JPH09262559A - Ultrasonic oscillator for liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an oscillating plate resonate at a required frequency without bringing about an unnecessary resonance of the oscillating plate by using a horn with approximately the same width as the width of the oscillating plate and connecting the horn with the oscillating plate over the whole region in the width direction. SOLUTION: An ultrasonic soldering apparatus provides a plurality of sets of an oscillator unit 100 constituted of an oscillating plate 40, a horn 50, a booster 60 and an oscillator 70. The oscillating plate 40 has an immersion part 41 positioned approximately at the central part, a pair of inclined parts 42 respectively inclined outward to upward from both ends of the immersion part 41 and a pair of outer edge parts 43 extending outward in parallel to each immersion part 41 from the top end part of each inclined part 42 and the immersion part 41 is immersed in a soldering tank. The horn 50 consists of an upper horn 51 and a lower horn 52 and they are removably connected with the oscillating plate 40 and have respectively the same width W as the width W of the oscillating plate 40 and are connected with the whole region in the width direction of the oscillating plate 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an object to be treated such as ultrasonic soldering equipment or ultrasonic cleaning equipment, which is immersed in the liquid by causing cavitation in the liquid stored in the tank. On the other hand, regarding the ultrasonic vibration device for liquid applied to the equipment that is subjected to the required treatment, in detail, while part of the vibration plate is immersed in the liquid stored in the tank, TECHNICAL FIELD The present invention relates to an improvement of an ultrasonic vibration device for liquid that causes cavitation in the liquid by connecting a vibrator to one end of the liquid through a horn and transmitting ultrasonic vibration of the vibrator to the diaphragm through the horn. .

[0002]

2. Description of the Related Art For example, in an ultrasonic soldering facility for soldering an object to be processed such as an aluminum part or an aluminum alloy part, a part of a metal diaphragm 1 is not shown as shown in FIG. The vibrator 3 is dipped in molten solder heated and stored in the solder bath, and a vibrator 3 is connected to one end of the diaphragm 1 in the longitudinal direction via a cylindrical horn 2, and the vibration based on an electric signal from an oscillator 4 is generated. By transmitting the ultrasonic vibration of the child 3, specifically the vibration of 20 to 40 KHz to the diaphragm 1 through the horn 2, the vibration system including the diaphragm 1, the horn 2 and the vibrator 3 resonates. Thus, cavitation is generated in the molten solder when soldering aluminum parts or the like.

According to such ultrasonic soldering equipment, the oxide film formed on the surface of the aluminum component or the like is destroyed by the action of the cavitation generated in the molten solder, so that the flux having a strong corrosive property is used. It is possible to solder the aluminum parts or aluminum alloy parts without using the.

[0004]

By the way, in the case of processing a large object to be processed in the ultrasonic vibrating apparatus as described above, a large tank is required and is stored in this large tank. A large vibration plate 1 is required to handle a large amount of liquid.

However, in the conventional device shown in FIG. 9, when the large diaphragm 1 is applied, the contact area with the cylindrical horn 2 in the width direction of the diaphragm 1 is reduced, so that the diaphragm is reduced. There is a possibility that unnecessary resonance may occur in the width direction of 1 as well.

Usually, in this type of device in which the resonance frequency of the vibration system changes due to factors such as the temperature rise of the heating portion and soldering work, the resonance frequency of the vibration system is always detected,
Since the control for automatically tracking the oscillation frequency of the oscillator 4 is performed based on the detected resonance frequency, when unnecessary resonance occurs in the vibration system as described above, oscillation is caused by the influence of the unnecessary resonance frequency. Automatic tracking of frequency becomes difficult.

Further, when the diaphragm 1 is enlarged, a large amount of vibration energy is required. Therefore, it is necessary to enlarge the entire vibration system such as the vibrator 3 and the cylindrical horn 2.

However, when the size of the entire vibration system is increased, it becomes difficult to resonate them at a desired frequency due to the sound velocity of the metal. In other words, when the size of the entire vibration system is increased, it becomes difficult to resonate only at a sufficiently low frequency, and it is possible that the large object cannot be subjected to the required processing.

In view of the above situation, the present invention is a liquid ultrasonic wave capable of resonating a vibrating system at a desired frequency without causing unnecessary resonance of the vibrating plate even when it is adapted to a large tank. It is a problem to be solved to provide a vibrating device.

[0010]

According to the present invention, a part of a vibration plate is immersed in a liquid stored in a tank, and a vibrator is connected to one longitudinal end of the vibration plate via a horn. In a liquid ultrasonic vibration device for generating cavitation in the liquid by transmitting ultrasonic vibration of the vibrator to the diaphragm through the horn, the horn has a width substantially equal to the width of the diaphragm. The above horn is applied, and the horn is connected over substantially the entire width direction of the diaphragm.

