JP2923597B2 - Manufacturing method of fine diameter composite metal plated wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a thin composite metal plated wire, and more particularly, to a method for manufacturing a small composite metal plated wire having an outer diameter of several tens of micrometers. It relates to a manufacturing method.

[0002]

2. Description of the Related Art As a conventional method for producing a thin composite metal plated wire, there is known a method of producing a small composite iron plating wire described in Japanese Patent Application Laid-Open No. 64-17992. FIG. 7 shows a flow chart of a method for manufacturing the above-described conventional small-diameter composite iron-plated wire. In step R1, a copper core material (for example, having an outer diameter of 0.9
mm), an iron plating layer (for example, a thickness of 10 μm) is formed by electroplating to form a composite iron plating wire. In Step R2, the composite iron-plated wire prepared in Step 1 is drawn to obtain a small-diameter composite iron-plated wire having a predetermined outer diameter (for example, 0.025 mm to 0.03 mm). In step R3, a polyurethane film is baked on the small-diameter composite iron-plated wire.

[0003]

In the above-mentioned conventional method for producing a fine-diameter composite iron-plated wire, iron is coated on a copper core material by electroplating. It is formed from a tough electrolytic iron layer. Accordingly, the composite iron-plated wire can be drawn from a base material of 0.9 mm to a thin wire of 0.05 mm by drawing. However, although the iron plating layer by electroplating is tough and excellent in ductility, the degree of work hardening when plastic working is performed is inevitably higher than that of the core copper wire. For this reason, when such a complex iron-plated wire is subjected to a strong working in which the degree of plastic working exceeds 99%, the work hardening of the iron-plated layer increases, and the frequency of disconnection in the wire drawing process increases sharply. Had a big problem. In addition, there is a problem that the curling of the thin wire is easily caused by the hardening of the iron plating layer. Further, there is a quality problem that cracks occur in the iron plating layer due to bending. This problem was the same even when the electroplating layer was a nickel plating layer or an iron-nickel plating layer. Accordingly, an object of the present invention is to provide a method for manufacturing a thin metal composite wire having a reduced diameter, which further reduces the frequency of disconnection in the wire drawing process, does not cause curl, and can prevent the occurrence of cracks due to bending. To provide.

[0004]

SUMMARY OF THE INVENTION In a first aspect, the present invention provides a method of forming a single metal of iron or nickel or an iron-nickel alloy on an outer periphery of a copper or copper alloy core material by electroplating. (1) forming a composite metal plated wire by forming a plating layer, and performing wire drawing until the composite metal plated wire has a predetermined outer diameter to produce a small diameter composite metal plated wire; In the manufacturing method, when the degree of plastic working of the composite metal plated wire is in a range of 95% or more and 99% or less, the composite metal plated wire is subjected to resistance heating and firing.
Provided is a method for manufacturing a fine-diameter composite metal-plated wire, characterized by performing intermediate annealing by annealing.

According to a second aspect, the present invention provides a method for forming a first plating layer made of a single metal of iron or nickel or an iron-nickel alloy on an outer periphery of a copper or copper alloy core material by electroplating, On the outer periphery of the first plating layer, a second plating layer made of a single metal of copper, gold, or silver or an alloy thereof is formed by electroplating to form a composite metal plated wire. In a method for manufacturing a small-diameter composite metal-plated wire in which a thin-diameter composite metal-plated wire is manufactured by performing wire drawing until the plated wire has a predetermined outer diameter, the degree of plastic working of the composite metal-plated wire is 95% or more, %, The composite metal plated wire is subjected to resistance heating annealing.
The present invention provides a method for producing a small-diameter composite metal-plated wire, which is characterized by performing intermediate annealing according to (1).

The degree of plastic working means the degree of plastic working = (1− (r / R) ² ) × where R is the outer diameter before wire drawing and r is the outer diameter after wire drawing. It is a value defined by 100.

