Classifications

• • 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
  • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
  • B21B13/145—Lateral support devices for rolls acting mainly in a direction parallel to the movement of the product
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
  • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
  • B21B2013/025—Quarto, four-high stands
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
  • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
  • B21B2013/028—Sixto, six-high stands
• • 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
  • B21B2031/206—Horizontal offset of work rolls

Definitions

• Roll stand equipped with a control device sta ⁇ bility rolling method and associated
• the present invention relates to a roll stand equipped with a rolling stability control device according to the preamble of claim 1 and an associated rolling method according to the preamble of claim 12.
• the present invention is designed specifically to quarto type cages, sexto, Hi-18, X-HI® comprising two cy ⁇ lindres working, each disposed on both sides of a mill pass line a metal product such as a strip running longitudinally in said cage, said working cylinders being arranged between lateral support means for positioning at least latte ⁇ ral (or longitudinally taking into account the direction of travel) said work rolls at specific working positions in the rolling stand.
• the rolling parameter may be derived from a database or be measured from a signal Prove ⁇ ing of a measurement performed by an analyzing device of the band characteristics or the rolling plant, with an appendix able to work roll position or by a measurement of resulting forces on the tra ⁇ vail cylinders.
• an offset When changing the format or quality of rolled product, it is then possible to reposition the working rolls under an offset ("offset") in accordance with conditions suitable for rolling said product.
• FIG. 1 of the present invention reproduces a very descriptive example of FIG. 1 of EP2464470B1 where the regulation of the offset (0) is allowed by displacement means (see actuator (63)) following a modification of nominal rolling parameters. or a change in measurement values of position and effort such as those given by the me ⁇ sour device (64).
• the regulation of the offset is EFFEC ⁇ communally killed for working rolls Su conclusions ⁇ laughing and lower.
• the work rolls may have sudden jumps or other variations and unstable positions around the predefined offset, (or regulated as in the state of the art), and / or sudden jumps or other variations of efforts on the cy ⁇ that is to say between the longitudinal displacement means ⁇ ment as lateral supports arranged longitudinally on either side of each working cylinder.
• these jumps or other insta bilities ⁇ are not symmetrical between the cylinder tra ⁇ vail top and bottom of the cage of the rolling, which makes an offset regulating common way for a pair of cylinder working as in the state of the art in ⁇ sufficiently capable of harmonizing efforts of the entire cage.
• An object of the present invention is to maximize the lamination speed while maintaining a stable operating conditions of a roll stand of a metal product ⁇ lic scrolling comprising at least cylinders tra ⁇ vail upper and lower previously arranged at a predetermined gap and movable at least Parallel interface ⁇ LEMENT the direction of travel of the product and with respect to a point of origin.
• the said point of origin of the cage is defined as intersection of longitudinal axis and vertical axis, the longitudinal axis being defined as the pass line of the cage and the vertical axis being defined as not ⁇ at least one of the upper and lower intermediate cylinders transmitting a rolling force by direct contact on at least one of the working rolls.
• the present invention is therefore intended to compensate a difference in physical state of at least one of the work rolls with respect to a previous physical state when an increase in the rolling speed in stability guar ⁇ tie conditions rolling to the output of the black lami ⁇ a consistent quality product (such as thickness, surface state, etc.).
• such a di ⁇ vergence can have multiple causes such as déstabi ⁇ lisation of position of at least one of the work rolls around its position (provided as a "offset” or longitudinal offset at the point of origin of the cage), a lateral deformation (said cedging) of cage creating a change ⁇ tion of lateral play conditions between working cylinders and lateral support cylinders (said clamping hyperstatic or excess play), variations excessive effort (in particular longitudinal) and couples suffered by the cy ⁇ lindre working, tension variations in the product upstream and / or downstream of the stand interacting with at least one of the work rolls, sliding effects cy ⁇ lindre between working and product or between the rollers of the cage, thermal variations of the assembly of the cage.
• the said divergences are also local, that is to say individually affect each of the upper and lower work rolls in various forms.
