US20160059283A1 - Method and rolling stand for cold rolling rolled stock - Google Patents

Method and rolling stand for cold rolling rolled stock Download PDF

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Publication number
US20160059283A1
US20160059283A1 US14/786,210 US201414786210A US2016059283A1 US 20160059283 A1 US20160059283 A1 US 20160059283A1 US 201414786210 A US201414786210 A US 201414786210A US 2016059283 A1 US2016059283 A1 US 2016059283A1
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United States
Prior art keywords
roll
rolling
skin
stand
drive unit
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US14/786,210
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English (en)
Inventor
Michael Breuer
Kerstin Spill
Markus Fischer
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SMS Group GmbH
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SMS Group GmbH
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Assigned to SMS GROUP GMBH reassignment SMS GROUP GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FISCHER, MARKUS, SPILL, Kerstin, BREUER, MICHAEL
Publication of US20160059283A1 publication Critical patent/US20160059283A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/001—Convertible or tiltable stands, e.g. from duo to universal stands, from horizontal to vertical stands
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
    • B21B35/06—Drives for metal-rolling mills, e.g. hydraulic drives for non-continuously-operating mills or for single stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
    • B21B35/14—Couplings, driving spindles, or spindle carriers specially adapted for, or specially arranged in, metal-rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, 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
    • B21B45/0239—Lubricating
    • B21B45/0245—Lubricating devices
    • B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
    • 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
    • B21B2001/221—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 by cold-rolling
    • 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
    • B21B2001/228—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 skin pass rolling or temper rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B21B2013/025—Quarto, four-high stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B21B2013/028—Sixto, six-high stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/12—Rolling load or rolling pressure; roll force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/14—Reduction rate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2269/00—Roll bending or shifting
    • B21B2269/02—Roll bending; vertical bending of rolls
    • B21B2269/04—Work roll bending
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2269/00—Roll bending or shifting
    • B21B2269/02—Roll bending; vertical bending of rolls
    • B21B2269/06—Intermediate roll bending

Definitions

  • the present invention relates to a method and a rolling stand for cold rolling rolled stock.
  • the rolling stand comprises at least an upper and a lower backup roll and also an upper and a lower work roll, which define a roll gap.
  • a lower and an upper intermediate roll may also be provided between the work rolls and the backup rolls.
  • the present invention also relates to the said rolling stand.
  • Rolling stands and methods for their operation are principally known in the prior art, for example from EP 1 318 879 B1, DE 4417274 C2, EP 1 420 898 or from DE 4417274.
  • the prior art basically differentiates between reducing roll stands and rerolling stands.
  • reducing roll stands The purpose of reducing roll stands is to reduce the rolled stock thickness by 30 to 80% per rolling pass. High rolling forces and rolling moments arise at these high levels of reduction. That is why highly effective roller cooling is needed. In this context, up to 10,000 L/min. of coolant volume is recirculated per rolling stand.
  • the work rolls in the reducing roll stand a have relatively smooth surface without special texturing.
  • the upper backup roll rests on the upper intermediate roll and this in turn rests on the upper work roll. In the absence of an intermediate roll, such as in a four-roll stand, the upper backup roll then rests directly on the upper work roll.
  • the rolling forces are in the range of 10 to 20 MN.
  • the rolling moments are in the range of 100 to 200 kNm.
  • a special thickness control is deployed, which can be operated both in positioning control mode as well as in rolling force mode.
  • an essential actuating mechanism of the thickness control are almost exclusively the adjusting cylinders of the backup rolls, and the strip tension only in edge areas.
  • Reducing roll stands can have a six-roll or four-roll design, i.e. they can be designed with six or with four rolls. During reducing operation, both work rolls are typically rotationally driven to transfer a rolling moment onto both work rolls. Such type of reducing roll stands are known both for reducing of ferrous metal as well as for reducing of nonferrous metal. The unique noteworthy difference between operating the reducing stands for ferrous metal and nonferrous metal is in the use of the particular suitable cooling lubricant; the cooling lubricant is one medium which has both cooling and lubricating functions. Rolling oil is typically used as cooling lubricant for nonferrous metal, in particular for aluminum.
