JP2022131687A - Ultrasonic machining device - Google Patents

Abstract

To provide an ultrasonic machining device which allows manufacturing costs to be suppressed as various types of boring bars conforming to the ISO standards, that are manufactured and sold by various cutting tool manufacturers, can be easily mounted thereto and removed therefrom, and further, with which an optimal resonance state can be obtained by adjusting the projected length of a boring bar in accordance with a frequency of ultrasonic vibration excited using an ultrasonic vibration part.SOLUTION: An ultrasonic machining device 1 includes: a hollow ultrasonic vibration part 20 having an insertion port 21; an ultrasonic transducer 30 to be connected to the ultrasonic vibration part 20; and a plurality of fixtures for fixing from the outside a sleeve 10 that stores and supports a boring bar or a boring bar B1 inserted through the insertion port 21. The ultrasonic vibration part 20 has multiple holes 22 to which the plurality of fixtures are inserted respectively.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to an ultrasonic processing apparatus that can be used for cutting by attaching various types of boring bars manufactured and sold by various cutting tool manufacturers according to ISO standards.

As one of the processing techniques, an ultrasonic processing technique that applies ultrasonic vibration is used. For example, as a conventional ultrasonic machining technology, a high-hardness cutting edge is directly brazed to an ultrasonic vibrating part (ultrasonic oscillator) that performs ultrasonic vibration, or an insert tip is mounted to perform ultrasonic cutting. There is technology to do

Also, there is known a technique of designing an ultrasonic processing apparatus in accordance with the wavelength of ultrasonic vibration excited by an ultrasonic vibrating portion when ultrasonic cutting is performed. For example, in Patent Documents 1 and 2, in an ultrasonic processing apparatus in which a processing tool is attached to the tip of a horn and supported on one side, the longitudinal vibration of the ultrasonic transducer and the radial elongation vibration of the processing tool are in a clean resonance state. An ultrasonic processing apparatus capable of

JP 2011-143517 A Japanese Unexamined Patent Application Publication No. 2011-110670

However, with the ultrasonic machining apparatuses described in Patent Documents 1 and 2, it is necessary to calculate the wavelength of ultrasonic vibration and the like for each part to be machined, and to design and manufacture a cutting tool each time. In addition, even if the length of commercially available boring bars is the same, the speed at which ultrasonic vibrations travel (propagation velocity) differs depending on the material, such as iron or stainless steel, so the wavelength also varies. Therefore, when the ultrasonic processing apparatuses described in Patent Documents 1 and 2 are used, the manufacturing cost inevitably increases due to individual design and manufacturing, and the frequency of ultrasonic vibration excited by the ultrasonic vibration part There is a problem that it is difficult to achieve a clean resonance state in accordance with the

Therefore, according to the present invention, it is possible to easily attach and detach various types of boring bars according to ISO standards, which are manufactured and sold by various cutting tool manufacturers, so that manufacturing costs can be reduced. In addition, it is possible to adjust the protruding length of the boring bar according to the frequency of the ultrasonic vibration excited by the ultrasonic vibration part, and to obtain the optimum resonance state. aim.

The ultrasonic processing apparatus of the present invention stores a hollow ultrasonic vibrator having an insertion port, an ultrasonic vibrator connected to the ultrasonic vibrator, and a boring bar or a boring bar inserted through the insertion port. and a plurality of fixtures for externally fixing the supporting sleeve, and the ultrasonic vibrator has a plurality of holes into which the plurality of fixtures are respectively inserted.

As a result, the boring bar or sleeve inserted through the insertion port is externally fixed by the fixture via the hole at an arbitrary position within the ultrasonic vibrator.

Moreover, it is preferable that the ultrasonic processing apparatus includes a pipe connected to the hole provided in the ultrasonic vibration part, and a feeding device for feeding gas into the ultrasonic vibration part via the pipe. As a result, the gas delivered (jetted) by the delivery device is delivered into the ultrasonic vibration section through the pipe and the hole provided in the ultrasonic vibration section.

