EP0005450A2 - Agencement pour traiter des changements de hauteur de la ligne de passe dans un laminoir continu - Google Patents

Agencement pour traiter des changements de hauteur de la ligne de passe dans un laminoir continu Download PDF

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Publication number
EP0005450A2
EP0005450A2 EP79101106A EP79101106A EP0005450A2 EP 0005450 A2 EP0005450 A2 EP 0005450A2 EP 79101106 A EP79101106 A EP 79101106A EP 79101106 A EP79101106 A EP 79101106A EP 0005450 A2 EP0005450 A2 EP 0005450A2
Authority
EP
European Patent Office
Prior art keywords
line height
pass line
strip
tension
rolling line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP79101106A
Other languages
German (de)
English (en)
Other versions
EP0005450A3 (fr
Inventor
Karl-Friedel Driehorn
Adolf Heindel
Dirk Dr.-Ing. Hoffmann
Peter Sopp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Estel Hoesch Werke AG
Hoesch AG
Original Assignee
Estel Hoesch Werke AG
Hoesch AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Estel Hoesch Werke AG, Hoesch AG filed Critical Estel Hoesch Werke AG
Publication of EP0005450A2 publication Critical patent/EP0005450A2/fr
Publication of EP0005450A3 publication Critical patent/EP0005450A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B21B37/48—Tension control; Compression control
    • B21B37/50—Tension control; Compression control by looper control

