EP2849896A1 - Verfahren zur bearbeitung von walzgut in einer walzstrasse - Google Patents
Verfahren zur bearbeitung von walzgut in einer walzstrasseInfo
- Publication number
- EP2849896A1 EP2849896A1 EP13729691.9A EP13729691A EP2849896A1 EP 2849896 A1 EP2849896 A1 EP 2849896A1 EP 13729691 A EP13729691 A EP 13729691A EP 2849896 A1 EP2849896 A1 EP 2849896A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- load torque
- rolling
- real
- drives
- drive
- 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.)
- Granted
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
- B21B37/46—Roll speed or drive motor control
-
- 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
- B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
Definitions
- the invention relates to a method for processing rolling stock in a rolling mill
- rolling stock eg steel or various metals in the form of so-called slabs or billets
- the rolling stock passes through a rolling train with several roll stands, in which it is rolled out into strips or wires in several passes.
- wire rolling mill stands which have as rollers each two superimposed caliber rolling rings with alternately circular and oval-shaped caliber on ⁇ whose cross-section decreases after each stitch.
- Round rods are made from billets with an approximately square cross-section.
- the rotational speeds of the rolls of the individual rolling stands In order to roll the rolling stock on each rolling stand to the desired thickness or the desired cross section, the rotational speeds of the rolls of the individual rolling stands must be controlled to a target value for the rotational speed.
- the individual speed setpoints and thus also a ratio of the speeds of rotation of the successive rolling stands to each other are usually given from a stitch plan.
- the predetermined speed ratio during processing In order to obtain the desired thickness or the desired cross section of the machined rolled at the end of the rolling mill, the predetermined speed ratio during processing must lichst mög ⁇ be strictly adhered to, that is, the actual values for the rotational speeds of the rolls of the successive roll stands have throughout the processing always correspond to the specified speed ratio.
- the object of the invention is to provide a method for processing rolling stock, in which the above-mentioned disadvantages are avoided.
- each rolling mill is assigned a separate drive with speed control for the at least one roller, is under application of at least one of the drives with a real load torque, for speed control the drives at least one control circuit of the drives additionally fed in dependence de ⁇ the real load torque a simulated load torque.
- each drive has a number ⁇ rotation control with a control loop in which constantly detects an actual value for the speed, compared with the setpoint for the speed and optionally adjusted to it. If a drive is subjected to a real load torque, this causes a drop in the speed and thus a reduction of the actual value for the speed.
- the speed control of the drive restores the rolls of the rolling stand to the setpoint values for the speed.
- the individual speed setpoint Values are chosen so that the rolling stock is rolled on each roll stand to a desired thickness or desired cross-section ⁇ . It is thus a speed ratio of the rollers of the successive rolling stands set to each other, which must be complied with during the processing of the rolling stock.
- the actual values of the rotational speeds of the rolls of the rolling stands must always correspond to this predetermined speed ratio.
- the speed ratio must therefore be kept constant even when occurring load torque. Since an occurring on a drive, real Lastmo ⁇ ment causes a collapse of the actual value of the speed is supplied to the speed control of the other drives whose control loop, a simulated load torque. This causes the actual value of the speed at the other drives is also reduced and the predetermined speed ratio is maintained even when a drive with a real load torque.
- the not or only with a lower real load torque acted on drives at the time of loading a drive with ei ⁇ nem real load torque, ie, for example, when tapping the rolling stock in a rolling stand, simulated in the control loop an artificial, nachge ⁇ formed load torque.
- This simulated load torque causes an almost simultaneous and synchronous collapse of the actual values of the rotational speed at each rolling mill, so that the ratio of the rotational speeds given by the target values for the rotational speed remains constant even if the actual values for the rotational speed of one or more drives deviate from the nominal values, and during the entire processing is received.
- cracking of the rolling stock, such as wire, or looping is reliably prevented.
- a real load torque when acting on at least one of the drives a real load torque, is in each case a load torque simu ⁇ lines for controlling the speed in the control circuit of the other drives to effect a synchronous speed drop at all rolling stands.
- the size of the simulated load torque is selected as a function of the real load torque such that the rotational speeds of the actuators meet the predetermined Drehierever ⁇ ratio.
- the idea of the present invention is based therefore a real, simulated, or a ge ⁇ mixed real and simulated load torque, the synchronism of the speeds and the rolling velocities of the individual roll stands also offset in time success forming the fact that by applying each drive with a corresponding load torque, it is real load is guaranteed.