• the Applicant introduces two explanatory figures 2 and 3 (a, b, c, d, e) respectively of one embodiment of a rolling mill core and having a set of five various parameters on a rolling stand, said measurements having a type of instability related to the work rolls.
• FIG. 2 shows an embodiment of a roll stand (type 18-Hi or X-Hi®) in partial side view (X, Z plane) having two upper and lower sets of rolling metal products (PM ) in the longitudinal direction (X) comprising:
• each of said working rolls being supported on each other laterally (in the direction longi ⁇ tudinale X) by one of two means for lateral support;
• each lateral support means (here on the example com ⁇ taking a side support cylinder (CALS1, CALIl) hand ⁇ held attached to the working cylinder (CTS, CTI), two ran ⁇ bearings lateral support rollers (GALS1, GALIl) maintained contiguous to said lateral support cylinder transversely (Y direction), each lateral support means provides that the lateral support cylinder and the two rows of rollers are dis ⁇ placed on a pivoting arm (BPS1) having a pivot axis parallel to the direction (Y), so as to be able to put in contact the lateral support cylinder with the working cylinder, said contact to be kept out of the hyperstatic domain,
• BPS1 pivoting arm
• This game can be measured by a distance sensor (KYKsup, KYKinf) such as a plunger disposed in the displacement beam. If, on the contrary, the lateral support means is subjected to an effort
• CTS CTI are in practice always arranged laterally offset manner at an “offset” (Off) from the axes of their roller platen interme diary respective ⁇ (CAIS, CAII).
• This configuration of rolls for rolling is effected by longitudinal adjustment of the support beams acting on the pivoting arms so as to have the support means ⁇ lateral in compliance with said offset,
• GCS1, GCIL, GCS2, GCI2 are disposed between each of the four beams of longitudinal displacement and engine thrust means longitudi nal ⁇ respective (not shown). These gauges thus deliver the longitudinal force (FSUP, Finf) here expressed in tons when a force exerted by a cylinder tra ⁇ vail is transmitted via the lateral support means to one of the beams associated with said gauge.
• the measured longitudinal forces to the said strain gauges have posi ⁇ or negative values.
• the positive or negative sign indicates that the working roll (for example CTS) imposes a force on one or the other of the lateral support means which frames it in the longitudinal direction (for example through the pivoting arms BPS1 or BPS2 and their cylinder and rows of ga ⁇ lets), knowing that ideally the working cylinder is in a non-hyperstatic mode between its lateral support means ⁇ ral.
• Figure 3 (a) has a sour me ⁇ (in hours, minutes, seconds) during about 11 minutes (the time of the corresponding passage to the rolling metal strip from a reel speed (m / s) scrolling through a cage for a metal strip undergoing a rolling.
• Said lateral support means have equal ⁇ a function able to move the said cylinder tra ⁇ vail at least parallel to the direction of scrolling product and dispose the sub an offset relative to the point of origin supra.
• the said working lindre ⁇ cy is arranged between the sou means ⁇ lateral tien under a sufficient distance to ensure that the cylinder lateral clearance allowing it to perfect turn ⁇ between said means for lateral support while guaranteeing a contact under an applied longitudinal force united ⁇ cally on one side of the working cylinder.
• Figure 3 (b) shows the said upper working roll exerts a force on one of the lateral support means, here about -10 tonnes before the interval (Pl).
• the negative value indicates that the cy ⁇ working lindre exerts a longitudinal force opposite the direction of travel of the strip.
• the longitudinal force (FSup) has a force deviation of 5 tons, then regains its initial value of about -10 tons: a divergence of physical state of said upper working cylinder, followed by a return to its initial state.
• the longitudinal force (FSUP) pre ⁇ feel a force deflection of about 60 tonnes, more Préci ⁇ cally -10 tonnes to 50 tonnes, which means that the physical state of the working cylinder changes in that the measure shows that it moves from the first to the second lateral support means of said working cylinder. Obvious instability of the physical state of the working cylinder is thus detected.
• Figure 3 (c) shows that said lower working roll exerts a force on one of the lateral support means, here about -10 tonnes before the interval (Pl).