(1) According to the ultrasonic processing apparatus of the present invention, a hollow ultrasonic vibrator having an insertion port, an ultrasonic vibrator connected to the ultrasonic vibrator, and a boring bar or boring inserted through the insertion port and a plurality of fixtures for externally fixing the sleeve that stores and supports the bar. The inserted boring bar or sleeve is fixed at an arbitrary position in the ultrasonic vibrator by means of a fixture from the outside through a hole. Various types of boring bars can be easily attached and detached, and the protrusion length of the boring bar can be adjusted according to the frequency of the ultrasonic vibration excited by the ultrasonic vibrating part to achieve the optimum resonance state. can be obtained.

(2) In addition, the ultrasonic processing apparatus has a structure including a pipe connected to a hole provided in the ultrasonic vibration part, and a feeding device for feeding gas into the ultrasonic vibration part through the pipe. , Since the gas delivered (sprayed) by the delivery device is sent into the ultrasonic vibrating part through the holes provided in the pipe and the ultrasonic vibrating part, the temperature rise in the ultrasonic vibrating part can be prevented. and, furthermore, the optimum resonance state can be maintained.

1 is a schematic perspective view of an ultrasonic processing apparatus according to an embodiment of the present invention; FIG. 1 is a schematic exploded view of an ultrasonic processing device according to an embodiment of the present invention; FIG. It is a figure for explaining a resonance state. FIG. 2 is a diagram for explaining an ultrasonic oscillator and a frequency counter according to an embodiment of the invention; FIG. FIG. 4 is a diagram for explaining an example of a boring bar and a tool holder used in an ultrasonic processing apparatus; It is a figure for demonstrating the example at the time of using the ultrasonic processing apparatus which concerns on embodiment of this invention.

Embodiments of the present invention will be described in detail below. is not limited to the contents of

[Ultrasonic processing equipment]
FIG. 1 is a schematic perspective view of an ultrasonic processing apparatus according to an embodiment of the invention. Moreover, FIG. 2 is a schematic exploded view of the ultrasonic processing apparatus according to the embodiment of the present invention. The ultrasonic processing apparatus 1 includes a sleeve 10, an ultrasonic vibrating portion 20 having a plurality of holes 22, an ultrasonic vibrator 30, a boring bar B, a bite shank portion 40, and a plurality of fixing portions inserted through the plurality of holes 22, respectively. including fittings (not shown).
Also, FIG. 4 is a diagram for explaining the ultrasonic oscillator and the frequency counter according to the embodiment of the present invention. The ultrasonic processing apparatus 1 is connected to an ultrasonic oscillator (ultrasonic power source) 60 .

The ultrasonic oscillator 60 is connected to a general power supply, converts the general power supply into a high-frequency voltage, and loads the piezoelectric element (piezo element) of the ultrasonic transducer 30 . The frequency of the ultrasonic waves oscillated from the ultrasonic oscillator 60 can be adjusted as appropriate. Oscillators are commercially available.

Here, the ultrasonic wave is energy that propagates the density of elastic bodies such as gases, liquids, and solids as compressional waves. Generally, it refers to a frequency of 20 kHz or higher in the high frequency range. Also, the frequency of the ultrasonic waves oscillated from the ultrasonic oscillator 60 can be measured by the frequency counter 70 . In addition, the ultrasonic oscillator 60 employs an automatic frequency tracking system that can suppress fluctuations in the frequency that vary slightly due to changes in temperature, power supply voltage, and the like.

The ultrasonic transducer 30 is connected to the ultrasonic oscillator 60 via the connection port 31 . It is also connected to the ultrasonic vibrator 20 . The ultrasonic vibrator 20 and the ultrasonic transducer 30 are detachable.
A piezoelectric element (piezo element) is incorporated in the ultrasonic transducer 30, and when a high-frequency voltage is applied from the ultrasonic oscillator 60, the piezoelectric element (piezo element) is converted into ultra-fine expansion and contraction, The ultrasonic vibration is transmitted to the ultrasonic vibrating section 20 by amplifying the ultrasonic micro vibration.

