JPH0929539A - Structure of circular saw tooth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep sharpness of a circular saw tooth for a long time from the beginning by providing notched recesses with prescribed intervals on the circumferential edge face of a cutting blade. SOLUTION: A circular saw blade 1 is provided with a base plate 2 which is formed of a metallic plate of disk shape and a cutting blade 3 in which diamond pieces 5 are mixed provided on the circumferential edge side of the base plate 2. The base plate 2 has a flitting hole 2a on the center side, and slits 2b are formed at the prescribed positions on the circumferential side. The cutting blade 3 is provided between the slits 2b, 2b on the circumferential edge side with the prescribed thickness through sintering, etc., and notched recesses 4 are formed on the circumferential end face with prescribed intervals. When the work is cut, the number of collision of the notched recesses 4 with the work is increased, and the biting to the work is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a circular saw blade used when cutting a work such as concrete, brick, stone or roof tile, and more particularly, to improvement of sharpness and noise reduction of the circular saw blade. It relates to the structure of a circular saw blade with excellent effects.

[Prior art]

2. Description of the Related Art Conventionally, when cutting a work such as concrete or brick, a disk-shaped circular saw blade rotated by a drive motor is used. The circular saw blade has a configuration in which a cutting blade containing diamond grains is provided on the peripheral side of a disk-shaped substrate, and is configured so that sharpness is always improved by self-generated action.

That is, as shown in FIG. 6A, a circular saw blade 41 has a large number of diamond grains D protruding from the surface of the member of the cutting blade 40.
The workpiece is cut and cut by the protruding part of. And
When the work is cut, the cutting blade 40 is worn due to friction with the work or chips, and the sharpness is ensured by the autogenous action in which the projected state of the diamond grains becomes constant. Therefore, the cutting blade 41 is always sharp and can cut the work smoothly while the self-made work is working.

Further, in order to control noise when cutting a workpiece, the circular saw blade substrate portion is formed by laminating thin plates, and the noise reduction effect is enhanced so that generation of noise can be suppressed even a little. Circular saw blades have also been proposed.

[0005]

However, the conventional circular saw blade has the following problems.

As shown in FIG. 6B, the cutting blade of the circular saw blade has the protruding portion of the diamond grain d in a carbon state when the frictional heat becomes too large, and the cutting blade 41
There is a portion that becomes flush with the surface of the member.
Therefore, the frictional heat is further amplified, and the diamond grains d having sound sharpness are also flush with the member surface of the cutting blade 41. As a result, the spontaneous action of the cutting blade 41 does not work, and the cutting of the work becomes impossible.

Further, as shown in FIG. 6 (c), when a large load is applied to the diamond grain d, the exposed portion of the diamond grain d is crushed and a portion having the same surface as the cutting blade 41 is produced. Therefore, the frictional heat increases, the other diamond exposed parts are crushed, or the diamond particles become carbon-like as described above and the part which is flush with the cutting blade surface is enlarged, and the autogenous action of the cutting blade does not work. In any case, the sharpness of the work was significantly reduced.

The substrate portion of the circular saw blade is formed by stacking three thin plates in order to enhance the sound deadening effect. However, since the thin plates are stacked within a predetermined thickness range, compared with a single substrate. The strength is weak and it loses the thrust applied when cutting the work. Therefore, bending of the substrate causes vibration of the rotating circular saw blade, which reduces sharpness. In addition, it is difficult to transmit the thrust required for processing to the cutting blade because the substrate is weak, so that the cutting of the work cannot be performed properly.

Although the circular saw blade substrate is configured to enhance the noise reduction effect, the noise during operation is still large,
A further improvement in the noise reduction effect has been desired. It has been desired to improve the mounting strength of the cutting blade as well as the noise reduction effect.

The present invention was devised in view of the above problems, and maintains the sharpness of a circular saw blade for a long time from the beginning, has a sound deadening effect, and further has a thrust applied to the circular saw blade. It is an object of the present invention to provide a structure of a circular saw blade having a strength capable of appropriately corresponding to the above.

