JP2661462B2 - Straight line excellent in repeated bending property: Cu alloy ultrafine wire of 0.1 mm or less - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an excellent wire-drawing processability which enables wire-drawing to an ultra-fine wire having a diameter of 0.1 mm or less without occurrence of breakage, and further excellent repetitive bending property. This relates to a Cu alloy ultrafine wire having a diameter of 0.1 mm or less.

[0002]

2. Description of the Related Art It is well known that many Cu alloy fine wires are conventionally used for wiring of industrial robots and various electronic and electrical devices.

[0003]

On the other hand, in recent years, industrial robots and electronic and electric equipment have been remarkably reduced in size, higher in performance, and more multifunctional, and accordingly, the wiring has been becoming more and more dense. For Cu alloy thin wires used for wiring, it is strongly desired to further reduce the diameter from the viewpoint of weight reduction. In the case of a conventional Cu alloy thin wire, the diameter is reduced to 0.1 m.
If it is attempted to obtain an ultrafine wire having a diameter of 0.1 m or less, it is not easily drawn because it does not have good drawability. At the time of wiring or practical use, it is difficult to meet the demand for a smaller diameter at present.

[0004]

Means for Solving the Problems Accordingly, the present inventors have
From the above-mentioned viewpoints, as a result of researching to develop a Cu alloy ultrafine wire having excellent wire drawing workability and excellent repetitive bendability even when the wire is thinned, the fine wire is expressed in terms of% by weight (hereinafter,%). Indicates weight%), Mg: 0.1-1%, P: 0.001-0.02
%, And the balance is composed of Cu and inevitable impurities, and the content of oxygen and sulfur as inevitable impurities is oxygen: 8 ppm or less, sulfur: 8 ppm or less. The resulting thin wire has sufficient strength and conductivity that can be practically used, and has excellent drawability, so that the diameter of the wire is 0.1 mm or less in a state where the occurrence of disconnection is significantly suppressed. It can be made into an ultra-fine wire, and even if it is thinned to a diameter of 0.1 mm or less in this way, it has excellent repetitive bendability, so that it is not broken at the time of wiring and practical use,
The research results proved to be highly reliable.

The present invention has been made on the basis of the above research results, and the reason why the composition of the Cu alloy constituting the ultrafine wire is limited as described above will be described below. (A) Mg The Mg component has an effect of improving the strength and the repetitive bendability without significantly lowering the conductivity. If the content is less than 0.1%, a desired effect can be obtained in the above effect. On the other hand, if the content exceeds 1%, the wire drawing workability will decrease, so that the content is 0.1 to 1%.
It was decided.

(B) The P component has an effect of forming an intermetallic compound which is finely precipitated on the substrate by combining with Mg, thereby further improving the repetitive bending property, but its content is 0.001%. When the content is less than 0.02%, the desired effect of improving the bending property cannot be obtained.
The intermetallic compound becomes coarse, and the wire is easily broken during wire drawing.
It was determined as 1 to 0.02%.

(C) Oxygen and sulfur Oxygen and sulfur components, which are inevitable impurities, have a property that greatly affects the drawability. For oxygen, 8 ppm, and for sulfur, 8 ppm. When both are less than this, the wire drawing workability is dramatically improved, and it becomes possible to perform wire drawing to an ultrafine wire having a diameter of 0.1 mm or less without occurrence of disconnection. It was determined that the content of sulfur was 8 ppm or less and the sulfur content was 8 ppm or less.

[0008]

