Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
  • B21C47/34—Feeding or guiding devices not specially adapted to a particular type of apparatus
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
  • B21B38/02—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B41/00—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
  • B21C47/02—Winding-up or coiling
  • B21C47/04—Winding-up or coiling on or in reels or drums, without using a moving guide
  • B21C47/06—Winding-up or coiling on or in reels or drums, without using a moving guide with loaded rollers, bolts, or equivalent means holding the material on the reel or drum
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H18/00—Winding webs
  • B65H18/08—Web-winding mechanisms
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
  • B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
  • B21B2003/001—Aluminium or its alloys
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B2015/0064—Uncoiling the rolled product
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B41/00—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters
  • B21B41/08—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters without overall change in the general direction of movement of the work
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2406/00—Means using fluid
  • B65H2406/30—Suction means
  • B65H2406/35—Other elements with suction surface, e.g. plate or wall
  • B65H2406/351—Other elements with suction surface, e.g. plate or wall facing the surface of the handled material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2601/00—Problem to be solved or advantage achieved
  • B65H2601/20—Avoiding or preventing undesirable effects
  • B65H2601/21—Dynamic air effects
  • B65H2601/211—Entrapping air in or under the material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2701/00—Handled material; Storage means
  • B65H2701/10—Handled articles or webs
  • B65H2701/17—Nature of material
  • B65H2701/173—Metal

Definitions

• the subject of the invention is a method and a device for stabilizing and guiding a strip product traveling at high speed in a longitudinal direction, in particular in a cold rolling installation for metal strips, more particularly thin sheets of aluminum.
• a cold rolling installation for a metal strip product generally comprises one or more rolling mill stands each comprising two working rolls bearing on support rolls and associated with means for controlling the running of the strip between the working rolls.
• the strip is unwound from a reel placed on an upstream side of the cage or cages and is wound on a winder placed on the downstream side.
• the installation further comprises numerous additional members such as means for introducing the strip into the rolling mill stands, means for adjusting the speeds of rotation of the various members and a number of deflector rollers which may have a position. adjustable and on which the strip is applied so as to be guided along a determined path.
• an installation for rolling very thin sheets, in particular aluminum generally comprises a single rolling stand operating from reel to reel, between an unwinder and a winder .
• a rolling mill cage comprises two spaced apart columns between which are mounted a set of rolls, for example, in the case of a quarto cage, two working rolls associated respectively with two support rolls.
• Each cylinder is rotatably mounted, at its ends, on bearings carried by chocks slidably mounted between the uprights of the columns of the cage and clamping means bearing on the chocks of the support cylinders make it possible to achieve the desired thickness reduction on the laminated strip. It is thus possible to obtain a very thin thickness and, for example, in the case of aluminum sheets, the thickness range can go from 3 to 300 micrometers.
• the equipment of the installation must, of course, be adapted to such thin thicknesses, in particular for winding the coil.
• FIG. 1 schematically represents an installation for rolling an aluminum sheet comprising a rolling stand A placed between an unwinder D carrying a reel Bi and a reel E on which a reel B 2 is formed after passage of the product M between the working rolls of the rolling stand A.
• the strip M On its path between the unwinder and the rewinder, the strip M is guided by a number of deflecting rollers D.
• a flatness measuring roller Di is placed downstream of the stand A in order to detect any defects at correct by acting on means for adjusting the rolling conditions.
• a bar feed roller D 2 of adjustable level, makes it possible to adjust the angle of winding of the strip on the flatness roller Di. This roller D 2 can be spread upwards to facilitate the engagement of the strip on the rewinder E.
• Figure 1 the installation of Figure 1 is shown only by way of example, other types of installation can be used.
• a tandem rolling can be carried out in a rolling mill comprising several cages placed successively on the path of the strip to achieve a gradual reduction in thickness or else a reversible rolling carried out alternately in one direction and in the other, the rolling mill being associated with two winders which operate alternately in unwinding and rewinding.
• the laminated strip can undergo a certain number of treatments, either upstream or downstream of the rolling and, in the most recent installations, it is sought to carry out these various treatments as much as possible in a continuous line.
• the small thickness of the laminated metal strip leads to a particular operation of the installation because the length of a coil can be several tens of thousands of meters and the duration a rolling pass can therefore take several hours. Under these conditions, there is no question of carrying out a reversible rolling.
• the object of the invention is to remedy such drawbacks by means of a method and a device making it possible to ensure the stability of the running and winding of the strip, even at very high rolling speeds and, thus, of considerably increase the productivity of an installation without significant modification of it.
• an air cushion is formed which, in the case of a deflector roller or bar feeder, can disturb the guide the strip, the latter being slightly raised and therefore able to move laterally.
