EP0614404B1 - Steuereinrichtung zur positionierung des gerüstoberteiles eines vier-säulen-walzgerüstes - Google Patents

Steuereinrichtung zur positionierung des gerüstoberteiles eines vier-säulen-walzgerüstes Download PDF

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Publication number
EP0614404B1
EP0614404B1 EP92924597A EP92924597A EP0614404B1 EP 0614404 B1 EP0614404 B1 EP 0614404B1 EP 92924597 A EP92924597 A EP 92924597A EP 92924597 A EP92924597 A EP 92924597A EP 0614404 B1 EP0614404 B1 EP 0614404B1
Authority
EP
European Patent Office
Prior art keywords
control system
cylinders
roll stand
value
determined
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.)
Expired - Lifetime
Application number
EP92924597A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0614404A1 (de
Inventor
Bernd Berger
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.)
Sundwiger Eisenhuette Maschinenfabrik GmbH and Co
Original Assignee
Sundwiger Eisenhuette Maschinenfabrik GmbH and Co
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 Sundwiger Eisenhuette Maschinenfabrik GmbH and Co filed Critical Sundwiger Eisenhuette Maschinenfabrik GmbH and Co
Publication of EP0614404A1 publication Critical patent/EP0614404A1/de
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Publication of EP0614404B1 publication Critical patent/EP0614404B1/de
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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
    • B21B37/58—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
    • B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
    • B21B2203/18—Rolls or rollers
    • B21B2203/187—Tilting 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
    • B21B31/02—Rolling stand frames or housings; Roll mountings ; Roll chocks
    • B21B31/04—Rolling stand frames or housings; Roll mountings ; Roll chocks with tie rods in frameless stands, e.g. prestressed tie rods
    • 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