The ultrasonic vibrator 20 is hollow and has an insertion opening 21 into which the boring bar B is inserted. The ultrasonic vibrator 20 stores and supports the boring bar B inserted from the insertion port 21 . Further, the ultrasonic vibrator 20 is provided with a hole 22 into which a fixture (not shown) for fixing the inserted boring bar B is inserted in the side surface thereof. The hole 22 is provided through the side surface of the ultrasonic vibrator 20 to a hollow portion into which the boring bar B is inserted.

The setting tool is, for example, a screw or the like, and the boring bar B inserted into the ultrasonic vibrator 20 is fixed by being pressed by the screw or the like from the outside through the hole 22 . A plurality of holes 22 are provided on the side surface of the ultrasonic vibrator 20 . For example, FIG. 3 is a diagram for explaining the resonance state, and in the example shown in FIG.

The boring bar B is a cutting tool having a cutting edge (insert tip) at its tip. Boring bar B is, for example, a cutting tool commercially available (manufactured and sold) by Mitsubishi Materials Corporation, Kyocera Corporation, etc. Its size (thickness) is 6φ, 12φ, 16φ according to ISO standards. , or 20φ.
For example, the boring bar B1 is 6φ and the boring bar B2 is 12φ.

Here, if the size of the boring bar B1 is different from the size (diameter, 16φ in the example shown in FIG. A gap will occur. In such cases, the sleeve 10 is used to fill the gap.

The sleeve 10 is hollow and has an insertion opening 11 into which the boring bar B1 is inserted (see FIG. 2). In addition, the sleeve 10 has a plurality of fixing holes 12 for fixing the boring bar B1 inserted in the sleeve 10 from the outside with fixtures (not shown). A national fixture is, for example, a screw.

2, the boring bar B1 is inserted into the sleeve 10 through the insertion port 11 of the sleeve 10, and the ultrasonic vibrator 20 is inserted through the insertion port 21 of the ultrasonic vibrator. When the sleeve 10 is inserted into the sonic vibration part 20, the state of the schematic perspective view shown in FIG. 1 is obtained. In this case, the sleeve 10 inserted into the ultrasonic vibrator 20 is fixed by being pressed by a fixture (not shown) from the outside through the hole 22 .

Here, the size (thickness) of the sleeve 10 is the same as the diameter of the insertion port 21 (16φ in the example shown in FIG. 2). In other words, the sleeve 10 is for filling the gap caused by the difference between the diameter of the insertion opening 21 and the thickness of the boring bar B to be inserted into the insertion opening 21, and has the same thickness as the diameter of the insertion opening 21. be.

The bite shank part 40 has a sufficient mass and fixes the ultrasonic vibrating part 20 . When performing ultrasonic processing using the ultrasonic processing apparatus 1, the ultrasonic processing is performed with the tool shank portion 40 fixed by the fixing device 50 (see FIG. 6).

As described above, the ultrasonic processing apparatus according to the present embodiment has been described. It can be appropriately adjusted according to the size (thickness) of 12φ, 16φ, 20φ, or commercially available boring bars.

[Bowling bar]
FIG. 5 is a diagram for explaining examples of a boring bar and a tool holder used in an ultrasonic processing apparatus. The ultrasonic vibrating section 20 stores and supports boring bars B having various shapes as shown in FIGS. 5A and 5B in the ultrasonic vibrating section 20 as shown in FIG. be able to. In addition, the ultrasonic vibration unit 20 can store and support various shaped tool holders H connected to the boring bar B (B23, B24) as shown in FIGS. can.

