JP2003290719A - Large capacity ultrasonic wave composite vibrator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a large capacity ultrasonic composite vibrator which has rigidity as a composite vibrating body for various kinds of powerful ultrasonic waves. <P>SOLUTION: The n sets of BLTs (1, 1', 2, 2',...n, n') having the same properties are arranged at the outer circumference part of a disk vibration body 4 oppositely to each other and at regular intervals. Each opposite BLT is driven in an opposite phase mode. A phase between adjacent BLTs of each set is driven in a vibration mode to shift the phase by π/n. A vibration rod joined at the center of the disk vibration body is excited by a composite vibration output having a vibration capacity of n times of one set of BLT induced at the center of the disk vibration body 4. A plurality of vibrators are joined to further increase the vibration capacity. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic processing machine for vibration processing (bonding, cutting, polishing, plastic working, etc.) of metals, plastics, ceramics, electronic parts, etc. The present invention relates to a sound wave composite vibration device.

[0002]

2. Description of the Related Art Conventionally, as an ultrasonic composite vibration device, one disclosed in Japanese Patent Laid-Open No. 11-87437 has been known. The conventional technique excites a complex bending vibrating body with two orthogonal vertical driving oscillators.

[0003]

However, in the prior art, it is impossible to provide a large capacity (large output) of vibration energy because the bending vibration rod is excited by the two driving vertical vibrators. There was a limit to the range of application as a wire bonder with a wire diameter of 0.7 mm or less.

Therefore, a large-capacity ultrasonic compound vibration device has been earnestly desired for spot welding of metal plates other than wires, seam welding, plastic joining, ultrasonic machining such as plastic working of metal.

An object of the present invention is to provide a large-capacity ultrasonic composite vibration device by installing a plurality of sets of ultrasonic vibrators on a disk vibrating body in which a vibrating body material is rich in rigidity and vibration loss is small. It is in.

[0006]

In order to solve this problem, the present invention provides a plurality of sets of ultrasonic transducers, which are opposed to each other and are driven in reverse phase, at equal intervals on the outer peripheral portion of a disk vibrating body. It was made by finding that the central part of the disk vibrating body induces a complex vibration that draws a Lissajous locus.

According to the first aspect of the present invention, n sets (n ≧ 2) of bolted Langevin type ultrasonic transducers (hereinafter abbreviated as BLT) having the same characteristics are opposed to the outer periphery of the disk vibrating body having a vibration loop at the center. Then, the BLTs facing each other are driven in a reverse phase mode, and the phases between adjacent BLTs in each set are driven in a vibration mode in which the phase is shifted by π / n. This is a large-capacity ultrasonic composite vibration device having a structure in which the central part performs composite vibration.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, a vibration antinode portion of a vibrating rod that vibrates in a complex bending vibration mode is coupled to the central portion of the disk vibrating body. Is.

[0009]

Operation When the first set of BLTs vibrate with the longitudinal vibrations of opposite phases, the disk vibrating body mechanically coupled to the BLTs of both BLs
It is excited in the diametrical direction connecting the axis of T. First set of BLT
To the second set of BLTs next to the first set by delaying the π / n phase from
And further delays the π / n phase from the second set to excite the BLT of the third set adjacent to the second set, and similarly, BL up to the nth set.
Excite T.

The disk vibrating body is excited by n sets of BLTs, the central part thereof induces a composite vibration that draws a Lissajous locus, and the vibration output has a capacity of 2n times that of the BLT alone. By connecting the vibration antinode of the vibrating rod that vibrates in the compound bending vibration mode to the center of the disc vibrating body, a compound vibration output with a large capacity of 2n times that of a BLT unit can be obtained from the tip of the vibrating rod. Is possible.

Therefore, a large-capacity ultrasonic compound vibration machine, moving device, etc. are provided by mounting a tool, a slider, etc. for ultrasonic compound vibration processing according to the purpose on the tip of this vibrating rod. Can be done.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the principle of a large-capacity ultrasonic composite vibration device of the present invention, FIG. 2 is an external view showing a structural example of a vibration system, and FIG. It is an actual measurement figure which shows a vibration mode.

