DE2351316A1 - Cold drawing thin walled weldless tubes - produces accurately concentric bore involves internal mandrel and external die - Google Patents

Cold drawing thin walled weldless tubes - produces accurately concentric bore involves internal mandrel and external die

Info

Publication number
DE2351316A1
DE2351316A1 DE19732351316 DE2351316A DE2351316A1 DE 2351316 A1 DE2351316 A1 DE 2351316A1 DE 19732351316 DE19732351316 DE 19732351316 DE 2351316 A DE2351316 A DE 2351316A DE 2351316 A1 DE2351316 A1 DE 2351316A1
Authority
DE
Germany
Prior art keywords
tube
mandrel
pipe
cold drawing
thin walled
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.)
Pending
Application number
DE19732351316
Other languages
German (de)
Inventor
Walter Langhans
Norbert Stephan
Otto 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
Priority to DE19732351316 priority Critical patent/DE2351316A1/en
Priority to IT5346874A priority patent/IT1021759B/en
Priority to FR7434380A priority patent/FR2247298A1/en
Priority to FI296774A priority patent/FI296774A/fi
Priority to BE149479A priority patent/BE821007A/en
Priority to JP11685274A priority patent/JPS5087950A/ja
Publication of DE2351316A1 publication Critical patent/DE2351316A1/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/30Finishing tubes, e.g. sizing, burnishing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B5/00Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor
    • B23B5/08Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning axles, bars, rods, tubes, rolls, i.e. shaft-turning lathes, roll lathes; Centreless turning
    • B23B5/12Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning axles, bars, rods, tubes, rolls, i.e. shaft-turning lathes, roll lathes; Centreless turning for peeling bars or tubes by making use of cutting bits arranged around the workpiece

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)

Abstract

The tube is firstly not formed from an ingot. The outside surface at one extremity of the tube is turned exactly concentric with the bore. The tube is placed over a fixed mandrel, and an external guide or die fitted with a shaving knife is placed over the tube and is held concentric and axially level with the mandrel. The tube is then drawn between the mandrel and the die and shaving knife assembly. The dimensions and concentricity of the resulting tube are accurately predictable, as the knife cuts the exterior of the tube to leave a surface which is accurately concentric with the interior surface.

Description

225131225131

Kabel- und MetallwerkeCable and metal works

Gutehoffnungshütte Aktiengesellschaft 1-1282Gutehoffnungshütte Aktiengesellschaft 1-1282

10. Okt. 1973Oct 10, 1973

Verfahren zum Herstellen von nahtlosen metallischen RohrenProcess for the production of seamless metallic pipes

Die Erfindung betrifft ein Verfahren zum Herstellen von nahtlosen metallischen Rohren, bei dem zunächst aus einem Block ein Rohr gepreßt oder warmgewalzt wird, das durch Kaltwalzen und/oder Ziehen in seinem Querschnitt verringert wird.The invention relates to a method for producing seamless metallic pipes, in which a pipe is first pressed or hot-rolled from a block, which is produced by cold rolling and / or pulling is reduced in its cross-section.

Nahtlose metallische Rohre werden zum größten Teil in der Weise hergestellt, daß man zunächst einen Block über einen Dorn preßt oder walzt und ggf. das so erhaltene Rohr in bekannter Weise auf den gewünschten Querschnitt bringt.Seamless metallic tubes are for the most part in the way manufactured by first pressing or rolling a block over a mandrel and optionally the tube thus obtained in a known manner brings to the desired cross-section.

Es hat sich gezeigt, daß die auf diese Weise hergestellten Rohre eine exzentrisch gelagerte Bohrung aufweisen. Die Exzentrizitäten treten besonders bei dem stranggepreßten Rohr auf und können durch die nachfolgenden Kaltwalz- bzw. Ziehvorgänge nicht mehr wesentlich beseitigt werden. Die heute üblichen Rohrpressen arbeiten so, daß zunächst in den Aufnehmer ein erwärmter Preßblock eingeführt wird, der mittels des Domes gelocht wird. Anschließend wird der gelochte Preßblock über den Dorn durch eine Matrize hindurchgepreßt. Dabei "schwimmt" sich der Dorn ein. Der Grad der Verlagerung des Dornes zur Matrize ist nicht konstant, beträgt aber im Durchschnitt ca. 10 %. Die Gründe für diese Verlagerung sind im wesentlichen in der Pressenbauart zu suchen bzw. verfahrensbedingt. Bei warmgewalzten Rohren beträgt der Grad der Verlagerung ca. 5 It has been shown that the pipes produced in this way have an eccentrically mounted bore. The eccentricities occur particularly in the extruded tube and can no longer be substantially eliminated by the subsequent cold rolling or drawing processes. The pipe presses commonly used today work in such a way that a heated press block is first inserted into the transducer and punched by means of the dome. The perforated press block is then pressed over the mandrel through a die. The thorn "swims" in the process. The degree of displacement of the mandrel to the die is not constant, but is on average approx. 10 %. The reasons for this relocation are essentially to be found in the type of press or due to the process. In the case of hot-rolled tubes, the degree of displacement is approx. 5 % »

