Circular saw blade

Abstract

The right blade (14), the left blade (13), and the middle blade (12) of the circular saw blade (1) have radially outer front ends (14a, 13a, 12a) near the right, the left, or the center in the thickness direction of the base body (2). A first right cutting edge (14i) of the right blade (14) extends from the front end (14a) to a right end (14c) at a first right angle (14m). A first left cutting edge (14f) extends from the front end (14a) toward a left side face (14df) at a first left angle (14j). A first left shoulder cutting edge (14h) extends from the first left cutting edge (14f) to a left end (14b) at a first left shoulder angle (14k). A second left cutting edge (13f) of the left blade (13) extends from a front end (13a) to a left end (13b) at a second left angle (13j). A second right cutting edge (13g) extends from the front end (13a) toward a right side face (13ef) at a second right angle (13k). A second right shoulder cutting edge (13i) extends from the second right cutting edge (13g) to a right end (13c) at a second right shoulder angle (13m).

Description

TECHNICAL FIELD

[0001] One embodiment of the present disclosure relates to a circular saw blade. The circular saw blade cuts a cut material such as a siding board of a ceramic material used as an outer wall material of a house. BACKGROUND

[0002] The circular saw blade has a disc-shaped base and a plurality of cutting bits joined to an outer periphery of the base. The cutting bits are made of a high-hardness material such as super-hard alloy or polycrystalline diamond (PCD). Thus, in the cutting process of the siding board or the like, the wear of the cutting edge can be suppressed, and the cutting bits can be made long in life.

[0003] As a blade type of such a cutting bit, a flat blade in which a cutting edge of a front end of a radial outer side of the base is horizontal is known. The siding board used as an outer wall material generally has a design surface provided with a concave-convex shape for decoration. In the cutting of the siding board using the circular saw blade having the flat blade, a defect called pattern distortion is easily generated at an end edge of the design surface of the siding board. Thus, the end edge of the cut siding board needs to be repaired with paint or the like.

[0004] The cutting bit disclosed in Laid-Open Utility Model Publication No. 3183126 has a cutting edge of a mountain shape or a trapezoidal shape. A front end of a radial outer side of the cutting edge, that is, an apex of the mountain shape or an upper edge of the trapezoidal shape is located near the center in the thickness direction of the base. Left and right edges of the cutting edge are inclined to the radial outer side as they approach the center in the thickness direction of the base. Thus, the defect such as the pattern distortion generated at the end edge of the cut surface of the cut material can be suppressed. However, the cutting edge line length of each cutting bit becomes longer than that of the flat blade. Thus, the net cutting power increases more than that of the flat blade. Such a circular saw blade is used, for example, mounted on a portable electric circular saw or the like. When the cutting power increases, the number of cuts per charge of the cordless tool decreases.

[0005] The cutting bit disclosed in Laid-Open Utility Model Publication No. 3211231 has a first bit in which a front end of a radial outer side is located on the left in the thickness direction of the base and a second bit in which the front end is located on the right. The two kinds of bits are alternately arranged in the circumferential direction of the base. The left and right edges of the cutting edges of the two kinds of bits are also inclined, and thus the defect such as the pattern distortion of the end edge of the cut surface of the cut material can be suppressed. However, the first and second bits respectively receive cutting resistance biased to the left and right in the thickness direction of the base. Thus, by alternately cutting the cut material with the first and second bits, the base to which each bit is joined is easily periodically vibrated to the left and right. Thus, noise can be generated, the cut surface can be deteriorated, and the net cutting power can be large. SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] As mentioned above, conventional circular saw blade cutting heads have difficulty simultaneously suppressing defects such as pattern deformation in the material being cut, like paneling, and reducing the net cutting force of the circular saw blade. Therefore, there has been a long-standing need for a circular saw blade with a cutting head that can suppress defects in the material being cut and also reduce the net cutting force.

[0008] means for solving problems

[0009] According to one feature of this disclosure, the circular saw blade has a right cutter head, a left cutter head, and a middle cutter head. The right cutter head engages with the outer periphery of the base body, and in such a manner... Figure 3 When viewed from the front of the blade in the direction of rotation, the front end has a radially outward front end located to the right in the thickness direction of the base. The left blade engages with the outer periphery of the base and has a radially outward front end located to the left in the thickness direction of the base. The middle blade engages with the outer periphery of the base and has a radially outward front end near the center in the thickness direction of the base. The right blade has a first right cutting edge extending from the front end to the right end at a first right angle. A first left cutting edge is provided, extending from the front end toward the left side at a first left angle smaller than the first right angle. A first left shoulder cutting edge is provided, extending from the first left cutting edge to the left end at a first left shoulder angle larger than the first left angle. Specifically, the first right angle is the angle between a first reference line extending from the front end of the right blade along the thickness direction of the circular saw blade and the first right cutting edge. The first left angle is the angle between the first reference line and the first left cutting edge. The first left shoulder angle is the angle between a second reference line extending from the left end of the first left cutting edge along the thickness direction of the circular saw blade and the first left shoulder cutting edge.

[0010] The left cutter head has a second left cutting edge extending from the front end to the left end at a second left angle. A second right cutting edge is provided, extending from the front end toward the right side at a second right angle smaller than the second left angle. A second right shoulder cutting edge is provided, extending from the second right cutting edge to the right end at a second right shoulder angle larger than the second right angle. Specifically, the second left angle is the angle between a third reference line extending from the front end of the left cutter head along the thickness direction of the circular saw blade and the second left cutting edge. The second right angle is the angle between the third reference line and the second right cutting edge. The second right shoulder angle is the angle between a fourth reference line extending from the right end of the second right cutting edge along the thickness direction of the circular saw blade and the second right shoulder cutting edge.

[0011] Therefore, the right blade, the left blade, and the middle blade each have a front end, and have an inclined angle at both left and right ends. Also, the right blade and the left blade have a shoulder cutting edge at one end edge, and the shoulder cutting edge has a shoulder angle with a relatively large angle. Therefore, each blade processes a design surface or the like of a wallboard using a cutting edge located near both side surfaces with a relatively large inclined angle. As a result, the end edge of the cutting edge of the blade effectively suppresses the design surface or the like from being chipped. The right blade and the left blade have a first left cutting edge or a second right cutting edge with a relatively gentle angle. Therefore, the cutting edge line length of the entire blade is shortened by the first left cutting edge and the second right cutting edge. Also, the cutting edge line of the first left cutting edge and the second right cutting edge easily intersects with the cutting edge line of the middle blade. Thus, the effective cutting edge line length of the middle blade is shortened. As a result, the net cutting power as a whole is reduced. In addition, each cutting edge of the right blade, the left blade, and the middle blade can be a straight line, a curved line, or a composite line of a straight line and a curved line.

