US20090031777A1 - Method for thickness regulation during a hot-rolling process - Google Patents

Method for thickness regulation during a hot-rolling process Download PDF

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Publication number
US20090031777A1
US20090031777A1 US11/990,529 US99052906A US2009031777A1 US 20090031777 A1 US20090031777 A1 US 20090031777A1 US 99052906 A US99052906 A US 99052906A US 2009031777 A1 US2009031777 A1 US 2009031777A1
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sheet
gage
rolling
automatic
strip
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US11/990,529
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Olaf Norman Jepsen
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SMS Siemag AG
SMA DEMAG AG
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SMA DEMAG AG
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Publication of US20090031777A1 publication Critical patent/US20090031777A1/en
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    • 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
    • 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
    • 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
    • B21B1/30—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 non-continuous process
    • B21B1/32—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 non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • B21B1/34—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 non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by hot-rolling
    • 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
    • B21B2271/00—Mill stand parameters
    • B21B2271/02—Roll gap, screw-down position, draft position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2271/00—Mill stand parameters
    • B21B2271/06—Mill spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • B21B31/32—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis by liquid pressure, e.g. hydromechanical adjusting
    • 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
    • B21B37/58—Roll-force control; Roll-gap control
    • B21B37/62—Roll-force control; Roll-gap control by control of a hydraulic adjusting device
    • 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
    • B21B37/58—Roll-force control; Roll-gap control
    • B21B37/64—Mill spring or roll spring compensation systems, e.g. control of prestressed mill stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/08—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll-force

Definitions

  • the invention concerns a method for automatic gage control during rolling, especially hot rolling, with at least one rolling stand, where factors that are considered include the present mean position of the adjustment cylinders of the rolling stand and their total rolling force.
  • DE 20 20 402 discloses a method for calculating the gage G 1 of a thin, hard workpiece after a reducing pass through a reducing mill train with opposing rolling surfaces and a measuring instrument for measuring the roll separating forces, which are produced during the passage of the workpiece through the opposing rolling surfaces during a reducing operation, in which
  • a signal that is a measure of a calculated stretch error is generated by varying the signal that represents the range of uncertainty as a function of the draft predicted for the reducing pass, of the mill stretch predicted for the reducing pass, and of the relative probability of error in predicting both draft and mill stretch, and
  • a signal that is a measure of the calculated gage G 1 is generated by adding the signal that represents the gage G 3 to the calculated stretch error.
  • a supplementary set value is added, which is formed from the difference between the actual value (F r ) of the prestressing force and the initial value (F r0 ) of the prestressing force and is evaluated with the ratio (c a /(c i +c a )) of the spring stiffness (c a ) of the outer part of the stand to the sum of the spring stiffness (c i ) of the inner part of the stand and the spring stiffness (c a ) of the outer part of the stand.
  • the so-called gage meter principle for determining the present strip gage has been used for automatic gage control during hot strip rolling.
  • the measured S DS , S OS of the adjustment cylinders is corrected by the calculated mill stretch g (see also FIG. 1 ).
  • the mill stretch g is calculated with the use of the measured rolling force F DS , F OS and a mill stretch curve 1 /M G .
  • the strip gage determined in this way is then compared with the gage set value and automatically controlled. Besides the measurements of position and rolling force, an exact mill model is needed for this method.
  • the objective of the invention is to improve a method of the type described above in such a way that the disadvantages specified above are avoided.
  • this objective is achieved by minimizing the mill stretch component. This is accomplished by carrying out at least one additional position measurement by detecting position signals in the immediate vicinity of the roll gap of the rolling stands. In this connection, especially the position signals between the work rolls and/or the backup rolls and/or the work roll chocks and/or the backup roll chocks are to be considered/detected.
  • the advantage of the method of the invention is that the position measurement contains a smaller mill stretch component. Thus, only the roll flattening and the roll bending are to be considered. Other components, such as the expansion of the columns and the crossheads, do not have to be considered. Specifically in the measurement of the separation of the work roll chocks, the suspension of the Morgoil bearings, the bending of the backup rolls, and backup roll eccentricities do not have to be taken into consideration. As shown in FIG. 2 , the prior-art method for automatic gage control is still used in its entirety and is improved or expanded by the features described above.
  • the method of the invention results in a more exact determination of the strip gage in the case of hard materials and, especially in the case of thin strip rolling, improves the dynamic behavior of the automatic gage control system.
  • the signals that are obtained can also be used for automatic position control and/or for automatic swivel control and/or for calculation of the strip gage and thus for automatic control of the strip gage.
  • FIG. 1 shows a flowchart for automatic gage control in accordance with the prior art.
  • FIG. 2 shows a flowchart for automatic gage control in accordance with the invention.
  • FIG. 1 shows a flowchart of prior-art automatic gage control during rolling, especially hot rolling.
  • a rolling stand consisting, for example, of a pair of work rolls AW and a pair of backup rolls SW has an operating side OS and a drive side DS.
  • a strip B is positioned between the pair of work rolls AW.
  • the cylinder position of the operating side S OS and the cylinder position of the drive side S DS are determined, and the present mean cylinder position S ACT is determined.
  • the total rolling force F ACT is determined by determining the rolling force on the operating side F OS and the rolling force on the drive side F DS .
  • the mill stretch g is calculated with the use of the total rolling force F ACT and a mill stretch curve 1 /M G .
  • the present strip gage h ACT is determined by measurement of the present mean cylinder position S ACT and the calculated mill stretch g.
  • the present strip gage h ACT is compared with the strip gage set value h REF and used for automatic gage control.
  • the automatic gage controller outputs the position set value for the automatic cylinder position control system.
  • the prior-art automatic control system is improved as shown in the flowchart in FIG. 2 .
  • the separation of the work roll chocks on the operating side S ROS and on the drive side S RDS is measured, and then the mean separation of the work roll chocks S R is determined.
  • the value for the present mean cylinder position S ACT which continues to be determined, as in the prior art, is directly compared with the cylinder position set value S REF .
  • the values of the rolling force on the operating side F OS and the rolling force on the drive side F DS also continue to be determined and lead to the total rolling force F ACT . These are combined, in accordance with the invention, with a mill modulus M R with respect to the work roll chocks, and then the mill stretch g R with respect to the work roll chocks is determined.
  • the mill modulus M R depends on the selected position measurement.
  • the position signals of the position measurement that are to be taken into consideration for the method, with at least one position signal being required, are determined between the work rolls AW and/or the backup rolls SW and/or the work roll chocks and/or the backup roll chocks.
  • the mill stretch to be taken into consideration in the method of the invention is to be coordinated with the given site of the position signal that is obtained.
  • the separation on the operating side S ROS and the separation on the drive side S RDS lead to the mean separation of the work roll chocks S R , for example.
  • the present strip gage h ACT is determined from the separation of the work roll chocks S R and the mill stretch with respect to the work roll chocks g R and is then compared with the strip gage set value h REF and automatically controlled.