Definitions

  • the invention relates to a four-column rolling stand with four positioning cylinders arranged opposite each other in pairs, each of which is provided with a position sensor for measuring their stroke position and each equipped with a measuring sensor for detecting the reaction force absorbed by the positioning cylinders, and with a control device for Positioning of the upper part of the scaffold, which emits a control signal for raising, lowering or pivoting the upper part of the scaffold as a function of the measured values of the position transducers, taking into account a length difference value determined from the difference in the lifting position
  • length sensors are used to check the synchronism and the alignment of the cylinder pistons.
  • the measurement signals supplied by these position sensors are generally subject to errors, so that the actual stroke position of the positioning cylinders can deviate from the measured one. Because of this deviation caused by measurement errors, there is also a danger of the upper part of the scaffolding becoming distorted if all the length values determined by the position sensors are identical.
  • Torsion of the upper part of the scaffold can also be avoided by operating one of the four adjusting cylinders under pressure control.
  • the measured actual pressure value of the adjacent cylinder can serve as the pressure setpoint for this cylinder.
  • the disadvantage of this The procedure is that the target value for the pressure-controlled adjusting cylinder is only established after the remaining three adjusting cylinders have been adjusted. This means that such control has only a reduced control dynamics.
  • the object of the invention is to provide a four-column rolling mill of the type mentioned with good control dynamics, which emits a control signal corrected by the measurement errors of the length measurement for raising, lowering or pivoting the upper part of the stand.
  • the invention is based on the finding that different forces of different forces are absorbed by the pitch cylinders when the upper frame part of the roller is twisted. An unequal stroke position leads to an unequal loading of the actuating cylinders.
  • the measurement errors of the length measurement are detected by the result of an additional force measurement, by which, for example, the Pressure values measurable reaction forces in the pitch cylinders can be determined. If the reaction forces of the cylinders of a pair of adjusting cylinders differ from one another, the control device determines a correction value from this difference, by means of which the error in the length measurement is corrected. For this purpose, the force difference is multiplied by a proportionality factor, by means of which the result of the force measurement is transferred to a length value for the stroke adjustment. In this way it is possible to compensate for the errors in the length measurement in the shortest possible time and to create a control unit with good control dynamics and stable control behavior.
  • an additional force measurement by which, for example, the Pressure values measurable reaction forces in the pitch cylinders can be determined.
  • this position reference quantity is compared with the actual position of the roller determined by linear displacement sensors and a difference value is determined from this comparison, which readjustment of the pressure of the tensioning cylinder and thus a correction of the position of the Roller causes.
  • exactly known length measurement values are thus assumed in the known roll stand. Measurement errors of the linear position sensors are not taken into account.
  • the invention makes it possible, by means of a force-dependent correction of measurement errors in the length measurement, that all actuating cylinders of a four-column rolling stand are loaded uniformly and, consequently, the upper part of the rolling stand is kept stress-free.
  • the control behavior of the control device can additionally be improved in that the control device has number memories in which the force difference values determined for an actuating process can be stored in such a way that they can be called up for determining the correction values of the subsequent actuating process. These number memories make it possible to use a control loop by which the force difference values can be determined iteratively starting with an initial value. Such a controller has an integrating behavior, by means of which an undesired abrupt adjustment of the setpoints is avoided. In addition, it makes sense if the control device has number memories in which the force difference values determined for each setting process can be summed up, and that the control device emits a warning signal when a limit value of this sum is exceeded. In this way, an improper misalignment of the upper part of the scaffold is reliably avoided.
  • the function of the position encoder can be monitored in that the control device when a Limit value for the differential amount of the reaction forces absorbed by the pitch cylinders of a pair of pitch cylinders emits a warning signal.
  • a suitable control device is characterized in that the control device emits a warning signal when a limit value for a sum formed from the addition of the difference in reaction forces determined for each pair of actuating cylinders is exceeded.
  • the four-column rolling stand has a stand upper part 5 carried by four adjusting cylinders 1, 2, 3, 4.
  • the positioning cylinders 1, 2, 3, 4, as positioning cylinder pairs A, B, are located laterally opposite one another the rolling mill 6 is arranged.
  • the pistons of the adjusting cylinders 1, 2, 3, 4 can be raised and lowered by pressurizing the adjusting cylinder space with hydraulic fluid.
  • Each of the positioning cylinders 1, 2, 3, 4 has position sensors 7, which detect the stroke position LA1, LA2, LB3, LB4 of the pistons of the positioning cylinders 1, 2, 3, 4, and force sensors 8, each of which prevails in the cylinder space Supply pressure of the hydraulic fluid proportional signal FA1, FA2, FB3, FB4 as a measure of the reaction force absorbed by the jack cylinders.
  • the position transducers 7 and force transducers 8 are connected to a control device 10 via signal lines 9.
  • Control valves (not shown) are connected to four outputs of the control device 10 via control lines 11, by adjusting the hydraulic pressure in the adjusting cylinders 1, 2, 3, 4 depending on the control signals SA1, SA2, SB3, SB4 emitted by the control device 10 for lifting, Lowering or pivoting the upper part of the scaffold 5 is changeable.
  • the control device 10 has a control circuit 12, which is shown in FIG. 2.
  • the value T of the absolute inclined position of the upper part 5 of the stand, related to the longitudinal axis I of the roll stand, is included in the control circuit 10.
  • the inclined position makes it possible to roll rolled strips with a wedge-shaped cross section in the case of a wedge-shaped roll gap.
  • Correction values k A and k B are added to the nominal values S and T with the correct sign, which can have a different value for the pairs of adjusting cylinders A, B.
  • n CA n-1 -f * (FA1-FA2) certainly.
  • f is a proportionality factor, which corresponds to a fraction of the torsional stiffness of the framework part 5.
  • FA1 and FA2 denote the force absorbed by the adjusting cylinders 1, 2 and CA n-1 the length difference value which was determined for the preceding setting process and which was stored in a number memory of the control device.
  • this value CA o can be set to zero in the first setting step.
  • FB3 and FB4 denote the force absorbed by the adjusting cylinders 3, 4 and CB n-1 the length difference value which was determined for the preceding actuating process and was stored in a number memory of the control device.
  • the iterative determination of the length difference values CA, CB described above has the advantage that the position of the setting cylinders 1, 2, 3, 4 is not abruptly corrected in one step, but the position of the setting cylinders is adjusted to the best possible position in several successive steps .
  • n : CA n-1 -f * (FA1-FA2-FB3 + FB4) / 4
  • CB n : CB n-1 + f * (FA1-FA2-FB3 + FB4) / 4
  • the control device emits a warning signal as a sign of the danger of an inadmissible inclination of the upper part 5 of the roll stand, which is related to the transverse axis II of the roll stand, if the sums of the correction values CA, CB of all adjusting processes also stored in a number memory exceed a maximum value.
  • a third warning signal is emitted by the control device when the sum of the difference in reaction forces FA1, FA2 or FB3, FB4 determined for each pair of actuating cylinders A, B according to the equation ABS ( FA1-FA2 + FB1-FB2 ) exceeds a maximum permissible limit.
  • This warning signal is a sign that the function of the force transducer 8 must be checked.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
EP92924597A 1991-11-25 1992-11-19 Steuereinrichtung zur positionierung des gerüstoberteiles eines vier-säulen-walzgerüstes Expired - Lifetime EP0614404B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19914138639 DE4138639C1 (enrdf_load_stackoverflow) 1991-11-25 1991-11-25
DE4138639 1991-11-25
PCT/EP1992/002659 WO1993010921A1 (de) 1991-11-25 1992-11-19 Steuereinrichtung zur positionierung des gerüstoberteiles eines vier-säulen-walzgerüstes

Publications (2)

Publication Number Publication Date
EP0614404A1 EP0614404A1 (de) 1994-09-14
EP0614404B1 true EP0614404B1 (de) 1995-07-19

Family

ID=6445487

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92924597A Expired - Lifetime EP0614404B1 (de) 1991-11-25 1992-11-19 Steuereinrichtung zur positionierung des gerüstoberteiles eines vier-säulen-walzgerüstes

Country Status (4)

Country Link
EP (1) EP0614404B1 (enrdf_load_stackoverflow)
JP (1) JPH08500293A (enrdf_load_stackoverflow)
DE (1) DE4138639C1 (enrdf_load_stackoverflow)
WO (1) WO1993010921A1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990062529A (ko) * 1997-11-11 1999-07-26 마스다 노부유키 하우징리스 압연기

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2374101A1 (fr) * 1976-12-17 1978-07-13 Secim Cage pour train continu de laminage de profiles
DE8403103U1 (de) * 1984-02-03 1984-07-05 Sundwiger Eisenhütte Maschinenfabrik Grah & Co, 5870 Hemer Vielwalzen-Walzgerüst
DE3806063C2 (de) * 1988-02-26 1996-10-17 Schloemann Siemag Ag Verfahren und Vorrichtung zur Steg- und Flanschdickenregelung in Universalgerüsten

Also Published As

Publication number Publication date
DE4138639C1 (enrdf_load_stackoverflow) 1993-02-25
JPH08500293A (ja) 1996-01-16
EP0614404A1 (de) 1994-09-14
WO1993010921A1 (de) 1993-06-10

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