• the tensile force that can be applied is relatively low and a suction nozzle placed close to the contact line between the strip and the coil could deflect the strip which, by sticking to the suction member, could be damaged or even torn.
• the invention therefore generally relates to a method and a device for stabilizing scrolling at high speed, in a longitudinal direction of a strip which is applied, from a contact line, on at least one angular sector of a rotating surface of revolution about an axis transverse to the direction of travel, and tangentially joining the rotating surface forming, on the upstream side in the travel direction, a limited dihedral, on one side by one external face of the rotating surface and the other, by an internal face of the strip along which part of the ambient air forms a boundary layer entrained with the strip towards the contact line, a deflection member being placed in the dihedral so as to modify the conditions of circulation of the air entrained with the strip, said deflection member having a first face turned towards the internal face of the strip and a second face turned towards the outer face of the rotating surface.
• the internal space of the deflection member is not connected to a suction fan but simply to an external zone being at atmospheric pressure, the circulation of the air thus taking place naturally, without any real suction, at the level of the deflection organ.
• the second face of the deflection member, turned towards the rotating surface is inclined relative to the latter, so as to form a convergent determining an increase in pressure of the air entrained with the rotating surface, of which a part is evacuated towards the external zone connected to the internal space by passing through at least one orifice formed in said second face.
• Such a stabilization device can be applied either to a deflector roller with a cylindrical profile determining a change in direction of the running plane of the strip, or to the winding of the strip in a coil in order to avoid the air entrainment between the superimposed turns.
• the air deflection member In the case of a coil winding, the air deflection member consists of a hollow profile, mounted on a support means adjustable according to the diameter of the coil, so as to maintain the deflection in an optimal position with respect to the internal face of the strip, as the latter is wound up in a reel.
• this support arm of the air deflection member has a variable length and is rotatably mounted around an axis parallel to the axis of the coil, said arm being associated with means for adjusting its orientation and its length as a function of the diameter of the coil, for positioning the profiled member inside the upstream dihedral.
• the adjustable support means of the deflection member is mounted on an wrapper associated with the reel to facilitate the start of winding of the strip, the support means being folded in the template of the wrapper when the latter is in the start winding position and unfolded after winding a few turns and spreading the wrapper, so as to place the deflection member near the contact line , at the end of the upstream dihedral.
• the invention also covers the use, in an installation for rolling metal strips, in particular aluminum, of such a stabilization device which can be placed upstream of at least one deflector roller, in order to ensure the 'direct application of the strip on the roller without interposing a layer of air.
• This deflector roller can advantageously be a flatness measuring roller, the device then making it possible to avoid disturbance of the measurement by entrainment of air between the strip and the roller.
• the invention can also be used advantageously for winding the laminated strip on a winder placed at the end of the line, the stabilization device then being placed upstream of the line of contact with the already wound reel in order to avoid the expansion of air entrainment between the turns and ensuring the guiding stability of the strip during winding.
• Figure 2 is a cross-sectional view, on an enlarged scale, of an air deflection member according to the invention, applied to the winding of a coil.
• Figure 3 shows, in elevation, the entire device fitted to a winder placed at the outlet of a rolling mill.
• FIG. 1 shows, schematically, the whole of an installation for rolling an aluminum sheet - which takes place from a Bi coil and is rewound, at the outlet of the rolling mill A to form a new coil B 2 .
• the strip M is guided by a plurality of deflection rollers which ensure the running stability, in particular, a flatness measuring roller Di and a bar feed roller D 2 .
• an extruder D 3 consisting of two fixed rollers framing a central roller of adjustable level, makes it possible to regulate the tension upstream of the rolling mill A.
• the rolling mill A shown diagrammatically in FIG. 1 and in more detail in FIG. 3, can be, for example, of the quarto type comprising two working rolls 1, V bearing, respectively, on support rolls 11, 11 'and each rotating around a shaft carried, at its ends, by chocks, respectively 12, 12 ', 13, 13' which are slidably mounted along vertical guide faces 14 formed on two fixed columns 10 constituting the stand of the rolling mill .
• the strip Downstream of the rolling mill, the strip passes successively over a flatness measuring roller 15 and over a bar feed roller 16 which is slidably mounted on the two columns 10 of the stand and whose position can be adjusted by a jack 17 according to the nature of the metal and the thickness of the strip, in order to adjust the angle of application on the flatness roller 15.
• the reel E on which the laminated coil B 2 is formed comprises, in a conventional manner, an expandable mandrel 2 mounted in cantilever on a frame 21 and rotated about its axis 20.
