Hitachi Cable, Inc.

Koichi Tamura

Seigi Aoyama

Takaaki Ichikawa

Hakaru Matsui

Osamu Seya

Ryohei Okada

Takahiro Sato

Hajime Abe

Kenkichi Yamaji

Hideo Kawano

Oelhschlagel Dietrich

Kiyoshi Shimojima

Takamitsu Kimura

Masato Watabe

Hiroshi Komuro

Fumitaka Nakahigashi

Shigetoshi Goto

A process for forming an ultrafine copper alloy wire is provided. The alloy includes a copper matrix of high purity copper having a total unavoidable impurity content of not more than 10 mass ppm. The matrix contains 0.05 to 0.9 mass % of at least one metallic element of the group of tin, indium, silver, antimony, magnesium, aluminum, and boron. The alloy is melted in a carbon crucible. The molten alloy is cast into a wire rod utilizing a carbon mold. The wire rod is then subjected to a primary wire drawing, an annealing, and a secondary wire drawing. The produced ultrafine copper alloy wire has excellent tensile strength, electrical conductivity, and drawability.

Process for forming an ultrafine copper alloy wire

This invention provides a composite conductor having excellent strength, flexing resistance and corrosion resistance, a production method thereof and a cable employing the same composite conductor. A corrosion resistant layer is formed of Au, Ag, Sn, Ni, solder, Zn, Pd, Sn&mdash;Ni alloy, Ni&mdash;Co alloy, Ni&mdash;P alloy, Ni&mdash;Co&mdash;P alloy, Cu&mdash;Zn alloy, Sn&mdash;Bi alloy, Sn&mdash;Ag&mdash;cu alloy, Sn&mdash;Cu alloy or Sn&mdash;Zn alloy in the thickness of 0.5 &mgr;m or more on an external periphery of a core made of copper-metal fiber conductor. A wire material made of the copper-metal fiber conductor is subjected to area reduction processing. In the middle of the area reduction processing or after the area reduction processing is completed, corrosion resistant layer is formed on the periphery of the wire material in the thickness of 0.5 &mgr;m or more by plating with Au, Ag, Sn, Ni, solder, Zn, Pd, Sn&mdash;Ni alloy, Ni&mdash;Co alloy, Ni&mdash;P alloy, Ni&mdash;Co&mdash;P alloy, Cu&mdash;Zn alloy, Sn&mdash;Bi alloy, Sn&mdash;Ag&mdash;Cu alloy, Sn&mdash;Cu alloy or Sn&mdash;Zn alloy.

Composite conductor, production method thereof and cable using the same

In an extrafine or ultrafine copper alloy wire having an outer diameter of not more than 0.1 mm, the copper alloy wire is formed of a heat treated copper alloy comprising 0.05 to 0.9% by weight in total of at least one metallic element selected from the group consisting of tin, indium, silver, antimony, magnesium, aluminum, and boron and not more than 50 ppm of oxygen with the balance consisting of copper. By virtue of this constitution, the extrafine or ultrafine copper alloy wire has a combination of excellent bending fatigue lifetime based on high tensile strength and excellent torsional strength based on high elongation or a combination of excellent tensile strength, electrical conductivity, and drawability and good elongation. The invention has been described in detail with particular reference to preferred embodiments, but it will be understood that variations and modifications can be effected within the scope of the invention as set forth in the appended claims.

Extrafine copper alloy wire, ultrafine copper alloy wire, and process for producing the same

An ultrafine copper alloy wire drawn to a diameter of not more than 0.08 mm is provided which is formed of an alloy having a copper matrix of high purity copper with a total unavoidable impurity content of not more than 10 mass ppm. Contained in the matrix is 0.05 to 0.9 mass % of at least one metallic element selected from the group including tin, indium, silver, antimony, magnesium, aluminum, and boron. By virtue of this constitution, the ultrafine copper alloy wire has excellent tensile strength, electrical conductivity, and drawability.

Ultrafine copper alloy wire and process for producing the same

It is an object of the invention to provide an electrode wire for an electrical discharge machining apparatus, which is low-priced in cost of production, has sufficient conductivity and strength at high temperature and is suited for improving the speed of electrical discharge machining. Cu&mdash;Zn alloy covering layer is formed around a core metallic wire formed of Cu&mdash;0.02 to 0.2 Zr alloy or Cu&mdash;0.15 to 0.25 Sn&mdash;0.15 to 0.25 In alloy.

Electrode wire for electrical discharge machining apparatus

The invention relates to a method for manufacturing an electrode wire for an electrical discharge machining apparatus, which is composed of a core wire formed of Cu or Cu-alloy and a covering layer formed of brass. A brass tape is longitudinally applied around a core wire to provide a pipe, a seam formed by butting longitudinal edges of the brass tape is continuously welded to provide a composite wire, area-reduction process of reduction rate less than 65% is applied to the brass pipe by means of a squeezing die, a heat treatment at a temperature higher a recrystallization one of brass is applied to the composite pipe, and thereafter the composite wire is processed to be reduced in area through plural reducing dies step by step.

Method for manufacturing electrode wire for electrical discharge machining apparatus

An addition material in powder or particulate form comprising at least one addition agent selected from the group consisting of calcium, magnesium and aluminum is extruded to provide a compact core wire, which is enveloped by a tape of iron or steel. The tape is circularly shaped such that one widthwise marginal portion is folded tightly over the other widthwise marginal portion in overlapping relation. The tape thus shaped serves as a protective covering for the core wire. Great lengths of continuous wire can be manufactured by the continuous production process. The wire shaped composite addition material produced in this way is added to molten iron and steel by means of continuous wire feeding and hereby provides for effective deoxidation and desulfurization of such melts. Furthermore the linear additive is easy to handle and to store.

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Ibaraki, Japan

Koichi Tamura