JPH02233184A - ultrasonic transducer - Google Patents

Abstract

PURPOSE:To reduce the generation of cavitation erosion by providing a Stellite layer to the ultrasonic vibration surface of an ultrasonic vibration plate or vibration member for ultrasonic washing or forming the entire surface thereof from Stellite. CONSTITUTION:A tool 1 for ultrasonic processing is connected to an amplifying horn 5 and an ultrasonic vibrator 4 through a flange support 6 and a small diameter columnar part 1b is integrally provided to the columnar part 1a of said tool 1 from alloyed steel so as to extend from the central part of the leading surface of said columnar part 1a and a Stellite layer 2 is formed to the leading end surface becoming an ultrasonic vibration surface so as to interpose a metal material 3 having the intermediate properties of Stellite and alloyed steel by weld-padding. The ultrasonic signal from an ultrasonic oscillator 8 is applied to the vibrator 4 to apply ultrasonic vibration to the water A in a water tank 11. By this method, the cavitation erosion generated in an ultrasonic vibration plate or the vibration member of the tool can be reduced.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an ultrasonic vibrator equipped with a vibrating member at its tip, such as an ultrasonic diaphragm for ultrasonic cleaning or a tool for ultrasonic machining. It is something.

[Prior art] In the past, for example, in ultrasonic processing machines, processing using homogenizers and free abrasive grains, processing using ultrasonic welders for welding plastic, etc., use tools (horns) using alloy steel, titanium, stainless steel, etc. The tool is attached to the tip of an ultrasonic vibrator, and the machining operation is performed while the tool is vibrated ultrasonically by the ultrasonic vibrator.

On the other hand, in an ultrasonic cleaning machine, an ultrasonic diaphragm to which an ultrasonic vibrator is attached is installed in a cleaning tank, and cleaning is performed by ultrasonic vibration in a cleaning solution. Similarly, they were made of alloy steel, titanium, stainless steel, etc.

In addition to the above-mentioned tools, the tools for ultrasonic machining include:
It is known that corrosion resistance and erosion resistance are improved by brazing a cemented carbide tip to the tip of the tool or by plating the surface of the diaphragm for ultrasonic cleaning. There is.

[Problems to be solved by the invention] In machining using conventional homogenizers and free abrasive grains, when the tip of the tool is immersed in liquid and subjected to ultrasonic vibration, and with the conventional diaphragm for ultrasonic cleaning, When ultrasonic vibration is applied in the cleaning liquid, cavitation occurs and the vibrating liquid gives a strong impact to the tip and diaphragm surfaces of the tool, resulting in erosion on the tip and diaphragm surfaces of the tool, respectively. This problem occurred relatively quickly and shortened the lifespan of tools and ultrasonic diaphragms.

Furthermore, processing using an ultrasonic welder has a problem in that the life of the tool is short due to friction between the tool and the welded object.

The present invention has been made in order to solve the above-mentioned problems, and it is difficult for erosion etc. to occur during ultrasonic vibration in the ultrasonic diaphragm attached to the tip of an ultrasonic vibrator or a vibrating member such as a tool. The purpose of the present invention is to provide an ultrasonic vibrator that has a much longer lifespan than conventional ultrasonic diaphragms and vibrating members.

[Means for Solving the Problems] In order to achieve the above object, the ultrasonic transducer of the present invention has the following features:
In an ultrasonic vibrator equipped with a vibrating member such as an ultrasonic diaphragm for ultrasonic cleaning or a vibrating member such as a tool for ultrasonic machining at the tip, a stellite layer is formed on the ultrasonic vibration surface of the ultrasonic diaphragm or the vibrating member. Alternatively, the entire surface of the ultrasonic diaphragm or vibrating member is formed of stellite.

[Function] According to the ultrasonic vibrator of the present invention having the above configuration, the ultrasonic vibrator or vibrating member at the tip of the ultrasonic vibrator can be immersed in a liquid to vibrate ultrasonically, and objects to be welded can be welded. Even when using ultrasonic vibrations to achieve this, Stellite's corrosion and abrasion resistance greatly extends its lifespan.

[Example] Hereinafter, examples embodying the present invention will be described with reference to the drawings.

Fig. 2 shows an embodiment of a tool for ultrasonic machining, and in the figure, the tool l has a structure in which a small-diameter cylindrical part tb extends toward the distal end from the center of the distal end surface of a cylindrical rod 1a. ,
It is integrally formed using alloy steel. And the tool
At the tip (ultrasonic vibration surface) of (small diameter cylindrical part lb),
A stellite layer 2 with a thickness of 2 mm is provided, and this stellite layer 2 is interposed by welding and overlaying a metal material 3 having intermediate properties between stellite and metal steel at the tip. It is formed by welding overlay on the tip surface of the tool 1. As is well known, Stellite is an alloy made of cobalt with the addition of chromium, tungsten, etc., and is used as a material for internal combustion engine valves and cutting blades due to its excellent wear resistance. The inventor of the present invention found that this stellite is extremely effective as a material for the tip of an ultrasonic vibrating tool, and therefore used it in the ultrasonic machining tool 1 as described above. Note that the tool 1 is normally attached to the tip of the ultrasonic transducer 4 (FIG. 1) and used.

Further, the thickness of the stellite layer 2 and the material of the tool 1 described above are merely examples, and are not intended to be limiting.

Here, the results of an experiment to confirm the effects of the tool 1 of the above embodiment will be described below.

