JPH0737783Y2 - Ultrasonic cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a cutting device for cutting an object to be cut, and more particularly to an ultrasonic cutting device for cutting by using ultrasonic vibration.

[Conventional technology and problems to be solved]

For example, in general saws, the blade part may escape from a predetermined cutting position during cutting, the object to be cut or cut (the object to be cut) may be deformed, or excessive residual stress may occur. Therefore, the blade portion may be warped or deformed, resulting in a reduction in processing accuracy.

Therefore, in order to improve such a problem, a cutting device as shown in FIG. 4 has been developed. That is, this has an oscillating portion 101 at the base end of the blade portion 100, and the vibration generated by the oscillating portion 101 oscillates the blade portion 100 in the length direction of the blade surface thereof, thereby This is for cutting / cutting cut objects.

However, in such a cutting device, as shown in FIG. 5, when vibrating at a constant frequency, the cutting ability at the blade portion (A / C) corresponding to the node of the vibration is It is much lower than that of the area marked with, and a large cutting unevenness occurs.

Therefore, in consideration of the above-mentioned conventional problems, the present invention can prevent the cutting force on the blade surface from being uneven, and
An object of the present invention is to provide an ultrasonic cutting device capable of significantly improving the cutting force.

[Means for Solving the Problems]

That is, the present invention is an ultrasonic cutting device for applying an ultrasonic vibration to a blade surface direction of a blade portion to cut an object to be cut,
It has at least two vibrating means for generating ultrasonic vibrations of different frequencies, where a half-integer multiple of the wavelength of the ultrasonic vibration is the blade surface length of the blade portion.

[Action]

In the ultrasonic cutting device of the present invention, at least two vibrating means through which a current of a predetermined frequency flows so that both ends of the body are antinodes, that is, the length of the blade surface is exactly an integral multiple of a half wavelength. The blade vibrates by each vibrating means, which causes vibration of a size that superimposes each vibration.
In other words, there is no part corresponding to a node, and the cutting ability can be greatly improved.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an ultrasonic cutting device according to the present invention. This ultrasonic cutting device includes a main body 1, a gripping body 4 having first and second vibrating means 2 and 3, and a control unit. And means (not shown).

The main body 1 has a substantially U-shaped shape, has a blade portion 1a having a blade surface length of 1 at the central portion, and holds the grippers 4 at both ends.

The first vibrating means 2 applies an alternating current of a predetermined frequency f _{1 to} generate ultrasonic waves of a constant frequency n ₁ (= f ₁ ) having vibration antinodes at both ends of the blade 1a as shown in FIG. Vibration is generated, and a piezoelectric element is used in this embodiment. The frequency n ₁ is such that half the wavelength (λ / 2) is equal to the length 1 of the blade surface, that is, V = n ₁ λ, that is, n ₁ = 2V / l (where V is the ultrasonic wave The frequency of the alternating current to be energized is controlled by the control means so that the speed becomes).

In the second vibrating means 3, an alternating current having a predetermined frequency f ₂ is applied to a piezoelectric element similar to that of the first vibrating means 2, so that both ends of the blade portion 1a vibrate as shown in FIG. Ultrasonic vibration having a constant frequency n ₂ (= f ₂ ) having an antinode is generated. The frequency n ₂ of the _second vibrating means 3 is
Normally, the length of twice the half wavelength (λ / 2) is exactly equal to the length 1 of the blade surface, that is, V = n ₂ · λ ∴ n ₂ = V / (2l) The frequency of the alternating current is controlled by the control means.

The gripping bodies 4 and 5 are tapered on the tip side, and the main body 1
The vibration energy is efficiently transmitted to the blade portion 1a of the main body 1 and the tip portion is fixed to the end portion of the main body 1.

The control means is provided with a frequency converter, and outputs a current of frequency f ₁ to the first vibrating means 2 and a current of frequency f ₂ to the second vibrating means 3. .

Therefore, according to this embodiment, the ultrasonic vibrations of the frequencies n ₁ and n ₂ are superposed by simultaneously operating the _first and _second vibrating means 2 and 3, that is, as shown in FIG. Ultrasonic vibration with a large amplitude is generated without generating a vibration node with zero displacement.

As shown in FIG. 3, the ultrasonic cutting device of the present invention has a substantially L-shaped main body 6, a gripping body 7 fixed only to one end of the main body 6, and a gripping body 7 having two It may be constituted by individually installed vibration generating means having a predetermined frequency, for example, the same first and second vibration generating means 2 and 3 as those of the previous embodiment.

〔effect〕

As described above, according to the ultrasonic cutting device according to the present invention, each of the vibrating means has both ends of the main body as a vibration antinode, and the vibration of the vibrating means has an integral multiple of a half wavelength thereof. The ultrasonic vibration is generated in such a manner that the edge length is exactly the length of the blade surface, and these wavelengths are configured to be different from each other. Since it is possible to suppress the generation of vibration nodes with zero displacement over the whole and to obtain a large vibration, it is possible to obtain a high cutting ability without generating a region where the cutting force is extremely low in the entire blade surface.

[Brief description of drawings]

FIG. 1 is a plan view showing an ultrasonic cutting device according to the present invention,
2 is an explanatory view showing a vibration state in the cutting device shown in FIG. 1, FIG. 3 is a plan view showing a modified example of the ultrasonic cutting device according to the present invention, and FIG. 4 is a plan view showing a conventional cutting device. 5 and 5 are explanatory views showing a vibrating state of the cutting device shown in FIG. 1a …… Blade part 2,3 …… Vibration means

Claims (1)

[Scope of utility model registration request] 1. An ultrasonic cutting device for applying an ultrasonic vibration to a blade surface of a blade to cut an object to be cut, wherein a half integer multiple of a wavelength of the ultrasonic vibration is a blade surface of the blade. An ultrasonic cutting device comprising at least two vibrating means for generating ultrasonic vibrations of different frequencies that are long.