EP1420899A1 - 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

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Publication number
EP1420899A1
EP1420899A1 EP02760134A EP02760134A EP1420899A1 EP 1420899 A1 EP1420899 A1 EP 1420899A1 EP 02760134 A EP02760134 A EP 02760134A EP 02760134 A EP02760134 A EP 02760134A EP 1420899 A1 EP1420899 A1 EP 1420899A1
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EP
European Patent Office
Prior art keywords
magnesium
lubricant
cold drawing
carried out
smoothed
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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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EP1420899B1 (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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Publication of EP1420899A1 publication Critical patent/EP1420899A1/en
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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 method for producing strand-like products, such as wires, rods and tubes, from
  • the wires produced by the process can be used, for example, as filler metals for laser beam welding of magnesium materials. However, they can also be used, for example, as a base for physico-chemical coatings, such as for the new magnesium diboride superconductor MgB 2 (J. Nagamatsu, N. Nagakawa, T. Muranaka, Y. Zenitani and J. Akimitsu: Nature 410 (2001 ) 63).
  • soaps and waxes are used as lubricants for light forming and that talc and graphite are used for more demanding forming at elevated temperatures (S. Kalpak ⁇ ian: Manufacturing Processes for Engineering Materials, Addison-Wessley Publishing Company, Readmg, Massachusetts, USA, 1991, p.342).
  • the invention is based on the object of providing a method which enables the production of magnesium wires, rods and tubes by cold drawing.
  • This task is solved with a forming process in which the magnesium materials are subjected to a smooth surface treatment before they are formed, which ensures the lowest possible surface roughness, the mean surface roughness value R z ⁇ 12 ⁇ m, and in which cold drawing using solid lubricant coatings adhering firmly to the material to be formed.
  • the smooth surface treatment is carried out in such a way that a surface roughness with an average roughness depth R z of 2 to 8 ⁇ m is generated.
  • the surface of the magnesium materials is expediently smoothed using drawing shells or grinding.
  • the smoothed magnesium materials are coated with a firm, well-adhering lubricant film by drying up liquid lubricant dispersions.
  • Metal selenium systems which contain polymeric components, such as cellulose derivatives or polyvinyl alcohol, which contribute to increasing the adhesiveness, can preferably be used as the lubricant. Before cold drawing, solid lubricant films can also be applied by pressing on plastic or paste-like lubricants or lubricant mixtures.
  • the cold drawing is carried out with a decrease in cross section of 10% to 40%, preferably with a decrease in cross section of 20%.
  • the drawn product can finally be drawn-coated, smoothed over or freed from the oxide skin by pickling.
  • the top layer-free product can then be subjected to a chemical reaction.
  • a chemical reaction can be carried out on the surface in pure hydrogen with diborane, by means of which a magnesium diboride layer (MgB 2 ) is produced on the surface of the product, which has superconducting properties.
  • MgB 2 magnesium diboride layer
  • the method according to the invention is based on the idea that the starting material for the shaping process, in contrast to the conventional method, must have a surface that is as smooth as possible and that, in addition, a well-adhering lubricant layer is applied to this slightly rough surface.
  • the magnesium material is subjected to surface treatment before cold drawing, which smoothes the material to a high degree.
  • the smoothed material is then coated with a solid lubricant film with good adhesion and can then be drawn using conventional drawing dies, for example made of hard metal.
  • a magnesium rod with an initial diameter of 30 mm is extruded at a temperature of 350 ° C.
  • the extruded rod is peeled and drawn starting from 0 5.7 mm wire diameter over 4 steps at room temperature as follows:
  • this starting wire is coated with a solid lubricant of the R261 type, which contains polyvinyl alcohol as an adhesive component, from a liquid dispersion and dried.
  • the resulting solid film has calcium stearate as the lubricant base and enables the entire drawing process to be carried out without the additional use of lubricant.
