JPH03230415A - Copper alloy wire rod - Google Patents

Abstract

PURPOSE:To prevent disconnection or bending in a winding process by providing an element wire which includes a preset amount of Ag, and which is processed at a preset draft, with a preset mechanical property through a semi-softening process. CONSTITUTION:Ag is included in an element wire by no less than 0.01weight%. It is not desirable in terms of cost to add Ag which is expensive more than necessary. The element wire undergoes a process such as wire drawing by no less than 40%, and then it receives a semi-softening process so as to obtain a break strength of no less than 30kgf/mm<2> as well as the stretch of no less than 5%. When the break strength is less than 30kgf/mm<2>, the strength is too low, and a desired bending-resistance in a winding process cannot be obtained and disconnection is easy to occur. When the elongation is less than 5%, the wound wire rod in a coil form is curled, and a so-called spring back is easy to occur, which makes the winding difficult. Mechanical property such as bending-resistance and break strength as well as elongation can be improved thereby without sacrificing conductivity.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a copper alloy wire suitable as an ultrafine wire used as a winding core wire for a magnetic head, etc., and in particular has excellent conductivity and heat resistance. , excellent mechanical properties during winding,
The present invention relates to a copper alloy wire suitable for use as an ultrafine wire with a wire diameter of 0.1 mm or less.

[Prior Art] Recently, with the development of electronic equipment, in the field of copper fine wire and winding core wire for magnetic heads (core wire for magnet wire), ultra-fine copper wire with a wire diameter of 0.1 m or less, Especially 50μ
Demand for ultra-fine copper wires of less than 100 ft (m) in diameter is rapidly increasing.

By the way, as copper wires become thinner, wire breakage becomes more likely to occur during winding, and the ends of the copper wires become more likely to bend.

For example, when winding a wire around a ferrite core portion of a magnetic head, if the end of a very thin copper wire is bent, it becomes difficult to pass the wire through the window portion.

If such a situation occurs, it can be dealt with flexibly when the wire is being wound by hand. However, in recent years, the introduction of automatic wire winding processes using robots has been promoted for the purpose of saving labor, and in this automatic winding process, the occurrence of such wire breaks or bends inevitably reduces productivity. For this reason, there is a demand for increased breaking strength and elongation, as well as improved bending resistance and electrical conductivity, in ultrafine copper wires used for magnetic head winding core wires and the like. However, in order to increase the breaking strength,
When ultra-fine copper wire is drawn at a high degree of processing, the desired elongation cannot be obtained and the conductivity deteriorates. On the other hand, when ultrafine copper wire is completely softened by annealing in order to increase its elongation, there is a problem in that the desired breaking strength and bending resistance cannot be obtained.

Therefore, conventionally, in order to obtain the desired breaking strength, elongation, bending resistance, and conductivity, pure copper fine wire material after wire drawing is annealed to semi-soften it and used as winding core wire for magnetic heads. I am using it.

[Problems to be Solved by the Invention] However, since the above-mentioned pure copper fine wire has a low softening temperature, the wire changes from a semi-softened state to a completely softened state when enamel is baked on the peripheral surface of the wire in a later process. It ends up. Therefore, it is not possible to obtain the desired breaking strength, elongation and bending resistance, so there is a problem that wire breakage or bending cannot be prevented during the winding process.

The present invention has been made in view of such problems, and includes:
It is an object of the present invention to provide a copper alloy wire that can improve bending resistance without deteriorating conductivity and can prevent wire breakage or bending during winding.

[Means for Solving the Problems] The copper alloy wire according to the present invention contains 0.01% by weight or more of Ag.
, with the balance consisting of Cu and unavoidable impurities, and a wire with a working degree of 40% or more is subjected to semi-softening treatment with a breaking strength of 30 kg f / ++ m 2 or more and an elongation of 5% or more. It is characterized by being configured with

[Function] In the present invention, a wire material made of an Ag-containing copper alloy is used. This Ag-containing copper alloy has a higher softening temperature than pure copper, and its conductivity hardly deteriorates compared to pure copper. (Metal Data Book revised 2nd edition; edited by the Japan Institute of Metals; 1st GO, 1G page) Therefore, the inventors of the present application fabricated wires made of various Ag-containing steel alloys with different contents, and After drawing the wire to an ultra-fine wire with a wire diameter of 50 μm or less, we conducted repeated experiments to investigate the mechanical properties of the wire by subjecting it to various softening treatments. The present invention was completed based on the experimental results.

