JP2020093290A - Method of manufacturing wire joined body - Google Patents

Abstract

To provide a method of manufacturing a wire joined body that can tightly join thin-diameter wires together through simple operation requiring no high-level skill without increasing man-hours and a lead time nor letting the wire have a larger diameter after being joined.SOLUTION: A method of manufacturing a wire joined body comprises: letting ends of thin-diameter wires abut on each other to form an abutting part; covering the abutting part with a first pipe formed of a softer material than the wires; performing diameter reduction processing on the whole first pipe; covering the first pipe after the diameter reduction processing with a second pipe formed of a softer material than the first pipe; and then performing diameter reduction processing on the whole second pipe along an outer periphery of the first pipe.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for manufacturing a wire bonded body.

Various types of wires are used in medical treatment tools that are inserted into a body cavity and diagnose and treat tissues in the body cavity, and the wires need to be joined together. In conventional medical treatment tools, wire bonding by brazing is widely used in order to bond wires having a small diameter (for example, an outer diameter of 1 mm or less) to each other with high strength.

However, since brazing is a skill work, the quality becomes unstable. Further, since flux is used in brazing, cleaning and drying after brazing are required, which increases man-hours and lead time. Furthermore, when brazing, there is a concern that the joint may deteriorate due to unwashed flux.

As a method for solving the problem of joining wires with each other by brazing, there has been proposed a technique for joining wires with high strength by using crimping joining without using brazing. For example, Patent Document 1 proposes a method of caulking and fixing a wire using a fixing member that is softer than the wire.

JP, 2001-157661, A

However, in the method proposed in Patent Document 1, since a soft fixing member is used for fixing the wire, the rigidity of the fixing member is small. Therefore, it is necessary to use a fixing member having a large wall thickness, and there is a problem that the outer diameter after joining becomes large.

The present invention has been made in view of the above, and by a simple work that does not require a high degree of skill, a small-diameter wire without increasing man-hours and lead time and without increasing the outer diameter after joining. It is an object of the present invention to provide a method for manufacturing a wire joined body that can firmly join each other.

In order to solve the above-mentioned problems and achieve the object, the method for manufacturing a wire joined body according to the present invention forms a butt portion by abutting the ends of small-diameter wires with each other, and A first pipe made of a soft material is covered on the abutting portion, the entire diameter of the first pipe is reduced, and the reduced diameter of the first pipe is larger than that of the first pipe. Is covered with a second pipe made of a hard material, and the entire diameter of the second pipe is reduced along the outer circumference of the first pipe.

Further, in the method for manufacturing a wire joined body according to the present invention, in the above invention, the diameter reduction processing of the first pipe is shorter than the entire length of the second pipe before the diameter reduction processing. Is performed by extending the entire length of the second pipe more than the entire length of the second pipe before the diameter reduction processing, and the diameter reduction processing of the second pipe is performed by changing the entire length of the second pipe to the first pipe. It is performed by extending the length to a length equal to the total length after the diameter reduction processing.

Further, in the method for manufacturing a wire joined body according to the present invention, in the above invention, the thickness of the second pipe before the diameter reduction processing is larger than the thickness of the first pipe before the diameter reduction processing. ..

According to the method for manufacturing a wire joined body according to the present invention, the butted portion of the wire is covered with the first pipe made of a soft material, and the outer periphery of the first pipe is covered with the second pipe made of a hard material. The wires are fixed by closely contacting each other. This makes it possible to firmly engage the abutting portion of the wire with the first pipe and the second pipe without increasing the outer diameter after joining. Further, according to the method for manufacturing a wire joined body according to the present invention, since the rigidity of the wire fixing portion can be secured, it is possible to join thin wires with high strength. Further, according to the method for manufacturing a wire bonded body according to the present invention, since a skill work such as conventional brazing is unnecessary, a wire bonded body having stable quality is provided without increasing man-hours and lead time. be able to.