- synchronicity is the preservation of the predetermined ratio of the rotational speeds and roller speeds even when changing an actual value of at least one rotational speed.
- Control circuit of the other drives supplied only one simulated load torque. If the rolling stock passes through the rolling train, the individual rolling stands are successively len Lastmoment acted upon. During the first pass in the second Walzge ⁇ Hinst then acts, for example, on the first roll stand only a real load torque and the second rolling stand, a smaller, real load torque, and it will be added on a simulated load torque in the control circuit of the speed control of the second roll stand.
- the drives of the following rolling stands in each case only a simulated load torque is ⁇ leads. There are thus complete load torques for the speed control of the individual drives, which can be composed of only a real as well as a purely simulated load torque or a combination of both.
- the simulated load moments as a function of the highest rea ⁇ len load torque when acted upon.
- passage of meh ⁇ reren drives a real load torque, which simu ⁇ profiled load moments are to be supplied to the respective control loop of the wide ⁇ ren drives determined by the highest real Lastmo ⁇ ment.
- the highest real load torque is determined in particular with a maximum selection function.
- a differential torque between the highest real load torque and the occurring at the respective mill stand real load torque is formed and supplied to the control loop of each drive as a simulated load torque for each rolling mill.
- the highest real load torque determines the sum of real and simulated load moment on each rolling stand.
- a speed ratio of the rollers of the successive determined the rolling stands on the basis of a pass schedule.
- a pass schedule With walls ⁇ ren words, so that the rolled section in each stand to a desired thickness and desired cross is rolled for each rolling mill on the basis of pass schedule a speed setpoint is determined.
- the speed setpoints of the individual rolls of a roll stand have a specific speed ratio to one another.
- he ⁇ karte speed ratio constant during the entire working of the rolling stock, is additionally in each case supplied to a simulated load torque in accordance with the present method of speed control of the drives the control circuit. So ⁇ with the speed ratio remains constant by effecting an equal speed drop on all rolling stands.
- the respectively simulated load torque is likewise calculated on the basis of a stitch plan. This is especially at the beginning of the Bear ⁇ processing of the rolled advantageous if not yet available readings.
- the respectively simulated load torque is determined on the basis of measured variables.
- a measured variable may be, for example, a load torque determined from the measurement of a real torque or torque-proportional motor currents.
- a load torque determined from the measurement of a real torque or torque-proportional motor currents.
- Tapping timing of the rolling at a rolling stand is at hand ⁇ a suitable measure such as a rolling force, a torque or a torque-generating motor current metrological recorded. It is particularly advantageous if the time of the puncture in a roll stand on the basis of Be ⁇ movement of the rolling stock is carried out by the rolling mill. In such a material tracking the tapping time is for example by means of detectors, eg. As so-called “not metal detectors" are determined. It is suitable example ⁇ , on, such as the tip of the wire that passes through the rolling stands contact the head of the rolling stock, as a measuring point to ver ⁇ .
- a further preferred variant is to determine the time of loading a drive with a real load torque using a model. This can be done, for example, mathematically by means of a movement model of the rolling stock.
- the speed of the rolled material for example, is determined to hand ⁇ a roll peripheral speed and a calculated advance.
- FIG. 2 shows a schematic representation of a control circuit for a drive of a roll stand
- FIG. 3 shows a diagram of the time course of a on a
- FIG 4 is a diagram of the temporal course of the rotational speed of a drive, which is supplied with a real load torque ge ⁇ Mäss FIG 3,
- FIG. 6 shows a diagram of the time profile of the rotational speed of a drive, which is acted upon by a simulated Lastmo ⁇ ment according to FIG 5.
- FIG 1 shows a section of a rolling mill train 2 having alseinan ⁇ of the following roll stands 4 for machining a rolled 6.
- FIG 1 are exemplary eight successive roll ⁇ scaffolding 4 shown, which, for example, a billet is rolled into wire passes through the rolling stock 6.
- Each roll stand 4 is assigned a separate drive 8, comprising a motor 10 and a gearbox 12, with speed control, which is drawn in FIG. 1 for reasons of clarity only for one rolling stand 4.
- the transmission 12 is for example a combination of a Kammwalzgetrie ⁇ be and a transmission gear.
- Each rolling stand 4 further comprises at least one roller 13, for example two Wal ⁇ zen 13, which is controlled by the respective drive 8 to a target value for the speed n So n.
