WO1999033588A1 - Method and device for descaling pipes - Google Patents

Method and device for descaling pipes Download PDF

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Publication number
WO1999033588A1
WO1999033588A1 PCT/DE1998/003749 DE9803749W WO9933588A1 WO 1999033588 A1 WO1999033588 A1 WO 1999033588A1 DE 9803749 W DE9803749 W DE 9803749W WO 9933588 A1 WO9933588 A1 WO 9933588A1
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WIPO (PCT)
Prior art keywords
stopper
plug
rolling
valve
descaling
Prior art date
Application number
PCT/DE1998/003749
Other languages
German (de)
French (fr)
Inventor
Hans-Georg Blanck
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 AU25100/99A priority Critical patent/AU2510099A/en
Publication of WO1999033588A1 publication Critical patent/WO1999033588A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
    • B21B25/04—Cooling or lubricating mandrels during operation
    • 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
    • B21B17/08—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel having one or more protrusions, i.e. only the mandrel plugs contact the rolled tube; Press-piercing mills
    • B21B17/12—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel having one or more protrusions, i.e. only the mandrel plugs contact the rolled tube; Press-piercing mills in a discontinuous process, e.g. plug-rolling mills

Definitions

  • the invention relates to a method and a device for the internal descaling of the down tube during the rolling process in a plug rolling mill.
  • U.S. Patent 1,945,929 suggests closing the interior of the hollow block, e.g. lubricate with salt.
  • the salt dissolves and binds the tinder to a liquid mass, but ultimately cannot decisively prevent the "growth" of the stopper.
  • Another measure is the targeted opening of the roll caliber or the roll adjustment using an opening ramp based on experience.
  • This method a compensation of the change in wall thickness is possible within limits, but the method is complex and not stable over time with changed rolling parameters, in particular temperatures. Continuous wall thickness measurements of the stopper tube over the entire rolling length and, depending on the findings, changes in the caliber opening ramps are required.
  • a control loop is not possible, but only the change of the control specification (opening ramp) to correct unsatisfactory rolling results.
  • the aim of the present invention is to use the stretch rolling process in the plug rolling mill to achieve a uniform tube wall over the entire length of the roll to produce that the deformation process in the interior of the pipe is kept free from the scale so that the described plug cannot grow.
  • Tinder was blasted off the inner pipe wall and rinsed with the same medium. A "waxing" of the stopper is thereby reliably prevented, so that a uniform tube wall thickness and thus perfect quality of the rolled tubes can be expected.
  • An operational use of the internal descaling according to the invention during the rolling process requires the descaling nozzles to be pressurized at exactly the same time as the start of the rolling process or the immediate shutdown at the end of the rolling.
  • the valve control for switching the pressure water on and off can be done mechanically as well as by external control
  • Modern plug rolling mills are usually equipped with a plug changing device.
  • This device has i.a. the task of keeping the stopper for the next rolling in such a position that the inserted tube in the rolling direction grasp the stopper and place it between the
  • stopper on the stopper rod Can carry work rolls up to the stopper on the stopper rod.
  • stopper rod head At the stop of the stopper rod (stopper rod head) the stopper is positioned exactly in the rolling caliber. The stopper is pressed against the head of the stopper rod by the forming force in the direction of the pipe axis and held in the rolling position.
  • the position "stopper on the stopper rod” is synonymous with “rolling start”. At “end of roll” the stopper suddenly loses the holding force that holds it on the stopper rod and it falls off.
  • This system makes use of the invention by proposing that the pressurized water for the internal descaling is supplied via a valve which is mechanically switched on and off and which is acted upon by the shaping force applied in the pipe axis direction against the pending one
  • the system pressure of the water opens and closes when the forming force acting on the stopper ceases due to the system pressure of the water
  • valve control for the connection and disconnection of the pressurized water for the internal descaling is thus done mechanically, the switching element is the stopper, which, when subjected to the forming force applied in the pipe axis direction, opens the check valve against the system pressure of the water. At the end of the roll, the forming force on the stopper is eliminated, and the valve closes due to the system pressure of the water.
  • the valve is preferably arranged coaxially to the plug rod between the latter and the plug.
  • a pressure spring acting on the valve is assigned to the system pressure of the pressurized water for closing the valve.
  • Fig.1 the system configuration of the plug rolling mill
  • Fig.1 shows the system configuration of the plug rolling mill, consisting of the
  • the stopper rod 2 carries the front or centering stopper 5 and the work stopper 6 at its front end.
  • Pressurized water supply provided, which also covers the rod cooling in addition to the inner tube descaling.
  • Fig. 2 shows the rod head of the plug rod 2 with the integrated valve lifter 17 of the check valve 13.
  • the upper illustration (above the center line) shows the
  • the stopper here consisting of pre-stopper 5, working stopper 6 and stopper screw 10, is centered over the centering cone 12 of stopper screw 10 and valve tappet 17 to stopper rod 2.
  • the forming force presses the valve tappet 17 over the working plug 6 until it opens.
  • the forming force ensures a high contact pressure between the working plug 6 and the valve body 13 and ensures an adequate sealing of the pressure space between the plug 5, 6 and the plug rod 2 when the valve 13, 17 is open.
  • the pressurized water finds its way through the working plug 6 and the nozzles 9 to the point of impact on the inner wall of the front pipe 2.
  • the lower illustration (below the center line) shows the head of the stopper rod 2 outside the rolling phase.
  • the valve 13, 17 is blocked, the valve tappet 17 has come forward by the amount of the switching stroke via the valve body 13.

