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EP1420899B1 - Method for producing elongate-shaped elements made of magnesium or magnesium alloys - Google Patents

Method for producing elongate-shaped elements made of magnesium or magnesium alloys Download PDF

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Publication number
EP1420899B1
EP1420899B1 EP02760134A EP02760134A EP1420899B1 EP 1420899 B1 EP1420899 B1 EP 1420899B1 EP 02760134 A EP02760134 A EP 02760134A EP 02760134 A EP02760134 A EP 02760134A EP 1420899 B1 EP1420899 B1 EP 1420899B1
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EP
European Patent Office
Prior art keywords
magnesium
process according
cold
lubricant
smoothed
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.)
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EP02760134A
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German (de)
French (fr)
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EP1420899A1 (en
Inventor
Jörg EICKEMEYER
Martina Falter
Albert GÜTH
Ralph Opitz
Jürgen Reichert
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Leibniz Institut fuer Festkorper und Werkstofforschung Dresden eV
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Leibniz Institut fuer Festkorper und Werkstofforschung Dresden eV
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
    • 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
    • B21C1/003—Drawing materials of special alloys so far as the composition of the alloy requires or permits special drawing methods or sequences
    • 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
    • B21C9/00—Cooling, heating or lubricating drawing material

Definitions

  • the invention relates to a process for the preparation of strand-like products, such as wires, rods and tubes, from Magnesium or magnesium alloys, by sliding pull at Room temperature.
  • the wires produced by the method can be used, for example, as welding consumables for the laser beam welding of magnesium materials. However, they can also be used, for example, as a substrate for physico-chemical coatings, such as for the new magnesium diboride superconductors MgB 2 (Nagamatsu, Nagakawa, T. Muranaka, Y. Zenitani and Akimitsu J. Nature 410 (2001) ) 63).
  • the invention is based on the object, a method to That's the production of magnesium wires, rods and -tubes on the way of cold drawing allows.
  • This object is achieved by a forming process in which the magnesium materials are subjected to a smoothing surface treatment prior to forming, which ensures the lowest possible surface roughness, wherein the value of the average roughness R z ⁇ 12 microns must be, and in which the cold drawing using on the forming material firmly adhering solid lubricant coatings is performed.
  • the smoothing surface treatment is performed such that a surface roughness with an average roughness R z of 2 to 8 microns is generated.
  • the surface of the magnesium materials Smoothed by means of peeling or grinding.
  • the smoothed magnesium materials are removed before cooling with a strong, well-adhering lubricant film through Drying of liquid lubricant dispersions coated.
  • Metal soap systems may be preferred as Lubricant can be used, the polymeric components such as cellulose derivatives or polyvinyl alcohol containing contribute to increasing the adhesion.
  • Cold drawing is done with a 10% reduction in cross section 40%, preferably with a 20% reduction in the cross section carried out.
  • the drawn product can finally be peeled, ground or freed from the oxide skin by pickling become. Thereafter, the covering layer-free product of a be subjected to chemical reaction.
  • a chemical reaction can be carried out, by which on the surface of the product a magnesium diboride layer (MgB 2 ) is produced, which has superconducting properties.
  • the method according to the invention is based on the idea that the starting material for the forming process in contrast the usual procedure as smooth as possible surface and that on this little rough surface a well-adhering lubricant layer is applied.
  • the magnesium material is used before the Cold drawing subjected to the surface treatment, which is the Smoothing of forming material to a high degree.
  • the smoothed material is then with a solid lubricant film with good Adhesion coated and can then with usual Drawing dies, for example made of hard metal, are drawn.
  • a magnesium rod with a starting diameter of 30 mm is extruded at a temperature of 350 ° C.
  • the extruded rod is peeled and drawn from a ⁇ 5.7 mm wire diameter over 4 stages at room temperature as follows: ⁇ 5.7 mm ⁇ 05.2 mm ⁇ 04.9 mm ⁇ 04.3 mm ⁇ 03.9 mm.
  • This output wire is connected to the first drawing stage with a Solid lubricant type R261, the polyvinyl alcohol as Contains adhesive component, from a liquid dispersion coated and dried.
  • the resulting solid film has calcium stearate as Lubricant base and allows the entire Ziehumformung without additional lubricant use.
  • the wire drawn in this way can then be in Tightening process further up to a diameter ⁇ 1 mm where it may be necessary to: the surface of the wire between individual drawing stages a smoothing processing is subjected.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Extraction Processes (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)

Abstract

The invention relates to a method for producing elongate-shaped elements, such as wires, rods and pipes made of magnesium or magnesium alloys by slip-type drawing at room temperature. The aim of the invention is to develop a method which enables magnesium wires, rods and pipes to be produced by cold-drawing. According to said a method, this is achieved by subjecting the materials to surface treatment before the deformation thereof, guaranteeing a surface roughness which is as low as possible, the value of the average surface roughness being Rz < 12 mu m. The cold-adherent is carried out by using solid-adherent lubricant coatings on the deformation items.

