CH339897A - Process for the production of copper wire coated with aluminum - Google Patents
Process for the production of copper wire coated with aluminumInfo
- Publication number
- CH339897A CH339897A CH339897DA CH339897A CH 339897 A CH339897 A CH 339897A CH 339897D A CH339897D A CH 339897DA CH 339897 A CH339897 A CH 339897A
- Authority
- CH
- Switzerland
- Prior art keywords
- aluminum
- copper wire
- metal foil
- rolling
- production
- Prior art date
Links
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims description 20
- 229910052782 aluminium Inorganic materials 0.000 title claims description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 20
- 238000000034 method Methods 0.000 title claims description 14
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 238000005096 rolling process Methods 0.000 claims description 11
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 10
- 239000011888 foil Substances 0.000 claims description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 229910000765 intermetallic Inorganic materials 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims 1
- 230000001419 dependent effect Effects 0.000 claims 1
- 229910052709 silver Inorganic materials 0.000 claims 1
- 239000004332 silver Substances 0.000 claims 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 5
- 238000005253 cladding Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
- B21C37/042—Manufacture of coated wire or bars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/22—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded
- B23K20/233—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded without ferrous layer
- B23K20/2333—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded without ferrous layer one layer being aluminium, magnesium or beryllium
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Metal Extraction Processes (AREA)
Description
Ivor Manning, Sutton Coldfield (Warwickshire, Grossbritannien), ist als Erfinder genannt worden Vorliegende Erfindung bezieht sich auf ein Ver fahren zur Herstellung von mit Aluminium über zogenem Kupferdraht nach dem Walz- und Ziehver fahren.
Für gewisse elektrische Anwendungsgebiete ist es erwünscht, mit Aluminium überzogenen Kupferdraht zu verwenden. Um solche Drähte herzustellen, wurde vorgeschlagen, ein Kupferknüppel zu versilbern, und bevor er gewalzt und gezogen wird, den versilberten Knüppel mit einer Manschette aus Aluminium zu ver sehen. So hergestellter Draht ist nicht immer befrie digend, da die Plattierung dazu neigt, beim Walzen zu reissen. Ferner ist die für grosse Knüppel erforderliche grössere Dicke der Plattierung unwirtschaftlich. .
Zweck der vorliegenden Erfindung ist die Be schaffung eines neuen Verfahrens zur Herstellung von mit Aluminium überzogenem Kupferdraht.
Gemäss der Erfindung umfasst das Verfahren zur Herstellung von mit Aluminium überzogenem Kupfer draht durch Walzen und Ziehen die Massnahmen, einen Kupferknüppel mit einer Metallfolie zu umhül len, die die Bildung von spröden intermetallischen Verbindungen während des Walzens verhindert, um diese Folie herum eine Aluminiummanschette anzu ordnen, den Zwischenraum zwischen Folie und Kup fer sowie zwischen Folie und Aluminium mit einem inerten Gas zu füllen und das Gas abzuschliessen, bevor man den Walz- und Ziehvorgang durchführt.
Gemäss einer beispielsweisen Ausführungsform des Verfahrens wird ein Kupferknüppel mit rundem Querschnitt von 50,8 mm Durchmesser in eine Silber folie eingeschlagen. Die Folie hat eine Dicke von 0,254 mm. Ein Aluminiumrohr, dessen Innendurch messer wenig grösser ist als der Aussendurchmesser des eingeschlagenen Kupferknüppels und eine Wanddicke von<B>3,175</B> mm aufweist, wird nun um die Silber- folie herum angebracht, wodurch ein mehrschichtiger Knüppel entsteht.
Da die Silberfolie nur um den Kupferknüppel geschlagen ist und die Aluminiummanschette gleitend auf die Folie passt, ergeben sich von einem Ende des mehrschichtigen Knüppels zum andern kleine luft gefüllte Zwischenräume. Der Spalt zwischen den Tei len des mehrschichtigen Knüppels wird am einen Ende desselben durch Argon-Lichtbogenschweissung verschlossen und am andern Ende die Luft durch Evakuieren entfernt. Die Zwischenräume werden hierauf mit einem inerten Gas, wie Argon, gefüllt, und das andere Ende des Knüppels ebenfalls verschlossen, um das Gas im Innern einzuschliessen.