• the winder E is associated with a wrapper F mounted on a frame 22 articulated on the columns 10 of the rolling mill around an axis 23 parallel to the running plane of the strip M and which can rotate, under the action of a means not shown, between a raised position and a separated position.
• the wrapper F comprises an open part 24 which, in the raised position of the chassis 22, engages on the mandrel 2 of the winder E.
• the bar feed roller 16 is raised by the jack 17 in a spaced-apart position 16 'allowing the passage of the head Mi of the strip M- and its engagement on the mandrel 2.
• Known means arranged in the open part 24 of the wrapper F and not shown in the figure, support the head of the strip for facilitate the start of winding in superimposed turns.
• the wrapper F is moved aside by the jack 24 to place itself in the position shown in FIG. 3.
• a coil 3 is formed, the diameter gradually increases, as indicated in Figure 3.
• the strip M therefore tangentially connects to the coil 3, along a contact line 30 parallel to the axis 20 of the mandrel 2, forming a dihedral angle G with the external face 31 of the coil 3, facing towards 'upstream with respect to the direction of travel.
• FIG. 2 for example, which shows on an enlarged scale, the zone of winding of the strip M on the reel 3, there is shown, on the right, the diagram of variation of the speed vector (U) of the air which, from a distance (e) from the internal face 41 of the strip 4 passes from a zero value to the value (V) of the running speed of the strip 4, while remaining parallel to itself.
• a thickness of moving air 43 called the boundary layer in which a laminar flow occurs at a speed which gradually increases, approaching the strip 4, to reach the speed of the latter along its internal face 41. It is the same along the external face 42 of the strip.
• This boundary layer 43 accompanies the strip 4 in its travel and abuts against the coil 3 whose external face 31 faces upstream, that is to say opposite to the direction of travel, shape, with the internal face 41 of the strip 4, a dihedral G which converges towards a contact line 30 of the strip 4 with the last wound turn 32.
• This blocking, upstream of the contact line 30 of the air driven along the face 41 of the strip determines an increase of pressure which may cause a slight lifting of the web 4 and the introduction of a thin layer of air between the internal face 41 of the strip 4 and the coil 3.
• the idea of the invention is to provide aerodynamic conditions for air circulation in the upstream dihedral G making it possible to unhook the boundary layer 43 upstream from the contact line 30.
• This separation of the boundary layer 43 is obtained by evacuating to the outside part of the air flow entrained with the strip, by means of a deflection member 5 placed in the upstream dihedral G and extending between the internal face. 41 of the strip and the external face 31 of the coil, parallel to the contact line 30.
• This deflection member 5 consists of a hollow section having at least one face 50 facing the internal face 41 of the strip 4 and inclined relative to the latter, in the direction of travel, so as to form a convergent Ci, the cross section of which gradually decreases, causing an increase in pressure of the air entrained with the strip in the boundary layer 43.
• This inclined face 50 is provided with a plurality of orifices in the form of slots 55 which open into the internal space 51 formed inside the hollow profile 5.
• the latter is closed at its ends and provided with an orifice connected by a pipe 53 to an external zone 54 located, for example, at atmospheric pressure.
• the increase, by wedge effect, of the pressure in the convergent Ci therefore determines the passage through the slots 55 of part of the air entrained in the boundary layer 43 which escapes through the pipe 53 towards the area to lower pressure 54.
• the flow of air entrained towards the contact line 30 decreases and the boundary layer 43 is thus detached from the internal face 41 of the strip 4 to hang on the inclined face 50 of the deflection member 5 by forming a laminar flow current which escapes through the slots 55 and the pipe 53.
• the pressure difference between the two converging d, C 2 and the outlet 54 of the discharge pipe 53 determines a natural circulation of air passing through the slots 55, 55 '.
• the evacuation pipe 53 it may be preferable to connect the evacuation pipe 53 to a suction device.
• the shape of the hollow profile 5, in particular the profile and the inclination of the faces 50, 50 ′ and their optimal positioning with respect to the strip to be wound 4 and the contact line 30 can be determined empirically or by calculation so as to obtain the desired effect, by studying the air circulation conditions taking into account the running speed v of the strip 4, and the pressure drops in the profile 5 and the discharge circuit.
• the latter is associated with a wrapper F mounted on a frame 22 which can rotate about an axis 23 between a raised position, shown in FIG. 1, for which the wrapper is engaged on the mandrel 2 in order to facilitate starting of the winding and a lowered position, re shown in Figure 3, for which the wrapper is spaced from the mandrel 2 to allow the winding of the strip and the formation of the reel 3.
• the latter increases in diameter as the winding and the contact line 30 of the strip M with the coil 3 therefore departs from the axis 20 of winding. along a curve 34 shown in phantom in Figure 3.
