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 concerns a method for the rolling of rolling stock, especially for the rolling of hot-rolled wide strip in a finishing train or a continuous casting installation, in which a lubricant is applied directly to the surface of the work rolls or indirectly to the surface of the backup rolls and is then transferred to the surface of the work rolls, before the rolling stock enters the roll gap of a rolling stand, wherein a strongly adherent lubricant film forms on the surface of the work rolls and leads to reduction of friction in the roll gap as an intermediate layer between the roll and the rolling stock.
• DE 21 05 975 discloses a device for automatically feeding oil to a hot-rolling mill stand through which rolling stock is passing.
• the device comprises an oil spraying device for the rolling stand, means for feeding oil to the spraying device, means for initiating operation of the oil feed device shortly after the leading end of the rolling stock passes through the rolling stand, and means for terminating operation of the oil feed device shortly before the trailing end of the rolling stock reaches the rolling stand.
• DE 20 22 923 discloses a method and a device for applying a lubricant to rolling stock in a hot-rolling strip mill, wherein lubricant and atomizing air are delivered to several spray nozzles in a four-high rolling stand equipped with two work rolls and two backup rolls.
• the spray nozzles are arranged across the width of at least one of the backup rolls.
• the lubricant is applied to the backup rolls, from which it is transferred to the work rolls.
• the flow of lubricant and atomizing air to the nozzles is cut off as soon as the rolling stock leaves the work rolls.
• the starting time for the lubricant feed is the start of the pass in the given stand.
• a disadvantage of this method and this device is that a closed lubricant film must first form on the surface of the backup roll and then be transferred to the surface of the work roll in the gap between the backup roll and work roll. From the work roll, the lubricant enters the roll gap. It takes too much time for the lubricant to reach the rolling stock (several seconds), depending on the peripheral speed and diameter of the roll. In a method of this type and a device of this type, the leading end of the strip is not supplied with lubricant as it enters the roll gap, which temporarily results in higher rolling forces.
• the bite condition which describes the conditions at the leading end of the rolling stock, is much more critical than the pass condition. In the pass condition, the roll gap is completely filled with rolling stock.
• the bite angle and the rolling speed play a role.
• the bite capacity decreases with increasing rolling speed.
• the bite angle which depends on the thickness of the entering rolling stock, the relative thickness reduction during rolling, and the diameter of the rolls, it can be said that it must always be smaller than the friction angle to allow slip-free rolling.
• the bite angle in finishing trains decreases from the first to the last stand. Accordingly, the greatest bite problems, mainly slipping at the leading end of the rolling stock, occur in the first finishing stand.
• the roll gap lubrication is adjusted in such a way that the lubrication is not turned on until after the initial pass has started in the given stand and is turned off a certain amount of time before the rolling stock exits the stand. This allows the work rolls to continue rolling sufficiently long for the lubricant present on the surface of the rolls to burn off completely. In this way, the bite at the leading end of the following piece of rolling stock is not jeopardized.
• the objective of the invention is to specify a method for applying a lubricant to the surface of a work roll or backup roll, which improves the rolling process, leads to a reduction of roll wear, and lowers the power consumption of the finishing train.
• the decisive advantage of the method of the invention is that a constant level of rolling force for the given stand is obtained over the entire length of the rolling stock, because the lubrication is maintained over the entire length of the rolling stock.
• greater total rolling force reductions can be achieved, for example, 40-50%, so that the loading of the rolling train is greatly reduced with respect to wear and power consumption.
• the greater rolling force reduction reduces work roll wear and thus increases the useful life of the rolls (service life).
• a prerequisite for the use of the lubrication of the invention is that the bite conditions at the leading end of the rolling stock are ensured.
• Lubricant is generally not applied in the first finishing stand due to the great thickness of the rolling stock (large bite angle).
• the conditions existing in the given installation are taken into consideration. These include, for example
• the lubricating action at the leading end of the rolling stock is upwardly limited by a smaller amount of lubricant or by a modified lubricant, i.e., a lubricant with different properties.
• the pass program model of the finishing train for this operation.
• at least a doubling of the adaptation matrix should be provided so as not to adversely affect the adapted operation without roll gap lubrication.
• the selection of different sets of coefficients of friction—for the lubricated and unlubricated state— is highly advantageous for the startup, when new products are introduced, and for avoiding high adaptation values.
• Another advantage of the method of the invention is that, when constant lubrication is provided, constant forward slip is achieved, which in turn results in constant mass flow.
• the roll gap lubrication is used to have a favorable effect on the shear texture of the surface.
• the application of the lubricant in accordance with the invention produces a homogeneous surface texture over the whole length of the rolled product.
• the lubrication system is provided with a closed-circulation line with return to the lubricant tank and a switchable 3/2-way valve before the lubricant mixer (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)

Applications Claiming Priority (5)

Publications (1)

Family

ID=34751257

Family Applications (1)

Country Status (17)

Cited By (1)

Families Citing this family (2)

Citations (5)

Family Cites Families (11)

• 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 (5)

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