As shown in FIG. 1, three sets (n = 3) of BLTs 1, 1 ′, 2, 2 ′, 3, on the outer peripheral portion of the disk vibrating body 4 are provided.
3'is arranged at equal intervals. As shown in FIG. 2, a vibrating rod 5 which is excited in the composite bending vibration mode is vertically connected to the disc vibrating body at the center of the disc. The connection of each part of the vibration system shown in FIG. 2 is a structure having high rigidity because all are connected by a central bolt (not shown). Each BLT has a bolted Langevin type structure in which the electrostrictive element 6 is sandwiched between metal blocks, and six BLTs having uniform vibration characteristics are used.

The pair of BLTs 1, 1 ′ facing each other are connected to the oscillator 13, the power amplifier 10 with a phase shifter, and the output transformer 7, and electric signals are applied by the output transformer 7 in opposite phases to each other. Therefore, when the BLT1 is in the elastic vibration mode 15 that expands by an electric signal, B
LT1 'becomes the elastic vibration mode 16 which shortens. In this case, the center of the disk vibrating body 4 is displaced in the direction from BLT1 to BLT1 '. The vibration mode of BLT1 → disk vibrating body 4 → BLT1 ′ is 14, and the center of the joint between the disk vibrating body and the vibrating round bar is vibration mode 17 in the axial direction of BLT1, 1 ′.

The phase shifter-equipped power amplifier 11 and the output transformer 8 drive the BLT 2, 2 ′ by delaying π / 3 phase from the driving of the BLT 1, 1 ′, and then the phase shifter-equipped power amplifier 12 and the output transformer 9 Drive the BLTs 3 and 3 ′ by further delaying the π / 3 phase.

The central portion of the disk vibrating body 4 becomes a vector sum due to the vibrations of the three sets of BLTs, and induces a composite vibration that draws a litharge locus.

Therefore, the vibrating rod 5 is excited by the composite vibration induced in the disc vibrating body 4, and the vibration mode at the tip thereof becomes the elliptical vibration in FIG. The elliptical vibration locus is generated by a slight difference between the drive voltage of each BLT and the resonance frequency, and can be made circular by adjusting each drive voltage and drive phase of the power amplifier with the phase shifter.

In FIG. 1, the material of the disk vibrating body 4 is steel S4.
5C (diameter 126 mm, thickness 40 mm), longitudinal resonance frequency of each BLT is 27 kHz (diameter 40 mm), vibration round bar 5
Is made of steel S45C (diameter 40 mm, length 366 m
m) and the drive voltage of each BLT is 150 Vrms, the composite vibration displacement amplitude of the vibrating rod 5 is 4.5 μm.
was gotten.

According to this embodiment, there are the following effects. The signal of the oscillator 13 tuned to the resonance frequency of the BLT is sequentially π / n in the power amplifiers 10, 11 and 12 with phase shift.
The output signal is output from the output transformers 7, 8 by shifting the phase by
9 is applied. This signal is a transformer with a center tap 7,
Two signals in the opposite phase mode are applied to each other by 8 and 9 and are applied to each set of BLTs.

The BLT converts an electric signal into a mechanical elastic vibration and drives the disc vibrating body 4. The center of the disc vibrating body serves as an antinode of the vibration to induce the composite vibration, and the vibration output is BL.
6 times that of T alone.

The vibrating rod 5 coupled to the center of the disc vibrating body 4 is excited by the composite vibration at the center of the disc vibrating body, and its tip becomes the composite vibration, and the output is 6 times as large as that of the BLT simple substance and has a large capacity. An ultrasonic compound vibration device can be realized.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and a design change is made within the scope not departing from the gist of the present invention. Even so, it is included in the present invention. For example, the vibration amplitude can be arbitrarily set by changing the thickness at the longitudinal vibration node of the disk vibrating body or changing the diameter at the node surface of the vibrating round bar (stepped vibrating body or the like).