[0012] According to another feature of the present disclosure, the front end of the middle blade is either a mountain shape having an apex or a flat type having a length in the thickness direction of the base. The middle blade has a third right cutting edge extending from the front end to the right end at a third right angle. The middle blade has a third left cutting edge extending from the front end to the left end at a third left angle. The middle blade is arranged so that the outer periphery of the base is located between the right blade and the left blade. In detail, the third right angle is an angle between a fifth reference line extending in the thickness direction of the circular saw blade from the front end of the middle blade and the third right cutting edge. The third left angle is an angle between the fifth reference line and the third left cutting edge.

[0013] Therefore, the front end of the middle blade, whether it is a mountain shape or a flat type, has a cutting edge with an inclined angle at both left and right ends. The right blade receives a larger cutting resistance on the right side than on the left side when cutting a cutting material. Therefore, the right blade exerts a force to the left direction on the base. The left blade receives a larger cutting resistance on the left side than on the right side when cutting a cutting material. Therefore, the left blade exerts a force to the right direction on the base. Assuming that the right blade and the left blade are alternately arranged, the base becomes easily vibrated periodically to the left and right. In this regard, in this feature, the middle blade is arranged between the right blade and the left blade. Therefore, the middle blade suppresses the periodic vibration of the base to the left and right. Alternatively, the middle blade suppresses the amplitude of the vibration from becoming large due to the periodic vibration. As a result, the middle blade reduces the net cutting power or reduces the noise.

[0014] According to another feature of the present disclosure, the angle of the cutting edge of the right end and the left end of each of the right blade and the left blade are identical to each other. The circular saw blade has the plurality of blades of any one of the right blade, the left blade, and the center blade. Thus, the circular saw blade has only three kinds of blades. Therefore, it is possible to suppress the complexity of the manufacturing process of the circular saw blade. Alternatively, it is possible to reduce the cost of the circular saw blade. Alternatively, it is possible to simply analyze the motion simulation of the circular saw blade, and so on. Alternatively, since it is possible to make the angle of the whetstone constant when grinding the three kinds of blades, it is possible to efficiently perform the grinding work. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a front view of the circular saw blade of the first embodiment.

[0016] Figure 2 is an enlarged front view of the portion II in Figure 1

[0017] Figure 3 is a view of each blade of the circular saw blade of the first embodiment as viewed from the front in the direction of rotation.

[0018] Figure 4 is a view in which each blade shown in Figure 3 is overlapped.

[0019] Figure 5 is a front view of the circular saw blade of the second embodiment.

[0020] Figure 6 is a view of each blade of the circular saw blade of the third embodiment as viewed from the front in the direction of rotation.

[0021] Figure 7 is a view in which each blade shown in Figure 6 is overlapped.

[0022] Figure 8 is a view of each blade of the circular saw blade of the second comparative example as viewed from the front in the direction of rotation.

[0023] Figure 9 is a view in which each blade shown in Figure 8 is overlapped.

[0024] Figure 10 is a graph comparing the net cutting power of the circular saw blades.

[0025] Figure 11 is a graph comparing the pattern deformation area of the circular saw blades.

[0026] Figure 12 is a view of each blade of the circular saw blade of the fourth embodiment as viewed from the front in the direction of rotation.

[0027] Figure 13 is a view in which each blade shown in​Figure 12 The diagram shows the overlapping of the various cutting heads.

[0028] Figure 14 This is a diagram showing each blade of the circular saw blade in the fifth embodiment as viewed from the front in the direction of rotation.

[0029] Figure 15 Is to make Figure 14 The diagram shows the overlapping of the various cutting heads.

[0030] Figure 16 This is a diagram showing the individual blades of the circular saw blade in the sixth embodiment as viewed from the front in the direction of rotation.

[0031] Figure 17 Is to make Figure 16 The diagram shows the overlapping of the various cutting heads. Detailed Implementation

[0032] The following detailed description of one embodiment of the present disclosure is based on the accompanying drawings. The same reference numerals will not be repeated in the description, but will instead indicate the same elements having the same function. Figures 1 to 4 The first embodiment of this disclosure will be described. For example... Figure 1 As shown, the circular saw blade 1 has a disc-shaped base 2 and multiple cutting heads 11 engaged with the outer periphery of the base 2. The circular saw blade 1 is mounted rotatably in cutting tools such as a rechargeable battery-powered electric circular saw or a fixed circular saw blade cutter. The circular saw blade 1 rotates the base 2, and the cutting heads 11 form grooves in the material being cut, ultimately cutting the material. The material being cut can be, for example, ceramic materials such as wall panels, or wood and woody materials, resin materials, or composite materials. Alternatively, the material being cut can be ferrous materials such as carbon steel, ordinary structural rolled steel, chromium-molybdenum steel, stainless steel, and cast iron, or non-ferrous metals such as aluminum and aluminum alloys, copper and copper alloys.

[0033] like Figure 1 As shown, a roughly circular mounting hole 3, extending through the thickness direction of the base 2, is provided at the center of the base 2. The rotating shaft of the cutting tool is inserted into the mounting hole 3, and the circular saw blade 1 is mounted on the cutting tool. By rotating the rotating shaft of the cutting tool, the circular saw blade 1 moves... Figure 1 The saw blade 1 rotates clockwise around its center 2a. Multiple protrusions 4, extending radially outward from the periphery of the base 2 at predetermined intervals, are provided. Grooves 5, recessed in the circumferential direction, are formed between adjacent protrusions 4. Each protrusion 4 has a rectangular cutter head seat 6 at its front end in the direction of rotation of the circular saw blade 1. A cutting cutter head 11 engages with the cutter head seat 6. The cutting cutter head 11 is made of, for example, superhard alloy, cermet, or polycrystalline diamond.

[0034] like Figure 1As shown, the cutting head 11 is any one of three types of cutting heads: center cutting head 12, left cutting head 13, and right cutting head 14. The cutting edges of the center cutting head 12, left cutting head 13, and right cutting head 14 are different. For example, the cutting head 11 may have three center cutting heads 12, four left cutting heads 13, and four right cutting heads 14. Any one of the center cutting heads 12, left cutting heads 13, and right cutting heads 14 is attached to the cutting head holder 6. Multiple external slits 7 extending radially inward from the tooth grooves 5 are provided on the disc surface of the base 2. Additionally, multiple meandering vibration-damping slits 8 are provided on the disc surface of the base 2. The external slits 7 and vibration-damping slits 8 may be omitted, or only one of them may be provided.

[0035] like Figure 2 As shown, the cutting head 11, which engages with the base 2, has a rake face 11a in front of the circular saw blade 1 in the direction of rotation. The cutting head 11 has a relief face 11b on the radially outer side of the base 2. A cutting edge 11c is formed at the intersection of the rake face 11a and the relief face 11b. Multiple cutting heads 11 are arranged circumferentially spaced apart by a pitch 15. The pitch 15 is centered on the center 2a of the base 2 (refer to...). Figure 1 The pitch 15 is the angle circumferentially centered on the center 2a. For example, when imagining an imaginary line passing through the center 2a and the cutting edges 11c of each cutting tool 11, the pitch 15 is the angle between adjacent imaginary lines.

