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
  • 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
  • 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
  • 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
• • 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 invention relates to a cleaning device and a method for removing a lubricant from the rolls of a roll stand.
• Roll stands especially in hot strip mills, typically include nip lubrication equipment, usually mounted to the upstream side of the mill in the area of the work roll.
• a lubricant is applied to the Ar ⁇ beitswalze, wherein as lubricant usually a water-oil emulsion is sprayed.
• the lubricant redu ⁇ decorates the coefficient of friction between each roll and the rolling significantly. This reduces the rolling forces and the surface quality of the rolling stock is improved. As a result, few rolling steps are required and / or the profile and the flatness of the rolling stock can be better influenced by a greater degree of freedom in the rolling force. In addition, energy consumption is reduced and the production spectrum increased. Before the tapping of the rolling stock, which for example a
• the rollers in particular the Häwal ⁇ zen must, however, be free of lubricant to increase of friction ⁇ coefficient of the roll, otherwise there is a risk that the rolling stock is not fed into the rolling stand, which of an interruption Rolling process leads. For this reason, the roll gap lubrication is switched off just before unloading the rolling stock, thereby burns the lubricant due to the high belt temperature completely in the remaining Walzenumcollectn. Only after renewed threading of the next rolling stock, the roll gap lubrication is switched on again. The head and foot of the rolling stock are rolled without lubrication. This, however, adversely affects the Rolling, since the foot of the rolling stock, which is usually the coldest, requires the highest rolling force.
• a method for cleaning a metal strip is also known, in which the metal strip is subjected to ultrasonic cleaning, in which the metal strip is passed through a container filled with a liquid.
• the invention has for its object to increase the efficiency in the cleaning of the rolls of the mill stand, without increasing the water consumption for cooling the rollers during operation of a roll stand substantially.
• the object is solved by a cleaning ⁇ constriction device of a lubricant from the rollers of a rolling mill for removing, wherein the cleaning device comprises at least one ultrasonic generator for generating ultrasonic waves, the ultrasonic waves by means of cleaning water to the surface of the rollers be conducted, wherein the cleaning device comprises a
• the supply line for the cleaning water comprises, wherein the supply line is a branch of a cooling water circuit for the rolling stand.
• the object is also achieved according to the invention by a Ver ⁇ drive for removing a lubricant from the rolls of a rolling stand, wherein the cleaning water to the surface of the rolls and is conveyed by means of the ultrasonic cleaning water waves are directed to the surface of the rollers, wherein the cleaning water is diverted from a cooling water circuit for the rolling stand.
• the invention is based on the finding that the pressure of the cleaning liquid can be reduced, but still there is an intensive surface cleaning with a high efficiency by the cleaning is supplemented by ultrasonic waves, which propagate with the cleaning liquid to the surface of the roller and increase the cleaning effect .
• Ultrasound is known to work even in small wells of the surface and mechanically bring adhering particles or substances into solution. Thanks to the ultrasonic waves, the risk of damage to the surface of the roller is minimized.
• notches on the surface of the roller, such as fire cracks can be cleaned efficiently.
• the cleaning liquid is applied in particular to the roll surface at a pressure of 5 to 15 bar, wherein the pressure is about ten times lower than the required pressure according to JP 2002-178011-A.
• the at least one ultrasonic generator is integrated in particular in the cleaning ⁇ device, and type of the cleaning liquid to ⁇ so that the ultrasonic waves are supplied directly to the cleaning liquid and with this fürge ⁇ passes.
• the result is a fluid bridge between the ultrasonic generator and the roller surface, which transmits the sound waves.
• This type of cleaning can be applied to both the work rolls and the back-up rolls of a rolling stand.
• water is as a cleaning agent USAGE ⁇ det. Since water is chemically neutral, the use of water is gentle on the rollers. In addition, water is anyway a wide application in the rolling process, so that in a rolling mill large amounts of water are available.
• the main advantage of such a cleaning is that the lubrication can be used for the whole band foot and for the essential part of the band head. This reduces the rolling force, resulting in a significant energy saving effect.
• the product range is broadened: with an identical design of the system (drives, hydraulics and stands), harder steel products can be rolled.
• a particularly good synergistic effect, which increases the efficiency of the cleaning, is achieved by the cleaning water is diverted from the cooling water circuit for the mill, wherein the water is supplied via a supply line of the cleaning device and this supply line is a Abzwei ⁇ tion of the cooling water circuit for the roller.
