EP0375095A2 - Procédé et dispositif pour le réglage de la largeur de bande lors du laminage de bandes à chaud - Google Patents
Procédé et dispositif pour le réglage de la largeur de bande lors du laminage de bandes à chaud Download PDFInfo
- Publication number
- EP0375095A2 EP0375095A2 EP19890250130 EP89250130A EP0375095A2 EP 0375095 A2 EP0375095 A2 EP 0375095A2 EP 19890250130 EP19890250130 EP 19890250130 EP 89250130 A EP89250130 A EP 89250130A EP 0375095 A2 EP0375095 A2 EP 0375095A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- strip
- thickness
- stand
- width
- supply
- 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
Images
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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/165—Control of thickness, width, diameter or other transverse dimensions responsive mainly to the measured thickness of the product
-
- 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
- B21B37/22—Lateral spread control; Width control, e.g. by edge rolling
-
- 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
- B21B37/72—Rear end control; Front end control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/06—Width
-
- 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
Definitions
- the invention relates to a method and a device for regulating the strip width in hot strip rolling according to the preambles of claims 1 and 10.
- Hot strip rolling on modern continuous rolling mills is intended to set the finished geometry of the strip, which is predetermined within narrow tolerances, in addition to influencing the technological characteristics of the strip through controlled thermomechanical rolling.
- rolling mills can be equipped with strip tension control by adjusting the speed and / or loop lifters, which, in addition to a roll gap control and rolling force measurement and strip thickness measurement, enable control of the rolling mill (Iron and Steel Engineer, 9/84, pages 45-51) .
- This publication also describes in detail the functioning of a load-dependent control of the roll gap height (bearing play and stand expansion compensation) and the possibility of dispensing with loop lifters between the first stands of the finishing relay, the loop lifters being controlled by a minimum tension control due to known rolling forces and motor torques and the resulting change in speed Work rolls to be replaced.
- a measuring and control system for prefabricated squadrons is known, with which primarily the tension in the band between the stands by loop lifters and the bandwidth behind the prefabricated squadrons is measured and the tension and thus the bandwidth is to be corrected by speed control.
- the strip thickness should be neglected or optionally included as a factor in the tension calculation in order to keep the tension as constant as possible. If the tensile stress leads to a change in the sheet thickness, this should be corrected by speed and pressure control devices on the stands.
- An automatic load roll gap control or the selection of the stand tension control before the last stand is not disclosed; nor the type of tension sensor.
- the mass flows at the inlet and outlet of the finished scale are the same.
- the parameters of width, thickness, speed and weight of the strip change during the course of the method.
- the parameters can be measured directly on the rolling mill.
- the weight as a function of the rolling temperature and the type of material can only be recorded as an implicit statistical variable during rolling.
- the change in weight of approx. 0.1% during hot rolling is negligible.
- the invention takes into account the knowledge that the strip supply between the stands has to be regulated in order to achieve a stable operating state during hot rolling.
- the rolling mill If you think of the rolling mill as a controlled system, to which the control loops for the nominal guide values of speed and idle roll gap or load roll gap are assigned, you get the rolling forces, the rolling moments, the loop lifting angles, the resulting strip thickness and the exit speed as important output signals.
- the speeds of the rolls and the nip feeds are available as manipulated variables. The speeds influence the loop lifter angle and the material flow speed; the roll gap feed also influences the loop lifter angle, the material flow speed and the resulting strip thickness.
- the variation in the strength of the strip as a function of acts primarily as a disturbance variable Material type and temperature. This also includes so-called skidmarks (rail shadows) from slab heating. Irregularities in the slitting or roughing of slabs, as well as the lack of side upsetting units in the roughing mill, also cause bandwidth fluctuations.
- the existing loop control could be used by correcting the speed of the work rolls in front of or behind the loop concerned in order to correct the bandwidth by increasing or decreasing the tape tension and thus the tape supply in the loop.
- the control signals for this tape supply control are generated by a width controller, which in turn receives signals from one or more bandwidth measurements, compares the measured values with the setpoints and, if necessary, applies a signal to the tape supply controller if there are deviations from the setpoint, so that the strip tension is changed.
- the width measurement is carried out as close as possible behind the last frame, preferably with a Diode line camera, which register the strip edges as a contrast to a counter light source under the hot strip.