- the speed control of the drive is usually ⁇ circle 14 8 ⁇ an actual value of the rotational speed n is detected continuously, with the target value of the rotational speed n n So, for example, which is determined using a pass schedule, compared and adjusted accordingly.
- FIG. 2 shows a control circuit 14 of a drive 8 according to the present invention for controlling the rotational speed n actual of the drive 8 and thus of the rollers 13 of the roll stand 4.
- the control loop 14 comprises a control device 16, such as a PI controller, with which a control difference between the Actual value of the speed n Ist and the setpoint of the speed n So n is detected and regulated. Furthermore, the control circuit 14 includes a subordinate torque control with a converter 18, which supplies the motor 10 with power and controls it to a desired operating point, and an integrator 20, which represents the moment of inertia of the drive 8 to be considered in the control.
- a control device 16 such as a PI controller
- a real load torque M LO aci engages after the converter 18 and before the integrator 20 in the control loop 14 and directly influences the actual value of the speed ni st .
- a simulated load torque M Loa ci, sim is the control circuit directly supplied to the re ⁇ gel means 16 14 in order to achieve only a small delay of the simulated load torque M Load, sim compared to the real load torque M LO aci.
- the simulated load torque M Loa ci, sim thus directly influences the torque generated in the motor 10 by the converter 18 and thus also the power supplied.
- FIG. 4 shows a collapse of the actual value of the rotational speed n actual, corresponding to the magnitude of the actual load torque M LO aci, at time T.
- Drives 8 to which no load moment or torque deviating from the real load torque M LO aci acts learn no or only a smaller decline in the speed ni st .
- the rollers of the rolling stands 4 no longer run synchronously, ie no longer in a predetermined from the pass schedule ratio of speeds.
- At least one of the drives 8 is acted upon by a drive 8 with a real load torque M LO aci as a function of the real load torque M LO aci additionally a simulated load torque M Loa d, sim supplied, as shown in FIG.
- the simulated load torque ML O BC I, sim shows a real load torque M Loa d ⁇ the time course.
- a drive 8 can act on a drive 8 only a real load torque M Loa d, a purely simulated load torque M Loa d, sim or both a real load torque M Loa d and a simu ⁇ lated load torque M Loa d, sim act.
- the simulated Lastmo ⁇ ment M loa d, sim, the simulator 14 supplied to the control loop 14 of a drive is chosen so that for each drive 8 each rolling stand 4 in response to the real load torque
- the highest real load torque M Loa c acting on a drive 8 of a rolling stand 4 determines the sum of the real load moment M LO aci and the simulated load moment M Load , sim at the further rolling stands 4.
- the real load torque M Load at the first rolling stand is greater than the real load moment M Load at the second rolling stand.
- the real load torque M Load on the first roll ⁇ scaffold is thus the highest real load torque M Load - On On ⁇ the rolled 6 meet in the second roll stand 4, a Dif ⁇ ferenz moment between the occurring on the first roll stand 4 real load torque M Load and the second Roll stand 4 on ⁇ passing real load torque M Load determined and the control loop 14 of the second rolling stand 4 as simulated load torque M Load , sim switched.
- the size of the simulated load torque M Load , sim can be ⁇ example also be determined using a stitch plan.
- simulated load torque M Load , sim from a measured variable M, such as determined from the measurement of real torques or torque proportional ⁇ nal motor currents determined load torque.
- a measuring device 22 is present.
- An actuation of a drive 8 with a real load moment M LO aci takes place, for example, when the rolling stock 6 pierces or impinges in a rolling stand 4.
- a time T of acting on a drive 8 with a real load torque M LO aci can be detected, ie based on a
- Measured variable M is determined.
- a rolling force or a Drehmo ⁇ ment is detected metrologically by means of the measuring device ⁇ 22nd
- a determination of the time T can also take place on the basis of a value determined on the rolling stock 6, for example its speed and movement through the rolling train 2.
