JPH0691757A - Ultrasonic welding device - Google Patents

Abstract

PURPOSE:To make it possible to uniformly weld an optional range of an article to be welded continuously by controlling the phases of ultrasonic waves which are generated from a plurality of ultrasonic oscillators. CONSTITUTION:When ultrasonic waves with wave shapes shown by respective curves are generated from ultrasonic oscillators 2, 3, 4, 5, 6 which are arranged on the upper surface of a welding jig 1, respective ultrasonic waves become oscillatory waves and transmit the welding jig 1. The phases of ultrasonic waves which are generated from respective ultrasonic oscillators 2, 3, 4, 5, 6 are controlled in such a manner that the energy of the oscillatory waves may become the maximum at a focal point F, and the focal point F may continuously move. By this method, an optional range of an article to be welded can be continuously and uniformly welded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a supersonic device for producing ultrasonic waves from a plurality of ultrasonic vibrators to vibrate a welding jig to weld an object to be welded which is brought into contact with a contact surface of a welding jig. The present invention relates to a sonic welding device.

[0002]

2. Description of the Related Art Conventionally, FIG. 4 shows an ultrasonic welding apparatus for generating ultrasonic waves from a plurality of ultrasonic vibrators to vibrate the welding jig and weld an object to be welded in contact with the welding jig. There is such a configuration. As shown in FIG. 4, this conventional ultrasonic welding device is used to weld the welded objects A1 and A2 made of, for example, a polyolefin polymer material, when the welded objects A are welded.
While the contact surfaces of the welding jigs B1, B2, B3, B4, B5 are brought into contact with No. 1, ultrasonic horns C1, C2, C3, C4, C5 are contacted with the surface opposite to the contact surface of the welding portions. Then, when ultrasonic waves are emitted from the ultrasonic transducers D1, D2, D3, D4, D5 to the ultrasonic horns C1, C2, C3, C4, C5, the respective ultrasonic waves are ultrasonic horns. The welding jigs B1, B2, B3, B4, B5, which are in contact with the tips of the welding parts C1, C2, C3, C4, C5, are vibrated to generate frictional heat between the objects to be welded A1 and A2 and weld them together. It is what makes me.

[0003]

In the case of the above-mentioned conventional ultrasonic welding apparatus, the vibration energy is applied to the range of the objects to be welded A1, A2 with which the welding jigs B1, B2, B3, B4, B5 are in contact. To uniformly transmit the ultrasonic horn C1,
C2, C3, C4 and C5 must have appropriate shapes and high processing accuracy. Therefore, the cost of the ultrasonic horns C1, C2, C3, C4, C5 becomes high, and the welded material A between the adjacent welding jigs A
Since the vibration energy is difficult to be transmitted to the portions 1 and A2, uniform welding is difficult, and there is a problem that defective welding may occur.

Therefore, in the present invention, by controlling the phases of ultrasonic waves generated from a plurality of ultrasonic vibrators, it is possible to uniformly weld an arbitrary range of an object to be welded by an integrated welding jig. The technical problem to be solved is to realize high quality welding without using an expensive ultrasonic horn.

[0005]

The technical means for solving the above-mentioned problems is to provide a plurality of ultrasonic transducers on the surface of the welding jig which is in contact with the welding site and which faces the welding site contact surface. , Ultrasonic waves are generated from respective ultrasonic vibrators to vibrate the welding jig, and an ultrasonic welding device for welding the object to be welded is provided at one point on the contact surface of the welding portion of the welding jig. Is a maximum vibration point, and a phase control circuit for controlling the phase of the ultrasonic wave generated from each ultrasonic transducer is provided so that the maximum vibration point is scanned along the contact surface of the welded portion. It is to have a different configuration.

[0006]

According to the ultrasonic welding apparatus having the above-described structure, the phase control circuit is arranged so that one point of the contact surface of the welding portion of the welding jig becomes the maximum vibration point, and the maximum vibration point becomes the contact surface of the welding portion. Since the phases of the ultrasonic waves generated from the ultrasonic transducers are controlled so that the ultrasonic transducers are scanned along, the welding site of the object to be welded is uniformly welded by scanning the maximum vibration point.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a conceptual diagram for ultrasonically welding the adherends A1 and A2 made of, for example, a polyolefin-based polymer material. As shown in FIG. 1, the objects to be welded A1, A
The lower surface (welding portion contact surface) of the integral welding jig 1 is in contact with the second welding portion. On the other hand, ultrasonic transducers 2, 3, 4, 5, 6 are arranged on the upper surface of the welding jig 1. In such a configuration, when an ultrasonic wave having a waveform as shown by each curve is generated from the ultrasonic transducers 2, 3, 4, 5, 6 by an electric circuit described later, each ultrasonic wave becomes a vibration wave. Is propagated through the welding jig 1 and has the same phase, that is, the amplitude of the vibration wave at the focus F in the figure is the sum of the amplitudes of the respective vibration waves, and the vibration energy at the focus F becomes maximum. .

Next, the movement of the focus F will be described with reference to FIG. In FIG. 2, the curve shown in the welding jig 1 is a simplified view of the propagation of ultrasonic waves generated from the ultrasonic transducers 2, 3, 4, 5, 6.
The straight lines shown by the solid lines extending from the ultrasonic transducers 2, 3, 4, 5, 6 to the focal point F1 are the ultrasonic transducers 2, 3, 4, 4.
The distance between 5, 6 and the focus F1 is shown. Focus F1 Focus F2
When moving to the position of, the focal length from each ultrasonic transducer 2, 3, 4, 5, 6 changes as shown by the dotted line. If a sound wave is generated, that is, the ultrasonic transducer 2,
If ultrasonic waves are generated with a time delay in the order of 3, 4, 6, and 5, continuous focus movement is possible, and the same vibration energy is obtained at any movement point.