• the deflection member 5 must follow the increase in diameter of the coil while remaining within a optimal position inside the dihedral G to allow the evacuation of the air entrained in the boundary layer.
• the deflection member 5 must therefore follow a curve 34 ′ similar to the path 34 of the contact line 30 while moving away from it, however, slightly to take account of the fact that the dihedral G gradually closes progressively as the winding.
• the support 6 can consist of two spaced apart arms arranged at the two ends of the profile 5 constituting the deflection member and being able to rotate around an articulated shaft 60, at its ends, on two sides of the chassis 22 of the wrapper F.
• Each arm 6 carries the body of a jack 61, the rod 62 of which is provided at its end with a part 63 for attaching the hollow profile 5.
• the latter is connected by a hose to a pipe fixed to the arm support 6 for the evacuation of the air sucked in through the slots 55, 55 ′.
• the chassis 22 of the wrapper F also carries a member 7 for controlling the rotation of the support 6, consisting of at least one lever articulated around an axis 70 and carrying a toothed sector 71 which meshes with a pinion toothed 64 integral in rotation with one of the two arms which constitute the support 6 and are secured in rotation.
• the other branch of the lever 7 is articulated on the rod of a jack 72 bearing on the frame 22 and which thus controls the rotation of the support 6 between a retracted position 6a, and a separated position 6b corresponding to the maximum diameter of the coil 3.
• the profile 5 and its two support arms are folded into the template of the chassis 22 of the wrapper F and therefore do not interfere with the establishment of the latter ci on the mandrel 2 for starting the winding.
• the control member 7 rotates the two arms of the support 6 to a position 6c for which the axis of the jack 61 is substantially tangent to the spool at the start of winding and the cylinder rod is advanced so as to place the deflection member in the desired position 5c near the internal face of the strip 4.
• the speed of rotation of the mandrel 2 is then increased to the level corresponding to the high speed rolling of the strip 4.
• the jacks 72 for controlling the rotation of the arm 6 and 61 for adjusting the radial position of the member deflection 5 are slaved to the variation in diameter of the coil 3 so as to follow the curve 34 ′ while remaining at the desired distance from the internal face 41 of the strip 4 and as close as possible to the contact line 30.
• the cylinders 61 and 72 are equipped with position sensors and controlled by an appropriate circuit so as to precisely adjust the position of the profile 5 as a function of the diameter of the coil which is itself determined from the number of mandrel 2 turns taking into account the thickness of the strip 4.
• the invention which has just been described in the case of a coil winder can also be applied to a deflecting roller, for example example, the flatness measuring roller 15.
• the strip M is then applied under tension to an angular sector of the roller 15 and the deflection member 5 is placed, as before, in the dihedral G between the strip 4 being winding and the part of the surface of the roller 15 placed upstream of the contact line 30.
• the deflector roller 15 having a constant diameter, the deflection member 5 remains in the same position relative to the roller and can be placed, for example, at the end of a fixed support arm.
• the deflection member 5 can be a hollow profile opening into a pipe 53 for discharging, towards the outside, of part of the air entrained in the boundary layer 43 in order to reduce the dynamic pressure at l end of the dihedral G, at the level of the contact line 30. This avoids the formation of an air cushion which, on the one hand, could cause a lateral floating of the strip on the deflector roller and on the other hand, in the case of a flatness roller, would risk disturbing the measurement.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Winding, Rewinding, Material Storage Devices (AREA)
• Winding Of Webs (AREA)
• Advancing Webs (AREA)
• Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
• Braking Arrangements (AREA)
• Heat Treatment Of Strip Materials And Filament Materials (AREA)
• Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
• Electroplating Methods And Accessories (AREA)

Applications Claiming Priority (3)

Publications (2)

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• 2001
  • 2001-11-12 FR FR0114619A patent/FR2832084B1/fr not_active Expired - Fee Related
• 2002
  • 2002-11-12 DE DE60225588T patent/DE60225588T2/de not_active Expired - Fee Related
  • 2002-11-12 US US10/494,358 patent/US7300018B2/en not_active Expired - Fee Related
  • 2002-11-12 AT AT02790556T patent/ATE388771T1/de not_active IP Right Cessation
  • 2002-11-12 CN CNB02826066XA patent/CN1296151C/zh not_active Expired - Fee Related
  • 2002-11-12 EP EP02790556A patent/EP1448322B1/de not_active Expired - Lifetime
  • 2002-11-12 WO PCT/FR2002/003869 patent/WO2003041885A1/fr active IP Right Grant
  • 2002-11-12 ES ES02790556T patent/ES2300496T3/es not_active Expired - Lifetime

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