[0011]

In order to achieve the above-mentioned object, the present invention provides a cutting blade formed by mixing diamond grains on the peripheral edge of a disk-shaped substrate and rotated by a drive motor or the like. A circular saw blade for cutting a work such as concrete, which has a structure of a circular saw blade in which cutout recesses are provided at predetermined intervals on the peripheral end surface of the cutting blade. In addition, it is convenient that the cutout recess is formed in a semicircular cross section.

A circular saw blade provided with a cutting blade formed by mixing diamond grains on the peripheral edge of a disk-shaped substrate and rotated by a drive motor or the like to cut a work such as concrete, The circular saw blade substrate is formed by laminating thin plates, and at least one of the laminated thin plates is provided with a perforation hole and has a predetermined curvature from the peripheral end of the substrate toward the inside. Then, it is convenient to adopt a structure of a circular saw blade in which a concavo-convex portion in which spiral winding irregularities are repeated is formed.

Further, the circular saw blade is provided with notched recesses at predetermined intervals on the peripheral end surface of the cutting blade provided on the peripheral side of the substrate of the circular saw plate, and the substrate is formed by laminating thin plates. At the same time, at least one of the laminated thin plates is provided with a perforation hole over the entire surface, and an uneven portion is formed in which the unevenness is repeated in a spiral shape with a predetermined curvature from the peripheral end of the substrate toward the inside. It has a saw blade structure.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a circular saw blade, and FIG. 2 is a sectional view taken along line II-II of FIG.

As shown in FIGS. 1 and 2, a circular saw blade 1
Is provided with a substrate 2 in which a single metal plate is formed in a disc shape, and a cutting blade 3 provided on the peripheral side of the substrate 2 and mixed with diamond grains 5. The substrate 2 has a mounting hole 2a on the center side and a slit 2b at a predetermined position on the circumferential side. Further, the cutting blade 3 is provided on the peripheral edge side of the substrate 2 between the slits 2b, 2b by a means such as sintering to a predetermined thickness, and notch recesses 4 are formed at regular intervals at the peripheral end face position. .

The notch recesses 4 have their installation intervals and sizes determined according to the size of the circular saw blade 1 and the type of work. For example, the circular saw blade 1 has a diameter of 105 cm, and the work is concrete or the like. When it is a stone material, it is convenient to form the notch recess 4 with a radius of 0.8 R (cm) and to provide it at intervals of 6 degrees from the center. Of course, the radius of the cutout recess 4 is 0.5 to 5 because the diameter of the work and the circular saw blade 1 are different.
It may be determined within the range of 4 to 20 degrees from the center within 1.5 R (cm).

Therefore, the circular saw blade 1 having the above-mentioned structure is rotated by a drive motor or the like, and a work such as concrete, tile, thick plate glass, roof tile, brick, block, thin steel plate, fume pipe, curbstone, pavement board, asphalt, etc. When cutting the, since the cutting blade has the notch recess 4 formed,
The notch concave portion 4 increases the number of collisions with the work, and the cutting contact of the circular saw blade 1 with the work is strengthened. Furthermore, since the diamond grains 5 are exposed on the surface of the cutting blade 3 at a predetermined density, the self-propelling action works properly.

Next, a case where the substrate is made of a thin plate will be described. As shown in FIGS. 3, 4 and 5, the substrate 12 is formed by laminating thin plates 18a, 18b and 18c. Then, the substrate 12 is configured to include concave and convex portions 16 and 17 that repeat spiral irregularities with a predetermined curvature from the peripheral side toward the inside. These uneven portions 1
As shown in FIG. 3, the installation gaps 6 and 17 are configured to be formed at regular intervals from the top of the concave section 16 to the top of the convex section 17 in the circumferential direction of the substrate 12.

As shown in FIG. 5, a plurality of laminated thin plates 18a, 18b, 18c are preferably constructed such that a large number of perforation holes 18d are formed at least over the entire surface thereof. That is, with the thin plate 18a having the perforated hole 18d in the middle, the other thin plates 18b, 18
By forming the substrate 12 by abutting and joining c, it is possible to enhance the noise reduction effect and increase the installation strength of the cutting blade 13 on the substrate 12.

As shown in FIG. 5, the drilling holes 18d on the entire surface of the thin plate 18a, except for the peripheral side where the cutting blades 13 are provided, enhance the sound deadening effect because the drilling holes 18d absorb the cutting noise. The hole 18d on the side on which the cutting blade 13 is provided has the cutting blade 1
When 3 is provided, the member of the cutting blade 13 enters the hole 18d, whereby the installation strength of the cutting blade 13 can be increased.