FIG. 1 is a flowchart showing a procedure of a method for manufacturing a wire bonded body according to the first embodiment of the present invention. FIG. 2 is a side view for explaining the wire butting step in the method for manufacturing the wire bonded body according to the first embodiment of the present invention. FIG. 3 is a side view including a partial cross section for explaining the first pipe fixing step in the method for manufacturing the wire joined body according to the first embodiment of the present invention. FIG. 4 is a side view including a partial cross section for explaining the first pipe fixing step in the method for manufacturing the wire joined body according to the first embodiment of the present invention. FIG. 5 is a side view including a partial cross section for explaining the first pipe fixing step in the method for manufacturing the wire joined body according to the first embodiment of the present invention. FIG. 6 is a perspective view showing a configuration of a die used in the first pipe fixing step in the method for manufacturing the wire bonded body according to the first embodiment of the present invention. FIG. 7 is a side view including a partial cross section showing a state after the first pipe fixing step in the method for manufacturing the wire joined body according to the first embodiment of the present invention. FIG. 8 is an enlarged view of portion B in FIG. 7. FIG. 9 is a side view including a partial cross section for explaining the second pipe fixing step in the method for manufacturing the wire joined body according to the first embodiment of the present invention. FIG. 10 is a side view including a partial cross section for explaining the second pipe fixing step in the method for manufacturing the wire joined body according to the first embodiment of the present invention. FIG. 11 is a side view including a partial cross section for explaining the second pipe fixing step in the method for manufacturing the wire joined body according to the first embodiment of the present invention. FIG. 12 is a side view including a partial cross section showing a state after the second pipe fixing step in the method for manufacturing the wire joined body according to the first embodiment of the present invention. FIG. 13 is a diagram showing the lengths of the first pipe and the second pipe before and after the diameter reduction process in the method for manufacturing the wire joined body according to the first embodiment of the present invention. FIG. 14 is a side view including a partial cross section for explaining the second pipe fixing step in the method for manufacturing the wire joined body according to the second embodiment of the present invention. FIG. 15 is a side view including a partial cross section for explaining the second pipe fixing step in the method for manufacturing the wire joined body according to the second embodiment of the present invention. FIG. 16 is a side view including a partial cross section for explaining the second pipe fixing step in the method for manufacturing the wire joined body according to the second embodiment of the present invention. FIG. 17 is a side view including a partial cross section showing a state after the second pipe fixing step in the method for manufacturing the wire joined body according to the first embodiment of the present invention.

Hereinafter, a method for manufacturing a wire bonded body according to an embodiment of the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments, and constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same. Moreover, in each drawing referred to below, the same portions are denoted by the same reference numerals. Further, in the side views referred to below, the configuration other than the wire and the die is shown in cross section.

(Embodiment 1)
A method for manufacturing a wire bonded body according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 13. The method for manufacturing a wire bonded body according to the present embodiment is a method for bonding a plurality of wires to each other to manufacture a wire bonded body, and as shown in FIG. The pipe fixing step S2 and the second pipe fixing step S3 are performed in this order.

<Wire butting process S1>
In the wire abutting step S1, as shown in FIG. 2, a small diameter wire 11 and a wire 12 made of stainless steel are prepared, and end portions 11a and 12a of these wires 11 and 12 are abutted to each other, thereby A butt portion as shown in the portion A is formed.

As the wires 11 and 12 used in this step, for example, a stranded wire having an outer diameter of 1 mm or less is used in which wires having a wire diameter of 0.3 mm or less are twisted together. Further, as the wires 11 and 12, wires having different strand diameters, twisting methods, and outer diameters are used. The wire diameters and the twisting methods of the wires 11 and 12 are not particularly limited, and for example, a single wire having an outer diameter of 1 mm or less may be used.

<First pipe fixing step S2>
In the first pipe fixing step S2, the abutting portions of the wires 11 and 12 formed in the wire abutting step S1 are covered with a first pipe 13 made of a material softer than the wires 11 and 12, and swaging is performed. By the processing, the entire diameter of the first pipe 13 is reduced, and the inner peripheral surface of the first pipe 13 is engaged with the outer peripheral surfaces of the butted portions of the wires 11 and 12.

In this step, first, as shown in FIG. 3, a first pipe 13 is put on the outer circumference of the abutting portion of the wires 11 and 12. As the first pipe 13, for example, a brass pipe, which is a softer material than the wires 11 and 12, is used. Further, as shown in FIG. 13, the total length L ₁₃ of the first pipe 13 before the diameter reduction processing is set shorter than the total length L _{14 of} the second pipe 14 before the diameter reduction processing.

Subsequently, swaging of the first pipe 13 is performed. Before that, the wire 11 is covered so that the position of the first pipe 13 that covers the abutted portions of the wires 11 and 12 is not displaced during the swaging. , 12 and the first pipe 13 are temporarily fixed.