• the water consumption for the roll stand can be kept constant, it is merely a redistribution of the water by a part of the
• Cooling water is supplied to the cleaning device. This has the advantage that the rolling temperature rises slightly to ⁇ so that the cleaning performance is supported by the higher Wal ⁇ zentemperatur at which the lubricant better detached from the roll surface.
• At least two ultrasonic generators of different frequency are provided, e.g. an ultrasonic generator with 40 kHz and an ultrasonic generator with 80 kHz frequency.
• a sealing element which faces a nip between the rollers is, so that the sealing element seals the roller against a forth ⁇ outflowing liquid in the direction of rotation of the roller.
• an opening facing the nip ⁇ is provided on the cleaning device, through which the cleaning water is conveyed to the surface of the roller.
• the cleaning device is arranged at least on the inlet side of the respective roller.
• cleaning devices can also be provided on the outlet side. Since the cleaning device is characterized by a manageable number of additional components, it requires a small installation space and can be easily installed in a protected installation position in existing components of the mill stand.
• the cleaning device is integrated in particular in a chock of the work rolls or in a chilled beam for the rolling stand.
• at least one cleaning device arranged on the inlet side is provided per roll; in the case of reversibly operated rolling stands, two cleaning devices per roll make sense - one inlet and one outlet side.
• the cleaning water contains an emulsifier.
• the cleaning performance is increased, since lubricant particles which are thrown up during the cleaning process do not settle again so easily on the roll surface can.
• the same emulsifier is used, which is admixed with the lubricant. In this way, it is ensured that no additional resources must be made available, but the cleaning of the roll surface is carried out only with the help of Tromit ⁇ stuffs, which are anyway required and approved for the operation of the mill stand.
• the temperature of the cleaning water is between 0 ° C and 70 ° C.
• the temperature of the cleaning water corresponds to an ambient temperature, so that no additional heating effort for the makeswas ⁇ water is required, or such a heating effort is limited.
• the Rei ⁇ n Trentsvoriques is preferably only between a tapping of a preceding material to be rolled by the rolling mill and a ⁇ An engraving of a subsequent material to be rolled running.
• a tapping of a preceding material to be rolled by the rolling mill and a ⁇ An engraving of a subsequent material to be rolled running.
• the cleaning process ⁇ supply is interrupted and resumed normal operation of the rolling stand.
• FIG. 2 shows a cross section through a cleaning device for an upper work roll of the roll stand according to FIG. 1
• FIG. 3 shows a longitudinal section through the cleaning device according to FIG. 2
• FIG. 2 shows a cross section through a cleaning device for an upper work roll of the roll stand according to FIG. 1
• FIG. 3 shows a longitudinal section through the cleaning device according to FIG. 2
• FIG. 2 shows a cross section through a cleaning device for an upper work roll of the roll stand according to FIG. 1
• FIG. 3 shows a longitudinal section through the cleaning device according to FIG. 2
• FIG. 4 shows a coolant circuit and a lubricant circuit of a roller.
• a rolling stand 2 which comprises two working ⁇ rollers 4 and two support rollers 6. Between the work rolls, a roll gap 8 is formed, through which rolled goods, run in the embodiment shown rolling belts.
• a preceding, already rolled rolled strip 10 is shown with a reduced thickness, the foot part is still in the nip 8, and a subsequent, prepared for rolling rolled strip 12th
• a lubricant is supplied to the work rolls 4 through lubricant nozzles 14.
• the nip 8 Before tapping the subsequent rolled strip 12, however, the nip 8 must be lubricant-free, so that the rolling ⁇ band 12 can be easily fed into the rolling stand 2.
• each is provided a watersvor ⁇ device 16 for each drive roller 4 with the aid of a watersflüs ⁇ stechnik, in the embodiment shown, water is applied to the surfaces of the working rolls. 4 The cleaning water is only applied to a part of the surface.
• the effective range of the cleaning water shifts around the circumference of the respective work roll 4, so that ultimately the entire surface area of the work rolls 4 is exposed to the cleaning water.
• an ultrasonic generator 18 is integrated, are generated with the aid of ultra ⁇ sound waves, which are passed by means of water from the cleaning device 16 to the surface of the work rolls.
• the respective cleaning device 16 is in the embodiment 16 shown installed in the cooling circuit of Ar ⁇ beitswalzen 4 and attached to a einlaufseifigen fender 20.
• the function of the mudguard 20 is to prevent cooling water from reaching the rolled strip 10, 12.
• the coolant circuit has per work roll on the inlet and outlet side a coolant supply 22, which opens into a chilled beam 24, which extends substantially over the length of the work rolls perpendicular to the plane of the drawing. From the coolant supply 22, a feed line 26 is also branched off on the inlet side, through which water is introduced into the cleaning device 16.
• the construction of the cleaning device 16 can be seen in FIGS. 2 and 3.
• the cleaning device 16 has a
• Cavity 28 which is filled in operation with water.
