EP3713686B2 - Dispositif servant à commander un laminoir étireur-réducteur - Google Patents

Dispositif servant à commander un laminoir étireur-réducteur

Info

Publication number
EP3713686B2
EP3713686B2 EP18807600.4A EP18807600A EP3713686B2 EP 3713686 B2 EP3713686 B2 EP 3713686B2 EP 18807600 A EP18807600 A EP 18807600A EP 3713686 B2 EP3713686 B2 EP 3713686B2
Authority
EP
European Patent Office
Prior art keywords
wall thickness
tube
motors
rotational speed
stretch
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.)
Active
Application number
EP18807600.4A
Other languages
German (de)
English (en)
Other versions
EP3713686B1 (fr
EP3713686A1 (fr
Inventor
Alexander Gohr
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.)
SMS Group GmbH
Original Assignee
SMS Group GmbH
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
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Application filed by SMS Group GmbH filed Critical SMS Group GmbH
Publication of EP3713686A1 publication Critical patent/EP3713686A1/fr
Publication of EP3713686B1 publication Critical patent/EP3713686B1/fr
Application granted granted Critical
Publication of EP3713686B2 publication Critical patent/EP3713686B2/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • B21B37/78—Control of tube rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/14—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling without mandrel, e.g. stretch-reducing mills
    • 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
    • B21B2261/10—Cross-sectional area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/04—Roll speed
    • 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

Definitions

  • the invention relates to a method for controlling a stretch-reducing rolling mill.
  • the tube wall thickness thickens or increases at the tube ends compared to the middle section. This occurs because the longitudinal rolling tension otherwise achieved in the middle section of the tube cannot be achieved at the front or rear end of the tube due to the lack of rolling stands upstream or downstream in the conveying direction.
  • the resulting thickened tube sections exceeding the permissible wall thickness tolerance represent a yield loss and must be cut off.
  • the mother tubes or hollows used may have upset wall thicknesses at the ends, e.g., due to tool wear in the pre-rolling units. This upset of the mother tubes causes an additional thickening of the finished tube ends.
  • End loss control has achieved practical and widespread significance by dynamically varying the motor or roll speeds as the pipe ends pass through the rolling mill. This increases the speed ratio between the rolling passes closest to the pipe end, thus increasing the rolling tension.
  • the particular challenge lies, on the one hand, in initiating the aforementioned speed changes in a timely manner, as otherwise they have no effect on the end thickening.
  • the magnitude of the speed change and the transition to the steady-state speeds must be precisely coordinated, as otherwise the sections adjacent to the pipe ends may exhibit unacceptable undershoots of the target wall thickness.
  • the situation is further complicated by the fact that the speed curves of up to 32 drive motors must be adjusted. It is not possible to determine theoretical speed profiles in advance that would achieve the best possible shortening of the thickened ends without further adjustment. However, for the operating crews, manually adjusting the speed profiles is a difficult and time-consuming process.
  • the JP H0724614 A describes an automatic adjustment of motor speeds based on pipe measurement data.
  • a method for controlling a stretch-reducing mill is disclosed, wherein pipe ends of stretched pipes are optimized by controlling one or more motors of the stretch-reducing mill, comprising at least one outlet-side wall thickness measurement and an automatic adjustment of the magnitude of a speed change of the motors to the pipe wall thickness profile.
  • the operating times and the duration of the effect are not adjusted. Both, however, have a significant influence on the control result.
  • the influence of the incoming pipe is not taken into account.
  • a combination of multiple rolling processes to minimize the influence of measurement errors or outliers is not mentioned.
  • DE-A1-38 19 571 Describes a method for controlling wall thickness during pipe stretch reduction. Changing the speeds in such a way that the time course of the speed changes of individual or all motors is automatically adjusted based on the pipe wall thickness measurements is not provided.
  • a CEC In automatic operation, a CEC independently monitors and evaluates the achieved wall thickness results at the pipe ends and readjusts the strength and timing of the speed change at the pipe ends for the following pipes.
  • the temporal progression of the speeds is characterized by the start time of the speed change and the end time of the speed change. It is provided that the temporal progression is characterized by a start time or end time and a rate of change.
  • the evaluation of the wall thickness profile is carried out on at least three sections of the wall thickness profile.
  • the method is combined with a wall thickness control system for automatically controlling the wall thicknesses outside the thickened ends.
  • the wall thickness curves at the ends are examined for cyclic patterns, whereby such patterns are taken into account in the control of the motors.
  • a measurement of an incoming shell wall thickness profile can be performed, with the magnitude and temporal progression of the speed changes of the tube end control being adapted to the shell wall thickness measurements. In this way, intervention is made very early in the forming process of a shell into a tube as the final product with the aim of improving the tube end diameter.
  • the wall thickness curves at the ends of the shells can be examined for cyclic patterns and such patterns can be taken into account.
  • the method is combined with a wall thickness control system for automatically controlling the wall thicknesses outside the thickened ends.
  • a further measure improving the invention is automatic puncture detection.
  • a further measure improving the invention consists in taking into account the actual wall thickness profiles at the ends of the incoming mother pipes.
  • a further measure improving the invention consists in specifying nominal or ideal shapes of the pipe ends of each dimension.
  • a further measure improving the invention consists in the use of pattern recognition algorithms to evaluate the wall thickness profile of each pipe end.
  • a further measure improving the invention consists in a simulation to calculate in advance the effect of a change in setting.
  • a further measure improving the invention consists in an iteration of the CEC setting over several loops to find a stable optimum
  • FIG. 1 shows a schematic representation of a stretch-reducing mill with its control system.
  • a stretch-reducing mill comprises several rolls in rolling stands 1, which are driven by variable-speed motors. Stretch-reducing of a rolled stock 2 is achieved by controlling the motors at different speeds, so that the rolled stock is subjected to tensile stress between the rolls.
  • the motors are supplied with electrical power via a programmable logic controller (PLC) 3.
  • PLC programmable logic controller
  • the PLC 3 queries and/or calculates the motor speeds during the rolling process.
  • the PLC 3 is connected to sensors 5, 6 via a network 4 in the form of a fieldbus system, so that measured values flow directly into the PLC.
  • Sensors 5 are, in this case, exemplary position sensors, for example, in the form of light barriers.
  • Sensors 6 determine additional measured values for monitoring the rolling process, in particular the diameter, wall thickness, and temperature of the rolled material.
  • the PLC 3 can also communicate with a process control computer 7a of a process control level via a non-real-time capable network 7.
  • a method according to the invention for controlling a stretch-reducing mill can be carried out on a plug-in reducing mill described above as an example. Pipe ends of stretched tubes is optimized by controlling one or more motors of the stretch-reducing mill.
  • At least one wall thickness measurement is performed on the outlet side by sensors 6, and the magnitude of a speed change of the motors is automatically adjusted to the measured pipe wall thickness profile.
  • the temporal progression of the speed changes of individual or all motors is also automatically adjusted based on the pipe wall thickness measurements.
  • the temporal progression of the speeds is characterized by the start time of the speed change and the end point of the speed change.
  • the temporal progression is also characterized by a rate of change of the speeds.
  • An assessment of the wall thickness profile is carried out on at least three sections of the wall thickness profile.
  • the wall thickness progression is evaluated based on several target variables.
  • the process for controlling the pipe end thickness is combined with a wall thickness control system for automatically controlling the wall thicknesses outside the thickened ends.
  • the measured values from the sensors 6 are analyzed by means of programs, whereby the wall thickness curves at the ends are examined for cyclic patterns and such patterns are taken into account when controlling the motors.
  • a measurement of an incoming shell wall thickness profile is carried out, whereby the sizes and the temporal courses of the speed changes of the pipe end control are adapted to the shell wall thickness measured values.
  • the wall thickness curves at the ends of the shells are examined for cyclic patterns and such patterns are taken into account.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Claims (7)

