JPS63256308A - Noise preventing device in circular saw base disc - Google Patents

Abstract

PURPOSE:To rapidly damp vibration of a circular saw by irradiating a laser beam onto a disc so as to allow the spot of the laser beam to move from the large diameter side to the small diameter side while meandering to carry out one reciprocation along an arcuated path in each predetermined area so as to form a cantilever piece in the area. CONSTITUTION:Two kinds of first and second noise preventing means 13, 14 which are formed by irradiating a laser beam onto a disc 11 and by scanning and cutting the same along predetermined shapes, are formed in the outer peripheral section of the disc 11 at four positions located circumferentially of the disc at predetermined intervals. Each first noise preventing device 13 has a group of six semicircular cantilever pieces 15 which are arranged in a direction from the center axis of the disc 11 to the outer periphery thereof and in the clockwise direction with their openings confronting the outer periphery of the disc 11. By advancing the sport of the laser beam by a predetermined distance from the outer periphery of the disc 11 in the clockwise direction, cantilever pieces 17 each having a large area are formed, and by again advancing the laser beam spot by a predetermined distance toward the outer periphery of the disc 11 along a semicircular shape, the outer peripheral edges of second cantilever pieces 15b on the rear stage, are formed, and by reversing the laser spot with a diameter of about 0.7mm toward the center axis of the outer peripheral edge so as to circularly move the beam spot, second cantilever pieces 15b are formed.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a board for a circular saw for cutting stone or wood, and more particularly, to a board for a circular saw that reduces noise generation due to vibration of the board during cutting. This invention relates to a noise prevention device.

(Conventional technology) As a conventional technique, there is a structure shown in FIG.

In FIG. 4, reference numeral 1 is a circular saw, and a large number of sawtooth bases 2a are formed on the outer periphery of a disc-shaped disc body 2, and a carbide tip 6 is fixed to each of these sawtooth bases 2a. Become.

On the outer periphery of the disc body 2, 1M sound prevention devices 3 are provided at four locations in the circumferential direction at predetermined intervals.

This noise prevention device 3 cuts through the wall of the disc body 2 by irradiating a laser beam onto the disc body 2 in a meandering manner, and one end is fixed to the disc body 2 and the other end is attached to the disc body 2. It is formed by forming a large number of separated elongated linear cantilever pieces 4.

To explain in detail an example of the above cantilever piece, 0°2m to 0
．． Irradiation with a laser beam of about 3no is started at a predetermined location on the disk body 2 (A), and after moving straight ahead about 3011I11 to the right from this starting point (A), the laser beam is irradiated at a radius of about 1.0mm. The vehicle is reversed and moved straight ahead by about 25+nw+ to the left, then reversed again at a radius of approximately 1.0 IIll and driven straight ahead toward the right for approximately 24.5 mm, and thereafter the radius of reverse is kept constant and the amount of straight travel is gradually reduced. The disc body 2 is cut through the disc body 2 by meandering several dozen times in the left and right direction, thereby making a large number of linear cantilever pieces 4 of equal width and connected to the disc body 2 alternately at the left and right ends adjacent to each other. form. Note that (a) in the figure is the end point of the cutting location by the laser beam.

Each moon holding piece 4 formed in this way is the 51st m.
It becomes as shown in (A) to (C).

That is, as shown in FIG. 5(A), the laser beam is irradiated straight from the starting point (A) to the right end (T) and then
When forming the slit 5a, this first slit 5a
The groove width is large, that is, the upper side wall 1a is difficult to deform due to heat.
and the lower side 15, the groove width is approximately equal to the diameter of the laser beam.

Next, as shown in FIG. 5(B), it is reversed at a small radius from the right end and moved straight to the left until it reaches the second slit 5b.
When the second slit 5b is formed, the upper side of the second slit 5b has a small area, that is, the first cantilever piece 4 is easily deformed by heat.
a and the lower side 1b which is difficult to thermally deform, the right open end 4a-1 of the first cantilever 4a is thermally deformed upward by the heat generated during the formation of the second slit 5b. The upper edge thereof comes into contact with the upper right edge of the first slit 5a.

