DE4039741A1 - Rolling pipes with control of temp. distribution - using measured geometry at rolling mechanism outlet to control local heating and/or cooling using on=line processor - Google Patents

Rolling pipes with control of temp. distribution - using measured geometry at rolling mechanism outlet to control local heating and/or cooling using on=line processor

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Publication number
DE4039741A1
DE4039741A1 DE4039741A DE4039741A DE4039741A1 DE 4039741 A1 DE4039741 A1 DE 4039741A1 DE 4039741 A DE4039741 A DE 4039741A DE 4039741 A DE4039741 A DE 4039741A DE 4039741 A1 DE4039741 A1 DE 4039741A1
Authority
DE
Germany
Prior art keywords
rolling
temp
distribution
pipe
cooling
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
Application number
DE4039741A
Other languages
German (de)
Other versions
DE4039741B4 (en
Inventor
Peter Dipl Ing Thieven
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 Siemag AG
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Priority to DE4039741A priority Critical patent/DE4039741B4/en
Priority to FR9114238A priority patent/FR2670141B1/en
Priority to ITMI913262A priority patent/IT1252620B/en
Publication of DE4039741A1 publication Critical patent/DE4039741A1/en
Application granted granted Critical
Publication of DE4039741B4 publication Critical patent/DE4039741B4/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • 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
    • B21B21/00—Pilgrim-step tube-rolling, i.e. pilger mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature
    • B21B2261/21—Temperature profile

Abstract

The method of rolling pipes involves setting a desired temp. distribution in the roll material before and/or during the rolling process. The temp. distribution varies the shaping resistance of the material region by region. The pipe's geometric characteristics to be influenced are measured at the outlet of the mechanism and fed to a control loop contg. a demand-actual value comparator, a real time processor and signal convertor. The actual-demand difference is processed into a correction value using theoretical data. The converted correction value is used for local adjustment of the temp. distribution in the material before it enters the rolling mechanism. ADVANTAGE - Enables local temp. distribution of pipe material to be adjusted by local heating and/or cooling.

Description

Die Erfindung betrifft ein Verfahren zum Walzen von Rohren, insbesondere in Streckreduzier-, Pilger- oder Kontiwalzwerken, bei dem vor dem Walzvorgang und/oder während des Walzvorganges eine gezielte, die Umformfestigkeit des Rohres bereichsweise verändernde Temperaturverteilung im Walzgut eingestellt wird.The invention relates to a method for rolling pipes, in particular in stretch reducing, pilgrim or continuous rolling mills, in which before Rolling process and / or a specific during the rolling process Resistance to deformation of the pipe in some areas Temperature distribution in the rolling stock is set.

Beim Walzen von Rohren beeinflußt die Temperatur des Rohres bekanntlich die Umformfestigkeit des zu verformenden Materials. Temperaturveränderungen führen zu Veränderungen dieser Festigkeit und damit zu unterschiedlichen Umformergebnissen. Andererseits wird der Umformgrad des Walzgutes durch die Walzverfahren selbst beeinflußt, wobei es mitunter zu unerwünschten, als Fehler anzusehenden Verformungen kommen kann. Zu nennen sind z. B. Fehler an der Innenoberfläche des Rohres in Form von Polygonbildungen. Schließlich hat die Temperatur bzw. die Temperaturänderung ggfs. auch einen Einfluß auf das Gefüge des zu walzenden Rohres. As is known, when pipes are rolled, the temperature of the pipe is influenced the deformation resistance of the material to be deformed. Changes in temperature lead to changes in this strength and thus to different forming results. On the other hand, the Degree of deformation of the rolling stock is influenced by the rolling process itself, which sometimes leads to undesirable deformations that can be regarded as faults can come. To mention are z. B. Defects on the inner surface of the Pipe in the form of polygon formation. Finally, the temperature or the change in temperature may also have an influence on the structure of the rolling pipe.  

Aus dem SU-Urheberschein 3 49 424 ist ein Verfahren zum Längswalzen von Rohren bekannt geworden, bei dem eine besondere Abkühlung der Bereiche des Rohres vorgenommen wird, die sich in den Zwischenräumen zwischen den Kalibern befinden. Zu diesem Zweck wird mittels einer Kühlmittelzufuhr unter Hochdruck Kühlflüssigkeit auf das Rohr gelenkt, und zwar unmittelbar vor den Walzen. Die so gekühlten Bereiche werden weniger druckverformt als die benachbarten Bereiche, die eine höhere Temperatur aufweisen. Im Ergebnis wird dadurch eine Vergleichmäßigung der Wanddicke erreicht und damit die Qualität des Rohres verbessert.From SU copying certificate 3 49 424 a method for the longitudinal rolling of pipes has become known, in which a special cooling of the areas of the pipe is carried out, which are located in the spaces between the calibres. For this purpose, coolant is directed onto the pipe by means of a coolant supply under high pressure, directly in front of the rollers. The areas cooled in this way are less compressed than the neighboring areas, which have a higher temperature. As a result, the wall thickness is evened out and the quality of the pipe is improved.