[0036] like Figure 1 As shown, the circular saw blade 1 has random tooth pitches 15, each with a different size. A center cutter head 12 is engaged behind the blade in the rotational direction of tooth pitches 15b, 15g, and 15j. A left cutter head 13 is engaged behind the blade in the rotational direction of tooth pitches 15a, 15d, 15f, and 15i. A left cutter head 13 is engaged behind the blade in the rotational direction of tooth pitches 15c, 15e, 15h, and 15k.

[0037] like Figure 3 As shown, the intermediate cutter head 12 has a cutting edge 11c (refer to...) Figure 2The cutting head 12 has two ends, 12b and 12c. When viewed from the front in the direction of rotation of the base 2, the left end 12b is positioned at the left front end with the cutting edge 11c above it. The right end 12c is positioned at the right front end. The cutting head 12 has a left side cutting edge 12d extending radially inward from the left end 12b toward the base 2 and a right side cutting edge 12e extending radially inward from the right end 12c toward the base 2. The left side 12df and the right side 12ef have an inward tilt angle (lateral centripetal angle) of 0° or more and 3° or less relative to the radial direction of the base 2, for example, 30′. With this slight tilt, the contact area between the workpiece and the left side 12df or the right side 12ef is reduced, and the cutting resistance is reduced. Moreover, the left side 12df and the right side 12ef are not excessively tilted relative to the cutting surface of the workpiece, so the machining of the cutting surface can be smooth.

[0038] like Figure 3 As shown, the intermediate cutting head 12 has a front end 12a between the left end 12b and the right end 12c. The front end 12a protrudes radially outward from the center of the base 2 in the thickness direction. The front end 12a is located approximately midway between the left end 12b and the right end 12c in the thickness direction of the base 2. The intermediate cutting head 12 has a third left cutting edge 12f extending from the front end 12a to the left end 12b. The intermediate cutting head 12 has a third right cutting edge 12g extending from the front end 12a to the right end 12c. The third left cutting edge 12f is inclined at a third left angle 12h relative to the thickness direction of the base 2. The third right cutting edge 12g is inclined at a third right angle 12i relative to the thickness direction of the base 2. The third left angle 12h and the third right angle 12i are 30° or more and 60° or less, preferably 40° or more and 50° or less, for example, both are 45°.

[0039] like Figure 3 As shown, the left cutting head 13 is at the cutting edge 11c (refer to...) Figure 2 The left and right front ends of the blade 13 have a left end 13b and a right end 13c. The left blade 13 has a left side cutting edge 13d and a right side cutting edge 13e extending radially inward from the left end 13b and the right end 12c, respectively, towards the base 2. Figure 4 As shown, the left cutting edge 13d and the right cutting edge 13e are formed at the same interval as the left cutting edge 12d and the right cutting edge 12e of the center cutting head 12 and are inclined at the same lateral centripetal angle. Therefore, when viewed from the front in the direction of rotation, the left cutting edge 13d and the right cutting edge 13e overlap with the left cutting edge 12d and the right cutting edge 12e.

[0040] like Figure 3As shown, the left cutting head 13 has a front end 13a between its left end 13b and right end 13c. The front end 13a protrudes radially outward from the center of the base 2 in the thickness direction in a mountain-shaped manner. The front end 13a is positioned closer to the left end 13b in the thickness direction of the base 2 than the right end 13c. The distance between the front end 13a and the left end 13b in the thickness direction of the base 2 is, for example, less than one-third of the distance between the left end 13b and the right end 13c. For example, the distance between the front end 13a and the left end 13b is 0.45 mm. For example, the distance between the front end 13a and the right end 13c is 0.95 mm.

[0041] like Figure 3 As shown, the left cutting head 13 has a second left cutting edge 13f extending from the front end 13a to the left end 13b. The second left cutting edge 13f is inclined at a second left angle 13j relative to the thickness direction of the base body 2. The size of the second left angle 13j is approximately the same as the size of the third left angle 12h of the middle cutting head 12, which is 30° or more and 60° or less, preferably 40° or more and 50° or less, for example, 45°.

[0042] like Figure 3 As shown, the left cutting head 13 has a second right cutting edge 13g extending from the front end 13a toward the right side face 13ef. The second right cutting edge 13g is inclined at a second right angle 13k relative to the thickness direction of the base body 2. The second right angle 13k is smaller than the second left angle 13j, being greater than 0° and less than 40°, preferably greater than 10° and less than 30°, for example, 20°.

[0043] like Figure 3 As shown, the left cutting head 13 has a second right shoulder cutting edge 13i extending from the shoulder edge 13h at the right end of the second right cutting edge 13g to the right end 13c. The second right shoulder cutting edge 13i is inclined with respect to the thickness direction of the base body 2 at a second right shoulder angle 13m. The size of the second right shoulder angle 13m is approximately the same as the size of the third right angle 12i of the middle cutting head, which is 30° or more and 60° or less, preferably 40° or more and 50° or less, for example, 45°.

[0044] like Figure 3 As shown, the right cutting head 14 is formed symmetrically with the left cutting head 13 about the plane passing through the center of the thickness direction of the substrate 2. The right cutting head 14 is at the cutting edge 11c (refer to...) Figure 2 The left and right front ends of the cutter 14 have a left end 14b and a right end 14c. The right cutter head 14 has a left side cutting edge 14d and a right side cutting edge 14e extending radially inward from the left end 14b and the right end 14c, respectively, towards the base 2. Figure 4As shown, the left cutting edge 14d and the right cutting edge 14e are formed at the same interval as the left cutting edge 13d and the right cutting edge 13e of the left cutting head 13 and are inclined at the same lateral angle as the left cutting edge 12d and the right cutting edge 12e of the middle cutting head 12.

[0045] like Figure 3 As shown, the right cutter head 14 has a front end 14a between the left end 14b and the right end 14c. The front end 14a protrudes radially outward from the center of the base 2 in the thickness direction in a mountain-shaped manner. The front end 14a is positioned closer to the right end 14c in the thickness direction of the base 2 than the left end 14b. The distance between the front end 14a and the right end 14c in the thickness direction of the base 2 is, for example, less than one-third of the distance between the left end 14b and the right end 14c.

