EP0822016B1 - Verfahren zur Herstellung eines bimetallischen Materials - Google Patents

Verfahren zur Herstellung eines bimetallischen Materials Download PDF

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Publication number
EP0822016B1
EP0822016B1 EP97660073A EP97660073A EP0822016B1 EP 0822016 B1 EP0822016 B1 EP 0822016B1 EP 97660073 A EP97660073 A EP 97660073A EP 97660073 A EP97660073 A EP 97660073A EP 0822016 B1 EP0822016 B1 EP 0822016B1
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EP
European Patent Office
Prior art keywords
extrusion
bimetallic
essentially
extruded
extrusion machine
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.)
Expired - Lifetime
Application number
EP97660073A
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English (en)
French (fr)
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EP0822016A1 (de
Inventor
Vanhatalo Voitto
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.)
Luvata Oy
Original Assignee
Outokumpu Copper Products Oy
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Publication date
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Publication of EP0822016A1 publication Critical patent/EP0822016A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/005—Continuous extrusion starting from solid state material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/22—Making metal-coated products; Making products from two or more metals
    • B21C23/24—Covering indefinite lengths of metal or non-metal material with a metal coating

Definitions

  • the present invention relates to a method for producing bimetallic material of a superconductor material in a continuous process, so that the number of working steps in the process can be essentially reduced.
  • bimetallic material means a metal product formed of two metal components, where the components are either metals as such or metal alloys.
  • the components are either metals as such or metal alloys.
  • bimetallic materials let us point out for instance a metal product formed of copper and of columbic titanium filaments contained therein used as superconductor.
  • a superconductor which is high in copper and low in columbic titanium can be produced for instance as a channel conductor, where the columbic titanium serving as the superconductor is joined to a groove in the copper profile by means of soldering.
  • the insulation is generally carried out by means of an enamelling process. In enamelling, the processing temperature of the channel conductor rises above the soldering temperature, in which case the soldering joint breaks open and the conductor is destroyed.
  • a superconductor which is high in copper and low in columbic titanium can also be produced as a monolithic conductor, where columbic titanium is first packed inside the copper, and the ready-made superconductor is obtained as a final product from a production line including several working steps and heat treatments. From the point of view of the outcome, the multi-step production process is necessary for the columbic titanium only; when produced like this, copper is part of the conductor and passes there along at all stages.
  • a monolithic conductor is not so desirable as a channel conductor, but a monolithic conductor can be insulated in the enamelling process without damaging the conductor.
  • the Conform method In continuous extrusion, there is often applied a method described in the GB patent 1,370,894, called the Conform method.
  • the material to be extruded is conducted into a groove formed on the outer circumference of a wheel-like member. While the wheel turns around its axis, the material to be extruded enters into contact with a co-operating shoe structure essentially filling the groove, so that the motion of the material to be extruded is changed in relation to the wheel-like member.
  • the material is rendered to be extruded in the proceeding direction thereof, prior to the shoe structure or through an extrusion aperture provided in the shoe.
  • the JP patent application 55042139 relates to a production of composite deformed bar.
  • the production is carried out in a continuously operated extrusion machine where an aluminium wire and a steel strip are introduced together, in overlapped form, into a container corresponding passage formed between a grooved wheel and a shoe block.
  • the both metals extruded are pulled into the passage, and the aluminium wire tends to be delayed until reaching the die corresponding part.
  • the both metals are pressure-welded firmly in the boundary surface.
  • the extruded bar is removed from the continuous extrusion machine mainly in the tangential direction; only the excess of the aluminium material is removed in the radial direction.
  • the working degree by extrusion is thus very low and also the temperature is substantially low based on the temperature required for aluminium.
  • the JP patent application 56041015 relates to a continuous manufacture of a composite rod by extruding the composite material through a die.
  • the soft coating material as aluminium is fed into a hollow groove and at the same time the hard strip as stainless steel sheet is sent into the cavity formed by a circumferential end plane of the roll and the hollow groove under the condition that the strip material is tight pressed to the circumferential end plane of the roll.
  • the composite material is pushed into a space in the depth of the cavity by the friction force between the composite material and the wall surface of the hollow groove, and hereby, the soft coating material is pressure welded to one side of the hard strip material.
