Classifications

• • 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
  • 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
  • B21B45/0203—Cooling
  • B21B45/0209—Cooling devices, e.g. using gaseous coolants
  • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
  • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
• • 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
  • B21B45/0203—Cooling
  • B21B45/0209—Cooling devices, e.g. using gaseous coolants
  • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
  • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
• • 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
  • B21B45/0239—Lubricating
  • B21B45/0245—Lubricating devices
  • B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
  • B21B45/0251—Lubricating devices using liquid lubricants, e.g. for sections, for tubes for strips, sheets, or plates

Definitions

• the invention relates to a method for cooling and / or lubricating rolls, in particular work rolls of a roll stand and a rolled strip conveyed between them during rolling.
• vibrations of the work rolls i.e. torsional vibrations of the two work rolls occur against each other.
• document DE 41 34 599 C1 shows a measure against the high thermal load in the roll gap by subcooling the strip surface and roll surface shortly before the roll gap. This results in a lower heat flow into the roller when the surface layers of the rollers and the rolled strip are supercooled.
• a relatively large amount of water is required, although the effect is not sufficient with large reductions in thickness.
• One method of application which has also become established, is still to spray the rolls with an oil / water mixture in front of the roll gap.
• a small amount of water serves as a carrier medium for the oil.
• the addition of lubricant is intended to reduce the coefficient of friction and in some cases to create a thin oil separating layer that protects the roller against wear.
• Another area of technology is for the lubrication and cooling of workpieces in machining processes according to the document It is known from EP 0 69 07 66 to supply the workpieces with at least two immiscible fluids, namely a substrate for reducing the friction between the cutting edge and the workpiece, and a substrate for cooling the cutting edge and the workpiece, the two substrates being stored separately from one another via separate feed lines conveyed to an application organ and sprayed from it onto the workpiece to be machined.
• the description states that the method and the device achieve a substantial increase in the lubricating and cooling effect and that the means and expenditure required for this in terms of material, energy and equipment are kept within the narrowest possible economic limits.
• a largely similar method for the lubrication and cooling of cutting edges or workpieces is also known from DE 43 09 134 A1, according to which when the cutting edge and workpiece move relative to the machining area, first the lubricant and only then the coolant in accordance with the required cooling of Workpiece and tool is sprayed on. For this purpose, the temperature of a cutting edge or a tool or a workpiece is determined and the feed rate of one of the two fluids is set in accordance with the determined temperature.
• the object of the present invention is to provide the roll cooling and roll lubrication to improve a heavily loaded roll stand and to use lubricants more economically.
• the invention provides for the use of water in the form of spray jets as a coolant in a method of the type mentioned in the preamble of claim 1 for cooling and lubricating rolls, in particular the work rolls of a roll stand and a rolled strip conveyed between them during rolling.
• water, oil-air mixture, oil-water mixture or oil-water-air mixture as a lubricant
• the media - water or lubricant - being fed separately to the rollers or the rolling belt and being scrapped at different application points.
• side of the roller surface or the surface of the rolled strip are applied. Fat or a mixture of fat and medium can be used instead of oil.
• the lubricant is applied in the form of an oil, oil-air mixture or oil-water mixture, or oil-water-air mixture in order to achieve the most adhesive film possible on largely water-free areas of the roller surface.
• This ensures a good spreading of the oil film on the roller surface, so that the oil film adheres well and cannot be easily washed off by spray water later on and maintains its full lubricating effect.
• the same effects are also achieved when using grease as a lubricant component for a grease-medium mixture.
• the application areas for applying the cooling medium and the lubricant be separated from one another by means of wipers.
• the so-called wipers which are present anyway, are used to separate the application sites for water and lubricant in the simplest way.
• the cooling water of the work roll cooling on the outlet side is shielded by the backup roll.
• water jets are applied on the inlet side in front of the roll gap on the upper and / or lower side of the strip, the water jets preferably being directed against the strip, and that lubricant is applied to an area at the top and bottom the rollers - seen in the direction of rotation - takes place on the inlet side in front of the areas of water application.
• the water jets there is therefore a direct application of water in front of the roll gap on the upper and / or lower side of the strip, the water jets being primarily aimed at the strip in order not to wash away the previously applied lubricating oil. Nevertheless, the orientation of the water jets indirectly results in additional cooling of the roller surface.
• the inlet-side roller cooling is deactivated in the case of active lubrication, the excess water from the inlet side being used to intensify the outlet-side roller cooling.
• the further intensive cooling of the rollers on the outlet side takes place exclusively with water spray. If the lubrication is not active, the roller cooling is activated on the inlet side.