A plurality of sets of a single vibrating system unit having the vibrating plate, the horn and the vibrator,
It is possible to configure the ultrasonic vibrating device for liquid by arranging the plurality of sets of vibration system units close to each other in a mode in which the respective vibration plates are arranged side by side, and in this case, the plurality of sets of vibration system units are It is preferable to alternately arrange the horns on both sides of the tank.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing one embodiment. FIG. 5 and FIG.
1 is a conceptual illustration of ultrasonic soldering equipment to which an ultrasonic vibration device for liquids according to the present invention is applied. The ultrasonic soldering equipment illustrated here is applied when soldering to a large aluminum part (not shown) for an automobile, and the solder bath 20 is provided on the upper surface of the base frame 10 having a rectangular frame shape. Is equipped with.

The solder bath 20 has a heater 21 built therein and a rectangular bottom plate 23 disposed on the upper surface of the base frame 10 via a ceramic heat insulating material 22, and the bottom plate 2.
Inclining outward from each of the four edges of 3
One side plate 24 and an edge plate 25 that horizontally extends outward from each upper edge of each of the four side plates 24, and is an aluminum component (not shown) to be soldered as described above. It has a sufficient size, and the solder is heated inside and stored as molten solder 30.

The ultrasonic soldering equipment includes a diaphragm 40, a horn 50, a booster 60, and a bolt-clamped Langevin type Tra.
nsducer: hereinafter, simply referred to as a BLT oscillator) 70 includes a plurality of vibration system units 100, four in this embodiment.

As shown in FIGS. 1 and 4 to 6, the vibrating plate 40 has a length slightly shorter than the width of the bottom plate 23 in the solder bath 20 and is located at the substantially central portion thereof. 41 and a pair of slanted portions 42 extending from both ends of the dipping portion 41 so as to be slanted outwardly.
From the upper end of each inclined portion 42,
And a pair of outer edge portions 43 extending outward in a manner parallel to, and formed by a metal, for example, austenitic stainless steel (SUS304), is an elongated rectangle having a uniform plate thickness. It is configured by bending the thin plate member appropriately.

The horn 50 is made of aluminum (A707
5), and has an upper horn 51 and a lower horn 52 that are configured separately from each other. As shown in FIGS. 2 and 3, one of the diaphragms 40 is interposed between the upper horn 51 and the lower horn 52. The outer edge portion 43 is sandwiched, and a bolt 53 is fastened from the upper end portion of the upper horn 51 to the lower horn 52 so as to be detachably connected to the diaphragm 40.

The upper horn 51 and the lower horn 52 have the same length as each other, and each of them is the diaphragm 40.
1 when the ultrasonic wave of a frequency to be resonated, for example, 20 KHz is propagated by adding 1/2 of the plate thickness of
It is set to be a positive multiple of 1/2 wavelength (about 128 mm), which is 1 time (= 1/2 wavelength) in the present embodiment, and the outer edge portion 43 of the diaphragm 40 at the antinode of vibration when resonating. Holding Further, as is clear from FIGS. 1 and 3, the upper horn 51 and the lower horn 52 have the same width W as the width W of the diaphragm 40, and are vertically arranged at two positions in the width direction. The diaphragm 40 has a slit 54 extending in the direction.
While being connected over the entire width direction of the
The width of the part divided by 4 is 1 /
It is configured to be sufficiently shorter than two wavelengths.

The BLT oscillator 70 converts the electric signal supplied from the oscillator 80 into mechanical vibration and oscillates at a predetermined ultrasonic frequency to be resonated. One end portion in the axial direction of the BLT oscillator 70 passes through the booster 60. And is connected to the central portion of the lower surface of the lower horn 52.

As shown in FIGS. 5 to 7, each of the vibration system units 100 having the above structure has the solder bath 2 described above.
The vibrating plates 40 are arranged side by side with the horns 50 alternately arranged on both sides of 0.
While being immersed in the molten solder 30, they are held by the mounting bolts 12 on the unit mounting plate 11 of the base frame 10 via the mounting flanges 61 provided on the booster 60. Then, in the vibration system unit 100, when an electric signal is applied from the oscillator 80, the ultrasonic vibration of each BLT transducer 70 based on the electric signal is transmitted to the diaphragm 40 through the horn 50, and the diaphragm 40 and the horn. Resonance of 50 and the BLT oscillator 70 causes cavitation in the molten solder 30 that is heated and stored in the solder bath 20. The resonance of the diaphragm 40 at this time can be schematically shown as follows.
The state is as shown in FIG.