[0046] like Figure 3 As shown, the right cutting head 14 has a first right cutting edge 14i extending from the front end 14a to the right end 14c. The first right cutting edge 14i is inclined at a first right angle 14m relative to the thickness direction of the base 2. The magnitude of the first right angle 14m is the same as the magnitude of the second left angle 13j of the left cutting head 13. The right cutting head 14 has a first left cutting edge 14f extending from the front end 14a toward the left side face 14df. The first left cutting edge 14f is inclined at a first left angle 14j relative to the thickness direction of the base 2. The first left angle 14j is smaller than the first right angle 14m and is the same as the magnitude of the second right angle 13k of the left cutting head 13. The right cutting head 14 has a first left shoulder cutting edge 14h extending from the shoulder edge 14g at the left end of the first left cutting edge 14f to the left end 14b. The first left shoulder cutting edge 14h is inclined at a first left shoulder angle 14k relative to the thickness direction of the base 2. The magnitude of the first left shoulder angle 14k is the same as the magnitude of the second right shoulder angle 13m of the left cutting head 13.

[0047] like Figure 4As shown, the heights of the front ends 12a, 13a, 14a in the radial direction of the base 2 are the same. The heights of the left ends 13b, 14b and the right ends 13c, 14c in the radial direction of the base 2 are the same, respectively. The heights of the shoulder end edges 13h, 14g in the radial direction of the base 2 are the same. Also, the cutting edges of the left tool head 13 and the right tool head 14 are linearly symmetrical to each other on the left and right centers, and the heights in the radial direction of each other are the same. The left end 12b and the right end 12c of the middle tool head 12 are located at positions more inside in the radial direction of the base 2 than the left end 13b and the right end 13c of the left tool head 13 and the left end 14b and the right end 14c of the right tool head 14. The second left cutting edge 13f and the first left shoulder cutting edge 14h overlap each other when viewed from the front in the direction of rotation. The third left cutting edge 12f is substantially parallel to the second left cutting edge 13f and the first left shoulder cutting edge 14h. The second right shoulder cutting edge 13i and the first right cutting edge 14i overlap each other when viewed from the front in the direction of rotation. The third right cutting edge 12g is substantially parallel to the second right shoulder cutting edge 13i and the first right cutting edge 14i.

[0048] As described above, as Figure 3 As shown, the circular saw blade 1 has the right tool head 14, the left tool head 13, and the middle tool head 12. The right tool head 14 is joined to the outer periphery of the base 2 and has a radially outer front end 14a at a right position in the thickness direction of the base 2. The left tool head 13 is joined to the outer periphery of the base 2 and has a radially outer front end 13a at a left position in the thickness direction of the base 2. The middle tool head 12 is joined to the outer periphery of the base 2 and has a radially outer front end 12a near the center in the thickness direction of the base 2.

[0049] The right tool head 14 has a first right cutting edge 14i extending from the front end 14a to the right end 14c at a first right angle 14m. A first left cutting edge 14f is provided extending from the front end 14a toward the left side face 14df at a first left angle 14j smaller than the first right angle 14m. A first left shoulder cutting edge 14h is provided extending from the first left cutting edge 14f to the left end 14b at a first left shoulder angle 14k larger than the first left angle 14j. The left tool head 13 has a second left cutting edge 13f extending from the front end 13a to the left end 13b at a second left angle 13j. A second right cutting edge 13g is provided extending from the front end 13a toward the right side face 13ef at a second right angle 13k smaller than the second left angle 13j. A second right shoulder cutting edge 13i is provided extending from the second right cutting edge 13g to the right end 13c at a second right shoulder angle 13m larger than the second right angle 13k.

[0050] Therefore, the right cutter head 14, left cutter head 13, and middle cutter head 12 each have front ends 14a, 13a, and 12a, respectively, and tilt angles at the left ends 14b, 13b, and 12b, and the right ends 14c, 13c, and 12c. Furthermore, the right cutter head 14 and the left cutter head 13 each have a first left shoulder cutting edge 14h and a second right shoulder cutting edge 13i at one end edge, with the first left shoulder cutting edge 14h and the second right shoulder cutting edge 13i having relatively large shoulder angles. Therefore, each cutter head 12, 13, and 14 utilizes its cutting edges 12f, 12g, 13i, and 14h located near the two sides with relatively large tilt angles to process the design surfaces of the wall panel. As a result, the end edges of each cutting edge 12f, 12g, 13i, and 14h effectively suppress pattern deformation caused by damage to the design surfaces.

[0051] Furthermore, the right cutting head 14 and the left cutting head 13 have a first left cutting edge 14f or a second right cutting edge 13g with a relatively gentle angle. Therefore, the overall cutting edge length of the left cutting head 13 and the right cutting head 14 is shortened by the first left cutting edge 14f and the second right cutting edge 13g. Moreover, the cutting edge line formed by the first left cutting edge 14f and the second right cutting edge 13g easily intersects with the cutting edge line of the middle cutting head 12. Therefore, the effective cutting edge length of the middle cutting head 12 is shortened. As a result, the net cutting power is reduced. In addition, the cutting edges 12f, 12g, 13f, 13g, 13i, 14f, 14h, and 14i of the right cutting head 14, the left cutting head 13, and the middle cutting head 12 can be straight lines, curves, or composite lines of straight lines and curves.

[0052] like Figure 3 As shown, the front end 12a of the intermediate cutter head 12 is a mountain shape with a apex. The intermediate cutter head 12 has a third right cutting edge 12g extending from the front end 12a to the right end 12c at a third right angle 12i. It also has a third left cutting edge 12f extending from the front end 12a to the left end 12b at a third left angle 12h. The intermediate cutter head 12 is positioned on the outer periphery of the base body 2 between the right cutter head 14 and the left cutter head 13.

[0053] Therefore, the middle tool bit 12 has cutting edges with an inclination angle in the left end 12b and the right end 12c. The right tool bit 14 receives a greater cutting resistance on the right side than on the left side when cutting the work material. Therefore, the right tool bit 14 exerts a force in the left direction on the base 2. The left tool bit 13 receives a greater cutting resistance on the left side than on the right side when cutting the work material. Therefore, the left tool bit 13 exerts a force in the right direction on the base 2. Assuming that the right tool bit 14 and the left tool bit 13 are alternately arranged, the base 2 is easily subjected to periodic vibrations in the left and right directions. In this feature, the middle tool bit 12 is arranged between the right tool bit 14 and the left tool bit 13. Therefore, the middle tool bit 12 suppresses the periodic vibrations of the base 2 in the left and right directions. Alternatively, the middle tool bit 12 suppresses a case where the amplitude of the vibrations is increased due to the periodic vibrations. As a result, the middle tool bit 12 reduces the net cutting power or reduces the noise.