[0007]

According to the first aspect of the present invention, in the method for producing a thin composite metal plated wire of the present invention, the wire drawing is performed until the degree of plastic working of the composite metal plated wire is in the range of 95% or more and 99% or less. At this stage, intermediate annealing is performed to eliminate work hardening of the first plating layer made of a single metal of iron or nickel or an iron-nickel alloy. While sandwiching the intermediate annealing one or more times during wire drawing, wire drawing is performed to a predetermined outer diameter to obtain a desired thin composite metal plated wire. As described above, since the work hardening of the first plating layer is eliminated by performing the annealing in the middle of the wire drawing, disconnection in the wire drawing process is reduced,
In addition, curling does not occur, and the occurrence of cracks when the thin wire is bent can be eliminated.

[0008] Unless annealing is performed until the degree of plastic working exceeds 99%, wire breakage tends to occur frequently in wire drawing due to working stress accumulated in the first plating layer, and curling tends to occur. Cracks occur in the first plating layer when bent. On the other hand, performing the annealing at a stage where the degree of plastic working is less than 95% increases the number of working steps of the wire drawing step and the intermediate annealing step, and increases the production facility cost of the thin composite metal plated wire. Also, it is not preferable because the production cost is increased. Therefore, it is necessary to perform the intermediate annealing in the range of the plastic working degree of 95% or more and 99% or less.

In the method for manufacturing a thin metal composite wire according to the second aspect of the present invention, a single metal of copper, gold or silver or an alloy thereof is formed on the outer periphery of the first plating layer. A second plating layer is formed. Since the second plating layer has a lower degree of work hardening than the first plating layer even when wire drawing is performed, it acts as a lubricating layer between the first plating layer and the wire drawing die during thin wire processing. This significantly reduces the wear of the wire drawing die. Since this function is added to the function according to the first aspect, the disconnection trouble in the wire drawing process can be further reduced.

In the first half stage and the second half stage of the wire drawing, since the former linear speed is generally high, the degree of plastic working of the composite metal plated wire is in the range of 95% or more and 99% or less. By performing the wire drawing process up to and the subsequent intermediate annealing process as a continuous process, annealing can be performed at a large linear speed, which is preferable in terms of production efficiency.

In the annealing, in addition to the resistance heating annealing for directly heating the composite metal plated wire using Joule heat, the composite metal plated wire is indirectly passed through a furnace atmosphere at a predetermined temperature. There is also furnace annealing for heating. However, in the furnace annealing, the annealing time is 1 time compared to the resistance heating annealing because of indirect heating.
Since the 0 to 50 times the required number, need to slow down or annealing line speed to increase the furnace length, which is not preferable. Therefore, the present invention
Has realized space saving of production equipment and improvement of production efficiency as resistance heating annealing . Also, the longer the annealing time,
At the interface between copper or copper alloy and nickel or iron-nickel alloy, a copper-nickel diffusion layer is easily generated. Since this copper-nickel diffusion layer is inferior in plastic workability and causes a reduction in coil frequency characteristics when a small-diameter composite metal plated wire is wound around the coil, it is desirable that the copper-nickel diffusion layer be formed as little as possible. For this reason, in the present invention, furnace annealing is not performed with a long annealing time, but resistance heating is performed with a short annealing time.
Annealed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the embodiments shown in the drawings. It should be noted that the present invention is not limited by this.

In this embodiment, a description will be given of a case where one intermediate annealing step is included in the manufacturing process of the small diameter composite metal plated wire. When two intermediate annealing processes are included, the process is repeated when one intermediate annealing process is included, and a description thereof will be omitted. FIG. 1 is a flow chart showing one embodiment of the method for manufacturing a thin composite metal plated wire of the present invention. In step S1, as shown in FIG. 2A, a first plating layer B of iron or nickel or an iron-nickel alloy is formed on the outer periphery of a core material A of copper or copper alloy by electroplating. The composite metal plating wire W1 is created. Alternatively, as shown in FIG. 3A, a second plating layer C made of copper, silver, gold, a copper alloy, a silver alloy, or a gold alloy is formed on the outer periphery of the first plating layer B to form a composite metal. The plating wire W1 is created.