Abstract

A flooring system comprises a preformed composite panel having a first sheet (2), a second sheet (3) and a core of insulating material between the first and second sheets (2, 3). In one case the sheet (2) is a generally flat top sheet and the sheet (3) is a profiled bottom sheet. A floor such as a wood effect floor (5) is laid over the flat top sheet (2). An acoustic barrier layer 6 is located between the floor (5) and the sheet (2). The profiling of the sheet (3) defines channels (7) for location of service ducts/conduits (11). A planar facing (8) is applied over the profiled sheet, bridging the channels (7).

Description

  • The invention concerns a method for automatic gage control during rolling, especially hot rolling, with at least one rolling stand, where factors that are considered include the present mean position of the adjustment cylinders of the rolling stand and their total rolling force.
  • DE 20 20 402 discloses a method for calculating the gage G1 of a thin, hard workpiece after a reducing pass through a reducing mill train with opposing rolling surfaces and a measuring instrument for measuring the roll separating forces, which are produced during the passage of the workpiece through the opposing rolling surfaces during a reducing operation, in which
  • (a) a signal that is a measure of the gage G5 is generated, which is determined by the point of intersection of an appropriate mill stretch curve and an appropriate workpiece deformation curve for the reducing operation,
  • (b) a signal that is a measure of a gage G3 is generated, which is determined by the point of intersection of the measured force curve and the mill stretch curve,
  • (c) a signal that is a measure of a range of uncertainty is generated, which is determined by the difference between signals representing the gages G5 and G3,
  • (d) a signal that is a measure of a calculated stretch error is generated by varying the signal that represents the range of uncertainty as a function of the draft predicted for the reducing pass, of the mill stretch predicted for the reducing pass, and of the relative probability of error in predicting both draft and mill stretch, and
  • (e) a signal that is a measure of the calculated gage G1 is generated by adding the signal that represents the gage G3 to the calculated stretch error.
  • DE 26 57 455 A1 describes a method for compensating roll deformation in rolling stands with prestressing that can be automatically controlled, in which the strip thickness is automatically controlled by hydraulic actuators, and in which the contact force (Fa), which is the sum of the rolling force and the automatically controllable prestressing force according to the following equation:

