JPH0413101B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a rotary substrate for a blade and a rotary blade using the same, and is particularly directed to suppressing noise generated during rotation. [Prior Art] A rotary blade that can prevent the noise generated by the rotary blade is disclosed in Japanese Patent Publication No. 10040/1983. This rotary blade has a plurality of grooves with an appropriate width, e.g. 1.5 mm, and an appropriate length, e.g. about 10% of the outer diameter of the saw body, extending from near the base of the blade toward the center on the periphery of the rotating base plate. The grooves are formed at equal intervals, and each of the grooves is filled with a curable synthetic resin that is softer than the rotating substrate and fixed to the grooves. According to this configuration, when rotating, the low sound waves from the curable synthetic resin filling layer interfere with the sound waves generated from the blade, preventing the synchronization and resonance of the sound waves as a whole, changing a simple high-pitched sound into a complex low-pitched sound. It is explained that the high, sharp metallic sound is erased. In fact, the blades formed around the rotating board rotate at high speed, creating turbulence in the air and emitting sound.
It is thought that the generation of this turbulent flow causes vibrations due to external force, or forced vibrations due to external force due to the load on the material to be cut, and this vibration resonates with the vibration of the rotating board and generates loud noise. . In this regard, what is described in the above-mentioned publication is to provide a plurality of grooves approximately in the center from the vicinity of the base of the blade portion, and fill these with a hardening resin that is softer than the blade to serve as a buffer zone for vibration propagation. It is understood that the propagation of vibrations in the rotating substrate is partially stopped, and it is thought that resonance is also reduced. [Problem to be solved] However, in the device described in the above publication, there is a vibration balancing band in the radial direction from the center, and due to this, the vibration generated by the blade part is caused by a circular vibration on the rotating substrate. Although it is suppressed in the circumferential direction, it is thought that the vibrations generated in the blade portion are reflected at the center, and the resulting vibrations cannot be suppressed sufficiently. [Means for solving the problem] From the above point of view, the present invention aims to reduce the vibrations from the blades (serrations) around the rotating substrate, which cause large vibrations, not only in the circumferential direction on the rotating substrate, but also in the circumferential direction of the rotating substrate. The configuration is such that a plurality of first halves open toward the center of rotation of the rotating substrate based on a first circumference located near the outer edge of the rotating substrate. Circular slits are formed at equal intervals, and a second circumference on the inside where the first slits are located and a radius connecting both ends of adjacent slits of the first slits and the center of the substrate are taken as a reference. forming a plurality of semicircular slits that open in a direction opposite to the opening direction of the adjacent slits and partially block the opening direction of both slits;
All the slits are filled with filler to integrate with the rotating substrate. Further, in the present invention, the grooves between the plurality of blades formed on the outer periphery of the substrate are filled with a filler in the same manner as described above to integrate the rotating blades. The present invention will be explained below with reference to embodiments shown in the drawings. FIG. 1 shows the entire rotating board for blades of the present invention. 1 indicates a rotating board. The rotating board 1 is formed into a circular shape by punching out a steel plate or a stainless steel plate, and 2 is a shaft hole formed in the center of the rotating board 1;
3 indicates a blade, and 4 and 5 indicate semicircular first and second slits. FIG. 2A is an enlarged view of the portion surrounded by BB in FIG. 1, and FIG. 2B is an enlarged sectional view taken along line AA in FIG. In the figure, 6 indicates the filled filler. As shown in FIG. 1, in this example, there are 24 first slits 4 and 12 second slits. The thickness of the board is, for example, 4 to 9.5 mm, and the diameter of the board is, for example, 30 to 100 inches (75 to 254 cm).
That's about it. With the center of the rotating substrate 1 as 0, a first circumference 7 is set near the outer edge of the rotating substrate 1, and 24 semicircular slits 4 are formed around the entire outer circumference with this as a reference. . At this time, the distance d between the end portions 9 and 9' of adjacent slits 4 is set to be smaller than the inner radius r×2 of the semicircular slit 4 to be formed. Each semicircular slit 4 is located at the center 0 of the rotating substrate 1.
The semicircular slit 4 has an arc slightly larger or smaller than that of a semicircle. This semicircular slit 4 is formed by a laser processing machine, and both ends of each slit are processed to be rounded, and the slit width is
Approximately 0.4mm is appropriate. The slit formed above will be referred to as the first semicircular slit. Next, a second circumference 8 is set inside the first circumference 7 with the center 0 as the origin, and this circumference 8 and both ends 9, 9 of the first adjacent semicircular slits 4 are set. ′ and the center 0 of the substrate as a reference, the slits 4 are opened in a direction opposite to the opening direction of the adjacent slits 4 on the inside of the circumference 8 (the opening direction is outward), and at the same time both ends 9,
Twelve semicircular slits 5 are formed at every other interval beyond 9' to partially block the opening direction of both slits 4, 4. The processing of the slit 5 and the slit width are the same as the processing of the slit 4. In the above, the radial difference l between the first circumference 7 and the second circumference 8 is related to the mechanical strength of the rotary substrate 1 under cutting load. With this shape and arrangement of the slit, the total length of the slit itself can be increased without weakening the stiffness of the board (the rigidity of the board to support the blade within a predetermined plane during high-speed rotational grinding). , the amount of filler can also be increased and the sound deadening effect can be improved. Furthermore, the semicircular slits 4 and 5 may have the same diameter or may have a slight difference. All the semicircular slits 4 and 5 are filled with a filler made of synthetic resin mixed with a heat-resistant, pressure-resistant, and vibration-resistant sealant. The hardness of the synthetic resin filled here can be adjusted from a rigid state to a flexible state, and it has water resistance that does not dissolve in cutting water, and has strong metal adhesion that will not come off due to the centrifugal force caused by high rotational speeds. A material with a low viscosity that is easy to fill and is easy to fill is optimal.As a sealing material, a material containing, for example, asbestos or glass fiber is used, and this filler shall have a hardness lower than that of the rotating substrate after curing. . [Test example] Diameter 40, 60, 72, 100 inches (approximately 100 to 254 cm),
Rotating board (normal board) with thickness 5.0~7.0, 6.5~9.0mm
and a first semicircular slit with a width of 0.2 mm on the same board.
24 slits, 12 second semicircular slits (slit processed substrate), and all slits are filled with a base material of 40 or more low viscosity flexibility adjustable epoxy casting resin,
Hardening agent 55 or less, heat resistant, pressure resistant, vibration resistant sealant 10 ~
A resin-filled substrate (resin-filled substrate) was prepared by injecting and curing a filler with a weight selected from 15 (both weight %), and a sound-reducing curing test was conducted.
Table 1 shows the results. The measurement distance was 1 m in a low-noise room, and the measuring instrument was NA-09 A scale manufactured by Rion.

