JPH02212097A - Rotating circular cutting edge by ultrasonic vibration - Google Patents

Abstract

PURPOSE:To reduce the stress exerted on a circular cutting edge and to almost eliminate the danger of heating, fatigue and damage by the stress, by making the fitting position of the circular cutting edge at the position where stress is minimized in the stress distribution of a horn. CONSTITUTION:A stress distribution is found by calculation based on the material, diameter, length and exciting vibration frequency of horns 3, 4. A circular cutting edge 2 is fitted to the position where the stress is minimized in the stress distribution thus found. Consequently the stress applied on the circular cutting edge 2 is reduced.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a method for attaching a horn to an ultrasonic vibrator, attaching a round blade to the horn, and applying ultrasonic vibration to the round blade while This invention relates to improvements in the round blade attachment of an ultrasonic vibration rotary round blade that rotates the entire round blade.

(Prior Art) Fig. 2(a) is a structural diagram of a conventional ultrasonic vibration rotary round blade, and Fig. 2(b) is a diagram showing stress distribution in the horn due to ultrasonic vibration of the rotary round blade. It is.

An enlarged horn 7 is coupled to the ultrasonic vibrator 6 to enlarge the amplitude of the ultrasonic vibration, and a horn 3 is further coupled to the horn 3, and a circular blade 2 is fixed to the tip thereof by a fixing screw 1'. Then, the ultrasonic vibrator 6, the enlarged horn 7, the horn 3, and the round blade 2 rotate integrally around the rotation 111111.

When ultrasonic vibration is applied, the stress distribution beyond the horn 3 is approximately as shown by the stress distribution curve 9' in FIG. 2(b). The horizontal axis represents the magnitude of stress, and the vertical axis represents a position corresponding to the position in the direction of the rotation axis in Figure (a).

The joint portion 12 between the enlarged horn 7 and the horn 3 is designed at a place where stress is least. Further, since there is no structure at the tip of the fixing screw 1' and there is only air, the stress is also close to zero.

Note that the vibration mode is as shown by a vibration mode curve 10', the amplitude is the minimum where the stress is maximum, and the amplitude 5111 is the maximum where the stress is the minimum.

(Problem to be Solved by the Invention) By the way, looking at the stress distribution curve 9' in FIG. 2(b), a stress of a magnitude P is applied at the position of the round blade 2.

Therefore, heat generation and fatigue occur due to stress on the mounting portion of the round blade 2, and there is a risk that the round blade may be damaged.

SUMMARY OF THE INVENTION In view of the above conventional problems, an object of the present invention is to provide an ultrasonic vibration rotary round blade in which the stress applied to the round blade is reduced by devising the mounting position of the round blade.

(Means for Solving the Problems) The present invention has the following means configuration to achieve the above object.

That is, the ultrasonic vibrating rotary round blade of the present invention is a rotary round blade in which a horn is attached to an ultrasonic vibrator, a round blade is attached to the horn, and the ultrasonic vibrator and the horn are rotated to rotate the round blade. The round blade is mounted at a position in the direction of the horn's rotational axis at a position where stress is minimized in the stress distribution of the horn due to ultrasonic vibration.

(for production) The action will be described below.

Once the material, diameter, length, and vibration frequency of the horn are determined, the stress distribution can be calculated.6 In the present invention, the round blade is attached at the position where the stress is minimized in the stress distribution thus determined. Naturally, the stress applied to the round blade is also reduced. In this way, an ultrasonic vibration rotary round blade with low stress applied to the round blade is obtained.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1(a) is a structural diagram of an embodiment of the present invention, and FIG. 1(b) is a diagram showing stress distribution in the embodiment of FIG. 1(a).

The difference from FIG. 2 is that a horn 4 is also connected to the horn 3 on the round blade 2 by means of a connecting screw 1 so as to sandwich the round blade 2 therebetween. The horn 4 is made of the same material and has the same diameter as the horn 3.

The stress distribution of the ultrasonic vibration in this case is as shown by the stress distribution curve 9 in Figure (b). At the joint 12 between the horn 3 and the enlarged horn 7, it is at its minimum as in the case of FIG. .

The vibration mode is as shown in the vibration mode curve 10, and the amplitude is maximum where the stress is minimum, and the amplitude is minimum where the stress is maximum.

In this embodiment, the round blade is attached at a position where the stress is minimized in the stress distribution of the horns, which are made of the same material and have the same diameter.

In this embodiment, the round blade is attached between the horns 3 and 4, but one of the horns 3 and 4 and the round blade are manufactured as an integral structure, and the other one is connected with a screw. They may be combined, a round blade may be attached to the middle of one horn having the combined length of horns 3 and 4, or they may be manufactured as an integral structure.

(Effects of the Invention) As explained above, in the ultrasonic vibrating round blade of the present invention, the stress applied to the round blade is reduced by setting the mounting position of the round blade at a position where the stress is minimized in the stress distribution of the horn. It has the advantage that there is almost no risk of heat generation, fatigue, or damage due to stress.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the structure and stress distribution of an embodiment of the present invention, and FIG. 2 is a diagram showing the structure and stress distribution of a conventional ultrasonic vibration rotary round blade. 1...Connection screw, 1'...π fixed screw, 2...Round blade, 3, 4...Horn, 6... Ultrasonic transducer, 7...
・Enlarged horn, 9.9'... Stress distribution curve,
10.10'... Vibration mode curve, 11...
...Rotating axis, 12...Joint part. Agent Patent Attorney Hirocha Hachiman / Diagram (a) (b) No.? Figure (V (b)

Claims (1)

[Claims] In a rotary round blade in which a horn is attached to an ultrasonic vibrator and a round blade is attached to the horn and the ultrasonic vibrator and horn rotate together, the round blade is rotated. An ultrasonic vibrating rotary round blade characterized by a position where stress is minimized in the stress distribution of the horn due to sonic vibration.