JPS6130367A - Connection mechanism for supersonic-wave working tool - Google Patents

Abstract

PURPOSE:To permit the supersonic-wave work with high accuracy by inserting a vibration-ampliude increasing horn having a tool fitting part and the expanded slot part continuous to the tool fitting part into a resonance body having the length in an integer times of 1/4-1/2 wave length of the applied supersonic-wave and allowing the axis center of a tool and the axis center of the horn to coincide with each other with high accuracy. CONSTITUTION:A vibration-amplitude increasing horn 5 has the length in an integer times of the half-wave length of the applied supersonic wave, and a hole 7 for the insertion of the shaft part of a supersonic-wave working tool 6 having the length in an integer times of the half-wavelength of the applied supersonic-wave length is formed at the top edge part, and four expanded-slot part 8 continuous to the hole 7 are formed in the direction of axis center at an interval of 90 deg.. Further, a tapered surface part 9 is formed onto the outer peripheral side at the top edge of the horn 5. A resonance body 10 has the length in an integer times of the 1/4-1/2 wave length of the applied supersonic wave, and the horn 5 is inserted into the body 10 and set through the fastening for the tapered surface. Therefore, since the tool 6 can be installed onto the horn 5, allowing the both axis centers to coincide with each other with high accuracy, supersonic-wave working with high accuracy can be carried-out efficiently.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is concerned with the accuracy of the mounting axis of an ultrasonic machining tool, such as when performing ultrasonic machining work while rotating the ultrasonic machining tool. This article relates to a coupling mechanism for ultrasonic machining tools suitable for cases where precision is required.

[Prior art and its problems]

Conventionally, as a method of attaching an ultrasonic machining tool to a vibration amplitude amplifying horn, a screw hole is formed at the tip of the vibration amplitude amplifying horn, and a screw shaft is screwed into the screw hole in the ultrasonic machining tool. There is a method in which the ultrasonic machining tool is screwed and coupled to the vibration amplitude amplifying horn.

However, with such means, if the ultrasonic machining tool is, for example, a ring-shaped tool, and the ultrasonic machining tool rotates around its axis during ultrasonic machining work, the ultrasonic Although it is strongly required that the axial center of the machining tool and the axial center of the vibration amplitude amplifying horn match with high precision, it is difficult to improve this axial center precision, and therefore ultrasonic machining is highly accurate. The disadvantage is that it cannot be done efficiently.

[Means for solving problems]

comprising a tool insertion part and a split groove body connected to the tool insertion part, the vibration amplitude enlarging horn is fitted to the resonator,
The structure is such that the vibration amplitude enlarging horn is tightened with a close tightening pressure during fitting, and the ultrasonic machining tool inserted into the tool insertion portion is attached to the vibration amplitude enlarging horn.

[Embodiment 1] FIG. 1 is a cross-sectional explanatory view of one embodiment of a coupling mechanism for an ultrasonic machining tool according to the present invention.

In the figure, 1 is a vibrator, 2 is a casing such as a vibrator, 3 is a housing, 4 is a cone, and 5 is an integer multiple of 10 wavelengths of the applied ultrasonic wave, for example, a vibration amplitude amplification device with a length equivalent to 10 wavelengths. A hole 7 is formed at the tip of the horn 5 for inserting the shaft of an ultrasonic machining tool 6 whose total length is an integral multiple of the ten wavelengths of the applied ultrasonic waves, for example, ten wavelengths. Furthermore, four groove portions 8 connected to the hole 7 are formed at 90° intervals in the axial direction or in a spiral shape.

The hole 7 is formed deep to the vicinity of the rearmost part of the horn 5, and the groove part 8 is formed from the tip of the horn to the node position of approximately 10 wavelengths of rotor vibration. .

Furthermore, a tapered surface portion 9 is provided on the outer peripheral side of the tip of the horn 5.
is formed.

Reference numeral 10 denotes a resonator having a length corresponding to 10 wavelengths of the applied ultrasonic waves or an integral multiple of 10 wavelengths, for example, 10 wavelengths, and a substantially truncated conical cylindrical cross section, and the horn 5 is fitted into this resonator 10. The resonator 10 is constructed so that the inner surface of the tip of the resonator 10 tightens the Chi-Me surface portion 9 of the tip of the horn 5 when the resonator 10 is fitted.

Similarly, this tightening is sometimes performed so that the contact length in the axial direction at the contact portion between the tapered surface portion 9 at the tip of the horn 5 and the resonator 10 is less than about 0.07 times the wavelength of the applied ultrasound, more preferably about 0. In terms of vibration characteristics, it is desirable to configure the length of the tapered surface portion 9 to be 0.05 to 0.063 mm.

