WO1998019802A1 - Verfahren und einrichtung zur dynamischen einstellung des walzspaltes bei einem walzgerüst einer mehrgerüstigen walzstrasse - Google Patents
Verfahren und einrichtung zur dynamischen einstellung des walzspaltes bei einem walzgerüst einer mehrgerüstigen walzstrasse Download PDFInfo
- Publication number
- WO1998019802A1 WO1998019802A1 PCT/DE1997/002473 DE9702473W WO9819802A1 WO 1998019802 A1 WO1998019802 A1 WO 1998019802A1 DE 9702473 W DE9702473 W DE 9702473W WO 9819802 A1 WO9819802 A1 WO 9819802A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- roll
- strip
- roll gap
- loop
- stand
- Prior art date
Links
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
-
- 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
Definitions
- the invention relates to a method and a device for dynamically adjusting the roll gap in a roll stand of a multi-stand rolling mill.
- mass flow disturbances due to the thickness control i.e.
- mass flow disturbances of the first type which are only important at the strip head
- mass flow disturbances of the second type can occur across the entire band due to the divergence effects that occur.
- the AGC algorithm is based on a positive feedback behavior in the manner of a geometric series. Normally, the row converges so that the line-of-sight position changes to a new stationary end value after a load roll gap fault.
- the series can diverge for the duration of static friction in the stand window, so that the AGC algorithm then diverged until the static friction broke loose and considerable mass flow disturbances of the second kind result.
- the thickness control is generally set relatively slowly in order to always be on the safe side. Since the permissible mass flow disruption is different for each belt and scaffold depending on the schedule, it depends on numerous influences, but is unknown in terms of size. promiss with most tapes a considerable part of the actually possible control speed is not used.
- the object of the invention is to provide a method and a device for carrying out the method which avoid the above-mentioned disadvantages of the known methods and devices.
- the object is achieved according to the invention by a method according to claim 1 or a device according to claim 12.
- the inventive method and the inventive device for dynamic adjustment of the roll gap in a roll stand of a multi-stand rolling mill for rolling a strip, a strip supply, ie a loop, between two roll stands being set and limited by a loop or strip supply control the dynamics of the setting of the roll gap is limited depending on the state variables of the loop or strip supply control.
- Such a method has proven to be particularly suitable for avoiding the disadvantages mentioned above.
- This inventive solution is also superior to a purely limitation as a function of state variables of the rolling mill, as disclosed, for example, by EP 0 680 021 A1, or to a limitation according to DE 195 11 267 Cl.
- the limitation of the dynamics when setting the roll gap is advantageously carried out by limiting the speed at which the setting development of the roll gap takes place. It has proven to be advantageous to carry out the speed limitation when reducing the roll gap independently of the speed limit when enlarging the roll gap.
- the setting of the roll gap of roll stands of a multi-stand rolling mill is usually carried out by means of strip thickness controllers, which set the setpoint for the roll gap as a function of the control deviation of the thickness controller, i.e. determine the difference between a specified target strip thickness and the actual strip thickness.
- the value of the control deviation before input into the strip thickness controller is advantageously limited depending on the state variables of the loop or strip supply control.
- the roll gap is set according to a setpoint for the roll gap by means of a hydraulic roll gap control (HGC), the rate of change of the so-called HGC additional setpoint being limited according to FIG. 1 or an equivalent variable.
- HGC hydraulic roll gap control
- the roll gap is adjusted by means of a motor-controlled roll gap control (MGC), the so-called equivalent thickness control deviation according to FIG. 2 or an equivalent size being limited.
- MMC motor-controlled roll gap control
- Both the limitation of the additional HGC setpoint in the case of hydraulic roll gap control and the limitation of the equivalent thickness control deviation in the case of motorized roll gap control have proven to be particularly suitable for limiting the speed when setting the roll gap.
- the dynamics or the speed of the setting of the roll gap are limited as a function of at least one of the sizes - Strip stock in front of the roll stand or an equivalent size
- Adjustment speed when the roll gap is enlarged depending on the control deviation i.e. limit the difference between the setpoint and actual value, the sling height or the strip supply in front of and behind the roll stand.
- FIG. 1 shows a limitation according to the invention of the setting speed of the roll gap in the case of hydraulic roll gap control
- FIG. 2 shows a limitation of the setting speed of the roll gap in the case of motor-driven roll gap control
- FIG. 3 shows a diagram for defining the membership function
- FIG. 4 shows the principle of a hydraulic roll gap control
- FIG. 5 shows the principle of a motorized roll gap control.
