JPH05311283A - Cu alloy extra fine wire excellent in wire drawability and repeated bendability - Google Patents

Abstract

PURPOSE:To improve the wire drawability of an allay and to improve the repeated bendability of a fine wire obtd. from the said Cu alloy by specifying Mg, P, Cu, O and S. CONSTITUTION:The objective Cu alloy extra fine wire is formed of an alloy having a compsn. constituted of, by weight, 0.1 to 1% Mg and 0.001 to 0.02% P, and the balance Cu with limited impurities off <=10ppm O and <=15ppm S. This Cu allay extra fine wire has excellent wire drawability and repeated bendability as well as sufficient strength and electrical conductivity. Then, it can be wire-drawn into an extra fine wire having <=0.1mm diameter. Moreover, the generation of the disconnection of this extra fine wire at the time of its wiring and working is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Cu alloy extra fine wire having a diameter of 0.1 mm or less, which is excellent in wire drawing workability and repetitive bendability.

[0002]

2. Description of the Related Art It is well known that many Cu alloy fine wires have been 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 / electrical devices have been remarkably miniaturized, have high performance, and have multiple functions, and accordingly, the wiring has been densified. It is strongly desired to reduce the diameter of the Cu alloy thin wire used for wiring from the viewpoint of weight reduction, but in the case of the conventional Cu alloy thin wire, this diameter is 0.1 mm.
If you try to make the following ultrafine wire, it does not have good wire drawability, so it is easy to break, and even if you can make an ultrafine wire with a diameter of 0.1 mm or less with a low yield, it will not bend repeatedly. Because it is inferior, it is easy to break during wiring and practical use,
The current situation is that we cannot satisfy the demand for smaller diameters.

[0004]

Therefore, the present inventors have
From the above viewpoints, as a result of research to develop a Cu alloy extra fine wire which has excellent wire drawability and excellent repetitive bendability even when thinned, as a result, the thin wire is expressed in% by weight (hereinafter,% Indicates weight%), Mg: 0.1 to 1%, P: 0.001 to 0.02
%, With the balance being Cu and inevitable impurities, and oxygen (O ₂ ) as inevitable impurities.
And a sulfur (S) content of O ₂ : 10 ppm or less and S: 15 ppm or less, the resulting thin wire has sufficient strength and conductivity for practical use. Since it has excellent wire drawing workability, it can be made into an ultrafine wire with a diameter of 0.1 mm or less while the occurrence of wire breakage is significantly suppressed. Even if it is made into a metal, it has excellent repetitive bendability, so that it is possible to prevent disconnection during wiring and practical use, and to obtain high reliability.

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

(B) The P component has the function of forming an intermetallic compound that is finely precipitated in the matrix by combining with Mg, and thereby further improves the repetitive bendability, but its content is 0.001%. If the content is less than 0.02%, the desired effect of improving the repetitive bendability cannot be obtained. On the other hand, if the content exceeds 0.02%,
Since the intermetallic compound becomes coarse and breakage easily occurs during wire drawing, its content is 0.00
It was set to 1 to 0.02%.

[0007] O ₂ and S component as (c) O ₂ and S inevitable impurities, there is a large property affecting wire drawing workability, in the O ₂ 1
With 0 ppm and S, the limit is 15 ppm, and if both are less than this, wire drawing workability improves dramatically, and the diameter:
Since it becomes possible to perform drawing work on ultrafine wires of 0.1 mm or less without causing breakage, the O ₂ content is set to 1
It was set to 0 ppm or less and the S content to 15 ppm or less.