That is, in the present invention, the wire contains 0.01% by weight or more of Ag. This strand is subjected to 40% or more processing (wire drawing, etc.), and then 30kg f
/W Perform semi-softening treatment to obtain a breaking strength of 2 or more and an elongation of 5% or more. The copper alloy wire rod obtained in this way has a breaking strength higher than necessary and an appropriate elongation, and the mechanical properties such as breaking strength and elongation are determined by the enamel baking process in the subsequent process. It never deteriorates below the desired value.

Therefore, wire breakage does not occur during the winding process, and
Since the wire has excellent bending resistance, the end of the steel alloy wire does not bend when the wire is passed through the window portion in the process of winding the wire around the ferrite core portion of the magnetic head, for example.

Therefore, according to the present invention, it is possible to improve mechanical properties such as bending resistance, breaking strength, and elongation without deteriorating conductivity, thereby preventing disconnection or bending of the copper alloy wire during the winding process. can do.

Next, the reason for limiting the amount of Ag content in the wire and the degree of processing will be explained.

L111 If the Ag content is less than 0.01% by weight, the amount of Ag is insufficient and the softening temperature (recrystallization temperature) cannot be raised sufficiently, so the copper alloy wire tends to be completely softened in the enamel baking process, etc. Become. For this reason, the Ag content of the wire was reduced to 0. The weight should be O1 or more. However, since this Ag is expensive, it is not preferable to include more than necessary in terms of manufacturing costs.

1 degree - If the degree of processing of the strands by wire drawing or the like is less than 40%, the desired breaking strength of the copper alloy wire after manufacture cannot be obtained.

Therefore, the degree of processing by wire drawing is set to 40% or more.

Next, the reasons for limiting the necessary breaking strength and elongation in the semi-softening treatment will be explained.

When the breaking strength of the copper alloy wire is less than 30 kgf/■I12, the strength is low, and desired bending resistance cannot be obtained in the winding process, and wire breakage is likely to occur. On the other hand, if the elongation of the copper alloy wire is less than 5%, the wound coiled wire tends to warp and cause so-called springback, making winding difficult. Therefore, the breaking strength is 30k
It is necessary to perform a semi-softening treatment that provides mechanical properties of g f / mm 2 or more and elongation of 5% or more.

[Example] Next, an example of the present invention will be described in comparison with a comparative example.

First, 0.01% by weight of Ag is included, and the wire diameter is IGmm.
The wire diameter is 2. Eimm wire was obtained. Next, this strand was completely softened by annealing it in a furnace in an inert gas atmosphere, and then wire-drawn at a processing rate of 99.9% or more to obtain an ultra-fine wire with a wire diameter of 40 μm. . After that, this ultra-fine wire is annealed at a temperature of 400°C in a running annealing furnace in an inert gas atmosphere to a semi-softened state, with a breaking strength of 38 kgf/mm and an elongation of 5%. An Ag-containing copper alloy ultrafine wire was manufactured.

Actual J1 Masu 2 - Same as Example 1 except that the linear velocity was lowered and the residence time in the running annealing furnace, that is, the annealing time was longer than in Example 1, and the breaking strength was 30 kg f / mm. Growth is 22%
An Ag-copper alloy ultrafine wire with a mechanical strength of

Straight Beard 1 First, a copper alloy rod containing 0.1% by weight of Ag and having a wire diameter of 6 mm was wire-drawn to obtain a wire having a wire diameter of 2.6 mm. Next, this strand is completely softened by annealing it in a furnace with an inert gas atmosphere, and then drawn to a wire diameter of 5.
It was set to 2 μm. Furthermore, after completely softening this wire by annealing it in a running annealing furnace in an inert gas atmosphere,
The wire was drawn at a processing rate of 40.8% to obtain an ultra-fine wire with a wire diameter of 408 m. Thereafter, this ultra-fine wire is annealed at a temperature of 300°C in a running annealing furnace in an inert gas atmosphere to a semi-softened state with a breaking strength of 32 kg f/mm.
An Ag-containing copper alloy ultrafine wire having a mechanical strength of 14% at 1 elongation was produced.

