EP0423378A1 - Method of continuously drawing metal tubes - Google Patents

Method of continuously drawing metal tubes Download PDF

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Publication number
EP0423378A1
EP0423378A1 EP89119100A EP89119100A EP0423378A1 EP 0423378 A1 EP0423378 A1 EP 0423378A1 EP 89119100 A EP89119100 A EP 89119100A EP 89119100 A EP89119100 A EP 89119100A EP 0423378 A1 EP0423378 A1 EP 0423378A1
Authority
EP
European Patent Office
Prior art keywords
pipe
region
wall thickness
connection point
die
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
EP89119100A
Other languages
German (de)
French (fr)
Other versions
EP0423378B1 (en
Inventor
Ulrich Dr.-Ing. Reiter
Theodor Ing. Niggemann (Grad)
Peter Dipl.-Ing. Tietz
Georg Ing. Wischmeyer (Grad)
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 Europa Metal AG
Original Assignee
KM Kabelmetal AG
KM Europa Metal 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, KM Europa Metal AG filed Critical KM Kabelmetal AG
Publication of EP0423378A1 publication Critical patent/EP0423378A1/en
Application granted granted Critical
Publication of EP0423378B1 publication Critical patent/EP0423378B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
    • B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
    • B21C1/24—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles by means of mandrels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Extraction Processes (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

In the continuous drawing of, for example, seamless metal tubes joined together by butt welding, the joints generally do not have the required strength to transmit the drawing forces occurring during the drawing process. The method according to the invention first of all brings the joints up to the same strength as the adjoining tube material and then draws the total length produced to a uniform wall thickness. The equal strength can here preferably be achieved by heat treatment in the region of the joints.

Description

Die Erfindung betrifft ein Verfahren nach dem Oberbegriff des Patentanspruchs 1. Ein solches Verfahren ist aus der DE-PS 37 39 730 bekannt.The invention relates to a method according to the preamble of claim 1. Such a method is known from DE-PS 37 39 730.

Bei der Herstellung von nahtlosen Metallrohren geht man üb­licherweise von gegossenen Blöcken aus, die dann durch Pressen oder Warmwalzen zu Vorrohren weiterverarbeitet werden. In einem anschließenden Fertigungsschritt werden diese Vorrohre in einem Kaltpilgerwalzwerk sowohl in der Wanddicke als auch im Außendurchmesser reduziert. Das gepilgerte Rohr wird dann in mehreren Zügen mit Hilfe von Matrizen und innerhalb des Metallrohrs angeordneten Dornen auf das Endmaß heruntergezo den. Zur Vorbereitung eines jeden Zugs muß ein Dorn sowie Ziehöl in das Metallrohr eingeführt werden. Anschließend wird der Rohranfang angespitzt, damit er durch die Ziehmatrize der Ziehmaschine geführt werden kann. Bei mehreren Zügen sind diese Vorbereitungsarbeiten mehrfach durchzuführen, wobei zusätzlich noch der angespitzte Rohrbereich aus dem voran­gehenden Zug abgetrennt werden muß. Zur Vermeidung dieser Nachteile hat man schon versucht, einzelne Rohrlängen vor dem Ziehen untereinander fest zu verbinden, zum Beispiel durch Stumpfschweißen der Enden der Rohrlängen. Es hat sich jedoch gezeigt, daß die Verbindungsstellen der einzelnen Rohrlängen nicht die erforderliche Festigkeit aufweisen, um die beim Ziehprozeß auftretenden Ziehkräfte zu übertragen. Zur Ent­lastung der Verbindungsstellen während des Ziehens sieht das bekannte Verfahren vor, im Bereich der Verbindungsstellen über eine bestimmte Länge einen Hohlzug durchzuführen, daß heißt, während dieser Zeit das Rohr ohne Wanddickenreduzierung zu ziehen. Dies führt dazu, daß die Wanddicke in einem relativ langen Bereich jeweils größer ist als bei der restlichen Rohr­länge. Erschwerend kommt hinzu, daß bei aufeinanderfolgenden Zügen die Verbindungsstellen sicher erkannt werden müssen, damit in diesem Bereich ein weiterer Hohlzug ohne Wanddicken­reduzierung erfolgen kann.In the manufacture of seamless metal pipes, one usually starts with cast blocks, which are then further processed into pre-pipes by pressing or hot rolling. In a subsequent manufacturing step, these front pipes are reduced in both the wall thickness and the outside diameter in a cold pilger rolling mill. The pilgrimed tube is then pulled down to the final dimension in several moves using dies and mandrels arranged within the metal tube. To prepare each train, a mandrel and drawing oil must be inserted into the metal pipe. The pipe start is then pointed so that it can be passed through the drawing die of the drawing machine. In the case of several trains, this preparatory work has to be carried out several times, with the pointed pipe area also having to be separated from the previous train. In order to avoid these disadvantages, attempts have already been made to firmly connect individual tube lengths to one another before drawing, for example by butt welding the ends of the tube lengths. However, it has been shown that the connection points of the individual pipe lengths do not have the strength required to transmit the drawing forces that occur during the drawing process. In order to relieve the pressure on the connection points during drawing, the known method provides for a hollow pull to be made over a certain length in the area of the connection points, that is to say during this time the pipe is pulled without reducing the wall thickness. This causes the wall thickness to be relative long area is larger than the remaining pipe length. To make matters worse, in the case of successive trains, the connection points must be reliably recognized so that a further hollow train can take place in this area without reducing the wall thickness.

