JPH08150488A - Welding method of wire rod and forming jig for welding - Google Patents

Abstract

PURPOSE: To provide a welding method of wire rods and a forming jig for welding, in connection with the irradiation of a high energy beam such as a laser beam, which enable welding in a stable condition on various materials to be welded. CONSTITUTION: In the welding in which a wire rod 8 is irradiated by a high energy beam (laser beam L), a part of the wire rod 8 is rolled to form a planar part 7 and then, irradiated by the laser beam L at the planar part 7 superposed on a material to be welded (such as the planar part 7 of another wire rod 8).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding method for a wire rod and a welding jig for welding a thin wire used for electric wiring by irradiating a high energy beam such as a laser beam.

[0002]

2. Description of the Related Art As a method for irradiating a laser beam to weld a fine wire, for example, the following welding method is proposed in Japanese Patent Laid-Open No. 52-116757. JP-A-52
In the welding method disclosed in Japanese Patent Laid-Open No. 116757, as shown in FIG. 14, when fine lines a and b are crossed and a laser beam c is irradiated from above the fine line b, as shown in FIG.
At the same time that the end portion b ′ of the thin wire b is melted, the melting portion d welds the thin wires a and b.

However, the above-mentioned welding method is good in the case where one end of one thin wire a is fused and welded in a T-shape, but there is a problem that the thin wires cannot be welded in a cross shape. There is. Generally, when welding a thin wire with laser light, etc., the circumference of the wire is surrounded by air that is a heat insulating material and the heat capacity of the wire is small and it is easy to melt, so if you try to increase the melting depth, The phenomenon that the diameter becomes large and the periphery of the irradiation part melts and the wire rod easily melts down occurs.

The above-mentioned proposal attempts to melt the end portion of one thin wire a by utilizing this phenomenon, but even if the thin wires are welded in a cross shape, the wire material melts down. Therefore, the thin wires cannot be welded to each other in a stable state.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and by flattening a part of a fine wire to form a plate-like portion, various materials to be welded can be formed. An object of the present invention is to provide a welding method of a wire rod and a welding forming jig that can perform welding by irradiation with a high energy beam in a stable state.

[0006]

In order to achieve the above object, the welding method of a wire rod according to the present invention is to irradiate a high energy beam to the wire rod to perform welding, and roll a part of the wire rod to plate it. After the plate-shaped portion is formed, the plate-shaped portion is superposed on the material to be welded and the high energy beam is irradiated. It is preferable that the plate-shaped portion is a plate-shaped portion integrally formed with the wire by forming an arcuate curved surface at an end of the plate-shaped portion (claim 2). It is effective that the material to be welded is a terminal fitting that constitutes an electric component (claim 3).

Further, a welding jig for welding a wire according to a fourth aspect of the present invention is a pressing die including a lower die having a plate-shaped recess formed in a holding groove for receiving the wire and a pressing portion having a curved end. It consists of and.

[0008]

According to the present invention, the wire to be welded is preliminarily rolled to form a plate-like portion, and the plate-like portion is superposed on the material to be welded and irradiated with a high energy beam such as a laser beam. I am trying. Since the plate-shaped part is thinner than the diameter of the wire rod, it is possible to weld by reducing the diameter of the melted part by irradiation of the high energy beam, and the melted part melts down and the wire rod is melted. And stable welding can be performed.

Further, since the portion which is irradiated with the high energy beam such as laser light is plate-shaped, the energy absorption efficiency is improved. That is, as shown in FIG. 13, with a material m having a circular cross section such as a general wire rod, when the laser light L is irradiated, reflection is increased at a portion where the incident angle is small, and the laser light absorption efficiency is reduced. By forming the plate-shaped portion according to the present invention, the absorption efficiency of laser light is improved, and welding can be performed smoothly.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the welding method of the present invention, first, in order to form a plate-like portion on a wire to be welded, the wire is rolled using a forming jig A as shown in FIG. Forming jig A is
It comprises a lower die 1 on which the wire to be welded is placed, and a pressing die 2 which applies a pressing force to the wire. The lower mold 1 is shown in FIGS.
As shown in FIG. 3, a holding groove 3 that matches the diameter of the wire is provided in the longitudinal direction, and a wide plate-shaped recess 4 is formed in the substantial center of the holding groove 3.
Are formed.

The pressing die 2 is formed in a punch shape corresponding to the lower die 1, has a pressing portion 5 which is fitted into the plate-shaped recess 4 at the tip portion, and curved surfaces 6 are formed at both ends in the longitudinal direction. ing. The wire rod to be welded is placed in the holding groove 3 of the lower die 1 and the die 2 is pressed.
When pressed by, the wire is rolled into the plate-shaped recess 4 and flattened, and a wire 8 having a plate-shaped portion 7 is formed as shown in FIGS. 4 and 5. An arcuate curved surface 7a is formed at the end of the plate-shaped portion 7 and is integrally joined to the wire rod 8. The mechanism for pressing the pressing die 2 is not particularly limited, but it is preferable to mount the pressing die 2 on a pressing mechanism (not shown) provided so as to be able to move up and down.