In step 2, the composite metal plated wire W
1 is subjected to wire drawing to a degree of plastic working of 95% or more and 99% or less. In step 3, resistance annealing such as current annealing or induction annealing is performed. In step 4, the composite metal plated wire after the resistance heating annealing is drawn to a predetermined outer diameter. In this case, the degree of plastic working of wire drawing is also 95%.
Of course, it should be within the range of 99% or less. As a result, a thin composite metal plated wire W as shown in FIG. 2B is obtained. Alternatively, FIG.
Thus, a thin composite metal plated wire W as shown in FIG. In step 5, a polyurethane film is applied and baked on the small-diameter composite metal plating wire W.

FIG. 4 is an explanatory view of an apparatus for manufacturing a thin composite metal plated wire which implements the method for manufacturing a thin composite metal plated wire of the present invention. The apparatus 100 for manufacturing a thin composite metal plated wire includes a wire drawing annealing device 101 and a wire drawing device 1 after annealing.
02. Since the process up to the intermediate annealing and the process after the intermediate annealing are separated, it is useful when the drawing speed before the intermediate annealing is different from the drawing speed after the intermediate annealing. The wire drawing annealing apparatus 101 has a wire feeder 1, a wire drawing machine before annealing 2, a current annealing machine 3, and a winding machine 4.
The post-annealing wire drawing device 102 includes a wire feeding machine 5, a wire drawing machine 6 after annealing, and a winding machine 7. The current annealing machine 3 includes:
A first power supply roll 10 connected to the negative electrode of the DC power supply E,
A second power supply roll 11 connected to the positive electrode of the DC power supply E,
A third power supply roll 12 connected to the negative electrode of the DC power source E,
And a cooling water tank 13.

The composite metal plated wire W1 is drawn out of the wire feeder 1 and drawn by the diamond die 9 in the wire drawing machine 2 before annealing to a plastic working degree of 95% or more and 99% or less. The composite metal-plated wire W2 that has passed through the pre-annealing wire drawing machine 2 is separated by the current annealing machine 3 between the first power supply roll 10 and the second power supply roll 11 and the second power supply roll 1
Electric current is supplied between the first and third power supply rolls 12, and annealing is performed by the Joule heat. Then, the water is cooled by the water tank 14. Composite metal plated wire W passed through current annealing machine 3
3 is wound by the winder 4.

The composite metal-plated wire W3 is drawn out from the wire supplying machine 5, is drawn to a predetermined outer diameter by a diamond die 16 in the wire drawing machine 6 after the annealing, and is formed into a small-diameter composite metal-plated wire W. It is wound by the winder 7.

FIG. 5 is an explanatory view of another apparatus for manufacturing a small-diameter composite metal plated wire for implementing the method for manufacturing a small-diameter composite metal plated wire of the present invention. The apparatus 100 'for manufacturing a thin composite metal plated wire is obtained by connecting the wire drawing annealing apparatus 101 and the wire drawing apparatus 102 after annealing in FIG. Since the process up to the intermediate annealing and the process after the intermediate annealing are continuous, it is useful when the drawing speed before the intermediate annealing is the same as the drawing speed after the intermediate annealing.

