JPH0212719B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a processing tool for an ultrasonic cutting device, and the tip of the processing tool for the ultrasonic cutting device is configured in a thin plate shape so that the unevenness depth is about 1/1 of that of the applied ultrasonic wave. An ultrasonic cutting device that makes ultrasonic cutting extremely efficient by configuring a concave-convex blade with a wavelength shorter than 20 wavelengths and a convex portion width smaller on the tip side of the convex portion than on the root side of the convex portion. The purpose is to provide processing tools for.

The present inventor has discovered that when cutting food, etc., by applying ultrasonic vibration along the pushing direction of the knife, the cutting becomes extremely smooth and efficient, and the cut surface becomes beautiful. For foods rich in fiber, such as cakes with pineapple mixed in with pudding, or meat with muscle such as shoulders and shins, a knife that applies ultrasonic vibrations can be used. In the case of a conventional type, the disadvantage is that the object to be cut loses its shape during cutting. That is, the first
As shown in the figure, at the tip of the 1/2 wavelength horn 1,
Thin plate-shaped blade 2 with dimensions of 1/2 wavelength long and 1/2 wavelength wide
For example, when trying to cut a cylindrical cake containing pineapple into a fan-shaped cake by applying ultrasonic waves in the direction of the arrow using an ultrasonic cutting device equipped with a If the cut is not made parallel to the direction, the cake will lose its shape during cutting, and the cake will have no commercial value. In FIG. 1, 3 is an object to be cut such as a cake block, 4 is a cone, 5 is a vibrator, and 6 is an ultrasonic oscillator.

The inventor of the present invention had been struggling to find a countermeasure against the occurrence of the above-mentioned drawbacks, and on a whim, he attempted ultrasonic cutting using a knife whose blade part was slanted in the width direction. As a result, we discovered a phenomenon in which even materials rich in fiber can be cut well without causing deformation. Based on the discovery of such a phenomenon, the present inventor has developed a system as shown in Fig. 2.
That is, a thin plate-like blade 9 having a trapezoidal shape with a cutting edge on the inclined part 8 and having a width of 1/2 wavelength and an average length of 1/2 wavelength.
was attached to a horn and ultrasonic cutting was performed while applying ultrasonic waves as in the case shown in FIG. 1, but in this case, good cutting could not be performed.

The inventor investigated why such a difference occurred, and as a result of repeating various experiments,
Even if the cutting edge is inclined, if the width of the thin plate-like blade increases, the length of the thin plate-like blade will differ greatly in each part of the blade, and it will exhibit different resonance characteristics depending on the length, and the overall It has been found that a vibration system having only one resonance point is no longer configured, and good ultrasonic cutting cannot be performed. As a result of further research, it was found that if the tip of the thin plate-shaped blade is configured to have a serrated blade or a wave-shaped blade, for example, the above drawbacks can be eliminated and good ultrasonic cutting can be performed. It was.

Embodiments of the processing tool of the ultrasonic cutting apparatus according to the present invention will be described below.

FIG. 3 is an explanatory diagram of a first embodiment of a processing tool of an ultrasonic cutting device according to the present invention.

In the same figure, 11 has a length of approximately 1/2 wavelength of the applied ultrasonic wave,
It is a thin plate with a width of about 1/2 wavelength of the applied ultrasound, and the tip of this plate 11 is formed into an approximately right triangular uneven portion 12.
A blade 13 is formed along the . The concave or convex pitch P of this uneven portion 12 is shorter than about 1/12 wavelength of the applied ultrasonic wave, and the uneven depth l of the uneven portion 12 is shorter than about 1/20 wavelength of the applied ultrasonic wave. It is configured. The inclination angle α of the blade 13 is set to be as large as possible, for example, 30° or more within the size range of the uneven portion.

FIG. 4 is an explanatory diagram of a second embodiment of the processing tool of the ultrasonic cutting device according to the present invention.

In the figure, reference numeral 16 denotes a plate similar to the plate 11 of the first embodiment, and an approximately isosceles triangular uneven portion 17 is formed at the tip of the plate 16. A blade 18 is formed along the section. still,
In this embodiment as well, the uneven portion 17 or the convex pitch is shorter than about 1/12 wavelength of the applied ultrasonic wave, and the depth of the uneven portion 17 is shorter than about 1/20 wavelength of the applied ultrasonic wave. It is configured.

FIG. 5 is an explanatory diagram of a third embodiment of the processing tool of the ultrasonic cutting device according to the present invention.

In the figure, reference numeral 21 denotes a plate similar to the plate 11 of the first embodiment, and a substantially obtuse triangular uneven portion 22 is formed at the tip of the plate 21. A blade 23 is formed along the . In this embodiment as well, the concave or convex pitch of the uneven portion 22 is shorter than about 1/12 wavelength of the applied ultrasonic wave, and the uneven depth of the uneven portion 22 is about 1/20 wavelength of the applied ultrasonic wave. It is designed to be shorter.