• the negative value indicates that the cy ⁇ working lindre exerts a longitudinal force opposite the direction of travel of the strip.
• the force longitudinal (Finished) has a force deviation of 10 tons, then reaches a new value of about -20 tons: it is thus noted a divergence of physical state of said lower working cylinder, followed by a new physical state under constant effort of -20 tons.
• the force of the working cylinder exerted (Finf) on the lateral support means of said working cylinder was ⁇ dyed -80 tons, eight times more in absolute value than the va ⁇ their initial of -10 tons.
• Large force variations can then involve cage structure (deformation) effects (columns, support means and lateral displacement), or even worse breakages or other types of damage to cage internal elements.
• the operator decreased the tape rolling speed to return to conditions of less effort, tou ⁇ tefois gradually and unstable type of -80 to -10 tons tons.
• the rate of decrease of course implies a significant drop in the productivity ⁇ mining at the expense of the operator.
• FIG. 3 (d) still shows, according to FIG. 2, a measurement of a distance or longitudinal clearance sensor between the upper pivoting arm (BPS1) and the upper displacement beam (PDS1).
• ar ⁇ storage being intended to catch up a game of operation between the upper working cylinder and at least one of its first or second lateral support means.
• each said cylinder of tra ⁇ vail is disposed between two lateral support means (each comprising a pivot arm, a support cylinder and the two rows ⁇ Teral of rollers, see Figure 2) under a gap sufficient to ensure the working cylinder a lateral clearance allowing it to rotate perfectly between said means of lateral support while ensuring contact under a longitudinal force applied only one side ⁇ Lateral working cylinder.
• Figure 3 (d) shows that said upper swing arm has an upper longitudinal clearance
• Figure 3 (e) has a sour me ⁇ a distance sensor or of longitudinal play (KYKinf according to Figure 2) between the lower swivel arm (BPIl) and the lower displacement beam ( PDIl), this arrangement being intended to compensate for an operating clearance between the lower working roll and at least one of its first or second lateral support means.
• Figure 3 (e) shows that the lower said pivot arm has a lower longitudinal clearance (KYKinf) with one of the longitudinal displacement of beams, here a average value of about 3.00 millimeters before the interval (Pl).
• rolling stand of instability limits the maximum speed of rolling passes, and may at worst cause damage to ele ⁇ cage elements during operational use of lami ⁇ swimming, particularly also when rolled products suc cessively ⁇ present various physical properties. Also, during a first commissioning or a return to service after maintenance of a rolling line, such effects are currently very complex to predict and it is necessary for operators to start or restart. a rolling line under conditions of very safe settings, particularly in a speed of scrolling ⁇ reduced. After commissioning warranty as ⁇ rolled Duit have a desired quality (eg a constant thickness cage output), said instabili ⁇ ties may however persist and still compel the rolling stands to operate under limited modes vi ⁇ scroll hostess.
• the invention provides a roll stand having a pair of upper and lower work rolls (CTS, SIC), a pair of cy ⁇ lindres upper and lower support for a quarto configuration type, six-high, 18-Hi or X-HI®, d a pair of upper and lower intermediate cylinders (CIS, Cil) for a configuration of sexto, Z-High or X-HI® type and equipped with a rolling stability control device by positioning the work rolls for rolling a scrolling metallic product (PM) comprising:
• said upper and lower work rolls each acting on one of two faces of a metallic product moving in a horizontal direction along a longitudinal axis
• Upper and lower longitudinal displacement means ⁇ said upper and lower work rolls with respect to a vertical axis passing through at least one of the intermediate rolls transmitting a rolling force by direct contact on at least one of the work rolls, the longitudinal axis and the vertical axis defining a ⁇ tersection in a datum whose tra ⁇ vail cylinders are located laterally a distance called "offset";
• the measured parameter is linked to a phy ⁇ static state divergence of at least one of the working cylinders relative to a previous physical state, ideally stable under a predefined offset;
• the measured parameter comprises at least one compo value ⁇ longitudinal health of at least one of upper and lower force (FSUP, Finf) exerted by each cylinder tra ⁇ vail on the active measuring means coupled to said moving ⁇ actually in contact and under load load with said cylinder knowing that a game (to avoid a hy- perstatic state of working cylinder) is imposed between said cylinder and at least one of two longi ⁇ tudinal movement means (the one which is out of load force), each of ⁇ said displacement means being disposed longitudinally on either side of the said working roll
• FSUP, Finf upper and lower force
• Predefined patterns for detecting such divergence scenarios of at least one physical state of one or both upper and lower work rolls may also be stored in the control unit, in order to apply to the cage modes of operation. preventive repositionings of one or more said cylinders against rolling instabilities.