Production Example 1 An iron plating layer having a thickness of 10 μm was formed by electroplating on the outer periphery of a copper wire having an outer diameter of 0.9 mm, and copper having a thickness of 5 μm was formed on the outer periphery of the iron plating layer by electroplating. A plating layer was formed to prepare a composite metal plating wire. This composite metal-plated wire is drawn to an outer diameter of 0.14 mm (plastic working ratio 97.6%) at a drawing speed of 1400 m / min.
Current annealing was performed at an applied voltage of 35 V, a current of 17 A, and a conduction time of 0.066 seconds. Next, the current-annealed composite metal plated wire was drawn to an outer diameter of 0.05 mm at a drawing speed of 1200 m / min to produce a thin composite metal plated wire. The production amount of the fine-diameter composite metal-plated wire until wire breakage occurred in the wire drawing after annealing was about 20 kg, and the wire breakage frequency was very low. No curling was observed. Further, when this thin composite metal plated wire was bent, no crack was observed in the plated layer. Thereafter, a polyurethane film was applied to the fine-diameter composite metal-plated wire and baked to obtain an enamel fine-diameter composite metal-plated wire. The elongation of the enameled small-diameter composite metal plated wire measured by a tensile tester was 26%. In addition, the enamel fine-diameter composite metal-plated wire was wound tightly in a single layer around an air-core coil, and the Q value measured at a frequency of 10 MHz was 60. For comparison, a small-diameter composite metal plated wire was manufactured under the same conditions as above except that current annealing was not performed (the degree of plastic working was 99.7%). The production amount of the thin composite metal plated wire before the wire breakage occurred in the wire drawing after annealing was about 2 kg, and the wire breakage frequency was about 10 times higher than that in the case where the intermediate annealing was performed. In addition, curling was observed. Furthermore, cracks were observed in the plating layer when the thin wire was bent. The elongation is 22
%Met. The Q value was 60. The results are summarized in FIG. 6 as Production Example 1.

Manufacturing Example 2 An iron plating layer having a thickness of 10 μm is formed on the outer periphery of a copper wire having an outer diameter of 0.9 mm by electroplating, and a copper plating having a thickness of 5 μm is formed on the outer periphery of the iron plating layer by electroplating. A plating layer was formed to prepare a composite metal plating wire. This composite metal-plated wire is drawn to an outer diameter of 0.10 mm (plastic working ratio 98.8%) at a drawing speed of 1400 m / min, and subsequently,
Current annealing was performed at an applied voltage of 36 V, a current of 9 A, and a conduction time of 0.066 seconds. Next, the current-annealed composite metal plated wire was drawn to an outer diameter of 0.05 mm at a drawing speed of 1200 m / min to produce a thin composite metal plated wire. The production amount of the fine-diameter composite metal-plated wire before the wire break occurred in the wire drawing after annealing was about 20 kg, and the wire break frequency was very low. No curling was observed. Further, when this thin composite metal plated wire was bent, no crack was observed in the plating layer.
Thereafter, a polyurethane film was applied to the fine-diameter composite metal-plated wire and baked to obtain an enamel fine-diameter composite metal-plated wire.
The elongation of the enameled small-diameter composite metal-plated wire measured by a tensile tester was 27%. In addition, the enamel fine-diameter composite metal-plated wire was closely wound in a single layer around the air-core coil, and the Q value was measured at a frequency of 10 MHz. The results are summarized in FIG. 6 as Production Example 2.