For example, the boring bar B211 shown in FIG. 5A has the same thickness of the insertion portion (the portion inserted into the ultrasonic vibrator 20) and the thickness of other portions. On the other hand, in the boring bar B22 shown in FIG. 5(B), the thickness of the other portion is thinner than the thickness of the insertion portion.

Also, as shown in FIGS. 5(C) and (D), the tool holder H can be used by being connected to the boring bar B. FIG. For example, the tool holder H1 shown in FIG. 5(C) is welded and fixed to the boring bar B23, and is used by inserting the insertion portion of the boring bar B23 into the ultrasonic vibrator 20. As shown in FIG. On the other hand, the tool holder H2 shown in FIG. 5(D) is hollow, and a boring bar B24 is inserted and fixed in the hollow portion.

As shown in FIGS. 5(C) and 5(D), if the tool holder H and the boring bar B are in contact with each other at the plane F, ultrasonic waves can be transmitted to the tip of the tool holder H (cutting edge).

As shown in FIG. 5(E), the boring bar B and the like stored in the ultrasonic vibrator 20 are externally pressed by a fixture (not shown) inserted through the hole 22 at an arbitrary position. fixed. Therefore, when the boring bar B or the like is inserted to the deepest part of the hollow portion in the ultrasonic vibrator 20, it is possible to use all four holes 22 shown in FIG. If the boring bar B or the like is inserted up to the middle of the hollow portion in the ultrasonic vibrator 20, the left two of the four holes 22 shown in FIG. be able to.

In other words, since the depth (length) of insertion of the boring bar B or the like into the hollow portion of the ultrasonic vibrating section 20 can be freely adjusted, The protruding length of the boring bar B or the like can also be freely adjusted.
The depth of this hollow portion is ⅛ wavelength to ½ wavelength of the wavelength of the ultrasonic vibration excited by the ultrasonic transducer 30 . As a result, a safe and highly convenient ultrasonic processing apparatus 1 can be provided in which the protruding length of the boring bar B or the like can be adjusted widely and the boring bar B or the like does not come off from the ultrasonic vibrating section 20.例文帳に追加can provide.

In the present embodiment, the insertion opening 11 and the insertion opening 21 are circular (see FIG. 2). Or it can have other shapes. Correspondingly, the hollow portion of the sleeve 10 and the hollow portion of the ultrasonic vibrator 20 can also have a shape corresponding to the shape of the boring bar or sleeve to be appropriately inserted.

Also, when assembled, the positions of the fixing holes 12 of the sleeve 10 and the holes 22 of the ultrasonic vibrator 20 may overlap, and the fixing holes 12 and the holes 22 may be fixed by one fastener (for example, a screw). That is, the boring bar B1, the sleeve 10, and the ultrasonic vibrator 20 may be fixed to each other by screws inserted through the fixing holes 12 and 22.

Also, the boring bar B and the sleeve 10 may have a columnar shape or a polygonal shape. It may be planar.

[Cooling mechanism]
Further, the ultrasonic processing apparatus 1 includes, as a cooling mechanism, a pipe 81 connected to the hole 22 and a feeding device 80 for feeding gas into the ultrasonic vibrating section 20 via the pipe 81 (see FIG. 6). ).

The pipe 81 is a hose for sending the gas delivered (jetted) from the delivery device 80 into the ultrasonic vibrator 20 . The pipe 81 is connected to any one of the plurality of holes 22 provided. Alternatively, a plurality of pipes 81 may be provided to be connected to each of the plurality of holes 22 .
In the example shown in FIG. 6, tube 81 is connected to hole 22 using a connecting member (adapter). Various types of connection members, such as threaded joints and joint nuts, can be used according to the size and shape of the hole 22 and the pipe 81 and the application.

The feeding device 80 is a device for feeding gas into the ultrasonic vibrator 20 through the tube 81 . The gas is, for example, normal temperature air. Since gas is fed into the ultrasonic vibrating section 20 through the tube 81 by the feeding device 80, the inside of the ultrasonic vibrating section 20 is cooled. As the feeding device 80, for example, an air washing gun (air cleaning gun) or other device for feeding (jetting) air can be used.

