JP2000202642A - Horn for ultrasonic welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a projected conductor from being cut when welding the conductors of a wire to a metallic plate. SOLUTION: In an ultrasonic welding machine which has been set to perform ultrasonic welding by interposing a metallic plate and the conductors 15a of the end part of a wire 15 between a horn tip 12w and an anvil 13, a holding part 13a is recessed, which receives the conductor 15a on the lower surface of the horn tip 12. By forming continuous uneven parts on an opposing surface to the anvil 13 in side wall parts 13c on both sides of the holding part 13a, the recessed part of the uneven part is made to be a relief space receiving a projected conductor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic welding horn for performing ultrasonic welding between a horn tip and an anvil, and more particularly, to cutting a protruding core wire when welding a core wire of an electric wire to a metal plate. It is to prevent that.

[0002]

2. Description of the Related Art Conventionally, as a horn 1 for ultrasonic welding,
As shown in FIG. 7 (A), a horn tip 3 to which ultrasonic vibration is applied is provided at a position above the anvil 2 on which an object to be welded is placed, and the horn tip 3 is lowered to be in contact with the anvil 2. There is known an apparatus in which an object to be welded is sandwiched therebetween to perform ultrasonic welding. For example, when the core wire 5a of the terminal of the electric wire 5 is ultrasonically welded to the metal plate 4 such as a bus bar, a holding portion 3a for receiving the core wire 5a is provided on the lower surface of the horn tip 3, and the core wire 5a is formed by the holding portion 3a. The bundled state is pressed against the metal plate 4 on the anvil 2 to perform ultrasonic welding.

[0003]

However, at the time of welding, the core wire 5a is separated and protrudes laterally.
May occur. In this case, the protruding core wire 5b
Departs from the holding portion 3a of the horn chip 3 and enters a region sandwiched between the lower surfaces of the side walls 3b on both sides and the metal plate 4 on the anvil 2. At the time of welding, the bundle of the core wires 5a is
There is almost no gap between the lower surface of the side wall portion 3b and the metal plate 4 on the anvil 2 so as not to escape from the outside. Therefore, if the protruding core wire 5b exists in a region sandwiched between the side wall portion 3b and the metal plate 4, the core wire 5b may be cut at the edge of the side wall portion 3b. As a result, there is a possibility that the cut pieces of the core wire 5b may adhere to unexpected parts or scatter, thereby adversely affecting the electric circuit.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides an ultrasonic welding horn in which a protruded core wire is not cut when the core wire of an electric wire is ultrasonically welded to a metal plate. Is an issue.

[0005]

In order to solve the above-mentioned problems, according to the present invention, an ultrasonic welding is carried out by sandwiching a metal plate and a core of an electric wire end between a horn tip and an anvil. In the ultrasonic welding horn, a holding portion for receiving a core wire is recessed on a lower surface of the horn tip, and a continuous uneven portion is formed on a surface of the side wall on both sides of the holding portion facing the anvil. The ultrasonic welding horn is characterized in that the concave portion of the concave and convex portion is a clearance space for receiving the protruded core wire.

According to the above structure, even when the protruded core wire is located between the side wall portion of the horn tip and the metal plate on the anvil during the ultrasonic welding, the protruded core wire is accompanied by the lowering of the horn tip. Since it enters into the relief space of the uneven portion formed on the facing surface, it can be prevented from being crushed and cut. Thereby, at the time of welding, since the side wall of the horn tip can be set at a position where the gap between the horn tip and the metal plate on the anvil almost disappears, the core wires bundled in the holding portion do not escape outward. Ultrasonic welding can be reliably performed on the metal plate in a bundle.

It is preferable that the uneven portion is formed of a continuous truncated quadrangular pyramid-shaped projection. In this way, the protruding core wire sandwiched between the uneven portion on the lower surface of the side wall portion and the metal plate on the anvil can be surely inserted into the most recessed escape space along the slope of the truncated pyramid-shaped projection. Can be led to.

Preferably, the clearance spaces are arranged obliquely to the length direction of the facing surface. Since the core wire protruding from the bundle of core wires is usually oriented obliquely to the direction of the bundle of core wires, it matches the direction of the escape space, so that the protruded core wire is smoothly and smoothly introduced into the escape space. be able to.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an ultrasonic welding horn 11. In this embodiment, a core wire 15 a exposed at the end of an electric wire 15 is attached to a metal plate 14 such as a bus bar or a copper foil made of a copper plate.
Are superimposed, sandwiched between the anvil 12 and the horn tip 13 and ultrasonically welded.

The horn tip 13 has a holding portion 13a which is recessed in a triangular mountain shape in the longitudinal direction thereof to receive a core wire 15a to be welded on the lower surface. Holder 1
As shown in FIGS. 2 and 3 (A), a plurality of concave grooves 13b extending in the width direction are formed at required intervals on the inner processing surface of the inner surface 3a to improve the holding force on the core wire 15a and to generate ultrasonic waves. Can be transmitted efficiently.