• a device for cooling and / or lubricating rolls according to the invention in particular the work rolls of a roll stand and a rolled strip rolled and conveyed between them, using water in the form of spray jets as the cooling medium and a lubricant, provides that the media - water and lubricant - in each case separate storage containers and separate feeds to pressurizing elements for water and to pressurizing elements for lubricants are assigned.
• the arrangement of a lubricant spraying device is provided on the upper roller above a scraper and on the lower roller below a scraper, which is more advantageous Way can be used on the wipers already present in roll stands.
• a deflection plate or water spreading plate directed against the rolled strip or water spreading plate for the spray jets can be used below the upper inlet-side scraper and above the lower inlet-side scraper in order to distribute the spray water on the rolled belt as evenly as possible and without streaking.
• This can be a sheet on each side, but also two baffles that focus the water jet in a funnel shape in order to achieve the best possible uniformity of the coolant jet across the width of the rolling surface.
• a so-called water curtain can be used for cooling the tape, for example according to DE patent 28 04 982, the water emerging from a rectangular slot and being sprayed against the tape.
• an optimization of the water curtain provides that the opening width of the outlet slot is adjustable in order to accommodate e.g. B. to realize cleaning purposes or variable amounts of water as favorable conditions as possible.
• Figure 1 shows a side view of the roll cooling and roll lubrication device with schematically indicated spray jets of water and lubricant.
• Figure 2 shows a further arrangement of nozzles for strip cooling immediately before the roll gap when using a water curtain.
• Figure 3 shows an alternative arrangement of baffles and shielding shells for separate removal of the lubricant.
• a roll strip 1 between the work rolls 2, 3 of a roll stand (not shown in detail) is reduced in thickness by approximately 50% in a single pass.
• the following stands also not shown in more detail, have approximately the same large stitch decreases.
• a combined use of cooling of the strip and lubrication of the roll surface is carried out with the following measures.
• the media - water or lubricant - are separate storage containers (not shown in each case) and separate feeds to the pressurizing elements 11, 11 '; 11 "for water 4.5 and assigned to the separate application members 12, 12 'for lubricants 10, 10'.
• these application members are designed as lubrication and cooling bars.
• the arrangement of the lubricant bars 12 on the upper work roll 3 is above a scraper 9.
• the arrangement of the lubricant bar 12 ' is provided on the lower work roll 2 below the scraper 8.
• the upper water cooling bar 11 for cooling the upper side of the strip 1 is below the scraper 9 and the lower water cooling bar 11 for cooling the lower side of the rolled strip 1 is arranged above the scraper 8.
• water spray jets 4, 5 are directed onto the roll strip surfaces in front of the roll gap of the work rolls 2, 3.
• the water spray jets 4, 5 are deflected so that they are possible ht directly in the inlet-side area of the roll gap and there in the application areas 7, 7 'for immediate cooling of the roll des 1 and for indirect cooling of the work rolls 2, 3 achieve the optimal effect.
• FIG. 3 An alternative arrangement of the deflection plates can also be seen in FIG. 3.
• a water jet is focused in a funnel shape by means of two baffle plates in order to achieve the best possible uniformity of the jet across the roll width.
• the lubrication bars 12, 12 ' are provided for generating lubricant spray jets 10, 10'.
• the lubricant is applied to the largely water-free area of the roll surface of the work rolls to achieve the most adhesive film possible.
• the spray oil 10, 10 '- seen in the direction of the rotation of the rollers - is applied at a point close to the wipers 8, 9.
• the lubrication and cooling beams 11, 12 can be controlled so that the inlet-side water cooling 11 "is deactivated in the case of active lubrication and the roller cooling 11" is activated when the lubrication is not active. If the roller cooling 11 "on the inlet side is deactivated, excess water is fed from there to intensify the roller cooling on the outlet side, that is to say the cooling bars 11 'arranged there. It is also possible to switch from the combined roller cooling and roller lubrication with separate loading locations to one exclusive water cooling, with all the water cooling bars 11, 11 '; 11 "shown being activated and the lubricating bars 12 being deactivated as a whole.
• FIG. 2 A further embodiment of the arrangement is shown in FIG. 2 for strip cooling immediately before the roll gap. Here water 4, 5 emerges from a rectangular slot and is sprayed against the belt 1. With an eccentric adjustment 19, which can be operated manually or by a motor, the slot or opening width can be continuously adjusted by rotating the shaft.
• An embodiment of the lubricant supply according to FIG. 3 further provides that lubricant 10, 10 'sprayed onto the work roll is passed past and returned to the roll within a shielding shell 16, 16'.
• the pivotable shielding shell shows a feed line 17, 17 'for the lubricant 10, 10' and a discharge line 18, 18 '.
• the lubricant can also be drained off to the side and then collected. This means that the lubricant can be processed or disposed of if necessary. This prevents it from accumulating in the cooling circuit.
• the arrangement of lubricating and cooling bars for lubricants and water spray jets shown in FIGS. 1 to 3 and the method for cooling and lubricating the work rolls of a rolling stand realized with the new arrangement is not only limited to the exemplary embodiment shown, but also includes other variants if they satisfy the invention.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Metal Rolling (AREA)
• Lubricants (AREA)
• Heat Treatment Of Articles (AREA)
• Heat Treatments In General, Especially Conveying And Cooling (AREA)
• Lubrication Of Internal Combustion Engines (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7689892

