[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

EP0067906A2 - Method for the production of seamless copper pipes - Google Patents

Method for the production of seamless copper pipes Download PDF

Info

Publication number
EP0067906A2
EP0067906A2 EP81110522A EP81110522A EP0067906A2 EP 0067906 A2 EP0067906 A2 EP 0067906A2 EP 81110522 A EP81110522 A EP 81110522A EP 81110522 A EP81110522 A EP 81110522A EP 0067906 A2 EP0067906 A2 EP 0067906A2
Authority
EP
European Patent Office
Prior art keywords
water
tube
pipe
mandrel
rolled
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.)
Withdrawn
Application number
EP81110522A
Other languages
German (de)
French (fr)
Other versions
EP0067906A3 (en
Inventor
Otto Uhlmann
Klaus-Peter Ing.Grad. Uhlmann
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.)
KM Kabelmetal AG
Original Assignee
KM Kabelmetal 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 KM Kabelmetal AG filed Critical KM Kabelmetal AG
Publication of EP0067906A2 publication Critical patent/EP0067906A2/en
Publication of EP0067906A3 publication Critical patent/EP0067906A3/en
Withdrawn legal-status Critical Current

Links

Images

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
    • B21B45/02—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 lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/023—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes by immersion in a bath
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
    • B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B2003/005—Copper or its alloys
    • 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
    • B21B45/02—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 lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B2045/0227—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for tubes
    • 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

Definitions

  • the invention relates to a method for producing seamless copper tubes, in which a red-hot copper block is perforated and stretched by means of a mandrel and two or three inclined rollers, and the rolled tube is introduced into a water basin immediately behind the roller gap.
  • the invention is therefore based on the object of improving the known method in such a way that these inner bubbles no longer arise.
  • the water level of the water basin is lowered at the beginning of the rolling process, so that the rolled tube passes above the level and the tube is sprayed with water from the outside, and that the water level of the water basin is raised, and the beginning of the pipe has emerged from the water tank.
  • the measures according to the invention ensure that no water can enter the open pipe end. External oxidation of the pipe at a point in time when the water level in the water basin is reduced is avoided by spraying with water.
  • the rolled tube is passed through water nozzles arranged at a distance from one another, which spray water onto the tube only when the beginning of the tube has passed through them.
  • a protective gas into the inside of the pipe.
  • This protective gas prevents harmful oxygen from reaching the area in front of the mandrel tip, which, like water vapor, would lead to errors there.
  • the protective gas is introduced through the mandrel rod provided with a longitudinal channel.
  • the invention further relates to a device for carrying out the method, which consists of a pair of diagonal rollers, a mandrel attached to a mandrel bar and a water box arranged behind the roll gap as viewed in the direction of passage.
  • a device for carrying out the method which consists of a pair of diagonal rollers, a mandrel attached to a mandrel bar and a water box arranged behind the roll gap as viewed in the direction of passage.
  • annular spray nozzles which are arranged at a distance from one another are arranged directly behind the roll gap and means are provided on the water tank which make it possible to quickly lower and raise the water level.
  • a copper block 1 is inserted into the roll gap formed by the rollers 2 by means of a plunger (not shown).
  • the rollers 2 are arranged in a roll stand 3. They are slightly inclined so that the copper block 1 is transported further by them and at the same time is rotated about its longitudinal axis.
  • a mandrel 4, which is fastened to a mandrel rod 6, projects into the roll gap.
  • the mandrel rod is guided in a plurality of guides in a manner not shown and fastened to a mandrel rod holder 7.
  • the copper block 1 is rolled over the mandrel 4, so that a tube is formed. After completion of the tube, the mandrel rod 6 is pulled out of the tube with the mandrel 4 and this is thrown off to the side.
  • the tube In order to prevent oxidation of the surface of the tube emerging from the roll gap, the tube enters a water box 8. At the beginning of the rolling process, the water level in the water box 8 is lowered so that the tube does not come into contact with the water in the water box 8.
  • the cooling of the pipe is carried out by several nozzles 5, each of which is switched on as soon as the beginning of the pipe has passed through it. It is essential that no water can penetrate into the interior of the pipe.
  • the last spray nozzle 5 viewed in the direction of flow, which is arranged in the partition 9
  • the water level in the water tank 8 is raised rapidly (dashed line), and the middle nozzles 5 are switched off.
  • the first and last nozzles seen in the direction of flow remain switched on in order to prevent water from escaping from the passage openings.
  • An opening 10, which is connected to a powerful pump, is used for accelerated filling and emptying in the water tank 8.
  • a drain 11 ensures that the water dripping from the pipe can drain.
  • the mandrel rod 6 has an inert gas connection 12, through which inert gas z. B. nitrogen is introduced into the interior of the tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