  • the JP patent application 55042139 and the JP patent application 56041015 relate to the continuous extrusion process where the coating material is welded to one side of a sheet or strip material.
  • the object of the present invention is to eliminate some of the drawbacks of the prior art and to achieve an improved and more economical in costs method for producing bimetallic material in continuous extrusion where one bimetallic component is located centrally as a core material.
  • the bimetallic material to be produced is extruded in a continuously operated extrusion machine, such as a Conform machine, so that the material flows in an essentially laminar fashion throughout the working process. Moreover, the bimetallic material is removed from the continuous extrusion machine essentially in the radial direction.
  • the bimetallic material is a superconductor material which is for instance high in copper and low in columbic titanium, and it is advantageously obtained the length of the state-of-the-art channel conductor and the insulation capacity of the monolithic conductor.
  • the bimetallic component with a larger volume e.g. copper
  • the bimetallic component with a smaller volume e.g. columbic titanium
  • the bimetallic material to be extruded is a superconductor material that is high in copper and low in columbic titanium, the mixing of the different bimetallic components must be prevented. Consequently, the bimetallic blank obtained from the feed member of a continuously operated extrusion machine is conducted into extrusion, so that the bimetallic material flows in an essentially laminar fashion throughout the extrusion process. Moreover, because the components of the bimetallic material are in mutual contact already at the feeding stage, the extruded bimetallic material can be removed from the extrusion machine in an essentially radial direction with respect to the wheel-like feeding device of the extrusion machine.
  • the co-operating shoe structure essentially filling the groove of the feed member in a continuously operated extrusion machine, as well as the extrusion member containing the extrusion aperture, are advantageously designed so that there is obtained an essentially laminar flow of the material to be extruded for the duration of the whole extrusion process.
  • the channel leading to the extrusion aperture provided in the extrusion member must, at least as for the first wall in the feeding direction of the material to be extruded, be designed so that the radius of curvature at the beginning of the channel wall is at least 70 percentages, advantageously 80 - 90 percentages, of the largest diameter of the extrusion aperture, when the aperture is for example oval-shaped, or of the diameter of the extrusion aperture, when the aperture is round.
  • the co-operating shoe member essentially filling the groove of the feed member of the extrusion machine is designed so that the co-operating shoe forms an essentially concentric circular curve with the first wall in the feeding direction of the material of the channel leading to the extrusion aperture.
  • the co-operating shoe can also be rendered in the desired shape so that the material to be extruded as such forms a non-flowing area in front of the co-operating shoe, and at the border surface of the non-flowing and flowing areas the non-flowing area forms, in the feeding direction of the material of the channel leading to the extrusion aperture, an essentially concentric circular curve with the first wall, advantageously for a section corresponding a central angle of 40 degrees at maximum, when starting from the changing point of the flow and seen in the feeding direction of the material.
  • the bimetallic component with a smaller volume e.g. columbic titanium
  • the desired core material surrounded by a jacket made of the material with a larger volume, e.g. copper.
  • this kind of production of the bimetallic material is carried out in a one-step continuous process, while the extrusion ratio is such that the extrusion temperature is at least 600° C.
  • the different components 1 and 2 of the desired bimetallic material are fed into the feeding device 4 of a continuously operated extrusion machine 3.
  • the component 1 is formed as a grooved profile, and the component 2 is inserted in the groove thereof.
  • the feeding device 4 is essentially wheel-like, and the components 1 and 2 are together fed into the groove provided on the outer circumference of the feeding device 4.
  • the feeding device 4 transfers a bimetallic blank 5 containing the components 1 and 2 to the extrusion zone.
  • a co-operating shoe member 6 filling the groove of the feeding device 4 guides the bimetallic blank to the extrusion aperture 7.
  • the first wall 9 in the feeding direction of the extrusion member 8 is rounded, so that the radius of curvature of the wall 9 is 80 percentages of the diameter of the extrusion aperture 7.
  • a non-flowing area 10 in front of the co-operating shoe 6 there is formed, of at least part of the material to be extruded, a non-flowing area 10, the border surface 11 with the flowing material whereof forms an essentially concentric circular curve with the wall 9 for the section that corresponds to a central angle ⁇ of about 35 degrees, when starting from the point of change of the flow and seen in the feeding direction of the material.
  • the border surface 11 extends from the groove on the outer circumference of the feeding device 4 to the wall 12 of the extrusion machine.
  • the extruded, ready-made bimetallic material is discharged from the continuously operated extrusion machine 3 in an essentially radial direction with respect to the wheel of the feeding device 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Extrusion Of Metal (AREA)

Claims (6)