[0054] As shown in Figure 3 , the first right angle 14m of the first right cutting edge 14i and the second right shoulder angle 13m of the second right shoulder cutting edge 13i of the respective right ends 14c, 13c of the right tool bit 14 and the left tool bit 13 are the same as each other. The first left shoulder angle 14k of the first left shoulder cutting edge 14h and the second left angle 13j of the second left cutting edge 13f of the left ends 14b, 13b are the same as each other. The plurality of cutting tool bits 11 possessed by the circular saw blade 1 is any one of the right tool bit 14, the left tool bit 13, and the middle tool bit 12. Therefore, the circular saw blade 1 has only three kinds of cutting tool bits 11. Also, the left and right ends of each tool bit 12, 13, 14 are the same angle. Therefore, it is possible to suppress the complexity of the manufacturing process of the circular saw blade 1. Alternatively, it is possible to reduce the cost of the circular saw blade 1. Alternatively, it is possible to simply analyze the action simulation of the circular saw blade 1 and the like. Alternatively, since it is possible to make the angle of the whetstone constant when grinding the three kinds of cutting tool bits 11, it is possible to efficiently perform the grinding work.

[0055] Next, based on Figure 5 A second embodiment of the present disclosure will be described. The circular saw blade 20 has a pitch 22 different in size from the pitch 15 of the circular saw blade 1 shown in Figure 1 . The number of settings and the arrangement order in the circumferential direction of the middle tool bit 12, the left tool bit 13, and the right tool bit 14 engaged with the base 2 of the circular saw blade 20 are the same as those of the circular saw blade 1. The pitch 22 is equally spaced regardless of the kind of the cutting tool bit 11 provided at both ends in the circumferential direction. In addition, the circular saw blade 20 has a vibration damping slit 21 that meanders in a different shape on the disc surface of the base 2, instead of the vibration damping slit 8 of the circular saw blade 1.

[0056] As described above, as shown in Figure 5As shown, the circular saw blade 20 has the center insert 12, the left insert 13, and the right insert 14. The center insert 12 is disposed on the outer periphery of the base 2 between the left insert 13 and the right insert 14. Therefore, the circular saw blade 20 enables the same effects as the circular saw blade 1 (refer to Figure 1 ) described above.

[0057] Next, a third embodiment of the present disclosure will be described based on Figure 6 , 7 The circular saw blade 30 has a center insert 32 instead of the center insert 12 of the circular saw blade 1 shown in Figure 3 . The cutting insert 31 is any one of the center insert 32, the left insert 13, and the right insert 14. The center insert (12) 32 also has a cutting edge 11c at a portion where the rake face 11a and the relief face 11b intersect, as shown in Figure 2 . As shown in Figure 6 , the center insert 32 has a left end 32b and a right end 32c at the front ends on the left and right of the cutting edge 11c. The center insert 32 has a left side surface edge 32d and a right side surface edge 32e that extend from the left end 32b and the right end 32c, respectively, to the radially inner side of the base 2. The left side surface edge 32d and the right side surface edge 32e overlap the left side surface edges 13d, 14d and the right side surface edges 13e, 14e when viewed from the front in the rotation direction.

[0058] As shown in Figure 6 , the center insert 32 has a front end 32a between the left end 32b and the right end 32c. The front end 32a extends in the thickness direction of the base 2 with a length. The front end 32a is located approximately halfway between the left end 32b and the right end 32c in the thickness direction of the base 2. The left end edge 32f and the right end edge 32h of the center insert 32 are symmetrical to each other with respect to a plane that passes through the center of the thickness direction of the base 2.

[0059] As shown in Figure 6 , the center insert 32 has a third left cutting edge 32g that extends from the left end edge 32f to the left end 32b. The center insert 32 has a third right cutting edge 32i that extends from the right end edge 32h to the right end 32c. The third left cutting edge 32g and the third right cutting edge 32i are inclined at a third left angle 32j and a third right angle 32k with respect to the thickness direction of the base 2. The third left angle 32j and the third right angle 32k are substantially the same size as the second left angle 13j, the first left shoulder angle 14k, or the second right shoulder angle 13m, the first right angle 14m. The third left angle 32j and the third right angle 32k are 30° or more and 60° or less, preferably 40° or more and 50° or less, for example, 45°.

[0060] As shown in Figure 6 , 7As shown, the front end 32a is located at a position higher than the front ends 13a, 14a by a height difference 31a in the radial direction of the base 2. The left end 32b, 13b, 14b and the right end 32c, 13c, 14c are each at the same height in the radial direction of the base 2. The third left cutting edge 32g, the second left cutting edge 13f, and the first left shoulder cutting edge 14h overlap each other as viewed from the front in the direction of rotation. The third right cutting edge 32i, the second right shoulder cutting edge 13i, and the first right cutting edge 14i overlap each other as viewed from the front in the direction of rotation.

[0061] As shown in Figure 10 , 11 , comparative experiments were performed to compare the net cutting power and the pattern deformation area when cutting a cut material using each circular saw blade having a different tool bit. In each circular saw blade, the outer diameter of the base 2 was 125 mm, the blade thickness of the base 2 was 1.5 mm, and the number of teeth was 11. Each cutting tool bit had a rake angle of 10°, and each cutting tool bit was composed of polycrystalline diamond. The distance from the left end to the right end of each cutting tool bit was set to be the same. The front end height (radial position with respect to the center 2a of the base 2) of each tool bit was set to be the same height. The cut material was a ceramic wallboard. Each circular saw blade was rotated at a speed of 5000 rpm to cut the cut material being conveyed at a conveying speed of 3.6 [m / min]. The net cutting power was obtained by subtracting the idling power from the actually measured cutting power. The pattern deformation area was the area (mm 2 ) of the pattern deformation when the cutting distance was 400 mm.

[0062] Figure 10 , Figure 11 The flat circular saw blade shown in Figure 3 has all the cutting tool bits in the shape of the middle tool bit 12. In the circular saw blade of Comparative Example 1, Figure 3 the left tool bit 13 and the right tool bit 14 are alternately arranged in the circumferential direction. In addition, the number of teeth is 11, so one more of the left tool bit 13 and the right tool bit 14 is provided.

[0063] The cutting tool bit 71 of the circular saw blade 70 of Comparative Example 2 is as shown in Figure 8 , Figure 9 . The cutting tool bit 71 is any one of the middle tool bit 32 shown in Figure 6 and the left tool bit 73 and the right tool bit 74 shown in Figure 8 . The left tool bit 73 and the right tool bit 74 are the same as the left tool bit 13 and the right tool bit 14 shown in Figure 3The left cutting head 13 and the right cutting head 14 shown differ in the presence or absence of a second right shoulder cutting edge 13i or a first left shoulder cutting edge 14h. Specifically, the front end 73a, left end 73b, left side cutting edge 73d, right side cutting edge 73e, and second left cutting edge 73f of the left cutting head 73 are configured similarly to the front end 13a, left end 13b, left side cutting edge 13d, right side cutting edge 13e, and second left cutting edge 13f. Similarly, the front end 74a, right end 74c, left side cutting edge 74d, right side cutting edge 74e, and first right cutting edge 74g of the right cutting head 74 are configured similarly to the front end 14a, right end 14c, left side cutting edge 14d, right side cutting edge 14e, and first right cutting edge 14i. The second left cutting edge 73f is inclined relative to the thickness direction of the base 2 at a second left angle 73h, which is the same size as the second left angle 13j. The first right cutting edge 74g is inclined relative to the thickness direction of the substrate 2 at a first right angle 74i, which is the same as the first right angle 14m.

