Rotary saw reduces noise and vibration

Abstract

To provide a rotary saw which reduces noise.SOLUTION: In a rotary saw having a plurality of disk-like bodies, blade parts provided on the outer peripheries of the disk-like bodies, and slits penetrating front and rear surfaces of the disk-like bodies and having inclined surfaces with respect to the thickness direction of the disk-like bodies, each slit has a meandering passage that is continuous alone, one inclined surface of the meandering passage and the other inclined surface arranged so as to face each other with meandering are formed in the mutually-different directions.SELECTED DRAWING: Figure 1

Description

Detailed Description of the Invention [Technical field]

[0001] The present invention relates to a rotary saw for cutting materials such as wood, metal, stone, etc., and in particular to a rotary saw that can reduce noise generated during cutting processes, a power tool using this rotary saw, and a machine tool equipped with this rotary saw. [Background technology]

[0002] A rotary saw is composed of a disk-shaped base plate (base plate) and multiple blades formed on the outer periphery of the base plate. When this rotary saw is used to cut and process materials such as wood, metal, and stone, noise is generated, which has a significant impact on the surrounding area, and there is a demand for noise reduction and noise improvement.

[0003] The noise generated by a rotary saw is due to the vibration of the saw blade and the workpiece caused by friction between the rotating saw blade and the workpiece. It is difficult to suppress the noise generated by this vibration. In particular, if the vibration caused by the variation in friction between the saw blade and the workpiece coincides with the natural frequency of the rotary saw, the vibration will become large, and the noise will also become large. Various proposals have been made to reduce the noise of rotary saws.

[0004] For example, Japanese Patent Application Laid-Open No. 2000-120777 discloses a circular saw having a vibration damping function. This circular saw has multiple blades around the entire circumference of the circular saw base, and a cemented carbide saw blade is brazed to each blade. This circular saw is characterized by having a slit with a width of 1 mm to 0.1 mm formed in the middle region of the circular saw, and particles are filled into the slit to obtain a vibration-damping effect.

[0005] As a specific configuration, a slit having both ends closed is provided in the middle region of the circular saw base metal, and this slit is filled with magnetized particles. With this configuration, the particles are filled into the slits, so that the particles rub against the sides of the slits or rub against each other, reducing vibration energy and suppressing vibration. In addition, the width of the slits is set to 1mm to 0.1mm, so the particles can enter completely and are less likely to fall out, resulting in a sufficient vibration-damping effect.

[0006] However, when a low-friction material is formed on the surface of a substrate after slits are made in the circular saw alloy and the slits are filled with a viscoelastic material, a problem occurs in that the filler melts due to heating during the formation of the low-friction material. It was also found that if a low-friction material is formed first after making a slit and then filled with a viscoelastic material, the filled material falls out. That is, the viscoelastic material does not adhere firmly to the slit due to the low-friction material formed in the slit, and falls out. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2000-120777 A Summary of the Invention [Problem to be solved by the invention]

[0008] The object of this invention is to provide a rotary saw which solves the problems described above, and which incorporates improvements to the main body of the rotary saw in order to further reduce the noise generated by the rotating disk during cutting. [Means for solving the problem]

