JPH06297303A - Ultrasonic machining head - Google Patents

Abstract

PURPOSE:To produce stable ultrasonic waves, even if the turning spindle fitted with a tool is rotated at high speed. CONSTITUTION:An exciting core 5 provided with an exciting coil 7 in its inside groove 5a is provided on the inner circumferential surface of a supporting cylinder 1, and a magnetostrictive vibrator 6 is embedded in the outer circumference of a turning spindle 3 in the position opposite to the exciting core 5, so that magnetostriction can be caused by the magnetic field produced by the exciting core 5, and a tool 9 can be vertically vibrated by the ultrasonic waves produced by the magetostriction.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an ultrasonic machining head.

[0002]

2. Description of the Related Art A conventional ultrasonic machining head for ultrasonic machining in which a machining liquid containing fine abrasive grains is put between a tool and a work, and ultrasonic vibration is applied to the tool under a light pressure. The structure of FIG. 3 is shown in FIG. 3, and the structure of the main part is shown in FIG.

As shown in the figure, a rotary shaft 23 supported by a support cylinder 21 via bearings 22a and 22b is rotated by a motor 24.

The slip ring 25 provided on the upper part of the rotary shaft 23 is in contact with the brush 26 electrically connected to a high frequency transmitter (not shown), and even if the rotary shaft 23 rotates, the slip ring 25 and the brush 26 is always electrically connected.

An exciting coil 28 electrically connected to the slip ring 25 is wound around a magnetostrictive oscillator 27 provided inside the rotating shaft 23, and the magnetostrictive oscillator 27 is operated by a magnetic field generated by the exciting coil 28. , Causes magnetostriction and generates ultrasonic waves.

A tool 30 attached to the tip end side of the rotary shaft 23 via a horn 29 vibrates in the vertical direction by the ultrasonic waves generated by the magnetostrictive vibrator 27.

From the tip end side of the tool 30, the working liquid 101 fed from the supply hole 31a of the seal portion 31 provided on the rotary shaft 23 flows out through the flow passage 32.

Therefore, the rotating shaft 23 is rotated by the motor 24, and electricity is applied to the exciting coil 28 by the high-frequency oscillator to generate ultrasonic waves from the magnetostrictive vibrator 27, so that the tool 30 is rotated in the circumferential direction and vertically. And the machining liquid 1
01 is fed from the supply hole 31a to the tip side of the tool 30 to process the work.

[0009]

In such a conventional ultrasonic processing head, when the rotary shaft 23 rotates at high speed,
The brush 26 is abraded so much that contact failure occurs between the slip ring 25 and the brush 26, making it difficult to stably generate ultrasonic waves. Therefore, maintenance and management such as inspection and replacement of the brush 26 must be frequently performed. Further, the slip ring 25 is attached to the rotary shaft 2.
3, the rotating shaft 23 becomes large.

[0010]

In order to solve the above-mentioned problems, the present invention provides a rotary shaft to which a tool is attached on the tip side, a support for rotatably supporting the rotary shaft, and a rotary shaft provided on the rotary shaft. And a magnetostrictive oscillator for applying ultrasonic vibration to the tool, an exciting core provided on the support so as to have a predetermined distance from the magnetostrictive oscillator, and an exciting core for applying a magnetic field to the magnetostrictive oscillator, and provided on the exciting core. And an exciting coil for generating a magnetic field is provided in the exciting core to configure an ultrasonic machining head.

[0011]

In the ultrasonic machining head having the above-described structure, when electricity is applied to the exciting coil, a magnetic field is generated in the exciting core, and the rotating magnetostrictive vibrator causes magnetostriction in a non-contact manner to generate ultrasonic waves. The tool vibrates vertically.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an ultrasonic machining head according to the present invention will be described with reference to the drawings. Note that FIG. 1 shows the structure, and FIG. 2 shows a schematic configuration of the main part.

As shown in FIG. 1, a rotary shaft 3 is rotatably provided inside a cylindrical support cylinder 1 via bearings 2a and 2b coaxially with the support cylinder 1. A motor 4 for rotating the rotating shaft 3 around the shaft is provided at the upper end of the rotating shaft 3.