Similarly, the second cantilever piece 4b and the third cantilever side 4 are sequentially formed by the third slit 5c, the fourth slit 5d, and so on.
The upper edges of the open ends 4b-1, 4cm1, .

(Problems to be Solved by the Invention) In the above-mentioned conventional method, a large number of cantilevered pieces were formed by laser beams into elongated straight lines and adjacent to each other on their long sides. Piece 4 has point contact where the contact area between the upper edge of each open end 4b-1, 4cm1, and the base 4a-2, 4b-2, lower edge of the cantilever piece on the previous stage is extremely small. state.

Then, the main body part of the disc body 2 vibrates, each moon holding piece vibrates at a different frequency from this, and the vibration of the main body part of the disc body 2 is damped by sliding contact between the two parts. However, as in the conventional case, the upper edge of the open end of each month holding piece 4,
If the contact area with the lower edge of the base of the cantilever piece on the front stage side becomes smaller, there is a drawback that the vibration damping function of the main body portion of the disc body 2 deteriorates.

Furthermore, if each of the moon holders 4 is formed into an elongated straight line so that they are adjacent to each other on their respective long sides, it is difficult to install the noise prevention device 3 in a predetermined area on the disc body 2. , the meandering distance of the laser beam becomes longer, which increases costs and cutting time.

That is, there is a drawback that the processing time for the noise prevention device 3 increases.

SUMMARY OF THE INVENTION An object of the present invention is to obtain a novel noise prevention device for a circular saw board that eliminates the above-mentioned drawbacks.

(Means for Solving the Problems) In order to achieve the above object, the present invention is configured as follows.

In other words, a laser beam is irradiated onto a disc in a meandering manner to cut through the wall of the disc to form a long and thin cantilever piece with one end fixed to the disc and the other end separated from the disc. In the noise prevention device for a circuit board for a circular saw, the cantilever piece is configured by irradiating a laser beam in a meandering manner on the disc body from the large diameter side to the small diameter side in a reciprocating arc shape per predetermined wide area. ,
The structure is such that the walls are formed in an elongated arc shape between walls having a predetermined wide area.

(Function) Since the present invention has the above configuration, when the laser beam irradiation is started at a predetermined position on the disc body and is advanced from this part in an arc shape toward the right end, for example,
A slit on the large diameter side is formed, and then the slit is turned inward at a predetermined small radius and moved toward the left in an arc shape, forming a slit on the small diameter side, which causes the left end to become a disc body. This results in the formation of an elongated arc-shaped cantilever whose right end is separated from the disk body.

In this case, the cantilever piece is formed between walls that have a predetermined wide area and are difficult to deform due to heat, so when the small diameter slit is formed, the large diameter slit is damaged by the heat of the laser beam. As a result, the amount of contact between the outer circumferential surface of the cantilever piece and the outer circumferential surface of the large-diameter slit increases in the longitudinal direction.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In the drawings, FIG. 1 is a side view showing an embodiment of the present invention;
FIG. 2 is an enlarged side view of the main part, and FIG. 3 is a side view showing another embodiment.

In FIG. 1, reference numeral 10 is a circular saw, which has a grinding wheel 12 mixed with diamond particles fixed to the outer periphery of a disc-shaped disc body 11, which has a substantially movable structure compared to the conventional one. It has become.

Two types of first and second noise prevention devices 1 are cut into predetermined shapes by irradiating a laser beam on the outer circumference of the disc body 11.
3 and 14 are provided at four locations in the circumferential direction at predetermined intervals.

As shown in FIG.
Semicircular arc-shaped cantilever pieces 15 are arranged from the axial center of the disk body 11 toward the outer circumferential direction and the clockwise turning direction, and their openings face the outer circumferential side.

For example, when the thickness of the disk body 11 is 1.6 nn, the formation of each of the cantilever pieces 15 is 0.2 nm to 0.3 rr.
The disk body 11 is irradiated with a laser beam of about n to cut through its wall, and the cutting procedure is as follows.