• the ultrasonic generator 18 is arranged, so that the ultrasonic generator 18 is in particular continuously washed by the water during operation, which is conveyed in the direction of the roll zen surface.
• a sealing element 32 At a side facing the nip 8 side 30 of the cleaning device 16 is a sealing element 32, which is in the manner of a sealing lip ⁇ forms, arranged. In particular, by its contact with the roll surface, the sealing element prevents water from the cleaning device 16 during the rotational movement of the work roll 4 down to the rolled strip 10, 12, flows.
• an opening 36 is formed through which the water is passed from the cleaning device 16 in the opposite direction to the direction of rotation of the work roll 4 to the roll surface.
• the lower roller 4 shows the opening 36 downwards, so as to ⁇ additionally affects the force of gravity and increases the discharge of the cleaning water supply ⁇ .
• openings 36 facing away from the roll gap 8 openings which are not shown here in detail can also be provided in the region of the front sides of the work rolls 4. In this case, the side The drain of the cleaning water, for example, is collected via lines or baffles and can be recirculated.
• baffles 38 are optionally provided in the cleaning device 16, which effect a uniform flow through the cavity 38, so that the formation of dead zones in the cavity 28 is suppressed.
• the water transmits the sound waves from the ultrasonic generator 18 to the rolling surface and thus forms a kind of flues ⁇ stechniks Hampshire between the ultrasonic generator 18 and the work roll 4.
• the lubricant on the roll surface is sputtered and removed from the water via the ultrasonic waves in the water.
• the water is conveyed with a pressure of about 10 bar to the working ⁇ roller 4 and in particular has a temperature that corresponds to the resultant of the process control and / or the tool state temperature.
• Reference numeral 40 denotes a lubricant tank in FIG. 4 and an emulsifier tank 42.
• the lubricant, the emulsifier and water from a water supply line 48 for scaffolding cooling are brought together in a mixer 44 and via a lubricant line 46 of the lubricant nozzle 14, which is arranged in theforementionedsbei ⁇ game below the mudguard 20 in the vicinity of the rolling gap ⁇ 8 in the shownsupplementarysbei ⁇ , fed.
• Cooling water is introduced from the water supply line 48 into the cooling water line 22, which is sprayed onto the surface of the work roll 4 via the cooling bars 24.
• a portion of the cooling water is umgelei ⁇ tet via the supply line 26 before it has reached the chilled beam 24.
• the cooling water Ström is in a ratio to the cleaning stream between 10: 1 to 2: 1.
• the portion of water in the Zubuchlei ⁇ tung 26 is mixed in a second mixer 50 with the emulsifier from the Emulgatortank 42 and then introduced into the cleaning device sixteenth
• an emulsifier line 52 leads directly from the emulsifier tank 42 to the second mixer 50, which likewise is arranged on the protective plate 20 like the cleaning device 16.
• the emulsifier increases the efficiency of the cleaning water.
• the supply line 26 also opens into the second mixer 50.
• the cooling water and the cleaning water, which runs off the side of the work rolls 4, is finally collected in a cooling water sump 54 and discharged from the rolling stand 2 for processing.
• the Wasserzunet ⁇ tion can be controlled in the lines 22 and 26 in dependence on the Walzvor- gear effort and in a short time by means of the valves 56a and 56b.
• the water supply to the cleaning device 16 is interrupted during the rolling of the preceding roll ⁇ belt 10, so that the total amount of water used in thedewas ⁇ water pipe 22 for cooling purposes.
• the cleaning device 16 is only briefly turned on between a tapping of the preceding rolled strip 10 and a tapping of nachfol ⁇ constricting rolled strip 12th
• part of the water in the cooling water line 22 is diverted into the supply line 26 and finally reaches the cleaning device 16.
• the cleaning device 16 is active, at least from the inlet-soapydebal ⁇ ken 24 less water to the roll surface.
• this has the positive side effect that the lubricant is easier to solve by heating the roll surface.
• the roll stand 2 is thus characterized not only by an efficient operation thanks to the increase in the coefficient of friction during the start of the rolling belts 10, 12, but also by a minimized energy requirement and by a potentially constant water requirement.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Cleaning By Liquid Or Steam (AREA)
• Metal Rolling (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

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ID=47469942

Family Applications (1)

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Cited By (1)

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Citations (5)

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• 2012
  • 2012-02-01 EP EP12153475.4A patent/EP2623223A1/de not_active Withdrawn
  • 2012-12-12 BR BR112014019035A patent/BR112014019035A8/pt not_active IP Right Cessation
  • 2012-12-12 WO PCT/EP2012/075215 patent/WO2013113441A1/de active Application Filing
  • 2012-12-12 US US14/376,281 patent/US20150020845A1/en not_active Abandoned
  • 2012-12-12 CN CN201280068760.5A patent/CN104080552B/zh not_active Expired - Fee Related
  • 2012-12-12 EP EP12808763.2A patent/EP2794137B1/de not_active Not-in-force

Patent Citations (5)

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