Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
  • B21B45/0269—Cleaning
  • B21B45/0275—Cleaning devices
  • B21B45/0278—Cleaning devices removing liquids
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
  • B21B45/0269—Cleaning
  • B21B45/0275—Cleaning devices
  • B21B45/0278—Cleaning devices removing liquids
  • B21B45/0281—Cleaning devices removing liquids removing coolants
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
  • B21B45/0269—Cleaning
  • B21B45/0275—Cleaning devices
  • B21B45/0278—Cleaning devices removing liquids
  • B21B45/0284—Cleaning devices removing liquids removing lubricants
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
  • B21B27/06—Lubricating, cooling or heating rolls
  • B21B27/10—Lubricating, cooling or heating rolls externally
  • B21B2027/103—Lubricating, cooling or heating rolls externally cooling externally
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
  • B21B45/0269—Cleaning
  • B21B45/029—Liquid recovering devices

Definitions

• the present invention relates to a wiper or scraper and generally to a device for removing a liquid from the surface of a roller or a strip, without mechanical contact with the roller or the strip, for a use in the field of hot or cold rolling of metallurgical products, such as steel strips, without the invention being limited to such products or uses.
• the invention also relates to an industrial installation such as a rolling mill comprising a moving metal strip and / or at least one working cylinder and a contactless wiping system as defined above.
• Figure 1 shows schematically the combination of lubrication and water-oil emulsion cooling in a cold rolling mill cage according to the state of the art, both input and output of the cage.
• WO 2008/149195 A1 discloses a rolling mill for metal products comprising at least one pair of working rollers and at least one cooling device projecting a plurality of pressurized cooling jets on at least one working roller, the cooling device also comprising at least one scraping jet between the cooling jets and the metal product to be rolled, the scraping jet being oriented in the desired flow direction at a reentrant angle perpendicular to the surface of the working roller .
• the document also discloses a rolling method using said rolling mill.
• US 5,737,796 A discloses a wiper system for removing liquids such as lubricants and coolants from the surface of a metal strip.
• the system includes upper and lower wiper rollers for wiping the top and bottom surfaces of the web, respectively.
• the wiper rolls each comprise a metal core and a porous resilient coating.
• the wiper system comprises at least one upper backing roll for said upper wiper roll and at least one lower backing roll for said lower wiper roll providing support for said wiper rolls, for pressing said wiping rollers against respective adjacent band surfaces, resulting in formation of a liquid bead on each surface of said band at the input end of the nip of the wiping roll, to engage the rolls of respective wiping in the contact areas at the inlet ends of which are formed the oil beads pressed by said porous roller coatings.
• a suction assembly is provided to remove the liquid from each bead.
• US 5,046,347 relates to a refrigerant containment apparatus for rolling mills in which an aqueous coolant is vaporized on the surfaces of the upper and lower working rolls by respective top and bottom spray heads, only on the the outlet of the rolling mill and which comprises an enclosure maintained at a pressure below atmospheric pressure and surrounding the upper vaporization head and the surfaces of the adjacent upper working cylinder and support cylinder, upper air holding members and lower part extending along the edges of the enclosure above and below the vaporization head so as to define narrow free air spaces on the surfaces of the cylinders, pads connected to the ends of the retaining elements and rubbing on the cylinders so as to maintain constant the width of the free spaces, as well as seals mounted on the roll supports at the ends of the rolling mill and cooperating with the enclosure in order to seal the interior of the enclosure.
• a trotter removes the coolant from the upper work roll on the mill entry side, while manifolds capture and remove the vaporized refrigerant through the ends of the roll nip on the output side of the rolling mill. Air is blown into the outlet side of the cylinders to move the coolant from the surface of an outgoing laminate metal strip into the manifolds. Below the rolling line, a shield protects the laminated metal strip from the refrigerant exiting the lower vaporization head.
• JP H0241710 A discloses a non-contact device to ensure a good seal with respect to the coolant on the surface of a rolling mill roll.
• Hydraulic cylinders are mounted on a guard and sealing material is attached to a piston of the cylinders.
• the gap between the peripheral surface of a rolling roller and the end of the sealing material is measured by a sensor.