FIG. 6 is an explanatory diagram of a fourth embodiment of the processing tool of the ultrasonic cutting device according to the present invention.

In the figure, reference numeral 26 denotes a plate similar to the plate 11 of the first embodiment, and a wave-like uneven portion 27 is formed at the tip of the plate 26.
A blade 28 is formed along 7. In this embodiment as well, the concave or convex pitch of the uneven portion 27 is shorter than about 1/12 wavelength of the applied ultrasonic wave, and the uneven depth of the uneven portion 27 is about 1/20 wavelength of the applied ultrasonic wave. It is designed to be shorter.

The rear end of the machining tool configured as in the above embodiment is attached to a horn with a length of 1/2 wavelength, and the workpiece is pushed along the cutting direction, that is, in the length direction of the machining tool. For example, when a cake containing pineapple pulls is cut by force while applying ultrasonic vibration, the pineapple portion can also be cut very well, and the cake can be cut very efficiently without losing its shape. On the other hand, if the concave or convex pitch of the uneven part is longer than 1/12 wavelength of the applied ultrasonic wave, or if the uneven depth of the uneven part is longer than 1/20 wavelength of the applied ultrasonic wave, the machining tool The resonance characteristics of the vibration system, including the blade, began to differ depending on the position of the blade, and it no longer exhibited good vibration characteristics, making it impossible to perform efficient ultrasonic cutting.

In other words, if we investigate how the vibration characteristics change depending on the value of the unevenness depth l, we will find that, for example, the type of processing tool shown in Fig. 4 made of steel plate (the length is approximately 9.5 mm)
cm, which means that when the applied frequency is 28.3KHz, the sound speed of the longitudinal wave along the plate is approximately 5.39×10 ⁵ cm/s
Therefore, in a device with an applied frequency of 28.3 KHz, the amplitude ratio (amplitude (min)/
Amplitude (max), which is the amplitude at the tip at the concave position of the uneven portion at the tip of the processing tool/amplitude at the tip at the convex position of the uneven portion at the tip of the processing tool ) and l, as shown in Figure 11,
According to this graph, when l is shorter than approximately 1/20 wavelength, the amplitude ratio is large and the vibration characteristics are good, whereas when l becomes longer than 1/20 wavelength, the amplitude ratio decreases rapidly and the vibration characteristics are poor. I can understand how things can get worse quickly.

In addition, when examining how the vibration characteristics change depending on the concave or convex pitch P, that is, in the case of the same thing as above, the amplitude ratio (amplitude (min)/amplitude) of the longitudinal vibration at the tip of the processing tool When we examine the relationship between (max) and P, we find that it is as shown in Figure 12. According to this graph, P is approximately 1/
It can be seen that when P is shorter than 12 wavelengths, the amplitude ratio is large and the vibration characteristics are good, whereas when P becomes longer than 1/12 wavelength, the amplitude ratio decreases and the vibration characteristics become worse.

Furthermore, as can be inferred from these graphs, if P and l are within a certain range, that is, within the range mentioned above, a correspondingly good amplitude ratio can be ensured. Although regular formation is desirable in terms of manufacturing efficiency of processing tools, it is not necessarily an absolute requirement.

FIG. 7 is an explanatory diagram of a fifth embodiment of the processing tool of the ultrasonic cutting device according to the present invention.

In the figure, reference numeral 31 denotes a plate similar to the plate 11 of the first embodiment, and the tip of this plate 31 is formed into an uneven portion 32 having a substantially right triangular shape. Incidentally, the concave or convex pitch P of the uneven portion 32 is shorter than about 1/12 wavelength of the applied ultrasound, and the uneven depth l of the uneven portion 32 is shorter than about 1/20 wavelength of the applied ultrasound. It is structured as follows. The inclination angle α of the uneven portion is configured to be as large as possible within the size range of the uneven portion. moreover,
In this embodiment, the blade portion is different from that in the first embodiment, and the serrated blade 33 has an uneven surface having a pitch and a depth smaller than the pitch P and depth l of the uneven portion. It is configured along the shaped portion 32.

FIG. 8 is an explanatory diagram of a sixth embodiment of the processing tool of the ultrasonic cutting device according to the present invention.

In the figure, 36 is a plate similar to the plate 11 of the first embodiment, and the tip of this plate 36 is formed into an uneven portion 37 having a substantially isosceles triangular shape. still,
The concave or convex pitch of the uneven portion 37 is shorter than about 1/12 wavelength of the applied ultrasound, and the depth of the unevenness of the uneven portion 37 is shorter than about 1/20 wavelength of the applied ultrasound. ing. A serrated blade 38 similar to the embodiment described above is formed along this uneven portion.