• Such a rolling stand is thereby made robust against any instability of rolling, in particular for diver ⁇ ments not concomitant physical states of the work rolls in the upper and lower cage part, and vi ⁇ scroll tesse (and hence the productivity of rolling) is therefore very advantageously increased.
• the Applicant has thus been able to improve the rolling stability control by means of a regulation dependent on at least two longitudinal stress parameters (Fsup, Finf) measured simultaneously on each of the active measuring means coupled to the means for moving each persons seeking work rolls ⁇ laughing and lower.
• Concomitant use of these two para ⁇ meters allowed indeed detect dynamic power ⁇ differences of physical upper and lower work rolls not only concurrent type, but also non-concurrent, particularly in increasing phase rolling speed.
• the re ⁇ gulation signal may comprise a logic, algebraic or arithmetic function of the longitudinal force components (FSup, Finf) respectively measured by each measuring means of the lower and upper work rolls.
• a very simplified regulation signal can thus comprise a function of a relative force value (FSup-Finf) between the two forces (FSup, Finf) respectively measured by each measuring means of the lower working cylinders and superior.
• the regulation signal may comprise a func ⁇ tion of an additive force value (FSup + Finf) of the two forces (FSup, Finf) respectively measured by each of the measuring means of the lower and upper cylinders.
• FSup + Finf an additive force value
• FSup, Finf two forces
• control signal may comprise a func ⁇ tion of at least one algebraic value or logic of a combi ⁇ bination either linear or non-linear force measured respectively by each of the measuring means of the lower and upper work rolls.
• the measured parameter can include:
• this parameter provides knowledge of the pre-positioning of the longitudinal displacement means, in particular at the beginning of a new program laminage.- couples at least one measurement value applied to the work rolls su ⁇ TECHeur and lower said value being type is rela tive ⁇ is absolute. This measurement allows detection
• the device of the invention further provides that at least two means of all types described measurement per cylinder are arranged in a plane transverse to the direction longi ⁇ tudinale of travel of the product.
• the diver ⁇ ments by deflection between the axes of the working rolls can also be better detected.
• the restore ⁇ can be done more easily and quickly by longitudinal displacement means being elements po ⁇ cylinder sitionment at least one cylinder end at least, to a series of elements of displacing cy ⁇ linder arranged consecutively in a transver ⁇ sal plane to the longitudinal direction.
• the moving elements comprise cylinders, rollers or lateral support pads cy ⁇ lindre working, that is to say laterally supporting the work rolls in a direction of thrust majoritai- surely oriented in the longitudinal direction, said elements being particularly suitable for a cage type 18-Hi or X-HI®.
• the device can be further improved in that it comprises at least four distance sensors instead of the two sensors (KIKsup, KIKinf) of FIG. 2.
• Each of the four longitudinal displacement beams then comprises at least one such sensor. distance sensor, ideally two trans ⁇ versalement.
• each displacement beam has such a distance sensor for measuring a clearance between each beam and the sou means ⁇ tien side (swing arm, lateral support cylinder and ran ⁇ elderly of support rollers) the location of each working roll in a repository of the cage under cedar is improved and thus allows in return a regulation de reposi ⁇ tionrati means more precise displacement of cy ⁇ working lndres.
• At least one set of distance sensor is arranged in each of four displacement means disposed Lateral ⁇ LEMENT of both sides of the upper work rolls and lower, that is to say in particular between four longitudinal displacement beams belonging to said means, each of said beams acting on one of the four movable lateral support means of the upper and lower working rolls.
