DE3048314A1 - Surface smoothing process for cold drawn tube - uses progressive local fusing combined with mechanical smoothing to produce hair crack free smooth surfaces - Google Patents

Surface smoothing process for cold drawn tube - uses progressive local fusing combined with mechanical smoothing to produce hair crack free smooth surfaces

Info

Publication number
DE3048314A1
DE3048314A1 DE19803048314 DE3048314A DE3048314A1 DE 3048314 A1 DE3048314 A1 DE 3048314A1 DE 19803048314 DE19803048314 DE 19803048314 DE 3048314 A DE3048314 A DE 3048314A DE 3048314 A1 DE3048314 A1 DE 3048314A1
Authority
DE
Germany
Prior art keywords
drawn tube
takes place
smooth surfaces
free
cold drawn
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.)
Ceased
Application number
DE19803048314
Other languages
German (de)
Inventor
Karl 4000 Düsseldorf Austermann
Theodor 4018 Langenfeld Bachmann
Manfred Dr. 4150 Krefeld Janßen
Volker Dr. 4330 Mülheim/Ruhr Schmidt
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.)
Vodafone GmbH
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 DE19803048314 priority Critical patent/DE3048314A1/en
Publication of DE3048314A1 publication Critical patent/DE3048314A1/en
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P9/00—Treating or finishing surfaces mechanically, with or without calibrating, primarily to resist wear or impact, e.g. smoothing or roughening turbine blades or bearings; Features of such surfaces not otherwise provided for, their treatment being unspecified
    • 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
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture 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
    • B21C37/30—Finishing tubes, e.g. sizing, burnishing

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)

Abstract

The arrangement is intended for producing a hair crack-free and smooth metal surface, particularly of a cold-drawn tube (1). The surface is fused to a depth to which any flaws extend and the softened layer (7) thus produced is mechanically smoothed (6). The operation may be carried out with fixed or rotating internal and/or external tools. Fusing, shaping and cooling may be carried out in a protective gas atmosphere and in a continuous process. Fusing may be by laser or electron beam, electric induction, electric arc (2) or a flame.

Description

Die Erfindung betrifft ein Verfahren zur HerstellungThe invention relates to a method of manufacture

rißfreier und glatter Metalloberflächen, insbesondere bei Rohren.crack-free and smooth metal surfaces, especially for pipes.

Knltgezogene Rohre weisen aufgrund des warm gefertigten Ausgangsrohres an der Oberfläche feine Risse auf, die bei dynamischer Belastung des Rohres als Rißarten wirken und zum frühzeitigen Bruch führen können.Because of the hot-finished output pipe, crinkled pipes show on the surface there are fine cracks that appear as Crack types act and can lead to premature breakage.

Diese Risse oder andere Ungänzen sind üblicherweise nicht tiefer als 1 mm.These cracks or other discontinuities are usually no deeper than 1 mm.

Durch spanabhebende Bearbeitungsverfahren können die Oberflächen rißfrei gemacht werden. Bei langen Rohren mit einem kleinen Durchmesser sind die spanabhebenden Bearbeitungsverfahren aber sehr aufwendig.By machining processes, the surfaces can be free of cracks be made. In the case of long tubes with a small diameter, the ones that are machined are Machining process, however, very complex.

Es ist Aufgabe der Erfindung ein einfaches Verfahren zur Herstellung rißfreier und glatter Metalloberflächen, insbesondere bei Rohren zu schaffen.The object of the invention is a simple method of production To create crack-free and smooth metal surfaces, especially for pipes.

Zur Lösung dieser Aufgabe wird erfindungsgemäß ein Verfahren gemäß Anspruch 1 vorgeschlagen. Weiterbildungen ergeben sich aus den Unteransprüchen.In order to achieve this object, according to the invention, a method according to Claim 1 proposed. Further developments result from the subclaims.

Der Vorteil des erfindungsgemäßen Verfahrens liegt darin, daß aufwendige Nachbearbeitungen der in üblicher Weise hergestellten Ausgangsrohre entfallen.The advantage of the method according to the invention is that expensive There is no need for post-processing of the starting pipes produced in the usual way.