That is, the starting point (work) of laser beam irradiation is located on the axial center side of the disc body 11, and the laser beam irradiation is advanced from this starting point (1) toward the outer periphery of the disc body 11 in a semicircular arc shape to the axial center side. After forming the outer peripheral edge of the first cantilever piece 15a located at, for example, approximately 0.
It is reversed toward the axis of the outer circumferential edge at a radius of 7 mm, and is advanced in an arc along the outer circumferential edge to form the inner circumferential edge of the first cantilever piece 15a.

Next, the disc body 11 is advanced a predetermined distance toward the outer periphery of the disc body 11 in the right turning direction to secure a cantilever wall 17 having a wide area, and is again advanced in a semicircular arc shape toward the outer periphery of the disc body 11 to form the second stage. After forming the outer peripheral edge of the second cantilever piece 15b, approximately '0
, inverted toward the axis of the outer periphery with a radius of 7 mm,
The second cantilever piece 1 is advanced in an arc along the outer peripheral edge.
5b is formed.

Thereafter, in the same manner, with the cantilever wall 17 interposed, the outer peripheral edge and the inner peripheral edge of the third cantilever piece 15c to the sixth cantilever side 15f are sequentially formed, and the end point ( e)
The laser beam irradiation is ended at .

Further, as shown in FIG. 1, the second noise prevention device 14 described above has a semicircular arc-shaped cantilevered piece 16 consisting of two pairs.
In FIG. 1, they are arranged tangentially at the outer peripheral end of the disc body 11.

The above-mentioned cantilever pieces 16 are formed by positioning the starting point (force) on the outer peripheral side of the disc body 11 using the same laser beam as described above, and counterclockwise rotation of the disc body 11 from this starting point (force). After advancing in a semicircular arc shape toward the direction to form the outer peripheral edge of the first cantilever piece 16a located on the left, it is reversed toward the axis of the outer peripheral edge at a radius of about 0.7- The inner peripheral edge of the first cantilever piece 16a is formed by advancing in an arc shape along the outer peripheral edge.

Next, the disc body 11 is made to advance a predetermined distance straight in the clockwise rotation direction, and then is made to advance in a semicircular arc shape in the clockwise rotation direction of the disc body 11 to form the outer peripheral edge of the second cantilever piece 16b. , at a radius of about 0.7 m+, and is reversed toward the axis of the outer circumferential edge, and is advanced in an arc shape along the outer circumferential edge to form the inner circumferential edge of the second cantilever piece 16b. Note that (g) is the end point where the laser beam irradiation ends.

Here, the state of the respective cantilever pieces 15 and 16 of the first and second noise prevention devices 13 and 14 during processing will be explained in detail with reference to FIG. 2, representing one predetermined cantilever piece 15. do.

That is, when the laser beam irradiation is first advanced in an arc shape from the starting point (1) to the right end (ri), the outer slit 18 on the large diameter side is formed.

When the shaft is reversed at a predetermined small radius and moved toward the left in an arc shape, an inner slit 19 on the small diameter side is formed, whereby the left end is fixed to the disc body 11, and the right end is fixed to the disc body 11. An elongated arc-shaped cantilever piece 15 is formed which is separated from this disk body.

In this case, the cantilever piece 15 is formed between the cantilever wall 17 and the main body of the disk body 11 which has a wide area and is difficult to deform due to heat, so that when the inner slit 19 is formed, , the cantilevered piece 15 is heated by the laser beam to open the outer slit 1.
It is expanded and deformed in 8 directions. According to experiments conducted by the present applicant, the arc angle θ of the cantilever piece 15 is set to 90 degrees or more, and the radius of curvature R of the outer circumferential surface 18a of the outer slit 18 is adjusted between the outer circumferential surface 18a and the inner circumferential surface of the inner slit 19. It has been found that when the distance W between the cantilever piece 15 and the outer slit 18 is set to six times or more, the amount of contact between the outer circumferential surface 15-1 of the cantilever piece 15 and the outer circumferential surface 18a of the outer slit 18 becomes a preferable length.

Note that the present invention may be implemented as shown in FIG.