  1. Procédé de commande d'un laminoir étireur-réducteur, dans lequel les extrémités des tubes étirés sont optimisées par la commande d'un ou de plusieurs moteurs du laminoir étireur-réducteur (1), comprenant au moins une mesure de l'épaisseur de la paroi côté sortie et une adaptation automatique de la grandeur d'une variation de la vitesse des moteurs au profil d'épaisseur de la paroi du tube,
    dans lequel l'évolution dans le temps des variations de vitesse de certains ou de tous les moteurs est également adaptée automatiquement sur la base des valeurs de mesure de l'épaisseur de la paroi du tube,
    l'évolution dans le temps des vitesses de rotation étant caractérisée par l'instant de début de la variation de la vitesse de rotation et par l'instant de fin de la variation de la vitesse de rotation,
    l'évolution dans le temps étant caractérisée par l'instant de début ou l'instant de fin et un taux de variation, et les variations de l'épaisseur de la paroi aux extrémités est examinée pour déceler des modèles cycliques et que de tels modèles sont pris en compte lors de la commande des moteurs.
  2. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'évaluation de la variation de l'épaisseur de la paroi est effectuée sur au moins trois sections du profil d'épaisseur de la paroi.
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'évaluation de la variation de l'épaisseur de la paroi est effectuée à partir de plusieurs grandeurs cibles.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que le procédé est combiné avec un système de contrôle de l'épaisseur de la paroi pour contrôler automatiquement l'épaisseur de la paroi en dehors des extrémités épaissies.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'une mesure d'un profil d'épaisseur de paroi de loupe en entrée est effectuée, les grandeurs et les évolutions dans le temps des variations de vitesse de la commande d'extrémité de tube étant adaptées aux valeurs de mesure de l'épaisseur de paroi de loupe.
  6. Procédé selon la revendication 5, caractérisé en ce que les variations de l'épaisseur de paroi aux extrémités des loupes sont examinées pour déceler des modèles cycliques et que de tels modèles sont pris en compte.
  7. Procédé selon l'une des revendications 5 ou 6, caractérisé en ce que le procédé est combiné avec un système de contrôle de l'épaisseur des parois pour contrôler automatiquement l'épaisseur des parois en dehors des extrémités épaissies.
EP18807600.4A 2017-11-21 2018-11-20 Dispositif servant à commander un laminoir étireur-réducteur Active EP3713686B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017220750.7A DE102017220750A1 (de) 2017-11-21 2017-11-21 Vorrichtung zur Steuerung eines Streckreduzierwalzwerks
PCT/EP2018/081896 WO2019101727A1 (fr) 2017-11-21 2018-11-20 Dispositif servant à commander un laminoir étireur-réducteur