  • the wire drawn in this way can then be further processed in the fine drawing process up to a diameter of ⁇ 1 mm, it being necessary for the surface of the wire to be subjected to smoothing between individual drawing stages.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (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

Verfahren zur Herstellung von strangförmigen Produkten aus Magnesium oder MagnesiumlegierungenProcess for the production of strand-like products from magnesium or magnesium alloys
Technisches GebietTechnical field
Die Erfindung betrifft ein Verfahren zur Herstellung von strangförmigen Produkten, wie Drähten, Stäben und Rohren, ausThe invention relates to a method for producing strand-like products, such as wires, rods and tubes, from
Magnesium oder Magnesiumlegierungen, durch Gleitziehen bei Raumtemperatur .Magnesium or magnesium alloys by sliding 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 process can be used, for example, as filler metals for laser beam welding of magnesium materials. However, they can also be used, for example, as a base for physico-chemical coatings, such as for the new magnesium diboride superconductor MgB 2 (J. Nagamatsu, N. Nagakawa, T. Muranaka, Y. Zenitani and J. Akimitsu: 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. 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 hexagonal- dichtgepacktes Gitter aufweist, Temperaturen von 220°C bis 370°C angewendet (J. A. Schey: Tπbology m Metalworkmg, ASM, Metals Park, Ohio, USA, 1984, S. 561).Methods for sliding drawing of strand-like products made of magnesium or magnesium alloys at room temperature are not known. The known, used forming processes of the cold forming of magnesium and its alloys relate to rolling, as a pure pressure forming, and sheet metal forming under less demanding forming conditions. Temperatures of 220 ° C to 370 ° C are already used in the deep-drawing of magnesium sheets due to the increased demands on the less ductile metal, which has a hexagonally tightly packed grid (JA Schey: Tπbology m Metalworkmg, 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. Kalpakηian: Manufactunng Processes for Engineering Materials, Addison-Wessley Publishing Company, Readmg, Massachusetts, USA, 1991, S.342) .It is also known that soaps and waxes are used as lubricants for light forming and that talc and graphite are used for more demanding forming at elevated temperatures (S. Kalpakηian: Manufacturing Processes for Engineering Materials, Addison-Wessley Publishing Company, Readmg, Massachusetts, USA, 1991, p.342).
Dagegen gibt es für das Kaltziehen von Drahten, Stangen oder Rohren aus Magnesiumwerkstoffen keine Empfehlungen über anzuwendende spezielle Schmierstoffe oder notigeOn the other hand, there are no recommendations for the use of special lubricants or necessary for the cold drawing of wires, rods or tubes made of magnesium materials
Oberflachenvorbehandlungen, weil der Vorgang bis heute offenbar technologisch nicht durchgeführt wird. Hierfür durfte sowohl die geringe Duktilitat des Magnesiums, als auch dessen kompliziertes tribologisches Verhalten die Ursache sein. Letzteres wird maßgeblich durch die gegenüber demSurface pretreatments, because the process is apparently still not carried out technologically. This may be due to the low ductility of the magnesium as well as its complicated tribological behavior. The latter is largely determined by the
Metall etwa 10-fach härtere Oxidschicht (P. L. Hurricks, WearMetal about 10 times harder oxide layer (P. L. Hurricks, Wear
15(1970), 389-409) und die ausgesprochen hohe chemische15 (1970), 389-409) and the extremely high chemical
Reaktivität des Magnesiums (G. V. Raynor: The Physical Metallurgy of Magnesium and its Alloys, Pergamon Press, 1959) bedingt .Reactivity of magnesium (G.V. Raynor: The Physical Metallurgy of Magnesium and its Alloys, Pergamon Press, 1959).
Des Weiteren ist es bekannt, dass die Oberflache schwer umformbarer metallischer Werkstoffe vor dem Ziehprozess gezielt rauher gemacht wird. Dies dient dem Zweck der besseren Einlagerung von Festschmierstoffen in die Oberflache selbst und damit einer gesteigerten Schmierwirksamkeit (J. A. Schey: Tribology m Metalworkmg, ASM, Metals Park, Ohio, USA, 1984) . Der rauhe Zustand der Oberflache 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 m Umfangsnchtung (M. Rehm und J. Eickemeyer: Reibung und Verschleiß, Hrsg. : DGM Informationsgesellschaft, Oberursel, 1996, S. 413-418) .Furthermore, it is known that the surface of metal materials that are difficult to form before the drawing process is deliberately made rougher. This serves the purpose of better storage of solid lubricants in the surface itself and thus an increased lubrication efficiency (JA Schey: Tribology in Metalworkmg, ASM, Metals Park, Ohio, USA, 1984). The rough state 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 of approximately 25 μm to 45 μm are characteristic of these initial roughnesses (E. Schultz: Stahl und Eisen 83 (1963) 866-870). However, they can also be considerably higher (E. Jaenichen et al.: Stahl und Eisen 77 (1957) 1785-1795). The relatively high initial roughness decreases more and more with increasing degrees of deformation from drawing step to drawing step. There is a leveling of the roughness mountains, both in longitudinal and in circumferential direction (M. Rehm and J. Eickemeyer: Reibung und Wear, ed .: DGM Informationsgesellschaft, Oberursel, 1996, pp. 413-418).