• the end of the sealing material is positioned by actuating the rolls with a directional control valve so as to adjust said gap in the right sealing zone. The seal is thus made without contact between the sealing material and the peripheral surface of the roll.
• the present invention aims to provide a contactless wiping solution in hot or cold rolling mills that allows to overcome the disadvantages of the prior art.
• the invention aims to control the cooling process in the hot or cold rolling mill without harmful interaction with the lubrication process.
• the invention also aims to increase the early cooling efficiency. Summary of the invention
• a first aspect of the present invention relates to an industrial plant comprising a moving metal strip and / or at least one working cylinder and a non-contact wiping system of a jet or liquid stream of cooling and / or lubricant entrained by the surface of said moving metal strip or said working cylinder, said wiper system comprising a separation tab with an integrated cooling liquid supply terminated by a nozzle ramp intended to be placed along the width of the metal strip or the cylinder and separated, in use, by a predetermined interval with respect to the metal strip or the working roll, the nozzle ramp being oriented so as to providing a jet in the form of a curtain of liquid directed in a direction substantially opposite to the direction of travel of the strip or rotation of the cylinder and a liquid recovery channel, so that in use, the liquid sprayed by the sprinklers deflects the jet or stream of liquid and / or lubricant entrained by the belt or cylinder to form a combined flow of liquid or liquid and lubricant mixture that deviates from the belt or roller to fall
• the industrial installation with wiper system comprises at least one of the following characteristics, or an appropriate combination of several of them:
• the wiper system is designed to redirect most (i.e. at least 90%) of the liquid or lubricant entrained by the belt or cylinder to the recovery gutter, when the liquid and / or lubricant residual is deflected by the liquid sprayed by the sprinklers;
• the nozzles have an outlet orifice having a diameter of between 1 and 5 mm;
• the nozzles are oriented in such a way as to project a liquid on the surface of the strip or working roll in a direction forming an angle with said surface between 0 ° and 45 °;
• the flow rate of said liquid sprayed by the jets is between 10 and 150 m 3 / h.
• Another aspect of the present invention relates to a rolling mill stand for metal strips comprising at least one pair of work rolls and at least one cooling device projecting a plurality of pressurized jets on at least one of said rolls through a plurality of nozzles constituting a cooling ramp and a wiper system as described above, characterized in that the wiper system is proximal to the grip of the work rolls and in that the cooling ramp is distal to said right-of-way.
• the wiper system is located under the dimension of the axis of the working cylinder. Still advantageously, in the aforementioned rolling mill for metal strips, the wiper system is located at the same level as the dimension of the axis of the working roll.
• Yet another aspect of the invention relates to a use of the wiper system described above, characterized in that the liquid sprayed by the sprinklers of the wiper system is water or a water-oil emulsion .
• Yet another aspect of the invention relates to a use of the wiper system described above, at least partially, for the application of a cooling, preferably a highly turbulent early cooling.
• Yet another aspect of the invention relates to a use of the wiper system described above, either as inlet wiper, to avoid a return flow of the inlet coolant, or as an output wiper , to prevent the coolant from drip downstream on the surface of the strip.
• Yet another aspect of the invention relates to a use of the wiper system described above, in a hot strip mill, as an inlet wiper.
• Yet another aspect of the invention relates to a use of the wiper system described above, for the removal of water from a strip surface in horizontal or vertical displacement in a hot strip mill or cold, for tape drying for measuring purposes, application of lubricant or cooling.
• Figure 1 shows schematically the state of the art in cooling and lubrication in a cold rolling mill cage.
• Figure 2 schematically shows a first embodiment of the wiper system according to the present invention, for use in the case of a working cylinder.
• Figure 3 schematically shows a second embodiment of the scraper system according to the present invention, for use in the case of a metal strip as a rolled product.
• Figures 4A and 4B respectively show two methods of implementation of a wiper installation according to the present invention in the case of cooling and lubrication in a cold rolling cage of a metal strip.
• Figure 5 shows a method of implementation of a scraping installation according to the present invention in the case of cooling and lubrication in a hot rolling mill of a metal strip.