[Operation of ultrasonic processing device]
The operation of the ultrasonic processing apparatus 1 will be described below with reference to each drawing. First, since the ultrasonic transducer 30 is supplied with power (high-frequency voltage) from the ultrasonic oscillator 60, the high-frequency voltage is applied to the piezoelectric element incorporated in the ultrasonic transducer 30, and the piezoelectric element undergoes ultra-slight expansion and contraction. The ultrasonic vibrations are transmitted to the ultrasonic vibrating section 20 by being converted and amplified into ultrasonic microvibrations.

In the present embodiment, the frequency of the ultrasonic vibration excited by the ultrasonic oscillator 30 can be appropriately selected from 20 kHz to 60 kHz according to the content of the processing work using the ultrasonic processing apparatus 1 and the object to be processed. can.

The ultrasonic vibrator 20 to which the ultrasonic vibrations are transmitted has a complex structure in which a large primary microvibration (Z-axis direction), secondary microvibration (X-axis direction) and tertiary microvibration (Y-axis direction) are superimposed. Perform micro-vibration.

The boring bar B receives displacement from the ultrasonic vibrator 20 through the sleeve 10, and finely vibrates along a complicated trajectory in which the Z-axis, X-axis, and Y-axis directions are superimposed depending on the shape and length.

This micro-vibration of the boring bar B is ultrasonic micro-vibration of 1 to 25 μm of the cutting edge of the boring bar B, and the vibration is repeated about 40,000 times per second. Therefore, even if the cutting edge collides with the machined surface to be machined, noise and plastic deformation do not occur, and a plurality of cracks occur on the machined surface. Then, the crack digs up the processing surface (cleavage occurs), and while being bitten into the processing object, the processing surface of the processing object is divided into chips, and cutting processing is performed by ultrasonic microvibration.

[Resonance state]
FIG. 3 is a diagram for explaining the resonance state. As shown in FIG. 3, when the boring bar B2 is inserted into the ultrasonic vibrating section 20 from the insertion opening 21, the length by which the boring bar B2 protrudes from the ultrasonic vibrating section 20 (protrusion length of the boring bar B2) L1 is a half wavelength (1/2λ) of the wavelength of the ultrasonic vibration λ excited by the ultrasonic transducer 30 . The length of the ultrasonic vibrator 20 is one wavelength (λ), and the total length of the ultrasonic vibrator 20 and the ultrasonic vibrator 30 is 3/2 wavelength (3/2λ).

In FIG. 3, the frequency of the ultrasonic vibrations oscillated by the ultrasonic oscillator 60 and excited by the ultrasonic transducer 30 is approximately 40 kHz, as indicated by the frequency counter 70 (see FIG. 4). The frequency counter 70 is "Type: FC-863" manufactured by Yokogawa Electric Corporation, and the ultrasonic oscillator 60 is manufactured by Duquesne (USA).

The propagation speed of ultrasonic waves in stainless steel, which is the material of the ultrasonic vibrator 20, is about 5,180 m/s in an individual. Therefore, the wavelength λ obtained by the formula (transmission speed)÷(frequency) is approximately 129.5 mm. That is, 1/2 wavelength (1/2λ) is approximately 64.75 cm.

In this manner, when the boring bar B2 is inserted into the ultrasonic vibration section 20 from the insertion port 21, the positioning is performed by the ultrasonic vibration section 20 so that the protrusion length L1 of the boring bar B2 is about 64.75 cm. be done. The positioning is performed by inserting a fixing tool such as a screw through the hole 22 after adjusting the projection length L1, and fixing the boring bar B2 by pressing it from the outside.