As a method of temporary fixing, for example, a method of crushing the outer circumference of the first pipe 13 by using a crimping tool and crimping the wire 11 and 12 or an end surface of the first pipe 13 and outer circumferential surfaces of the wires 11 and 12 Examples include a method of fixing with an adhesive. In the present embodiment, a crimping tool is pressed against the outer periphery of the first pipe 13 to form a crimping portion 13a as shown in FIG. 4, and the wires 11 and 12 and the first pipe 13 are temporarily fixed. went.

Subsequently, a swaging device (not shown) is operated to reduce the diameter of the first pipe 13 by swaging as shown in FIG. Here, the swaging process is performed by rotating a pair of molding dies by a rotating mechanism of a swaging device and reciprocatingly inserting the round bar or the pipe material into the molding die, thereby the round bar or the pipe material. It is a cold forging process to reduce the outer diameter of.

As a molding die for swaging, for example, as shown in FIG. 6, a die 21 having a groove 21a for reducing the diameter of the first pipe 13 is used. The diameter of the groove 21a of the die 21 is set to be smaller than the outer diameter of the first pipe 13 and larger than the outer diameters of the wires 11 and 12. Further, as shown in FIG. 5, tapered portions 21b are formed at both ends of the groove portion 21a of the die 21 so that the end portion of the first pipe 13 can be smoothly inserted into the groove portion 21a. The shape of the groove 21a is a long and thin drum shape, and the shape of the end face thereof is semicircular. Further, the die 21 is installed at a position symmetrical with respect to the rotation axis in a swaging device (not shown).

When a swaging device (not shown) is operated, as shown in FIG. 5, the pair of dies 21 rotates along the rotation axis and reciprocates in a direction orthogonal to the rotation axis in a predetermined range in synchronization with each other. In this state, the wires 11 and 12 to which the first pipe 13 is temporarily fixed are inserted along the central axis of the groove 21a of the die 21 to a position where the entire length of the first pipe 13 completely passes through the die 21. . As a result, the diameter of the first pipe 13 is reduced and plastically deformed, and the wires 11 and 12 and the first pipe 13 are fixed as shown in FIG. 7.

Here, since the first pipe 13 is made of a material softer than the wires 11 and 12, as shown in FIG. 8, the inner peripheral surface of the first pipe 13 after the diameter reduction processing is twisted. The wires 11 and 12 made of wire wires are plastically deformed in accordance with the shape of each wire, and are closely contacted and engaged with the outer peripheral surfaces of the wires 11 and 12 and fixed. The outer diameter of the first pipe 13 after the diameter reduction processing is substantially the same as the diameter of the groove portion 21a of the die 21 described above.

In this way, by reducing the diameter of the first pipe 13 by swaging, as shown in FIG. 13, the total length L _{13 of} the first pipe 13 is equal to that before the diameter reduction of the second pipe 14. It extends to a full length L _13b longer than the full length L ₁₄ .

<Second pipe fixing step S3>
In the second pipe fixing step S3, the first pipe 13 whose diameter has been reduced in the first pipe fixing step S2 is covered with the second pipe 14 made of a material harder than the first pipe 13. By swaging, the entire diameter of the second pipe 14 is reduced along the outer circumference of the first pipe 13, and the inner peripheral surface of the second pipe 14 is engaged with the outer peripheral surface of the first pipe 13. Let

In this step, first, as shown in FIG. 9, the outer circumference of the first pipe 13 is covered with the second pipe 14. As the second pipe 14, for example, a stainless steel pipe which is a harder material than the first pipe 13 is used. The inner diameter of the second pipe 14 is larger than the diameter of the groove portion 21a of the die 21 when the first pipe 13 is reduced in diameter. Further, as shown in FIG. 13, the total length L ₁₄ of the second pipe 14 before the diameter reduction processing is longer than the total length L _{13 of} the first pipe 13 before the diameter reduction processing, and It is set shorter than the total length L _13b after the diameter reduction processing.

Subsequently, swaging of the second pipe 14 is performed. Before that, the first pipe 13 is covered so that the position of the second pipe 14 covered with the first pipe 13 is not displaced during the swaging. 13 and the second pipe 14 are temporarily fixed. In this step, as in the first pipe fixing step S2, a crimping tool is pressed against the outer circumference of the second pipe 14 to form a crimping portion 14a as shown in FIG. Temporary fixing with the second pipe 14 is performed.

Then, a swaging device (not shown) is operated to reduce the diameter of the second pipe 14 by swaging as shown in FIG. The swaging process in this step is performed by the same method as in the first pipe fixing step S2.