Description

Technisches GebietTechnical area

Die Erfindung betrifft ein Verfahren zur Herstellung von strangförmigen Produkten, wie Drähten, Stäben und Rohren, aus Magnesium oder Magnesiumlegierungen, durch Gleitziehen bei Raumtemperatur.The invention relates to a process for the preparation of strand-like products, such as wires, rods and tubes, from Magnesium or magnesium alloys, by sliding pull at Room temperature.

Die nach dem Verfahren hergestellten Drähte können beispielsweise als Schweißzusatzwerkstoffe für das Laserstrahlschweißen von Magnesiumwerkstoffen angewendet werden. Sie sind beispielsweise aber auch einsetzbar als Unterlage für physikalisch-chemische Beschichtungen, wie für die neuen Magnesium-Diborid-Supraleiter MgB2 (J. Nagamatsu, N. Nagakawa, T. Muranaka, Y. Zenitani und J. Akimitsu: Nature 410(2001)63).The wires produced by the method can be used, for example, as welding consumables for the laser beam welding of magnesium materials. However, they can also be used, for example, as a substrate for physico-chemical coatings, such as for the new magnesium diboride superconductors MgB 2 (Nagamatsu, Nagakawa, T. Muranaka, Y. Zenitani and Akimitsu J. Nature 410 (2001) ) 63).

Stand der TechnikState of the art

Verfahren zum Gleitziehen von strangförmigen Produkten aus Magnesium oder Magnesiumlegierungen bei Raumtemperatur sind nicht bekannt. Method for sliding pull of stranded products Magnesium or magnesium alloys at room temperature not known.

Die bekannten, angewendeten Umformverfahren der Kaltumformung von Magnesium und dessen Legierungen betreffen das Walzen, als reine Druckumformung, und die Blechumformung unter wenig anspruchsvollen Umformbedingungen. Bereits beim Tiefziehen von Magnesiumblechen werden auf Grund der erhöhten Anforderungen an das wenig duktile Metall, das ein hexagonaldichtgepacktes Gitter aufweist, Temperaturen von 220°C bis 370°C angewendet (J. A. Schey: Tribology in Metalworking, ASM, Metals Park, Ohio, USA, 1984, S. 561).The known, applied forming methods of cold forming of magnesium and its alloys concern rolling, as pure pressure forming, and the sheet metal forming under little demanding forming conditions. Already during deep drawing of magnesium sheets are due to the increased Requirements for the less ductile metal, which is a hexagon density packed Lattice has temperatures from 220 ° C to 370 ° C (J.A. Schey: Tribology in Metalworking, ASM, Metals Park, Ohio, USA, 1984, p. 561).

Bekannt ist auch, dass als Schmierstoffe Seifen und Wachse für die leichten Umformungen benutzt werden und dass Talkum und Graphit für anspruchsvollere Umformungen bei erhöhten Temperaturen eingesetzt werden (S. Kalpakjian: Manufacturing Processes for Engineering Materials, Addison-Wessley Publishing Company, Reading, Massachusetts, USA, 1991, S.342).It is also known that soaps and waxes are used as lubricants be used for the light transformations and that talc and graphite for more demanding transformations at elevated levels Temperatures are used (S. Kalpakjian: Manufacturing Processes for Engineering Materials, Addison-Wessley Publishing Company, Reading, Massachusetts, USA, 1991, S.342).