• FIG. 6 shows an exemplary flow / pressure relationship in the case of a scraping installation according to the present invention.
• Figure 7 shows the variation of flow / pressure in the case of a scraping installation according to the present invention, for different sizes of nozzles.
• FIG. 1 A first embodiment of the wiping system or scraping according to the invention, applicable to a working roller, is shown in Figure 2.
• the body of the wiper 7 provides the coolant supply and is terminated by a ramp 2 preferably covering the entire width of the cylinder or the working roll 3 and provided with a row of removable nozzles (no shown).
• the wiper 1 with its nozzle ramp 2 is separated from the working cylinder 3 by a distance or a gap 6.
• the aforementioned nozzles are directed to produce a jet of coolant 4, in practice water or water-oil emulsion, which opposes the jet or stream of water or emulsion 4 'applied to the cylinder as part of the conventional cooling process thereof and which is driven by this one.
• the collision of the two opposite jets 4, 4 ' causes a common deflection of all the two jets radially outwardly of the cylinder 3.
• the deviated common jet 4 "is then collected by a gutter 5.
• FIG. 3 A second embodiment of the wiper system according to the invention, applicable to a metal strip, is shown in Figure 3.
• the device is identical to that of Figure 2, except for the presence a flat metal strip 15 in place of the convex surface of the working cylinder 3 above.
• FIG. 6 shows a flow / pressure curve for a wiper 1.3 m in length with nozzle orifices 2.5 mm in diameter.
• Figure 7 also shows the calculated flow / pressure curve (nozzle orifice of about 2 mm and 3 mm in diameter respectively) and measured (2 mm orifice). At a distance of 5 mm from the roller, the 2 mm nozzles provide a 90% seal and the 3 mm nozzles provide an almost perfect seal of 95-99%. In this case, the jet boom is 1.8 meters long.
• an additional advantage of the water wiper according to the invention is that it allows to implement an early and highly turbulent cooling instead of a water bath stationary corresponding to a conventional cooling of work rolls.
• Early cooling is a cooling that is generally performed between the finishing train and the laminar cooling. It can also be made between the roughing train and the finishing train.
• the water scraper can replace or be combined with known conventional scrapers in the hot rolling mill.
• conventional scrapers come into contact with the work rolls, they wear out or burn over time, and coolant leaks may occur at this point. This can result in inhomogeneities of the strip itself or temperature and disruption of lubricant application.
• the drain gutter is essential and essential to the invention.
• a limited flow rate of approximately 30 m 3 / h is necessary for the proper functioning of the device according to the invention (at low pressures and low flow rates) for a nozzle orifice of 2.5 mm. Above 2.5 mm, it is necessary to increase the flow of water; the device according to the invention is probably adaptable to more conventional industrial roller cooling configurations (eg with dynamic roll). Description of preferred embodiments of the invention
• the equipment according to the invention can advantageously be used in the following cases.
• the invention applies to the cooling of working rolls in a cold strip mill: - either as inlet scraper 1 (see FIG. 4A), which allows avoid the return flow of the inlet cooling 1 1 which notoriously disturbs the lubrication of the band 13 upstream;
• the invention applies to the cooling of working rolls in the hot strip mill, as input scraper 1 (see Figure 5).
• Today it is impossible to use inlet cooling with effective right-of-way lubrication.
• a scraper according to the invention an effective and maintenance-free sealing can be achieved in such a way that effective lubrication of the right-of-way can be achieved.
• the scraper does not come into contact with the working roller, there will be no wear of the latter.
• the invention is applicable to the removal of water from a horizontal or vertical strip surface in the strip mill hot or cold.
• the intended purposes in this case are, for example, strip drying for measuring purposes, application of lubricant or cooling.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Metal Rolling (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=59982202

Family Applications (1)

Country Status (6)

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• 2017
  • 2017-09-04 BE BE2017/5614A patent/BE1025125B1/fr not_active IP Right Cessation
• 2018
  • 2018-08-29 WO PCT/EP2018/073263 patent/WO2019043073A1/fr not_active Ceased
  • 2018-08-29 EP EP18759328.0A patent/EP3678794B1/de active Active
  • 2018-08-29 US US16/643,609 patent/US11331705B2/en active Active
  • 2018-08-29 ES ES18759328T patent/ES2899244T3/es active Active
  • 2018-08-29 CA CA3074862A patent/CA3074862A1/en active Pending

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