Family Applications (1)

Country Status (18)

Cited By (4)

Families Citing this family (63)

Family Cites Families (15)

• 2001
  • 2001-06-28 DE DE10131369A patent/DE10131369A1/de not_active Withdrawn
• 2002
  • 2002-06-25 ES ES02754755T patent/ES2247363T3/es not_active Expired - Lifetime
  • 2002-06-25 DE DE50203972T patent/DE50203972D1/de not_active Expired - Lifetime
  • 2002-06-25 WO PCT/EP2002/007030 patent/WO2003002277A1/fr not_active Ceased
  • 2002-06-25 CA CA2452057A patent/CA2452057C/fr not_active Expired - Fee Related
  • 2002-06-25 KR KR1020037015807A patent/KR100861247B1/ko not_active Expired - Fee Related
  • 2002-06-25 AU AU2002321114A patent/AU2002321114B2/en not_active Ceased
  • 2002-06-25 MX MXPA03011355A patent/MXPA03011355A/es active IP Right Grant
  • 2002-06-25 AT AT02754755T patent/ATE302072T1/de active
  • 2002-06-25 BR BRPI0209701-0A patent/BR0209701B1/pt not_active IP Right Cessation
  • 2002-06-25 EP EP02754755A patent/EP1399277B1/fr not_active Expired - Lifetime
  • 2002-06-25 CZ CZ20033076A patent/CZ20033076A3/cs unknown
  • 2002-06-25 US US10/481,927 patent/US7159433B2/en not_active Expired - Lifetime
  • 2002-06-25 RU RU2004102200/02A patent/RU2287386C2/ru active
  • 2002-06-25 UA UA2004010600A patent/UA79935C2/uk unknown
  • 2002-06-25 CN CNB028131576A patent/CN1240494C/zh not_active Expired - Fee Related
  • 2002-06-25 JP JP2003508499A patent/JP4234003B2/ja not_active Expired - Fee Related
  • 2002-06-26 TW TW091113984A patent/TWI259111B/zh not_active IP Right Cessation
• 2003
  • 2003-11-04 ZA ZA200308587A patent/ZA200308587B/xx unknown

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