  • F a=(F a0+(F r −F r0))*c a/(c i +c a),
  • is varied by hydraulic prestressing cylinders in such a way that, to the base set value (Fa0) of the contact force, a supplementary set value is added, which is formed from the difference between the actual value (Fr) of the prestressing force and the initial value (Fr0) of the prestressing force and is evaluated with the ratio (ca/(ci+ca)) of the spring stiffness (ca) of the outer part of the stand to the sum of the spring stiffness (ci) of the inner part of the stand and the spring stiffness (ca) of the outer part of the stand.
  • DE 16 02 195 A1 discloses a method for calculating the gage of thin, hard workpieces, in which
      • a signal that is a measure of the gage G5 is generated, which is determined by the point of intersection of an appropriate mill stretch curve and an appropriate workpiece deformation curve for the reducing operation,
      • a signal that is a measure of a gage G3 is generated, which is determined by the point of intersection of the measured force curve and the mill stretch curve,
      • a signal that is a measure of a range of uncertainty is generated, which is determined by the difference between signals representing the gages G5 and G3,
      • a signal that is a measure of a calculated stretch error is generated by varying the signal that represents the range of uncertainty as a function of the mill stretch predicted for the reducing pass and of the relative probability of error in predicting both draft and mill stretch, and
      • a signal that is a measure of the calculated gage G1 is generated by adding the signal that represents the gage G3 to the calculated stretch error.
  • Until now, the so-called gage meter principle for determining the present strip gage has been used for automatic gage control during hot strip rolling. To this end, the measured SDS, SOS of the adjustment cylinders is corrected by the calculated mill stretch g (see also FIG. 1). The mill stretch g is calculated with the use of the measured rolling force FDS, FOS and a mill stretch curve 1/MG. The strip gage determined in this way is then compared with the gage set value and automatically controlled. Besides the measurements of position and rolling force, an exact mill model is needed for this method.
  • In the rolling of hard materials and thin strip, small inaccuracies in the mill model lead to relatively large errors in the strip gage and sometimes instability of the automatic gage control system.
  • Therefore, the objective of the invention is to improve a method of the type described above in such a way that the disadvantages specified above are avoided.
  • In accordance with the invention, this objective is achieved by minimizing the mill stretch component. This is accomplished by carrying out at least one additional position measurement by detecting position signals in the immediate vicinity of the roll gap of the rolling stands. In this connection, especially the position signals between the work rolls and/or the backup rolls and/or the work roll chocks and/or the backup roll chocks are to be considered/detected.
  • The advantage of the method of the invention is that the position measurement contains a smaller mill stretch component. Thus, only the roll flattening and the roll bending are to be considered. Other components, such as the expansion of the columns and the crossheads, do not have to be considered. Specifically in the measurement of the separation of the work roll chocks, the suspension of the Morgoil bearings, the bending of the backup rolls, and backup roll eccentricities do not have to be taken into consideration. As shown in FIG. 2, the prior-art method for automatic gage control is still used in its entirety and is improved or expanded by the features described above.
  • The method of the invention results in a more exact determination of the strip gage in the case of hard materials and, especially in the case of thin strip rolling, improves the dynamic behavior of the automatic gage control system.
  • In a further development of the invention, the signals that are obtained can also be used for automatic position control and/or for automatic swivel control and/or for calculation of the strip gage and thus for automatic control of the strip gage.
  • A specific embodiment of the invention is described in greater detail below with reference to the accompanying schematic drawings.
  • FIG. 1 shows a flowchart for automatic gage control in accordance with the prior art.
  • FIG. 2 shows a flowchart for automatic gage control in accordance with the invention.
    •
  • FIG. 1 shows a flowchart of prior-art automatic gage control during rolling, especially hot rolling. A rolling stand consisting, for example, of a pair of work rolls AW and a pair of backup rolls SW has an operating side OS and a drive side DS. A strip B is positioned between the pair of work rolls AW. In the previously known method for automatic gage control, the cylinder position of the operating side SOS and the cylinder position of the drive side SDS are determined, and the present mean cylinder position SACT is determined. In addition, the total rolling force FACT is determined by determining the rolling force on the operating side FOS and the rolling force on the drive side FDS. The mill stretch g is calculated with the use of the total rolling force FACT and a mill stretch curve 1/MG. The present strip gage hACT is determined by measurement of the present mean cylinder position SACT and the calculated mill stretch g. The present strip gage hACT is compared with the strip gage set value hREF and used for automatic gage control. The automatic gage controller outputs the position set value for the automatic cylinder position control system.
  • In accordance with the invention, the prior-art automatic control system is improved as shown in the flowchart in FIG. 2. To this end, for example, the separation of the work roll chocks on the operating side SROS and on the drive side SRDS is measured, and then the mean separation of the work roll chocks SR is determined. The value for the present mean cylinder position SACT, which continues to be determined, as in the prior art, is directly compared with the cylinder position set value SREF.
  • The values of the rolling force on the operating side FOS and the rolling force on the drive side FDS also continue to be determined and lead to the total rolling force FACT. These are combined, in accordance with the invention, with a mill modulus MR with respect to the work roll chocks, and then the mill stretch gR with respect to the work roll chocks is determined.
  • In accordance with the invention, the mill modulus MR depends on the selected position measurement. The position signals of the position measurement that are to be taken into consideration for the method, with at least one position signal being required, are determined between the work rolls AW and/or the backup rolls SW and/or the work roll chocks and/or the backup roll chocks. The mill stretch to be taken into consideration in the method of the invention is to be coordinated with the given site of the position signal that is obtained.
  • The separation on the operating side SROS and the separation on the drive side SRDS lead to the mean separation of the work roll chocks SR, for example. The present strip gage hACT is determined from the separation of the work roll chocks SR and the mill stretch with respect to the work roll chocks gR and is then compared with the strip gage set value hREF and automatically controlled.
    • LIST OF REFERENCE SYMBOLS
    • AW work roll
    • SW backup roll
    • W rolling stand
    • B strip
    • DS drive side
    • OS operating side
    • FACT total rolling force
    • FOS rolling force on the operating side
    • FDS rolling force on the drive side
    • SACT present mean cylinder position
    • SOS cylinder position on the operating side
    • SDS cylinder position on the drive side
    • SREF cylinder position set value
    • hACT present strip gage
    • hREF strip gage set value
    • SR mean separation of the work roll chocks
    • SROS separation on the operating side
    • SRDS separation on the drive side
    • gR mill stretch with respect to the work roll chocks
    • MR mill model with respect to the work roll chocks
    • g mill stretch
    • MG mill modulus