In den beigefügten Zeichnungen ist die Durchführung des Verfahrens schematisch dargestellt.In the accompanying drawings is the implementation of the method shown schematically.

Dabei zeigt: Fig. 1 eine schematische Darstellung des Verfahrens und F g. 2 eine Abwandlung, Fig. 3 eine Vorrichtung zum gleichzeitigen Anschmelzen und Bearbeiten der Innen- und Außenflächen eines Rohres und Fig. 4 einen Schnitt durch die Vorrichtung gemäß Fig. 3.It shows: FIG. 1 a schematic representation of the method and FIG F g. 2 shows a modification, FIG. 3 shows a device for simultaneous melting and Machining the inner and outer surfaces of a pipe and FIG. 4 shows a section through the device according to FIG. 3.

Auf der Dornstange 5 in der Figur 1 ist vor dem Innenwerkzeug 6 eine Elektrode 7 angebracht. Zwischen Rohr 1 und Elektrode 3 brennt ein durch die Magnetspule 4 gesteuerter rotierender Lichtbogen 2 und schmilzt die Oberfläche bei 7 an. Aufgrund des Rohrziehens in Pfeilrichtung durch das Außenwerkzeug 8 und über das Innenwerkzeug 6 wird die teigige Oberfläche formend beeinflußt, so daß eine rißfreie und besonders glatte Oberfläche entsteht.On the mandrel bar 5 in FIG. 1, in front of the inner tool 6, there is a Electrode 7 attached. The magnetic coil causes a burn between tube 1 and electrode 3 4 controlled rotating arc 2 and melts the surface at 7. Because of of pipe drawing in the direction of the arrow through the outer tool 8 and over the inner tool 6 the doughy surface is influenced shaping, so that a crack-free and special smooth surface is created.

In den Figuren 3 und 4 wird beispielhaft gezeigt, wie die mit Ungänzen behaftete Innen- und Außenoberfläche eines Rohres 1 gleichzeitig durch Anschmelzen mittels Lichtbögen 2 und anschließender formgebender Bearbeitung durch Rollen 10 glatt und rißfrei wird.FIGS. 3 and 4 show by way of example how those with discontinuities contaminated inner and outer surface of a pipe 1 simultaneously by melting by means of arcs 2 and subsequent shaping processing by rollers 10 becomes smooth and free of cracks.

Dabei wird das Rohr 1 mittels einer Vorrichtung 11, welche das Rohr gleichzeitig dreht und zieht, huber ein Innenwerkzeug 12 und durch ein Außenwerkzeug 13 gezogen.The tube 1 is by means of a device 11, which the tube simultaneously rotates and pulls, via an internal tool 12 and through an external tool 13 drawn.

Innen- und Außensrerkzeug besitzen Elektroden 4 und Rollen 10, die in bezug auf die Rohrabmessungen beliebig verstellt werden können. Die zwischen Rohr 1 und Elektroden 4 brennenden Lichtbögen 2 schmelzen dabei die mit Ungänzen behafteten Oberfläche des Rohres an, so daß die Ungänzen beseitigt werden. Durch anschließendes Glätten im teigigen oder flüssigen Zustand mit den Rollen ist die Oberfläche nach dem Erstarren rißfrei und glatt.Internal and external tools have electrodes 4 and rollers 10 that can be adjusted as required with respect to the pipe dimensions. The between Tube 1 and electrodes 4 burning arcs 2 melt the with discontinuities afflicted surface of the pipe, so that the discontinuities are eliminated. By subsequent smoothing in the pasty or liquid state with the rollers is that Surface after solidification crack-free and smooth.