With such a configuration, the length L2 from the tip of the boring bar B2 (the portion in contact with the surface to be processed) to the end of the ultrasonic transducer 30 located in the opposite direction is an integral multiple (2λ) of the wavelength λ. Become. Therefore, the vibration of the ultrasonic transducer 30 in the Z-axis direction is in a clean resonance state, and efficient ultrasonic machining can be performed.

In the above description, the length of the ultrasonic vibrator 20 is one wavelength (λ), but it can be adjusted as appropriate. In particular, in order to realize efficient ultrasonic processing, it is desirable that the length of the ultrasonic vibrator 20 is one wavelength (λ) or longer.
Also, in the above description, the total length of the ultrasonic vibrator 20 and the ultrasonic transducer 30 is 3/2 wavelength (3/2λ), but this can also be adjusted as appropriate.

Here, when using a commercially available boring bar, the speed (propagation velocity) of ultrasonic vibrations varies depending on the material, such as iron or stainless steel, so that the wavelength also varies. In other words, since the density and bulk modulus differ depending on the boring bar, the propagation speed also differs, so the wavelength (=propagation speed/frequency) also varies. For example, the propagation speed of iron is approximately 5900 m/s, the propagation speed of copper is approximately 5000 m/s, and the speed of stainless steel is approximately 5600 m/s.

Therefore, even when commercially available boring bars of the same length are used, the protrusion length L1 that can achieve a clean resonance state differs depending on each boring bar. However, according to the ultrasonic processing apparatus 1 of the present invention, as described above, since the protrusion length L1 can be adjusted, even when using a commercially available boring bar, an optimum resonance state can be obtained. can. In other words, various types and lengths of boring bars conforming to the ISO standard can be easily attached and detached while adjusting the protrusion length L1 by fixing and removing fasteners such as screws.

Therefore, the ultrasonic processing apparatus 1 of the present invention can be used even with boring bars that are commercially available from cutting tool manufacturers, and can obtain an optimal resonance state, so it is not a clean resonance state. It is possible to prevent the occurrence of spoilage (defective products) that occurs in

In addition, recent frequency oscillators are equipped with a function that outputs an error (warning) and stops oscillation in order to protect the control circuit (to prevent the control circuit from overheating and breaking down) when it is not in a resonant state. ing. Therefore, it is possible to prevent a situation in which the frequency oscillator does not operate due to the non-resonant state, and cutting cannot be performed in the first place.

[Conventional manufacturing process]
In order to make the length from the tip of the boring bar to the end of the ultrasonic transducer located in the opposite direction an integral multiple of the wavelength λ (for example, 2λ), in the conventional manufacturing process, Fine adjustments were made while measuring the natural frequency, and adjustments were made based on empirical values.

Specifically, first, the sizes and materials of the boring bars and sleeves are drawn and designed, and the boring bars and sleeves are molded according to the drawings. Once the semi-finished product (prototype) is produced, the natural frequency is measured, and if necessary, the semi-finished product is processed for adjustment.

After that, quenching is performed, the natural frequency is measured here as well, processing is performed if necessary, and the natural frequency is finally adjusted. In particular, it is known in advance that the natural frequency will change at the time of quenching, so it is necessary to rely on the experience of engineers and factor in changes in the natural frequency due to quenching at the design stage. be.

Finally, grinding (polishing) with a grinding machine and attachment of the cutting edge (insert chip) are performed, the natural frequency is measured, and quality judgment is performed. In other words, as described above, the conventional manufacturing process relies on the experience of skilled engineers, frequently requires fine adjustment of the natural frequency, and requires a long manufacturing time. It cannot be said that the convenience is good because the manufacturing cost is high. In addition, many of the conventional ultrasonic processing apparatuses are so-called made-to-order products, which are manufactured as an integrated unit including a boring bar and a frequency vibrating unit, resulting in high manufacturing costs.

On the other hand, the ultrasonic processing apparatus 1 of the present invention can easily attach and detach various types of boring bars manufactured and sold by various cutting tool manufacturers according to ISO standards. , the manufacturing cost can be suppressed, and the projection length L1 of the boring bar B can be adjusted in accordance with the frequency of the ultrasonic vibration excited by the ultrasonic vibration part 20 to obtain an optimum resonance state. It is highly sensitive.

