaillère (272-273, 274-275, 292-293- 295) de déplacement en translation d'un rouleau (68, 82) par rapport au châssis auxiliaire qui le supporte ; et  - At least one rack and pinion assembly (272-273, 274-275, 292-293-295) translational movement of a roller (68, 82) relative to the auxiliary frame which supports it; and
- au moins un moto-réducteur électrique (172-178, 192, 194) d'entraînement du pignon (273, 275, 293, 295) de l'ensemble pignon- crémaillère  at least one electric gear motor (172-178, 192, 194) driving the pinion (273, 275, 293, 295) of the rack and pinion assembly
caractérisé en ce que : characterized in that
- le moto-réducteur électrique (172-178, 192, 194) est monté de façon fixe par rapport à l'un des châssis auxiliaires (46, 48) ;  the electric gear motor (172-178, 192, 194) is fixedly mounted with respect to one of the auxiliary frames (46, 48);
- un mécanisme à décharge fluidique (M72, M74, M76, M78, M92) est intercalé dans une chaîne cinématique de transmission d'effort entre la crémaillère (272, 274, 292) et le rouleau (66, 82) déplacé par cette crémaillère ;  - A fluidic discharge mechanism (M72, M74, M76, M78, M92) is interposed in a kinematic transmission of effort between the rack (272, 274, 292) and the roller (66, 82) moved by this rack ;
- le mécanisme à décharge fluidique comprend au moins une chambre de volume variable (C72, C74, C92) alimentée en fluide sous pression et dont le volume varie en fonction de la position relative du rouleau (66, 82) et de la crémaillère (272, 274, 292).  the fluidic discharge mechanism comprises at least one chamber of variable volume (C72, C74, C92) fed with fluid under pressure and whose volume varies as a function of the relative position of the roller (66, 82) and the rack (272). , 274, 292).
2. - Laminoir selon la revendication 1 , caractérisé en ce que la chaîne cinématique comprend une barre (72-78, 92) de transmission au rouleau (66, 82) d'un mouvement de déplacement de la crémaillère (272, 274, 292) selon son axe longitudinal (X72-X78, X92) de cette barre et en ce que la chambre de volume variable (C72, C74, C92) est définie entre - d'une part, la barre (92) ou une pièce (728) solidarisée à la barre (72) ; et2. - mill according to claim 1, characterized in that the kinematic chain comprises a bar (72-78, 92) for transmitting to the roller (66, 82) a movement of movement of the rack (272, 274, 292 ) along its longitudinal axis (X72-X78, X92) of this bar and in that the chamber of variable volume (C72, C74, C92) is defined between - On the one hand, the bar (92) or a part (728) secured to the bar (72); and
- d'autre part, la crémaillère (292) ou une pièce (724) rigidement fixée à la crémaillère (272). - On the other hand, the rack (292) or a part (724) rigidly fixed to the rack (272).
3.- Laminoir selon la revendication 2, caractérisé en ce que la chambre de volume variable (C72, C74) est définie à l'intérieur de la barre (72-78). 3. Rolling mill according to claim 2, characterized in that the variable volume chamber (C72, C74) is defined inside the bar (72-78).
4. - Laminoir selon la revendication 2, caractérisé en ce que la chambre de volume variable (C92) est définie, selon l'axe longitudinal (X92) de la barre (92), entre la crémaillère (292) et la barre. 4. - mill according to claim 2, characterized in that the variable volume chamber (C92) is defined along the longitudinal axis (X92) of the bar (92) between the rack (292) and the bar.
5. - Laminoir selon l'une des revendications précédentes, caractérisé en ce qu'il comprend un système (73, 93) d'alimentation de la chambre de volume variable (C72, C74, C92) en fluide sous une pression supérieure ou égale à 100 bars, de préférence supérieure ou égale à 200 bars, de préférence encore de l'ordre de 250 bars. 5. - Rolling mill according to one of the preceding claims, characterized in that it comprises a system (73, 93) for supplying the variable volume chamber (C72, C74, C92) fluid under a pressure greater than or equal to at 100 bar, preferably greater than or equal to 200 bar, more preferably of the order of 250 bar.
6. - Laminoir selon l'une des revendications précédentes, caractérisé en ce que la chaîne cinématique est configurée pour que, en cas d'irrégularité en saillie sur la surface (P2, P4, P6, P8) d'une pièce annulaire (P) façonnée par le rouleau (66, 82), le déplacement (F1 , F3) induit par cette irrégularité sur la barre (72-78, 92) tend à chasser (F2, F4) le fluide sous pression de la chambre de volume variable (C72, C74, C92), par réduction de son volume. 6. - Rolling mill according to one of the preceding claims, characterized in that the kinematic chain is configured so that, in case of irregularity protruding from the surface (P2, P4, P6, P8) of an annular piece (P ) shaped by the roller (66, 82), the displacement (F1, F3) induced by this irregularity on the bar (72-78, 92) tends to drive (F2, F4) the fluid under pressure from the chamber of variable volume (C72, C74, C92), by reducing its volume.