[0009] A first invention for achieving the above object is a cutting tool comprising a disk-shaped body, a blade portion on the outer periphery of the disk-shaped body, and a plurality of slits penetrating the front and back surfaces of the disk-shaped body and having inclined surfaces in the thickness direction of the disk-shaped body, each of the slits having a meandering path that is independently continuous, and arranged opposite to each other in a meandering manner. The multiple opposing serpentine paths are Arranged opposite each other by meandering No. 1 The slope of the meandering road, 1. Adjacent and facing each other across the curved section The second meandering The inclined surface, the inclined surface of the second meandering path and the inclined surface of the third meandering path adjacent and opposed to each other across the second curved portion are inclined from one main surface side to the other main surface side of the disk-shaped body so as to approach the direction in which the slit openings of each other on the one main surface side are located; the inclined surface of the third meandering path and the inclined surface of the fourth meandering path adjacent and opposed to each other across the third curved portion are inclined from one main surface side to the other main surface side of the disk-shaped body so as to approach the direction in which the slit openings of each other on the one main surface side are located; and the inclined surface of the fourth meandering path and the inclined surface of the fifth meandering path adjacent and opposed to each other across the fourth curved portion are inclined from one main surface side to the other main surface side of the disk-shaped body so as to move away from the direction in which the slit openings of each other on the one main surface side are located; The slits No. 1 The inclined surface of the meandering path and the The second meandering path Slope of and the inclined surface of the third meandering path, the inclined surface of the fourth meandering path, and the inclined surface of the fifth meandering path. In the above, The above When viewed from the slit opening on one main surface side in a direction perpendicular to the one main surface of the disk-shaped body, The above The slit opening on the other main surface is not visible. In a cross-sectional view including adjacent and opposing meandering paths across a curved portion, a width of the slit opening on the one main surface side and a width of the slit opening on the other main surface side are equal, and the inclined surfaces facing each other within the slit are parallel to each other, a distance between a center of a first other main surface side slit opening connected to the first meandering path and a center of an adjacent second other main surface side slit opening, a distance between a center of a second one main surface side slit opening connected to the second other main surface side slit opening via the second meandering path and a center of an adjacent third one main surface side slit opening, a distance between a center of a third other main surface side slit opening connected to the third one main surface side slit opening via the third meandering path and a center of an adjacent fourth other main surface side slit opening, and a distance between a center of a fourth one main surface side slit opening connected to the fourth other main surface side slit opening via the fourth meandering path. The distance between the center of the slit opening and the center of the adjacent fifth slit opening on the one main surface side decreases in this order. This is a rotary saw characterized by the above.

[0010] A second invention for achieving the above object is an electric power tool comprising a base portion, a circular saw body supported on the base, the circular saw body being constituted by an electric motor, and a rotary saw rotated and driven by the electric motor, the rotary saw comprising a disk-shaped body, a blade portion on the outer periphery of the disk-shaped body, and a plurality of slits penetrating the front and back surfaces of the disk-shaped body and having inclined surfaces in the thickness direction of the disk-shaped body, each of the slits having a meandering path that is independently continuous, and arranged opposite to each other in a meandering manner. The multiple opposing serpentine paths are Arranged opposite each other by meandering No. 1 The slope of the meandering road, 1. Adjacent and facing each other across the curved section The second meandering The inclined surface, the inclined surface of the second meandering path and the inclined surface of the third meandering path adjacent and opposed to each other across the second curved portion are inclined from one main surface side to the other main surface side of the disk-shaped body so as to approach the direction in which the slit openings of each other on the one main surface side are located; the inclined surface of the third meandering path and the inclined surface of the fourth meandering path adjacent and opposed to each other across the third curved portion are inclined from one main surface side to the other main surface side of the disk-shaped body so as to approach the direction in which the slit openings of each other on the one main surface side are located; and the inclined surface of the fourth meandering path and the inclined surface of the fifth meandering path adjacent and opposed to each other across the fourth curved portion are inclined from one main surface side to the other main surface side of the disk-shaped body so as to move away from the direction in which the slit openings of each other on the one main surface side are located; The slits No. 1 The inclined surface of the meandering path and the The second meandering path Slope of and the inclined surface of the third meandering path, the inclined surface of the fourth meandering path, and the inclined surface of the fifth meandering path. In the above, The above When viewed from the slit opening on one main surface side in a direction perpendicular to the one main surface of the disk-shaped body, The above The slit opening on the other main surface is not visible. In a cross-sectional view including adjacent and opposing meandering paths across a curved portion, a width of the slit opening on the one main surface side and a width of the slit opening on the other main surface side are equal, and the inclined surfaces facing each other within the slit are parallel to each other, the distance between the center of the first other main surface side slit opening connected to the first meandering path and the center of the adjacent second other main surface side slit opening, the distance between the center of the second one main surface side slit opening connected to the second other main surface side slit opening via the second meandering path and the center of the adjacent third one main surface side slit opening, the distance between the center of the third other main surface side slit opening connected to the third one main surface side slit opening via the third meandering path and the center of the adjacent fourth other main surface side slit opening, and the distance between the center of the fourth one main surface side slit opening connected to the fourth other main surface side slit opening via the fourth meandering path and the center of the adjacent fifth one main surface side slit opening,The present invention relates to an electric power tool equipped with a rotary saw.