Abstract

The method relates to a method for descaling the inside of the preliminary pipe during rolling in a plug rolling mill. According to said method, to remove the scale pressurized water, which is emitted through nozzles in the direction of rolling and fed through the stopper rod and the stopper, is pressed onto the interior surface of the preliminary pipe directly in front of the stopper. This water blasts the scale off the interior surface of the pipe and flushes the scale out of the pipe against the direction of rolling. To carry out this method the invention provides for a device in which the pressurized water used for descaling of the interior is supplied via a valve (13, 17) which is controlled by the stopper (5, 6) and can be opened and closed mechanically. The valve is impinged upon by the deformation force applied in the direction of the pipe axis and opens against the system pressure of the pressurized water (1) and closes with the system pressure of the pressurized water (1) when the deformation force acting on the stopper (5, 6) ceases.

Description

Verfahren und Vorrichtung zum Entzundern von RohrenMethod and device for descaling pipes
Beschreibungdescription
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Innenentzundern des Vorrohres während des Walzprozesses in einem Stopfenwalzwerk.The invention relates to a method and a device for the internal descaling of the down tube during the rolling process in a plug rolling mill.
Während des Walzprozesses im Stopfenwalzwerk sammelt sich mit fortschreitender Walzung der im Vorrohr vorhandene Zunder vor dem Stopfen und baut sich zunehmend auf dem Stopfen auf. Das Ergebnis dieses Prozesses ist, daß der Stopfen während des Umformprozesses "wächst", wodurch sich die Rohrwand kontinuierlich von Walzstart bis Walzende über die gesamte produzierte Rohrlänge reduziert.During the rolling process in the plug rolling mill, as the rolling progresses, the scale present in the front pipe collects in front of the plug and builds up increasingly on the plug. The result of this process is that the plug "grows" during the forming process, whereby the tube wall is continuously reduced from the start to the end of the roll over the entire length of the tube produced.
Es sind verschiedene Maßnahmen bekannt, um diesem Problem zu begegnen. So wird durch die US-PAtentschrift 1 ,945,929 vorgeschlagen, das Hohlblockinnere zu, z.B. mit Salz schmieren. Das Salz löst und bindet den Zunder zu einer flüssigen Masse, kann aber letztlich das "Wachsen" des Stopfens nicht entscheidend verhindern.Various measures are known to counter this problem. For example, U.S. Patent 1,945,929 suggests closing the interior of the hollow block, e.g. lubricate with salt. The salt dissolves and binds the tinder to a liquid mass, but ultimately cannot decisively prevent the "growth" of the stopper.
Eine andere Maßnahme ist das gezielte Öffnen des Walzkalibers bzw. der Walzenanstellung über eine Öffnungsrampe nach Erfahrungswerten. Mit diesem Verfahren ist zwar eine Kompensation der Wandddickenänderung in Grenzen möglich, doch ist das Verfahren aufwendig und über die Zeit bei veränderten Walzparametern, insbesondere Temperaturen, nicht stabil. Erforderlich sind kontinuierliche Wanddickenmessungen des Stopfenrohres über die gesamten Walzlängen und, je nach Befund, Änderungen der Kaliber-Öffnungsrampen. Ein Regelkreis ist nicht möglich, sondern nur die Änderung der Steuerungsvorgabe (Öffnungsrampe) zur Korrektur unbefriedigender Walzergebnisse.Another measure is the targeted opening of the roll caliber or the roll adjustment using an opening ramp based on experience. With this method, a compensation of the change in wall thickness is possible within limits, but the method is complex and not stable over time with changed rolling parameters, in particular temperatures. Continuous wall thickness measurements of the stopper tube over the entire rolling length and, depending on the findings, changes in the caliber opening ramps are required. A control loop is not possible, but only the change of the control specification (opening ramp) to correct unsatisfactory rolling results.