[Table] On the other hand, the size of Table 1 above is 40 inches (approx. 100 cm)
Synthesis of the same composition as above was made by forming the four grooves of the above-mentioned publication from near the base of the sawtooth part toward the center, with a groove width of 1.5 mm and a length of 4 inches (approximately 10 cm). When a resin filler was filled and a sound silencing effect test was conducted under the same conditions, the result was 94 dB. Next, the rotary blade of the present invention using the slit-processed substrate will be explained with reference to FIGS. 3A and 3B. Figure 3A shows the part corresponding to the blade around the board in Figure 1, and 7 is U grooves formed at equal intervals on the outer edge of the board 3 to allow grinding powder to escape and heat dissipation. This is the part that becomes the part. A chip 9 formed by integrally sintering diamond powder with metal or other sintered tungsten carbide is fixed to the entire base 8 formed by the U groove 7 as a blade by brazing and welding to form a blade. Ru. This point is no different from the conventional one. Next, in the present invention, the U-groove 7 is filled with a filler 6 having the same composition as the filler described above. However, the compositions do not necessarily have to be the same. In this case, the upper surface 10 of the filler 6 is placed in the groove, leaving a groove with sufficient depth for the chips 9 in front and behind. Figure 3B shows the keyway 11 in place of the embodiment in A above.
Indicates what is equipped with. The filling of the filler 6 is the same as shown in A. A rotating blade is thus formed. [Test Example] Diameter 40 inches and thickness 5.0 mm in the above test example
The first 24 semicircular slits, the second
12 semicircular slits are formed, each slit is filled with a filler on a rotating substrate, and around this rotating substrate, chips are fixed on the entire base as described above, and filler is filled in the U groove. We prototyped a filled rotating blade, and without applying any grinding load to it,
When rotated at 550 rpm, both measurements were 92 dB using the same measurement method as above. When the latter was subjected to grinding with a load applied and a similar measurement was made, it was 100 dB. This was found to be approximately 10 dB lower than a conventional model with the same shape but without any noise reduction measures applied to the rotating board. [Effects of the Invention] From the above results, the present invention is effective only when the formed semicircular slit is filled with a filler containing a synthetic resin and a sealant and is integrated with the substrate. Furthermore, it is recognized that the sound-dampening effect is sufficient compared to the conventional one in which the groove facing the center is filled with synthetic resin. Compared to conventional products, the rotating blade that uses the rotating substrate of the present invention and has chips fixed to the stand around the substrate has
Although it has a sound-deadening effect, filling the grooves between the chips with a filler further improves the effect and improves the working environment in which this type of rotary blade is used.

[Brief explanation of drawings]

FIG. 1 shows a rotating board embodiment of the invention. Second
Figure A is an enlarged view of section B-B in Figure 1, and Figure A is an enlarged view of section B-B in Figure 1.
- It is an enlarged view of the A line cross section. FIGS. 3A and 3B show embodiments of the rotating blade of the present invention, respectively. 1... Rotating substrate, 2... Shaft hole, 3... Blade, 4, 5... Semicircular slit, 6... Filler,
7...U groove, 8...base, 9...chip, 10...
...Top surface of filler, 11...Keyway.

Claims (1)

[Scope of Claims] 1. A first plurality of semicircular slits opening toward the center of rotation of the rotating substrate are formed at equal intervals based on a first circumference located near the outer edge of the rotating substrate, and The opening of the adjacent first slits is based on the inner second circumference where one slit is located and the radius connecting both ends of the adjacent slits of the first slit and the center of the substrate. forming a plurality of second semicircular slits that open in a direction opposite to the opening direction and partially blocking the opening direction of the adjacent slits, and filling all the slits with a filler to form a rotating substrate. A rotating board for a rotating blade, characterized by integrating the following. 2. A rotating blade characterized in that a large number of grooves are formed on the outer edge of the rotary substrate for a rotary blade according to claim 1, the blade is fixed to a platform formed by the grooves, and the grooves are filled with a filler. blade.