Between the support cylinder 1 and the rotary shaft 3, an annular excitation core 5 having a concave groove portion 5a formed on the inner peripheral surface side is coaxial with the rotary shaft 3 and the inner peripheral surface of the support cylinder 1. Is attached to. An annular magnetostrictive oscillator 6 coaxial with the rotating shaft 3 is embedded in the rotating shaft 3 on the inner peripheral side facing the exciting core 5. An exciting coil 7 electrically connected to a high-frequency oscillator (not shown) is provided in the groove 5a of the exciting core 5 with the rotating shaft 3
It is installed so as to be coaxial with.

Therefore, as shown in FIG. 2, the exciting coil 7
When electricity is applied to the excitation core 5 by a high-frequency oscillator, a magnetic field corresponding to the high-frequency current is generated in the exciting core 5, and the magnetostrictive vibrator 6 causes magnetostriction in response to the magnetic field to generate ultrasonic waves. .

That is, the exciting core 5 fixed to the rotating magnetostrictive vibrator 6 generates ultrasonic waves in a non-contact manner.

A magnetostrictive vibrator 6 is provided on the lower end side of the rotating shaft 3.
A horn 8 is attached to resonate and expand the ultrasonic waves from the. A tool 9 is provided at the lower end of the horn 8.

Below the rotary shaft 3, a seal portion 10 having a supply hole 10a for supplying the working liquid 101 is attached. Machining liquid 10 supplied from this supply hole 10a
1 flows out from the tip of the tool 9 through the flow path 11 formed in the horn 8 and the tool 9 below the rotary shaft 3.

In order to machine a work with the ultrasonic machining head having such a structure, the motor 4 is driven to rotate the rotary shaft 3, and electricity is applied to the exciting coil 7 by a high frequency oscillator to rotate the magnetostrictive vibration. Ultrasonic waves are generated in the child 6 in a non-contact manner, and the tool 9 is vibrated vertically while rotating in the circumferential direction.

Then, the working liquid 101 is fed from the supply hole 10a and is fed from the tip of the tool 9 while the tool 9 is being fed.
To process the work.

In this embodiment, the bearings 2a, 2
Although the exciting core 5, the magnetostrictive vibrator 6, and the exciting coil 7 are provided so as to be located between b, for example, they may be provided between the bearing 2a and the motor 4 or between the bearing 2b and the horn 10. If the magnetostrictive oscillator is provided on the horn and the exciting core and the exciting coil are provided so as to apply a magnetic field to the magnetostrictive oscillator, the same effect can be obtained.

[0022]

In the ultrasonic machining head according to the present invention, the magnetostriction vibrator provided on the rotary shaft causes magnetostriction in a non-contact manner by the exciting core to generate ultrasonic waves. It is no longer necessary and the brush inspection
Exchange can be eliminated and stable ultrasonic waves can be generated during high speed rotation of the rotating shaft. In addition, the ultrasonic processing head becomes smaller and lighter.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of an ultrasonic machining head according to the present invention.

FIG. 2 is a schematic configuration diagram of a main part thereof.

FIG. 3 is a vertical sectional view of a conventional ultrasonic processing head.

FIG. 4 is a schematic configuration diagram of a main part thereof.

[Explanation of symbols]

 1 Support tube 3 Rotating shaft 5 Excitation core 6 Magnetostrictive vibrator 7 Excitation coil 9 Tool

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tateo Tanimoto 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries Ltd. Hiroshima Research Laboratory

Claims (1)

[Claims] 1. A rotary shaft to which a tool is attached on the tip side, a support for rotatably supporting the rotary shaft, a magnetostrictive oscillator provided on the rotary shaft and for applying ultrasonic vibration to the tool, An exciting core provided on the support so as to be at a predetermined distance from the magnetostrictive oscillator and providing a magnetic field to the magnetostrictive oscillator, and an exciting coil provided on the exciting core and generating a magnetic field at the exciting core are provided. Ultrasonic processing head characterized by that.