Ziel der vorliegenden Erfindung ist es, mit dem Streckwalzprozess im Stopfenwalzwerk eine gleichförmige Rohrwand über die gesamte Walzlänge dadurch zu erzeugen, daß auch der Verformungsprozess im Rohrinnern vom Zunder freigehalten wird, damit es nicht zu dem beschriebenen Wachsen des Stopfens kommen kann.The aim of the present invention is to use the stretch rolling process in the plug rolling mill to achieve a uniform tube wall over the entire length of the roll to produce that the deformation process in the interior of the pipe is kept free from the scale so that the described plug cannot grow.
Zur Lösung der Aufgabe wird erfindungsgemäß vorgeschlagen, daß zum Ablösen des Zunders unmittelbar vor dem Stopfen auf die Vorrohrinnenoberfläche durch die Stopfenstange und den Stopfen zugeführtes und in Walzrichtung vor dem Stopfen durch Düsen austretendes Druckwasser gepreßt wird, das den Zunder von der Rohrinnenwand absprengt und den gelösten Zunder entgegen der Walzrichtung aus dem Rohr ausgespült. Mit dem Druckwasser wird in äußerst einfacher Weise derTo achieve the object, it is proposed according to the invention that, in order to detach the scale immediately before the stopper is fed to the inner tube surface through the stopper rod and the stopper and in the rolling direction before the stopper is pressed through pressurized water which sprays the scale off the inner tube wall and loosens it Tinder rinsed out of the pipe against the rolling direction. With the pressurized water, the
Zunder von der Vorrohrinnenwand abgesprengt und mit dem gleichen Medium ausgespült. Ein „Wachsen" des Stopfens wird dadurch sicher verhindert, so daß eine gleichmäßige Rohrwanddicke und somit einwandfreie Qualität der gewalzten Rohre zu erwarten ist.Tinder was blasted off the inner pipe wall and rinsed with the same medium. A "waxing" of the stopper is thereby reliably prevented, so that a uniform tube wall thickness and thus perfect quality of the rolled tubes can be expected.
Eine betriebsgerechte Nutzung der erfindungsgemäßen Innenentzunderung beim Walzprozess erfordert eine zeitlich exakt mit dem Walzstart einsetzende Druckbeaufschlagung der Entzunderungsdüsen bzw. bei Walzende die sofortige Abschaltung. Die Ventilsteuerung für das Zu- und Abschalten des Druckwassers kann sowohl mechanisch direkt als auch durch Fremdansteuerung erfolgenAn operational use of the internal descaling according to the invention during the rolling process requires the descaling nozzles to be pressurized at exactly the same time as the start of the rolling process or the immediate shutdown at the end of the rolling. The valve control for switching the pressure water on and off can be done mechanically as well as by external control
Neuzeitliche Stopfenwalzwerke sind in der Regel mit einer Stopfenwechselvorrichtung ausgerüstet. Diese Vorrichtung hat u.a. die Aufgabe, den Stopfen für die nächstfolgende Walzung in einer derartigen Position vorzuhalten, daß das in Walzrichtung eingestoßene Vorrohr den Stopfen erfassen und ihn zwischen dieModern plug rolling mills are usually equipped with a plug changing device. This device has i.a. the task of keeping the stopper for the next rolling in such a position that the inserted tube in the rolling direction grasp the stopper and place it between the