- the simulated load torque M Loa ci, Sim is then supplied to the control ⁇ circle 14 at the time t.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP13729691.9A EP2849896B1 (de) | 2012-07-09 | 2013-06-13 | Verfahren zur bearbeitung von walzgut in einer walzstrasse |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP20120175532 EP2684623A1 (de) | 2012-07-09 | 2012-07-09 | Verfahren zur Bearbeitung von Walzgut in einer Walzstraße |
| PCT/EP2013/062208 WO2014009093A1 (de) | 2012-07-09 | 2013-06-13 | Verfahren zur bearbeitung von walzgut in einer walzstrasse |
| EP13729691.9A EP2849896B1 (de) | 2012-07-09 | 2013-06-13 | Verfahren zur bearbeitung von walzgut in einer walzstrasse |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2849896A1 true EP2849896A1 (de) | 2015-03-25 |
| EP2849896B1 EP2849896B1 (de) | 2016-12-21 |
Family
ID=48652050
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20120175532 Withdrawn EP2684623A1 (de) | 2012-07-09 | 2012-07-09 | Verfahren zur Bearbeitung von Walzgut in einer Walzstraße |
| EP13729691.9A Active EP2849896B1 (de) | 2012-07-09 | 2013-06-13 | Verfahren zur bearbeitung von walzgut in einer walzstrasse |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20120175532 Withdrawn EP2684623A1 (de) | 2012-07-09 | 2012-07-09 | Verfahren zur Bearbeitung von Walzgut in einer Walzstraße |
Country Status (3)
| Country | Link |
|---|---|
| EP (2) | EP2684623A1 (de) |
| CN (1) | CN104411419B (de) |
| WO (1) | WO2014009093A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015205691A1 (de) | 2015-03-30 | 2016-10-06 | Siemens Aktiengesellschaft | Verfahren zur Geräuschreduzierung eines elektrischen Motors |
| DE102016214715A1 (de) * | 2015-10-15 | 2017-04-20 | Sms Group Gmbh | Verfahren zum Walzen eines Walzgutes und Walzwerk |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1466642A (en) | 1919-11-25 | 1923-08-28 | Taylorwharton Iron And Steel C | Means for controlling continuous rolling mills |
| US3237071A (en) * | 1963-04-05 | 1966-02-22 | Allis Chalmers Mfg Co | Motor load distributing system for metal rolling mill |
| SE329874B (de) | 1967-06-14 | 1970-10-26 | Asea Ab | |
| GB1204335A (en) * | 1967-11-21 | 1970-09-03 | Davy & United Eng Co Ltd | Rolling mills |
| JPS60123B2 (ja) | 1978-09-21 | 1985-01-05 | 三菱電機株式会社 | 連続圧延機のサクセシブ速度制御方法 |
| JPS5691918A (en) * | 1979-12-27 | 1981-07-25 | Mitsubishi Electric Corp | Load redistribution controller for continuous rolling mill |
| US4662202A (en) * | 1985-07-23 | 1987-05-05 | Cargill, Incorporated | Low tension cascade mill speed control by current measurement with temperature compensation |
| DE4412268A1 (de) | 1994-04-09 | 1995-10-12 | Herborn & Breitenbach | Verfahren zum selbständigen bzw. automatischen Betrieb einer Steuerungs- und Regelungseinrichtung für die Ziehantriebe einer im direkten gleitlosen Ziehverfahren arbeitenden Mehrfachziehmaschine |
| DE19633213A1 (de) * | 1996-08-17 | 1998-02-19 | Schloemann Siemag Ag | Regelverfahren |
| DE19726587B4 (de) * | 1997-06-23 | 2009-07-09 | Siemens Ag | Verfahren und Einrichtung zur Verringerung bzw. Kompensation von Drehzahleinbrüchen beim Einfädeln eines Walzgutes in ein Walzgerüst |
| RU2198753C1 (ru) * | 2002-03-22 | 2003-02-20 | Общество с ограниченной ответственностью "СЛОТ" | Способ задания скоростного режима непрерывной группы прокатных клетей стана горячей прокатки металла с обеспечением минимального натяжения в межклетевых промежутках |
| DE102009050710B4 (de) | 2009-10-26 | 2016-08-04 | Sms Group Gmbh | Drahtwalzgerüst mit Einzelantrieb |
-
2012
- 2012-07-09 EP EP20120175532 patent/EP2684623A1/de not_active Withdrawn
-
2013
- 2013-06-13 WO PCT/EP2013/062208 patent/WO2014009093A1/de not_active Ceased
- 2013-06-13 EP EP13729691.9A patent/EP2849896B1/de active Active
- 2013-06-13 CN CN201380036357.9A patent/CN104411419B/zh active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2014009093A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104411419B (zh) | 2017-06-13 |
| CN104411419A (zh) | 2015-03-11 |
| EP2849896B1 (de) | 2016-12-21 |
| WO2014009093A1 (de) | 2014-01-16 |
| EP2684623A1 (de) | 2014-01-15 |
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