Neben einer entsprechenden Werkzeugausführung ist hierzu ein erheblicher regelungstechnischer Aufwand erforderlich. Am Ende des Fertigungsprozesses müssen die Verbindungsstellen aus der Fertigungslänge herausgeschnitten werden und fallen als Abfall an.In addition to a corresponding tool design, this requires considerable control engineering effort. At the end of the manufacturing process, the connection points have to be cut out of the production length and are generated as waste.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum kontinuierlichen Ziehen von Metallrohren anzugeben, bei wel­chem die gesamte Fertigungslänge ohne großen regelungstech­nischen Aufwand mit der gleichen Wanddickenreduzierung ge­zogen werden kann.The invention is based on the object of specifying a method for the continuous drawing of metal pipes, in which the entire production length can be drawn with the same reduction in wall thickness without great control expenditure.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Verbindungsstellen zwischen den Rohrlängen durch geeignete Maßnahmen zunächst auf den nahezu gleichen Festigkeitszustand gebracht werden wie der jeweils unmittelbar angrenzende Rohr­werkstoff, und daß dann die Rohrlängen einschließlich der Ver­bindungsstellen auf eine einheitliche Wanddicke gezogen werden.This object is achieved in that the connection points between the pipe lengths are first brought to almost the same strength state by suitable measures as the respectively immediately adjacent pipe material, and that the pipe lengths including the connection points are then drawn to a uniform wall thickness.

Der wesentliche Vorteil des erfindungsgemäßen Verfahrens be­steht darin, daß die Leistung einer Ziehanlage erheblich ge­steigert werden kann, ohne daß ein großer regelungstechnischer Aufwand getrieben werden muß, beziehungsweise unbrauchbares Rohrmaterial mit größerer Wanddicke anfällt.The main advantage of the method according to the invention is that the performance of a drawing system can be increased considerably without a great deal of control engineering having to be carried out or unusable tube material having a greater wall thickness.