[0011] Furthermore, a third invention for achieving the above object is a machine tool comprising a table on which a workpiece is placed, a rotary saw protruding from a gap in the table, an electric motor for rotating the rotary saw, and cutting the workpiece by relative movement between the table and the rotary saw, the rotary saw comprising a disk-shaped body, a blade portion on the outer periphery of the disk-shaped body, and a plurality of slits penetrating the front and back surfaces of the disk-shaped body and having inclined surfaces in the thickness direction of the disk-shaped body, each of the slits having a meandering path that is independently continuous, and arranged opposite to each other in a meandering manner. The multiple opposing serpentine paths are Arranged opposite each other by meandering No. 1 The slope of the meandering road, 1. Adjacent and facing each other across the curved section The second meandering The inclined surface, the inclined surface of the second meandering path and the inclined surface of the third meandering path adjacent and opposed to each other across the second curved portion are inclined from one main surface side to the other main surface side of the disk-shaped body so as to approach the direction in which the slit openings of each other on the one main surface side are located; the inclined surface of the third meandering path and the inclined surface of the fourth meandering path adjacent and opposed to each other across the third curved portion are inclined from one main surface side to the other main surface side of the disk-shaped body so as to approach the direction in which the slit openings of each other on the one main surface side are located; and the inclined surface of the fourth meandering path and the inclined surface of the fifth meandering path adjacent and opposed to each other across the fourth curved portion are inclined from one main surface side to the other main surface side of the disk-shaped body so as to move away from the direction in which the slit openings of each other on the one main surface side are located; The slits No. 1 The inclined surface of the meandering path and the The second meandering path Slope of and the inclined surface of the third meandering path, the inclined surface of the fourth meandering path, and the inclined surface of the fifth meandering path. In the above, The above When viewed from the slit opening on one main surface side in a direction perpendicular to the one main surface of the disk-shaped body, The above The slit opening on the other main surface is not visible. In a cross-sectional view including adjacent and opposing meandering paths across a curved portion, a width of the slit opening on the one main surface side and a width of the slit opening on the other main surface side are equal, and the inclined surfaces facing each other within the slit are parallel to each other, the distance between the center of the first other main surface side slit opening connected to the first meandering path and the center of the adjacent second other main surface side slit opening, the distance between the center of the second one main surface side slit opening connected to the second other main surface side slit opening via the second meandering path and the center of the adjacent third one main surface side slit opening, the distance between the center of the third other main surface side slit opening connected to the third one main surface side slit opening via the third meandering path and the center of the adjacent fourth other main surface side slit opening, and the distance between the center of the fourth one main surface side slit opening connected to the fourth other main surface side slit opening via the fourth meandering path and the center of the adjacent fifth one main surface side slit opening, The present invention relates to a machine tool equipped with a rotary saw. Effect of the Invention

[0012] According to the present invention, since it is possible to reduce the cutting resistance and vibration resistance, there is an advantage in that the noise generated between the rotary saw and the workpiece to be cut is reduced, enabling a noise reduction effect. [Brief description of the drawings]

[0013] [Figure 1] 1 is a schematic diagram showing an embodiment of a rotary saw according to the present invention; [Diagram 2]1 is a partial cross-sectional view showing an example of a disk-shaped body including a slit of a rotary saw according to the present invention. [Diagram 3] 6 is a partial cross-sectional view showing another example of a disk-shaped body including a slit for a rotary saw according to the present invention; FIG. [Figure 4] 5 is a schematic diagram showing a state in which a slit is formed in the rotary saw according to the present invention; FIG. [Diagram 5] 1 is a schematic perspective view showing a power tool using a rotary saw according to the present invention; [Figure 6] 1 is a perspective view showing one embodiment of a machine tool equipped with a rotary saw according to the present invention; [Figure 7] FIG. 11 is a perspective view showing another embodiment of a machine tool equipped with a rotary saw according to the present invention. BEST MODE FOR CARRYING OUT THEINVENTION

[0014] Hereinafter, the best mode for carrying out the present invention will be described with reference to FIG. 1, a rotary saw body 10 is composed of a disk-shaped body 11 made of stainless steel or the like, and a number of cutting edges 12 formed at regular intervals along the outer periphery of the disk-shaped body 11. A mounting hole 13 is formed in the center of the disk-shaped body 11.

[0015] The disk-shaped body 11 has slits 14 formed in a serpentine shape from its outer periphery toward the inside. A plurality of these slits 14 are formed at positions that can suppress both vibrations propagating radially from the center of the disk-shaped body 11 and vibrations propagating circumferentially around the disk-shaped body 11.