Bekannt ist auch, dass im Trockenziehbereich mit Pulverschmierstoffen auf Metallseifenbasis geschmiert wird, wobei zur Stabilisierung des Vorganges zusätzlich Schmierstofftragerschichten angewendet werden.It is also known that lubrication is carried out in the dry-drawing area with powder lubricants based on metal soap, additional lubricant carrier layers being used to stabilize the process.
Neuere, allerdings wenig angewendete Beschichtungssysteme mit gutem Haftvermögen auf dem Umformgut enthalten sowohl Schmier- als auch Tragerkomponenten ( J. Eickemeyer, H. Genest, J. Reichert und H.-R. Vogel: Umweltvertraglichere Schmierstoffe für das Kaltziehen. Tribologie und Schmierungstechnik 39(1992)6,334-338). Darstellung der ErfindungNewer, but rarely used coating systems with good adhesion to the material to be formed contain both lubrication and carrier components (J. Eickemeyer, H. Genest, J. Reichert and H.-R. Vogel: Environmentally compatible lubricants for cold drawing. Tribology and lubrication technology 39 ( 1992) from 6.334 to 338). Presentation of the invention
Der Erfindung liegt die Aufgabe zu Grunde, ein Verfahren zu schaffen, das die Herstellung von Magnesiumdrahten, -stangen und -röhren auf dem Wege des Kaltziehens ermöglicht.The invention is based on the object of providing a method which enables the production of magnesium wires, rods and tubes by cold drawing.
Diese Aufgabe wird mit einem Umformverfahren gelost, bei dem die Magnesiumwerkstoffe vor ihrer Umformung einer glattenden Oberflachenbearbeitung unterzogen werden, die eine möglichst geringe Oberflachenrauhigkeit 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 task is solved with a forming process in which the magnesium materials are subjected to a smooth surface treatment before they are formed, which ensures the lowest possible surface roughness, the mean surface roughness value R z <12 μm, and in which cold drawing using solid lubricant coatings adhering firmly to the material to be formed.
Gemäß einer vorteilhaften Ausgestaltung des Verfahrens wird die glattende Oberflachenbearbeitung derart ausgeführt, dass eine Oberflachenrauhigkeit mit einer gemittelten Rauhtiefe Rz von 2 bis 8 μm erzeugt wird.According to an advantageous embodiment of the method, the smooth surface treatment is carried out in such a way that a surface roughness with an average roughness depth R z of 2 to 8 μm is generated.
Zweckmaßigerweise wird die Oberflache der Magnesiumwerkstoffe mittels Ziehschalen oder Schleifen geglättet.The surface of the magnesium materials is expediently smoothed using drawing shells or grinding.
Die geglätteten Magnesiumwerkstoffe werden vor dem Kaltziehen mit einem festen, gut haftenden Schmierstofffilm durch Auftrocknen flussiger Schmiermitteldispersionen beschichtet.Before being cold drawn, the smoothed magnesium materials are coated with a firm, well-adhering lubricant film by drying up liquid lubricant dispersions.
Vorzugsweise können dabei Metallselfensysteme als Schmierstoff verwendet werden, die polymere Komponenten enthalten, wie Zellulosederivate oder Polyvmylalkohol, die zur Steigerung der Haftfähigkeit beitragen. Vor dem Kaltziehen können auch feste Schmierstofffilme durch Aufpressen plastischer oder pastenartiger Schmierstoffe oder Schmierstoffgemische aufgebracht werden.Metal selenium systems which contain polymeric components, such as cellulose derivatives or polyvinyl alcohol, which contribute to increasing the adhesiveness, can preferably be used as the lubricant. Before cold drawing, solid lubricant films can also be applied by pressing on plastic or paste-like lubricants or lubricant mixtures.
Das Kaltziehen wird mit Querschnittsabnahmen von 10 % bis 40 %, vorzugsweise mit Querschnittsabnahmen um 20 % durchgeführt .The cold drawing is carried out with a decrease in cross section of 10% to 40%, preferably with a decrease in cross section of 20%.