  • straight reducing stands for ferrous metal and nonferrous metal just described also straight rerolling stands are known, however only for ferrous metal.
  • the purpose of rerolling stands is the embossing of texture onto the rolled stock to improve the strip flatness and/or improve the material characteristics of the rolled stock, e.g. to eliminate Lüders' bands or to adjust specific strengths. For this reason, the typically smooth work rolls with a surface roughened in a predetermined manner for embossing the texture onto the rolled stock, special skin-pass rolls are used. During skin-pass rolling only a single rolling pass with a rolled stock thickness reduction of 0.3 to 10% is typically performed.
  • Embossing the texture creates material attrition, so-called metal flash, which interferes during further processing and heavily contaminates the dressing medium.
  • metal flash which interferes during further processing and heavily contaminates the dressing medium.
  • the rolling force and the rolling moment are very low compared to reducing operation; during skin-pass rolling the rolling forces are specifically in a range between 1 to 4 MN.
  • the rolling moments are typically in a range of 0 to 20 kNm.
  • the quantity of approximately 20 L/min. of skin-pass rolling medium applied per side of rolled stock is at a significantly lower level when compared to reducing operation.
  • the primary purpose of the dressing medium is essentially the cleaning of the rolled stock or of the rollers.
  • neither of the two work rolls is driven in skin-pass mode; instead, merely the lower backup roll is driven and consequently a rolling moment is transferred to said work rolls.
  • the rolling force can either be applied via the adjusting cylinders of the upper backup roll; this is, however, on the condition that the upper backup roll bears on either the upper work roll or, if available, on the upper intermediate roll.
  • the upper backup roll can also be lifted off the upper work roll or, if available, off the upper intermediate roll.
  • the rolling force is applied during skin-pass mode by means of a suitable adjustment of the upper bending cylinders, which act either on the upper work roll or, if available, on the upper intermediate roll.
  • straight reducing stands and straight rerolling stands there are also combination stands which can be operated both in reducing operation as well as in skin-pass mode, however only for ferrous metal and not for nonferrous metal.
  • the known straight reducing roll stands for nonferrous metal are unsuitable for combined operation, i.e. for alternative skin-pass mode for nonferrous metal, because the reducing roll stands are designed for rolling forces that would be excessive for a skin-pass mode for nonferrous metal.
  • the frictional forces within the hydraulic adjustment are approximately proportional to maximum force, i.e. an adjusting cylinder that was designed for high forces cannot function with the necessary required accuracy at low rolling forces because of its internal friction.
  • the object of the present invention is to develop a known method and a known rolling stand that can be operated optionally in reducing operation or skin-pass mode to the extent that the quality of the rolled stock and the stability of the rolling conditions in the skin-pass mode are improved.
  • This object is accomplished by the method claimed in claim 1 .
  • This method is characterized in that the upper or the lower work roll is disconnected from its drive unit in skin-pass mode. Neither the upper nor the lower backup roll are driven during the skin-pass mode according to the present invention.
  • the claimed method provides that for a significant reduction of the rolled stock thickness the rolling stand can also be operated in a reducing operation operating mode alternatively to the skin-pass mode.
  • a combination stand which facilitates skin-pass rolling of ferrous metal and nonferrous metal and reducing of ferrous metal and nonferrous metal on one stand, offers distinct advantages in particular from a financial perspective compared with two separate stands, i.e. one reducing roll stand and one separate rerolling stand.
  • the upper backup roll is lifted off the upper work roll, or, if present, off the upper intermediate roll, and the application and the adjustment of the rolling force results from the action of the upper bending cylinders on the upper work roll, or, if present, on the upper intermediate roll.
  • the lifting of the upper backup roll off the upper work roll or off the upper intermediate roll provided according to the first exemplary embodiment therefore prevents the described problem of the excessive rolling force, if the backup roll is supported.
  • the upper backup roll can in principle also remain resting on the upper work roll or on the upper intermediate roll during the skin-pass mode; however, then the said disadvantages persist during the fine adjustment of the skin-pass forces.