Dagegen gibt es für das Kaltziehen von Drähten, Stangen oder Rohren aus Magnesiumwerkstoffen keine Empfehlungen über anzuwendende spezielle Schmierstoffe oder nötige Oberflächenvorbehandlungen, weil der Vorgang bis heute offenbar technologisch nicht durchgeführt wird. Hierfür dürfte sowohl die geringe Duktilität des Magnesiums, als auch dessen kompliziertes tribologisches Verhalten die Ursache sein. Letzteres wird maßgeblich durch die gegenüber dem Metall etwa 10-fach härtere Oxidschicht (P. L. Hurricks, Wear 15(1970), 389-409) und die ausgesprochen hohe chemische Reaktivität des Magnesiums (G. V. Raynor: The Physical Metallurgy of Magnesium and its Alloys, Pergamon Press, 1959) bedingt.In contrast, there are for the cold drawing of wires, rods or Tubes made of magnesium materials no recommendations about applicable special lubricants or necessary Surface treatments, because the process continues today apparently not carried out technologically. Therefor Both the low ductility of magnesium, as well as its complicated tribological behavior is the cause be. The latter is determined by the opposite Metal about 10 times harder oxide layer (P.L. Hurricks, Wear 15 (1970), 389-409) and the extremely high chemical Reactivity of Magnesium (G.V. Raynor: The Physical Metallurgy of Magnesium and Its Alloys, Pergamon Press, 1959) conditionally.

Des Weiteren ist es bekannt, dass die Oberfläche schwer umformbarer metallischer Werkstoffe vor dem Ziehprozess gezielt rauher gemacht wird. Dies dient dem Zweck der besseren Einlagerung von Festschmierstoffen in die Oberfläche selbst und damit einer gesteigerten Schmierwirksamkeit (J. A. Schey: Tribology in Metalworking, ASM, Metals Park, Ohio, USA, 1984). Der rauhe Zustand der Oberfläche wird in der Regel chemisch durch Beizen oder mechanisch durch Biegeentzundern oder durch Anstrahlen mit hartem Granulat erzeugt. Für diese Ausgangsrauheiten sind Rauhtiefen Rt im Bereich von etwa 25 µm bis 45 µm charakteristisch (E. Schultz: Stahl und Eisen 83(1963)866-870). Sie können aber auch noch erheblich darüber liegen (E. Jaenichen u.a.: Stahl und Eisen 77(1957)1785-1795). Die relativ hohe Ausgangsrauheit nimmt mit steigendem Umformgrad von Ziehstufe zu Ziehstufe mehr und mehr ab. Es erfolgt eine Einebnung des Rauheitsgebirges, sowohl in Längs- als auch in Umfangsrichtung (M. Rehm und J. Eickemeyer: Reibung und Verschleiß, Hrsg.: DGM Informationsgesellschaft, Oberursel, 1996, S. 413-418).Furthermore, it is known that the surface of difficult-to-form metallic materials is made specifically rougher before the drawing process. This is for the purpose of better incorporation of solid lubricants into the surface itself and thus increased lubricity (JA Schey: Tribology in Metalworking, ASM, Metals Park, Ohio, USA, 1984). The rough condition of the surface is usually generated chemically by pickling or mechanically by bending descaling or by blasting with hard granules. Roughness depths R t in the range from about 25 μm to 45 μm are characteristic for these initial roughnesses (E. Schultz: Stahl and Eisen 83 (1963) 866-870). But they can also be considerably more (E. Jaenichen et al.: Stahl and Eisen 77 (1957) 1785-1795). The relatively high starting roughness decreases more and more with increasing degree of forming from drawing stage to drawing stage. There is a leveling of the Rauheitsgebirges, both in the longitudinal and in the circumferential direction (M. Rehm and J. Eickemeyer: friction and wear, ed.: DGM Information Society, Oberursel, 1996, pp. 413-418).

Bekannt ist auch, dass im Trockenziehbereich mit Pulverschmierstoffen auf Metallseifenbasis geschmiert wird, wobei zur Stabilisierung des Vorganges zusätzlich Schmierstoffträgerschichten angewendet werden.It is also known that in Trockenziehbereich with Lubricating powder lubricants on metal soap base, in addition to stabilizing the process Lubricant carrier layers are applied.

Neuere, allerdings wenig angewendete Beschichtungssysteme mit gutem Haftvermögen auf dem Umformgut enthalten sowohl Schmier- als auch Trägerkomponenten (J. Eickemeyer, H. Genest, J. Reichert und H.-R. Vogel: Umweltverträglichere Schmierstoffe für das Kaltziehen. Tribologie und Schmierungstechnik 39(1992)6,334-338). Newer, but less applied coating systems with good adhesion to the forming material included both Lubricant and carrier components (J. Eickemeyer, H. Genest, J. Reichert and H.-R. Bird: more environmentally friendly Lubricants for cold drawing. Tribology and Schmierungstechnik 39 (1992) 6,334-338).

