JPH072162Y2 - Circular saw body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention is directed to a main body of a rotary saw, ie, a substrate, provided with means for preventing the generation of noise called metal noise that significantly deteriorates the working environment when the rotary saw spins. Regarding

2. Description of the Related Art Generally, when a rotary saw is rotated at a high speed, the blade edge of the saw cuts air, and then an air vortex called a Karman vortex is formed. When the frequency of this vortex resonates with the natural frequency of the saw body, a very loud high frequency metallic sound is generated.
This metallic noise makes the working environment significantly worse. Therefore, various methods have been announced so far in order to prevent such high-frequency metallic noise. For example, as shown in Fig. 3, multiple (5 in the figure) from the periphery of the circular saw to the center.
Slits 4 and multiple grooves 5 (five in the figure) near the middle
The same applicant previously disclosed a circular saw having a main body 1 in which a substance 3 for absorbing and damping saw vibration is embedded near the center of each groove 2 (see Japanese Utility Model Application No. 62). -93692
issue). In the above disclosure, since the groove 2 separates the vibration between the outer peripheral portion and the central portion and the substance 3 in the premises absorbs the vibration, the vibration excited from the outer peripheral portion by the cutting action of the blade portion 5 at the time of cutting. Is cut off in the intermediate groove, and is absorbed and attenuated so that the frequency of the Karman vortex excited by the blade portion 5 or the like during idle rotation of the circular saw does not match the natural frequency of the saw itself,
In this way, the problem of resonance and resonance occurring in a specific region was solved very effectively.

However, with the diversification of types of work materials and diversification of specification machines today, the outer diameter and thickness of the main body, the thickness of the blade portion, the number of blades, the blade shape, the blade edge angle, etc. In this respect, circular saws with various specifications are produced and used. And even with circular saws that use the same body, the vibrations and frequencies that are generated and excited by these various circular saws are not limited to specific bands, and noise is generated over multiple bands, especially the cutting edge. When abrasion occurs, the vibrations and the like generated in the blade portion synergistically influence each other and become more complex. Such complex noise is very offensive to the site worker, as is the metallic sound due to resonance generated in a specific band.

Until now, there has not been a circular saw body having an effect of effectively absorbing and attenuating vibrations and frequencies over a wide variety of such bands.

The present invention solves this problem.

Means for Solving the Problems In order to solve these problems, the present invention discloses the above-mentioned Japanese Utility Model Application No. 62-93.
The position of the embedding substance in the groove formed in the saw body described in No. 692 was irregularly arranged.

Function The present invention effectively absorbs and damps the vibration waveform of the entire band generated by the circular saw by the vibration absorption / damping material arranged at different radial positions of the main body, that is, the substrate.

Embodiment FIG. 1 shows an embodiment of the main body. In this figure, a plurality of outer peripheral slits 12 directed toward the center are provided on the outer periphery of the circular saw body 10. A plurality of grooves 14 are provided in the middle portion of the circular saw. The groove 14 is provided with at least one hole 18 for embedding a substance 16 that absorbs and damps the vibration of the saw. The position of this hole 18 is, for example, the radial length of the inner part of the groove 14.
The difference (ro-ri) between the ri and the radius ro of the outer portion is divided into several equal parts (which are divided into four equal parts in the figure). Thus, the holes 18 are irregularly formed, and the substance 16 is embedded and fixed therein. As a result, the distance from the central position of the main body 10 to each hole 18 changes, and the main body is changed in relation to the weight of the substance embedded therein.
The balance of 10 may be lost. In that case, it is necessary to change the diameter of the embedding hole 18 and adjust the balance by the substance 16 embedded therein. When a plurality of holes are formed in one groove, the balance can be adjusted more easily.

FIG. 2 shows the main body in which not only the position of the embedding hole 22 for the embedding substance is changed but also the shape of the groove 24 itself is variously changed.
There are 20 examples. By varying the groove shape in this way according to the saw specifications, the vibration suppression area between the slits 26 can be made larger, and the deflection of the saw itself can be made minute.

In the above case, a different substance may be embedded in each hole 16.22 to balance the entire body.

Effect of the Invention Since the main body of the present invention embeds the embedding material in different radial positions, the transverse vibration waveform in the center direction between each slit is made different, and the vibration propagating to the entire saw in the entire vibration band It is possible to avoid concentrating on a single waveform, thereby suppressing mutual vibrations between the slits and reducing the amplitude in the entire vibration band of the vibration waveform that regulates the shake of the saw itself. In this way, vibrations and frequencies in a wide variety of bands can be effectively absorbed and attenuated over the entire region, and resonance resonance can be prevented and noise can be reduced to an uncomfortable amount. In addition, the lateral deviation of the saw is reduced, and the cutting work with a good cutting surface is possible.

[Brief description of drawings]

1 is a plan view showing a first embodiment of the present invention, FIG. 2 is a plan view showing a second embodiment of the present invention, and FIG. 3 is a plan view showing a known circular saw. Explanation of symbols 10, 20: body, 12, 26: slit 14, 24: groove, 16: embedding substance, 18: hole

Claims (2)

[Scope of utility model registration request] A main body of a circular saw having a blade portion on an outer peripheral portion, wherein a plurality of slits are formed from the outer peripheral portion toward a center direction, and a plurality of grooves are provided in an intermediate portion. Is provided with at least one hole for embedding a material for absorbing and damping the vibration of the circular saw, the positions of the holes being scattered at different distances from the center of the main body. 2. The body of claim 1, wherein the slit comprises a plurality of different shapes.