  • the method according to the present invention provides that the thickness of the rolled stock in skin-pass mode is adjusted to a predetermined constant target thickness with the aid of a skin-pass level control circuit, e.g. by suitable variation of the strip tension of the rolled stock or of the rolled stock speed, as manipulated variables.
  • a prerequisite of the skin-pass level control i.e. the thickness control during skin-pass rolling, is that the rolling force must be kept constant to maintain uniform embossing of the skin-pass roll roughness onto the strip. Preferably, no sudden changes in thickness must arise.
  • the method according to the present invention advantageously provides controlling the rolling force applied on the rolled stock by using a rolling force control circuit, wherein the bending cylinders serve as actuators for the rolling force.
  • a position control circuit is preferably provided to keep the adjustment status of the work rolls constant.
  • Both the rolling force control as well as the position control must be in real time if possible, which is why the step responses of the two control circuits must preferably less than 80 ms.
  • the method according to the present invention optionally provides that a flatness control circuit can also be provided for controlling the flatness of the rolled stock.
  • the flatness control circuit then comprises a flatness measuring device, e.g. a flatness measuring wheel on the rolling stand outlet for recording the actual flatness of the rolled stock.
  • a flatness measuring device e.g. a flatness measuring wheel on the rolling stand outlet for recording the actual flatness of the rolled stock.
  • Such measured actual flatness is compared with a predetermined target flatness, i.e. the difference between these two flatnesses is formed and this difference is provided as a flatness control deviation to a flatness controller, which in accordance with the flatness control deviation generates a suitable actuating signal for an actuating mechanism, for example the upper bending cylinders of the upper intermediate or work roll.
  • the bending cylinders are controlled in this manner such that the flatness at the outlet of the rolling stand ideally corresponds to the predetermined target flatness.
  • the lubricant is recirculated and after use is prefiltered prior to its reuse or its recirculation. During its pre-filtration, potential metal flash particles that could be generated during the skin-pass mode are removed from the lubricant. Preferably, the lubricant will be prefiltered already prior to microfiltration, which is typically done anyway.
  • the involved quantity used is ideally small enough so that it is completely consumed in the roll gap during the skin-pass mode, so that at the rolling stand discharge point no lubricant remains on the rolled stock surface and no lubricant drains laterally from the rolled stock.
  • this minimal quantity lubrication process is an alternative to the lubricant recirculation as described in the previous paragraph. If during the minimum quantity lubrication process small residual lubricant quantities in fact still remain on the rolled stock, these residual quantities can naturally be fed into recirculation anyhow for reuse after prefiltration.
  • the method according to the present invention is provided for nonferrous metal strip or ferrous metal strip as rolled stock.
  • preferably rolling oil is used as lubricant by utilizing its lubricant function.
  • lubricant oil can be used in all operating modes, however, that is both for reducing of nonferrous metal strip or nonferrous metal strip and also for skin-pass rolling of nonferrous metal strip or ferrous metal strip.
  • typically skin-pass rolls with a specific surface roughness are used as work rolls.
  • These skin-pass rolls are preferably cleaned by high-pressure spraying with the lubricant, or by using brushes during work breaks in the skin-pass mode.
  • the cleaning process offers the advantage of increasing the service life of the skin-pass rolls roughened specially for the skin-pass process.
  • the abovementioned problem is furthermore solved by a rolling stand pursuant to claim 11 .
  • This solution is characterized in that the torque transfer device has at least one coupling device and one associated control unit for disconnecting the upper or the lower work roll from the at least one drive unit during the skin-pass mode.
  • the advantages of this solution correspond to the above cited advantages with reference to the described method.
  • FIG. 1 illustrates a four-roll rolling stand designed according to the present invention
  • FIG. 2 illustrates a six-roll rolling stand designed according to the present invention
  • FIG. 3 illustrates the method according to the present invention for adjusting a reducing mode or skin-pass mode on a combination stand.
  • FIG. 1 illustrates a four-roll rolling stand 100 .
  • the rolling stand specifically comprises an upper work roll 120 - 1 , a lower work roll 120 - 2 as well as an upper backup roll 110 - 1 and a lower backup roll 110 - 2 .