[0016] The disk-shaped body 11 is provided in an intermediate region between the center of the disk-shaped body 11 and the blade portion 12, A slit 15 is provided which penetrates the front and back surfaces of the disk-shaped body 11. Fig. 2 shows an example of a rotary saw according to the present invention, and is a cross-sectional view of the disk-shaped body 11 taken along line AA in Fig. 1, and is a partial cross-sectional view of the disk-shaped body 11 including the slit 15. In Fig. 2, the slits 15 have a meandering path, and the slits 15 are arranged and formed so as to face each other by this meandering path. The slits 15 shown in Fig. 2 have an inclined surface with respect to the thickness direction of the disk-shaped body 11. Specifically, the slits 15 are parallel to each other from the front side 11a to the back side 11b of the disk-shaped body 11.

[0017] As is clear from Figure 2, this slit 15 is configured such that when viewed from the slit opening OP1 on one main surface of the disc-shaped body 11 in a direction perpendicular to the main surface of the disc-shaped body 11, the slit opening OP2 on the other main surface cannot be seen.

[0018] With this configuration, the vibrations of the disc-shaped body 11 caused by friction between the rotary saw body 10 and the workpiece can be damped, and the vibrations propagating along the circumferential direction of the disc-shaped body 11 and the vibrations propagating in the radial direction can be damped, thereby reducing noise. In addition, by damping vibration, the cutting edge involved in cutting or milling passes through the same trajectory with a smaller vibration width. Therefore, the width of the cutting margin does not increase, the variation in the cutting position is reduced, and the replacement cycle of the saw blade can be extended. In addition, in Figure 2, the distance between the center of each slit and the center of the hole of the adjacent slit is d4>d3>d2>d1 as shown in Figure 2, and the distances between each opposing slit are different. In this configuration, noise reduction is possible without filling the viscoelastic resin, but the slits 15 may be filled with a viscoelastic resin. Since the slits 15 are formed in an oblique direction, the amount of resin filled is greater than in slits that are perpendicular to the main surface of the disk-shaped body 11, and a stronger vibration damping effect is achieved. As the viscoelastic resin, polyurethane resin, polyester resin, epoxy resin, etc. are used.

[0019] Fig. 3 shows another example of a rotary saw according to the present invention, and shows a cross-sectional view of the disk-shaped body 11 taken along line AA in Fig. 1, which is a partial cross-sectional view of the disk-shaped body 11 including a slit 15. In Fig. 3, the slit 15 has a meandering path, and the slits 15 arranged opposite each other are formed by this meandering path. The slit 15 shown in Fig. 3 has an inclined surface with respect to the thickness direction of the disk-shaped body 11. Specifically, the slits 15 are non-parallel to each other from the front side 11a to the back side 11b of the disk-shaped body 11.

[0020] As is clear from Fig. 3, this slit 15 is configured such that when viewed from the slit opening OP1 side on one main surface of the disc-shaped body 11 in a direction perpendicular to the main surface of the disc-shaped body 11, the slit opening OP2 on the other main surface cannot be seen. Here, the distance between the center of each slit and the center of the hole of the adjacent slit is d4>d3>d2>d1 as shown in Fig. 3, and the distances between the opposing slits are different.

[0021] With the above-described configuration, similar to the example of the disc-shaped body shown in Figure 2, it is possible to dampen vibrations of the disc-shaped body 11 caused by friction between the rotary saw body 10 and the workpiece, and it is possible to dampen vibrations propagating along the circumferential direction of the disc-shaped body 11 and vibrations propagating in the radial direction, thereby reducing noise. In this configuration, noise reduction is possible without filling the slits with viscoelastic resin, but the slits 15 may be filled with viscoelastic resin. Examples of the viscoelastic resin that can be used include polyurethane resin, polyester resin, and epoxy resin. Although not shown, the slit 15 may be configured by combining the slit 15 shown in FIG. 2 and the slit 15 shown in FIG.

[0022] Next, the manufacture of the rotary saw according to the present invention will be described with reference to FIG. First, prepare the disk-shaped body 11. As the disk-shaped body 11, for example, the following is used. In other words, a disk-shaped body is made of a steel plate material such as alloy tool steel or carbon tool steel, and saw-tooth cutting edges on its outer periphery are formed at equal pitch in the circumferential direction, with each cutting edge being made of a cemented carbide.