As a molding die for swaging, for example, as shown in FIG. 11, a die 22 having a groove portion 22a for reducing the diameter of the second pipe 14 and a taper portion 22b is used. The diameter of the groove portion 22a of the die 22 is set to be smaller than the outer diameter of the second pipe 14 and larger than the outer diameter of the wires 11 and 12.

When a swaging device (not shown) is operated, as shown in FIG. 11, a pair of dies 22 rotates along a rotation axis and reciprocates in a direction orthogonal to the rotation axis in a predetermined range in synchronization with each other. In this state, the wires 11 and 12 to which the second pipe 14 is temporarily fixed are inserted along the central axis of the groove 22a of the die 22 to a position where the entire length of the second pipe 14 completely passes through the die 22. .. As a result, the diameter of the second pipe 14 is reduced and plastically deformed, and the first pipe 13 and the second pipe 14 are fixed as shown in FIG.

Here, since the second pipe 14 is made of a material harder than the first pipe 13, the second pipe 14 is plastically deformed while pressing the outer peripheral surface of the first pipe 13, It adheres to the outer peripheral surface and is fixed. The outer diameter of the second pipe 14 after the diameter reduction processing is substantially the same as the diameter of the groove portion 22a of the die 22 described above.

Further, by reducing the diameter of the second pipe 14 by swaging, as shown in FIG. 13, the total length L ₁₄ of the second pipe ₁₄ becomes the total length L ₁₄ of the first pipe 13 after the diameter reduction processing. It extends to a full length L _14b equivalent to _13b . It should be noted that the above-mentioned "total length equivalent to the total length L _{13b of} the first pipe 13 after the diameter reduction processing" means not only the same total length L _13b after the diameter reduction processing of the first pipe 13 but also the The total length L _13b after the diameter reduction processing of the first pipe 13 is also included.

Here, when the pipe is swaged, the soft material is more likely to be elongated in its entire length than the hard material. In the present embodiment, as shown in FIG. 13, before the diameter reduction processing of the second pipe 14 made of a hard material is more than the total length L _{13 of} the first pipe 13 made of the soft material before diameter reduction processing. by setting the total length L ₁₄ long, it can be a full length L _13b after diameter reduction of the first pipe 13, substantially equal to the total length L _14b after diameter reduction of the second pipe 14. As a result, the entire first pipe 13 can be covered with the second pipe 14.

Incidentally, as described above, and the total length L _13b after diameter reduction of the first pipe 13, to substantially equal to the total length L _14b after diameter reduction of the second pipe 14, more specifically, The elongations of the first pipe 13 and the second pipe 14 may be measured in advance, and the following (1) to (3) may be appropriately adjusted according to the measurement results.
(1) a first diameter reduction previous total length _{L 13} and wall thickness (2) of the pipe 13 the groove 21a of the second diameter reduction previous total length _{L 14} and wall thickness (3) of the pipe 14 die 21, 22 , 22a diameter

Through the above steps, as shown in FIG. 12, the wire bonded body 1 including the wires 11 and 12 is manufactured. In the wire bonded body 1, the ends 11a and 12a of the wires 11 and 12 are fixed by wire fixing portions. The wire fixing portion includes a first pipe 13 made of a softer material than the wires 11 and 12, and a second pipe 14 made of a harder material than the first pipe 13 provided on the outer periphery thereof. It is composed by.

According to the method for manufacturing the wire joined body according to the first embodiment as described above, the butted portions of the wires 11, 12 are covered with the first pipe 13 made of a soft material, and the first pipe 13 The wires 11, 12 are fixed to each other by closely adhering the second pipe 14 made of a hard material to the outer circumference. As a result, the abutting portions of the wires 11 and 12 can be firmly engaged with the first pipe 13 and the second pipe 14 without increasing the outer diameter after joining.

Further, according to the method for manufacturing the wire joined body according to the first embodiment, since the rigidity of the wire fixing portion can be secured by the second pipe 14 made of a hard material, a force is exerted on the wires 11 and 12. Even when applied, deformation of the wire fixing portion is prevented, and the wires 11 and 12 having a small diameter can be bonded to each other with high strength without the wires 11 and 12 coming off from the wire fixing portion. Further, according to the method for manufacturing the wire bonded body according to the first embodiment, since the skill work such as the conventional brazing is not required, the wire bonded body having stable quality can be obtained without increasing man-hours and lead time. Can be provided.

