Carbide-tipped saw blade

Abstract

To provide a chip saw capable of cutting a workpiece through both normal rotation and reverse rotation and easy in maintenance of a blade tip formed by a cutting chip.SOLUTION: This chip saw comprises: a saw plate 12 rotated normal / reverse about a rotation center Pk to be used; and a plurality of tooth members 14(1) detachably attached at intervals to the outer peripheral edge of the saw plate 12. Each tooth member 14(1) is provided with a body 16(1), and a pair of first and second blade tips 18(1) and 20(1) arranged at both corners on the tip side of the body 16(1). The first and second blade tips 18(1) and 20(1) are formed by cutting chips. In a state where the tooth member 14(1) is attached to a saw plate 26, the first and second blade tips 18(1) and 20(1) project outside the saw plate 12, the first blade tip 18(1) is disposed on the normal-rotation direction side of the saw plate 12, and the seconde blade tip 20(1) is disposed on the reverse-rotation direction side of the saw plate 12.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a chip saw used for cutting hard members having a certain shape stability, such as metals, hard resins, hard rubbers, and woods.

Background Art

[0002] Conventionally, a chip saw for cutting metals, woods, etc. cuts a cutting object by rotating in one direction, and the chips of the saw blade are fixed to the saw plate in a determined rotation direction.

[0003] In addition, the cutting chips of a chip saw that is a circular saw are generally fixed to the tooth part of the saw plate by brazing or welding. However, when brazing or welding the cutting chips, there is a problem that when a specific cutting chip wears or is damaged, it is difficult to remove and replace or grind the cutting chip from the saw plate. Therefore, conventionally, a chip saw with detachable cutting chips has been proposed.

[0004] For example, the chip saw disclosed in Patent Document 1 has a structure in which a predetermined fitting groove is formed in the cutting chip and this fitting groove is inserted and fitted into the tooth-shaped part of the saw plate (saw tooth plate) to be detachable.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Since the rotation direction of the chip saw disclosed in Patent Document 1 and other conventional chip saws is determined, in the cutting operation, a return process after cutting is required, which has been an obstacle to shortening the processing cycle time.

[0007] The present invention is based on the above-mentioned background technology and aims to provide a circular saw blade that can cut workpieces in both forward and reverse rotation and whose cutting edge, made of cutting chips, is easy to maintain. [Means for solving the problem]

[0008] The present invention relates to a circular saw blade used for cutting hard materials having a certain degree of shape stability, comprising a saw blade used by rotating in both forward and reverse directions around a rotation center, and a plurality of tooth members detachably attached at intervals to the outer peripheral edge of the saw blade. The multiple tooth members are independent members that can be individually attached to and detached from the saw plate. The tooth member comprises a main body and a pair of first and second cutting edges disposed at both corners of the tip end of the main body, the first and second cutting edges being formed from cutting tips, and when attached to the saw blade, the first and second cutting edges protrude outward from the saw blade, the first cutting edge is positioned on the forward rotation side of the saw blade, and the second cutting edge is positioned on the reverse rotation side of the saw blade. It is a circular saw blade. .

[0009] The multiple tooth members are, The teeth members attached to the front and back surfaces of the saw blade are arranged alternately in the circumferential direction of the outer edge and are fixed by a predetermined fixing structure. The fixing structure consists of a base end portion of the main body of the tooth member, where the thickness is reduced by providing a step in the thickness direction at a position away from the first and second cutting edges; a screw hole penetrating the inside of the base end portion in the thickness direction; a recess in the thickness direction on one surface of the outer edge of the saw blade; a screw hole penetrating the inside of the recess in the thickness direction; and a screw member. In the assembled state, the main body and the saw blade are arranged so that the base end portion abuts the bottom surface of the recess, their screw holes communicate with each other, and they are fixed to each other by passing the screw member through them. The first and second cutting edges of the tooth member may be formed in pairs at both corners on the tip side of one cutting tip. It is preferable that the main body portion is attached to the saw plate by screw fastening the portion of the main body that is away from the first and second cutting edges to the saw plate.

[0010] Also The present invention relates to a circular saw blade used for cutting hard materials having a certain degree of shape stability, comprising a saw blade used by rotating it in both forward and reverse directions around a rotation center, and a plurality of tooth members detachably attached at intervals to the outer peripheral edge of the saw blade, wherein each tooth member has a main body and a pair of first and second cutting edges arranged at both corners on the tip side of the main body, the first and second cutting edges are formed from cutting tips, and when attached to the saw blade, the first and second cutting edges protrude outward from the saw blade, the first cutting edge is positioned on the forward rotation side of the saw blade, and the second cutting edge is positioned on the reverse rotation side of the saw blade, further, Each of the multiple tooth members is supported by a predetermined support mechanism while attached to the saw plate, the support mechanism pivotally supports the main body so as to be able to swing in the rotational direction of the saw plate, and allows the main body to move between a first position, which is a fixed position tilted toward the reverse rotation direction, and a second position, which is a fixed position tilted toward the forward rotation direction, when the saw plate is rotating forward to cut a workpiece, the tooth members are positioned in the first position due to the cutting resistance acting on them, and the part furthest from the center of rotation becomes the first cutting edge, when the saw plate is rotating backward to cut a workpiece, the tooth members are positioned in the second position due to the cutting resistance acting on them, and the part furthest from the center of rotation becomes the second cutting edge. It is a circular saw blade. .