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt die Aufgabe zu Grunde, ein Verfahren zu schaffen, das die Herstellung von Magnesiumdrähten, -stangen und -rohren auf dem Wege des Kaltziehens ermöglicht.The invention is based on the object, a method to That's the production of magnesium wires, rods and -tubes on the way of cold drawing allows.

Diese Aufgabe wird mit einem Umformverfahren gelöst, bei dem die Magnesiumwerkstoffe vor ihrer Umformung einer glättenden Oberflächenbearbeitung unterzogen werden, die eine möglichst geringe Oberflächenrauhigkeit gewährleistet, wobei der Wert der gemittelten Rauhtiefe Rz < 12 µm betragen muss, und bei dem das Kaltziehen unter Anwendung von auf dem Umformgut fest haftenden Festschmierstoff-Beschichtungen durchgeführt wird.This object is achieved by a forming process in which the magnesium materials are subjected to a smoothing surface treatment prior to forming, which ensures the lowest possible surface roughness, wherein the value of the average roughness R z <12 microns must be, and in which the cold drawing using on the forming material firmly adhering solid lubricant coatings is performed.

Gemäß einer vorteilhaften Ausgestaltung des Verfahrens wird die glättende Oberflächenbearbeitung derart ausgeführt, dass eine Oberflächenrauhigkeit mit einer gemittelten Rauhtiefe Rz von 2 bis 8 µm erzeugt wird.According to an advantageous embodiment of the method, the smoothing surface treatment is performed such that a surface roughness with an average roughness R z of 2 to 8 microns is generated.

Zweckmäßigerweise wird die Oberfläche der Magnesiumwerkstoffe mittels Ziehschälen oder Schleifen geglättet.Conveniently, the surface of the magnesium materials Smoothed by means of peeling or grinding.

Die geglätteten Magnesiumwerkstoffe werden vor dem Kältziehen mit einem festen, gut haftenden Schmierstofffilm durch Auftrocknen flüssiger Schmiermitteldispersionen beschichtet.The smoothed magnesium materials are removed before cooling with a strong, well-adhering lubricant film through Drying of liquid lubricant dispersions coated.

Vorzugsweise können dabei Metallseifensysteme als Schmierstoff verwendet werden, die polymere Komponenten enthalten, wie Zellulosederivate oder Polyvinylalkohol, die zur Steigerung der Haftfähigkeit beitragen. Metal soap systems may be preferred as Lubricant can be used, the polymeric components such as cellulose derivatives or polyvinyl alcohol containing contribute to increasing the adhesion.

Vor dem Kaltziehen können auch feste Schmierstofffilme durch Aufpressen plastischer oder pastenartiger Schmierstoffe oder Schmierstoffgemische aufgebracht werden.Before cold drawing and solid lubricant films can Pressing on plastic or paste-like lubricants or Lubricant mixtures are applied.

Das Kaltziehen wird mit Querschnittsabnahmen von 10 % bis 40 %, vorzugsweise mit Querschnittsabnahmen um 20 % durchgeführt.Cold drawing is done with a 10% reduction in cross section 40%, preferably with a 20% reduction in the cross section carried out.

Das gezogene Produkt kann abschließend ziehgeschält, überschliffen oder durch Beizen von der Oxidhaut befreit werden. Danach kann das deckschichtfreie Produkt einer chemischen Reaktion unterworfen werden.The drawn product can finally be peeled, ground or freed from the oxide skin by pickling become. Thereafter, the covering layer-free product of a be subjected to chemical reaction.

So kann beispielsweise auf der Oberfläche in reinem Wasserstoff mit Diboran eine chemische Reaktion durchgeführt werden, durch die auf der Oberfläche des Produktes eine Magnesiumdiborid-Schicht (MgB2) erzeugt wird, die supraleitende Eigenschaften hat.Thus, for example, on the surface in pure hydrogen with diborane, a chemical reaction can be carried out, by which on the surface of the product a magnesium diboride layer (MgB 2 ) is produced, which has superconducting properties.