Diese Exzentrizitäten können beim Kaltwalzen und/oder Ziehen nicht wesentlich beseitigt werden.These eccentricities cannot be substantially eliminated in cold rolling and / or drawing.

509 8 17/0105 ORIGINAL INSPECTED509 8 17/0105 ORIGINAL INSPECTED

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren anzugeben, mit dem es möglich ist, nahtlose metallische Rohre erheblich präziser in ihren Abmessungen herzustellen. Diese Aufgabe wird bei einem Verfahren der eingangs erwähnten Art dadurch gelöst, daß gemäß der Erfindung das gepreßte oder warmgewalzte Rohr an einem Ende an der Mantelfläche derart abgedreht wird, daß die Bohrung zentrisch zur Mantelfläche liegt, daß das Rohr von dem abgedrehten Ende aus über einen feststehenden Dorn und eine konzentrisch zum Dorn angeordnete Führung für die Mantelfläche gezogen und dabei kontinuierlich zumindest ein Teil der Mantelfläche des Rohres geschält wird. Mit Hilfe des erfindungsgemäßen Verfahrens ist es nunmehr möglich, Rohre herzustellen, die eine exakt zentrisch gelagerte Bohrung aufweisen. Das abgeschälte Material kann eingespart und wieder eingeschmolzen werden. Als besonders vorteilhaft hat es sich erwiesen, die Bohrung des Rohres während des Schälvorganges geringfügig aufzuweiten. Auf diese Weise ist gewährleistet, daß auch oval verformte oder eingedellte Rohre exakt geschält werden können.The invention is based on the object of specifying a method with which it is possible to manufacture seamless metallic tubes with considerably more precise dimensions. This task is achieved in a method of the type mentioned in that, according to the invention, the pressed or hot-rolled The pipe is turned off at one end on the jacket surface in such a way that the hole is centered on the jacket surface, that the tube is arranged from the twisted end over a fixed mandrel and a concentric to the mandrel Guide for the jacket surface is drawn and at least part of the jacket surface of the pipe is peeled continuously. With the help of the method according to the invention, it is now possible to produce pipes that have an exactly centrally mounted Have bore. The peeled material can be saved and melted down again. As particularly beneficial it has been found to widen the bore of the pipe slightly during the peeling process. That way is ensures that oval shaped or indented pipes can be peeled exactly.

Die Erfindung ist anhand eines Beispiels näher erläutert.The invention is explained in more detail using an example.

Zunächst wird das stranggepreßte oder warmgewalzte Rohr, das eine exzentrisch gelagerte Bohrung aufweist, in einer dazu geeigneten Vorrichtung an seinem Ende in der Weise abgedreht, daß die Bohrung des Rohres konzentrisch zur Außenmantelfläche des Rohres gelegen ist. Anschließend wird in das Rohr eine Dornstange eingefahren bzw. das Rohr über eine Dornstange gestülpt und ein Dorn an der Dornstange befestigt. Sodann wird das abgedrehte Ende des Rohres in eine Führung eingebracht und über den Dorn gezogen. Während des Ziehvorganges sind Dorn und Führung stets konzentrisch zueinander gelagert.First of all, the extruded or hot-rolled tube, which has an eccentrically mounted bore, is inserted into a tube suitable device turned off at its end in such a way that the bore of the tube is concentric to the outer circumferential surface of the pipe is located. A mandrel bar is then inserted into the pipe or the pipe is inserted over a mandrel bar and a mandrel attached to the mandrel bar. Then the turned end of the tube is placed in a guide and pulled over the mandrel. During the drawing process, the mandrel and guide are always mounted concentrically to one another.

^SP£QT5D 5 0 9 8 17/0105 ^ SP £ QT5D 5 0 9 8 17/0105

Dabei ist es -wesentlich, daß der Dorn entgegen der Ziehrichtung gesehen aus der Führung herausragt und das Schälen im Bereich des Domes vorgenommen wird, da erst der Dorn das Material in den Schneidbereich der Schälvorrichtung drückt.It is essential that the mandrel counter to the direction of pull seen protruding from the guide and the peeling is carried out in the area of the dome, since only the mandrel has the material in pushes the cutting area of the peeling device.