In the production of copper pipes from copper ingots by means of a hot crossrolling mill, the emerging pipe is rolled directly in water to prevent oxidation of the outer surface. In order to avoid bubbles on the inner wall of the rolled pipe, the cooling is controlled so that the rolled pipe comes into contact with the cooling water only on its outer surface. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zur Herstellung nahtloser Kupferrohre, bei dem ein rotglühender Kupferblock mittels eines Dornes und zwei oder drei schräg gestellter Walzen gelocht und gestreckt wird, und das gewalzte Rohr unmittelbar hinter dem Walzspalt in ein Wasserbecken eingeführt wird.The invention relates to a method for producing seamless copper tubes, in which a red-hot copper block is perforated and stretched by means of a mandrel and two or three inclined rollers, and the rolled tube is introduced into a water basin immediately behind the roller gap.

Bei einem bekannten Verfahren (DE-OS 2 356 985) wird das aus dem Walzspalt austretende Kupferrohr in ein unmittelbar hinter dem Walzenpaar angeordnetes Wasserbecken eingeführt. Auf diese Weise wird ein Kupferrohr mit oxidfreier Oberfläche erhalten. Der wesentliche Vorteil dieses Verfahrens liegt darin, daß auf aufwendige und umweltschädliche Beizvorgänge, um die Oxidschicht zu entfernen, verzichtet werden kann.In a known method (DE-OS 2 356 985), the copper pipe emerging from the roll gap is introduced into a water basin arranged directly behind the pair of rolls. In this way, a copper tube with an oxide-free surface is obtained. The main advantage of this method lies in the fact that elaborate and environmentally harmful pickling processes in order to remove the oxide layer can be dispensed with.

Es hat sich jedoch gezeigt, daß unter bestimmten Umständen die gewalzten Rohre an ihrer inneren Oberfläche Blasen aufweisen, die bei den nachfolgenden Arbeitsgängen, wie Pilgern und Ziehen zu Rohrabrissen führen. Die Ursache für diese Blasen wird darin gesehen, daß aus dem Wasserbecken Wasser in das offene Rohrende eintreten kann und bis in die unmittelbare Nähe des Dornes strömt und dort verdampft. Wenn nun aufgrund der großen Beanspruchungen der Metallblock vor der Dornspitze aufreißt, kann Wasserdampf in diesen Bereich eindringen und dort zu Blasen führen.However, it has been shown that under certain circumstances the Rolled pipes have blisters on their inner surface, which lead to pipe breaks in subsequent operations such as pilgrimage and drawing. The cause of these bubbles is seen in the fact that water can enter the open pipe end from the water basin and flow into the immediate vicinity of the mandrel and evaporate there. If the metal block in front of the mandrel tip tears open due to the high loads, water vapor can penetrate into this area and lead to bubbles.

Der Erfindung liegt von daher die Aufgabe zugrunde, das bekannte Verfahren dahingehend zu verbessern, daß diese Innenblasen nicht mehr entstehen.The invention is therefore based on the object of improving the known method in such a way that these inner bubbles no longer arise.

Diese Aufgabe wird dadurch gelöst, daß gemäß der Erfindung der Wasserstand des Wasserbeckens zu Beginn des Walzvorgangs abgesenkt ist, so daß das gewalzte Rohr oberhalb des Pegels durchläuft, und das Rohr von außen mit Wasser besprüht wird, und daß der Wasserstand des Wasserbeckens angehoben wird, sowie der Rohranfang aus dem Wasserkasten ausgetreten ist.This object is achieved in that, according to the invention, the water level of the water basin is lowered at the beginning of the rolling process, so that the rolled tube passes above the level and the tube is sprayed with water from the outside, and that the water level of the water basin is raised, and the beginning of the pipe has emerged from the water tank.

Durch die erfindungsgemäßen Maßnahmen ist sichergestellt, daß kein Wasser in das offene Rohrende eintreten kann. Eine äußere Oxidation des Rohres zu einem Zeitpunkt, in dem der Wasserstand des Wasserbeckens abgesenkt ist, wird durch das Besprühen mit Wasser vermieden.The measures according to the invention ensure that no water can enter the open pipe end. External oxidation of the pipe at a point in time when the water level in the water basin is reduced is avoided by spraying with water.