Nach einer besonders vorteilhaften Ausgestaltung der Erfindung wird das Metallrohr im Bereich der Verbindungsstellen weichge­glüht. Da die erforderliche Zugkraft unter anderem von dem Festigkeitszustand des umzuformenden Materials abhängig ist, kann man davon ausgehen, daß bei weichgeglühtem Material eine geringere Zugkraft notwendig ist als bei hartgezogenem Mate­rial. Durch die spezielle Wärmebehandlung der Metallrohrlängen im Bereich der Verbindungsstelle erhält ein vorbestimmtes Ge­biet den Festigkeitszustand der Verbindungsstelle, beispiels­weise die Zugfestigkeit einer unverfestigten Schweißnaht. Beim nachfolgenden ersten Zug werden die Verbindungsstellen dann nur mit der sehr viel geringeren Umformkraft für weichgeglühtes Material belastet. Überraschenderweise hat sich herausgestellt, daß die Verbindungsstellen zwischen den Rohrlängen die erfor­derliche Festigkeit aufweisen und beim Ziehen mit fliegendem Dorn bei üblichen Querschnittsabnahmen von etwa 30 bis 40 % nicht reißen. Zur Verringerung der zu übertragenden Ziehkräfte kann vorzugsweise im Bereich der Verbindungsstellen mit vermin­derter Ziehgeschwindigkeit gezogen werden. Diese Sicherheits­maßnahme wird im allgemeinen jedoch nur beim ersten Zug nach Verbindung der Rohrlängen erforderlich sein.According to a particularly advantageous embodiment of the invention, the metal tube is soft-annealed in the area of the connection points. Since the required tensile force depends, among other things, on the strength of the material to be formed, it can be assumed that a lower tensile force is required for soft-annealed material than for hard-drawn material. Due to the special heat treatment of the metal pipe lengths in the area of the connection point, a predetermined area receives the strength state of the connection point, for example the tensile strength of an unconsolidated weld seam. In the subsequent first pull, the connection points are then only loaded with the much lower forming force for annealed material. Surprisingly, it has been found that the connection points between the tube lengths have the required strength and do not tear when pulling with a flying mandrel with a typical cross-sectional decrease of about 30 to 40%. To reduce the pulling forces to be transmitted, pulling can preferably be carried out in the area of the connection points with a reduced pulling speed. However, this safety measure will generally only be necessary on the first train after connecting the pipe lengths.

Alternativ kann ein nahezu gleicher Festigkeitszustand von Verbindungsstelle und unmittelbar angrenzendem hartgezogenem bereich vorteilhaft auch dadurch erreicht werden, daß die Ver­bindungsstelle einer lokalen Kaltverformung unterzogen wird.Alternatively, an almost identical strength state of the connection point and the immediately adjacent hard drawn area can advantageously also be achieved by subjecting the connection point to a local cold deformation.

Claims (5)

1. Verfahren zum kontinuierlichen Ziehen von nahtlosen Metall­rohren, mit einem innerhalb des Metallrohrs angeordneten Dorn und einer den Außendurchmesser des Rohrs reduzierenden Matrize, bei welchem die Wanddicke durch Zusammenwirken von Dorn und Matrize verringert wird und eine Ziehkraft an dem gezogenen Rohr hinter der Matrize angreift und wobei min­destens zwei Rohrlängen vor dem Ziehen an ihren unverform­ten Enden miteinander verbunden werden, dadurch ge­kennzeichnet, daß die Verbindungsstellen zwischen den Rohrlängen durch geeignete Maßnahmen zunächst auf den nahezu gleichen Festigkeitszustand gebracht werden wie der jeweils unmittelbar angrenzende Rohrwerkstoff, und daß dann die Rohrlängen einschließlich der Verbindungsstellen auf eine einheitliche Wanddicke gezogen werden.1. A method for the continuous drawing of seamless metal pipes, with a mandrel arranged inside the metal pipe and a die reducing the outside diameter of the pipe, in which the wall thickness is reduced by the interaction of the mandrel and die and a pulling force acts on the drawn pipe behind the die and whereby at least two pipe lengths are joined together at their undeformed ends before drawing, characterized in that the connecting points between the pipe lengths are first brought to almost the same strength state as the respectively directly adjacent pipe material by suitable measures, and then the pipe lengths including the connecting points be drawn to a uniform wall thickness. 2. Verfahren nach Anspruch 1, dadurch gekennzeich­net, daß die Rohrlänge im Bereich der Verbindungsstelle weichgeglüht wird.2. The method according to claim 1, characterized in that the tube length is soft annealed in the region of the connection point. 3. Verfahren nach Anspruch 2, dadurch gekennzeich­net, daß die Verbindungsstelle und der in Ziehrichtung unmittelbar nachfolgende Bereich einer Glühung unterworfen werden.3. The method according to claim 2, characterized in that the connection point and the area immediately following in the drawing direction are subjected to annealing. 4. Verfahren nach Anspruch 1 , dadurch gekennzeich­net, daß die Rohrlänge im Bereich der Verbindungsstelle einer lokalen Kaltverformung unterzogen wird.4. The method according to claim 1, characterized in that the tube length is subjected to a local cold deformation in the region of the connection point. 5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch ge­kennzeichnet, daß die Ziehgeschwindigkeit im Bereich der Verbindungsstellen verringert wird.5. The method according to any one of claims 1 to 4, characterized in that the drawing speed is reduced in the region of the connection points.
EP89119100A 1988-09-27 1989-10-14 Method of continuously drawing metal tubes Expired - Lifetime EP0423378B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3832714A DE3832714C2 (en) 1988-09-27 1988-09-27 Process for the continuous drawing of metal pipes