  • the work rolls are arranged between the two backup rolls. During rolling operation, the two work rolls define a roll gap 128 for cold rolling rolled stock passing between them.
  • spray bars 195 for application of coolant and lubricant onto the work rolls 120 - 1 are arranged at the level of the upper and lower work rolls 120 - 1 , 120 - 2 .
  • a thickness control circuit 150 is assigned to the rolling stand 100 .
  • a lubricant circulation system and coolant circulation system is assigned to the rolling stand 100 , said circuit comprising devices for collection of the coolant or lubricant draining from the rollers for filtering the used coolant or lubricant and for recycling the purified coolant or lubricant in particular to the work rolls.
  • a recirculation system 192 is used for recycling.
  • a microfilter 194 is typically used for the purification or filtration of the coolant and/or lubricant.
  • an additional pre-filter 190 is provided upstream of this microfilter however for filtering out metal flash from the coolant or lubricant, such as arises during skin-pass rolling of rolled stock. As illustrated in FIG. 1 , this pre-filter 190 can be positioned either upstream or downstream of a recirculation system 192 ; however, in all cases said pre-filter is arranged upstream of the microfilter 194 in the direction of flow.
  • a minimal quantity lubrication process can also take place, during which only sufficient lubricant is applied onto the rolled stock on the feed side and/or onto the work rolls as will actually be used or needed in the roll gap during rolling
  • the work rolls 120 - 1 , 120 - 2 are driven by at least one drive unit 124 , 124 - 1 , 124 - 2 by interposing a torque transfer device 120 ′, 120 ′′.
  • the torque transfer device 120 ′ has an upper coupling device 126 - 1 , an upper drive spindle 122 - 1 and optionally an upper transmission gear for transfer of a torque from the upper drive unit 124 - 1 to the upper work roll 120 - 1 .
  • the upper drive spindle 122 - 1 is arranged between the upper work roll and the upper drive unit 124 - 1
  • the optional transmission gear to 129 - 1 is arranged between the upper drive spindle and the upper drive unit.
  • the upper coupling device 126 - 1 can be arranged between the upper work roll and the upper drive spindle and/or between the upper drive spindle and the upper transmission gear and/or between the upper transmission gear and the upper drive unit, and/or it is designed as no-load position of the upper transmission gear.
  • the torque transfer device 120 ′ comprises a lower coupling device 126 - 2 , a lower drive spindle 122 - 2 and optionally a lower transmission gear 129 - 2 for transferring a torque from the lower drive unit 124 - 2 to the lower work roll 120 - 2 .
  • the upper drive spindle 122 - 2 is arranged between the lower work roll and the upper drive unit 124 - 2 and the optional lower transmission gear 129 - 2 between the lower drive spindle and the lower drive unit.
  • the lower coupling device 126 - 2 can be arranged between the lower work roll and the lower drive spindle and/or between the lower drive spindle and the lower transmission gear and/or between the lower transmission gear and the lower drive unit, and/or it is designed as no-load position of the lower transmission gear.
  • FIG. 1 an example of the upper coupling device is shown in the open, i.e. the disengaged state, while the lower coupling device is shown in the closed, i.e. the engaged state.
  • the moment flow from the drive units 124 , 124 - 1 , 124 - 2 to the work rolls can be optionally interrupted using the coupling devices.
  • the coupling device positive, frictional, magnetic or fluid dynamic modes of action are conceivable.
  • the actuation of the switchable coupling device can have a mechanical, electrical, electromagnetic, pneumatic or any other design.
  • the switchable coupling device can be configured on or in the pinion stand gear drive, within the spindle, or on the roll neck.
  • the four-roll rolling stand 100 can be operated in a skin-pass mode of operation; the associated configuration of the rolling stand 100 is illustrated schematically in FIG. 1 .
  • the two backup rolls 110 - 1 , 110 - 2 are not driven in the skin-pass mode.