Nach einer besonders vorteilhaften Ausgestaltung des erfindungsgemäßen Verfahrens ist vorgesehen, daß das gewalzte Rohr durch in Abstand zueinander angeordnete Wasserdüsen hindurchgeführt wird, die erst dann Wasser auf das Rohr sprühen, wenn der Rohranfang jeweils durch sie durchgetreten ist. Eine noch bessere Qualität der inneren Rohroberfläche erhält man, wenn man in das Rohrinnere ein Schutzgas einleitet. Dieses Schutzgas verhindert, daß schädlicher Sauerstoff in den Bereich vor der Dornspitze gelangt, der dort ähnlich wie Wasserdampf zu Fehlern führen würde. In besonders zweckmäßiger Weise wird das Schutzgas durch die mit einem Längskanal versehene Dornstange eingeleitet.According to a particularly advantageous embodiment of the method according to the invention, it is provided that the rolled tube is passed through water nozzles arranged at a distance from one another, which spray water onto the tube only when the beginning of the tube has passed through them. An even better quality of the inner pipe surface can be obtained by introducing a protective gas into the inside of the pipe. This protective gas prevents harmful oxygen from reaching the area in front of the mandrel tip, which, like water vapor, would lead to errors there. In a particularly expedient manner, the protective gas is introduced through the mandrel rod provided with a longitudinal channel.

Die Erfindung betrifft weiterhin eine Vorrichtung zur Durchführung des Verfahrens, die aus einem Schrägwalzenpaar, einem an einer Dornstange befestigten Dorn sowie einem in Durchlaufrichtung gesehen hinter dem Walzspalt angeordneten Wasserkasten besteht. In Abänderung der bekannten Vorrichtung sind unmittelbar hinter dem Walzspalt in Abstand zueinander angeordnete ringförmige Sprühdüsen angeordnet und am Wasserkasten Mittel vorgesehen, die ein rasches Absenken und Anheben des Wasserstandes möglich machen.The invention further relates to a device for carrying out the method, which consists of a pair of diagonal rollers, a mandrel attached to a mandrel bar and a water box arranged behind the roll gap as viewed in the direction of passage. In a modification of the known device, annular spray nozzles which are arranged at a distance from one another are arranged directly behind the roll gap and means are provided on the water tank which make it possible to quickly lower and raise the water level.

Die Erfindung ist an Hand des in der Fig. dargestellten Ausführungsbeispiels näher erläutert.The invention is explained in more detail with reference to the embodiment shown in the figure.

Mittels eines nicht dargestellten Stößels wird ein Kupferblock 1 in den durch die Walzen 2 gebildeten Walzspalt eingeschoben. Die Walzen 2 sind in einem Walzgerüst 3 angeordnet. Sie sind leicht schräg gestellt, so daß der Kupferblock 1 von ihnen weitertransportiert und dabei gleichzeitig um seine Längsachse gedreht wird. In den Walzspalt ragt ein Dorn 4 hinein, der an einer Dornstange 6 befestigt ist. Die Dornstange ist in nicht dargestellter Weise in mehreren Führungen geführt und an einem Dornstangenhalter 7 befestigt. Der Kupferblock 1 wird über den Dorn 4 gewalzt, so daß ein Rohr entsteht. Nach Fertigstellung des Rohres wird die Dornstange 6 mit dem Dorn 4 aus dem Rohr gezogen und dieses seitlich abgeworfen.A copper block 1 is inserted into the roll gap formed by the rollers 2 by means of a plunger (not shown). The rollers 2 are arranged in a roll stand 3. They are slightly inclined so that the copper block 1 is transported further by them and at the same time is rotated about its longitudinal axis. A mandrel 4, which is fastened to a mandrel rod 6, projects into the roll gap. The mandrel rod is guided in a plurality of guides in a manner not shown and fastened to a mandrel rod holder 7. The copper block 1 is rolled over the mandrel 4, so that a tube is formed. After completion of the tube, the mandrel rod 6 is pulled out of the tube with the mandrel 4 and this is thrown off to the side.