Das gezogene Produkt kann abschließend ziehgeschalt, uberschliffen oder durch Beizen von der Oxidhaut befreit werden. Danach kann das deckschichtfreie Produkt einer chemischen Reaktion unterworfen werden.The drawn product can finally be drawn-coated, smoothed over or freed from the oxide skin by pickling. The top layer-free product can then be subjected to a chemical reaction.
So kann beispielsweise auf der Oberflache m reinem Wasserstoff mit Diboran eine chemische Reaktion durchgeführt werden, durch die auf der Oberflache des Produktes eine Magnesiumdiborid-Schicht (MgB2) erzeugt wird, die supraleitende Eigenschaften hat.For example, a chemical reaction can be carried out on the surface in pure hydrogen with diborane, by means of which a magnesium diboride layer (MgB 2 ) is produced on the surface of the product, which has superconducting properties.
Dem erfmdungsgemaßen Verfahren liegt der Gedanke zu Grunde, dass das Ausgangsmaterial f r den Umformvorgang im Gegensatz zur üblichen Verfahrensweise eine möglichst glatte Oberflache haben muss und dass zudem auf dieser wenig rauhen Oberflache eine gut haftende SchmierstoffSchicht aufgebracht ist. Um dies zu erreichen, wird der Magnesiumwerkstoff vor dem Kaltziehen der Oberflachenbehandlung 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 shaping process, in contrast to the conventional method, must have a surface that is as smooth as possible and that, in addition, a well-adhering lubricant layer is applied to this slightly rough surface. To achieve this, the magnesium material is subjected to surface treatment before cold drawing, which smoothes the material to a high degree. The smoothed material is then coated with a solid lubricant film with good adhesion and can then be drawn using conventional drawing dies, for example made of hard metal.
Beim Ziehen mit Querschnittsabnahmen von vorzugsweise jeweils etwa 20 % tendiert die Oberflache 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 drawing with cross-sectional decreases of preferably about 20% each, the surface of the drawn material tends to increasing total decrease to become rougher. Therefore, after a few drawing stages, for example after about 60% reduction in cross-section, a heat treatment with subsequent surface smoothing by peeling again may be necessary before further drawing can take place. The person skilled in the art can easily decide whether the annealing and surface treatment is indicated or whether it can be easily pulled on. This procedure is to be maintained in the direction of diminishing dimensions, the roughening caused by the deformation being less and the ductility of the magnesium thus becoming better. The pulling with the solid lubricant films can be continued in the dimension range of a few tenths of a millimeter in order to produce fine Mg wire.
Weg zur Ausführung der ErfindungWay of carrying out the invention
Nachstehend ist die Erfindung an einem Ausführungsbeispiel näher erläutert.The invention is explained in more detail below using an exemplary embodiment.
Ein Magnesiumstab mit einem Ausgangsdurchmesser von 30 mm wird bei einer Temperatur von 350°C stranggepresst . Der stranggepresste Stab wird ziehgeschält und ausgehend von 0 5,7 mm Drahtdurchmesser über 4 Stufen bei Raumtemperatur wie folgt gezogen:A magnesium rod with an initial diameter of 30 mm is extruded at a temperature of 350 ° C. The extruded rod is peeled and drawn starting from 0 5.7 mm wire diameter over 4 steps at room temperature as follows:
05,7 mm - 05,2 mm → 04,9 mm → 04,3 mm -» 03,9 mm.05.7 mm - 05.2 mm → 04.9 mm → 04.3 mm - »03.9 mm.
Dies entspricht einer Gesamtquerschnittsabnahme von εg = 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 corresponds to a total decrease in cross section of ε g = 53.2%. Before the first drawing stage, this starting wire is coated with a solid lubricant of the R261 type, which contains polyvinyl alcohol as an adhesive component, from a liquid dispersion 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 the lubricant base and enables the entire drawing process to be carried out without the additional use of lubricant.
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 further processed in the fine drawing process up to a diameter of <1 mm, it being necessary for the surface of the wire to be subjected to smoothing between individual drawing stages.

