JPH09314360A - Ultrasonic welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate interference of a horn of an ultrasonic welding machine with a work. SOLUTION: A projected part 2 of regular polygonal section is provided on one of a horn 1 or a welding tip 3 in an ultrasonic welding machine, and a recessed part 4 to which the projected part 4 is flitted is provided on the other. The welding tip 3 can be fitted to the horn 1 in an attachable/detachable manner by fitting the projected part 2 to the recessed part 4, and the welding tip 3 can be fitted to the horn 1 in a turned condition by the prescribed angle around the projected part 2. The horn is prevented from being interfered with a work by appropriately selecting the angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for ultrasonically welding an object to be welded by contact-pressurizing a welding tip to which ultrasonic vibration is transmitted from a horn to the object to be welded, and a welding machine therefor.

[0002]

2. Description of the Related Art Conventionally, when an object to be welded is ultrasonically welded by such an ultrasonic welding machine, as shown in FIG.
First, the welding tip 13 that matches the shape of the welding spot 7 of the workpieces 5 and 5 is attached to the tip of the horn 11.

Then, the welding tip 13 is brought into contact with the welding spots 7 of the objects to be welded 5, 5 to apply pressure, and at the same time, ultrasonic vibration is transmitted from the horn 11 to the welding tip 13.
The objects to be welded 5 and 5 are ultrasonically welded at the welding spot 7 by the ultrasonic vibration from the welding tip 13.

[0004]

In the above-mentioned ultrasonic welding, conventionally, as shown in FIG. 6, even when the objects to be welded 5 and 5 are long ones, work such as easiness of movement of the objects to be welded is performed. Due to the characteristics, the length direction of the object to be welded and that of the ultrasonic welding machine were the same. Further, at the time of welding, the objects to be welded 5, 5 may inevitably project toward the horn 11 side due to the relationship between the shape of the welding spot 7 and the direction of the welding tip 13.

In such a case, as shown in FIG. 7, when the welding tip 13 is lowered together with the horn 11 in order to press the welding tip 13 against the objects to be welded 5 and 5 on the anvil 6, the horn 11 and the object to be welded are lowered. Since the objects to be welded 5 and 5 come into contact with each other and the objects to be welded 5 and 5 are tilted on the anvil 6, there is a problem that welding failure occurs.

Further, since the welding tip 13 generally vibrates as shown by an arrow in FIG. 6, even in the welding of electric wires, the vibration direction and the length direction of the electric wires are the same (see FIG. 1). Therefore, the horn 11 may be touched by an electric wire or the like, and in that case, the above-described welding failure may occur. If the vibration direction and the length direction of the wire are at right angles,
The wire strands move with vibration, and frictional heat is less likely to be generated.

[0007] Therefore, an object of the present invention is to obtain an ultrasonic welding method and a welding machine therefor in which welding defects do not occur even in such a case.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 relates to an ultrasonic welding method, and the invention according to claim 1 relates to a long metal object. In ultrasonic welding for connecting parts, the length direction of the long object is shifted by a required angle with respect to the length direction of the ultrasonic welding machine so that the long object and the ultrasonic welding machine do not interfere with each other. is there. By avoiding such interference, the entire contact surface of the welding tip can be exactly fitted to the surface of the component to be welded, and good welding can be obtained. The required angle is arbitrary such as a right angle.

The invention described in claims 2 and 3 relates to an ultrasonic welding machine used in the above ultrasonic welding method, and the invention described in claim 2 has a welding tip in any direction with respect to a horn. It is designed to be attached to. In this way, the welding tip is set to match the welding spot of the work piece placed on the anvil, and the welding tip is set in that direction while avoiding interference with the work piece. The tip can be attached to the horn.

According to a third aspect of the present invention, one of the horn and the welding tip is provided with a convex portion having a regular polygonal shape or a circular cross section, and the other is provided with a concave portion into which the convex portion is fitted. By fitting the convex portion and the concave portion, the welding tip is detachably attached to the horn. By doing so, the welding tip is fixed to the horn while being rotated around the convex portion at a predetermined or arbitrary angle, so that the angle is arbitrarily adjusted so as to match the welding spot of the workpiece. Can be set.

[0011]

FIG. 1 shows an embodiment of an ultrasonic welding method according to the present invention. In this embodiment, the horn 1 is placed at a required angle, for example, at a right angle with respect to the length direction of the electric wire a. Shift and perform ultrasonic welding. With this configuration, the horn 1 does not interfere with the electric wire a. At this time, the vibration direction may be the length direction of the electric wire a.

2 to 4 show one embodiment of an ultrasonic welding machine according to the present invention, which is a horn 1.
A convex portion 2 projecting downward is provided at the tip of the.
The convex portion 2 is formed so that its cross section has a square shape. On the other hand, on the upper surface of the welding tip 3, a concave portion 4 into which the convex portion 2 of the horn 1 is fitted is formed.