Um eine Oxidation der Oberfläche des aus dem Walzspalt austretenden Rohres zu verhindern, tritt das Rohr in einen Wasserkasten 8 ein. Zu Beginn des Walzvorganges ist der Wasserstand im Wasserkasten 8 so weit abgesenkt, daß das Rohr nicht mit dem Wasser im Wasserkasten 8 in Berührung kommt. Die Kühlung des Rohres wird von mehreren Düsen 5 übernommen, von denen jede angeschaltet wird, sowie der Rohranfang diese passiert hat. Wesentlich dabei ist, daß kein Wasser in das Rohrinnere dringen kann. Hat der Rohranfang die in Durchlaufrichtung gesehen letzte Sprühdüse 5 passiert, die in der Trennwand 9 angeordnet ist, wird der Wasserstand im Wasserkasten 8 rasch angehoben (gestrichelte Linie), und die mittleren Düsen 5 werden abgeschaltet. Die in Durchlaufrichtung gesehen erste und letzte Düse bleiben eingeschaltet, um zu verhindern, daß Wasser aus den Durchtrittsöffnungen austritt. Zur beschleunigten Füllung und Entleerung im Wasserkasten 8 dient eine Öffnung 10, die an eine leistungsstarke Pumpe angeschlossen ist. Ein Abfluß 11 sorgt dafür, daß das von dem Rohr abtropfende Wasser ablaufen kann. Um zu verhindern, daß Sauerstoff in das Rohrinnere und insbesondere in den Bereich vor der Dornspitze gelangen kann, weist die Dornstange 6 einen Schutzgasanschluß 12 auf, durch den Schutzgas z. B. Stickstoff in das Innere des Rohres eingeleitet wird.In order to prevent oxidation of the surface of the tube emerging from the roll gap, the tube enters a water box 8. At the beginning of the rolling process, the water level in the water box 8 is lowered so that the tube does not come into contact with the water in the water box 8. The cooling of the pipe is carried out by several nozzles 5, each of which is switched on as soon as the beginning of the pipe has passed through it. It is essential that no water can penetrate into the interior of the pipe. When the beginning of the tube has passed the last spray nozzle 5, viewed in the direction of flow, which is arranged in the partition 9, the water level in the water tank 8 is raised rapidly (dashed line), and the middle nozzles 5 are switched off. The first and last nozzles seen in the direction of flow remain switched on in order to prevent water from escaping from the passage openings. An opening 10, which is connected to a powerful pump, is used for accelerated filling and emptying in the water tank 8. A drain 11 ensures that the water dripping from the pipe can drain. In order to prevent oxygen from getting into the interior of the tube and in particular into the area in front of the mandrel tip, the mandrel rod 6 has an inert gas connection 12, through which inert gas z. B. nitrogen is introduced into the interior of the tube.

Mit Hilfe des erfindungsgemäßen Verfahrens ist es gelungen, Kupferblöcke zu Rohren zu verwalzen, die eine oxidationsfreie äußere Oberfläche und eine innere Oberfläche, die frei'von Blasen ist, aufweisen.With the aid of the method according to the invention, it has been possible to roll copper blocks into tubes which have an oxidation-free outer surface and an inner surface which is free from bubbles.

Claims (5)

1. Verfahren zur Herstellung nahtloser Kupferrohre, bei dem ein rotglühender Kupferblock mittels eines Dornes und zwei oder drei schräg gestellter Walzen gelocht und gestreckt wird, und das gewalzte Rohr unmittelbar hinter dem Walzspalt in ein Wasserbecken eingeführt wird, dadurch qekennzeichnet, daß der Wasserstand des Wasserbeckens zu Beginn des Walzvorgangs abgesenkt ist, so daß das gewalzte Rohr oberhalb des Pegels durchläuft, und das Rohr von außen mit Wasser besprüht wird und daß der Wasserstand des Wasserbeckens angehoben wird, sowie - der Rohranfang aus dem Wasserkasten ausgetreten ist.1. A process for producing seamless copper pipes, in which a red-hot copper block is punched and stretched by means of a mandrel and two or three inclined rolls, and the rolled pipe is inserted into a water basin immediately behind the roll gap, characterized in that the water level of the water basin is lowered at the beginning of the rolling process, so that the rolled pipe passes above the level, and the pipe is sprayed with water from the outside and that the water level of the water basin is raised, and - the pipe start has emerged from the water tank. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das gewalzte Rohr durch in Abstand zueinander angeordnete Wasserdüsen hindurchgeführt wird, die erst dann Wasser auf das Rohr sprühen, wenn der Rohranfang jeweils durch sie durchgetreten ist.2. The method according to claim 1, characterized in that the rolled tube is passed through spaced-apart water nozzles which spray water onto the tube only when the beginning of the tube has passed through them. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß in das Rohrinnere ein Schutzgas eingeleitet wird.3. The method according to claim 1 or 2, characterized in that a protective gas is introduced into the interior of the tube. 4. Verfahren nach Anspruch 3, dadurch qekennzeichnet, daß das Schutzgas durch die mit einem Längskanal versehene Dornstange eingeleitet wird.4. The method according to claim 3, characterized in that the protective gas is introduced through the mandrel rod provided with a longitudinal channel. 5. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 oder einem der folgenden, bestehend aus einem Schrägwalzenpaar, einem an einer Dornstange befestigten Dorn, einem in Durchlaufrichtung gesehen hinter dem Walzspalt angeordneten Wasserkasten, dadurch aekennzeichnet, daß unmittelbar hinter dem Walzspalt in Abstand zueinander angeordnete ringförmige Sprühdüsen (5) angeordnet sind und am Wasserkasten (8) Mittel (10) vorgesehen sind, die ein rasches Absenken und Anheben des Wasserstandes möglich machen.5. Apparatus for carrying out the method according to claim 1 or one of the following, consisting of a pair of diagonal rollers, a mandrel attached to a mandrel rod, a water box arranged behind the roll gap in the direction of flow, characterized in that ae arranged immediately behind the roll gap at a distance from each other Spray nozzles (5) are arranged and means (10) are provided on the water tank (8) which make it possible to quickly lower and raise the water level.
EP81110522A 1981-06-15 1981-12-17 Method for the production of seamless copper pipes Withdrawn EP0067906A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813123645 DE3123645A1 (en) 1981-06-15 1981-06-15 "METHOD FOR PRODUCING SEAMLESS COPPER PIPES"
DE3123645 1981-06-15