Arbeitswalzen bis zum Anschlag an der Stopfenstange mitführen kann. Am Anschlag der Stopfenstange (Stopfenstangenkopf) ist der Stopfen exakt im Walzkaliber positioniert. Durch die Umformkraft in Rohrachsrichtung wird der Stopfen gegen den Kopf der Stopfenstange gepreßt und in Walzposition gehalten. Die Position "Stopfen an der Stopfenstange" ist zeitlich gleichbedeutend mit "Walzstart". Bei "Walzende" verliert der Stopfen schlagartig die Haltekraft, die ihn an der Stopfenstange hält, und er fällt ab. Dieses System macht sich die Erfindung zunutze, indem es vorschlägt, daß das Druckwassers für die Innenentzunderung über ein vom Stopfen gesteuertes mechanisch zu- und abschaltbares Ventil zugeleitet wird, das von der in Rohrachsrichtung aufgebrachten Umformkraft beaufschlagt gegen den anstehenden Systemdruck des Wassers öffnet und bei Wegfall der auf den Stopfen wirkenden Umformkraft durch den Systemdruck des Wassers schließtCan carry work rolls up to the stopper on the stopper rod. At the stop of the stopper rod (stopper rod head) the stopper is positioned exactly in the rolling caliber. The stopper is pressed against the head of the stopper rod by the forming force in the direction of the pipe axis and held in the rolling position. The position "stopper on the stopper rod" is synonymous with "rolling start". At "end of roll" the stopper suddenly loses the holding force that holds it on the stopper rod and it falls off. This system makes use of the invention by proposing that the pressurized water for the internal descaling is supplied via a valve which is mechanically switched on and off and which is acted upon by the shaping force applied in the pipe axis direction against the pending one The system pressure of the water opens and closes when the forming force acting on the stopper ceases due to the system pressure of the water
Die Ventilsteuerung für das Zu- und Abschalten des Druckwassers für die Innenentzunderung erfolgt somit mechanisch, das Schaltelement ist der Stopfen, der beaufschlagt von der in Rohrachsrichtung aufgebrachten Umformkraft gegen den anstehenden Systemdruck des Wassers das Rückschlagventil öffnet. Bei Walzende entfällt die auf den Stopfen wirkende Umformkraft, das Ventil schließt durch den Systemdruck des Wassers.The valve control for the connection and disconnection of the pressurized water for the internal descaling is thus done mechanically, the switching element is the stopper, which, when subjected to the forming force applied in the pipe axis direction, opens the check valve against the system pressure of the water. At the end of the roll, the forming force on the stopper is eliminated, and the valve closes due to the system pressure of the water.
Die Vorteile der mechanischen Ventildirektsteuerung sind darin zu sehen, daß das Ventil sich direkt hinter dem Stopfen befindet, der Weg des Druckwassers vom Ventil bis zur Verbraucherstelle an der Düse ist dadurch optimal kurz. Der Entzunderungsvorgang, d.h. die Ventilöffnung, ist nur bei Walzdruck möglich, so daß Fehlsteuerungen ausgeschlossen sind.The advantages of the mechanical direct valve control can be seen in the fact that the valve is located directly behind the stopper, the path of the pressurized water from the valve to the consumer point on the nozzle is therefore optimally short. The descaling process, i.e. the valve opening is only possible at rolling pressure, so that incorrect controls are excluded.
Vorzugsweise ist das Ventil koaxial zur Stopfenstange zwischen dieser und dem Stopfen angeordnet. In einer Ausgestaltung der Erfindung ist vorgesehen, daß dem Systemdruck des Druckwassers zum Schließen des Ventils eine auf das Ventil wirkende Druckfeder zugeordnet ist.The valve is preferably arranged coaxially to the plug rod between the latter and the plug. In one embodiment of the invention it is provided that a pressure spring acting on the valve is assigned to the system pressure of the pressurized water for closing the valve.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend beschrieben. Es zeigt:An embodiment of the invention is shown in the drawing and is described below. It shows:
