Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B28/00—Maintaining rolls or rolling equipment in effective condition
  • B21B28/02—Maintaining rolls in effective condition, e.g. reconditioning
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B28/00—Maintaining rolls or rolling equipment in effective condition
  • B21B28/02—Maintaining rolls in effective condition, e.g. reconditioning
  • B21B28/04—Maintaining rolls in effective condition, e.g. reconditioning while in use, e.g. polishing or grinding while the rolls are in their stands

Definitions

• the present invention relates to the cleaning of rolling mill rolls, in particular skin-pass rolling mills, implemented at the outlet of continuous galvanizing lines, by high-pressure jet.
• a skin-pass mill comprises a pair of support rollers on which a pair of work rolls are supported between which a galvanized strip is laminated.
• these particles can print on the coating of the strip with each rotation of the rolls and can sufficiently alter the surface quality so that the product becomes unsellable or needs to be decommissioned.
• JP 9262607 in which are implemented mechanized cleaning means of the cylinders by pressurized spraying detergent fluids.
• these devices use low-pressure, wide-jet spray nozzles which, if they are effective enough to degrease lubricant coatings due to the detergent effect of the sprayed liquid, are not, however, effective enough to remove particles adherents, especially zinc particles.
• EP 0 995 504 discloses a cleaning device comprising moving lances, capable of moving along the cylinder, that is to say parallel to its axis of rotation. This arrangement imposes a perfect adaptation of the speed of movement of the lance to the speed of rotation of the cylinder according to the impact width of the jet.
• the present invention proposes a solution that makes it possible to optimize the use of spraying devices in order to reduce the consumption of fluids - and thus the discharges - and to avoid wasted time.
• the invention relates to a method of cleaning a roll of a rolling mill, comprising a cleaning step in which a nozzle operates in the cleaning regime while being moved parallel to the axis of the cylinder according to a cleaning speed.
• the method is essentially characterized in that it further comprises a determination step in which is determined, on the cylinder, at least one working zone delimited by a starting position of work and a position of end of work, and in that the cleaning step is limited to the work area.
• the invention also relates to a device for cleaning at least one rolling mill roll, capable of implementing the method according to the invention.
• the device comprises:
• a cleaning nozzle configured to pressurize a cleaning product with the cylinder to be cleaned
• the device is essentially characterized in that it further comprises: means for determining at least one working area delimited by a start of work position and an end of work position, and
• FIG. 1 illustrates a cross-section of a embodiment of the device according to the invention
• FIG. 2a illustrates an embodiment of an axial adjustment device according to the invention
• FIG. 2b illustrates a section along the axis XX of FIG. 2A
• FIG. 1 illustrates a cross-section of a embodiment of the device according to the invention
• FIG. 2a illustrates an embodiment of an axial adjustment device according to the invention
• FIG. 2b illustrates a section along the axis XX of FIG. 2A
• FIG. 1 illustrates a cross-section of a embodiment of the device according to the invention
• FIG. 2a illustrates an embodiment of an axial adjustment device according to the invention
• FIG. 2b illustrates a section along the axis XX of FIG. 2A
• FIG. 3A illustrates the working and rest positions for a lance and two work areas
• Figure 3B illustrates the working and rest positions for two lances and two work areas
• Figure 3C illustrates the work and rest positions for a lance and a work area
• Figure 4 illustrates another embodiment of the device according to the invention.
• a metal strip 1 to be rolled passes between the working rollers 2a, 2b of a skin-pass mill.
• These working cylinders are themselves supported by support cylinders 3A, 3B.
• the device according to the invention comprises a cleaning nozzle 61 mounted on a lance and configured to pressurize a cleaning product to the cylinder to be cleaned.
• At least one nozzle is provided for cleaning at least one cylinder, so that a nozzle can clean several cylinders and several nozzles clean a single cylinder.
• Each lance is equipped with at least one nozzle, in this case a single nozzle.
• At least one lance 6a ensures the cleaning of the upper working cylinder 2a, and at least one other lance 6b ensures cleaning the lower working cylinder 2b.
• at least one lance 7a for cleaning the upper support cylinder 3A, and likewise at least one other lance 7b can be provided to clean the lower support cylinder 3B.
• At least one cylinder (or each cylinder) can be cleaned by a plurality of lances, in this case two.