[0064] like Figure 8 As shown, the front end 32a is located at a position that is radially higher than the front ends 73a and 74a by a height difference 71a in the base 2. The left cutting head 73 has a second right cutting edge 73g extending from the front end 73a toward the right end 73c. ​​The second right cutting edge 73g is positioned relative to the thickness direction of the base 2 at a second right angle 13k (refer to...). Figure 3 The right cutter head 74 has a first left cutting edge 74f extending from the front end 74a toward the left end 74b. The first left cutting edge 74f is inclined with respect to the thickness direction of the base 2 at a first left angle 74h of the same magnitude as the first left angle 14j. Figure 9 As shown, the right end 73c and the left end 74b are located radially outward from the base 2 compared to the right ends 32c, 74c or the left ends 32b, 73b. Therefore, the right end 73c and the left end 74b protrude radially outward relative to each cutting edge 32g, 73f, 32i, 74g.

[0065] like Figure 10As shown, the net cutting force generated by the chamfered circular saw blade is approximately 14% greater than that generated by the flat-blade circular saw blade. The cutting edge of the chamfered blade is inclined relative to the thickness direction of the substrate 2. Therefore, it is considered that the cutting edge line length of the chamfered blade is longer than that of the flat-blade blade, resulting in a greater net cutting force. The net cutting force generated by Comparative Product 1 is approximately 13% greater than that of the flat-blade circular saw blade. Comparative Product 1 has a left cutting head 13 and a right cutting head 14 alternately in the circumferential direction. In the left cutting head 13, the cutting resistance is greater on the left side compared to the right side, thus applying a force to the right direction to the substrate 2 during cutting. In the right cutting head 14, the cutting resistance is greater on the right side compared to the left side, thus applying a force to the left direction to the substrate 2 during cutting. Therefore, by alternating cutting of the material by the left cutting head 13 and the right cutting head 14, the substrate 2 easily vibrates periodically in the thickness direction. Thus, it is considered that Comparative Product 1 has a greater net cutting force.

[0066] like Figure 10 As shown, the net cutting force generated by circular saw blade 1 is approximately 5% less than that generated by a flat-blade circular saw blade. (Refer to...) Figure 4 The right cutter head 14 and the left cutter head 13 have a first left cutting edge 14f or a second right cutting edge 13g with a relatively gentle angle. Therefore, the overall cutting edge length of the left cutter head 13 and the right cutter head 14 is shorter. Furthermore, the cutting edge line formed by the first left cutting edge 14f and the second right cutting edge 13g easily intersects with the cutting edge line formed by the third left cutting edge 12f and the third right cutting edge 12g of the middle cutter head 12, which has a larger angle. Therefore, the effective cutting edge length of the middle cutter head 12 is shorter. Consequently, the net cutting force of the circular saw blade 1 is considered low.

[0067] like Figure 10 As shown, the net cutting force generated by the circular saw blade 30 is approximately the same as that generated by a flat-bladed circular saw blade. (Refer to...) Figure 7 When viewed from the front in the direction of rotation, the third left cutting edge 32g, the second left cutting edge 13f, and the first left shoulder cutting edge 14h overlap. When viewed from the front in the direction of rotation, the third right cutting edge 32i, the second right shoulder cutting edge 13i, and the first right cutting edge 14i overlap. Typically, the circular saw blade is fed relative to the workpiece and travels upwards toward the workpiece. Therefore, the cutting edge line of the cutting head behind the workpiece is positioned higher in the diagram than the cutting edge line of the cutting head in the front of the workpiece. Consequently, it is difficult to achieve the intersection of the cutting edge lines of the center cutting head 32, the left cutting head 13, and the right cutting head 14. Therefore, it is considered that the cutting edge line length cannot be effectively shortened, and the reduction in net cutting power is smaller.

[0068] like Figure 10 As shown, the net cutting force generated by comparative product 2 is approximately the same as that generated by circular saw blade 1. (Refer to...) Figure 9The right end 73c and left end 74b of the circular saw blade 70 protrude radially outward relative to the respective cutting edges 32g, 73f, 32i, and 74g. Therefore, the cutting edges of the center cutter 32, left cutter 73, and right cutter 74 are, for example, of the circular saw blade 30 (see reference). Figure 7 The cutting edges of the center cutter head 32, left cutter head 13, and right cutter head 14 are prone to intersecting. Therefore, it is believed that the net cutting power is reduced.

[0069] like Figure 11 As shown, the flat-blade circular saw blade exhibits a larger pattern deformation area compared to other test specimens. The cutting edge of the flat-blade blade relative to the substrate 2 (reference) Figure 3 The thickness direction of the saw blade is not inclined. In other words, the cutting edge of the flat-blade saw is approximately orthogonal to the cut surface of the material being cut. Therefore, when cutting the material at the left and right ends of the cutting edge, pattern deformation is easily generated. The pattern deformation area of ​​the circular saw blade with a mountain-blade and Comparative Product 2 is approximately 20% of that of the circular saw blade with a flat-blade.

[0070] Reference Figure 8 The circular saw blade 70 has a left cutting edge 73 and a right cutting edge 74 with a relatively gentle inclination angle, namely a second right cutting edge 73g or a first left cutting edge 74f. The material is cut using the second right cutting edge 73g and the first left cutting edge 74f, which abut against each other at a relatively large angle relative to the left and right cutting surfaces. Therefore, it is considered that comparative sample 2 cannot effectively suppress pattern deformation.

[0071] like Figure 11 As shown, the pattern deformation area of ​​circular saw blade 1, circular saw blade 30, and comparison product 1 is small enough to be 5mm. 2 Therefore, the cut surface of the material being cut is good. Especially in circular saw blade 1, pattern deformation can be effectively suppressed. Circular saw blade 1, circular saw blade 30, and comparative sample 1 all cut the cut surface of the material being cut with a cutting edge having a relatively large inclination angle. Furthermore, the cut surfaces on the left and right sides are cut by two or three different cutting tips. Therefore, it is considered that pattern deformation can be effectively suppressed. Based on the above experimental results, circular saw blade 1 and circular saw blade 30 can effectively suppress pattern deformation and relatively reduce net cutting power.