Publications (2)

Publication Number Publication Date
EP0067906A2 true EP0067906A2 (en) 1982-12-29
EP0067906A3 EP0067906A3 (en) 1983-03-30

Family

ID=6134728

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81110522A Withdrawn EP0067906A3 (en) 1981-06-15 1981-12-17 Method for the production of seamless copper pipes

Country Status (2)

Country Link
EP (1) EP0067906A3 (en)
DE (1) DE3123645A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6651473B2 (en) * 2001-02-17 2003-11-25 Sms Meer Gmbh Cold-rolling seamless copper tubing
CN101994875B (en) * 2009-08-25 2012-08-22 山东中佳新材料有限公司 Method for manufacturing seamless copper pipe and rod core used for cold rolling mill
CN105436220A (en) * 2015-12-01 2016-03-30 成都睿达致祥科技有限公司 Oil removing device for inner hole of cold reducing mill
CN110695092A (en) * 2019-10-23 2020-01-17 广东海亮铜业有限公司 Uninterrupted nitrogen purging system
CN111417471A (en) * 2017-11-29 2020-07-14 日本制铁株式会社 Manufacturing method of seamless steel pipe

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19604969C2 (en) * 1996-02-02 2000-08-24 Sms Demag Ag Process for the production of seamless pipes and internal tools
CN102773303B (en) * 2012-07-16 2014-07-30 中国船舶重工集团公司第七二五研究所 Copper nickel alloy large-size thick-wall seamless pipe manufacturing process
DE102019205724A1 (en) 2019-04-18 2020-10-22 Sms Group Gmbh Cooling device for seamless steel pipes

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE744177C (en) * 1939-05-24 1944-01-11 Dr Fritz Singer Process for the cold forming of metal pipes that have been coated with oxide and ignition layers after the previous annealing treatment
CH339897A (en) * 1954-12-01 1959-07-31 Ici Ltd Process for the production of copper wire coated with aluminum
US3036825A (en) * 1957-05-17 1962-05-29 Eisenmenger Friedrich Process and apparatus for the continuous heat treating of elongated material
BE672269A (en) * 1964-11-12 1900-01-01
DE2054528C3 (en) * 1970-11-05 1981-07-23 Vsesojuznyj naučno-issledovatel'skij i konstruktorsko-technologičeskij institut trubnoj promyšlennosti, Dnepropetrovsk Device for hardening pipes from the rolling heat
DE2356985A1 (en) * 1973-11-15 1975-05-22 Kabel Metallwerke Ghh Hot-rolled seamless metal tubes mfr. - esp. of copper and copper alloys, using water or gas to prevent oxidn
FR223577A (en) * 1973-12-11
DE2506418A1 (en) * 1975-02-15 1976-08-26 Kabel Metallwerke Ghh METAL PIPE HOT ROLLING METHOD