• the invention aims to clean primarily at least one of the working rolls.
• the lances 6a, 6b for cleaning at least one of the working cylinders comprise a spraying nozzle 61, and a body 62 supplied with cleaning product, in this case a fluid under pressure by a flexible pipe 63.
• the body 62 is supported by an axial adjustment device 64 itself carried by means for moving the nozzle, in this case a translation device 65.
• FIGS. 2A and 2B An example of an axial adjustment device 64 is illustrated in FIGS. 2A and 2B in which the translation and rotation movements are shown schematically by solid arrows.
• the axial adjustment device 64 comprises a support
• the pivoting of the support 641 relative to the slide 652 can be motorized, for example with a servomotor. It is then possible in this embodiment to use only two swivel lances, each respectively cleaning a working cylinder 2 and a support cylinder 3.
• a first control member 643 ensures the adaptation to the diameter of the cylinders.
• On the support 641 is mounted another slide 642 capable of moving parallel to the axis of the lance 6a,
• the slide 652 can be moved with a belt system as shown in FIG. 2A, or with a chain, or with a ball screw.
• the drive is advantageously provided by a servomotor.
• the slide 652 is a carriage guided on a crossbar 651 by rollers.
• the translation device 65 comprises the cross member 651 fixed on the chassis of the skin-pass mill and the slide 652 capable of moving parallel to the longitudinal axis of the cylinder 2a, 2b under the action of a second control member 653 fit to ensure the displacement of the axial adjustment device 64 carrying the lance 6a, 6b parallel to the axis of the working cylinder 2a, 2b.
• first control member 643 and the second control member 653 are the same.
• the nozzle is moved in translation, possibly back and forth, parallel to the axis of rotation of the cylinder to be cleaned, according to a first speed.
• the first speed is slaved to at least one of the following parameters: diameter of the cylinder to be cleaned, speed of rotation of said cylinder, and impact width of the jet emitted by the nozzle on said cylinder.
• This control of the speed during the cleaning phase is for example implemented by the control member 653.
• the control member 643 of the axial adjustment 64 positions the nozzle 61 at the required distance from the surface 21 of the working roll 2a, 2b.
• the control member 643 for adjusting the position of the nozzle with respect to the surface of the cylinder can be actuated by a hydraulic or pneumatic cylinder, can also be equipped with a position detector or, alternatively, by a servomotor driving a wheel mechanism and worm, rack or belt.
• the control member 653 of the translating device 65 moves the nozzle 61 at the required and controlled speed along the surface 21 of the working roll 2a, 2b so as to to ensure, over the cylinder turns, an optimal recovery of the impact of the cleaning jet, so that the entire surface to be cleaned thereof is covered.
• the invention furthermore comprises means for determining at least one working zone delimited by a start of work position and an end of work position on the cylinder to be cleaned, and means for limiting the cleaning step to said zone. working.
• a cylinder may comprise a plurality of work areas.
• the means for determining at least one working area are optical means configured to obtain at least one image of the rolls and / or the web.
• Each work area may include a recovery area R.
• the optical means comprise at least one camera 8a, 8b, 8c, 8d of which the image is transmitted to a control screen present in a control cabin of the rolling mill.
• An operator can then appreciate the transmitted images and determine the start and end positions for each work area.
• the determination of the work areas is implemented automatically by a surface defect detection system 10a, 10b (FIG.
• An illuminating device 101 illuminates the coated strip
• a high-definition CCD camera 102 captures the image of the moving tape.
• Such devices are known, for example in the patent application EP 0 974 833.
• the image acquired by the CCD camera 102 is transmitted to a filter unit 103 whose function is to eliminate the distortions due to vignetting and nonuniformity of illumination.
• the filtered images are then processed in an image processing unit 104 of edge-detection or gray-scale type which makes it possible to highlight the more contrasted zones considered as "suspect zones", that is to say probably containing particles to clean.
• image processing unit 104 of edge-detection or gray-scale type which makes it possible to highlight the more contrasted zones considered as "suspect zones", that is to say probably containing particles to clean.
• image processing unit 104 of edge-detection or gray-scale type which makes it possible to highlight the more contrasted zones considered as "suspect zones", that is to say probably containing particles to clean.