7. - Laminoir selon l'une des revendications précédentes, caractérisé en ce que le mécanisme à décharge fluidique (M72, M74, M76, M78) comprend un piston (724) solidarisé à la crémaillère (272) et dont une face (724B) définit la chambre de volume variable (C72, C74). 7. Rolling mill according to one of the preceding claims, characterized in that the fluidic discharge mechanism (M72, M74, M76, M78) comprises a piston (724) secured to the rack (272) and one side (724B). defines the variable volume chamber (C72, C74).
8. - Laminoir selon la revendication 2 et la revendication 7, caractérisé en ce que le piston (724) est monté coulissant à l'intérieur de la barre (72), selon l'axe longitudinal8. - Rolling mill according to claim 2 and claim 7, characterized in that the piston (724) is slidably mounted inside the bar (72), along the longitudinal axis
(X72) de la barre. (X72) of the bar.
9. - Laminoir selon la revendication 8, caractérisé en ce que le piston (724) est solidarisé à la crémaillère (272) par l'intermédiaire d'un support de crémaillère (720) et d'une tige (723) de liaison entre le support de crémaillère et le piston, le support de crémaillère et la tige de liaison étant également montés coulissants à l'intérieur de la barre (72), selon l'axe longitudinal (X72) de la barre. 9. - mill according to claim 8, characterized in that the piston (724) is secured to the rack (272) via a rack support (720) and a rod (723) connecting between the rack support and the piston, the support of rack and the connecting rod being also slidably mounted inside the bar (72) along the longitudinal axis (X72) of the bar.
10. - Laminoir selon la revendication 9, caractérisé en ce qu'il comprend des organes (727, 729) de guidage en translation, selon l'axe longitudinal de la barre (X72), du support de crémaillère (720) et/ou de la tige de liaison (723), à l'intérieur de la barre, notamment des patins de guidage. 10. - Rolling mill according to claim 9, characterized in that it comprises members (727, 729) for guiding in translation, along the longitudinal axis of the bar (X72), the rack support (720) and / or connecting rod (723) inside the bar, in particular guide shoes.
1 1 . - Laminoir selon l'une des revendications 8 à 10, caractérisé en ce que la chambre de volume variable (C72, C74) est définie entre la face (724B) du piston (724) et un couvercle (728) qui obture un volume interne (726) de la barre, à l'opposé du rouleau (66). 1 1. - Rolling mill according to one of claims 8 to 10, characterized in that the variable volume chamber (C72, C74) is defined between the face (724B) of the piston (724) and a cover (728) which closes an internal volume (726) of the bar, opposite the roller (66).
12. - Laminoir selon la revendication 2, caractérisé en ce qu'une partie (924) de la barre (92) est reçue de façon étanche dans une cavité interne (926) définie par la crémaillère (292) et en ce que la chambre de volume variable (C92) est formée par la portion de cette cavité non occupée par la barre. 12. - Rolling mill according to claim 2, characterized in that a portion (924) of the bar (92) is sealingly received in an internal cavity (926) defined by the rack (292) and in that the chamber of variable volume (C92) is formed by the portion of this cavity not occupied by the bar.
13. - Laminoir selon la revendication 5 et la revendication 12, caractérisé en ce que la chambre de volume variable (C92) est reliée au système d'alimentation (93) en fluide sous pression par un conduit (291 ) qui traverse la crémaillère (292). 13. - Rolling mill according to claim 5 and claim 12, characterized in that the variable volume chamber (C92) is connected to the supply system (93) in pressurized fluid by a conduit (291) which passes through the rack ( 292).
14. - Laminoir selon l'une des revendications précédentes, caractérisé en ce que chaque rouleau (66, 82) mobile en translation par rapport à un châssis secondaire (46, 48) est déplacé par un ensemble pignon-crémaillère (272-273, 274-275, 292-293-295) entraîné par un moto-réducteur électrique (172-178, 192, 194) monté de façon fixe par rapport à ce châssis, avec interposition d'un mécanisme à décharge fluidique (M72, M74, M76, M78, M92) dans la chaîne cinématique de transmission d'effort entre chaque crémaillère (272, 274, 292) et le rouleau (66, 82) entraîné par cette crémaillère. 14. - Rolling mill according to one of the preceding claims, characterized in that each roller (66, 82) movable in translation relative to a secondary frame (46, 48) is moved by a rack and pinion assembly (272-273, 274-275, 292-293-295) driven by an electric gear motor (172-178, 192, 194) fixedly mounted with respect to this frame, with the interposition of a fluid discharge mechanism (M72, M74, M76, M78, M92) in the kinematic transmission chain of effort between each rack (272, 274, 292) and the roller (66, 82) driven by this rack.