As described above, each ultrasonic transducer 2, 3,
Since the focal point F can be continuously moved by generating ultrasonic waves with a time delay from 4, 5, and 6, the welded portions of the objects to be welded A1 and A2 are welded continuously and uniformly. be able to.

Next, the control circuit of the embodiment will be described with reference to FIG. As shown in FIG. 3, the output circuits 7, 8, 9, 1 are provided to the ultrasonic transducers 2, 3, 4, 5, 6.
0 and 11 are connected. This output circuit 7, 8, 9,
10 and 11 energize each ultrasonic transducer 2, 3, 4, 5, 6 with a high-frequency current for generating ultrasonic waves of a predetermined frequency from each ultrasonic transducer 2, 3, 4, 5, 6. To do. On the other hand, the oscillating circuit 1 for oscillating high-frequency electric signals corresponding to the ultrasonic waves generated from the ultrasonic transducers 2, 3, 4, 5, and 6.
Two are provided. Then, the output circuits 7, 8,
The delay circuit 13, 9 and 10 is provided between the oscillator circuit 12 and the oscillator circuit 12,
14, 15, 16, and 17 are connected. In addition, the delay circuits 13, 14, 15, 16 and 17 include the control circuit 1
8 is connected.

The control circuit 18 includes the ultrasonic transducers 2, 2.
The ultrasonic waves are sequentially generated from 3, 4, 5 and 6 with a time delay, and the focal point F is continuously moved to generate the welding object A1,
This is for controlling the continuous welding of the A2 welded portion.
That is, the control circuit 18 generates ultrasonic waves generated from the ultrasonic transducers 2, 3, 4, 5, 6 for the delay circuits 13, 14, 15, 16, 17 in order to move the focus F. When the generation order command is given, each delay circuit 13, 14, 15, 16, 17 sequentially delays the output circuits 7, 8, 9, 10, 11 by a predetermined time. The high frequency electric signal from the oscillation circuit 12 is transmitted. As a result, each output circuit 7, 8, 9, 10, 11
Each ultrasonic transducer 2, according to the input of the high frequency electric signal.
A high-frequency current is applied to 3, 4, 5 and 6 to generate ultrasonic waves from the ultrasonic transducers 2, 3, 4, 5 and 6. The delay times in the delay circuits 13, 14, 15, 16 and 17 can be adjusted by each delay circuit or the control circuit 18.

As described above, the control circuit 18 sequentially generates ultrasonic waves with a time delay from each of the ultrasonic transducers 2, 3, 4, 5, 6 and continuously moves the focal point F to perform welding. It is controlled to continuously weld the welded portions of the objects A1 and A2.
In other words, each ultrasonic transducer 2, 3,
By controlling the phase of the ultrasonic waves generated from 4, 5, and 6, the focal point F of the ultrasonic waves is scanned over the entire welded portions of the welded objects A1 and A2, and the welded portions of the welded objects A1 and A2 are continuous. In addition, it is welded uniformly. Therefore, the delay circuits 13, 14, 15, 16, 17 and the control circuit 18 are
It constitutes the phase control circuit described in the claims.

[0013]

As described above, according to the present invention, a plurality of ultrasonic transducers are provided on the surface of the welding jig which is in contact with the welded portion of the object to be welded and which faces the welded portion contact surface. In an ultrasonic welding device for generating ultrasonic waves from each ultrasonic vibrator to vibrate the welding jig to weld the object to be welded, one point of the welding portion contact surface of the welding jig is the maximum vibration point. As such, and because the maximum vibration point is provided with a phase control circuit for controlling the phase of the ultrasonic waves generated from each of the ultrasonic transducers so as to be scanned along the contact surface of the welded portion,
It is possible to continuously and evenly weld the welded portions of the object to be welded without using an expensive ultrasonic horn with high processing accuracy, which is always necessary in the conventional ultrasonic welding apparatus.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of the configuration and basic operation of an embodiment of the present invention.

FIG. 2 is a conceptual diagram of movement of a maximum vibration point of ultrasonic waves in one embodiment of the present invention.

FIG. 3 is a control block diagram of an embodiment of the present invention.

FIG. 4 is a configuration explanatory view showing a configuration of a conventional ultrasonic welding device.

[Explanation of symbols]

 1 Welding jig 2-6 Ultrasonic transducer 7-11 Output circuit 12 Oscillation circuit 13-17 Delay circuit 18 Control circuit A1, A2 Welding object

Claims (1)

[Claims] 1. A plurality of ultrasonic transducers are disposed on a surface of a welding jig which is in contact with a welding portion of a material to be welded and which faces a welding portion contact surface, and ultrasonic waves are emitted from each ultrasonic transducer. An ultrasonic welding device for generating and vibrating the welding jig to weld the object to be welded, wherein one point of a welding portion contact surface of the welding jig is a maximum vibration point, and An ultrasonic welding apparatus comprising a phase control circuit for controlling the phase of ultrasonic waves generated from each ultrasonic transducer so that the vibration point is scanned along the contact surface of the welding portion.