- the strip width is then regulated in such a way that the strip tension controller determines the strip tension before the last stitch, determined by the reaction force to a fixed deflection roller under the hot strip, and the change signal from the width regulator in such a way that the roll gap of the last stand is changed.
- the hot strip is constricted or relieved and thus becomes wider.
- a change in the width also results in a change in the thickness, at least within limits, so that the final thickness of the strip is sensibly recorded and changes in thickness are corrected using a thickness control loop on the last stand.
- the thickness controller can apply a correction signal for the necessary roll gap height to the automatic load gap control device. With this procedure, the tape supply is adjusted to the requirements in a controlled manner.
- a width measurement can also be installed in front of the penultimate frame, so that the bandwidth between the last two stitches can be controlled.
- a width measurement at both points would be ideal in order to check the result of the width correction based on the first measurement and to be able to correct it more precisely.
- the width correction can also be carried out between the first two stitch decreases or the width correction can be divided between the two sections of the finished scale mentioned, so that larger fluctuations in the width can be corrected without excessive undesired control strokes occurring.
- the usual master setpoint for the position control loop "empty roll gap" after the strip has entered the first stand is replaced by actuating signals from the individual strip supply controllers.
- the strip supply controllers then control the mass flow, arithmetically the volume flow, in the finishing line for the hot strip section with the exception of the strip end.
- the well-known automatic load gap control device replaces the strip supply control.
- a setpoint deviation or the actual value for a specific strip supply of a section of the finished scale provides either the strip tension determination or the angle measurement of the loop lift deflection.
- the regulation of the first scaffold differs from this.
- the thickness and the speed of the incoming strip can be measured - assuming the permissible assumption that there is currently a constant strip width - a mass flow equivalent.
- the roll gap can be adjusted on the first stand so that the mass flow, mathematically simplified as a product of thickness and speed, remains constant due to the backflow of the material.
- the loop control between the front stands can be replaced by tension control of the belt. This results in a relatively good flatness of the belt. This enables the use of a thickness measuring system behind the first stand and thus the additional possibility of regulating the thickness of the hot strip on the first stand.
- the method of radio transmission of strain gauge torque measurements can be used to determine the strip tension between the stands.
- the strain gauge method detects the torsional moments directly on the work roller shaft without loss. The results are then available without delay for the train calculation due to the radio transmission.
- the selection of the most suitable indicators which indicate a variation of the mass flow or band supply in front of the scaffolding, is made according to their most favorable properties with regard to the conditions: lowest investment costs, greatest control speed and best effect on the band geometry. It has proven to be advantageous to keep the sling lifter angle as constant as possible, because this prevents difficulties during adjustment that result from the non-angular force effect of the sling lifter on the belt.
- a thickness regulation supplementing the strip supply regulation can be used according to the invention.
- the actual thickness value measured with a radiation measuring device - gamma emitter cesium 137 - is fed to a thickness controller, which can optionally generate two control signals correlating to the measure of the deviation from the target thickness.
- the thickness controller then acts on the load roll gap control. In this case, however, since the roll gap control variable is used for the strip supply control, a different solution makes sense.
- a change in thickness can be recorded as a trend in the thickness measuring device behind the finishing line and thus, by changing the speed trend of the work rolls between two groups of stands in the finishing line, the strip supply can be locally increased or decreased with the effect that the strip supply regulator intervenes and the strip thickness changes.
- a correction signal - delayed to adapt to the higher control speed of the roll gap control circuit - can be sent to the roll gap controller of the stand concerned, so that the strip supply actually does not change.
- the width control by means of roll gap adjustment is included in this concept.
- the width controller mentioned at the beginning gives a signal to the belt supply controller of the last scaffolding, which then in turn changes the tension by adjusting the Roll gap and not - as in the simplest concept - the speeds of the work rolls.
- the width controller With this fast dynamic control, the width fluctuations can be corrected without the slower thickness control providing speed compensation. Otherwise the thickness controller must also receive a feedforward control.
- the last stitch acceptance must be designed in such a way that it is greater in percentage than the fluctuation in the bandwidth to be corrected.