Dem erfindungsgemäßen Verfahren liegt der Gedanke zu Grunde, dass das Ausgangsmaterial für den Umformvorgang im Gegensatz zur üblichen Verfahrensweise eine möglichst glatte Oberfläche haben muss und dass zudem auf dieser wenig rauhen Oberfläche eine gut haftende Schmierstoffschicht aufgebracht ist. Um dies zu erreichen, wird der Magnesiumwerkstoff vor dem Kaltziehen der Oberflächenbehandlung unterworfen, die das Umformgut hochgradig glättet. Der geglättete Werkstoff wird anschließend mit einem Festschmierstofffilm mit guter Haftfähigkeit beschichtet und kann dann mit üblichen Ziehsteine, beispielsweise aus Hartmetall, gezogen werden.The method according to the invention is based on the idea that the starting material for the forming process in contrast the usual procedure as smooth as possible surface and that on this little rough surface a well-adhering lubricant layer is applied. Around To achieve this, the magnesium material is used before the Cold drawing subjected to the surface treatment, which is the Smoothing of forming material to a high degree. The smoothed material is then with a solid lubricant film with good Adhesion coated and can then with usual Drawing dies, for example made of hard metal, are drawn.

Beim Ziehen mit Querschnittsabnahmen von vorzugsweise jeweils etwa 20 % tendiert die Oberfläche des gezogenen Materials mit zunehmender Gesamtabnahme zum rauher werden. Deshalb kann nach einigen Ziehstufen, zum Beispiel nach etwa 60 % Querschnittsreduktion, eine Wärmebehandlung mit anschließender Oberflächenglättung durch neuerliches Schälen nötig werden, bevor weiter gezogen werden kann. Der Fachmann kann leicht entscheiden, ob die Glüh- und Oberflächenbehandlung angezeigt ist oder ob problemlos weiter gezogen werden kann. Diese Verfahrensweise ist in Richtung kleiner werdender Abmessungen beizubehalten, wobei das durch die Umformung bedingte Aufrauhen geringer und die Ziehbarkeit des Magnesiums damit besser wird. Das Ziehen mit den festen Schmierstofffilmen kann bis in den Abmessungsbereich von einigen Zehntel Millimetern fortgesetzt werden, um Mg-Feindraht herzustellen.When pulling with cross-sectional decreases of preferably each About 20% of the surface of the drawn material tends to increasing overall decrease to become rougher. That's why after some drawing stages, for example after about 60% Cross-section reduction, a heat treatment with subsequent surface smoothing by renewed peeling necessary before it can be moved on. The expert can easily decide if the annealing and Surface treatment is displayed or whether easily continue can be pulled. This procedure is in the direction smaller dimensions to be maintained, the by the forming required roughening lower and the drawability of magnesium gets better. Pulling with the firm Lubricant films can be up to the size range of a few tenths of a millimeter to Mg fine wire manufacture.

Weg zur Ausführung der ErfindungWay to carry out the invention

Nachstehend ist die Erfindung an einem Ausführungsbeispiel näher erläutert.Below is the invention of an embodiment explained in more detail.

Ein Magnesiumstab mit einem Ausgangsdurchmesser von 30 mm wird bei einer Temperatur von 350°C stranggepresst. Der stranggepresste Stab wird ziehgeschält und ausgehend von Ø 5,7 mm Drahtdurchmesser über 4 Stufen bei Raumtemperatur wie folgt gezogen:
Ø5,7 mm → 05,2 mm → 04,9 mm → 04,3 mm → 03,9 mm.A magnesium rod with a starting diameter of 30 mm is extruded at a temperature of 350 ° C. The extruded rod is peeled and drawn from a Ø5.7 mm wire diameter over 4 stages at room temperature as follows:
Ø5.7 mm → 05.2 mm → 04.9 mm → 04.3 mm → 03.9 mm.

Dies entspricht einer Gesamtquerschnittsabnahme von εg = 53,2 %. This corresponds to a total cross-section decrease of ε g = 53.2%.

Dieser Ausgangsdraht wird vor der ersten Ziehstufe mit einem Festschmierstoff des Typs R261, der Polyvinylalkohol als Haftkomponente enthält, aus einer flüssigen Dispersion heraus beschichtet und getrocknet.This output wire is connected to the first drawing stage with a Solid lubricant type R261, the polyvinyl alcohol as Contains adhesive component, from a liquid dispersion coated and dried.

Der resultierende feste Film hat Calciumstearat als Schmierstoffbasis und ermöglicht die gesamte Ziehumformung ohne zusätzlichen Schmierstoffeinsatz.The resulting solid film has calcium stearate as Lubricant base and allows the entire Ziehumformung without additional lubricant use.