FIG. 9 is an explanatory diagram of a seventh embodiment of the processing tool of the ultrasonic cutting device according to the present invention.

In the figure, reference numeral 41 denotes a plate similar to the plate 11 of the first embodiment, and the tip of this plate 41 is formed into an uneven portion 42 having a substantially obtuse triangular shape. The concave or convex pitch of the uneven portion 42 is configured to be shorter than about 1/12 wavelength of the applied ultrasound, and the depth of the unevenness of the uneven portion 42 is shorter than about 1/20 wavelength of the applied ultrasound. has been done. A serrated blade 43 similar to that of the embodiment described above is formed along this uneven portion.

FIG. 10 is an explanatory diagram of an eighth embodiment of the processing tool of the ultrasonic cutting device according to the present invention.

In the figure, reference numeral 46 denotes a plate similar to the plate 11 of the first embodiment, and a roughly wavy uneven portion 47 is formed at the tip of the plate 46. Incidentally, the concave or convex pitch of this concavo-convex portion 47 is approximately 1/12 of the applied ultrasonic wave.
It is shorter than the wavelength, and the depth of the unevenness of the uneven portion 47 is configured to be shorter than about 1/20 wavelength of the applied ultrasonic wave. A serrated blade 48 similar to the embodiment described above is formed along this uneven portion 47.

In this way, by configuring the uneven portion and the serrated blade as in the embodiment shown in Figs.
Ultrasonic cutting was even more efficient, and the cut surface was clean and the shape was not lost.

In other words, the vibration characteristics are good by making the structure of the concavo-convex portion similar to that of the first to fourth embodiments, but if the serrated blade is further formed, the angle α becomes substantially larger, i.e. The cutting resistance during ultrasonic vibration cutting is further reduced, and therefore the processing tools of the ultrasonic cutting apparatuses of the fifth to eighth embodiments are even better than those of the first to fourth embodiments. .

As described above, the processing tool of the ultrasonic cutting device according to the present invention is configured such that the processing tool attached to the horn of the ultrasonic cutting device is a plate-shaped body, and the tip of the plate-shaped body has a depth of unevenness. The blade has a concave-convex shape that is shorter than approximately 1/20 wavelength of the applied ultrasonic wave, and the width of the convex part is smaller on the tip side of the convex part than on the base side of the convex part.
Even materials rich in fiber can be cut well, the object to be cut does not lose its shape during cutting, and the vibration characteristics of the entire vibration system including the processing tool are good and efficient. In addition, the processing tool does not cause sideways movement, and extremely good ultrasonic cutting can be performed during push-cutting, and the processing tool that is attached to the horn of the ultrasonic cutting device is configured in a plate shape. The tip of this plate-like body is configured to have an uneven shape in which the depth of the unevenness is shorter than about 1/20 wavelength of the applied ultrasonic wave, and the width of the protrusion is smaller on the tip side of the protrusion than on the root side of the protrusion. The uneven depth and pitch of the uneven portion are smaller than the uneven depth and pitch of the uneven portion, so the ultrasonic wave is even better than in the case of the above structure. It has features such as being able to cut.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an ultrasonic cutting device, FIG. 2 is an explanatory diagram of a thin plate blade attached to a horn of the ultrasonic cutting device, and FIGS. 3 to 10 are an explanatory diagram of an ultrasonic cutting device according to the present invention. FIGS. 11 and 12 are graphs illustrating the features of the processing tool of the ultrasonic cutting device according to the present invention. 11, 16, 21, 26, 31, 36, 41,
46...Plate body, 12, 17, 22, 27, 32, 3
7, 42, 47... uneven portion, 13, 18, 23,
28, 33, 38, 43, 48...blade.

Claims (1)

[Claims] 1. A processing tool to be attached to the horn of an ultrasonic cutting device is configured as a plate-like body, and the depth of the unevenness at the tip of the plate-like body is shorter than about 1/20 wavelength of the applied ultrasonic wave. ,
A processing tool for an ultrasonic cutting device, characterized in that the width of the convex portion is smaller on the tip side of the convex portion than on the base side of the convex portion. 2. A processing tool to be attached to the horn of an ultrasonic cutting device is configured as a plate-shaped body, and the tip of this plate-shaped body has an uneven depth that is shorter than approximately 1/20 wavelength of the applied ultrasonic wave.
In addition, the width of the convex portion is smaller on the tip side of the convex portion than on the base side of the convex portion, and the concave and convex portion has a depth of convexity and a pitch of the convexity and convexity of the convexity shape portion. A processing tool for an ultrasonic cutting device, characterized in that it has a concave-convex blade with small pitches.