Manufacturing Example 3 An iron plating layer having a thickness of 10 μm is formed by electroplating on the outer periphery of a copper wire having an outer diameter of 0.9 mm, and copper having a thickness of 5 μm is formed on the outer periphery of the iron plating layer by electroplating. A plating layer was formed to prepare a composite metal plating wire. This composite metal-plated wire is drawn to an outer diameter of 0.14 mm (plastic working ratio 97.6%) at a drawing speed of 1400 m / min.
Current annealing was performed at an applied voltage of 35 V, a current of 17 A, and a conduction time of 0.066 seconds. Next, the current-annealed composite metal plated wire was drawn to an outer diameter of 0.03 mm at a drawing speed of 1200 m / min to produce a thin composite metal plated wire. The production amount of the fine-diameter composite metal-plated wire before the wire breakage occurred in the wire drawing after annealing was about 6 kg, and the wire breakage frequency was very low. No curling was observed. Further, when this thin composite metal plated wire was bent, no crack was observed in the plating layer. Thereafter, a polyurethane film was applied to the fine-diameter composite metal-plated wire and baked to obtain an enamel fine-diameter composite metal-plated wire. The elongation of the enameled thin composite metal plated wire measured by a tensile tester was 18%. In addition, the enamel fine-diameter composite metal-plated wire was wound tightly in a single layer around the air-core coil, and the Q value was measured at a frequency of 10 MHz. The result was 32. For comparison, a thin composite metal plated wire was manufactured under the same conditions as above except that the annealing was not performed (the degree of plastic working was 99.9%). The production amount of the fine-diameter composite metal plated wire before the occurrence of wire breakage in wire drawing after annealing was about 600 g, and the frequency of wire breakage was about 10 times higher than in the case of annealing. In addition, curling was observed. Further, when this thin composite metal plated wire was bent, cracks were observed in the plating layer. Also,
The elongation was 15%. Further, the Q value was 32. The results are summarized in FIG. 6 as Production Example 3.

Manufacturing Example 4 An iron plating layer having a thickness of 10 μm is formed by electroplating on the outer periphery of a copper wire having an outer diameter of 0.9 mm, and copper having a thickness of 5 μm is formed on the outer periphery of the iron plating layer by electroplating. A plating layer was formed to prepare a composite metal plating wire. This composite metal-plated wire is drawn to an outer diameter of 0.10 mm (plastic working ratio 98.8%) at a drawing speed of 1400 m / min, and subsequently,
Current annealing was performed at an applied voltage of 36 V, a current of 9 A, and a conduction time of 0.066 seconds. Next, the current-annealed composite metal plated wire was drawn to an outer diameter of 0.03 mm at a drawing speed of 1200 m / min to produce a thin composite metal plated wire. The production amount of the fine-diameter composite metal-plated wire before the wire breakage occurred in the wire drawing after annealing was about 6 kg, and the wire breakage frequency was very low. No curling was observed. Further, when this thin composite metal plated wire was bent, no crack was observed in the plating layer. Thereafter, a polyurethane film was applied to the fine-diameter composite metal-plated wire and baked to obtain an enamel fine-diameter composite metal-plated wire. The result of measuring the elongation of the enameled thin composite metal plated wire with a tensile tester was 19%. In addition, the enamel fine-diameter composite metal-plated wire was wound tightly in a single layer around the air-core coil, and the Q value was measured at a frequency of 10 MHz. The result was 32. The results are summarized in FIG. 6 as Production Example 4.

Manufacturing Example 5 An iron plating layer having a thickness of 10 μm was formed on the outer periphery of a copper wire having an outer diameter of 0.9 mm by electroplating to prepare a composite metal plated wire. This composite metal plated wire is drawn at a wire drawing speed of 1400 m / min to an outer diameter of 0.2 mm (plastic deformation degree 95%), and subsequently, at an applied voltage of 18 V, a current of 28 A, and an energizing time of 0.066 seconds. Current annealing was performed. Next, the current-annealed composite metal plated wire was drawn to an outer diameter of 0.05 mm at a drawing speed of 1200 m / min to produce a thin composite metal plated wire. The production volume of the fine-diameter composite metal-plated wire before wire breakage occurs in wire drawing after annealing is about 1
0 kg, and the frequency of disconnection was very low. No curling was observed. Further, when this thin composite metal plated wire was bent, no crack was observed in the plating layer. Thereafter, a polyurethane film was applied to the fine-diameter composite metal-plated wire and baked to obtain an enamel fine-diameter composite metal-plated wire. The elongation of the enameled thin composite metal plated wire was measured by a tensile tester and found to be 25%. In addition, the enamel fine-diameter composite metal-plated wire was closely wound in a single layer around the air-core coil, and the Q value was measured at a frequency of 10 MHz. The results are summarized in FIG. 6 as Production Example 5.