- FIG. 1 shows the change in the specific tensile stress in the hot strip 10 over the angular position (looper angle) of a loop lifter (looper) at 4 to 10 bar fluid pressure (looper pressure) of the lifting cylinder of the loop lifter. Every change in the angle of the sling lifter causes tension fluctuations in the belt. With the tape supply control and the tape tension changes are much less than with the conventional loop control.
- Fig. 2 shows the situation on the finishing line of a rolling mill for hot strip 10 with seven rolling stands 1 ... 7, four swiveling loop lifters 12 ... 15 and a vertically adjustable and lockable deflection roller 16 with force measuring device 9.
- the drives, measuring devices and actuators are not all shown for the sake of clarity.
- Each scaffold has a belt supply controller BVR and an additional thickness controller DR is installed on the last scaffold.
- each stand also has a position controller PR and an automatic load roll gap control AGC, which receives the roll gap h currently calculated from the roll force f and the displayed position s of the rolls from a roll gap computer HR.
- All of the setpoints for the roll speeds NL are predefined by a master setpoint calculator (not shown) and, during the rolling, tend to be ramped in accordance with the desired pass schedule and the desired temperature speed-up.
- Speed controllers DNR ensure that the speeds comply with their current setpoints N 1 ... N 7.
- the setpoints of the roll gap heights SL are also specified by the master setpoint computer before the start of the roll. They have to be readjusted continuously during rolling in order to adapt to the material flow or strip supply.
- the necessary supply signals delta S are provided by the belt supply controller BVR.
- Each belt supply controller BVR gets its actual value from that in the respective scaffolding 1 ... 7 incoming piece of tape, while its setpoint SL is constant.
- the physical quantity used as the actual value is in all cases a measure of the supply of strip volume (mass supply) in front of the stand and after the previous stand.
- the belt supply controller BVR thus regulates a constant belt supply between stands 1 ... 7.
- the nominal thickness H Z is used as the target value and the current thickness h Z as the actual value. Strictly speaking, this band supply regulator BVR is only a thickness regulator. It can be controlled by the thickness h 0.
- loop lifter angles a12 ... a15 serve as the actual value for the belt supply regulator BVR. Each angle is a measure of the tape length in stock.
- the tensile force z 1 or z 6 in the incoming strip section is used as the actual value for the respective strip supply controller BVR.
- the tensile force indicates the supply of tape that is available when the material plastically deforms. With a low pulling force the stock is larger than with a large pulling force.
- the methods for determining the tensile forces z 1 and z 6 are very different for the stands 2 and 7.
- the tensile force z 1 in front of the stand 2 is determined from the measured values of the rolling force f and the torque m of the work roll shaft in the stand 1 before and after the run-in of the belt 10 in the scaffold 2 calculated in the belt tension calculator ZB.
- the torque m is determined by strain gauges, not shown, and transmitted by radio to the strip tension computer ZB.
- a deflection roller 16 equipped with a force sensor 9 is used. For this purpose, it is hydraulically moved vertically into its target position immediately after tapping the scaffold 7 and blocked there.
- the procedure for finishing a hot strip is regulated as follows: After the strip 10 has entered the stand 1, the thicknesses h 0 and h Z are determined using the thickness gauges DO, DZ and the torque m and the rolling force f or the quotient m / f. The thickness is sent to the BVR, which takes over the further regulation on scaffold 1. After the belt 10 has entered the stand 2, the measured values m and f and their quotient change. The strip tension computer ZB determines the strip tension or tensile force z 1 from the change and thus acts on the strip supply controller BVR on stand 2, which subsequently controls the load roll gap height s 2. The control takes place via the position controller PR.
- the loop lifter 12 After the stand 3 has been tapped, the loop lifter 12 is moved into the desired position; a setpoint deviation of a 12 leads to a change in the load roll gap height s 3 on the stand 3 by the BVR strip supply controller.
- the deflection roller 16 After tapping the Scaffolding 7, the deflection roller 16 is moved into the desired position, as before, and locked there.
- Force sensor 9 determines the tensile force z 6 and thus acts on the belt supply controller BVR on the scaffold 7. All belt supply regulators BVR provide a constant strip supply between the stands by possibly changing the roll gaps, with the result that the loop lifters 12 ... 15 vibrate only within narrow limits. As a result, with "correct" presetting of the strip thickness HZ, very small deviations to be corrected are achieved, which are then corrected by the very fast roll gap adjustment.