• the roll stand according to the invention also enables implementation of a positioning control method cy ⁇ lindre upper working and lower a lami cage ⁇ swimming of a metal product in said longitudinal horizontal scrolling, for which a first parameter (Fsup) is measured as a longitudinal component force exerted by a first of the two working rolls on its respective active measuring means, and is then transmitted to the control unit acting on the longitudinal displacement means.
• a first parameter Fsup
• ⁇ nal said first working cylinder at least as soon as the first parameter out of a defined tolerance range.
• said control method provides that a second parameter (Finf) is simultaneously measured as a longitudinal component force exerted by a second of the two working rolls on its active measuring means res ⁇ pective, and is then transmitted to the control unit acting on the longitudinal displacement means of the working rolls, at least as soon as the second parameter or a difference between the first and the second parameter comes / goes out of a defined tolerance interval.
• a second parameter Frinf
• This taking into account of the pre ⁇ Mier and the second parameter in the upper part and NCI ⁇ cage higher advantageously makes it possible to allow meil ⁇ their control when no concomitant differences in physical state of the upper and lower work rolls, as shown by the curves of Figure 3. in other words, the method thus provides that all means of upper and lower longitudinal movement are actuated indivi dually ⁇ to reposition the working rolls su- lower and lower under individual offsets depending on the control signal.
• a set of subclaims also provides advantageous embodiments of the invention.
• FIG. 6 Partial view from above of said cage according to FIG. 4 or 5
• FIG 4 shows an embodiment of a black lami ⁇ cage according to the invention, here type 18-Hi or X-HI®.
• the cage is shown in a side view, here for example ozza ⁇ rateur side (or motor side where extensions and drives are provided to drive at least rolls of the cage).
• the said roll stand has, on either side of the passing line of the metallic product (PM), a pair of upper and lower bearing rolls (CAS, CAI), a pair of upper and lower intermediate cylinders (CIS, Cil), a pair of working cylinders (CTS, CTI).
• the cage is equipped with a rolling stability control device by positioning the work rolls for rolling a metal product (PM) in a rolling fashion and comprises:
• At least four longitudinal displacement means (MDS1, MDS2, MDI1, MDI2) of at least one of said cy ⁇ workinglinders with respect to an axis vertical (Z) passing through at least one of the intermediate cylinders transmits ⁇ a rolling force by direct contact on at least one of the working cylinders, the longitudinal axis (X) and the vertical axis (Z) defining a intersection in a point of origin (0) of which the work rolls are located laté ⁇ rattle to a said distance "offset",
• each upper and lower working roll is thus longitudinally disposed between at least two of the upper or lower displacement means
• - measuring means MMS1, MMS2, MMIL, MMI2 of at least one parameter (P) measured, said measured parameter is transmitted to a control unit (UC) supplying a signal regula ⁇ (Ssupl, Sinfl , Ssup2, Sinf2) to the longitudinal displacement means,
• the measured parameter is related to a state of phy sical ⁇ divergence of at least one of the work rolls relative to a physical called stable condition
• the measured parameter comprises at least one longitudinal compo ⁇ value of at least one of the forces (FSupl, FInfl, Fsup2, Finf2) exerted by each working roll on the active measuring means coupled to the actual displacement means in contact and load under load with said cy ⁇ lindre knowing that a game (to avoid a hyperstatic working cylinder state) is imposed between said cylinder and at least one of the two means of displacement (the one that is out load effort), each being disposed longitudinally on either side of the said cylinder tra ⁇ vail.
• the forces FSupl, FInfl, Fsup2, Finf2
• all the means of upper and lower longitudinal displacement are operable individually to repo ⁇ sitionner the upper and lower work rolls (CTS CTI) under individual offsets (Offs, offi) in dark ⁇ the control signal such that 5 shown in FIG. 5 as a zoom of the central part of the cage according to FIG. 4.
• Each upper and lower working roll can thus individually or not undergo one of the physical state divergences that are transmitted in particular by various longitudinal forces due to the multiple causes mentioned above in the present invention.
• Under a given offset, and as a function of at least one initiating divergence it is then possible to provide correctional diagrams of the forces applied to each working roll by modifying at least one of the longitudinal displacement means.