Der auf diese Weise gezogene Draht kann dann im Feinzugverfahren weiter bis zu einem Durchmesser < 1 mm weiterverarbeitet werden, wobei es notwendig sein kann, dass die Oberfläche des Drahtes zwischen einzelnen Ziehstufen einer Glättungsbearbeitung unterworfen wird.The wire drawn in this way can then be in Tightening process further up to a diameter <1 mm where it may be necessary to: the surface of the wire between individual drawing stages a smoothing processing is subjected.

Claims (10)

  1. Process for producing elongate-shaped products, such as wires, rods and tubes, from magnesium or magnesium alloys, characterized in that the magnesium materials, before being, deformed, are subjected to a smoothing surface treatment which ensures that the surface roughness is as low as possible, in which context the roughness average Rz must be < 12 µm, and in that the cold-drawing is carried out using solid lubricant coatings which are securely bonded to the material to be deformed.
  2. Process according to Claim 1, characterized in that the smoothing surface treatment produces a surface roughness with a roughness average Rz of from 2 to 8 µm.
  3. Process according to Claim 1, characterized in that the surface of the magnesium materials is smoothed by means of draw-peeling.
  4. Process according to Claim 1, characterized in that the surface of the magnesium materials is smoothed by means of grinding.
  5. Process according to Claim 1, characterized in that the smoothed magnesium materials, prior to the cold-drawing, are coated with a solid film of lubricant with good adhesion by drying-on liquid lubricant dispersions.
  6. Process according to Claim 5, characterized in that the lubricant used is preferably metal soap systems which contain polymeric components, such as cellulose derivatives or polyvinyl alcohol, which make a contribution to increasing the adhesion.
  7. Process according to Claim 1, characterized in that prior to the cold-drawing, solid lubricant films are applied by pressing on plastic or pasty lubricants or lubricant mixtures.
  8. Process according to Claim 1, characterized in that the cold-drawing is carried out with reductions in cross section of from 10% to 40%, preferably with reductions in cross section of around 20%.
  9. Process according to Claim 1, characterized in that the cold-drawing is carried out using hard-metal drawing dies.
  10. Process according to Claims 1 to 9, characterized in that the drawn product is then draw-peeled, reground or has the oxide skin removed by pickling, and in that then the product without its covering layer is subjected to a chemical reaction, preferably with diborane in pure hydrogen, which produces a magnesium diboride layer (MgB2), which has superconducting properties, on the surface of the product.
EP02760134A 2001-08-24 2002-08-22 Method for producing elongate-shaped elements made of magnesium or magnesium alloys Expired - Lifetime EP1420899B1 (en)

Applications Claiming Priority (3)

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DE10142204 2001-08-24
DE10142204A DE10142204A1 (en) 2001-08-24 2001-08-24 Process for the production of strand-like products from magnesium or magnesium alloys
PCT/DE2002/003125 WO2003018225A1 (en) 2001-08-24 2002-08-22 Method for producing elongate-shaped elements made of magnesium or magnesium alloys

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EP1420899B1 true EP1420899B1 (en) 2005-10-26

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AT (1) ATE307691T1 (en)
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JP4862983B2 (en) * 2005-03-22 2012-01-25 住友電気工業株式会社 Magnesium welding wire manufacturing method
DE102006014790A1 (en) * 2006-03-29 2007-10-11 Getrag Ford Transmissions Gmbh Gearbox with shim
CN103170516B (en) * 2013-03-05 2015-11-18 广州有色金属研究院 The short process making method of a kind of magnesium or magnesium alloy capillary
CN104174685B (en) * 2014-07-28 2015-12-09 攀钢集团江油长城特殊钢有限公司 Turbine rotor groove is carved by profiled bar and processing method thereof
CN106269937B (en) * 2016-08-31 2019-02-22 福机机械工业(宁波)有限公司 A kind of blank cold-drawing process of automobile engine oil circuit system mounting bracket
CN115255825A (en) * 2022-07-29 2022-11-01 上海工程技术大学 A kind of preparation process of magnesium alloy wire with high axial diameter ratio and fine grain structure

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DE19834853A1 (en) * 1998-08-01 2000-02-03 August Neuhoff Fa Backing material and its use as well as cold-forming processes

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WO2003018225A1 (en) 2003-03-06
ATE307691T1 (en) 2005-11-15
DE10142204A1 (en) 2003-03-06
EP1420899A1 (en) 2004-05-26

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