- the desired thickness tolerances behind the finished scale can be exceeded due to faults, for example as a result of temperature or thickness differences in the preliminary strip. This is determined by a final thickness measurement.
- the strip supply control is supplemented by a control of the exit thickness h E.
- the mode of operation of the thickness control with the aid of the thickness controller DR has been derived from the following consideration:
- the thickness h of the strip 10 emerging from the roll gap is obtained by dividing the entry thickness into the stand by the extension factor by which the strip length increases.
- h 0 is the entry thickness and h E the exit thicknesses, v 0 the entry speed in stand 1 and v 7 the exit speed from stand 7.
- the quotient v 0 / v 7 is the reciprocal extension factor.
- the variables h 0, v 0 and v 7 are suitable according to the equation. However, these three variables act on the exit thickness h E at different speeds in this control loop. The equation only describes the steady state equilibrium; the dynamic behavior is different.
- the entry thickness h 0 has the slowest effect on the exit thickness h E.
- the running time of the belt 10 through all the stands has a delaying effect here.
- the influence of speed v 0 is at least ten times faster.
- the thickness controller DR supplies a correction signal delta v 7, which is added positively or negatively to the speed specified by the computer via the roll speed N 7 . Instead, the temperature speed-up for frameworks 1 to 6 could be changed by the value delta v 7.
- either the product calculated from the measured values h 0 and v 0 can be regulated to a constant value by the strip supply controller of stand 1 at the entrance of the rolling mill, or it can, as in FIG. 2 shown, the product h Z x v1 can be kept constant by keeping v1 approximately constant by the speed controller of the first stand.
- the measurement of the thickness values h 0 and h Z could therefore also be replaced by the measurement of the current thickness h 0 with a thickness meter DO and the current run-in speed v 0 without changing the control principle.
- the tape supply controller BVR can of course only deliver their control signals delta s for the position controller PR as long as the tape supply indicators flow from the respective measuring sensors. If the end of the strip reaches a measuring sensor, the corresponding BVR strip supply controller must be deactivated. Then, according to the invention, the load roll gap control AGC acted upon by the rolling force takes over the further regulation of the roll gap in a manner known per se. When switching from the strip supply controller BVR to the control device AGC, the current roll gap value is accepted without bumps. From the illustration in FIG. 2 it follows that the switchover from stand 2 to AGC takes place as soon as the belt 10 leaves the stand 1, because then the belt supply controller BVR no longer receives any tension values z 1. This applies analogously to frameworks 3 to 6, since the loop lifters have to be deactivated; correspondingly, no true force effect can be measured for the scaffold 7 on the deflection roller 16.
- the width meter 11 records the bandwidth b 7 after the last stitch acceptance in the frame 7.
- the measured value is compared with the nominal width BE in the width controller BR.
- the width controller BR calculates a control signal delta Z and thus acts on the belt supply controller BVR of the stand 7. If the bandwidth b 7 is too large, the signal delta Z will result in a tension value being applied to the controller BVR with the tension tension z 6 , which then detects an excessively large supply of strip and opens the roll gap on stand 7 by the value delta S, with the result that the tensile stress in the strip is increased and the strip width is reduced.
- the control effect is faster if, as shown, a further width meter 8 in front of the scaffold 6 pre-controls the current bandwidth BR, so that width differences can be corrected locally without loss of time by swinging in the control loop.
- the process sequence on the rolling mill can be optimally controlled and the effort for loop lifters, measuring devices and control systems is kept within limits.