• this modifica ⁇ can lead to temporarily change the offset of each work roll, but this transitional phase aims to balance the forces depending on the physical condition of all and each of the work rolls upper and lower.
• the re-regulation ⁇ signal may be a logic function, algebraic or arith ⁇ the longitudinal components of force (FSupl, FInfl, Fsup2, Fsup2) respectively measured by each means of measurement of the lower and upper cylinders respectively, according to their active or passive state.
• corrections methods are applied to means of longitudinal MOVE ⁇ cement to offset instability party ⁇ culière.
• control signal may advan ⁇ tageusement be or include a function of a force value related [(Fsupl or Fsup2) - (Finfl or Finf2)] between the two forces (FSUP, Finf) respectively measured by cha ⁇ cun means for measuring the lower and upper rolls, whereby: (Fsup) is the measurement value of one of the forces
• the regulation signal can be or include a function of an additive force value (Fsup + Finf) of the two forces (FSup, Finf) respectively measured by each of the measurement means of lower and upper cylinders.
• control signal is a function of at least one will ⁇ the algebraic logic or a combination either linear or nonlinear measured forces by respectively cha ⁇ cun of means for measuring lower and Su regards cylinders ⁇ Procedure.
• effects of instabilities can be de ⁇ ⁇ ected under complex conditions requiring an approach for example non-linear as already mentioned.
• FIG. 6 shows a partial top view of said cage according to Figures 4 and 5, wherein in part, the means for longitudinal movements are more precisely Y crit ⁇ s.
• the said longitudinal displacement means are cylinder positioning elements from at least one end of a cylinder to a minimum, up to a series of cylinder displacement elements arranged in a conventional manner. consecutive in a transverse plane (Y) to the direction longitudinal (X).
• the movement members comprise rolls, rollers or lateral support pads tra ⁇ vail cylinder, that is to say laterally supporting the work rolls in a direction of thrust my oritairement orien ⁇ ted in the longitudinal direction , said elements being particularly adapted to a cage type 18-Hi or X-HI®.
• Figure 6 illustrates an example of the upper working roll (CTS) to be brought into lateral contact with the longitudinal displacement means (MDS1) said means for ⁇ longitudinal placement (MDS1) comprising successive ⁇ since the working cylinder:
• BPS1 lateral support rollers
• BPS1 an upper pivoting arm (BPS1), whose function is a pivot of the assembly of the upper lateral support cylinder (CALS1) and rows of lateral support rollers (BPS1) relative to the working cylinder (CTS) so as to to put them in contact in case of support;
• CAS1 upper lateral support cylinder
• CTS working cylinder
• PDS1 motorization ⁇ tion
• the transverse drives may be driven centrally or separately, in particular to correct axis tilting effects of the work roll relative to the transverse axis (Y).
• FIG. 6 further introduces additional means of measurements coupled to the control unit (UC) as feasible for the rolling mill stand mode according to the invention:
• the upper longitudinal force measuring means (see MMS1 to the left of the cage according to Figure 4) is for example réa ⁇ lized by a strain gauge (GSC1, GSC1 ') disposed between each engine and the upper displacement beam ⁇ higher .
• the parameter (P) measured comprises at least one longitudinal component value of at least one of the forces (FSupl) exerted by the working cylinder Su regards ⁇ laughing on the active measuring means coupled to the surround of dépla- actually during a contact and under ef ⁇ strong load with said work cylinder.
• the parameter (P) measured thus comprises at least one measurement value of longitudinal displacement (and axial if inclination with respect to transverse axis Y) of the lower and upper working rolls, the said value being of either relative type or absolute.
• the parameter (P) measured thus comprises at least one measurement value of play and contact between the upper working rollers and its lateral support roll ⁇ ral.
• the parameter (P) comprises in the example of FIG. 6 a plurality of measured parameters (longitudinal forces, distance measurement, gap or clearance measurement) which advantageously make it possible to characterize the state more precisely.
• the forces experienced by the work roll are measured using the longitudinal force measurement.