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6651473B2 (en) * 2001-02-17 2003-11-25 Sms Meer Gmbh Cold-rolling seamless copper tubing
CN101994875B (en) * 2009-08-25 2012-08-22 山东中佳新材料有限公司 Method for manufacturing seamless copper pipe and rod core used for cold rolling mill
CN105436220A (en) * 2015-12-01 2016-03-30 成都睿达致祥科技有限公司 Oil removing device for inner hole of cold reducing mill
CN105436220B (en) * 2015-12-01 2018-02-16 青岛华仁技术孵化器有限公司 A kind of cold pilger mill endoporus degreaser
CN111417471A (en) * 2017-11-29 2020-07-14 日本制铁株式会社 Manufacturing method of seamless steel pipe
EP3718654A4 (en) * 2017-11-29 2021-09-08 Nippon Steel Corporation METHOD OF MANUFACTURING SEAMLESS STEEL PIPE
US11471923B2 (en) 2017-11-29 2022-10-18 Nippon Steel Corporation Production method of seamless steel pipe
CN110695092A (en) * 2019-10-23 2020-01-17 广东海亮铜业有限公司 Uninterrupted nitrogen purging system
CN110695092B (en) * 2019-10-23 2024-06-04 广东海亮铜业有限公司 Uninterrupted nitrogen purging system

Also Published As

Publication number Publication date
DE3123645A1 (en) 1982-12-30
EP0067906A3 (en) 1983-03-30
DE3123645C2 (en) 1992-06-04

Similar Documents

Publication Publication Date Title
DE3432288C2 (en) Use of inert gas in the manufacture of seamless pipes
DE2256024A1 (en) PROCESS FOR ROLLING HOT METAL WORKS
EP1113888B1 (en) Method and device for producing a hot-rolled steel strip from molten steel
EP0067906A2 (en) Method for the production of seamless copper pipes
EP1900449B1 (en) Spray header of a hydraulic descaling facility and method for operating such a spray header
WO2013000841A1 (en) Method for strand casting a cast strand, and strand casting system
DE2311473A1 (en) DEVICE AND METHOD FOR HOT-GALVANIZING PIPE MATERIAL
DE2559038A1 (en) METHOD AND DEVICE FOR CONTINUOUS STEEL CASTING
DE2420347C3 (en) Device for the production of copper wire
DE2049846A1 (en) Machining processes for copper and alloys containing copper
DE2354094A1 (en) METHOD FOR TREATMENT OF CONTINUOUS COPPER CASTING AND DEVICE FOR CARRYING OUT THE METHOD
DE3405641C2 (en)
DE3335942A1 (en) METHOD AND DEVICE FOR RETURNING THE PINS OF A PLUG ROLLING MILL FOR PRODUCING SEAMLESS TUBES
DE830387C (en) Method and device for continuous casting of a metal strand
DE2356985A1 (en) Hot-rolled seamless metal tubes mfr. - esp. of copper and copper alloys, using water or gas to prevent oxidn
DE10316910B3 (en) Production of metallic pipes comprises rolling the start of the pipe loop and/or the end of the pipe loop together using an inner tool
DE2401626C3 (en) Device for descaling a metal wire
EP3623074A1 (en) Method for the preparation of long products which are close to final dimensions and a continuous casting and rolling installation for carrying out the method
DE2257592A1 (en) METHOD AND DEVICE FOR REMOVAL IN THE HOT CONDITION AND COOLING OF ROLLED WIRE OR THE LIKE. AT THE EXIT FROM A ROLLING MILL
DE1807321A1 (en) Process and system for the hot production of round hollow billets from a continuously cast hollow steel block
DE3710450A1 (en) METHOD AND DEVICE FOR COOLING ROLLING GOODS IN WATER COOLING ROUTES
EP0787542A2 (en) Mandrel and mandrel bar for skew-rolling mills
DE2102800B2 (en) PLANT FOR THE THERMAL TREATMENT OF ROLLED PRODUCTS IN THE COOLANT FLOW
WO2022058152A1 (en) Method and spraying apparatus for thermal surface treatment of a metal product
DE2213984C2 (en) Steel bar spraying equipment - has mixing chamber for compressed-air and rust-protecting agent before annular gap

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH FR GB IT LI NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

AK Designated contracting states

Designated state(s): AT BE CH FR GB IT LI NL SE

18W Application withdrawn

Withdrawal date: 19830216

RIN1 Information on inventor provided before grant (corrected)

Inventor name: UHLMANN, KLAUS-PETER, ING.GRAD.

Inventor name: UHLMANN, OTTO