JPH10202752A - Ultrasonic welding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a horn from being deflected and remarkably reduce the limits such as the thickness and the area of a working material and realize a high quality welding by a method wherein the pressurizer of a pressurizing jig for pressurizing a horn is made to be a flexural vibration resonator having a nearly same resonant frequency as that of the horn and the loop point of the pressurizer pressurizes against the nodal point of the horn. SOLUTION: Into a movable housing, which is rollingly and continuously connected to a supporting stand and consists itself of a vibrator, a pressurizing jig 17 is connected in a cantilevered fashion so as to face its free end above a horn 14 under the condition that a pressurizer 19 is hangingly provided on the under surface at the free end of the pressurizing jig 17 by means of screws 18. In addition, the projecting bead part of the pressurizer abuts against the horn 14. The pressurizing jig 17 and the pressurizer 19 are made into an integral body and consists of a flexural vibration resonator having a nearly same resonant frequency as that of the horn 14. Especially, the screws 18 are arranged at the nodal points P2 of the pressurizer 19. At the same time, the projecting bead part is so constituted as to urge its loop point P3 at the intermediate position between the nodal pints P2 against the horn 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the field of ultrasonic bonding technology in which ultrasonic vibrations are applied to superposed ultrasonically joinable members such as metal or resin materials to join those members together. is there.

[0002]

2. Description of the Related Art Conventionally, an ultrasonic welding apparatus A as shown in FIG. 7 has been known.

In this apparatus A, a horn C for applying ultrasonic vibration to a workpiece W placed on an anvil B is provided by a diaphragm type resonance plate E having its projection C 'connected to a support cylinder D. It penetrates through the through hole E 'and is connected to a booster F disposed in the support tube D.
Through the through hole E ′ of the other diaphragm type resonance plate E,
This is a configuration connected to a converter G (known technology).

[0004] At the tip of the horn C, the workpiece W
In order to apply a high pressure to the horn C, a method of arranging the horn C to press the workpiece W at the minimum amplitude point (nodal point) of the horn C itself (a well-known technique) is also conceivable.

[0005]

Even in the above-mentioned prior art apparatus A, the work material W is pressed and welded while generating ultrasonic vibrations on the cantilevered horn C. There is no particular problem, but there are still issues to be improved.

That is, when welding the workpiece W as shown in FIG. 7, it is desirable to apply a pressing force in the direction of the arrow (X).
On the contrary, since the horn C may be bent in the direction of the arrow (Y), the pressing force is limited, and as a result, the thickness and the area of the work material are limited.

In the above-mentioned known technique, heat and wear are generated in each part of the connecting means due to the expansion and contraction of the vibrating horn C itself. Practicality was questioned because of the possibility of causing this.

A first problem to be solved by the present invention is to prevent the above-described horn bending phenomenon from occurring and to greatly reduce the limitations on the thickness and area of the work material to achieve high quality. The object of the present invention is to provide a welding process capable of welding.

A second problem to be solved by the present invention is to provide an excellent device which has a simple structure and can be manufactured at low cost.

A third object of the present invention is to provide a pressurizing jig in which a pressurizing element in a pressurizing jig is stably connected, is maintenance-free, and has high practicality.

[0011]

Means for solving the above problems are as follows.

(1) An apparatus for performing welding processing by applying ultrasonic vibration together with a pressing force to a work material such as a metal or resin material which is supported by being superposed, and a pressing jig for pressing a horn An ultrasonic welding apparatus, wherein the pressurizing element is formed as a flexural vibration resonator substantially equivalent to the resonance frequency of the horn, and the nodal point of the horn is pressurized at the maximum amplitude point.

(2) The ultrasonic welding apparatus according to the above (1), wherein the pressurizing element is connected to the pressing jig by a screw at a nodal point of the pressing element.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) In the ultrasonic welding apparatus according to Embodiment 1 shown in FIGS. 1 to 3, the ultrasonic welding apparatus is provided on a fixed support base 10 so as to be able to undulate freely with an undulation point (P1) as a fulcrum. A converter 13 and a booster 12 connected thereto are disposed in a movable housing 11 which itself constitutes a vibrating body. A horn 14 is connected to the other side of the booster 12 in a cantilever manner. The vibrator 14 'at the outer end of the horn 14 projecting from the movable housing 11 is
This is opposed to the anvil 15 which is continuously provided so that the height can be adjusted.