Publications (3)

Publication Number Publication Date
EP3713686A1 EP3713686A1 (fr) 2020-09-30
EP3713686B1 EP3713686B1 (fr) 2022-10-05
EP3713686B2 true EP3713686B2 (fr) 2025-09-17

Family

ID=64453488

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18807600.4A Active EP3713686B2 (fr) 2017-11-21 2018-11-20 Dispositif servant à commander un laminoir étireur-réducteur

Country Status (8)

Country Link
US (1) US11602779B2 (fr)
EP (1) EP3713686B2 (fr)
CN (1) CN111372694A (fr)
DE (1) DE102017220750A1 (fr)
ES (1) ES2934481T3 (fr)
MX (1) MX2020005173A (fr)
RU (1) RU2748571C1 (fr)
WO (1) WO2019101727A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018217378B3 (de) * 2018-10-11 2020-03-26 Sms Group Gmbh Wanddickenkontrolle beim Streckreduzieren von Rohren
CN113996663B (zh) * 2021-12-31 2022-03-11 太原科技大学 无缝管张力减径工艺减径率分配修正方法及系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06269831A (ja) † 1993-03-23 1994-09-27 Sumitomo Metal Ind Ltd ストレッチレデューサの管端肉厚制御方法
JP2001001019A (ja) † 1999-06-24 2001-01-09 Sumitomo Metal Ind Ltd マンドレルミルによる素管の圧延方法及びマンドレルミル
JP2004337941A (ja) † 2003-05-16 2004-12-02 Sumitomo Metal Ind Ltd 金属管製造装置および金属管の肉厚制御方法

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DE1602181B2 (de) 1967-10-06 1971-11-18 Stahl- und Röhrenwerk Reisholz GmbH, 4000 Düsseldorf Verfahren zur Verringerung verdickter Enden beim Streckreduzierwalzen von Rohren
FR2070965A5 (fr) 1969-12-12 1971-09-17 Nippon Kokan Kk
DE2347891C2 (de) 1973-09-24 1983-04-21 Kocks Technik Gmbh & Co, 4010 Hilden Walzstraße zum Streckreduzieren von Rohren
US4002048A (en) 1975-12-19 1977-01-11 Aetna-Standard Engineering Company Method of stretch reducing of tubular stock
SU715159A1 (ru) 1977-03-09 1980-02-15 Предприятие П/Я А-7697 Устройство дл регулировани толщины стенки труб при редуцировании
DE2947233C2 (de) * 1979-11-23 1992-03-12 Kocks Technik Gmbh & Co, 4010 Hilden Vorrichtung zur Steuerung der Wanddicke von Rohren
DE3028211C2 (de) 1980-07-25 1986-10-16 Kocks Technik Gmbh & Co, 4010 Hilden Walzstraße zum Streckreduzieren von Rohren
JPS6021114A (ja) * 1983-07-18 1985-02-02 Kawasaki Steel Corp 鋼管絞り圧延機の肉厚制御方法
JPS62124007A (ja) * 1985-11-20 1987-06-05 Kawasaki Steel Corp ストレツチレデユ−サの伸し長さ制御方法
DE3643659A1 (de) 1986-12-18 1988-07-07 Mannesmann Ag Verfahren zur steuerung der rohrwanddicke
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JPH07246414A (ja) 1994-03-10 1995-09-26 Nkk Corp ストレッチレデューサーの管端部肉厚制御方法
DE19840864C1 (de) * 1998-08-31 1999-07-29 Mannesmann Ag Verfahren zur Minimierung verdickter Enden beim Walzen von Rohren in einem Streckreduzierwalzwerk
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Publication number Priority date Publication date Assignee Title
JPH06269831A (ja) † 1993-03-23 1994-09-27 Sumitomo Metal Ind Ltd ストレッチレデューサの管端肉厚制御方法
JP2001001019A (ja) † 1999-06-24 2001-01-09 Sumitomo Metal Ind Ltd マンドレルミルによる素管の圧延方法及びマンドレルミル
JP2004337941A (ja) † 2003-05-16 2004-12-02 Sumitomo Metal Ind Ltd 金属管製造装置および金属管の肉厚制御方法

Also Published As

Publication number Publication date
EP3713686B1 (fr) 2022-10-05
US11602779B2 (en) 2023-03-14
RU2748571C1 (ru) 2021-05-26
MX2020005173A (es) 2020-08-20
ES2934481T3 (es) 2023-02-22
CN111372694A (zh) 2020-07-03
EP3713686A1 (fr) 2020-09-30
DE102017220750A1 (de) 2019-05-23
WO2019101727A1 (fr) 2019-05-31
US20200391263A1 (en) 2020-12-17

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