Das bekannte Verfahren arbeitet mit empirischen Einstellwerten, d. h. es wird lediglich der Bereich des Rohres undefiniert gekühlt, der gegenüber anderen Bereichen des Rohres wärmer ist.The known method works with empirical setting values, i. H. it only the area of the pipe is cooled indefinitely is warmer than other areas of the tube.

Ausgehend von diesem Stand der Technik und den eingangs geschilderten Problemen wird durch die Erfindung ein Verfahren vorgeschlagen, das dadurch gekennzeichnet ist, daß die zu beeinflussenden Geometriegrößen des gewalzten Rohres an der Auslaufseite des Walzwerkes erfaßt und einer Regelstrecke zugeführt werden, die aus einem Soll-Ist-Wertvergleich, einem on-line arbeitenden Prozeßrechner und einem Signalumformer besteht, wobei der Differenzwert des Soll-Ist-Wertvergleiches in dem Prozeßrechner anhand von theoretisch vorgegebenen anlagen- und walzgutspezifischen Daten zu einem Korrekturwert verarbeitet wird, der in ein Signal umgeformt, zur lokalen Einstellung der Temperaturverteilung im Walzgut vor dessen Einlauf in das Walzwerk verwendet wird.Based on this state of the art and the above Problems are proposed by the invention, a method that is characterized in that the geometry sizes to be influenced of the rolled pipe on the outlet side of the rolling mill and a controlled system can be fed from a Target / actual value comparison, an on-line process computer and a signal converter, the difference value of the Target-actual value comparison in the process computer based on theoretical given plant and rolling stock-specific data for one Correction value is processed, which is converted into a signal for local Setting the temperature distribution in the rolling stock before it enters the rolling mill is used.

Erst durch die Verknüpfung einer Meßeinrichtung am Austritt des Rohrwalzwerkes mit der Erwärmungs- und/oder Abkühlungseinrichtung vor dem Walzwerk läßt sich das erfindungsgemäße Verfahren bedarfsgerecht anwenden. Im Gegensatz zum Stand der Technik und nach einem besonderen Merkmal der Erfindung kann die Einstellung der Temperaturverteilung sowohl durch lokales Erwärmen und/oder durch Abkühlen des Walzgutes erfolgen.Only by linking a measuring device at the outlet of the Pipe rolling mill with the heating and / or cooling device the rolling mill, the method according to the invention can be tailored to requirements  apply. In contrast to the state of the art and according to a special one A feature of the invention is the adjustment of the temperature distribution both by local heating and / or by cooling the rolling stock respectively.

In einer weiteren besonderen Ausgestaltung der Erfindung wird vorgesehen, daß der Korrekturwert zur Voreinstellung der Temperaturverteilung in dem dem eingestellten Walzgut folgenden Walzgut verwendet wird. Das bedeutet, daß der aus einem vorangehenden Walzprozeß ermittelte Korrekturwert für den nachfolgenden Rohrstrang als Vorsteuerung verwendet werden kann, so daß bereits eine Beeinflussung des im Walzwerk befindlichen Rohrstranges vor Erreichen der auslaufseitigen Meßeinrichtung ermöglicht ist.In a further special embodiment of the invention provided that the correction value for presetting the Temperature distribution in the rolling stock following the set rolling stock is used. That means that from a previous one Rolling process determined correction value for the subsequent pipe string can be used as feedforward control, so that already one Influencing the pipe string in the rolling mill before reaching it the outlet-side measuring device is made possible.

Eine Vorrichtung zur Durchführung des Verfahrens ist gekennzeichnet durch ein hinter dem Walzwerk vorgesehenes mehrkanaliges Durchstrahlungsgerät zur Messung der Wanddicke des auslaufenden Rohres, dessen Meßwert nach Verarbeitung in einem Prozeßrechner als Signal einer Heiz- und/oder Kühleinrichtung zuführbar ist. Die Heiz- und/oder Kühleinrichtungen können herkömmlicher Bauart sein; beispielsweise kann die Erwärmung durch gasförmige Heizmedien, konduktiv oder induktiv arbeitende Einrichtungen oder durch Laser- oder Elektrodenbestrahlung erfolgen. Auch der Kontakt mit flüssigen Heizmedien oder entsprechenden Zusatzvorrichtungen in Form von Wärmeöfen ist möglich. Eine gezielte Abkühlung des Walzgutes kann ebenfalls durch bekannte Kühlverfahren, durch flüssige oder gasförmige Kühlmedien oder durch Kontakt mit festen Kühlkörpern erfolgen.A device for carrying out the method is identified through a multi-channel system provided behind the rolling mill Radiographic device for measuring the wall thickness of the outgoing pipe, the measured value after processing in a process computer as a signal a heating and / or cooling device can be supplied. The heating and / or Cooling devices can be of conventional design; for example can heating by gaseous heating media, conductive or inductive working facilities or by laser or electrode radiation respectively. Even contact with liquid heating media or equivalent Additional devices in the form of heating ovens are possible. A targeted one The rolling stock can also be cooled by known cooling processes, by liquid or gaseous cooling media or by contact with solid Heatsinks are made.