[0023] Next, a laser device RE forms a plurality of slits 15 in the disk-shaped body 11 with laser light L. The slits 15 have a shape that combines continuous curves and straight lines, i.e., a meandering path, and are arranged opposite each other along this meandering path. Each slit 15 has an inclined surface with respect to the thickness direction of the disk-shaped body 11, and the inclined surfaces of the slits 15 that face each other are parallel or non-parallel to each other, and are formed to have a width of about 0.2 mm to 0.5 mm. The length of the slits 15 is teeth, It is appropriately selected taking into consideration the strength of the disk-shaped body 11.

[0024] The shape of the slit 15 is serpentine, but in addition to the U-shaped serpentine shown in the figure, it may be, for example, a Z-shaped serpentine. Considering that the vibration of the disk-shaped body 11 propagates in the radial and circumferential directions, at least a part of the slit may extend from the center of the disk-shaped body 11 toward the circumferential edge, and a part may extend along the circumferential direction. This disk-shaped body 11 is subjected to heat treatment such as quenching and tempering, and then subjected to surface grinding. Furthermore, a process of joining cemented carbide to each cutting edge is performed.

[0025] Next, an embodiment of a power tool using this rotary saw will be described. Fig. 5 shows a perspective view of the power tool according to the present invention. The same reference numerals are used to denote the same components shown in Figs. 1 to 3.

[0026] 5, power tool 20 is made up of a base portion 21 on which power tool 20 is placed on the upper surface of a workpiece to be cut, and rotary saw body 10 rotatably attached to base 21. More specifically, rotary saw body 10 is rotatably supported on a rotating shaft (not shown) of motor 24. Motor 24 is rotatably attached to support portion 22 via a cover case 23 that covers the upper part of rotary saw body 10. In addition, reference numeral 25 denotes a handle, which is integrated with the cover case 23 and the motor 24, and allows the rotary saw body 10 to be tilted with the support part 22 as a fulcrum. A safety cover 26 is disposed under the blade portion 12 of the rotating disk-shaped body 11, and rotates in synchronization with the operation of the handle 25. In addition, a parallel guide 27 is set on the base portion 21 so as to be movable in the horizontal direction.

[0027] A gear case (not shown) is provided on the rotary saw body 10 side, and this gear case houses a gear for reducing the rotation of the motor 24. The rotation of the motor 24 is transmitted to the disk-shaped body 11 via the gear, and the workpiece can be cut by the rotation of the disk-shaped body 11.

[0028] Next, the present invention relates to a machine tool equipped with a rotary saw. An embodiment of this machine tool will be described below. FIG. 6 is a perspective view showing one embodiment of a machine tool, and FIG. 7 is a perspective view showing another embodiment of a machine tool.

[0029] First, an embodiment of a machine tool shown in FIG. 6 will be described. In this Figure 6, the machine tool 100 consists of a frame 101 and a table 102. The frame 101 is erected on an installation surface such as a floor, and the frame 101 is equipped with a frame-shaped table 102 on which the workpiece (not shown) is placed.

[0030] An electric saw unit 104 that moves in both directions up and down on a travel track 103 as shown by an arrow Y1 is attached to this table 102. This electric saw unit 104 is equipped with an electric motor 105 and a rotary saw 106 that is rotated by this electric motor 105. This rotary saw 106 uses the rotary saw 10 shown in FIG.

[0031] Also, a moving unit 106 that moves the workpiece in the X1 direction is set on this table 102, as shown in Figure 6. More specifically, this moving unit 106 is equipped with a moving drive section 107 that moves the workpiece in the X1 direction, a pressing and fixing bar 108 that holds down the workpiece, and rails 109. As explained above, this machine tool 100 also uses the rotary saw 10 shown in Figure 1 as the rotary saw 107, which reduces vibration and noise.

[0032] Next, another embodiment of the machine tool shown in FIG. 7 will be described. 7, machine tool 200 is equipped with electric saw unit 202 that moves in both directions as indicated by arrow Y2 on table 201. This electric saw unit 202 is equipped with an electric motor (not shown) and a rotary saw 203 that is rotated by this motor. For this rotary saw 203, rotary saw 10 shown in FIG. 1 is used.

[0033] A moving unit 204 for moving the workpiece W in the X2 direction is set on the table 201 as shown in Fig. 7. More specifically, the moving unit 204 is equipped with a moving drive section 205 for moving the workpiece W in the X2 direction, an encoder 206 for measuring the amount of movement, and a positioning device 207. The table 201 is provided with a groove 208 to allow the cutting edge of the rotary saw 203 to move. With this machine tool 200, the rotary saw 203 uses the rotary saw 10 shown in Fig. 1 as described above, so that vibrations and noise can be reduced.