[Operation of cooling mechanism]
Further, in the ultrasonic processing apparatus 1, gas is fed into the ultrasonic vibration section 20 during cutting by the pipe 81 and the feeding device 80 described above. A rise in temperature can be prevented (see FIG. 6).

During cutting, heat is generated in the ultrasonic vibrating section 20 by ultrasonic vibration. When heat is generated and the temperature inside the ultrasonic vibrator 20 rises, a frequency (resonance frequency) blurring occurs, and the blurring occurs in the automatic tracking area of the automatic frequency tracking method employed in the ultrasonic oscillator 60. may be outside.

Therefore, by continuing to supply gas into the ultrasonic vibrator 20 during cutting, such heat generation can be suppressed and the ultrasonic amplitude at the cutting edge of the boring bar B can be kept within a certain range. As a result, a clean resonance state can be maintained continuously.

The embodiment described above is merely an example, and can be modified as appropriate without departing from the gist of the present invention. For example, holes 22 may be provided at three, five, or more locations. Also, the intervals between the holes 22 can be appropriately adjusted.

The present invention enables easy replacement of various types of boring bars conforming to ISO standards, which are commercially available from various cutting tool makers, so that manufacturing costs can be reduced and an optimum resonance state can be obtained. It is industrially useful because it can be used as a highly convenient ultrasonic processing apparatus capable of

1 Ultrasonic Processing Device 10 Sleeve 11 Insertion Port 12 Fixing Hole 20 Ultrasonic Vibrating Part 21 Insertion Port 22 Hole 30 Ultrasonic Transducer 31 Connection Port 40 Bit Shank Part 50 Fixing Device 60 Ultrasonic Oscillator (Ultrasonic Power Supply)
70 Frequency counter 80 Infeed device 81 Tube X, Y, Z Direction B, B1, B2, B211, B212, B22, B23, B24 Boring bar L1 Projection length of boring bar L2 Length H, H1, H2 Bite holder F Surface

Claims (7)

a hollow ultrasonic vibrator having an insertion port;
an ultrasonic vibrator connected to the ultrasonic vibrator;
a plurality of fixtures for externally fixing the boring bar inserted through the insertion opening or a sleeve that stores and supports the boring bar;
with
The ultrasonic vibration unit has a plurality of holes into which the plurality of fixtures are respectively inserted. The sleeve is for filling a gap caused by a difference between the diameter of the insertion opening and the diameter of the boring bar to be inserted into the insertion opening, and has the same thickness as the diameter of the insertion opening. 2. The ultrasonic processing apparatus according to 1. The hole is provided on a side surface of the ultrasonic vibrator,
3. The ultrasonic processing apparatus according to claim 1, wherein the fixture presses and fixes the boring bar or the sleeve inserted into the ultrasonic vibrator through the hole from the outside. a tube connected to the hole provided in the ultrasonic vibration unit;
a feeding device for feeding gas into the ultrasonic vibrator through the tube;
The ultrasonic processing apparatus according to any one of claims 1 to 3, comprising: 5. The ultrasonic processing apparatus according to any one of claims 1 to 4, wherein the length of said ultrasonic vibration part is equal to or greater than one wavelength of the ultrasonic vibration excited by said ultrasonic transducer. The depth from the insertion opening of the ultrasonic vibrating section to the end portion in the ultrasonic vibrating section is 1/8 wavelength to 1/2 wavelength of the wavelength of the ultrasonic vibration excited by the ultrasonic vibrator. The ultrasonic processing apparatus according to any one of claims 1 to 5. The ultrasonic processing apparatus according to any one of claims 1 to 6, wherein the ultrasonic vibration excited by said ultrasonic oscillator has a frequency of 28 kHz to 60 kHz.

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