As shown in FIGS. 3 (A) to 3 (C), the lower surface of the side wall portion 13c hanging down on both sides of the holding portion 13a, that is, the surface 13d facing the anvil 12, has a thickness of about 0.1.
An uneven portion 16 having a width of 5 mm and having a truncated square pyramid-shaped projection 16a having a vertical angle of about 90 ° is formed. The protrusions 16a in the uneven portion 16 are arranged such that vertices are arranged along the length direction of the opposing surface 13d at the center of the opposing surface 13d.

In this embodiment, while the diameter of one core wire 15a of the electric wire 15 to be welded is about 0.32 mm, the distance L1 between the adjacent projections 16a is 0.25 mm.
And the vertex width L2 is set to about 0.05 mm. The protrusion 16a of the truncated pyramid is adjacent to the protrusion 16a.
Between the bottom surface 16d and the opposite surface 13d in the longitudinal direction.
It is arranged so as to face the direction of 5 °, and the depth L3 of the bottom groove 16c is
Is set to about 0.1 mm. The space between the adjacent projections 16a is a clearance space 16d for receiving the protruding core wire 15b.

The ultrasonic welding horn 11 having the above-described structure.
In order to weld the core wire 15a of the electric wire 15 onto the metal plate 14 by using the method, first, the metal plate 14 is placed and fixed on the anvil 12 as shown in FIG. Next, the core wire 1 exposed from the terminal of the electric wire 15 along the length direction on the metal plate 14.
The bundle of 5a is positioned and placed. After a while, FIG.
As shown in (B), the core wire 15a is pressed against the metal plate 14 in a state where the horn tip 13 is lowered and the bundle of the core wires 15a is received in the holding portion 13a, and at the same time, ultrasonic vibration is applied to the horn tip 13. Thus, the core wire 15a is ultrasonically welded to the metal plate 14.

Usually, the bundle of the core wires 15a is
Are welded in a state where they are all received in the holding portion 13a, but the core 15a is separated and the protruding core 15b
Exists between the opposing surface 13 d of the side wall portion 13 c and the metal plate 14 on the anvil 12.
In this case, as shown in FIGS. 5A and 5B, as the horn tip 13 descends, the protruding core wire 15b comes into contact with the uneven portion 16 and at the same time is guided by the slope of the truncated pyramid-shaped projection 16a. Into the escape space 16d. Since the escape space 16d is formed along the bottom groove 16c running in the oblique direction, the escape space 16d matches the direction of the core wire 15b that protrudes obliquely from the bundle of the core wires 15a, so that the protruded core wire 15b is smoothly and smoothly. It is introduced into the escape space 16d.

In the above state, the depth of the bottom groove 16c is set to be slightly smaller than the diameter of the protruding core wire 15b, and the interval between the adjacent projections 16a of the protrusion 16a is set to be slightly smaller than the protruding core wire 15b. I have. Therefore, the protruding core wire 15b is pressed against the metal plate 14 on the anvil 12 as shown in FIG. 5B, and is welded onto the metal plate 14 by receiving the ultrasonic vibration of the horn tip 13. You. In this way, as shown in FIG. 6, a workpiece in which the core wires 15a and 15b are ultrasonically welded to the metal plate 14 is obtained.

[0016]

As is clear from the above description, according to the ultrasonic welding horn of the present invention, even if the protruding core wire is sandwiched between the side wall of the horn tip and the metal plate on the anvil. By introducing the protruding core wire into the relief space of the uneven portion formed on the side wall portion, the cutting of the core wire can be prevented. Therefore, it is possible to prevent electrical adverse effects due to scattering and adhesion of the cut core wire.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an ultrasonic welding horn according to the present invention.

FIG. 2 is a partial sectional view of a horn tip.

FIG. 3A is an enlarged bottom view of a horn tip, and FIG.
3A is a cross-sectional view taken along line AA of FIG. 3A, and FIG. 3C is a vertical cross-sectional view taken along line BB of FIG.

FIGS. 4A and 4B are views showing a welding process.

5A is a bottom view of the horn tip in a state where the protruded core wire is introduced into an escape space of the horn tip, and FIG. 5B is a cross-sectional view taken along line CC of FIG.

FIG. 6 is a perspective view of an ultrasonically welded workpiece.

FIGS. 7A and 7B are diagrams showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Ultrasonic welding horn 12 Anvil 13 Horn tip 13a Holding part 13c Side wall part 13d Opposing surface 14 Metal plate 15 Electric wire 15a Core wire 16 Uneven part 16a Projection 16d Escape space

Claims (3)

[Claims] 1. A horn for ultrasonic welding in which a metal plate and a core wire of an electric wire end are sandwiched between a horn tip and an anvil and ultrasonically welded, a holding portion for receiving the core wire on a lower surface of the horn tip. And a continuous concave / convex portion is formed on a side surface of the side wall portion on both sides of the holding portion facing the anvil, and the concave portion of the concave / convex portion serves as an escape space for receiving the protruding core wire. Horn for ultrasonic welding. 2. The ultrasonic welding horn according to claim 1, wherein the uneven portion comprises a continuous truncated quadrangular pyramid-shaped projection. 3. The ultrasonic welding horn according to claim 1, wherein the clearance spaces are arranged obliquely to a length direction of the facing surface.