Further, according to the method for manufacturing the wire bonded body according to the first embodiment, the total length L ₁₄ of the second pipe 14 made of the hard material before the diameter reduction processing is made equal to the first pipe 13 made of the soft material. By making the total length L ₁₃ before the diameter reduction processing longer than that, the entire first pipe 13 can be covered with the second pipe 14 by the diameter reduction processing. Therefore, a large bonding strength can be secured over the entire length of the wire fixing portion.

(Embodiment 2)
A method for manufacturing a wire bonded body according to the second embodiment of the present invention will be described with reference to FIGS. 14 to 17. In the method for manufacturing the wire joined body according to the present embodiment, the wire butting step S1, the first pipe fixing step S2, and the second pipe fixing step S3 are performed as in the first embodiment. Perform in order (see FIG. 1). Here, the wire butting step S1 and the first pipe fixing step S2 of the method for manufacturing the wire assembly according to the present embodiment are the same as those in the above-described first embodiment, and therefore description thereof will be omitted.

<Second pipe fixing step S3>
In the second pipe fixing step S3, the first pipe 13 whose diameter has been reduced in the first pipe fixing step S2 is covered with the second pipe 15 made of a material harder than the first pipe 13. By swaging, the entire diameter of the second pipe 15 is reduced along the outer circumference of the first pipe 13, and the inner peripheral surface of the second pipe 15 is engaged with the outer peripheral surface of the first pipe 13. Let

In this step, first, as shown in FIG. 14, the outer circumference of the first pipe 13 is covered with the second pipe 15. As the second pipe 15, for example, a stainless steel pipe that is a harder material than the first pipe 13 is used. The inner diameter of the second pipe 15 is larger than the diameter of the groove portion 21a of the die 21 when the first pipe 13 is reduced in diameter. Further, the total length of the second pipe 15 before the diameter reduction processing is set to be shorter than the total length of the first pipe 13 after the diameter reduction processing. Further, the wall thickness of the second pipe 15 before the diameter reduction processing is set to be larger than the wall thickness of the first pipe 13 before the diameter reduction processing.

Subsequently, swaging of the second pipe 15 is performed. Before that, the first pipe 13 is covered so that the position of the second pipe 15 covered with the first pipe 13 is not displaced during the swaging. 13 and the second pipe 15 are temporarily fixed. In this step, similar to the first pipe fixing step S2, a crimping tool is pressed against the outer circumference of the second pipe 15 to form a crimping portion 15a as shown in FIG. Temporary fixing with the second pipe 15 is performed.

Subsequently, a swaging device (not shown) is operated, and as shown in FIG. 16, the second pipe 15 is reduced in diameter by swaging. The swaging process in this step is performed by the same method as in the first pipe fixing step S2.

A die 23 having a groove 23a for reducing the diameter of the second pipe 15 and a taper portion 23b is used as a molding die for swaging, as shown in FIG. 16, for example. The diameter of the groove 23a of the die 23 is set to be smaller than the outer diameter of the second pipe 15 and larger than the outer diameters of the wires 11 and 12.

When a swaging device (not shown) is operated, as shown in FIG. 16, a pair of dies 23 rotates along a rotation axis and reciprocates in a direction orthogonal to the rotation axis in a predetermined range in synchronization with each other. In this state, the wires 11 and 12 to which the second pipe 15 is temporarily fixed are inserted along the central axis of the groove 23a of the die 23 to a position where the entire length of the second pipe 15 completely passes through the die 23. .. As a result, the diameter of the second pipe 15 is reduced and plastically deformed, and the first pipe 13 and the second pipe 15 are fixed as shown in FIG.

Here, since the second pipe 15 is made of a harder material than the first pipe 13, the second pipe 15 is plastically deformed while pressing the outer peripheral surface of the first pipe 13, It adheres to the outer peripheral surface and is fixed. The outer diameter of the second pipe 15 after the diameter reduction processing is substantially the same as the diameter of the groove portion 23a of the die 23 described above.

Further, by reducing the diameter of the second pipe 15 by swaging, the total length of the second pipe 15 extends to the same length as the overall length of the first pipe 13 after the diameter reduction processing. In addition, the above-mentioned “total length equivalent to the total length of the first pipe 13 after the diameter reduction processing” is not limited to the same length as the total length of the first pipe 13 after the diameter reduction processing, It also includes the total length that is similar to the total length after the diameter reduction processing of.