[0072] As mentioned above, such as Figure 6 As shown, the circular saw blade 30 has a center cutter head 32, a left cutter head 13, and a right cutter head 14. The front end 32a of the center cutter head 32 is flat and has a length in the thickness direction of the base body 2. The center cutter head 32 has a third right cutting edge 32i extending from the right edge 32h of the front end 32a to the right end 32c at a third right angle 32k. A third left cutting edge 32g is provided extending from the left edge 32f of the front end 32a to the left end 32b at a third left angle 32j. The center cutter head 32 is arranged on the outer periphery of the base body 2 between the left cutter head 13 and the right cutter head 14. The left cutter head 13 and the right cutter head 14 are located on the circular saw blade 1 (see reference).Figure 1 ) have the same structure. Therefore, the same effects as the circular saw blade 1 can be obtained by using the circular saw blade 30.

[0073] Next, based on Figure 12 , Figure 13 , a fourth embodiment of the present disclosure will be described. The circular saw blade 40 has a center bit 42 instead of the center bit 12 of the circular saw blade 1 shown in Figure 3 . The cutting bit 41 is any one of the center bit 42, the left bit 13, and the right bit 14. The center bit 42 has a left end 42b and a right end 42c at the front ends of the left and right of the cutting edge 11c (refer to Figure 2 ). The center bit 42 has a front end 42a between the left end 42b and the right end 42c. The shape of the cutting edge of the center bit 42 is the same as that of the center bit 12. That is, the left side surface edge 42d, the right side surface edge 42e, the third left cutting edge 42f, and the third right cutting edge 42g of the center bit 42 are similarly configured as the left side surface edge 12d, the right side surface edge 12e, the third left cutting edge 12f, and the third right cutting edge 12g of the center bit 12, respectively. The third left angle 42h and the third right angle 42i are the same size as the third left angle 12h and the third right angle 12i, respectively.

[0074] As shown in Figure 12 , Figure 13 , the front end 42a, the left end 42b, and the right end 42c differ from the front end 12a, the left end 12b, and the right end 12c shown in Figure 3 in the height in the radial direction of the base 2. The front end 42a is located at a position lower than the front ends 13a, 14a by a height difference 41a in the radial direction of the base 2. Therefore, the height difference between the left end 42b and the right end 42c and the left end 13b, 14b or the right end 13c, 14c is larger than the height difference between the left end 12b and the right end 12c and the left end 13b, 14b or the right end 13c, 14c.

[0075] As described above, with reference to Figure 3 , Figure 12 , the height of the front end 42a of the center bit 42 in the radial direction of the base 2 is lower than the height of the front end 12a of the center bit 12 in the radial direction of the base 2. Therefore, the effective cutting edge line length of the center bit 42 becomes shorter. On the other hand, the effective cutting edge line length of the left bit 13 and the right bit 14 tends to become longer. For example, by appropriately setting the pitch 15 (refer to Figure 1 ) of each cutting bit 41, the cutting edge line length of each bit 42, 13, 14 as a whole can be shortened. Thereby, the net cutting power becomes smaller. Also, the design surface of a wallboard or the like is machined by each cutting edge 42f, 42g, 13i, 14h located near the two side surfaces having a relatively large inclination angle. Therefore, the same effects as the circular saw blade 1 (refer to Figure 1the same effects as described above.

[0076] Next, based on Figure 14 , Figure 15 a fifth embodiment of the present disclosure will be described. The circular saw blade 50 has a center bit 52 instead of the center bit 12 of the circular saw blade 1 shown in Figure 3 . The cutting bit 51 is any one of the center bit 52, the left bit 13, and the right bit 14. The center bit 52 has a left end 52b and a right end 52c at the front ends of the cutting edges 11c (refer to Figure 2 ) on the left and right. Between the left end 52b and the right end 52c, there is a front end 52a. The shape of the cutting edges of the center bit 52 is the same as that of the center bit 12. That is, the left side surface edge 52d, the right side surface edge 52e, the third left cutting edge 52f, and the third right cutting edge 52g of the center bit 52 are similarly configured as the left side surface edge 12d, the right side surface edge 12e, the third left cutting edge 12f, and the third right cutting edge 12g of the center bit 12, respectively. The third left angle 52h and the third right angle 52i are the same size as the third left angle 12h and the third right angle 12i, respectively.

[0077] As shown in Figure 14 , 15 , the heights of the front end 52a, the left end 52b, and the right end 52c in the radial direction of the base 2 are different from the heights of the front end 12a, the left end 12b, and the right end 12c in the radial direction of the base 2 shown in Figure 3 . The front end 52a is located at a position higher than the front ends 13a and 14a in the radial direction of the base 2 by a height difference 51a. Therefore, the height difference between the left end 52b and the right end 52c and the left end 13b or 14b or the right end 13c or 14c is smaller than the height difference between the left end 12b and the right end 12c and the left end 13b or 14b or the right end 13c or 14c.

[0078] As described above, referring to Figure 3 , Figure 14 , the height of the front end 52a of the center bit 52 in the radial direction of the base 2 is higher than the height of the front end 12a of the center bit 12 in the radial direction of the base 2. Therefore, the effective cutting edge line length of the center bit 52 becomes longer. Therefore, the cutting edge line length of the entire left bit 13 and the entire right bit 14 becomes shorter. As a result, the cutting resistance of the left bit 13 and the right bit 14 against the cut surface of the cut material becomes smaller. Also, the design surface of the wallboard or the like is machined by each cutting edge 52f, 52g, 13i, and 14h located near the two side surfaces having a relatively large inclination angle. Therefore, the circular saw blade 50 can achieve the same effects as the circular saw blade 1 (refer to Figure 1 ) described above.

[0079] Next, based on Figure 16 , Figure 17The sixth embodiment of this disclosure will be described. The circular saw blade 60 has a center cutter head 62 instead of... Figure 3 The circular saw blade 1 shown has a center cutter head 12. The cutting head 61 is any one of the center cutter head 62, left cutter head 13, and right cutter head 14. The center cutter head 62 has a cutting edge 11c (where...). Figure 2 The left and right front ends of the cutting head 62 are respectively a left end 62b and a right end 62c. A front end 62a is located between the left end 62b and the right end 62c. The cutting edge shape of the cutting head 62 is the same as that of the cutting head 12. That is, the left side cutting edge 62d, the right side cutting edge 62e, the third left cutting edge 62f, and the third right cutting edge 62g of the cutting head 62 are constructed in the same manner as the left side cutting edge 12d, the right side cutting edge 12e, the third left cutting edge 12f, and the third right cutting edge 12g of the cutting head 12. The sizes of the third left angle 62h and the third right angle 62i are the same as the sizes of the third left angle 12h and the third right angle 12i, respectively.