• the signal (Ssupl, Ssupl ') regulation issued by the control unit (UC) to the means of longitudinal displacement is then a logic function, arithmetic or algebraic multiple signals to kind com ⁇ plementary to detect at least one critical difference to the physical condition of the working cylinder and not to confuse it with a set of cylinder change without impact for a given offset in a field strength permitted.
• FIG. 7 shows an example of extended parameters of complementary measurements adapted to a measurement of the physical state divergence of at least one of the working cylinders.
• Figure 7 shows zoomed the sensor (KYKS1) type measurement of deviation between the pivot arm and the displacement beam.
• Figure 7 finally shows two means of measures comple ⁇ tary separate but contributing at least partially over the longitudinal force measurement:
• the parameter (Pc) measured thus comprises at least one torque measurement value applied to the upper and lower working rolls, the said value being of either relative or absolute type.
• the method called rolling stability control according to 1 thus provides that the first parameters sup ⁇ plementary are simultaneously measured as the longitudinal position of the centers of two working rolls Su 08 ⁇ and lower compared to the vertical axis (Z), then are transmitted to the control unit acting on the longitudinal displacement means of said work rolls, at least as soon as the relative distance between two of said para ⁇ meters comes out of a defined tolerance range.
• Said method of laminating stability control according to 1 the invention also provides that the second parameters addi ⁇ tional (Pc) are simultaneously measured as transmission torques acting on each of the two cylinders of upper and lower work, and then are transmitted to the control unit acting on the longitu ⁇ ⁇ dinal displacement means of said working cylinders, at least as soon as the relative deviation between two of said parameters comes out of a defined tolerance ⁇ tervalle.
• Pc second parameters addi ⁇ tional
• the said rolling stability control method according to the invention also provides for first parameters plementary (Pt) are simultaneously measured as me ⁇ safe of metal product traction on at least one of the working rolls, and at least as soon as the relative difference between two of said parameters out of a sheet interval ⁇ rance defined.
• Said method of controlling roll stability according to 1 the invention also provides that the second parameters addi ⁇ tional (Xkyksl) are simultaneously measured as play and contact between the lateral support means of upper and lower work rolls and the beams displacement ⁇ longitudinal ment, then are transmitted to the control unit acting on the longitudinal displacement means of said working cylinders, at least as soon as the relative difference between two of said parameters comes out of a tolerance range ⁇ rance defined.
• the second parameters addi ⁇ tional (Xkyksl) are simultaneously measured as play and contact between the lateral support means of upper and lower work rolls and the beams displacement ⁇ longitudinal ment, then are transmitted to the control unit acting on the longitudinal displacement means of said working cylinders, at least as soon as the relative difference between two of said parameters comes out of a tolerance range ⁇ rance defined.
• Figure 8 shows a multi-cages control method to stabilize the rolling according to the invention, for which the rolling mill stands according to the invention are arranged sé ⁇ quentiellement longitudinally.
• UC con trol ⁇
• the control unit acts not only on the longitudinal displacement means of at least two rolling stands respectively arranged upstream and downstream of each other and, in addition, acts on rolling process parameters, for example by changing inter-cage strokes in scrolling; by redistribution cage vertical clamping value over several cages, by changing read ⁇ brification in one of the cages, etc.
• the aim being to reduce the rolling instabilities if at least one of the cages had to present, while respecting the qualitative criteria of the final rolled product, especially for higher ⁇ mining speeds.
• control unit (UC) can thus act in the form

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• 2017
  • 2017-03-31 EP EP17290048.2A patent/EP3381576A1/de not_active Withdrawn
• 2018
  • 2018-03-21 KR KR2020197000075U patent/KR200496484Y1/ko active IP Right Grant
  • 2018-03-21 WO PCT/EP2018/057085 patent/WO2018177827A1/fr active Application Filing
  • 2018-03-21 JP JP2019600142U patent/JP3230298U/ja active Active
  • 2018-03-21 EP EP18714190.8A patent/EP3600708B1/de not_active Revoked
  • 2018-03-21 CN CN201890000687.0U patent/CN212143934U/zh active Active

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