Claims (4)

1. A method for automatic gage control during hot rolling with at least one rolling stand, where factors that are considered include the present mean position of the adjustment cylinders of the rolling stand and their total rolling force, wherein at least one additional position measurement is carried out by detecting position signals in the immediate vicinity of the roll gap of the rolling stands and that the position signals are used for calculating the strip gage.
2. A method in accordance with claim 1, wherein the position signals are detected between the work rolls and/or the backup rolls and/or the work roll chocks and/or the backup roll chocks.
3. A method in accordance with claim 1, wherein the position signals are used for automatic position control.
4. A method in accordance with claim 1, wherein the position signals are used for automatic swivel control.
US11/990,529 2005-08-26 2006-07-24 Method for thickness regulation during a hot-rolling process Abandoned US20090031777A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10-2005-040-690.4 2005-08-26
DE102005040690 2005-08-26
DE102005042837A DE102005042837A1 (en) 2005-08-26 2005-09-09 Method for thickness control during hot rolling
DE10-2005-042-837.1 2005-09-09
PCT/EP2006/007249 WO2007022841A1 (en) 2005-08-26 2006-07-24 Method for thickness regulation during a hot-rolling process

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US (1) US20090031777A1 (en)
EP (1) EP1919638A1 (en)
JP (1) JP2009505835A (en)
KR (1) KR20080037010A (en)
AU (1) AU2006284201A1 (en)
BR (1) BRPI0615089A2 (en)
CA (1) CA2620000A1 (en)
DE (1) DE102005042837A1 (en)
MX (1) MX2008002631A (en)
RU (1) RU2008111505A (en)
TW (1) TW200709865A (en)
WO (1) WO2007022841A1 (en)

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CN103706644B (en) * 2013-12-20 2016-04-27 秦皇岛首秦金属材料有限公司 Based on the fixed value of roller slit self-adaptation control method of calibrator detect thickness
DE102021209714A1 (en) * 2020-09-22 2022-03-24 Sms Group Gmbh Device and method for rolling metal strip

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WO2007022841A1 (en) 2007-03-01
KR20080037010A (en) 2008-04-29
AU2006284201A1 (en) 2007-03-01
MX2008002631A (en) 2008-03-14
JP2009505835A (en) 2009-02-12
BRPI0615089A2 (en) 2011-05-03
EP1919638A1 (en) 2008-05-14
AU2006284201A2 (en) 2008-05-01
DE102005042837A1 (en) 2007-03-08
TW200709865A (en) 2007-03-16
CA2620000A1 (en) 2007-03-01
RU2008111505A (en) 2009-10-10

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