Here, when the pipe is swaged, the soft material is more likely to be elongated in its entire length than the hard material. In addition, since the volume of the pipe does not change before and after the diameter reduction processing, the larger the wall thickness of the pipe, the more easily the entire length is extended. In the present embodiment, the wall thickness of the second pipe 15 made of a hard material before the diameter reduction processing is set to be larger than the wall thickness of the first pipe 13 made of a soft material before the diameter reduction processing. Thereby, the total length of the first pipe 13 after the diameter reduction processing and the total length of the second pipe 15 after the diameter reduction processing can be made substantially equal. As a result, the entire first pipe 13 can be covered with the second pipe 15.

Further, by increasing the wall thickness of the second pipe 15 after the diameter reduction processing to be larger than the wall thickness of the first pipe 13 after the diameter reduction processing, and increasing the rigidity of the pipe for fixing the wires 11 and 12, The bonding strength of the wire fixing portion is further improved.

Through the above steps, as shown in FIG. 17, the wire bonded body 1A including the wires 11 and 12 is manufactured. In the wire bonded body 1A, the ends 11a and 12a of the wires 11 and 12 are fixed by wire fixing portions. The wire fixing portion includes a first pipe 13 made of a softer material than the wires 11 and 12, and a second pipe 15 made of a harder material than the first pipe 13 provided on the outer periphery thereof. It is composed by.

According to the method for manufacturing a wire joined body according to the second embodiment as described above, the butted portions of the wires 11, 12 are covered with the first pipe 13 made of a soft material, and the first pipe 13 is covered. The wires 11 and 12 are fixed to each other by closely adhering the second pipe 15 made of a hard material to the outer circumference. As a result, the abutting portions of the wires 11 and 12 can be firmly engaged with the first pipe 13 and the second pipe 15 without increasing the outer diameter after joining.

Further, according to the method for manufacturing the wire joined body according to the second embodiment, since the rigidity of the wire fixing portion can be secured by the second pipe 15 made of a hard material, a force is exerted on the wires 11 and 12. Even when applied, deformation of the wire fixing portion is prevented, and the wires 11 and 12 having a small diameter can be bonded to each other with high strength without the wires 11 and 12 coming off from the wire fixing portion. Further, according to the method for manufacturing the wire bonded body according to the second embodiment, since the skill work such as the conventional brazing is not required, the wire bonded body having stable quality can be obtained without increasing man-hours and lead time. Can be provided.

Further, according to the method for manufacturing a wire joined body according to the second embodiment, the thickness of the second pipe 15 made of a hard material before the diameter reduction processing is made equal to that of the first pipe 13 made of a soft material. By making the wall thickness larger than that before the diameter reduction processing, the entire first pipe 13 can be covered with the second pipe 15 by the diameter reduction processing. Therefore, a large bonding strength can be secured over the entire length of the wire fixing portion.

The method for manufacturing the wire bonded body according to the present invention has been specifically described above with reference to the mode for carrying out the invention, but the gist of the present invention is not limited to these descriptions, and the scope of the claims is not limited. It should be broadly construed based on the statement. It goes without saying that various changes and modifications based on these descriptions are also included in the spirit of the present invention.

1,1A Wire bonded body 11,12 Wire 11a, 12a End part 13 First pipe 13a Crimping part 14,15 Second pipe 14a,15a Crimping part 21,22,23 Die 21a,22a,23a Groove part 21b,22b , 23b Tapered part

Claims (3)

A butt portion is formed by abutting the ends of thin wires with each other.
A first pipe made of a material softer than the wire is covered on the butt portion, and the entire diameter of the first pipe is reduced.
The first pipe that has been subjected to the diameter reduction processing is covered with a second pipe made of a material harder than the first pipe, and the entire second pipe along the outer circumference of the first pipe. To reduce the diameter,
A method for manufacturing a wire bonded body. The diameter reduction processing of the first pipe is shorter than the total length of the second pipe before the diameter reduction processing, and the total length of the first pipe is smaller than the total length of the second pipe before the diameter reduction processing. Done by stretching,
Reducing the diameter of the second pipe is performed by extending the entire length of the second pipe to a length equivalent to the total length of the first pipe after the reducing treatment,
The method for manufacturing the wire bonded body according to claim 1. The second pipe, the wall thickness before the diameter reduction processing is larger than the wall thickness before the diameter reduction processing of the first pipe,
The method for manufacturing the wire bonded body according to claim 1.

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