• it is not mandatory to implement sophisticated models of morphological analysis to discriminate different forms of defects.
• the cleanliness of the cylinder is determined by a step of measuring the profile of the surface of said cylinder.
• the device comprises means for determining at least one zone to be cleaned, said means for determining at least one zone to be cleaned comprising means for measuring the surface profile of said cylinder by triangulation by a sheet or a laser beam, the adhesions of foreign bodies (zinc particles, lubricating products, etc.) being measured as variations of the measured profile.
• the product scanCONTROL 2800 from the company MICRO EPSILON for the measurement of the surface profile.
• a laser line is projected on the surface of the cylinder to be cleaned.
• a return optic reproduces the reflected light of this laser line on the matrix of a camera, in this case CMOS.
• a controller calculates not only the distance information (z-axis), but also the actual position along the laser line (x-axis), and outputs both results in a two-dimensional coordinate system.
• a triangulation sensor by laser beam or web may be mounted on the lance holder 62 It sweeps the surface of the rotating cylinder by high speed movement of the slide 652 on the slideways 651 and delivers position information of the fouled areas to be cleaned with reference to the displacement encoder of the slide 652.
• the size of the beam is for example from 1 to 150 mm, and preferably from 10 to 100 mm.
• the device according to the invention further comprises air blowing means, in this case a compressed air blowing nozzle cooperating with said means for determining at least one zone to be cleaned, in order to dry the surface. of the cylinder to be analyzed.
• air blowing means in this case a compressed air blowing nozzle cooperating with said means for determining at least one zone to be cleaned, in order to dry the surface. of the cylinder to be analyzed.
• a lid serves to protect the triangulation window during the cleaning steps.
• the visual or automatic detection of defects makes it possible to define the limits of a working zone 20, 21 or an area to be cleaned 10, 11, 12.
• a work area 20, 21, 22 includes a work start position, in this case
• a work zone includes an area to be cleaned possibly increased by one or two areas of recovery R.
• An area to be cleaned 10, 11 (hatched area FIGS. 3A, 3B, 3C) is delimited by an area start position to be cleaned, in this case - B and G in FIG. 3A,
• the position A represents a rest position for a first lance 6 (FIGS. 3A, 3B, 3C), and the position A 'represents a rest position for a second lance 6' (FIG. 3B).
• FIG. 3A illustrates an embodiment in which the cleaning step is implemented by a single launches 6.
• a cylinder 2 comprises a first area to be cleaned 10 and a second area to be cleaned 11.
• the areas to be cleaned correspond to the ends of the cylinder 2 which are not in contact with the rolled strip 1, and are defined respectively to the areas to be cleaned, a first work zone 20 and a second work zone 21 each of which comprises a recovery zone R, in this case of the same dimension.
• FIG. 3B illustrates a variant of FIG. 3A in which the same areas are to be cleaned and the same working areas are defined, but the cleaning is implemented respectively by a first lance 6 and a second lance 6 '.
• the positions A ', B', C are symmetrical positions A, B, C of Figure 3B for the second lance 6 '.
• the rest positions A and A ' can be located on the same side of the cylinder 2.
• FIG. 3C illustrates an embodiment in which the cleaning step is implemented by a single lance 6.
• a cylinder 2 comprises a zone to be cleaned 12 corresponding to the surface of the laminated strip 1.
• a work zone is defined 22 comprising in this case a first and a second overlap zone R, located at each end of the width of the laminated strip 1.
• a cleaning nozzle is positioned beforehand in a position of rest A.
• the nozzle In a transport step, the nozzle is moved parallel to the axis of the cylinder from an end-of-work position, and / or to a starting position of work.
• the cleaning step can, thanks to the invention, be limited to this area of work.
• the limitation is implemented by a transport step during which the nozzle operates in a regime different from the cleaning regime, and is moved parallel to the axis of the cylinder from an end of work position, and / or until 'to a work start position.
• the nozzle operates in a regime different from the cleaning regime.
• the operating speed is characterized by at least one of the following parameters: speed of movement, flow delivered by the nozzle, and pressure of the cleaning fluid at the outlet of the nozzle.
• the displacement of the nozzle outside said working zone is carried out at a second speed, referred to as the transport speed, different from the first speed, referred to as the cleaning speed.
• the second speed is not slaved to the speed of rotation of the cylinder, and preferably maximum depending on the means for moving the nozzle.
