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
  • 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
  • B21B1/22—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 plates, strips, bands or sheets of indefinite length
  • B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
  • B21B1/26—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
• • 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
• • 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
• • 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
  • B21B1/46—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 metal immediately subsequent to continuous casting

Definitions

• the invention relates to a method for rolling rolled material, in particular for hot wide strip rolling in a finishing train or a casting and rolling plant, in which a lubricant is applied directly to the surface of the work rolls or indirectly to the surface of the support rolls with transfer to the surface of the work rolls before the rolling stock runs into the roll gap of a roll stand, a strongly adhering lubricating film being formed on the work roll surface, which leads to a reduction in the friction in the roll gap as an intermediate layer between the roll and the rolling stock.
• a device for automatic oil supply to a hot rolling mill stand through which a workpiece passes.
• the device comprises an oil spray device for the roll stand, means for supplying oil to the spray device, means for initiating the operation of the oil supply means shortly after the front end of the workpiece passes through the roll stand, and means for ending the operation of the oil supply means just before the rear end of the workpiece reaches the roll stand.
• DE 20 22 923 discloses a method and a device for applying a lubricant to a workpiece in a hot strip rolling mill, lubricant and atomizing air being dispensed at several spray nozzles in a four-roll stand provided with two work rolls and two backup rolls.
• the spray nozzles are arranged across the width of at least one of these support rollers.
• the starting point for lubricant delivery is the tapping in the frame in question.
• a disadvantage of this method or device is that a closed lubricant film must first form on the backing roll surface, which is transferred to the backing roll / work roll gap on the work roll surface. From here, the lubricant gets into the roll gap. It takes too much time (several seconds) for the lubricant to reach the rolling stock, depending on the circumferential speed of the roll and the roll diameter. In such a method or in such a device, the strip head is not supplied with fresh lubricant during threading, which leads to higher rolling forces for a short time.
• the gripping condition - this describes the conditions at the beginning of the rolling stock - is much more critical than the pulling condition.
• the roll gap is completely filled with rolling stock. If one of the two conditions or both conditions are not met, slippage occurs, i.e. a slip between the roll and the rolling stock.
• the gripping angle and the rolling speed play a role. Gripping capacity decreases with increasing rolling speed.
• the gripping angle which depends on the thickness of the incoming rolling stock, the relative reduction in thickness during rolling and the diameter of the rolls, it must always be smaller than the friction angle in order to enable slip-free rolling.
• the gripping angle in finished streets decreases from the first to the last stand. Then the biggest gripping problems, a slipping at the beginning of the rolling stock, occur in the first finishing stand.
• the roll gap lubrication is used in such a way that the lubrication is only switched on after tapping in the respective stand and is switched off some time before the rolling stock is unthreaded. This leaves enough work roll overruns to completely burn the lubricant on the roll surface. This will prevent gripping at the beginning of the following rolling stock from being endangered.
• the described lubrication strategy results in two different load levels within the rolling stock, provided that the preliminary strip or thin slab runs into the finishing train with homogeneous properties over the length and without speed-up.
• active lubrication By reducing the rolling force with active lubrication, which can be up to 50% and more, the deflection of the work rolls changes. This changes the flatness status (mainly in the rear stands) and the profile (mainly in the front stands) of the rolling stock.
• the invention is therefore based on the object of specifying a method for applying a lubricant to a work or back-up roll surface which enables the rolling process to be improved, leads to a reduction in the wear on the rolls and lowers the energy consumption of the finishing train.
• the decisive advantage of the method according to the invention is that there is a constant level of rolling force over the entire length of the rolling stock the respective stand results because lubrication is maintained over the entire length of the rolling stock.
• a prerequisite for the use of the lubrication according to the invention is that the gripping conditions at the beginning of the rolling stock are ensured.
• the application of the lubricant according to the invention in a finishing train or a casting and rolling plant is advantageously possible from the second stand and for all subsequent stands without restriction.
• no lubricant is generally applied due to the large thickness of the rolling stock (high gripping angle).
• the existing conditions of the respective system are taken into account. These include, for example, the condition of the roll surface after grinding, the work roll diameter, the work roll material, the incoming strip thickness, • the set relative decrease, the surface condition of the incoming rolling stock (scale, temperature, roughness, material etc.), the lubricant used, the amount of lubricant, • the rolling speed.
• the lubricating effect at the beginning of the rolling stock is reduced by a smaller amount of lubricant or by a modified, i.e. Lubricant with other properties limited to the top.
• Another advantage of the method according to the invention is that with constant lubrication, a constant advance is achieved, which in turn results in a constant mass flow.
• the roll gap lubrication is used in order to have a favorable influence on the shear texture on the surface.
• the application of the lubricant according to the invention results in a homogeneous surface texture over the entire length of the rolling stock.
• the lubrication system provides for the construction of a ring line with feedback in the lubricant tank and the installation of a switchable 3/2 way valve in front of the mixer for the lubricant (for example a static tube mixer).

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Metal Rolling (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Continuous Casting (AREA)
• Lubricants (AREA)

Priority Applications (11)

Applications Claiming Priority (4)

Publications (1)

Family

ID=34751257

Family Applications (1)

Country Status (17)

Cited By (1)

Families Citing this family (2)

Citations (4)

Family Cites Families (12)

• 2004
  • 2004-02-07 DE DE102004006130A patent/DE102004006130A1/de not_active Withdrawn
  • 2004-11-30 DE DE502004005872T patent/DE502004005872D1/de not_active Revoked
  • 2004-11-30 RU RU2006108529/02A patent/RU2364454C2/ru active
  • 2004-11-30 CN CN200480038890XA patent/CN1898038B/zh active Active
  • 2004-11-30 WO PCT/EP2004/013571 patent/WO2005065854A1/de active IP Right Grant
  • 2004-11-30 BR BRPI0417850-5A patent/BRPI0417850A/pt not_active Application Discontinuation
  • 2004-11-30 CA CA002547960A patent/CA2547960A1/en not_active Abandoned
  • 2004-11-30 AU AU2004311509A patent/AU2004311509A1/en not_active Abandoned
  • 2004-11-30 JP JP2006545957A patent/JP2007515297A/ja active Pending
  • 2004-11-30 AT AT04820950T patent/ATE382440T1/de not_active IP Right Cessation
  • 2004-11-30 KR KR1020067007511A patent/KR101140808B1/ko active IP Right Grant
  • 2004-11-30 US US10/584,174 patent/US20090038356A1/en not_active Abandoned
  • 2004-11-30 EP EP04820950A patent/EP1704000B1/de not_active Revoked
  • 2004-11-30 ES ES04820950T patent/ES2295981T3/es active Active
  • 2004-12-01 TW TW093137020A patent/TW200533432A/zh unknown
  • 2004-12-22 AR ARP040104885A patent/AR047573A1/es active IP Right Grant
• 2006
  • 2006-02-08 ZA ZA200601118A patent/ZA200601118B/xx unknown
  • 2006-06-06 EG EGNA2006000528 patent/EG24296A/xx active

Patent Citations (4)

Non-Patent Citations (4)

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