Ratio "starvation" - Same as Example 1 except that the linear velocity in the running annealing furnace was lowered and the residence time was longer than in Example 2. Breaking strength was 24 kg f / mu 2 and elongation was 42. An Ag-containing copper alloy ultrafine wire with a mechanical strength of

No. 1 Takumi 1 Example 1 except that the temperature in the running annealing furnace was 300°C, the linear velocity was slowed, and the residence time was shorter than in Example 1.
In the same manner as above, an Ag-containing copper alloy ultrafine wire having a mechanical strength of 41 kg f/mm2 in breaking strength and 2.5% in elongation was produced.

A 99.99% by weight (4 nines) oxygen-free copper rod (wire diameter 16 mm) was used as the starting material, and the temperature in the annealing furnace during running was set to 3.
Except that the temperature was 00°C, the complete softening treatment and processing rate were the same as in Example 1, and the breaking strength was 33 kgf/mm.
An ultrafine copper wire having a mechanical strength of 10% at 1 elongation was produced.

11 cases.

A copper alloy rod (wire diameter ILm) impregnated with O,005% by weight of Ag was used as the starting material, and the temperature in the running annealing furnace was set to 3.
Except for setting the temperature to 00'C, the complete softening treatment and processing rate were the same as in Example 1, and the breaking strength was 37 kgf/m+.
An Ag-containing steel alloy ultrafine wire having a mechanical strength of n2 and an elongation of 7% was manufactured.

L 艷肚i The same copper alloy rod as in Example 3 was wire-drawn to have a wire diameter of 2.
．． A wire of 6 mm was obtained, and the wire was annealed in a furnace under an inert gas atmosphere to completely soften it, and then drawn to a wire diameter of 43 μm. Furthermore, this wire material was completely softened by annealing it in a running annealing furnace in an inert gas atmosphere, and then wire-drawn at a processing rate of 13°5%.
The wire diameter is 40μm and the breaking strength is 27kgf/
In 2, an Ag-containing copper alloy ultrafine wire with a mechanical strength of 28% elongation was produced.

The conductivity (
%IACS) was measured. Next, we investigated the presence or absence of softening in the copper alloy wires after baking enamel onto their peripheral surfaces, and also investigated the ease of winding by winding them around the ferrite core of the magnetic head. Ta. These results are summarized in Table 1 below.

As is clear from Table 1, the copper alloy ultrafine wires according to Examples 1 to 3 have a conductivity of 99 to 100% lAC3, which is sufficiently high, and does not soften due to baking of the enamel. Winding was easy.

On the other hand, the copper alloy ultrafine wires according to Comparative Examples 1 to 5 also had sufficiently high conductivities of 99 to 101% lAC3. However, the copper alloy ultrafine wires of Comparative Example 1, which had a longer running annealing time than Example 1, and Comparative Example 5, which had a lower workability of 3.5% per month, did not undergo softening due to baking of the enamel. Since sufficient breaking strength was not obtained during the winding process, the bending resistance was poor and winding was difficult.

Table 3 In addition, the copper alloy ultrafine wire according to Comparative Example 2, which had a shorter running annealing time than Example 1, did not undergo softening due to baking of the enamel, but sufficient elongation was obtained in the winding process. Because of this, springback occurred and winding was difficult. Further, a copper ultrafine wire according to Comparative Example 3 which does not contain 8g and a Comparative Example 4 whose Ag content is 0.005% by weight.
The copper alloy ultrafine wire according to the above was softened due to baking of the enamel and its breaking strength was lowered, so it had poor bending resistance and was difficult to wind.

[Effects of the Invention] As explained above, according to the present invention, a wire containing a predetermined amount of Ag and processed at a predetermined degree of processing is semi-softened to impart predetermined mechanical properties. Since the copper alloy wire is constituted by the above-mentioned components, the copper alloy wire can prevent wire breakage or bending during the winding process without reducing conductivity. As a result, the copper alloy wire according to the present invention has excellent electrical conductivity and does not soften even when enamel is baked on its circumferential surface, so it has excellent mechanical properties such as bending resistance, breaking strength, and elongation. There will be no breakage or bending during the wiring process.

Therefore, according to the present invention, a copper alloy wire suitable for use as a winding core wire for a magnetic head or the like having a wire diameter of 0.1 m+u or less can be obtained.

Claims (1)

[Claims] (1) Contains 0.01% by weight or more of Ag, with the balance being Cu
and unavoidable impurities, and the processing degree is 40.
Breaking strength is 30kgf/mm^2 for strands of % or more
A copper alloy wire material characterized in that it is constructed by being subjected to semi-softening treatment with an elongation of 5% or more.