When the wire rods are welded to each other, as shown in FIG. 6, the plate-shaped portion 7 processed by using the forming jig A is used.
The wire rods 8, 8 are superposed on each other at the plate-like portion 7, and the superposed portions are irradiated with a high energy beam L such as a laser beam and welded.

At this time, as shown in FIG. 7, it is necessary to make the diameter t of the welded portion 9 during welding smaller than the width w of the plate portion 7. If the diameter t of the welded portion 9 is made larger than the width w of the plate-shaped portion 7, as shown in FIG. 8, a notch-shaped constriction 10 is generated in the welded portion 9 and the strength of the wire is reduced. It is advisable to adjust so that the waist 10 does not occur.

As shown in FIG. 9, wire rods 8 and 8'to be welded.
When the diameters of and are different from each other, it is preferable to provide the plate-like portion 7 of the thin wire rod 8 with a longer length and disperse the welded portions 9 in two places for welding. Further, as shown in FIG. 10, when welding the end portions of the wire rod 8 to each other, the plate-shaped portions 7 may be formed at the end portions of the wire rod 8 and they may be overlapped and welded. 9 is a welded portion. FIG. 11 shows a case where the wire rods 8 are welded to each other in a T shape.

FIG. 12 relates to another embodiment of the present invention and shows a state in which a plate-like terminal metal fitting 11 constituting an electric component and a wire 8 are welded as a material to be welded. The present invention can be applied to the welding of thin wires to various metal plates and structures other than the above example.

[0016]

According to the present invention, since the plate-like portion formed on the wire to be welded is overlapped with the material to be welded and a high energy beam such as a laser beam is irradiated, it is possible to perform welding. Stable and good welding can be carried out without the melting portion melting down and the wire cutting. Further, by changing the area of the plate-shaped portion and the number of welded portions, it becomes possible to weld wires having different wire diameters. Further, as a material to be welded, it can be directly welded to a terminal fitting or the like of an electric component, so that it has a great advantage that it can be applied to an assembly process of an electric component.

[Brief description of drawings]

FIG. 1 is a perspective view showing a molding jig for forming a plate-shaped portion on a wire according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of the lower die of FIG.

3 is a cross-sectional view of the lower die of FIG. 1 taken along line YY.

FIG. 4 is a perspective view showing a wire rod that has been rolled by the forming jig of FIG.

5 is a side view of the wire rod of FIG. 4. FIG.

FIG. 6 is an explanatory diagram showing a step of welding the wire rod of FIG. 4 by laser light irradiation.

7 is an explanatory view showing a welded portion of FIG.

FIG. 8 is an explanatory diagram showing a state in which a constriction occurs in the welded portion of FIG. 7.

FIG. 9 is an explanatory diagram showing welding of wire rods having different wire diameters.

FIG. 10 is an explanatory diagram for welding the ends of the wire rod.

FIG. 11 is an explanatory diagram for welding a wire rod into a T shape.

FIG. 12 is an explanatory diagram for welding a terminal fitting of an electric component and a wire rod.

FIG. 13 is an explanatory diagram showing reflection when a wire is irradiated with laser light.

FIG. 14 is an explanatory diagram showing a conventional method for welding a wire rod by laser light.

FIG. 15 is an explanatory view showing a state in which the wire rods are welded together by the welding method of FIG.

[Explanation of symbols]

 A molding jig L laser light (high energy beam) 1 lower mold 2 pressing mold 3 holding groove 4 plate-shaped recess 5 pressing part 6 curved surface 7 plate-shaped portion 7a curved surface 8 wire rod 11 terminal fitting

Claims (4)

[Claims] 1. When irradiating a wire material with a high energy beam for welding, a part of the wire material is rolled to form a plate-shaped portion, and the plate-shaped portion is superposed on the material to be welded to obtain high energy. A welding method for a wire rod, which comprises irradiating a beam. 2. The method for welding a wire rod according to claim 1, wherein the plate-shaped portion is a plate-shaped portion integrally formed with the wire rod by forming an arcuate curved surface at an end of the plate-shaped portion. 3. The method for welding a wire rod according to claim 1, wherein the material to be welded is a terminal fitting that constitutes an electric component. 4. A welding jig for a wire rod, comprising a lower die having a plate-shaped recess formed in a holding groove for receiving the wire rod, and a pressing die having a pressing portion having a curved surface at an end thereof.