Publications (2)

Publication Number Publication Date
EP0423378A1 true EP0423378A1 (en) 1991-04-24
EP0423378B1 EP0423378B1 (en) 1995-01-11

Family

ID=6363773

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Application Number Title Priority Date Filing Date
EP89119100A Expired - Lifetime EP0423378B1 (en) 1988-09-27 1989-10-14 Method of continuously drawing metal tubes

Country Status (6)

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EP (1) EP0423378B1 (en)
AT (1) ATE116878T1 (en)
AU (1) AU618139B2 (en)
DE (1) DE3832714C2 (en)
ES (1) ES2065965T3 (en)
GR (1) GR3014923T3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1153671A2 (en) * 2000-05-10 2001-11-14 SMS Demag AG Method for the manufacture of tubes by drawing over a mandrel
US6685082B2 (en) * 2001-10-20 2004-02-03 Nexans Process for continuous production of longitudinally welded metal tubing

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2122935A1 (en) * 1971-05-10 1972-11-23 Stahl- und Röhrenwerk Reisholz GmbH, 4000 Düsseldorf Continuous pipe drawing - using floating plug
NL8200731A (en) * 1982-02-24 1983-09-16 Estel Demka B V Cutting and welding device for steel wire - includes clamping electrodes which separate coils of wire used for reinforced concrete
EP0317905A2 (en) * 1987-11-24 1989-05-31 KM-kabelmetal Aktiengesellschaft Method of drawing weldless tubes

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL86352B1 (en) * 1973-05-30 1976-05-31
DE3739730C1 (en) * 1987-11-24 1988-09-01 Klaus-Peter Dipl-Ing Uhlmann Method for drawing seamless metal tubes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2122935A1 (en) * 1971-05-10 1972-11-23 Stahl- und Röhrenwerk Reisholz GmbH, 4000 Düsseldorf Continuous pipe drawing - using floating plug
NL8200731A (en) * 1982-02-24 1983-09-16 Estel Demka B V Cutting and welding device for steel wire - includes clamping electrodes which separate coils of wire used for reinforced concrete
EP0317905A2 (en) * 1987-11-24 1989-05-31 KM-kabelmetal Aktiengesellschaft Method of drawing weldless tubes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1153671A2 (en) * 2000-05-10 2001-11-14 SMS Demag AG Method for the manufacture of tubes by drawing over a mandrel
EP1153671A3 (en) * 2000-05-10 2002-07-24 SMS Demag AG Method for the manufacture of tubes by drawing over a mandrel
US6685082B2 (en) * 2001-10-20 2004-02-03 Nexans Process for continuous production of longitudinally welded metal tubing

Also Published As

Publication number Publication date
DE3832714A1 (en) 1990-03-29
DE3832714C2 (en) 1998-07-16
AU4376389A (en) 1991-06-13
ATE116878T1 (en) 1995-01-15
ES2065965T3 (en) 1995-03-01
GR3014923T3 (en) 1995-05-31
AU618139B2 (en) 1991-12-12
EP0423378B1 (en) 1995-01-11

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