Der mehrschichtige Knüppel wird dann heiss und kalt gewalzt und auf die gewünschte Drahtdicke ge zogen. Der so erhaltene Draht hatte eine Leitfähig- keit, die praktisch 90% derjenigen von reinem Kupfer betrug.
Infolge der Silberfolie entstehen weder während des Walzens noch während des anschliessenden An lassens spröde intermetallische Verbindungen. Das Argon verhindert die Oxydation des Kupfers und begrenzt ausserdem die Oxydation des Aluminiums während des Erhitzens.
In gewissen Fällen kann das Walzen zur Bil dung eines Drahtes führen, bei dem der Aluminium- überzug im Querschnitt nicht gleichmässig dick ist. Um dies praktisch zu vermeiden, kann man die Alumi niumhülse mit im Querschnitt sich ändernder Dicke ausbilden und während des Walzprozesses derart mit den Walzen ausrichten, dass ein Draht erhalten wird, dessen Überzug im Querschnitt praktisch gleichmässig dick ist.
Ivor Manning, Sutton Coldfield (Warwickshire, Great Britain) has been named as the inventor. The present invention relates to a process for the production of aluminum over drawn copper wire after the rolling and drawing process.
For certain electrical applications it is desirable to use aluminum clad copper wire. In order to produce such wires, it has been proposed to silver-plate a copper billet and, before it is rolled and drawn, to see the silver-plated billet with an aluminum sleeve. Wire produced in this way is not always satisfactory, as the cladding tends to crack during rolling. Furthermore, the greater thickness of the cladding required for large billets is uneconomical. .
The purpose of the present invention is to provide a new process for producing aluminum-clad copper wire.
According to the invention, the method for producing aluminum-coated copper wire by rolling and drawing includes the measures to enclose a copper billet with a metal foil that prevents the formation of brittle intermetallic compounds during rolling, and to arrange an aluminum sleeve around this foil To fill the gap between the foil and the copper and between the foil and aluminum with an inert gas and shut off the gas before the rolling and drawing process is carried out.
According to an exemplary embodiment of the method, a copper billet with a round cross-section of 50.8 mm diameter is wrapped in a silver foil. The film has a thickness of 0.254 mm. An aluminum tube, the inside diameter of which is slightly larger than the outside diameter of the hammered copper billet and a wall thickness of <B> 3.175 </B> mm, is now attached around the silver foil, creating a multi-layer billet.
Since the silver foil is only wrapped around the copper billet and the aluminum sleeve slides onto the foil, there are small air-filled gaps from one end of the multi-layer billet to the other. The gap between the parts of the multilayered billet is closed at one end by argon arc welding and the air is removed at the other end by evacuation. The gaps are then filled with an inert gas, such as argon, and the other end of the stick is also closed in order to lock the gas inside.
The multi-layer billet is then hot and cold rolled and drawn to the desired wire thickness. The wire obtained in this way had a conductivity which was practically 90% that of pure copper.
As a result of the silver foil, brittle intermetallic compounds are not formed either during rolling or during the subsequent tempering. The argon prevents the oxidation of the copper and also limits the oxidation of the aluminum during heating.
In certain cases, rolling can lead to the formation of a wire in which the aluminum coating is not uniformly thick in cross-section. In order to practically avoid this, the aluminum sleeve can be formed with a thickness that changes in cross section and aligned with the rollers during the rolling process in such a way that a wire is obtained whose coating is practically uniform in cross section.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB339897X | 1954-12-01 | ||
GB141155X | 1955-11-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH339897A true CH339897A (en) | 1959-07-31 |
Family
ID=26250320
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH339897D CH339897A (en) | 1954-12-01 | 1955-11-22 | Process for the production of copper wire coated with aluminum |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH339897A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0067906A2 (en) * | 1981-06-15 | 1982-12-29 | Kabel- und Metallwerke Gutehoffnungshütte Aktiengesellschaft | Method for the production of seamless copper pipes |
-
1955
- 1955-11-22 CH CH339897D patent/CH339897A/en unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0067906A2 (en) * | 1981-06-15 | 1982-12-29 | Kabel- und Metallwerke Gutehoffnungshütte Aktiengesellschaft | Method for the production of seamless copper pipes |
EP0067906A3 (en) * | 1981-06-15 | 1983-03-30 | Kabel- und Metallwerke Gutehoffnungshütte Aktiengesellschaft | Method for the production of seamless copper pipes |
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