Next, the Cu alloy ultrafine wire of the present invention will be described in detail with reference to examples. Oxygen-free copper is charged into a high-frequency melting furnace, and the furnace is kept in a vacuum atmosphere of 10 ^-3 torr,
This state is maintained for a predetermined time within a range of 30 to 90 minutes by melting the molten metal and reducing the oxygen and sulfur in the molten metal by high frequency induction stirring and a vacuum atmosphere. Was adjusted to a predetermined content, and subsequently, predetermined amounts of a Cu-50Mg alloy and a Cu-15% P alloy were added to adjust a molten Cu alloy having a component composition shown in Tables 1 and 2, respectively. Thereafter, this is cast into a cold water mold to form a casting soul having a size of diameter: 80 mm × length: 200 mm, and the ingot is subjected to face milling of thickness: 5 mm, at 750 to 850 ° C. Is subjected to hot extrusion at a predetermined temperature within the range described above to obtain a rough drawn wire having a diameter of 10 mm, and after pickling, it is formed into a wire having a diameter of 2.5 mm by cold drawing, and the wire is 350 to 500 mm. For 2 hours at a given temperature in the range of ℃ 2kg of wire was taken out from the wire, and repeatedly subjected to cold drawing to obtain ultra-fine Cu alloy wires 1 to 10 each having a diameter of 0.08 mm. Cu alloy ultrafine wires 1 to 6 were respectively manufactured.

[0009]

[Table 1]

[0010]

[Table 2]

For the purpose of evaluating the drawability, in the above embodiment, a wire having a diameter of 2.5 mm was used.
The number of times the wire was broken during drawing to an ultrafine wire of 0.08 mm was measured. The comparative Cu alloy ultrafine wires 1 to 6 are those in which the content of any one of the components in the Cu alloy constituting the Cu alloy (marked with * in Table 2) is out of the range of the present invention. .

Next, a tensile test was performed on each of the resulting ultrafine wires of Cu alloy at a predetermined temperature in the range of 400 to 600 ° C. to measure tensile strength and elongation. The rate was measured. Further, a repeated bending test was performed for the purpose of evaluating the repeated bending property.
In the repeated bending test, the upper end of the above-mentioned Cu alloy ultrafine wire had a corner angle of 90 ° and a corner radius of 0.2 mm.
Each jig is sandwiched between the corners, and 10
In a state where the jig is hung with a weight of 0 g, the jig is alternately rotated by 90 ° to the left and right sides centering on the corner portion, and the bending to return to the original position is performed once, and this is repeated. The number of times of bending until the Cu alloy ultrafine wire was broken was measured. Tables 1 and 2 show these measurement results.
It was shown to.

[0013]

According to the results shown in Tables 1 and 2, the present invention C
The u-alloy ultrafine wires 1 to 10 have excellent elongation after sufficiently providing a Cu alloy ultrafine wire having a tensile strength required for practical use of 400 N / mm ² or more and a conductivity of 50% IACS or more. It is clear that it has wire workability and repetitive bendability. On the other hand, as can be seen from the comparative Cu alloy ultrafine wires 1 to 6, even if the content of any one of the constituent components in the Cu alloy constituting this is too high. It is clear that out of the scope of the invention, at least one of the above properties will be inferior.

As described above, the Cu alloy ultrafine wire of the present invention has sufficient strength and conductivity to be put to practical use and has excellent wire drawing workability.
The wire can be drawn to an ultra-fine wire with a diameter of 0.1 mm or less because it can be drawn with almost no break and has excellent repetitive bendability. However, it has industrially useful characteristics such that disconnection does not occur during wiring or operation of equipment.

Continuing on the front page (72) Inventor Kazushi Yatsushiro 1-6-2 Ginza, Chuo-ku, Tokyo Inside Mitsubishi Shindo Copper Co., Ltd. (72) Inventor Rensei 128-7 Ogimachi, Aizuwakamatsu-shi, Fukushima Prefecture Mitsubishi Shindo Copper Co., Ltd. Inside Wakamatsu Works (72) Inventor Seiji Kumagai 128-7 Ogimachi, Aizuwakamatsu City, Fukushima Prefecture Mitsubishi Shindoh Copper Co., Ltd. Wakamatsu Works (56) References JP-A-2-22432 (JP, A) JP-A-63-262437 ( JP, A) JP-A-63-243240 (JP, A) JP-B-49-10894 (JP, B1)

Claims (1)

(57) [Claims] 1. In weight%, Mg: 0.1-1%, P: 0.001-0.02
%, And the balance is composed of Cu and inevitable impurities, and the content of oxygen and sulfur as inevitable impurities is oxygen: 8 ppm or less, and sulfur: 8 ppm or less. Straight line excellent in characteristic repetitive bending property: Cu alloy ultrafine wire of 0.1 mm or less.