  • upper bending cylinders 140 can be recognized in FIG. 1 , which act on the upper work roll 120 - 1 on the drive side AS and on the operator side BS. If rolled stock is present in the roll gap 128 and the two bending cylinders 140 respectively exert half a bending force F/2 onto the upper work roll 120 - 1 , this action of the bending force results in negative bending of the upper work roll.
  • the upper backup roll 110 - 1 is initially lifted-off the upper work roll 120 - 1 .
  • the rolling force, which in skin-pass mode is significantly smaller compared to reducing operation, is expressly desirable in skin-pass mode, because in skin-pass mode the emphasis is not on the thickness reduction but merely on embossing a surface roughness structure predetermined by the work rolls in form of skin-pass rolls onto the surface of the rolled stock.
  • the rolling force applied on the rolled stock in skin-pass mode is additionally determined respectively by half of the bending force applied additionally from the two bending cylinders 140 on the operator side BS and the drive side AS of the rolling stand.
  • an operating point for the total rolling force acting on the rolled stock can be defined and this rolling force can be kept constant or be corrected, if desired, using the assigned rolling force control circuit 160 . If the bending cylinders 140 are used for the accurate adjustment of the rolling force in this manner, this is also referred to as expanded bending system.
  • a particular distinctive mark of the skin-pass mode according to the present invention moreover is that neither of the two backup rolls 110 - 1 , 110 - 2 and also only one of the two work rolls 120 - 1 , 120 - 2 is driven.
  • An example of this is the lower work roll 120 - 2 in FIG. 1 .
  • Said lower work roll is coupled by means of the closed lower coupling device 126 - 2 and the lower drive shaft 122 - 2 and optionally by means of the transmission gear 129 - 2 onto the lower drive unit 124 - 2 , while the upper work roll 120 - 2 is disconnected from the upper drive unit 124 - 1 assigned to it by means of the open upper coupling device 126 - 1 .
  • the thickness reduction of the rolled stock is significantly less in skin-pass mode than in reducing operation. But thickness reduction can also take place during skin-pass mode, nevertheless; said thickness reduction is then typically referred to as skin-pass level control and is performed using a skin-pass level control circuit 150 .
  • the skin-pass level control circuit controls the thickness reduction of the rolled stock during the skin-pass mode to a predetermined constant target thickness by suitable variation of the strip tension of the rolled stock or by suitable variation of the rolling speed.
  • the strip tension or the rolling speed serve as manipulated variables for the skin-pass level control.
  • a position control circuit 170 can be assigned to the rolling stand for keeping the adjusting position of the work rolls constant. This can be recorded either directly or indirectly metrologically by evaluation of the positions of the bending cylinders 140 and be controlled by means of the bending cylinders as actuating mechanisms. Both the control of the rolling force as well as the control of the position of the work rolls will preferably take place in real time. For this purpose, the respective control circuits must be correspondingly quick; preferably, their step responses are shorter than 80 ms.
  • a flatness control circuit 180 for controlling the flatness of the rolled stock can be assigned to the rolling stand.
  • the flatness control circuit 180 includes a measuring element 197 , for example a flatness measuring wheel for recording the rolled stock at the rolling stand outlet and for recording the actual flatness of the rolled stock there.
  • This measured actual flatness of the rolled stock is compared by subtraction with a predetermined target flatness and the flatness deviation resulting from the subtraction is evaluated by a flatness controller, which in accordance with the flatness control deviation outputs a control signal to the actuating mechanisms, for example to the upper negative-acting bending cylinders 140 , for controlling the flatness to the predetermined target flatness.
  • the rolling stand is designed either for cold rolling of ferrous metal strip or of nonferrous metal strip.
  • rolling oil or also a water/oil mixture is used as cooling lubricant.
  • the rolling stand is designed as combination rolling stand, which can be operated either in a reducing operating mode or in a skin-pass mode.
  • FIG. 2 in contrast to FIG. 1 , illustrates a six-roll rolling stand. This differs from the four-roll rolling stand shown in FIG. 1 by having an upper intermediate roll 130 - 1 , which is arranged between the upper work roll and the upper backup roll, and a lower intermediate roll 130 - 2 , which is arranged between the lower work roll and the lower backup roll.