FIG. 1 is an overall front view of the experimental apparatus used to test the effectiveness of tool 1. As shown in the figure, in the ultrasonic vibration system of this device, an amplification pawn 5 for increasing the amplitude of the tool 1 is connected between an ultrasonic vibrator 4 and the tool 1.

This horn 5 has almost the same shape as the tool 1,
A flange (not shown) protrudes at approximately the middle position,
This flange is sandwiched between a pair of flange supports 6 and fixed with bolts. And the flange support 6
is attached to the experimental aquarium ti. The ultrasonic vibrator 4 is connected to an ultrasonic oscillator 8 by an output cable 7, the oscillator 8 drives the ultrasonic vibrator 4, and the amplitude obtained by the ultrasonic vibrator 4 is amplified by the horn 5. As a result, the tip surface (Stellite layer 2) of the tool 1 vibrates ultrasonically. In the figure, numeral 9 is a power outlet, and 10 is a power cable.

Further, water A for certain insects is poured into the aquarium 1l, and a lid 12 having an opening 122L in the center is attached to the upper end thereof.

In this experiment, the tool l was inserted into the opening 1 of the lid body 12.
2a into the water tank 1L, the flange support 6 of the horn 5 was brought into contact with the upper surface of the lid 12, and the tip (Stellite layer 2) of the tool 1 was completely immersed in the water A.

This experiment was conducted under the following conditions.

Ultrasonic frequency: 20 kHz, amplitude at the tip of tool 1: 40μ shoulder, immersion depth at the tip of tool 1: 16xm,
Ultrasonic vibration time: lsec-ON, 3sec-OF
A test was conducted for 60 hours at cycle F (actually 15 hours of continuous vibration).

For comparison purposes, a similar experiment was conducted by attaching a conventional tool without the stellite layer 2 to the tip of the pawn 5 instead of the tool 1.

The experimental results showed that in the tool 1 of the present invention, no erosion occurred as shown in Fig. 3 even after a 60-hour test, whereas in the conventional tool, erosion did not occur as shown in Figs. 6 and 7. The occurrence was very severe. The tool 1 of the present invention was further tested for 500 hours (continuous vibration for 125 hours). As a result, no erosion was observed as shown in FIGS. 4 and 5. In addition, FIGS. 3 to 5 are photographs of the tip surface of the stellite layer 2 regarding the tool 1 of the present invention. FIG. 3 is a photograph at double magnification after a 60-hour test, and FIG. 4 is a photograph after a 500-hour test. A photograph with a magnification of 2x and FIG. 5 is a photograph with a magnification of 100x taken by a scanning electron microscope after a 500 hour test. Figures 6 and 7 are photographs of the tip surface of a conventional tool. Figure 6 is a photograph at double magnification after a 60-hour test, and Figure 7 is a magnification taken using a scanning electron microscope after a 60-hour test. 10
This is a 0x photo.

By the way, the present invention is not limited to the above embodiments, and for example, regarding ultrasonic diaphragms for ultrasonic cleaning,
If a stellite layer is provided on the surface, similar effects can be achieved, as well as chemical industry applications such as ultrasonic homogenizers based on the dispersion and emulsification effect of ultrasonic waves, and ultrasonic agglomeration devices that aggregate dispersed fine particles in liquid. It is possible to apply it to Further, instead of providing the stellite layer on the surface of the tool or vibration plate, the entire surface of the tool or diaphragm may be formed of stellite. Furthermore,
When welding plastics with an ultrasonic welder, wear resistance is required between the horn and the welded material (plastic), and the application can be changed as desired without departing from the spirit of the invention. It is also possible.

[Effects of the Invention] As is clear from the detailed description above, the ultrasonic vibrator of the present invention suppresses cavitation that occurs during ultrasonic vibration on the tip surface of an ultrasonic machining tool, the diaphragm of an ultrasonic cleaning machine, etc. The occurrence of erosion and the like due to such effects is greatly reduced, the deterioration of the ultrasonic vibration surface is suppressed, and the lifespan can be significantly extended, which is an excellent effect.

[Brief explanation of the drawing]

Fig. 1 is an overall front view of the experimental equipment used to test the effects of the ultrasonic transducer of the present invention, and Fig. 2 is an illustration of an ultrasonic machining tool attached to the tip of the ultrasonic transducer of the present invention. It is a front view showing an example. All of Figures 3 to 5 are photographs of the tip surface of the stellite layer 2 regarding the tool 1 of the present invention. Figure 3 is a photograph at double magnification after a 60-hour test, and Figure 4 is a photograph at 500
A photograph at 2x magnification after the time test, and FIG. 5 is a photograph at 100x magnification taken by a scanning electron microscope after the 500 hour test. Figures 6 and 7 are photographs of the tip surface of a conventional tool. Figure 6 is a photograph at double magnification after a 60-hour test, and Figure 7 is a magnification taken using a scanning electron microscope after a 60-hour test. This is a 100x photo. l...Ultrasonic processing tool, 2...Stellite layer, 4
... Ultrasonic transducer, 5... Horn for amplitude amplification, 6.
Flange support, 8... Ultrasonic oscillator. Figure 2 Lead Figure 3

Claims (1)

[Claims] In an ultrasonic vibrator equipped with a vibrating member such as an ultrasonic diaphragm for ultrasonic cleaning or a vibrating member such as a tool for ultrasonic machining at the tip, a stellite layer is formed on the ultrasonic vibration surface of the ultrasonic diaphragm or the vibrating member. An ultrasonic vibrator characterized in that the ultrasonic diaphragm or the vibrating member is entirely formed of stellite.