In einer grob vereinfachten schematischen Darstellung ist der erfindungsgemäße Regelkreis eines Reduzierwalzwerkes dargestellt. Er besteht aus der Wanddickenmeßeinrichtung in Form eines mehrkanaligen Durchstrahlungsgerätes 1, aus der Regelstrecke 2 mit Soll-Ist-Wertvergleich und integriertem Prozeßrechner und der Einrichtung 3 zum Erwärmen und/oder Abkühlen des Rohres 4. Das Durchstrahlungsgerät 1 ist mit der Einrichtung 3 über die Regelstrecke 2 verknüpft, wie vorstehend beschrieben. Die Walzen des Reduzierwalzwerkes sind mit 4 schematisch angedeutet.The control loop according to the invention of a reducing rolling mill is shown in a roughly simplified schematic illustration. It consists of the wall thickness measuring device in the form of a multi-channel radiographic device 1 , of the controlled system 2 with a target / actual value comparison and integrated process computer and the device 3 for heating and / or cooling the pipe 4 . The radiographic device 1 is linked to the device 3 via the controlled system 2 , as described above. The rolls of the reducing mill are indicated schematically by 4 .

Claims (4)

1. Verfahren zum Walzen von Rohren, insbesondere in Streckreduzier-, Pilger- oder Kontiwalzwerken, bei dem vor dem Walzvorgang und/oder während des Walzvorganges eine gezielte, die Umformfestigkeit des Rohrs bereichsweise verändernde Temperaturverteilung im Walzgut eingestellt wird, dadurch gekennzeichnet, daß die zu beeinflussenden Geometriegrößen des gewalzten Rohres an der Auslaufseite des Walzwerkes erfaßt und einer Regelstrecke zugeführt werden, die aus einem Soll-Ist-Wertvergleich, einem on-line arbeitenden Prozeßrechner und einem Signalumformer besteht, wobei der Differenzwert des Soll-Ist-Wertvergleiches in dem Prozeßrechner anhand von theoretisch vorgegebenen anlagen- und walzgutspezifischen Daten zu einem Korrekturwert verarbeitet wird, der in ein Signal umgeformt zur lokalen Einstellung der Temperaturverteilung im Walzgut vor dessen Einlauf in das Walzwerk verwendet wird. 1. A method for rolling pipes, in particular in stretch-reducing, pilgrim or continuous rolling mills, in which a specific temperature distribution in the rolling stock, which changes the deformation resistance of the pipe in certain areas, is set before the rolling process and / or during the rolling process, characterized in that the influencing geometrical quantities of the rolled pipe on the outlet side of the rolling mill are detected and fed to a controlled system which consists of a target-actual value comparison, an on-line process computer and a signal converter, the difference value of the target-actual value comparison being used in the process computer from theoretically predetermined plant and rolling stock-specific data is processed to a correction value, which is converted into a signal and used to locally adjust the temperature distribution in the rolling stock before it enters the rolling mill. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Einstellung der Temperaturverteilung durch lokales Erwärmen und/oder Abkühlen des Walzgutes erfolgt.2. The method according to claim 1, characterized, that the setting of the temperature distribution by local Heating and / or cooling of the rolling stock takes place. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Korrekturwert zur Voreinstellung der Temperaturverteilung in dem dem eingestellten Walzgut folgenden Walzgut verwendet wird.3. The method according to claim 1, characterized, that the correction value for presetting the temperature distribution is used in the rolling stock following the set rolling stock. 4. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß hinter dem Walzwerk (4) ein mehrkanaliges Durchstrahlungsgerät (1) zur Messung der Wanddicke des auslaufendes Rohres (4) vorgesehen ist, dessen Meßwert nach Verarbeitung in einem Prozeßrechner (2) als Signal einer Heiz- und/oder Kühleinrichtung (3) zuführbar ist.4. Apparatus for performing the method according to claim 1 to 3, characterized in that behind the rolling mill ( 4 ) a multi-channel radiographic device ( 1 ) is provided for measuring the wall thickness of the outgoing pipe ( 4 ), the measured value after processing in a process computer ( 2 ) can be supplied as a signal to a heating and / or cooling device ( 3 ).
DE4039741A 1990-12-10 1990-12-10 Method and device for rolling pipes, in particular in stretch-reducing, pilgering or continuous rolling mills Expired - Fee Related DE4039741B4 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE4039741A DE4039741B4 (en) 1990-12-10 1990-12-10 Method and device for rolling pipes, in particular in stretch-reducing, pilgering or continuous rolling mills
FR9114238A FR2670141B1 (en) 1990-12-10 1991-11-19 PROCESS AND DEVICE FOR ROLLING TUBES, PARTICULARLY IN STRETCH-REDUCING ROLLING MACHINES, WITH PILGRIMS OR CONTINUOUSLY.
ITMI913262A IT1252620B (en) 1990-12-10 1991-12-05 PROCEDURE AND DEVICE FOR THE LAMINATION OF PIPES, IN PARTICULAR IN LAMINATORS, REDUCERS-REDUCERS, PELLEGRINO OR CONTINUOUS STEP