In the drawing, the thin plates 18a, 18b, 18
c has a structure in which three sheets are laminated, but since the thickness of the entire substrate changes due to the diameter of the circular saw blade 10 and the thickness of the cutting blade 13, the thickness within the determined thickness range. The number of laminated layers may be increased to four or five, and the number of thin plates having the perforation holes 18d may be two or more.

Further, as shown in FIG. 3, it is convenient that the peripheral edge surface of the cutting blade 13 is provided with notched concave portions 14 having a semicircular cross section at regular intervals. Of course, substrate 1
The structure of the cutting blade 13 does not matter as long as the purpose is only to improve the sound deadening effect of No. 2 and the installation strength of the cutting blade 13. As shown in FIG. 3, the notch recess 14
In the drawing, the cross-sectional shape is formed in a semicircle, but it may be triangular, square, or trapezoidal. Further, in the plane portion of the cutting blade 13, a groove 13 a continuous with the notch recess 4 is formed every other notch 4. Then, the groove portion 13a is formed in the substrate 12
It is desirable that the incline corresponds to the position of the recessed portion 16 provided in and is inclined in a state close to the curvature of the vortex winding.

Therefore, when the circular saw blade 10 of FIG. 3 is rotated by a drive motor or the like to cut a work such as concrete, the substrate 12 has a thin plate 18a having a hole 18d. Therefore, the noise generated at the time of cutting is absorbed in the perforation hole 18d within an allowable range, so that the noise can be minimized. Of course, the substrate 12
Since the spirally wound uneven portions 16 and 17 are formed,
The thrust force applied to the circular saw blade 1 is not lost, and the force can be appropriately applied to the work side.

Further, so-called biting with respect to the work is good due to the notch recess 14 provided on the peripheral end surface of the cutting blade 13, and the work can be appropriately cut by exposing the diamond grains 15. Further, since the member of the cutting blade 13 is inserted into the hole 18d, the installation strength of the cutting blade 13 is strong and so-called chip fly does not occur. Since the substrate 12 has the uneven portions 16 and 17, the air flows along the spirally-shaped uneven portions 16 and 17 by rotating, and the air flows from the work due to the air flow. Swarf is properly discharged.

The circular saw blade can be used as a small drive cutter that can be operated by an operator with one hand, a drive cutter that is used by an operator who holds the handle portion with both hands, or a road cutting cutter for road cutting. Regardless of the structure of the drive unit that drives the circular saw blade, it is applicable as long as the circular saw blade is rotated to cut a workpiece such as concrete.

[0026]

EXAMPLE When the circular saw blade 1 is formed, the following procedure is performed. First, the substrate 2 is formed by forming a metal plate into a disk having a predetermined size and forming a mounting hole 2a that can be mounted on a drive motor or the like on the center side of the disk. Next, the cutting blade 3 is provided on the periphery of this substrate.

When the cutting blade 3 is formed, the notch recess 4 is also formed in the peripheral end surface thereof. That is, by cold pressing the grit particles and diamond particles of the cutting blade 3 with a die having the shape of the cutout concave portion 4, they are attached to the peripheral edge of the substrate 2 and integrally sintered, laser welded or brazed. By doing the above, it is provided on the periphery of the substrate 4. The substrate 2 has been described as a segment type (with slits) in the drawings, but may have a rim type (without slits). Further, in the drawing, the cross-sectional shape of the cutout recess 4 is a semicircular shape,
It may be a triangle (configuration with the apex side facing the center point), a quadrangle, or a trapezoid (configuration with the short side facing the center).

When the substrate 12 is formed by laminating thin plates like the circular saw blade 10 shown in FIGS. 3 and 4, first,
The thin plates 18a, 18b, 18c are formed in a disk shape, and a mounting hole 12a for a drive motor or the like is formed on the center side. Then, the thin plate 18a, 18b, 18c is formed into a single substrate by spot welding or the like to form the substrate 12. At this time, a member such as SS steel is used so that the thin plates 18a, 18b, 18c are not distorted. In addition,
If necessary, a hole 18d is formed in the entire surface of the thin plate 18a which is the center of the substrate 12. Next, a cutting blade 13 having a predetermined shape is provided on the peripheral edge of the substrate 12. When the cutting blade 13 is provided, the circular saw blade 10 is formed by performing cold pressing as described above and then fixing the cutting blade 13 by means such as sintering.