[0034] Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. It is easy to modify the present invention to other than those shown in the drawings without changing the basic concept of the present invention, and the present invention includes such anticipated modifications within its scope. [Explanation of symbols]

[0035] 10 Rotary saw body 11 Discoid 12 Blade 13 Mounting holes 14 Slit 15 Slit 20 Power tools 21 Base 22 Support part 23 Cover Case 24 Motor 25 Handle

Claims

【Request 1】 In a rotary saw having a disk-shaped body, a blade portion on the outer periphery of the disk-shaped body, and a plurality of slits penetrating the front and back surfaces of the disk-shaped body and having inclined surfaces with respect to the thickness direction of the disk-shaped body, each of the slits has a meandering path that is formed independently and continuously, and the plurality of opposing meandering paths arranged to be opposed to each other by meandering are arranged such that an inclined surface of a first meandering path arranged to be opposed to each other by meandering and an inclined surface of a second meandering path adjacent to each other and opposed to each other across a first curved portion are inclined to each other on the one main surface side from one main surface side to the other main surface side of the disk-shaped body.the inclined surface of the second meandering path and the inclined surface of the third meandering path adjacent and opposed to each other across the second curved portion are inclined from one main surface side to the other main surface side of the disk-shaped body so as to move away from the direction in which the slit openings of each of the first and second meandering paths are located, and the inclined surface of the third meandering path and the inclined surface of the fourth meandering path adjacent and opposed to each other across the third curved portion are inclined from one main surface side to the other main surface side of the disk-shaped body so as to move toward the direction in which the slit openings of each of the first and second meandering paths are located. the inclined surface of the fourth meandering path and the inclined surface of the fifth meandering path adjacent to and facing each other across the fourth curved portion are inclined from one main surface side of the disk-shaped body toward the other main surface side so as to move away from the direction in which the slit openings of each of the slits on the one main surface side are located, and in the inclined surface of the first meandering path, the inclined surface of the second meandering path, the inclined surface of the third meandering path, the inclined surface of the fourth meandering path, and the inclined surface of the fifth meandering path of each of the slits, a rotary saw having a configuration in which the slit opening on the other main surface side cannot be seen when viewed in a perpendicular direction, and in a cross-sectional view including each of the adjacent meandering paths sandwiching a curved portion, the width of the slit opening on the one main surface side and the width of the slit opening on the other main surface side are equal, the inclined surfaces facing each other within the slit are parallel, and the distance between the center of the first other main surface side slit opening connected to the first meandering path and the center of the adjacent second other main surface side slit opening, the distance between the center of the second one main surface side slit opening connected to the second other main surface side slit opening via the second meandering path and the center of the adjacent third one main surface side slit opening, the distance between the center of the third other main surface side slit opening connected to the third one main surface side slit opening via the third meandering path and the center of the adjacent fourth other main surface side slit opening, and the distance between the center of the fourth one main surface side slit opening connected to the fourth other main surface side slit opening via the fourth meandering path and the center of the adjacent fifth one main surface side slit opening. 【Request 2】 In a power tool comprising a base portion and a circular saw body supported on the base portion, the circular saw body being configured with an electric motor and a rotary saw driven to rotate by the electric motor, the rotary saw comprises a disk-shaped body, a blade portion on an outer periphery of the disk-shaped body, and a plurality of slits penetrating front and back surfaces of the disk-shaped body and having inclined surfaces in a thickness direction of the disk-shaped body, each of the slits having a single continuous meandering path, and the plurality of opposing meandering paths arranged opposite to each other by meandering are arranged such that an inclined surface of a first meandering path arranged opposite to each other by meandering and an inclined surface of a second meandering path adjacent to each other and opposed to each other across a first curved portion are inclined to each other in a front-to-back manner. the inclined surface of the second meandering path and the inclined surface of the third meandering path adjacent and opposed to each other across the second curved portion are inclined from the one main surface side to the other main surface side of the disk-shaped body so as to approach the direction in which the slit openings of the one main surface side are located, the inclined surface of the third meandering path and the inclined surface of the fourth meandering path adjacent and opposed to each other across the third curved portion are inclined from the one main surface side to the other main surface side of the disk-shaped body so as to approach the direction in which the slit openings of the one main surface side are located,and an inclined surface of a fifth meandering path adjacent and opposed to each other across a fourth curved portion are inclined from one main surface side to the other main surface side