That is, as the above-mentioned first noise prevention device 13, a semicircular arc-shaped holding piece 20 and a linear holding piece 21 are appropriately combined to form a set of alphabets to indicate, for example, the type of circular saw or the name of the manufacturer. The letters rP-A-5J are arranged from the axial center of the disc body 11 toward the outer circumferential direction and the clockwise turning direction. In this case, the traveling direction of laser beam irradiation is rP
- Among A-3J, for example, rPJ is the starting point (1), "S"
Along with making the side the end point (O).

After forming the outer circumferential edge 20a of each arc-shaped holding piece 20 in the same manner as described above, the inner circumferential edge 20b thereof is formed.

In addition, the second noise prevention device 14 described above includes one main winding or right winding cantilever piece 2, as shown in FIG.
2 and 23, and in the same manner as described above, the advancing direction of laser beam irradiation is set so as to form the outer peripheral edges 22a and 23a of the cantilever pieces 22 and 23, and then to form the inner peripheral edges 22b and 23b.

That is, in the cantilever piece 22, the starting point (force) of laser beam irradiation is set on the outer periphery of the disc body 11, and the end point is set at the tooth base 11a, which is separately formed in a sawtooth shape on the outer periphery of the disc body 11. It faces the concave portion 11b. Moreover, in the cantilever piece 23,
It advances from the recessed portion 11b, and its end point (k) is the axial center of the inner peripheral edge 23b.

Note that in the present invention, only one of the first and second noise prevention devices 13 and 14 may be used.

Moreover, the present invention is applied to the inside slits 19 (FIG. 2) of the first and second noise prevention devices 13 and 14.

Or the recess 11 of the inner cutter stand 11a of the cantilever pieces 22 and 23
Slits 22c and 23c (Fig. 3) that open at b
If the portion is filled with a polymeric organic material, for example, a synthetic rubber adhesive, the damping function of the disc body 11 is further enhanced, and the vibration and noise of the disc body 11 can be further reduced.

(Effects of the Invention) As is clear from the above description, a cantilevered side is formed by irradiating a laser beam meanderingly onto a disc body from the large diameter side to the small diameter side in an arc shape that makes one round trip per predetermined wide area. As a result, this cantilever piece is formed in an elongated arc shape between the walls that are difficult to deform due to heat, and due to the heat of the laser beam during formation, the outer peripheral surface of the large diameter side is exposed to a large amount on the wall of the disk body. It will come into contact with.

For this reason, when the circular saw vibrates, the amount of sliding contact between the disc body having different vibration frequencies and each month holding piece increases, and the vibration of the circular saw can be quickly damped.

Moreover, since one cantilever piece is formed per a predetermined wide area, the amount of meandering of the laser beam is shortened, reducing costs and cutting time, that is, the noise prevention device can be quickly obtained. It has the following effects.

[Brief explanation of drawings]

Fig. 1 is a partial side view showing an embodiment of the present invention, Fig. 2 is an enlarged side view of main parts, Fig. 3 is a side view showing another embodiment, and Fig. 4 is a side view showing an embodiment of the present invention.
The figure is a partial side view showing a conventional example, and FIGS. 5(A) to 5(C) are enlarged side views of main parts showing the processing state of the cantilever piece. 1o: Circular saw, 11: Disc body, 12: Grindstone, 13:・14
:1st, 1st! ! IL sound prevention device, 15/16: Cantilever piece, 17: Cantilever piece, 18: Outer slit, 19: Inner slit, (1)/(Force): Starting point, (E)/(K):
the last stop. Application agent Hisashi Matsumoto

Claims (1)

[Claims] 1. A laser beam is applied to the disc body in a meandering manner to cut through the wall of the disc body, forming a long and thin cantilever piece with one end fixed to the disc body and the other end separated from the disc body. In the noise prevention device for a circuit board for a circular saw, the cantilever piece is configured by irradiating a laser beam in a meandering manner on the disc body from the large diameter side to the small diameter side in a reciprocating arc shape per predetermined wide area. A noise prevention device for a circular saw board, characterized in that the board is formed into an elongated arc shape between walls having a predetermined wide area.