Therefore, this ultrasonic welding machine has the convex portion 2
By fitting the concave portion 4 and the concave portion 4, the welding tip 3 that matches the welding spot 7 of the workpiece can be detachably attached to the tip portion of the horn 1.

In this ultrasonic welding machine, since the convex portion 2 is formed in a square cross section, FIGS. 2 (a) and 2 (b) are shown.
As shown in, the welding tip 3 can be attached to the horn 1 in a state in which the welding tip 3 is rotated around the convex portion 2 by 90 °.

Therefore, when performing the welding shown in FIG. 6, as shown in FIG. 3, the welding tip 13 shown in FIG.
When the welding tip 3 is attached to the horn 1 so that the welding tip 3 is rotated by 90 ° on the horizontal plane with respect to the direction of, the objects to be welded 5 and 5 do not project to the horn 1 side.
As shown in FIG. 4, even if the welding tip 3 is lowered together with the horn 1, the horn 1 does not come into contact with the objects to be welded 5 and 5, and the objects to be welded 5 and 5 do not incline on the anvil 6 satisfactorily. Welded.

At this time, as can be seen from the comparison between FIG. 3 and FIG. 6, the position and direction of the welding spot 7 with respect to the objects to be welded 5, 5 do not change at all.

Further, as shown in FIG. 5, when the convex portion 2 of the horn 1 is formed to have a circular cross section and the concave portion 4 of the welding tip 3 is formed so as to match the convex portion 2, the welding tip 4 is formed. Two
It can be fixed to the tip portion of the horn 1 while being rotated around an arbitrary angle. Therefore, even if the object to be welded 5 has a special shape, the object to be welded 5 is appropriately rotated on a horizontal plane so as not to project to the horn 1 side and placed on the anvil 6,
If the welding tip 3 is attached to the tip of the horn 1 at an angle that matches the direction of the welding spot of the workpiece 5, the workpiece 5
However, due to the contact with the horn 1, it is well welded without tilting on the anvil 6.

In this embodiment, the convex portion 2 has a square cross section and a circular cross section, but it may have an equilateral triangular shape.
It may be a regular polygonal shape having four or more corners. With a more regular polygonal shape, finer adjustment of the mounting angle becomes possible.

Further, a flexible joint mechanism is provided at the tip of the horn 1, and the welding tip 3 matching the welding spot 7 of the workpiece 5 is detachably attached to the horn 1 via the flexible joint mechanism. Good.

In this flexible joint mechanism, the welding tip 3 can be fixed to the horn 1 in an arbitrary direction in the attached state, and the ultrasonic vibration from the horn 1 can be efficiently transmitted to the welding tip 3. I shall.

In this way, the welding tip 3 can be brought into contact with the object 5 to be welded at various angles, so that the range of application is further expanded.

The ultrasonic welding machine shown in FIGS. 2 to 5 is shown in FIG.
Needless to say, the welding tip 3 can be used for welding the electric wire a, and the vibration direction of the welding tip 3 can be set arbitrarily.

[0023]

According to the present invention, the horn and the object to be welded are displaced in the longitudinal direction so that they do not interfere with each other, so that the object to be welded can be welded well without being tilted on the anvil.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of an ultrasonic welding method.

FIG. 2 is a perspective view of an embodiment of an ultrasonic welding machine.

FIG. 3 is a perspective view showing a usage state of the same embodiment.

FIG. 4 is a side view of the same usage state.

FIG. 5 is a perspective view of another embodiment of the ultrasonic welding machine.

FIG. 6 is a perspective view of a conventional ultrasonic welding machine in use.

FIG. 7 is a side view of the ultrasonic welding machine.

[Explanation of symbols]

 1, 11 Horn 2 Convex part 3, 13 Welding tip 4 Recessed part 5 Welding object 6 Anvil 7 Welding spot a Electric wire

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Jun Shiotani 1-7-10 Kikuzumi, Minami-ku, Nagoya-shi Harness Institute of Technology Co., Ltd.

Claims (3)

[Claims] 1. In ultrasonic welding for connecting metal parts of a long product, the long product and the ultrasonic product are displaced by shifting a length direction of the long product with respect to a length direction of an ultrasonic welding machine by a required angle. An ultrasonic welding method, characterized in that the welding machine does not interfere. 2. The ultrasonic welding machine used in the ultrasonic welding method according to claim 1, wherein a welding tip is detachably attached to a tip portion of the horn, and the welding tip is arbitrarily attached to the horn. Ultrasonic welding machine characterized by being installed in the direction of. 3. A convex portion having a regular polygonal shape or a circular cross section is provided on one of the horn and the welding tip, and a concave portion to which the convex portion is fitted is provided on the other, and the convex portion and the concave portion are fitted together. 3. The ultrasonic welding machine according to claim 2, wherein the welding tip is detachably attached to the horn.