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4039741A DE4039741B4 (en) 1990-12-10 1990-12-10 Method and device for rolling pipes, in particular in stretch-reducing, pilgering or continuous rolling mills

Publications (2)

Publication Number Publication Date
DE4039741A1 true DE4039741A1 (en) 1992-06-11
DE4039741B4 DE4039741B4 (en) 2005-03-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE4039741A Expired - Fee Related DE4039741B4 (en) 1990-12-10 1990-12-10 Method and device for rolling pipes, in particular in stretch-reducing, pilgering or continuous rolling mills

Country Status (3)

Country Link
DE (1) DE4039741B4 (en)
FR (1) FR2670141B1 (en)
IT (1) IT1252620B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0788850A1 (en) * 1995-08-25 1997-08-13 Kawasaki Steel Corporation Steel pipe manufacturing method and apparatus and steel pipe manufactured thereby
DE10332221A1 (en) * 2003-07-16 2005-02-17 Benteler Stahl/Rohr Gmbh Minimizing thickened ends during rolling of metallic rolled products in stretch reducing mill comprises heating end sections of rolled products to higher temperature than average rolling temperature
WO2020074620A1 (en) * 2018-10-11 2020-04-16 Sms Group Gmbh Wall thickness monitoring while stretch-reducing tubes

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3496745A (en) * 1967-05-01 1970-02-24 Kocks Gmbh Friedrich Process for stretch-reducing tubes
DE3319383A1 (en) * 1983-05-26 1984-11-29 Mannesmann AG, 4000 Düsseldorf METHOD FOR IMPROVING THE EXTERNAL DIAMETER AND WALL THICKNESS TOLERANCES IN MEASURING ROLLS AND REDUCTION OF TUBE TUBE
DD241022A1 (en) * 1985-09-19 1986-11-26 Freiberg Bergakademie METHOD FOR REGULATING THE TOTAL TURNING GROSS DURING TUBE PRODUCTION
JPS6289515A (en) * 1985-10-14 1987-04-24 Nippon Steel Corp Temperature control method and device for hot rolling stock

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0788850A1 (en) * 1995-08-25 1997-08-13 Kawasaki Steel Corporation Steel pipe manufacturing method and apparatus and steel pipe manufactured thereby
EP0788850A4 (en) * 1995-08-25 2001-07-25 Kawasaki Steel Co Steel pipe manufacturing method and apparatus and steel pipe manufactured thereby
DE10332221A1 (en) * 2003-07-16 2005-02-17 Benteler Stahl/Rohr Gmbh Minimizing thickened ends during rolling of metallic rolled products in stretch reducing mill comprises heating end sections of rolled products to higher temperature than average rolling temperature
DE10332221B4 (en) * 2003-07-16 2006-05-11 Benteler Stahl/Rohr Gmbh Method for minimizing thickened ends during rolling of rolled products
WO2020074620A1 (en) * 2018-10-11 2020-04-16 Sms Group Gmbh Wall thickness monitoring while stretch-reducing tubes
US11648597B2 (en) 2018-10-11 2023-05-16 Sms Group Gmbh Wall thickness monitoring while stretch-reducing tubes

Also Published As

Publication number Publication date
ITMI913262A1 (en) 1993-06-05
FR2670141A1 (en) 1992-06-12
FR2670141B1 (en) 1995-04-21
ITMI913262A0 (en) 1991-12-05
IT1252620B (en) 1995-06-19
DE4039741B4 (en) 2005-03-10

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Owner name: SMS DEMAG AG, 40237 DUESSELDORF, DE

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