  • FIG. 2 illustrates the operation of this six-roll rolling stand in the skin-pass operating mode, in which the upper backup roll 110 - 1 is lifted off the upper intermediate roll 130 - 1 .
  • the upper bending cylinders 140 now do not act on the upper work roll 120 - 1 , but on the upper intermediate roll 130 - 1 .
  • the structure of the rolling stand and the functionality or method of operation of the rolling stand in skin-pass mode correspond to the data described above with reference to FIG. 1 .
  • FIG. 2 illustrates a second embodiment of the torque transfer device 120 ′′.
  • the torque transfer device 120 ′′ has an upper and a lower drive spindle 122 - 1 , 122 - 2 as well as a pinion stand gear drive 129 for transferring a torque from the sole drive unit 124 to at least one of the work rolls 120 - 1 , 120 - 2 .
  • the pinion stand gear drive is connected on its moment input with the sole drive unit 124 .
  • the upper drive spindle 122 - 1 is arranged between the upper work roll and the upper moment output of the pinion stand gear drive
  • the lower drive spindle 122 - 2 is arranged between the lower work roll and the lower moment output of the pinion stand gear drive
  • the pinion stand gear drive 129 is arranged between the upper and the lower drive spindle and the drive unit 124 .
  • the coupling device 126 can be arranged between the upper work roll and the upper drive spindle and/or between the upper drive spindle and the pinion stand gear drive and/or between the lower work roll and the lower drive spindle and/or between the lower drive spindle and the pinion stand gear drive, or it is designed as no-load position of the pinion stand gear drive.
  • the torque transfer device 120 ′ can be operated not only in conjunction with a four-roll stand, as shown in FIG. 1 , but also in conjunction with a six-roll stand.
  • the torque transfer device 120 ′′ can be operated not only in conjunction with a six-roll stand, as shown in FIG. 2 , but also in conjunction with a four-roll stand.
  • a control unit 127 is assigned to the coupling devices.
  • the control unit makes it possible to open or close the coupling devices either in the reducing operating mode or in the skin-pass operating mode, depending on the rolling stand operation.
  • FIG. 3 finally illustrates the necessary process steps for selecting either the reducing operating mode or the skin-pass operating mode on a combination rolling stand which can run both operating modi alternatively.
  • the stand parameters are initially adjusted to reducing operation.
  • the technological control circuits such as the thickness control circuit for which the recording of the rolling force and position of the adjustments are essential, as well as the flatness control circuit, for which the available actuating mechanisms are essential, are parameterized accordingly.
  • the technological control circuits are activated both in skin-pass mode as well as in reducing operation, but are possibly parameterized differently.
  • the thickness control in reducing operation is typically in the form of a monitor or mass flow control. All rolls are integrated in the flux of force.
  • the adjustment of the rolling force and of the position of the work rolls in reducing operation is by means of the adjusting cylinders, which act on the upper backup roll resting on the upper intermediate roll or on the upper work roll. If intermediate rolls are available, these are in contact with the work rolls. Accordingly, in reducing operation these adjusting cylinders must be operated as actuating mechanisms in the said control circuits.
  • both work rolls are rotationally driven from the at least one drive unit 124 , 124 - 1 , 124 - 2 by means of the torque transfer device 120 ′, 120 ′′.
  • rolls with a smooth surface are typically selected as work rolls. After completion of all said steps, the rolling stand is then essentially ready for rolling.
  • one of the two work rolls within the torque transfer device 120 ′, 120 ′ is uncoupled from the drive unit by means of the coupling device, while the other work roll remains to be coupled-up. Subsequently, it is then checked, whether the rolling force to be expected in skin-pass mode is greater or not than a predetermined rolling force threshold value F-Grenz. If this is not the case, the upper backup roll is lifted off the upper work roll or off the upper intermediate roll.
  • the rolling force circuit and the position control circuit are configured such that the upper bending cylinders 140 are controlled as actuating mechanisms.
  • the thickness control in skin-pass mode is typically done as skin-pass level control. If the rolling force to be adjusted in skin-pass mode exceeds the predetermined threshold value, the upper backup roll is placed onto the upper work roll or onto the upper intermediate roll.
