JPH0785880B2 - Ultrasonic vibration rotary blade - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an ultrasonic vibrator, a horn attached to the ultrasonic vibrator, and a circular blade attached to the horn. The present invention relates to an improvement in mounting of a circular blade of an ultrasonic vibration rotating circular blade that rotates the entire circular blade.

(Prior Art) FIG. 2 (a) is a structural diagram of a conventional ultrasonic vibrating rotary blade, and FIG. 2 (b) is a diagram showing a stress distribution in a horn due to ultrasonic vibration of the rotary circular blade. Is.

An ultrasonic horn 7 is connected to an expansion horn 7 to expand the amplitude of ultrasonic vibration, and a horn 3 is further connected to the tip of which a circular blade (round blade) 2 is fixed by a fixing screw 1 '. Then, the ultrasonic transducer 6, the expansion horn 7, the horn 3, and the round blade 2 are integrally rotated about the rotating shaft 11.

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

The joint portion 12 between the expansion horn 7 and the horn 3 is formed at a place where the design stress is the smallest. Further, since the tip of the fixing screw 1'has only a structure without air at the tip thereof, the stress also becomes a value close to zero.

In addition, the vibration mode becomes like the vibration mode curve 10 ',
The amplitude is minimum when the stress is maximum, and the amplitude is maximum when the stress is minimum.

(Problems to be Solved by the Invention) By the way, looking at the stress distribution curve 9'in FIG. 2 (b), a stress of P _a is applied at the position of the round blade 2. Therefore, heat and fatigue may be generated due to the stress on the mounting portion of the round blade 2, and the round blade may be damaged.

In view of the above-mentioned 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 Problem) The present invention has the following means configuration in order to achieve the above object.

That is, the ultrasonic vibrating rotary round blade of the present invention is a rotary round blade for rotating a round blade by attaching a horn to an ultrasonic transducer, attaching the round blade to the horn, and rotating the ultrasonic transducer and the horn together. It is characterized in that the mounting position of the round blade in the direction of the horn rotation axis is set to a position where the stress is minimized in the stress distribution of the horn due to ultrasonic vibration.

(Operation) The operation will be described below.

If the material, diameter, length and vibration frequency of the horn are determined, the stress distribution can be calculated. In the present invention, since the round blade is attached to the position where the stress is minimized in the stress distribution thus obtained, the stress applied to the round blade is naturally small. Thus, an ultrasonic vibrating rotary round blade with a small stress applied to the round blade can be obtained.

(Examples) Examples 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 a stress distribution in the embodiment of FIG.

The difference from FIG. 2 is that the horn 4 is also connected to the horn 3 on the round blade 2 so that the round blade 2 is sandwiched by the connecting screws 1. 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 FIG. At the joint portion 12 between the horn 3 and the expansion horn 7, the minimum is the same as in the case of FIG. 2B, then the minimum is at the position of the round blade 2, and finally the minimum at the tip of the horn 4. .

The vibration mode is as shown by the vibration mode curve 10, and the amplitude becomes maximum at the minimum stress, and the amplitude becomes minimum at the maximum stress.

In the present embodiment, a round blade is attached to a position where the stress is minimized in the stress distribution of the horn 3 and the horn 4 having the same material and the same diameter.

In this embodiment, the round blade is mounted so as to be sandwiched between the horn 3 and the horn 4. However, one of the horn 3 and the horn 4 and the round blade are integrally manufactured, and the other one is screwed. The horns 3 may be combined with each other, or a horn having a combined length of the horn 3 and the horn 4 may be attached with a round blade in the middle or may be manufactured as an integral structure.

(Effects of the Invention) As described above, the ultrasonic vibrating round blade of the present invention reduces the stress applied to the round blade by setting the mounting position of the round blade to the position where the stress is minimized in the stress distribution of the horn. There is an advantage that heat generation, fatigue and damage due to stress are almost eliminated.

[Brief description of drawings]

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 blade. 1 ... Coupling screw, 1 '... Fixing screw, 2 ... Round blade, 3,4
...... Horn, 6 ... Ultrasonic transducer, 7 ... Expansion horn,
9,9 ′ …… Stress distribution curve, 10,10 ′ …… Vibration mode curve,
11 …… Rotary axis, 12 …… Joined part.

Claims (1)

[Claims] 1. A rotary round blade, wherein a horn is attached to an ultrasonic oscillator, and a round blade is attached to the horn to rotate the ultrasonic oscillator and the horn. An ultrasonic vibrating rotary round blade characterized in that the mounting position is set to a position where the stress is minimized in the stress distribution of the horn due to ultrasonic vibration.