As shown in FIG. 4, a pressing jig 17 is cantilevered by a first screw 16 on the movable housing 11, and the free end of the pressing jig 17 is
The pressurizing jig 17 is provided with a pressurizing element 19 suspended from the lower end of the free end of the pressurizing jig 17 by a second screw 18, and the ridge 20 is brought into contact with the horn 14. The pressurizing jig 17 and the pressurizing element 19 are integral with each other, and themselves constitute a flexural vibration resonator equivalent to the resonance frequency of the horn 14, particularly as shown in FIG. The second screw 18 is arranged at the nodal point position (P2) of the pressurizing element 19, and the ridge 20 is formed at the maximum amplitude point (P3) at an intermediate position of the nodal point (P2).
Is configured to be pressed against the horn 14.

In the figure, reference numeral 21 denotes a height adjusting tool for the anvil 15 by means of a screw means, which can change the position of the anvil 15 which can be raised and lowered in the guide rail 22 with respect to the support base 10 by means of an adjusting screw 23. It was done.

Next, the use of the ultrasonic welding apparatus 1 will be described. After adjusting the height of the anvil 15 by the adjusting tool 21 in advance according to the thickness of the workpiece W, the converter 1
3 and the booster 12 are activated to oscillate the horn 14, and the movable housing 11 is set with the undulating point (P1) as a fulcrum.
Is turned in the counterclockwise direction (FIG. 1), and the vibrator 1
The welding process is performed on the anvil 15 by applying vibration and pressure to the workpiece W by bringing the horn 4 'into contact with the workpiece 4'. At this time, the clockwise deflection of the horn 14 due to the reaction force of the anvil 15 is increased. The pressing element 20 of the pressing jig 19 urges the cantilevered horn 14 in a counterclockwise direction. The pressing jig 19 and the pressing element 20 are integrally formed, and are equivalent to the horn 14 themselves. Since the flexural vibration resonator of (1) is constituted, the nodal point of the horn 14 is pressed at the maximum amplitude point (P3) in the radial direction. Can be subjected to an ultrasonic welding process.

The second screw 18 has a high safety because there is no danger of loosening due to vibration because the pressing jig 17 and the pressing element 19 are connected at the nodal point (P2). You can say that.

(Embodiment 2) FIG. 6 shows Embodiment 2
5 is different from that shown in FIG. 5 in that the horn 14A is rectangular and the pressing jig 17
The horn 14A is configured to press the horn 14A at the maximum amplitude point (P3) by the two ridges 19A 'of the pressurizing element 19A vertically attached to A. Therefore, the description is omitted.

[0020]

The specific effects provided by the present invention described above are as follows.

Since the welding can be performed by applying a high pressing force while preventing the vibration means from being bent by the pressurizing means, even a work material having a large thickness or area can be effectively used in a low energy state. It can be welded.

Since the welding process can be performed with the applied pressure increased, a high quality welding process can be performed even when an oscillator having a relatively low level of oscillation capability is employed.

Since it is only necessary to connect the pressing means of the horn to the vibrating means, it is possible to avoid complication of the structure, and it has a simple configuration, and the pressing means is stably attached. Maintenance work is facilitated.

[Brief description of the drawings]

FIG. 1 is a side view of an ultrasonic welding apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a front view of FIG. 1;

FIG. 4 is a side view of a main part of FIG. 1;

FIG. 5 is a partial front view of FIG. 2;

FIG. 6 is a partial front view of a main part of the ultrasonic welding apparatus according to the second embodiment of the present invention.

FIG. 7 is an assembly view of the prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ultrasonic welding apparatus 14, 14A Horn 17, 17A Pressing jig 18 Second screw 19, 19A Pressurizer

Claims (2)

[Claims] An apparatus for performing a welding process by applying an ultrasonic vibration together with a pressing force to a work material such as a metal or a resin material which is supported by being superposed, comprising a pressing jig for pressing a horn. An ultrasonic welding apparatus in which a pressurizing element is formed as a flexural vibration resonator substantially equivalent to the resonance frequency of a horn, and pressurizes a nodal point of the horn at its maximum amplitude point. 2. The ultrasonic welding apparatus according to claim 1, wherein the pressing element is connected to the pressing jig by a screw at a nodal point of the pressing element.