of the disc-shaped body so as to move away from a direction in which each of the slit openings on the one main surface side is located, and in the inclined surface of the first meandering path, the inclined surface of the second meandering path, the inclined surface of the third meandering path, the inclined surface of the fourth meandering path, and the inclined surface of the fifth meandering path of each of the slits, when viewed from the slit opening on the one main surface side of the disc-shaped body in a direction perpendicular to the one main surface of the disc-shaped body, the slit opening on the other main surface side cannot be confirmed, and in a cross-sectional view including each of the meandering paths adjacent and opposed to each other across a curved portion, the width of the slit opening on the one main surface side and the width of the slit opening on the other main surface side are equal, and the inclined surfaces facing each other within the slit are the same. a distance between the center of the first other main surface side slit opening connected to the first serpentine path and the center of the adjacent second other main surface side slit opening, a distance between the center of the second one main surface side slit opening connected to the second other main surface side slit opening via the second serpentine path and the center of the adjacent third one main surface side slit opening, a distance between the center of the third other main surface side slit opening connected to the third one main surface side slit opening via the third serpentine path and the center of the adjacent fourth other main surface side slit opening, and a distance between the center of the fourth one main surface side slit opening connected to the fourth other main surface side slit opening via the fourth serpentine path and the center of the adjacent fifth one main surface side slit opening. 【Request 3】 In a machine tool equipped with a rotary saw, the machine tool comprising a table on which a workpiece is placed, a rotary saw protruding from a gap in the table, and an electric motor for rotating the rotary saw, the rotary saw cutting the workpiece by relative movement between the table and the rotary saw, the rotary saw comprising a disk-shaped body, a blade portion on the outer periphery of the disk-shaped body, and a plurality of slits penetrating the front and back surfaces of the disk-shaped body and having inclined surfaces in the thickness direction of the disk-shaped body, each of the slits having a single continuous meandering path, and a plurality of opposing meandering paths arranged opposite to each other by meandering, the plurality of opposing meandering paths being opposed to each other by meandering, The inclined surface of the first meandering path and the inclined surface of the second meandering path adjacently facing each other across the first curved portion are inclined from one main surface side of the disk-shaped body toward the other main surface side so as to approach the direction in which the slit openings of the one main surface side are located, and the inclined surface of the second meandering path and the inclined surface of the third meandering path adjacently facing each other across the second curved portion are inclined from one main surface side of the disk-shaped body toward the other main surface side so as to move away from the direction in which the slit openings of the one main surface side are located, and the inclined surface of the third meandering path and the inclined surface of the third curved portion are adjacently facing each other across the third curved portion. the inclined surface of the fourth meandering path and the inclined surface of the fifth meandering path adjacent to and facing each other across the fourth curved portion are inclined from one main surface side to the other main surface side of the disk-shaped body so as to approach a direction in which the slit openings on the one main surface side are located, the inclined surface of the fourth meandering path and the inclined surface of the fifth meandering path adjacent to and facing each other across the fourth curved portion are inclined from one main surface side to the other main surface side of the disk-shaped body so as to move away from a direction in which the slit openings on the one main surface side are located, When viewed from the slit opening on the one main surface side of the disc-shaped body in a direction perpendicular to the one main surface of the disc-shaped body on the inclined surface of the path, the slit opening on the other main surface side cannot be confirmed, and in a cross-sectional view including each meandering path adjacent to and facing each other across a curved portion, the width of the slit opening on the one main surface side and the width of the slit opening on the other main surface side are equal, the inclined surfaces facing each other within the slit are parallel to each other, and the distance between the center of the first slit opening on the other main surface side connected to the first meandering path and the center of the adjacent second slit opening on the other main surface side,A machine tool equipped with a rotary saw, characterized in that the distance between the center of the second one main surface side slit opening connected to the second other main surface side slit opening via the second meandering path and the center of the adjacent third one main surface side slit opening, the distance between the center of the third other main surface side slit opening connected to the third one main surface side slit opening via the third meandering path and the center of the adjacent fourth other main surface side slit opening, and the distance between the center of the fourth one main surface side slit opening connected to the fourth other main surface side slit opening via the fourth meandering path and the center of the adjacent fifth one main surface side slit opening, in this order.

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