• the flow rate that is to say the amount of cleaning product delivered by the nozzle per unit of time, is different from the cleaning flow, in this case lower, delivered during the cleaning step.
• the cleaning product is applied to the cylinder to be cleaned under a second pressure different from the first (cleaning pressure), in this case less than zero pressure. (cutting off the cleaning agent supply).
• cleaning pressure in this case less than zero pressure.
• the control member 653 of the axial adjustment device 65 positions the nozzle 61 at maximum speed along the surface 21 of the working cylinder 2a, 2b in order to start and stop cleaning exactly where it is needed.
• the lance 6 moves at maximum speed from its rest position A to the cleaning start position B of a dried emulsion deposit 9a corresponding to an edge of the cylinder table and then ensures cleaning at a controlled rate of cleaning from B to C, will then be positioned at maximum speed at the beginning D of the second dried emulsion deposit 9b and then cleaning at a controlled cleaning speed from D to E and finally returns to maximum speed at the rest position A.
• the cover R adjusts the work area.
• the lance 6 goes at maximum speed from its rest position A to the work start position I and then performs cleaning at a controlled cleaning speed from I to J in order to clean the zinc particles. adhered by the band 1, then returns to maximum speed at its rest position A.
• the working area 22 comprises a first upstream zone, covering, extending from the working start position I up to the zone start position of the zone to be cleaned K, and a second zone, downstream, of overlap extending from the end of zone position of the zone to be cleaned L to the end of work position J.
• a control unit 105 determines the beginnings and ends of areas to be cleaned by possibly adding within a working area a covering R to the contours of the suspect zones as soon as they appear and delivers to the actuators 653 the displacement commands (cleaning regime in a different work area and regime outside the work area).
• control unit 105 delivers to the actuators 653 displacement commands (cleaning regime in a work zone and a different speed outside the work zone) making it possible to ensure depending on the case, the cleaning of the full width of a cylinder or the only width corresponding to that of the contact with the increased band of one or more covers R or the only end portions of the cylinders which are not in contact with the band increased overlaps R ( Figures 3A, 3B, 3C).
• the triggering of the cleaning operation can be performed automatically or manually.
• the invention is not limited to the previously described embodiments. Other variants are possible, for example:
• lances 7a, 7b can be used to also clean the bearing cylinders. In this case, they can be attached to the same slide 652 as the lances 6a, 6b.
• the bearing rolls 3A, 3B are changed less frequently than the working rolls 2a, 2b and the adjustment of the distance between the nozzle 71 and the surface 31 of the roll does not necessarily require it, the lances 7a , 7b may also have their own axial adjustment device.
• the device further comprises lubricating emulsion spray bars 4a, 4b for lubricating the gap 5.
• a CCD camera can be installed integral with each lance body 62.
• Each camera acquires images of the surface of the rolls (working and support if the support 641 is pivotally mounted on the slider 652 in a motorized manner, as seen previously) during the rolling stages where the cleaning steps are not implemented. These images are processed in a conventional manner (Automatic Surface Inspection System) and the contrast variations identified after treatment, as being soils, control the activation of the cleaning lances.
• a diaphragm advantageously protects the camera lens during cleaning.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
• Cleaning In General (AREA)
• Cleaning By Liquid Or Steam (AREA)

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Citations (5)

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• 2007
  • 2007-04-18 FR FR0702813A patent/FR2915118B1/fr not_active Expired - Fee Related
  • 2007-12-20 EP EP07871988A patent/EP2134480B1/fr active Active
  • 2007-12-20 BR BRPI0721581-9A patent/BRPI0721581A2/pt not_active IP Right Cessation
  • 2007-12-20 WO PCT/FR2007/052577 patent/WO2008129141A1/fr active Application Filing
  • 2007-12-20 CN CN2007800526208A patent/CN101646507B/zh not_active Expired - Fee Related
  • 2007-12-20 KR KR1020097021614A patent/KR101115134B1/ko active IP Right Grant
  • 2007-12-20 DK DK07871988.7T patent/DK2134480T3/da active
  • 2007-12-20 ES ES07871988T patent/ES2410087T3/es active Active
  • 2007-12-20 PL PL07871988T patent/PL2134480T3/pl unknown

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