15. - Procédé de contrôle de la position d'au moins un rouleau (66, 82) de façonnage d'une face (P2-P8) d'une pièce (P) à conformer au sein d'un laminoir circulaire (2) qui comprend : 15. - Method for controlling the position of at least one roll (66, 82) for forming a face (P2-P8) of a workpiece (P) to be formed in a circular mill (2) including :
- un châssis principal fixe (4) ; - une paire de rouleaux (62, 66), respectivement interne et externe, destinés à façonner des faces radiales (P2, P4) interne et externe de la pièce et supportés par un premier châssis auxiliaire (46) monté sur le châssis principal ; - a fixed main frame (4); - a pair of rollers (62, 66), respectively internal and external, for shaping inner and outer radial faces (P2, P4) of the workpiece and supported by a first auxiliary frame (46) mounted on the main frame;
- une paire de rouleaux coniques (82, 84), respectivement supérieur et inférieur, destinés à façonner des faces frontales (P6, P8) opposées de la pièce et supportés par un deuxième châssis auxiliaire (48) monté sur le châssis auxiliaire qui le supporte ;  a pair of tapered rollers (82, 84), respectively upper and lower, for shaping opposite end faces (P6, P8) of the workpiece and supported by a second auxiliary frame (48) mounted on the auxiliary frame which supports it ;
- au moins un ensemble pignon-crémaillère (272-273, 274-275, 292-293- 295) de déplacement d'un rouleau (66, 82) par rapport au châssis principal ; et  at least one rack and pinion assembly (272-273, 274-275, 292-293-295) for moving a roller (66, 82) relative to the main frame; and
- au moins un moto-réducteur électrique (172-178, 192, 194) d'entraînement du pignon (273, 275, 293, 295) de l'ensemble pignon- crémaillère,  at least one electric gear motor (172-178, 192, 194) driving the pinion (273, 275, 293, 295) of the rack and pinion assembly,
ce procédé étant caractérisé en ce qu'il comprend des étapes consistant à : this method being characterized in that it comprises steps of:
a) alimenter en fluide sous pression une chambre de volume variable (C72, C74, C92) intégrée à un mécanisme de décharge (M72, M74, M76, M78, M92) intercalé dans une chaîne cinématique de transmission d'effort entre la crémaillère (272, 274, 292) et le rouleau (66, 82) déplacé par cette crémaillère, pour rigidifier cette chaîne cinématique en fonctionnement normal du laminoir (2), et  a) supplying fluid under pressure to a chamber of variable volume (C72, C74, C92) integrated in a discharge mechanism (M72, M74, M76, M78, M92) interposed in a kinematic transmission chain of effort between the rack ( 272, 274, 292) and the roller (66, 82) moved by this rack, to stiffen the driveline in normal operation of the rolling mill (2), and
b) évacuer (F2, F4) une partie au moins du fluide sous pression de la chambre de volume variable (C72, C74, C92), grâce à une variation dimensionnelle de la chaîne cinématique, en cas d'irrégularité sur la face (P2-P8) de la pièce (P) façonnée par le rouleau.  b) evacuating (F2, F4) at least a portion of the fluid under pressure from the variable volume chamber (C72, C74, C92), thanks to a dimensional variation of the kinematic chain, in the event of an irregularity on the face (P2 -P8) of the workpiece (P) shaped by the roll.
EP17777254.8A 2016-09-30 2017-09-29 Ring rolling mill with conformation rolls and process for controlling the position of a roll of such a rolling mill Active EP3519122B1 (en)

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PL17777254T PL3519122T3 (en) 2016-09-30 2017-09-29 Ring rolling mill with conformation rolls and process for controlling the position of a roll of such a rolling mill

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EP16306289.6A EP3300814A1 (en) 2016-09-30 2016-09-30 Ring rolling mill with conformation rolls and process for controlling the position of a roll of such a rolling mill
PCT/EP2017/074736 WO2018060399A1 (en) 2016-09-30 2017-09-29 Circular rolling mill with shaping rollers and method for controlling the position of a roller of such a rolling mill

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JP6722359B2 (en) 2020-07-15
KR20190055110A (en) 2019-05-22
CN109843467B (en) 2020-08-21
BR112019006291A2 (en) 2019-07-02
WO2018060399A1 (en) 2018-04-05
EP3300814A1 (en) 2018-04-04
US20190232348A1 (en) 2019-08-01
CN109843467A (en) 2019-06-04
RU2019108707A3 (en) 2020-11-24
BR112019006291B1 (en) 2023-04-18
EP3519122B1 (en) 2021-04-07
JP2019531198A (en) 2019-10-31
RU2742986C2 (en) 2021-02-12
ES2876162T3 (en) 2021-11-12
RU2019108707A (en) 2020-09-28
US11110499B2 (en) 2021-09-07
PL3519122T3 (en) 2021-10-25
KR102460419B1 (en) 2022-10-31

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