Definitions

  • the invention relates to an arrangement for the operational detection of the change in the rolling line height in a rolling mill with a plurality of stands, between which loop lifters are arranged, the lifting arm spanning an angle ⁇ between the rolling line and the arm axis, and for correcting the strip supply and / or tension within the rolled strip when it occurs a change in the rolling line height.
  • Broadband rolling mills known per se are divided into a roughing and an intermediate line, which can be designed as reversing or semi-continuous lines, and into a continuous broadband finishing line.
  • the hot strip is given its final dimensions and shape in the latter. Influencing factors are roll gap, roll peripheral speed, roll shape, rolling force and tension between the roll stands.
  • the train Z has a decisive influence and must therefore be kept constant even if the material flow is temporarily disrupted. This is achieved by allowing a so-called loop between the individual scaffolds, the length L of which is regulated.
  • loop lifters are installed, which are attached to the underside of the with rollers that are attached to a loop lifter arm
  • control devices have become known which influence the torque of the loop arm and the speed control of the main drive.
  • the belt tension is generated by the loop lifter and its position is used as a parameter for loop control.
  • control devices for main drives and loop lifter drives of broadband finishing lines, Siemens-Z. 40 (1960), p. 795 ff) the torque of the loop lifter and thus the belt tension are produced with such known devices .
  • the angular position of the loop lifter is specified by a setpoint and the torque is applied by an adjustable drive.
  • the setpoint generator can specify a sling lifter angle and thus a certain strip supply, but this strip supply is only assigned to a specific rolling line height. If the roll diameter changes, it can no longer be assumed that the rolling line height passed through between the individual stands is the same. In order to compensate for this error, shims are, as is known, placed under the roller chocks when changing the roller. If these mechanical corrections are not made, considerable tensile fluctuations could occur in the material, which could lead to large dimensional changes in the material.
  • FIG. 1 a sequence of three rolling stands 1, 2, 3 within a seven-stand continuous finishing train of a hot strip mill is shown schematically.
  • the smaller inner work rolls 5, 6 and the larger outer support rolls 7, 8 of each roll stand are mirror images of the rolling line 4.
  • a strip 9 to be rolled is raised with the aid of loop lifters 10, 11 to form so-called loops 12.
  • the slings are required to create a defined and constant band tension between the individual stands.
  • an entry table 13 is provided on the entry side of each stand, which guides the strip to be rolled exactly in front of the gap between the work rolls 5, 6.
  • the loop lifter 10 or 11 consists in principle of a torque drive 14 with a pivot point 14 'and a loop lifter arm 15 with roller 16 which presses below the band in the apex of the sling and thus raises the band.
  • An angle a is measured between the axis of the loop lifter arm 15 and a parallel to the rolling line. The angle a is the directly measurable quantity from which the actual values of strip tension and strip supply are determined.
  • An angle a 0 corresponds to a strip supply 1 of the strip located between two stands compared to the direct connection between two roll nips at an average rolling line height D. If a pair of rollers 5, 6 or 7, 8 with a different diameter is replaced by the existing one, the changed diameters result in a changed rolling line height with respect to the pivot point 14 'of the loop lifting arm 15. Thus, at constant angle a, the strip supply and strip tension would no longer be the same; the actual strip stock would be larger and the actual strip tension would be less if the rolling line was down and smaller or larger if the rolling line were shifted upwards compared to a defined mean rolling line height.
  • roller diameters are subject to considerable changes due to wear and subsequent processing.
  • the distance D between the center of rotation of the sling lifter and the rolling line is thus changed abruptly by changing the roll. Without going into this, the angle a would have been kept constant by the automatically acting electronic control unit, but the strip tension could change considerably, which would lead to malfunctions and defective products.
  • FIG. 3 shows the dependence of the belt tension factor M / Z (torque M of the loop lifter for a specific tension Z) from the angle a to explain the next conceptual step. Since the tension Z is to be kept constant, the tape tension factor and thus the torque must be corrected accordingly when D changes.
  • FIG. 4 shows a block diagram for realizing the invention.
  • the components of the control loop are shown in simplified form to clarify the principle.
  • the loop lifter arm 15 is driven by the loop lifter motor 14, which is a constantly excited DC shunt motor.
  • the armature supply of the motor 14 takes place via a power converter 19.
  • Each loop motor 14 has its own speed control with subordinate current control.
  • the actual speed value is recorded by the EMF of the motor in the computer 18 (EMF formation).
  • the EMF is formed from the armature current and armature voltage.
  • the speed controller 20 designed as an EMF controller receives a specific setpoint in addition to the EMF.
  • the controller 20 receives an addition value from the addition amplifier 21 as a limiting variable, which is composed of the signals for dead weight, strip weight and strip tension.
  • the manipulated variable i.e. H. the armature current for the motor 14 is changed via the current regulator 29.
  • the individual torque components for dead weight, strip weight and strip tension are formed in the adaptation controllers 23, 24, 25 intended for this purpose and added to a setpoint value which acts as a limitation on the controller 20.
  • the output of the EMF controller 20 is thus the setpoint for the current controller 29.
  • the setting angle a is continuously measured by a sensor 22.
  • the band weight and the dead weight of the loop lifter are taken into account as torque components, which are calculated from a, via the function generators 23, 24.
  • the setting angle a is also used as a measurement variable for loop control.
  • the respective rolling line height D is also taken into account in the control.
  • the rolling line height is determined by adding the roll diameters and possibly further variables influencing the rolling line height in the circuit 33, and is represented as a corresponding analog value U D. It is the responsibility of two downstream function generators 42, 43 to determine the electrical analog value U M / Z and U1 for the strip tension factor M / Z and the strip supply 1 as a function of the setting angle a and the fixed predetermined rolling line height D.
  • the roller motor 129 is controlled by means of the control module 28 (“speed control”) and thus the strip supply 1 is set.
  • FIG. 5 shows the part of the block diagram located in the dash-dotted box in FIG. 4.
  • the circuits 30, 31, 32 allow the manual setting of the values determined by physical measurement for the support roll diameter, work roll diameter and total thickness of the washers and deliver corresponding analog voltage values at their outputs.
  • the voltage values are added in an adding amplifier 33.
  • another adder 34 are provided as further correction g Rössen the difference in height of the run-in table and the rolling line heights of the adjacent scaffolding considered.
  • the entire correction can also be switched off via the switch 35.
  • a voltage value U D which corresponds to the currently measured rolling line height D, is accordingly present at the inputs 36 and 37 of the function generators 42 and 43.
  • Voltage values corresponding to the currently measured angle a are entered at the further inputs 38, 39.
  • the construction of the function generators 42, 43 will not be explained in detail, since their construction is familiar to a person skilled in the art if the underlying functions are known.
  • the generators are based on the following functions:
  • FIG. 6 The geometric details can be seen in FIG. 6.
  • the circuits shown in FIGS. 4 and 5 are based on the task of ensuring that the strip supply and the strip tension Z are at a predetermined desired value to keep.
  • the setpoints are of each W alz- beginning in the regulator circuits 20, fixed 27th
  • the arrangement according to the invention thus enables the change in the rolling line to be detected by using function generators which take into account both the current value for a and a set D.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Metal Rolling (AREA)
EP79101106A 1978-05-16 1979-04-11 Agencement pour traiter des changements de hauteur de la ligne de passe dans un laminoir continu Withdrawn EP0005450A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19782821396 DE2821396A1 (de) 1978-05-16 1978-05-16 Anordnung zur betriebsmaessigen erfassung der veraenderung der walzlinienhoehe bei einer walzstrasse
DE2821396 1978-05-16