LeerseiteBlank page

Claims (5)

Verfahren zur Herstellung rißfreier und glatter Metalloberflächen, insbesondere bei Rohren. Process for the production of crack-free and smooth metal surfaces, especially with pipes. Patentansprüche: Verfahren zur Herstellung rißfreier und glatter Metalloberflächen, insbesondere bei Rohren, dadurch gekennzeichnet, daß die Oberfläche bis zu einem Tiefenbereich, in dem Umgänzen auftreten, angeschmolzen und anschließend im teigigen oder flüssigen Zustand mechanisch glättend bearbeitet wird. Claims: Process for producing crack-free and smooth Metal surfaces, especially in the case of pipes, characterized in that the surface It is melted down to a depth range in which encircling occurs and then is processed mechanically smoothing in the pasty or liquid state. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Bearbeitung mit Hilfe feststehender oder rotierender Innen- und/oder Außenwerkzeuge erfolgt.2. The method according to claim 1, characterized in that the processing takes place with the help of fixed or rotating internal and / or external tools. z. Verfahren nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß das Anschmelzen, Formen und Abkühlen unter Schutzgas erfolgt.z. Process according to Claims 1 and 2, characterized in that that the melting, shaping and cooling takes place under protective gas. 4. Verfahren nach einem der vorstehenden Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Anschmelzen fortschreitend erfolgt.4. The method according to any one of the preceding claims 1 to 3, characterized characterized in that the melting takes place progressively. 5. Verfahren nach einem der vorstehenden Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Anschmelzen durch Laserlicht. Elektronenstrahl, elektrische Induktion, Lichtbogen oder eine Flamme erfolgt.5. The method according to any one of the preceding claims 1 to 4, characterized characterized in that the melting by laser light. Electron beam, electric Induction, arc or flame takes place.
DE19803048314 1980-12-18 1980-12-18 Surface smoothing process for cold drawn tube - uses progressive local fusing combined with mechanical smoothing to produce hair crack free smooth surfaces Ceased DE3048314A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19803048314 DE3048314A1 (en) 1980-12-18 1980-12-18 Surface smoothing process for cold drawn tube - uses progressive local fusing combined with mechanical smoothing to produce hair crack free smooth surfaces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19803048314 DE3048314A1 (en) 1980-12-18 1980-12-18 Surface smoothing process for cold drawn tube - uses progressive local fusing combined with mechanical smoothing to produce hair crack free smooth surfaces

Publications (1)

Publication Number Publication Date
DE3048314A1 true DE3048314A1 (en) 1982-07-22

Family

ID=6119836

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19803048314 Ceased DE3048314A1 (en) 1980-12-18 1980-12-18 Surface smoothing process for cold drawn tube - uses progressive local fusing combined with mechanical smoothing to produce hair crack free smooth surfaces

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Country Link
DE (1) DE3048314A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT380417B (en) * 1984-03-14 1986-05-26 Voest Alpine Ag METHOD FOR INCREASING THE STRENGTH OF SINGLE-WALLED TUBULAR COMPONENTS, AND APPARATUS FOR CARRYING OUT THIS METHOD
DE3702066A1 (en) * 1987-01-24 1988-08-04 Gao Jianmin Cold-rolling mill for large tubes
US5253678A (en) * 1989-03-27 1993-10-19 Sumitomo Metal Industries, Ltd. Long tube having a small diameter
CN101569978B (en) * 2009-05-05 2011-08-24 宁波市精恒凯翔机械有限公司 Mirror surface rolling tool with internal cooling lubricating function

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT380417B (en) * 1984-03-14 1986-05-26 Voest Alpine Ag METHOD FOR INCREASING THE STRENGTH OF SINGLE-WALLED TUBULAR COMPONENTS, AND APPARATUS FOR CARRYING OUT THIS METHOD
DE3702066A1 (en) * 1987-01-24 1988-08-04 Gao Jianmin Cold-rolling mill for large tubes
US5253678A (en) * 1989-03-27 1993-10-19 Sumitomo Metal Industries, Ltd. Long tube having a small diameter
CN101569978B (en) * 2009-05-05 2011-08-24 宁波市精恒凯翔机械有限公司 Mirror surface rolling tool with internal cooling lubricating function

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OP8 Request for examination as to paragraph 44 patent law
8131 Rejection