- FIG. 1 and 2 show two expedient exemplary embodiments for limiting the intermediate variable in a hydraulic roll gap control (HGC) and a motorized roll gap control (MGC). In the latter case, a corresponding intervention in the thickness control must take place separately.
- HGC hydraulic roll gap control
- MMC motorized roll gap control
- reference numerals 1, 2, 3, 4, 5 and 6 denote membership functions
- the membership functions 1, 2, 3, 4, 5 and 6 as well as the minimum formers 10, 11 are part of a fuzzy system for forming reduction factors k aUf and k zu for the speed limitation when enlarging and reducing the roll gap.
- Loop lifters 20 and 21 are arranged between the roll stands 7, 8, 9 and maintain a predetermined tension in the rolled strip 22.
- the strip supply s which is equivalent to the angle of attack of the sling lifter, is increased or decreased.
- s x _ ⁇ denotes the strip supply between roll stands 7 and 8, ie in front of roll stand x and s x the strip supply between roll stands 8 and 9, ie behind roll stand x.
- s * x - ⁇ denotes the nominal strip stock between roll stand 7 and roll stand 8 and s * x the nominal strip stock between roll stand 8 and roll stand 9. According to FIG.
- the output variables of the membership functions are the affiliations iii, m 2 , ⁇ r ⁇ 3 , m 4 . Furthermore, the membership functions 5 and 6 form affiliations x and m F from the armature current of the main drive i A , x and the rolling force F W / X on the roll stand x.
- the affiliations m,., M F , m and m 3 are supplied to the minimum former 10 and the affiliations ⁇ ii and m 4 to the minimum former 11.
- the minimum formers 10 and 11 act as defuzzifiers.
- the membership function 6, with which the rolling force F ", x is received, represents an optional additional extension. In this way, the function of the overload protection can be implemented particularly advantageously.
- the membership function 5, with which the main drive current i A , x is received, also represents an optional extension.
- this membership function 5 the load redistribution between successive scaffolds, which is carried out regularly in the case of limit dimensions with a view to reaching main drive current limits, can be automatically secured .
- the rate of change standardized, influencing the actuating speed of the employment system is set in accordance with feedback-based worst-case considerations so that the intermediate size is adapted in the sense of accompanying measures to the changes in mass flow that are obviously still to be handled by the loop control.
- Such an intermediate variable influencing the actuating speed of the setting system can be, for example, the additional AGC setpoint h ⁇ in the case of the two-loop AGC or the additional AGC setpoint ds " A for the HGC, as in FIG.
- the basic consideration in the design of the membership functions is that the direction of action of changes in employment on the tape supply of the neighboring loops can have an improving or a deteriorating tendency depending on the sign of the tape supply control deviation.
- the reduction factor can then remain at one, ie without effect. If the tendency deteriorates, the currently permitted travel speed in the corresponding direction is reduced. However, this does not mean that the limit is also reached, since AGC and thickness control initially work independently of this intervention.
- the loop-controlled dynamic limitation by means of the limits that is to say the reduction factors K aU f and K too, is only a flanking measure. By reducing the travel speed, the loop causing this is provided with the prerequisites for rapid tape supply correction.
- 3 shows a possible and advantageous method for defining the membership functions from FIGS. 1 and 2. The following indices apply in FIG. 3:
- the maximum value for a positive ⁇ s is s * because the minimum value for s is zero (tight band in passline, i.e. zero stock).
- Negative values of ⁇ s can reach significantly higher amounts than s *, so that the criteria of the accompanying measures need to be less stringent here. That is why the membership function is more expansive to the left. Ie the zero crossing of the slope is not limited to a maximum of s *, but, as assumed in the picture, can be extracted, for example, to (-2) • s *.
- the ordinate intersection is 1.0.
- K irU 1.0 -. ⁇ s for i and m 3 J f- u . q fc> *
- S 4 shows the principle of a hydraulic roll gap control for setting a roll gap h in a roll stand 31.
- the rolling force F is first measured and then fed to a load roll gap compensation circuit 30 (AGC).
- AGC load roll gap compensation circuit 30
- the output variable of this circuit 30 is ds * , A.
- the sum s * of this additional AGC setpoint ds * , A , the additional setpoint for the roll gap ds * determined by the strip thickness control and the basic position setpoint s victim ⁇ 0 is the input variable for an HGC position control circuit 32 which defines the position s H for the roll stand 31 sets.
- the increases or rate of change of ds * A , ds * , or the sum of ds ⁇ A , ds * and s * , # 0 be limited.
- FIG. 5 schematically shows a motor-controlled roll gap control for setting the roll gap h in a roll stand 34.