[0008]

EXAMPLES Next, the Cu alloy ultrafine wire of the present invention will be described in detail with reference to Examples. While charging oxygen-free copper into the high-frequency melting furnace and maintaining the inside of the furnace in a vacuum atmosphere of 10 ^-3 torr,
In order to dissolve this and reduce the O ₂ and S in the molten metal by the molten metal induction stirring by a high frequency and the vacuum atmosphere, this state is maintained for a predetermined time within the range of 30 to 90 minutes, and the O in the molten metal is kept.
₂ and S content was adjusted to a predetermined content, and then a predetermined amount of Cu-50Mg alloy and Cu-15% P alloy were added thereto to obtain Cu having the component composition shown in Tables 1 and 2, respectively. After adjusting the molten alloy, cast it in a cold water mold to make a casting soul with dimensions of diameter: 80 mm × length: 200 mm, and ingots with a thickness of 5 mm. , Hot-extruded at a predetermined temperature within the range of 750-850 ° C to make a wire with a diameter of 10 mm, pickled, and then cold-drawn to obtain a wire with a diameter of 25 mm. After annealing at a predetermined temperature within the range of 350 to 500 ° C. for 2 hours and pickling, 2 kg of a wire rod was taken out from this, and cold drawing was repeatedly performed on the wire rod. Inventive Cu alloy microwires 1-10 having a diameter of 08 mm and Comparative C The alloy fine wire 1-6 was produced, respectively.

[0009]

[Table 1]

[0010]

[Table 2]

For the purpose of evaluating the wire drawing workability, in the above embodiment, the diameter of the wire rod was changed from 2.5 mm to 0.5 mm.
The number of wire breakages during drawing the 0.08 mm ultrafine wire was measured. Further, in the comparative Cu alloy ultrafine wires 1 to 6, the content of any one of the constituent components in the Cu alloy constituting the same (marked with * in Table 2) is out of the range of the present invention. ..

Next, the various Cu alloy ultrafine wires obtained as a result are subjected to a tensile test in a state of being annealed at a predetermined temperature within the range of 400 to 600 ° C., the tensile strength and the elongation are measured, and the conductivity is further measured. The rate was measured. In addition, a repeated bending test was performed for the purpose of evaluating repeated bendability.
In the repeated bending test, the upper end of the Cu alloy ultrafine wire has a corner angle of 90 ° and a corner radius of 0.2 mm.
Scissors at the corner of each jig, and
With the weight of 0 g attached and suspended, the jig is alternately rotated 90 ° to the left and right sides around the corner, and the bending to return to the original position is one bending, and this is repeated. The number of times of bending until the Cu alloy extra fine wire was broken was measured. These measurement results are shown in Tables 1 and 2.
It was shown to.

[0013]

From the results shown in Tables 1 and 2, the present invention C
u alloy ultrafine wires 1 to 10 have a tensile strength required for practical use of this type of Cu alloy ultrafine wire: 400 N / mm ² or more,
Conductivity: 50% IACS or more is sufficiently provided, and it is clear that it has excellent wire drawability and repetitive bendability. On the other hand, as shown in Comparative Cu alloy extra fine wires 1 to 6, this is If the content of any one of the constituents in the constituent Cu alloy deviates from the scope of the present invention, it is clear that at least one of the above characteristics becomes inferior.

As described above, the Cu alloy extra fine wire of the present invention has sufficient strength and conductivity for practical use, and has excellent wire drawability and repetitive bendability. Wire drawing work for ultra-fine wire of 0.1 mm or less can be performed with almost no breakage, and even when it is put into practical use in the state of ultra-fine wire of diameter: 0.1 mm or less, wiring and equipment It has industrially useful characteristics such as disconnection no longer occurring during operation.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazushi Yatsushiro 1-6-2, Ginza, Chuo-ku, Tokyo Mitsubishi Shin Copper Co., Ltd. Copper Wakamatsu Works (72) Inventor Seiji Kumagai 128-7 Ogimachi, Aizuwakamatsu, Fukushima Prefecture Wakamatsu Works, Mitsubishi Shindoh Co., Ltd.

Claims (1)

[Claims] 1. By weight%, Mg: 0.1 to 1%, P: 0.001 to 0.02
%, With the balance being Cu and unavoidable impurities, and the oxygen and sulfur contents as unavoidable impurities: oxygen: 10 ppm or less, sulfur: 15 ppm or less. Cu alloy extra fine wire with excellent wire drawing workability and repetitive bendability.