- Tests with this control system have shown an improvement in the band width tolerance of 20 mm and the tolerances for the band thickness h E to values of plus / minus 0.04 mm to the target thickness of 1.5 mm.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
- Metal Rolling (AREA)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19883843730 DE3843730C2 (de) | 1988-12-22 | 1988-12-22 | Verfahren und Vorrichtung zum Regeln der Bandbreite beim Warmbandwalzen |
DE19883843731 DE3843731A1 (de) | 1988-12-22 | 1988-12-22 | Verfahren und vorrichtung zum warmbandwalzen |
DE3843730 | 1988-12-22 | ||
DE3843731 | 1988-12-22 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0375095A2 true EP0375095A2 (fr) | 1990-06-27 |
EP0375095A3 EP0375095A3 (fr) | 1992-12-23 |
EP0375095B1 EP0375095B1 (fr) | 1996-01-31 |
Family
ID=25875619
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89250129A Expired - Lifetime EP0375094B1 (fr) | 1988-12-22 | 1989-12-22 | Procédé et dispositif pour le laminage de bandes à chaud |
EP89250130A Expired - Lifetime EP0375095B1 (fr) | 1988-12-22 | 1989-12-22 | Procédé et dispositif pour le réglage de la largeur de bande lors du laminage de bandes à chaud |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89250129A Expired - Lifetime EP0375094B1 (fr) | 1988-12-22 | 1989-12-22 | Procédé et dispositif pour le laminage de bandes à chaud |
Country Status (3)
Country | Link |
---|---|
EP (2) | EP0375094B1 (fr) |
AT (2) | ATE133591T1 (fr) |
DE (2) | DE58909588D1 (fr) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3216881A4 (fr) * | 2014-11-05 | 2018-07-11 | Nippon Steel & Sumitomo Metal Corporation | Procédé et dispositif de fabrication de tôle d'acier |
WO2018197579A1 (fr) * | 2017-04-25 | 2018-11-01 | Muhr Und Bender Kg | Procédé et dispositif permettant de déterminer la planéité d'un matériau en bande et installation de traitement dotée d'un tel dispositif |
CN113522996A (zh) * | 2020-04-21 | 2021-10-22 | 宝山钢铁股份有限公司 | 利用测宽仪对中厚板轧机侧导板自动标定的方法及其装置 |
CN113909307A (zh) * | 2021-08-30 | 2022-01-11 | 北京首钢自动化信息技术有限公司 | 一种活套控制方法及装置 |
US11318511B2 (en) | 2014-09-17 | 2022-05-03 | Primetals Technologies Germany Gmbh | Width setting on a finishing train |
CN114653759A (zh) * | 2022-04-01 | 2022-06-24 | 浙江水利水电学院 | 基于轧制力控制的热轧带钢宽度调节装置及方法 |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19543605A1 (de) * | 1995-11-23 | 1997-05-28 | Schloemann Siemag Ag | Verfahren zur Querschnittsregelung von Walzgut |
WO1999024184A1 (fr) * | 1997-11-07 | 1999-05-20 | Siemens Aktiengesellschaft | Procede et dispositif servant a laminer une bande de metal |
CN108568452B (zh) * | 2017-03-11 | 2020-04-28 | 深圳格林德能源集团有限公司 | 一种锂离子电池全自动闭合式三辊极片辊轧机 |
CN107030120B (zh) * | 2017-05-31 | 2018-11-09 | 南京钢铁股份有限公司 | 船用钢板厚度公差的精确控制方法 |
CN110961469B (zh) * | 2019-12-19 | 2021-04-27 | 北京首钢股份有限公司 | 一种控制带钢头部稳定性的方法及装置 |
CN113909300A (zh) * | 2021-09-26 | 2022-01-11 | 重庆钢铁股份有限公司 | 一种中厚板精轧机辊道节电控制***及方法 |
CN114951295B (zh) * | 2022-05-05 | 2023-04-07 | 福建三宝特钢有限公司 | 一种基于活套控制的切分双高棒轧制*** |
Citations (9)
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DE2249366A1 (de) * | 1971-10-11 | 1973-04-19 | Hitachi Ltd | Verfahren und vorrichtung zur kontrolle und steuerung der breite eines gewalzten bandes |