Claims

Patentansprüche claims
1. Verfahren zur Herstellung von strangförmigen Produkten, wie Drähten, Stäben und Rohren, aus Magnesium oder Magnesiumlegierungen, dadurch gekennzeichnet, dass 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 dass das Kaltziehen unter Anwendung von auf dem Umformgut fest haftenden Festschmierstoff- Beschichtungen durchgeführt wird.1. A process for the production of strand-like products, such as wires, rods and tubes, made of magnesium or magnesium alloys, characterized in that the magnesium materials are subjected to a smooth surface treatment before their forming, which ensures the lowest possible surface roughness, the value of the average surface roughness R z must be <12 μm, and that cold drawing is carried out using solid lubricant coatings that adhere firmly to the material to be formed.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass mit der glättenden Oberflächenbearbeitung eine Oberflächenrauhigkeit mit einer gemittelten Rauhtiefe Rz von 2 bis 8 μm erzeugt wird.2. The method according to claim 1, characterized in that a surface roughness with an average roughness R z of 2 to 8 microns is generated with the smoothing surface treatment.
3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Oberfläche der Magnesiumwerkstoffe mittels Ziehschälen geglättet wird.3. The method according to claim 1, characterized in that the surface of the magnesium materials is smoothed by means of peeling.
4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Oberfläche der Magnesiumwerkstoffe mittels Schleifen geglättet wird.4. The method according to claim 1, characterized in that the surface of the magnesium materials is smoothed by grinding.
5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die geglätteten Magnesiumwerkstoffe vor dem Kaltziehen mit einem festen, gut haftenden Schmierstofffilme durch Auftrocknen flüssiger Schmiermitteldispersionen beschichtet werden. 5. The method according to claim 1, characterized in that the smoothed magnesium materials are coated with a solid, well-adhering lubricant films by drying liquid lubricant dispersions before cold drawing.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass vorzugsweise Metallseifensysteme als Schmierstoff verwendet werden, die polymere Komponenten enthalten, wie Zellulosederivate oder Polyvinylalkohol, die zur Steigerung der Haftfähigkeit beitragen.6. The method according to claim 5, characterized in that metal soap systems are preferably used as the lubricant, which contain polymeric components, such as cellulose derivatives or polyvinyl alcohol, which contribute to increasing the adhesiveness.
7. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass vor dem Kaltziehen feste Schmierstofffilme durch Aufpressen plastischer oder pastenartiger Schmierstoffe oder Schmierstoffgemische aufgebracht werden.7. The method according to claim 1, characterized in that solid lubricant films are applied by pressing plastic or paste-like lubricants or lubricant mixtures before cold drawing.
8. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Kaltziehen mit Querschnittsabnahmen von 10 % bis 40 %, vorzugsweise mit Querschnittsabnahmen um 20 % durchgeführt wird.8. The method according to claim 1, characterized in that the cold drawing is carried out with cross-sectional decreases from 10% to 40%, preferably with cross-sectional decreases by 20%.
9. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Kaltziehen mit Hartmetallziehsteinen durchgeführt wird.9. The method according to claim 1, characterized in that the cold drawing is carried out with hard metal drawing blocks.
10. Verfahren nach Anspruch 1 bis 9, dadurch gekennzeichnet, dass das gezogene Produkt abschließend ziehgeschält, überschliffen oder durch Beizen von der Oxidhaut befreit wird, und dass danach das deckschichtfreie Produkt einer chemischen Reaktion unterworfen wird, vorzugsweise mit Diboran in reinem Wasserstoff, durch die auf der Oberfläche des Produktes eine Magnesiumdiborid-Schicht (MgB2) erzeugt wird, die supraleitende Eigenschaften hat. 10. The method according to claim 1 to 9, characterized in that the drawn product is finally peeled, ground or freed from the oxide skin by pickling, and that the top layer-free product is then subjected to a chemical reaction, preferably with diborane in pure hydrogen, through which A magnesium diboride layer (MgB 2 ) is created on the surface of the product, which has superconducting properties.
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)

Application Number Priority Date Filing Date Title
DE10142204A DE10142204A1 (en) 2001-08-24 2001-08-24 Process for the production of strand-like products from magnesium or magnesium alloys
DE10142204 2001-08-24
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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EP1420899A1 true EP1420899A1 (en) 2004-05-26
EP1420899B1 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 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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DE10142204A1 (en) 2003-03-06
WO2003018225A1 (en) 2003-03-06
DE50204707D1 (en) 2005-12-01
ATE307691T1 (en) 2005-11-15
EP1420899B1 (en) 2005-10-26

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