Mit Hilfe des erfindungsgemäßen Verfahrens ist es gelungen, auch gebogene oder oval verformte Rohre, die eine exzentrisch gelagerte Bohrung aufweisen, so zu schälen, daß die Bohrung zentrisch zur Mantelfläche des Rohres liegt. Der wesentliche Vorteil des erfindungsgemäßen Verfahrens ist darin zu sehen, daß die Rohre nunmehr bei gleichem Außendurchmesser ein geringeres Gewicht, präzisere Abmessungen haben und das abgeschälte Materi al wieder in den Schmelzvorgang eingesetzt werden kann.With the help of the method according to the invention, it has also been possible to produce curved or oval-shaped tubes that have an eccentrically mounted Have bore to be peeled so that the bore is centered on the outer surface of the pipe. The essential one The advantage of the method according to the invention is to be seen in that the tubes now have a smaller one with the same outer diameter Weight, more precise dimensions and the peeled materi al used again in the melting process can be.

ORIGINAL !NSPECTEDORIGINAL! NSPECTED

5098 17/0 1055098 17/0 105

Claims (2)

Kabel- und Metallwerke Gutehoffnungshütte Aktiengesellschaft i-1282 10. Okt. 1973 PatentansprücheKabel- und Metallwerke Gutehoffnungshütte Aktiengesellschaft i-1282 Oct. 10, 1973 Patent claims 1. Verfahren zum Herstellen von nahtlosen metallischen Rohren, bei dem zunächst aus einem Block ein Rohr gepreßt oder warmgewalzt -wird, das durch Kaltwalzen und/oder Züien in seinem Querschnitt verringert wird, dadurch gekennzeichnet, daß das gepreßte oder warmgewalzte Rohr an einem Ende an der Mantelfläche derart abgedreht wird, daß die Bohrung zentrisch zur Mantelfläche liegt, daß das Rohr von dem abgedrehten Ende aus über einen feststehenden Dorn und eine konzentrisch zum Dorn angeordnete Führung für die Mantelfläche gezogen und dabei kontinuierlich zumindest ein Teil der Mantelfläche des Rohres geschält wird.1. A process for the production of seamless metallic pipes, in which a pipe is first pressed from a block or hot-rolled by cold rolling and / or drawing is reduced in its cross-section, characterized in that the pressed or hot-rolled tube one end is turned off on the lateral surface in such a way that the bore is centered on the lateral surface that the tube from the twisted end over a fixed mandrel and one arranged concentrically to the mandrel Guide for the lateral surface drawn and thereby continuously at least part of the lateral surface of the Pipe is peeled. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Bohrung des Rohres während des Schälvorganges geringfügig aufgeweitet wird.2. The method according to claim 1, characterized in that the bore of the pipe is slightly during the peeling process is widened. 509817/0105509817/0105
DE19732351316 1973-10-12 1973-10-12 Cold drawing thin walled weldless tubes - produces accurately concentric bore involves internal mandrel and external die Pending DE2351316A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE19732351316 DE2351316A1 (en) 1973-10-12 1973-10-12 Cold drawing thin walled weldless tubes - produces accurately concentric bore involves internal mandrel and external die
IT5346874A IT1021759B (en) 1973-10-12 1974-10-10 PROCEDURE FOR THE MANUFACTURING OF SEAMLESS METALLIC TUBES AND SPOSITIVE FOR ITS REALIZATION
FR7434380A FR2247298A1 (en) 1973-10-12 1974-10-11 Cold drawing thin walled weldless tubes - produces accurately concentric bore involves internal mandrel and external die
FI296774A FI296774A (en) 1973-10-12 1974-10-11
BE149479A BE821007A (en) 1973-10-12 1974-10-11 METHOD AND DEVICE FOR THE MANUFACTURING OF SEAMLESS METAL TUBES
JP11685274A JPS5087950A (en) 1973-10-12 1974-10-12

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732351316 DE2351316A1 (en) 1973-10-12 1973-10-12 Cold drawing thin walled weldless tubes - produces accurately concentric bore involves internal mandrel and external die

Publications (1)

Publication Number Publication Date
DE2351316A1 true DE2351316A1 (en) 1975-04-24

Family

ID=5895283

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19732351316 Pending DE2351316A1 (en) 1973-10-12 1973-10-12 Cold drawing thin walled weldless tubes - produces accurately concentric bore involves internal mandrel and external die

Country Status (2)

Country Link
BE (1) BE821007A (en)
DE (1) DE2351316A1 (en)

Also Published As

Publication number Publication date
BE821007A (en) 1975-02-03

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