US4162624A (en) * | 1977-03-31 | 1979-07-31 | Hitachi, Ltd. | Tension control method for a rolling mill |
JPS5820313A (ja) * | 1981-07-29 | 1983-02-05 | Sumitomo Metal Ind Ltd | 圧延機の制御方法 |
JPS58192606A (ja) * | 1983-03-10 | 1983-11-10 | Ishikawajima Harima Heavy Ind Co Ltd | 圧延装置 |
JPS62192206A (ja) * | 1986-02-15 | 1987-08-22 | Nippon Steel Corp | 熱間帯鋼連続仕上圧延機のスタンド間張力制御方法及び装置 |
JPS6368207A (ja) * | 1986-09-08 | 1988-03-28 | Kobe Steel Ltd | タンデム圧延における板幅制御方法 |
JPS63203209A (ja) * | 1987-02-19 | 1988-08-23 | Sumitomo Metal Ind Ltd | 熱間連続圧延機の板幅制御方法 |
JPH01258807A (ja) * | 1988-04-05 | 1989-10-16 | Sumitomo Metal Ind Ltd | タンデムミルにおける板幅制御方法 |
DE3828495A1 (de) * | 1988-08-23 | 1990-03-01 | Betr Forsch Inst Angew Forsch | Verfahren und vorrichtung zur zugkraftregelung im walzgut zwischen walzgeruesten |
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JPS6130211A (ja) * | 1984-07-23 | 1986-02-12 | Fuji Electric Co Ltd | 多スタンド連続圧延装置の運転制御装置 |
FR2568496B1 (fr) * | 1984-08-01 | 1987-01-30 | Laminage Continu Ste Lorrai Me | Procede et dispositif de reglage du synchronisme dans un laminoir a produit plat. |
DE3637043A1 (de) * | 1986-10-30 | 1988-05-05 | Licentia Gmbh | Verfahren zum vorausbestimmten einhalten enger dickentoleranzen beim walzen von walzgut in warmbandstrassen |
-
1989
- 1989-12-22 DE DE58909588T patent/DE58909588D1/de not_active Expired - Fee Related
- 1989-12-22 AT AT89250130T patent/ATE133591T1/de not_active IP Right Cessation
- 1989-12-22 AT AT89250129T patent/ATE142916T1/de not_active IP Right Cessation
- 1989-12-22 DE DE58909734T patent/DE58909734D1/de not_active Expired - Fee Related
- 1989-12-22 EP EP89250129A patent/EP0375094B1/fr not_active Expired - Lifetime
- 1989-12-22 EP EP89250130A patent/EP0375095B1/fr not_active Expired - Lifetime
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US4162624A (en) * | 1977-03-31 | 1979-07-31 | Hitachi, Ltd. | Tension control method for a rolling mill |
JPS5820313A (ja) * | 1981-07-29 | 1983-02-05 | Sumitomo Metal Ind Ltd | 圧延機の制御方法 |
JPS58192606A (ja) * | 1983-03-10 | 1983-11-10 | Ishikawajima Harima Heavy Ind Co Ltd | 圧延装置 |
JPS62192206A (ja) * | 1986-02-15 | 1987-08-22 | Nippon Steel Corp | 熱間帯鋼連続仕上圧延機のスタンド間張力制御方法及び装置 |
JPS6368207A (ja) * | 1986-09-08 | 1988-03-28 | Kobe Steel Ltd | タンデム圧延における板幅制御方法 |
JPS63203209A (ja) * | 1987-02-19 | 1988-08-23 | Sumitomo Metal Ind Ltd | 熱間連続圧延機の板幅制御方法 |
JPH01258807A (ja) * | 1988-04-05 | 1989-10-16 | Sumitomo Metal Ind Ltd | タンデムミルにおける板幅制御方法 |
DE3828495A1 (de) * | 1988-08-23 | 1990-03-01 | Betr Forsch Inst Angew Forsch | Verfahren und vorrichtung zur zugkraftregelung im walzgut zwischen walzgeruesten |
Non-Patent Citations (6)
Title |
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PATENT ABSTRACTS OF JAPAN vol. 012, no. 039 (M-665)5. Februar 1988 & JP-A-62 192 206 ( NIPPON STEEL CORP ) 22. August 1987 * |
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Also Published As
Publication number | Publication date |
---|---|
EP0375094A3 (fr) | 1992-12-23 |
EP0375095A3 (fr) | 1992-12-23 |
DE58909734D1 (de) | 1996-10-24 |
EP0375094A2 (fr) | 1990-06-27 |
ATE133591T1 (de) | 1996-02-15 |
ATE142916T1 (de) | 1996-10-15 |
EP0375094B1 (fr) | 1996-09-18 |
EP0375095B1 (fr) | 1996-01-31 |
DE58909588D1 (de) | 1996-03-14 |
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