- the rolling force F in the roll stand 34 is measured and together with the basic position setpoint S * , 0 and an additional setpoint ds * , for, determined by a strip thickness control the roll gap h is fed to a motorized roll gap control 33.
- Output variable of the motorized roll gap control 33 is
- an attack speed target value SM which is the input variable of a controlled motor 35.
- the output variable of the controlled motor is a setting position s M.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19781238T DE19781238D2 (de) | 1996-11-04 | 1997-10-23 | Verfahren und Einrichtung zur dynamischen Einstellung des Walzspaltes bei einem Walzgerüst einer mehrgerüstigen Walzstraße |
AT0911697A AT410905B (de) | 1996-11-04 | 1997-10-23 | Verfahren und einrichtung zur dynamischen einstellung des walzspaltes bei einem walzgerüst einer mehrgerüsteten walzstrasse |
US09/308,102 US6176112B1 (en) | 1996-11-04 | 1997-10-23 | Method and device for dynamic adjustment of the roll gap in a roll stand of a mill train having multiple stands |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19645420A DE19645420C1 (de) | 1996-11-04 | 1996-11-04 | Verfahren und Einrichtung zur dynamischen Einstellung des Walzspaltes bei einem Walzgerüst einer mehrgerüstigen Walzstraße |
DE19645420.4 | 1996-11-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998019802A1 true WO1998019802A1 (de) | 1998-05-14 |
Family
ID=7810609
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1997/002473 WO1998019802A1 (de) | 1996-11-04 | 1997-10-23 | Verfahren und einrichtung zur dynamischen einstellung des walzspaltes bei einem walzgerüst einer mehrgerüstigen walzstrasse |
Country Status (4)
Country | Link |
---|---|
US (1) | US6176112B1 (de) |
AT (1) | AT410905B (de) |
DE (2) | DE19645420C1 (de) |
WO (1) | WO1998019802A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6708077B2 (en) * | 2002-08-16 | 2004-03-16 | General Electric Company | Furnace pacing for multistrand mill |
US6839605B2 (en) * | 2002-11-20 | 2005-01-04 | Posco Co., Ltd. | Apparatus and method for diagnosing faults in hot strip finishing rolling |
DE102007050891A1 (de) * | 2007-10-24 | 2009-04-30 | Siemens Ag | Auf der Streuung einer Istgröße eines Walzguts basierende Adaptierung eines Reglers in einem Walzwerk |
CN101934289B (zh) * | 2009-06-30 | 2013-12-25 | 上海宝信软件股份有限公司 | 不锈钢冷连轧辊缝调整方法 |
CN104668294A (zh) * | 2013-11-28 | 2015-06-03 | 上海梅山钢铁股份有限公司 | 一种动态等厚度比楔形控制法 |
EP3231522B1 (de) * | 2016-04-14 | 2019-03-27 | Primetals Technologies Germany GmbH | Robuste bandzugregelung |
CN107363104B (zh) * | 2016-05-12 | 2019-01-08 | 鞍钢股份有限公司 | 一种热连轧带钢精轧辊缝调节过程辊缝学习系数修正方法 |
Citations (7)
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FR2568496A1 (fr) * | 1984-08-01 | 1986-02-07 | Laminage Continu Ste Lorrai Me | Procede et dispositif de reglage du synchronisme dans un laminoir a produit plat. |
JPS6240925A (ja) * | 1985-08-16 | 1987-02-21 | Kobe Steel Ltd | 板厚制御方法 |
JPS6415211A (en) * | 1987-07-06 | 1989-01-19 | Sumitomo Metal Ind | Method for controlling screw down in rolling mill |
JPH01317612A (ja) * | 1988-06-16 | 1989-12-22 | Nippon Steel Corp | タンデム圧延機の板厚制御方法 |
JPH05208207A (ja) * | 1992-01-31 | 1993-08-20 | Nippon Steel Corp | 熱延プロセス制御方法 |
EP0618021A1 (de) * | 1993-03-29 | 1994-10-05 | Siemens Aktiengesellschaft | Verfahren und Anordnung zur hydraulischen Walzspaltregelung |
DE19511267C1 (de) * | 1995-03-27 | 1996-04-18 | Siemens Ag | Vorrichtung zur Drehzahlregelung in einer schlingengeregelten Walzstraße |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE622548A (de) * | 1961-09-19 | |||