Fig.1 die Anlagenkonfiguration des Stopfenwalzwerkes undFig.1 the system configuration of the plug rolling mill and
Fig.2 den Stangenkopf der Stopfenstange mit dem integrierten VentilstößelFig.2 the rod head of the plug rod with the integrated valve lifter
Fig.1 zeigt die Anlagenkonfiguration des Stopfenwalzwerkes, bestehend aus denFig.1 shows the system configuration of the plug rolling mill, consisting of the
Arbeitswalzen 3 dem Vorrohr 7, den Rückholwalzen 4 und der Stopfenstange 2 mit dem Widerlager 8. Die Stopfenstange 2 trägt an ihrem vorderen Ende den Vor- oder Zentrierstopfen 5 und den Arbeitsstopfen 6. Mit 1 ist schematisch die Zuführung des Druckwassers dargestellten. Im Gegensatz zur bekannten Ausführung, wo die Stopfenstange 2 mit Kühlwasser versorgt wird, ist hier erfindungsgemäß eine Druckwasserversorgung vorgesehen, die neben der Rohrinnenentzunderung auch die Stangenkühlung deckt.Work rolls 3 the front pipe 7, the return rolls 4 and the stopper rod 2 with the abutment 8. The stopper rod 2 carries the front or centering stopper 5 and the work stopper 6 at its front end. In contrast to the known embodiment, where the plug rod 2 is supplied with cooling water, here is one according to the invention Pressurized water supply provided, which also covers the rod cooling in addition to the inner tube descaling.
Fig. 2 zeigt den Stangenkopf der Stopfenstange 2 mit dem integrierten Ventilstößel 17 des Rückschlagventils 13. Die obere Darstellung (oberhalb der Mittellinie) zeigt dieFig. 2 shows the rod head of the plug rod 2 with the integrated valve lifter 17 of the check valve 13. The upper illustration (above the center line) shows the
Situation während des Walzvorganges. Der Stopfen, hier bestehend aus Vorstopfen 5, Arbeitsstopfen 6 und Stopfenschraube 10, ist über den Zentrierkegel 12 von Stopfenschraube 10 und Ventilstößel 17 zur Stopfenstange 2 zentriert. Die Umformkraft drückt über den Arbeitsstopfen 6 den Ventilstößel 17 ein bis zur Vertilöffnung. Die Umformkraft sorgt andererseits für einen hohen Anpreßdruck zwischen Arbeitstopfen 6 und Ventilkörper 13 und gewährleistet eine ausreichende Abdichtung des Druckraumes zwischen Stopfen 5,6 und Stopfenstange 2 bei geöffnetem Ventil 13,17. Das Druckwasser findet seinen Weg durch den Arbeits stopfen 6 und die Düsen 9 bis zum Auftreffpunkt an der Innenwand des Vorrohres 2.Situation during the rolling process. The stopper, here consisting of pre-stopper 5, working stopper 6 and stopper screw 10, is centered over the centering cone 12 of stopper screw 10 and valve tappet 17 to stopper rod 2. The forming force presses the valve tappet 17 over the working plug 6 until it opens. The forming force, on the other hand, ensures a high contact pressure between the working plug 6 and the valve body 13 and ensures an adequate sealing of the pressure space between the plug 5, 6 and the plug rod 2 when the valve 13, 17 is open. The pressurized water finds its way through the working plug 6 and the nozzles 9 to the point of impact on the inner wall of the front pipe 2.
Die untere Darstellung (unterhalb der Mittellinie) zeigt den Kopf der Stopfenstange 2 außerhalb der Walzphase. Das Ventil 13,17 ist gesperrt, der Ventilstößel 17 ist um den Betrag des Schalthubes über den Ventilkörper 13 nach vorne herausgetreten. The lower illustration (below the center line) shows the head of the stopper rod 2 outside the rolling phase. The valve 13, 17 is blocked, the valve tappet 17 has come forward by the amount of the switching stroke via the valve body 13.