[0029]

The present invention has the following advantages because it is configured as described above. Since the concave portions are formed at predetermined intervals on the circumferential end surface of the circular saw blade, the sharpness of the circular saw blade can be maintained. Also, even if the cutting promoting member such as diamond grains of the circular saw blade cannot perform self-generated due to excessive friction heat, etc., since the concave portion is formed on the circumferential end surface of the circular saw blade, ,
Since the recess receives different stresses from the work, the self-generated action acts on the cutting blade of the circular saw blade, so that the sharpness of the circular saw blade is not impaired.

The cutting blade provided on the peripheral edge of the substrate can appropriately respond to the stress applied to the notched recess by making the shape of the notched recesses provided at the peripheral end surface at a constant interval have a semicircular cross section. Will not be damaged.

Since the perforation holes are provided over the entire surface of at least one of the laminated thin plates, it is possible to enhance the sound deadening effect during the operation of the circular saw blade. Further, as for the strength of the substrate, since the concavo-convex portion is formed in a spiral shape, it is possible to secure sufficient strength against the thrust of the circular saw blade. In addition, the components that make up the cutting blade enter the perforated hole provided in the thin plate on the side where the cutting blade is provided, and the installation strength of the cutting blade can be increased. Can be used for

The substrates are laminated with thin plates, perforation holes are provided in one of the thin plates, and spiral-shaped uneven parts are formed on the substrate composed of the thin plates, and recesses are formed at regular intervals on the peripheral end surface of the cutting blade. Therefore, the sound deadening effect is excellent, the installation strength of the cutting blade is enhanced, and the self-generated effect of the diamond grains mixed in the cutting blade can be promoted, and the sharpness can be maintained.

[Brief description of drawings]

FIG. 1 is a front view of a circular saw blade according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a front view of a circular saw blade when the substrates of the present invention are laminated by thin plates.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is an enlarged cross-sectional view showing a main part of a circular saw blade in a state where the substrate of the present invention is formed of a thin plate.

FIG. 6 is a cross-sectional view showing the principle of the spontaneous action of diamond grains of a conventional circular saw blade.

[Explanation of symbols]

 1, 10 Circular saw blade 2, 12 Substrate 2a, 12a Mounting hole 2b Slit 3, 13 Cutting blade 4, 14 Notch recess 5, 5 Diamond grain 13a Groove 16 Recess 17 Convex 18a Thin plate 18b Thin plate 18c Thin plate 18d Drilling hole

Claims (4)

[Claims] 1. A circular saw blade which is provided with a cutting blade formed by mixing diamond grains on the periphery of a disk-shaped substrate, and which is rotated by a drive motor or the like to cut a work such as concrete. A circular saw blade structure characterized in that cutout recesses are provided at predetermined intervals on the circumferential end surface of the cutting blade. 2. The structure of a circular saw blade according to claim 1, wherein the cutout recess is formed in a semicircular cross section. 3. A circular saw blade which is provided with a cutting blade formed by mixing diamond grains on the peripheral edge of a disk-shaped substrate and which is rotated by a drive motor or the like to cut a work such as concrete. The circular saw blade substrate is formed by laminating thin plates, and at least one of the laminated thin plates is provided with a perforation hole and has a predetermined curvature from the peripheral end of the substrate toward the inside. Then, the structure of the circular saw blade that has the irregularities that repeat the spiral spiral irregularities. 4. A circular saw blade which is provided with a cutting blade formed by mixing diamond grains on the peripheral edge of a disk-shaped substrate and which is rotated by a drive motor or the like to cut a work such as concrete. On the peripheral end face of the cutting blade, notch recesses are provided at predetermined intervals, the substrate is formed by laminating thin plates, and at least one drilling hole is provided over the entire surface of the laminating thin plates, and A structure of a circular saw blade in which a concavo-convex portion is formed, which has a predetermined curvature from the peripheral edge of the substrate toward the inner side, and repeats spiral-shaped irregularities.