Publications (2)

Publication Number Publication Date
EP0005450A2 true EP0005450A2 (fr) 1979-11-28
EP0005450A3 EP0005450A3 (fr) 1979-12-12

Family

ID=6039503

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79101106A Withdrawn EP0005450A3 (fr) 1978-05-16 1979-04-11 Agencement pour traiter des changements de hauteur de la ligne de passe dans un laminoir continu

Country Status (3)

Country Link
EP (1) EP0005450A3 (fr)
JP (1) JPS54151062A (fr)
DE (1) DE2821396A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0710513A1 (fr) * 1993-10-08 1996-05-08 Kawasaki Steel Corporation Système de réglage de tension entre les cages pour un laminoir continu
US5660066A (en) * 1993-10-08 1997-08-26 Kawasaki Steel Corporation Interstand tension controller for a continuous rolling mill
CN104148386A (zh) * 2014-07-01 2014-11-19 东北大学 一种液压张力温轧机

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105371766A (zh) * 2014-08-26 2016-03-02 无锡格瑞斯精密机械有限公司 卷缘机分段件模具的检测方法
CN111678409B (zh) * 2020-06-16 2022-03-15 玉溪中烟种子有限责任公司 一种植物株高获取装置、方法及系统

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3961510A (en) * 1975-07-11 1976-06-08 Wean United, Inc. Tension device for a rolling mill and the like
AU485520B2 (en) * 1974-04-02 1976-10-07 John Lysaght (Australia) Limited Hot strip mill tension control

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU485520B2 (en) * 1974-04-02 1976-10-07 John Lysaght (Australia) Limited Hot strip mill tension control
US3961510A (en) * 1975-07-11 1976-06-08 Wean United, Inc. Tension device for a rolling mill and the like

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, Vol. IA-9, Nr. 5, September/Oktober 1973, New York, USA, J.C. PRICE: "The hot strip mill looper system", Seiten 556-562. *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0710513A1 (fr) * 1993-10-08 1996-05-08 Kawasaki Steel Corporation Système de réglage de tension entre les cages pour un laminoir continu
US5660066A (en) * 1993-10-08 1997-08-26 Kawasaki Steel Corporation Interstand tension controller for a continuous rolling mill
CN104148386A (zh) * 2014-07-01 2014-11-19 东北大学 一种液压张力温轧机

Also Published As

Publication number Publication date
JPS54151062A (en) 1979-11-27
EP0005450A3 (fr) 1979-12-12
DE2821396A1 (de) 1979-11-29

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Inventor name: HOFFMANN, DIRK, DR.-ING.