Claims

Patentansprüche claims
1. Verfahren zum Innenentzundern des Vorrohres während des Walzprozesses in einem Stopfenwalzwerk, dadurch gekennzeichnet, daß zum Ablösen des Zunders unmittelbar vor dem Stopfen auf die Vorrohrinnenoberfläche durch die Stopfenstange und den Stopfen zugeführtes und in Walzrichtung vor dem Stopfen durch Düsen austretendes Druckwasser gepreßt wird, das den Zunder von der Rohrinnenwand absprengt und den gelösten Zunder entgegen der Walzrichtung aus dem Rohr ausgespült.1. A method for descaling the inner tube during the rolling process in a plug rolling mill, characterized in that to release the scale immediately before plugging onto the inner tube surface through the plug rod and the plug, and in the rolling direction before the plug is discharged through pressurized water which is pressed sprinkles the scale off the inside wall of the pipe and rinses the loosened scale out of the pipe against the rolling direction.
2. Vorrichtung zur Durchführung des Verfahrens zum Innenentzundern des Vorrohres während des Walzprozesses in einem Stopfenwalzwerk nach2. Apparatus for carrying out the method for descaling the inner tube during the rolling process in a plug rolling mill
Anspruch 1 dadurch gekennzeichnet, daß das Druckwassers für die Innenentzunderung über ein vom Stopfen (5,6) gesteuertes mechanisch zu- und abschaltbares Ventil (13,17) zugeleitet wird, das von der in Rohrachsrichtung aufgebrachten Umformkraft beaufschlagt gegen den anstehenden Systemdruck des Druckwassers (1) öffnet und beiClaim 1, characterized in that the pressure water for the internal descaling is supplied via a valve (13, 17) which can be mechanically switched on and off by the stopper (5, 6) and which is acted upon by the forming force applied in the pipe axis direction against the system pressure of the pressure water ( 1) opens and at
Wegfall der auf den Stopfen (5,6) wirkenden Umformkraft durch denElimination of the forming force acting on the stopper (5,6) by the
Systemdruck des Druckwassers (1) schließt.System pressure of the pressurized water (1) closes.
3. Vorrichtung zum Innenentzundern des Vorrohres nach Anspruch 2, dadurch gekennzeichnet, daß das Ventil (13,17) koaxial zur Stopfenstange (2) zwischen dieser und dem Stopfen (5,6) angeordnet ist.3. Device for descaling the inner tube according to claim 2, characterized in that the valve (13, 17) is arranged coaxially to the plug rod (2) between the latter and the plug (5, 6).
4. Vorrichtung zum innenentzundern des Vorrohres nach Anspruch 2 und 3, dadurch gekennzeichnet, daß dem Systemdruck des Druckwassers (1) zum Schließen des Ventils (13,17) eine auf das Ventil wirkende Druckfeder zugeordnet ist. 4. Device for descaling the inner tube according to claim 2 and 3, characterized in that the system pressure of the pressurized water (1) for closing the valve (13, 17) is assigned a compression spring acting on the valve.
PCT/DE1998/003749 1997-12-23 1998-12-16 Method and device for descaling pipes WO1999033588A1 (en)

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DE1997158388 DE19758388C1 (en) 1997-12-23 1997-12-23 Device for descaling pipes
DE19758388.1 1997-12-23

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WO2011083101A3 (en) * 2010-01-07 2011-09-22 New Seamless Tube Technology Corp. Hot rolling of metal tubes without welded joints on a continuous mill with a fixed mandrel
RU2564198C2 (en) * 2013-08-07 2015-09-27 Открытое акционерное общество "Синарский трубный завод" (ОАО "СинТЗ") Cleaning method of inner and outer surfaces of tubes

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