  • all stand parameters in particular all target values for the control circuits activated in skin-pass mode are adjusted to suitable target values in the skin-pass mode.
  • the stand parameters are adjusted to ensure the definite feedthrough of the bending systems and the required stand rigidity parameters for the thickness control. These parameters differ significantly, depending on the selected mode of operation, but also in the selected form of application of the upper backup roll.
  • the work rolls used are typically special skin-pass rolls with a predetermined surface roughness.
  • a minimal quantity lubrication process or alternatively a lubricant recirculation system with the pre-filter 190 can be provided to isolate the abraded particles (metal flash) from the lubricant in skin-pass mode and therefore relieve the load on the main filter.
  • the rolling stand is then essentially ready for rolling.
  • the combination rolling stand according to the present invention is designed suitable to be converted from the reducing configuration into the skin-pass configuration and vice versa.
  • the upper backup roll must optionally be placeable onto the upper work roll and be lifted off same
  • the upper and the lower work roll must be suitable for coupling and decoupling onto or from the drive unit either individually or as a pair
  • the smooth reducing work rolls and the roughened skin-pass work rolls must be interchangeable.
  • the prefilter for filtering of metal flash in skin-pass mode may be removable during conversion to reducing operation, because this prefilter can typically be dispensed with in reducing operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Control Of Metal Rolling (AREA)
US14/786,210 2013-04-26 2014-04-25 Method and rolling stand for cold rolling rolled stock Abandoned US20160059283A1 (en)

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DE102013207690.8 2013-04-26
DE102013207690 2013-04-26
DE102013224647 2013-11-29
DE102013224647.1 2013-11-29
PCT/EP2014/058503 WO2014174099A1 (de) 2013-04-26 2014-04-25 Verfahren und walzgerüst zum kaltwalzen von walzgut

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EP (1) EP2988884B1 (de)
JP (1) JP2016531754A (de)
KR (1) KR101737945B1 (de)
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CN112207139A (zh) * 2020-11-04 2021-01-12 攀枝花学院 六辊平整机轧制力的计算方法
US20210346927A1 (en) * 2016-12-30 2021-11-11 Outokumpu Oyj Method for manufacturing flexible rolling of metal strips
US11351584B2 (en) * 2019-04-25 2022-06-07 Toyota Jidosha Kabushiki Kaisha Calibration determination device and calibration determination method for calibrating the tension of a bonding member

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CN105013836B (zh) * 2015-07-25 2017-04-05 北京首钢自动化信息技术有限公司 无延伸率检测状态下平整机轧制力控制装置及其方法
CN110216153B (zh) * 2019-06-11 2021-05-25 攀钢集团攀枝花钢钒有限公司 用于轧辊辊缝形状的控制方法及其轧机
EP3791971A1 (de) * 2019-09-10 2021-03-17 Primetals Technologies Austria GmbH Kaltwalzen eines walzguts in einer walzstrasse mit mehreren walzgerüsten
DE102020212436A1 (de) 2020-10-01 2022-04-07 Thyssenkrupp Steel Europe Ag Verfahren zur Herstellung eines dressierten Kaltbands
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US11865598B2 (en) * 2016-12-30 2024-01-09 Outokumpu Oyj Method for manufacturing flexible rolling of metal strips
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US11351584B2 (en) * 2019-04-25 2022-06-07 Toyota Jidosha Kabushiki Kaisha Calibration determination device and calibration determination method for calibrating the tension of a bonding member
CN112207139A (zh) * 2020-11-04 2021-01-12 攀枝花学院 六辊平整机轧制力的计算方法

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DE102014207859A1 (de) 2014-10-30
JP2016531754A (ja) 2016-10-13
WO2014174099A1 (de) 2014-10-30
EP2988884B1 (de) 2016-12-14
KR20150139571A (ko) 2015-12-11
EP2988884A1 (de) 2016-03-02
CN105142810A (zh) 2015-12-09
KR101737945B1 (ko) 2017-05-19

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