  1. Ein Verfahren zur einer in einem Schritt erfolgenden Herstellung eines bimetallischen Materials aus supraleitendem Material in einer kontinuierlich betriebenen Extrusionsmaschine (3), bei welchem die Bimetallkomponenten (1,2) zusammen in die Extrusionszone geführt werden und das Bimetallmaterial (1,2) die Extrusionsmaschine (3) im Wesentlichen in radialer Richtung in Bezug auf den äußeren Umkreis der Zufuhrvorrichtung (4) verlässt, und bei welchem die in einem größeren Volumen zugeführte Komponente (1) zu einem genuteten Profil geformt wird und die in einem kleineren Volumen zugeführte Komponente (2) in die Nut desselben eingefügt wird, so dass das zu extrudierende bimetallische Material (1,2) den Extrusionsvorgang im Wesentlichen in laminarer Form durchläuft, so dass die im kleineren Volumen auftretende Bimetallkomponente (2) zentral gelegen und von einem aus dem im größeren Volumen auftretenden Material (1) geformten Mantel umgeben ist.
  2. Ein Verfahren nach Anspruch 1, gekennzeichnet dadurch, dass zum Erreichen eines im Wesentlichen laminaren Stroms die Konterfläche (11) des Formschuhs (6) der Extrusionsmaschine zusammen mit der, in Zufuhrrichtung des Extrusionsmaterials gesehen, im Wesentlichen zuerst gelegenen Wand (9) eine im Wesentlichen konzentrische kreisförmige Kurve bildet, die sich vorteilhaft über einen Bereich erstreckt, der einem Mittelwinkel (α) von maximal 40 Grad entspricht, beginnend am Änderungspunkt des Zuflusses und gesehen in Zufuhrrichtung der Komponenten (1, 2).
  3. Ein Verfahren entsprechend Anspruch 2, gekennzeichnet dadurch, dass die Aufprallfläche des Formschuhs (6) zumindest zum Teil von dem zu extrudierendem Material gebildet wird.
  4. Ein Verfahren entsprechend einem der vorstehenden Ansprüche, gekennzeichnet dadurch, dass die, in Zufuhrrichtung des Extrusionsteils (8) gesehen, zuerst gelegene Wand (9) in einer Weise gerundet ist, dass der Krümmungsradius der Wand (9) mindestens 70 Prozent, besser aber 80 - 90 Prozent des größten Durchmessers der Extrusionsöffnung (7) beträgt.
  5. Ein Verfahren entsprechend einem der vorstehenden Ansprüche, gekennzeichnet dadurch, dass die Extrusionstemperatur mindestens 600° C beträgt.
  6. Ein Verfahren entsprechend einem der vorstehenden Ansprüche, gekennzeichnet dadurch, dass es sich bei dem Material mit dem größeren Volumen um Kupfer handelt.
EP97660073A 1996-06-26 1997-06-24 Verfahren zur Herstellung eines bimetallischen Materials Expired - Lifetime EP0822016B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI962628 1996-06-26
FI962628A FI101457B1 (fi) 1996-06-26 1996-06-26 Tapa valmistaa bimetallimateriaali

Publications (2)

Publication Number Publication Date
EP0822016A1 EP0822016A1 (de) 1998-02-04
EP0822016B1 true EP0822016B1 (de) 2002-09-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97660073A Expired - Lifetime EP0822016B1 (de) 1996-06-26 1997-06-24 Verfahren zur Herstellung eines bimetallischen Materials

Country Status (3)

Country Link
EP (1) EP0822016B1 (de)
DE (1) DE69715332T2 (de)
FI (1) FI101457B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4674543A1 (de) * 2024-07-01 2026-01-07 BWE Limited Extrusionsmaschine und extrusionsverfahren

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9924160D0 (en) 1999-10-12 1999-12-15 Bwe Ltd Continuous extrusion apparatus
GB9924161D0 (en) 1999-10-12 1999-12-15 Bwe Ltd Copper tubing

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2720122C2 (de) * 1977-05-05 1987-04-02 Aluminium-Walzwerke Singen Gmbh, 7700 Singen Strangpresse zum Herstellen von Profilen aus draht- oder Stangenförmigem Ausgangsprofil
JPS5542139A (en) * 1978-09-19 1980-03-25 Hitachi Cable Ltd Production of composite deformed bar
JPS5641015A (en) * 1979-09-12 1981-04-17 Hitachi Cable Ltd Manufacture of composite rod

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4674543A1 (de) * 2024-07-01 2026-01-07 BWE Limited Extrusionsmaschine und extrusionsverfahren

Also Published As

Publication number Publication date
DE69715332T2 (de) 2003-05-22
DE69715332D1 (de) 2002-10-17
EP0822016A1 (de) 1998-02-04
FI962628L (fi) 1997-12-27
FI962628A0 (fi) 1996-06-26
FI101457B (fi) 1998-06-30
FI101457B1 (fi) 1998-06-30

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