GB2134669B (en) * | 1983-02-08 | 1986-07-02 | Davy Mckee | Rolling mill operation |
DE3442313A1 (de) * | 1984-11-20 | 1986-05-28 | Sundwiger Eisenhütte Maschinenfabrik Grah & Co, 5870 Hemer | Walzdruckregelung beim nachwalzen (dressieren) |
US4909055A (en) * | 1988-07-11 | 1990-03-20 | Blazevic David T | Apparatus and method for dynamic high tension rolling in hot strip mills |
US5101650A (en) * | 1990-05-01 | 1992-04-07 | Allegheny Ludlum Corporation | Tandem mill feed forward gage control with speed ratio error compensation |
JP3136183B2 (ja) * | 1992-01-20 | 2001-02-19 | 株式会社日立製作所 | 制御方法 |
JPH05200420A (ja) * | 1992-01-28 | 1993-08-10 | Toshiba Corp | マットロール圧延用板厚制御装置 |
US5341663A (en) * | 1992-04-22 | 1994-08-30 | Aluminum Company Of America | Automatic process control and noise suppression |
JP3041135B2 (ja) * | 1992-06-19 | 2000-05-15 | 株式会社東芝 | 連続熱間圧延機の制御装置 |
US5787746A (en) * | 1994-07-25 | 1998-08-04 | Alcan Aluminum Corporation | Multi-stand hot rolling mill tension and strip temperature multivariable controller |
-
1996
- 1996-11-04 DE DE19645420A patent/DE19645420C1/de not_active Expired - Fee Related
-
1997
- 1997-10-23 WO PCT/DE1997/002473 patent/WO1998019802A1/de active Application Filing
- 1997-10-23 AT AT0911697A patent/AT410905B/de not_active IP Right Cessation
- 1997-10-23 DE DE19781238T patent/DE19781238D2/de not_active Ceased
- 1997-10-23 US US09/308,102 patent/US6176112B1/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2568496A1 (fr) * | 1984-08-01 | 1986-02-07 | Laminage Continu Ste Lorrai Me | Procede et dispositif de reglage du synchronisme dans un laminoir a produit plat. |
JPS6240925A (ja) * | 1985-08-16 | 1987-02-21 | Kobe Steel Ltd | 板厚制御方法 |
JPS6415211A (en) * | 1987-07-06 | 1989-01-19 | Sumitomo Metal Ind | Method for controlling screw down in rolling mill |
JPH01317612A (ja) * | 1988-06-16 | 1989-12-22 | Nippon Steel Corp | タンデム圧延機の板厚制御方法 |
JPH05208207A (ja) * | 1992-01-31 | 1993-08-20 | Nippon Steel Corp | 熱延プロセス制御方法 |
EP0618021A1 (de) * | 1993-03-29 | 1994-10-05 | Siemens Aktiengesellschaft | Verfahren und Anordnung zur hydraulischen Walzspaltregelung |
DE19511267C1 (de) * | 1995-03-27 | 1996-04-18 | Siemens Ag | Vorrichtung zur Drehzahlregelung in einer schlingengeregelten Walzstraße |
Non-Patent Citations (7)
Title |
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DUYSTERS S ET AL: "DYNAMIC MODELLING OF THE FINISHING TRAIN OF HOOGOVENS' HOT STRIP MILL AND OPTIMIZATION OF THICKNESS CONTROL PARAMETERS", JOURNAL A, vol. 31, no. 4, 1 December 1990 (1990-12-01), pages 8 - 15, XP000178686 * |
KAZUYOSHI KIMURA: "ADVANCED GAUGE CONTROL TECHNOLOGY FOR HOT STRIP MILL", TETSU TO HAGANE: JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN, vol. 79, no. 3, 1 January 1993 (1993-01-01), pages 352 - 359, XP000367851 * |
PATENT ABSTRACTS OF JAPAN vol. 011, no. 225 (M - 609) 22 July 1987 (1987-07-22) * |
PATENT ABSTRACTS OF JAPAN vol. 013, no. 189 (M - 821) 8 May 1989 (1989-05-08) * |
PATENT ABSTRACTS OF JAPAN vol. 014, no. 119 (M - 0945) 6 March 1990 (1990-03-06) * |
PATENT ABSTRACTS OF JAPAN vol. 017, no. 645 (M - 1517) 30 November 1993 (1993-11-30) * |
RIGLER G W ET AL: "IMPROVED ROLLING MILL AUTOMATION BY MEANS OF ADVANCED CONTROL TECHNIQUES AND DYNAMIC SIMULATION", IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, vol. 32, no. 3, 1 May 1996 (1996-05-01), pages 599 - 607, XP000598112 * |
Also Published As
Publication number | Publication date |
---|---|
DE19645420C1 (de) | 1998-02-12 |
DE19781238D2 (de) | 1999-09-23 |
US6176112B1 (en) | 2001-01-23 |
ATA911697A (de) | 2003-01-15 |
AT410905B (de) | 2003-08-25 |
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