[0080] like Figure 16 , Figure 17 As shown, the heights of the front end 62a, left end 62b, and right end 62c in the radial direction of the base 2 are... Figure 3 The front end 12a, left end 12b, and right end 12c shown are at different radial heights in the base 2. The front end 62a is located at a height difference 61a higher than the front ends 13a and 14a in the radial direction of the base 2. Height difference 61a is greater than height difference 51a (see reference). Figure 14 The left ends 62b, 13b, and 14b, and the right ends 62c, 13c, and 14c are all at the same radial height in the base 2. When viewed from the front in the direction of rotation, the third left cutting edge 62f, the second left cutting edge 13f, and the first left shoulder cutting edge 14h overlap each other. When viewed from the front in the direction of rotation, the third right cutting edge 62g, the second right shoulder cutting edge 13i, and the first right cutting edge 14i overlap each other.

[0081] As mentioned above, refer to Figure 14 , Figure 16 The radial height of the front end 62a of the center cutter head 62 in the base body 2 is higher than that of the front end 52a of the center cutter head 52 in the base body 2. Therefore, the effective cutting edge length of the center cutter head 62 is longer, while the effective cutting edge lengths of the left cutter head 13 and the right cutter head 14 are shorter. Furthermore, the cutting edges 62f, 62g, 13i, and 14h located near the two sides with relatively large inclination angles are used to machine the designed surfaces of the wall panel. Therefore, using the circular saw blade 60, it is possible to obtain the same results as the circular saw blade 1 (see reference 1). Figure 1 The same effect as described above.

[0082] Various modifications can be added to the circular saw blade 1, 20, 30, 40, 50, 60 of the above-described embodiment. For example, the circular saw blade 1 having 11 cutting bits 11 is exemplified. Instead, the circular saw blade 1 can have 10 or less or 12 or more cutting bits 11. The circular saw blade 1 having 3 center bits 12, 4 left bits 13, and 4 right bits 14 is exemplified. Instead, the number of each of the center bits 12, left bits 13, and right bits 14 can be changed. For example, the center bits 12 can be provided as 5, and the left bits 13 and right bits 14 can be provided as 2 each. The number of the left bits 13 and right bits 14 can be different. The arrangement order in the circumferential direction of the center bits 12, left bits 13, and right bits 14 can be changed as appropriate.

[0083] The three kinds of cutting bits 11, the center bits 12, left bits 13, and right bits 14 are exemplified. Instead, four or more kinds of cutting bits 11 can be selected. For example, a plurality of cutting bits 11 having the same characteristics as the left bits 13 or a plurality of cutting bits 11 having the same characteristics as the right bits 14 can be provided. The left bits 13 and right bits 14 can be asymmetric with respect to a plane passing through the center of the thickness direction of the base 2. The positions of the front ends 13a of the left bits 13 and the front ends 14a of the right bits 14 in the radial direction of the base 2 can have different heights. Although the circular saw blade 1 in which the total angle of the pitches 15a, 15d, 15f, 15i and the total angle of the pitches 15c, 15e, 15h, 15k are substantially the same is exemplified, each of the pitches 15 can be changed as appropriate.

[0084] The circular saw blade 1 in which the third left angle 12h, second left angle 13j, and first left shoulder angle 14k are the same size, and the third right angle 12i, second right shoulder angle 13m, and first right angle 14m are the same size is exemplified. Instead, for example, the angles of each of the cutting edges can be different. Or the angles of a part of the cutting edges can be different. For the plurality of cutting bits 11 of the same kind, the radial positions of the base 2 can be set to different heights respectively.

[0085] The above-described embodiments explained in detail with reference to the drawings are merely representative examples of the present application and do not limit the present application. The detailed description is intended to teach an individual skilled in the art how to make and use the best mode of the application and is not intended to limit the scope of the application. Additionally, various features and teachings of the present application can be applied and / or used singly or in combination with other features and teachings of the present application to provide improved circular saw blades and / or methods for manufacturing and using the same.

Claims

1. A circular saw blade, wherein, has: a right insert engaged with the outer periphery of the base and having a radially outer front end at a right position in the thickness direction of the base, a left insert engaged with the outer periphery of the base and having a radially outer front end at a left position in the thickness direction of the base, and a center insert engaged with the outer periphery of the base and having a radially outer front end at a position near the center in the thickness direction of the base; the right insert has a first right cutting edge extending from the front end of the right insert to a right end of the right insert at a first right angle, a first left cutting edge extending from the front end of the right insert toward a left side surface of the right insert at a first left angle smaller than the first right angle, and a first left shoulder cutting edge extending from the first left cutting edge to a left end of the right insert at a first left shoulder angle larger than the first left angle, the left insert has a second left cutting edge extending from the front end of the left insert to a left end of the left insert at a second left angle, a second right cutting edge extending from the front end of the left insert toward a right side surface of the left insert at a second right angle smaller than the second left angle, and a second right shoulder cutting edge extending from the second right cutting edge to a right end of the left insert at a second right shoulder angle larger than the second right angle, the first left shoulder cutting edge and the second left cutting edge overlap each other when viewed from the front in the direction of rotation, the first right cutting edge and the second right shoulder cutting edge overlap each other when viewed from the front in the direction of rotation.

2. The circular saw blade according to claim 1, wherein the front end of the center insert is either a mountain shape having an apex or a flat type having a length in the thickness direction of the base, the center insert has a third right cutting edge extending from the front end of the center insert to a right end of the center insert at a third right angle and a third left cutting edge extending from the front end of the center insert to a left end of the center insert at a third left angle, the center insert is disposed between the right insert and the left insert in the outer periphery of the base.

3. The circular saw blade according to claim 1, wherein the angle of the first right cutting edge of the right insert and the angle of the second right shoulder cutting edge of the left insert are the same as each other, and the angle of the first left shoulder cutting edge of the right insert and the angle of the second left cutting edge of the left insert are the same as each other, the plurality of inserts possessed by the circular saw blade are any one of the right insert, the left insert, and the center insert.

4. The circular saw blade according to claim 2, wherein the angle of the first right cutting edge of the right insert and the angle of the second right shoulder cutting edge of the left insert are the same as each other, and the angle of the first left shoulder cutting edge of the right insert and the angle of the second left cutting edge of the left insert are the same as each other, the plurality of inserts possessed by the circular saw blade are any one of the right insert, the left insert, and the center insert.

5. The circular saw blade according to any one of claims 1 to 4, wherein, a plurality of groups of the right insert, the center insert, and the left insert are arranged in the order of the right insert, the center insert, and the left insert, or a plurality of groups of the left insert, the center insert, and the right insert are arranged in the order of the left insert, the center insert, and the right insert, on the entire circumference of the outer periphery of the base.

6. The circular saw blade according to any one of claims 1 to 4, wherein, the first right cutting edge of the right insert is longer than the first left shoulder cutting edge, the second left cutting edge of the left insert is longer than the second right shoulder cutting edge.

7. The circular saw blade according to claim 5, wherein, the first right cutting edge of the right insert is longer than the first left shoulder cutting edge, and the second left cutting edge of the left insert is longer than the second right shoulder cutting edge.

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