Here, in the above ultrasonic soldering equipment, since a large amount of molten solder 30 stored in the large solder bath 20 is vibrated by the cooperation of the four vibration system units 100, In the vibration system unit 100, it is not necessary to enlarge the vibration system such as the diaphragm 40, the horn 50, and the BLT vibrator 70, and the vibration system can easily resonate at a desired frequency. And good soldering can be performed.

Moreover, in each vibration system unit 100, the horn 50 has the same width W as the diaphragm 40, and the horn 50 is connected over the entire width direction of the diaphragm 40. Even if the diaphragm 40 is made as large as possible, it is possible to automatically control the oscillation frequency of the oscillator 80 according to the resonance frequency of the vibration system without causing unnecessary resonance in the width direction. Becomes

In the above-described embodiment, the vibration device applied to equipment for soldering aluminum parts is illustrated, but the present invention is not limited to this, and the cleaning liquid stored in, for example, a tank is used. It is also possible to apply to a so-called ultrasonic cleaning machine, which cleans a work by generating cavitation.

Further, in the above-described embodiment, since the horns are alternately arranged on both sides of the tank, not only the liquid stored in the tank can be uniformly vibrated,
Even if the width of the diaphragm is narrowed to improve the vibration energy per unit area, the diaphragms can be arranged as close to each other as possible without causing interference of the horn and the vibrator. For example, as shown in FIG. 8, a plurality of sets of vibration system units 100 may be arranged in parallel with each other in such a manner that the horns 50 are arranged on the same side.

Further, in the above-described embodiment, the width of the horn is made to match the width of the diaphragm completely. However, it is not always necessary to make it completely match, and the width of the horn is slightly narrower than the width of the diaphragm. The same effect can be expected by applying the above or applying a horn wider than the width of the diaphragm.

[0025]

As described above, according to the present invention,
Since the horn has the same width as the diaphragm and is connected over the entire width direction of the diaphragm, even when the diaphragm is made as large as possible to accommodate a large tank. It does not cause unnecessary resonance in the width direction.

Further, since a large amount of liquid stored in a large solder bath is vibrated by the cooperation of a plurality of sets of vibration system units, each vibration system unit has a vibration system such as a diaphragm, a horn and a vibrator. It is not necessary to upsize the vibration system, and the vibration system can be easily resonated at a desired frequency. Moreover, performance such as tank size and sound pressure level can be arbitrarily changed by the number of combinations of the same vibration system unit, which is advantageous not only in designing and manufacturing but also in terms of manufacturing cost and maintenance inspection. .

[Brief description of drawings]

FIG. 1 is a perspective view conceptually showing a single vibration system unit, showing an embodiment of an ultrasonic vibration device for liquids according to the present invention.

FIG. 2 is a side view of an essential part showing details of the vibration system unit shown in FIG.

FIG. 3 is an arrow view III in FIG.

FIG. 4 is a side view of the vibration system unit shown in FIG.

5 is a plan view conceptually showing ultrasonic soldering equipment to which the vibration system unit shown in FIG. 1 is applied.

6 is a sectional view taken along line VI-VI in FIG.

7 is a perspective view conceptually showing a side-by-side configuration of vibration system units in the ultrasonic soldering equipment shown in FIG.

FIG. 8 is a perspective view conceptually showing another arrangement mode of the vibration system units.

FIG. 9 is a perspective view conceptually showing a conventional ultrasonic vibration device for liquids.

[Explanation of symbols]

 20 ... Solder tank 30 ... Molten solder 40 ... Vibration plate 50 ... Horn 70 ... BLT vibrator 100 ... Vibration system unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuaki Suzuki 300, Takatsuka-cho, Hamamatsu-shi, Shizuoka Suzuki Stock Company

Claims (3)

[Claims] 1. A part of a vibrating plate is dipped in a liquid stored in a tank, and a vibrator is connected to one longitudinal end of the vibrating plate via a horn so that ultrasonic vibration of the vibrating plate is generated. A liquid ultrasonic vibrating device for generating cavitation in the liquid by transmitting to the diaphragm through the horn, wherein the horn having a width substantially equal to the width of the diaphragm is applied, and An ultrasonic vibrating device for liquid, wherein a horn is connected over substantially the entire width direction of the diaphragm. 2. A plurality of sets of a single vibration system unit including the vibration plate, the horn and the vibrator are provided, and the plurality of sets of vibration system units are arranged in parallel with each other. The ultrasonic vibrating device for liquid according to claim 1, wherein the ultrasonic vibrating devices for liquid are arranged close to each other. 3. The ultrasonic oscillating device for liquid according to claim 2, wherein the plurality of sets of vibration system units have the horns alternately arranged on both sides of the tank.