The contact portion of the flange portion 11 with the casing 2 is formed with, for example, a screw, and by rotating the resonator 10, the resonator 10 moves in the vertical direction in FIG.
The tip of the horn 5 is tightened by the upward movement of the horn 5.

The ultrasonic machining tool coupling mechanism configured as described above uses a resonator 10 as a means for reducing the hole diameter at the tip of the horn 5 in order to connect the ultrasonic machining tool 6 to the horn 5.
The resonator 10 is set to have a length equivalent to 10 wavelengths of the applied ultrasonic wave or an integral multiple of 10 wavelengths, for example, 10 wavelengths, so that the resonant state does not occur. is maintained, and ultrasonic force machining work can be carried out efficiently without deterioration of vibration characteristics. That is, the length of the resonator 10 serving as a means for tightening the horn 5 is not arbitrary, but must be equivalent to ten wavelengths or an integral multiple of ten wavelengths.

Furthermore, when tightening the horn 5, the contact between the horn 5 and the resonator 10 is only at the tip, and this contact length is approximately 0.07 times or less than the wavelength of the applied ultrasound, more preferably approximately 0.05. It is desirable that it be about 0.063 times as large. By configuring the horn 5 and the resonator 10 so that they are in contact with each other over almost their entire length, the horn 5 and the resonator 10 vibrate in unison. As a result, the resonance condition is maintained well, and the efficiency of ultrasonic machining work is improved accordingly.

・For the same reason, it is more preferable that the ultrasonic machining tool 6 inserted into the hole 7 of the horn 5 and the horn 5 have a wavelength of about 0.07 times or less of the applied ultrasonic wave at the tip of the horn 5. It is desirable that the contact is within a range of about 0.05 to 0.063 times.

'Also, according to such a coupling means, the ultrasonic machining tool 6 can be easily attached to the horn 5 so that the axis of the ultrasonic machining tool and the axis of the horn coincide with each other with high precision. Therefore, from this point of view as well, ultrasonic machining can be carried out with high precision and efficiency.

[Embodiment 2] FIG. 2 is an explanatory view of the main parts of another embodiment of the coupling mechanism for an ultrasonic machining tool according to the present invention.

The coupling mechanism of this embodiment is basically the same as that of the previous embodiment, except that the reed, the flange portion 11 of the resonator 10, and the insertion port side of the hole 7 of the horn 5 are slightly different. be.

In other words, regardless of the ultrasonic machining tool 6, the contact between the ultrasonic machining tool 6 and the horn 5 is always only at the tip of the horn, and the contact length is approximately 0 of the wavelength of the applied ultrasonic wave.
．． A protrusion 7' is provided at the bottom of the hole 7 of the horn 5 so that the entrance diameter is smaller than the inner diameter so that the diameter is 0.07 times or less, more preferably about 0.05 to 0.063 times. be.

Further, a screw is not provided in the contact portion between the flange portion 11 and the casing 2, and a return spring lla is provided on the back side of the flange portion 11.
At the same time, the ring nasol l-, 11C pushes up the resonator 10 through the bearing llb, and the horn 5
The structure is such that the ultrasonic machining tool 6 can be coupled to the horn 5 by tightening the horn.

Similarly, as shown in FIG. 3, a split ring 12a and a disc spring 12b may be provided between the ring nut 11C and the flange portion 11.

Further, a convex taper portion may be provided at the contact portion between the horn 5 and the resonator 10, or a convex taper portion may be provided only on the resonator 10 side. .

〔effect〕

Ultrasonic e711] The axial center of the tool and the axial center of the horn are installed so that they match with high precision, allowing ultrasonic skin machining to be carried out with high precision and efficiency.

In addition, since the resonator for attaching the ultrasonic machining tool has a length equivalent to 10 wavelengths of the applied ultrasonic waves or an integral multiple of 10 wavelengths, ultrasonic machining can be performed without deteriorating the vibration characteristics of the horn itself. Able to work efficiently.

[Brief explanation of drawings]

FIGS. 1 to 3 are explanatory diagrams of embodiments of a coupling mechanism for an ultrasonic machining tool according to the present invention. 5... Horn (horn for expanding vibration amplitude), 6... Tool for ultrasonic machining, 7... Hole (tool insertion part), 8... Divided groove part, 9... Tapered surface part, 10... Resonance body.

Claims (1)

[Claims] A vibration amplitude amplifying horn configured with a tool insertion part and a groove part connected to the tool insertion part, and a resonator having a length equivalent to about 1/4 wavelength or an integral multiple of 1/2 wavelength of the applied ultrasonic wave. , Fit the vibration amplitude expansion horn to the resonator, tighten the vibration amplitude expansion horn with tight tightening pressure during fitting, and insert the ultrasonic machining tool inserted into the tool insertion part into the vibration amplitude expansion horn. A coupling mechanism for an ultrasonic machining tool, characterized in that it is configured to be attached to a horn.