[0024]

According to the method for manufacturing a thin composite metal plated wire of the present invention, the degree of plastic working is 95% or more and 99% or less.
% Or less , the intermediate annealing is performed at the stage where the ratio becomes less than or equal to% , so that the frequency of disconnection can be reduced. In addition, curling can be prevented. Further, generation of cracks in the plating layer can be prevented. Therefore, the outer diameter is several tens μm
The thin composite metal plated wire can be efficiently manufactured. Further, since the first plating layer is protected by the second plating layer, the frequency of disconnection can be further reduced, and a thin composite metal plated wire having an outer diameter of several tens of μm can be manufactured more efficiently. Also, since wire drawing and annealing are performed continuously,
The work process can be made more efficient. In addition, since annealing is performed in a short time by resistance heating annealing, production efficiency can be improved, diffusion between dissimilar metals is suppressed, and deterioration of the mechanical, electrical, and magnetic properties of the fine-diameter composite metal plated wire is prevented. become able to.

[Brief description of the drawings]

FIG. 1 is a flow chart of one embodiment of a method for manufacturing a thin composite metal plated wire according to the present invention.

FIG. 2 is a cross-sectional view of a two-layer composite metal plated wire and a small-diameter composite metal plated wire.

FIG. 3 is a cross-sectional view of a three-layer composite metal plated wire and a small-diameter composite metal plated wire.

FIG. 4 is an explanatory view of an apparatus for manufacturing a thin-diameter composite metal-plated wire that implements the method for manufacturing a thin-diameter composite metal-plated wire of the present invention.

FIG. 5 is an explanatory view of another apparatus for manufacturing a small-diameter composite metal-plated wire for implementing the method for manufacturing a small-diameter composite metal-plated wire of the present invention.

FIG. 6 is a characteristic chart showing data of a production example according to the method for producing a thin composite metal plated wire of the present invention.

FIG. 7 is a flowchart of a conventional method for manufacturing a small-diameter composite iron-plated wire.

[Explanation of symbols]

 Reference Signs List 100, 100 'Thin metal composite wire manufacturing apparatus 1 Wire feeder 2 Wire drawing machine before annealing 3 Current annealing machine 6 Wire drawing machine after annealing 10 First power supply roll 11 Second power supply roll 12 Third power supply roll E Power supply W, W 'Small diameter composite metal plated wire A Core material B First plating layer C Second plating layer

Claims (3)

(57) [Claims] A composite metal plated wire is formed by forming a first plating layer made of a single metal of iron or nickel or an iron-nickel alloy by electroplating on the outer periphery of a copper or copper alloy core material. In a method for manufacturing a small-diameter composite metal-plated wire in which the composite metal-plated wire is drawn to a predetermined outer diameter to produce a small-diameter composite metal-plated wire, the degree of plastic working of the composite metal-plated wire is 95% or more, 99
%, Wherein the composite metal plated wire is subjected to intermediate annealing by resistance heating annealing at the stage when the content of the composite metal plated wire falls within the range. 2. A first plating layer made of a single metal of iron or nickel or an iron-nickel alloy is formed on the outer periphery of a copper or copper alloy core material by electroplating, and the outer periphery of the first plating layer is formed. A second plating layer made of a single metal of copper, gold, or silver or an alloy thereof is formed by electroplating to form a composite metal plating wire. In the method for manufacturing a thin metal composite wire in which the thin metal composite wire is manufactured by drawing the wire to a diameter, the degree of plastic working of the composite metal plated wire is in a range of 95% or more and 99% or less. At the stage of the composite metal plated wire,
A method for producing a small-diameter composite metal-plated wire, comprising performing intermediate annealing by resistance heating annealing . 3. The method for producing a thin composite metal plated wire according to claim 1 or 2, wherein the degree of plastic working of the composite metal plated wire is 95% or more and 99% or less. A method for producing a small-diameter composite metal-plated wire, wherein a step and a subsequent intermediate annealing step are continuous steps.