The installation positions of the BLTs do not necessarily have to be at equal intervals, and the installation positions can be changed appropriately.

In the embodiment, the transformer with the intermediate tap is used for one set of BLTs that are driven in the opposite phase mode, but if the polarization directions of the electrostrictive elements forming the BLTs are opposite to each other, an electric signal is generated. Can be applied in the same phase, and a transformer with an intermediate tap can be eliminated.

Further, disc vibrating bodies having a large number of BLT transducers installed on the outer periphery of M pieces are cascade-joined by vibrating round bars so that the vibration phases are matched, and the BLT transducers of each disc vibrating body are driven in parallel. As a result, it is possible to configure an M-times large capacity ultrasonic composite vibration device.

Further, by changing the driving phase of each pair facing each other so that the center of the disk vibrating body serves as the vibration loop and the vibration node, the vibrating round bar installed at the center of the disk is driven by bending vibration and longitudinal vibration. It is possible to realize two-dimensional and three-dimensional compound vibration of the vibrating rod tip.

It is also possible to construct a large-capacity composite vibration source by installing a large number of BLTs on the composite vibration rod in consideration of the vibration phase.

These ultrasonic composite vibration sources use the output of a vibration detector installed at an appropriate position of the vibrating body, or detect and use the dynamic admittance of the vibration source to use a resonance frequency automatic tracking type feedback oscillator. Can be configured, and further, the vibration amplitude and the vibration output can be controlled to be constant.

The drive frequencies of the BLTs of the respective groups do not necessarily have to be the same, and even if the envelope is a complex vibration locus having a square / rectangular envelope instead of an elliptical / circular shape, a similar effect is obtained for the purpose of joining or the like. Is obtained.

[0030]

As described above, according to the present invention, it is possible to obtain a large-capacity ultrasonic composite vibrating device in which the vibrating body is rich in rigidity.

[Brief description of drawings]

FIG. 1 is a block diagram showing the principle of a large-capacity ultrasonic composite vibration device of the present invention.

FIG. 2 is an external view showing a configuration of a large-capacity ultrasonic composite vibration system of the present invention.

FIG. 3 is an actual measurement diagram showing a vibration mode at the center of the vibrating round bar tip of the large-capacity ultrasonic composite vibration device of the present invention.

[Explanation of symbols]

11 1,1 ', 2,2', 3,3 'BLT 4 disk vibrator 5 vibration round bar 6 Electrostrictive element 7,8,9 output transformer Power amplifier with phase shifter 13 oscillators 14 Vibration mode of disk vibrating body by BLT1, 1 ' 15, 16, 17 Indicates the vibration direction of each part 18 Compound vibration mode (vibration locus) of the tip of the vibrating rod 5

Claims (3)

[Claims] 1. Two or more sets of bolted Langevin type ultrasonic transducers having the same characteristics are installed on the outer peripheral portion of a disk vibrating body having a vibration loop at the center, and n sets are opposed to each other at equal intervals. The ultrasonic transducers are driven in antiphase mode, and the ultrasonic transducers in each set are driven in a vibration mode in which the phase between adjacent ultrasonic transducers is shifted by π / n, so that the central portion of the disc vibrator vibrates in a complex manner. Large-capacity compound vibration device characterized by having a structure. 2. The large-capacity ultrasonic composite vibration device according to claim 1, wherein the disk vibrating body has a structure in which a central portion of the vibrating body is coupled to a vibration antinode of a vibrating rod vibrating in a composite bending vibration mode. 3. A large-capacity ultrasonic transducer configured such that the disc vibrators are cascade-joined by vibrating round bars with their vibration phases matched and the ultrasonic transducers of each set of the disc vibrators are driven in parallel or independently. Sound wave compound vibration device.