[0011] In this case, the support mechanism includes an axial hole that penetrates the outer peripheral edge of the saw blade in the thickness direction, a shaft member formed to a thickness that can be placed in the axial hole and to a length such that both ends of itself protrude outward when placed in the axial hole, a first recess formed on one side surface of the main body of the tooth member, and the main body being the First recess It consists of a first screw hole penetrating in the direction of the recess, an auxiliary fixing plate, and a screw member, the auxiliary fixing plate having a second recess formed on one side of the auxiliary fixing plate and a second screw hole penetrating the auxiliary fixing plate in the direction of the recess of the second recess, and in the assembled state the main body and the auxiliary fixing plate are arranged so that they overlap on the two sides of the saw board, the main body and The auxiliary fixing plate Preferably, the first and second screw holes are in communication at positions where the saw plates do not overlap, and the screw members are fixed to each other by passing them through them, and the shaft member is positioned in the shaft hole of the saw plate, with both ends that protrude outside the shaft hole fitting inside the first recess and the second recess, respectively, and is rotatably held by the main body and the auxiliary fixing plate to form the pivot center of the main body.

[0012] Preferably, the first position is the position in which, when the main body is tilted in the reverse rotation direction, the first locking surface, which is formed to span the main body, the auxiliary fixing plate, or both, locks onto the end face of the saw blade, and the second position is the position in which, when the main body is tilted in the forward rotation direction, the second locking surface, which is formed to span the main body, the auxiliary fixing plate, or both, locks onto the end face of the saw blade.

[0013] Alternatively, the tooth member and the support mechanism that supports it may be a single structure that is detachable from the saw plate, and may be attached to the saw plate by screwing a specific part of the support mechanism to the saw plate. Furthermore, it is preferable that the multiple tooth members are arranged alternately in the circumferential direction of the outer edge of the saw plate, with some attached to the front surface and others to the back surface. [Effects of the Invention]

[0014] The saw blade of the present invention cuts the workpiece with its first cutting edge when the saw blade is rotated forward, and cuts the workpiece with its second cutting edge when the saw blade is rotated backward. In other words, it can cut the workpiece in both forward and reverse rotation, thus improving work efficiency in various cutting processes. Moreover, since each tooth component can be individually attached to and detached from the saw blade, maintenance (replacement and grinding) of the cutting edge, which is made of cutting chips, is also easy.

[0015] Furthermore, by configuring the tooth members to be pivotably mounted to the saw blade, when the workpiece is being cut with the first cutting edge in the forward rotation, it is possible to effectively prevent the second cutting edge on the opposite side from contacting the workpiece and wearing it down. Similarly, when the workpiece is being cut with the second cutting edge in the reverse rotation, it is possible to effectively suppress the first cutting edge on the opposite side from contacting the workpiece and wearing it down. [Brief explanation of the drawing]

[0016] [Figure 1] These are a front view (a) and a rear view (b) showing a first embodiment of the saw blade of the present invention. [Figure 2] (a) is an enlarged front view of the tooth member and surrounding area of ​​the saw blade of the first embodiment, and (b) is a front view showing the tooth member removed from the saw blade. [Figure 3] Figure 2(a) shows the mounting structure of the tooth member located in the center, an A1-A1 cross-sectional view (a) and an exploded view of this section (b), and next to it, an A2-A2 cross-sectional view (c) and an exploded view of this section (d). [Figure 4] These are a front view (a) and a rear view (b) showing a second embodiment of the saw blade of the present invention. [Figure 5] (a) is an enlarged front view of the tooth member and its surrounding area of ​​the saw blade in the second embodiment, and (b) is an enlarged front view of the tooth member in the center. [Figure 6] Figure 5(b) shows a front view (a) of the tooth member oscillating to the first position and a front view (b) of the tooth member oscillating to the second position. [Figure 7]Cross-sectional view B1-B1 (a) showing the mounting structure of the tooth member located in the center of Fig. 5(a) and the exploded view (b) of this part, cross-sectional view B2-B2 (c) showing the mounting structure of the adjacent tooth member and the exploded view (d) of this part. [Figure 8] Front view of the cutting chip forming the first and second cutting edges of the chip saw of the first embodiment and its peripheral part, with an enlarged view.

Mode for Carrying Out the Invention

[0017] <Chip saw 10 of the first embodiment> Hereinafter, a first embodiment of the chip saw of the present invention will be described based on Figs. 1 to 3. The chip saw 10 of this embodiment is used for cutting a hard member having a certain shape stability such as metal.

[0018] As shown in Figs. 1(a) and (b), the chip saw 10 includes a disk-shaped saw plate 12 that is used by rotating it forward (clockwise in a front view) and backward (counterclockwise in a front view) about the rotation center Pk, and a plurality of tooth members that are detachably attached to the outer peripheral edge portion of the saw plate 12 at intervals. There are two types of tooth members, and the tooth members 14(1) and 14(2) are alternately arranged in the circumferential direction.

[0019] As shown in Fig. 2(a), the tooth member 14(1) is formed of a substantially pentagonal plate-shaped member and has a main body portion 16(1) and first and second cutting edges 18(1) and 20(1). Specifically, it is manufactured by fixing a cutting chip (cermet chip) having a pair of first and second cutting edges 18(1) and 20(1) formed at both corner portions on the tip side to the tip portion of a substantially pentagonal plate-shaped member, and the base end portions of the plate-shaped member and the cutting chip become the main body portion 16(1) of the tooth member 14(1). Further, as shown in Figs. 3(a) and (b), in the main body portion 16(1), the base end portion 16a(1) away from the first and second cutting edges 18(1) and 20(1) has a reduced thickness due to a step in the thickness direction, and a screw hole is formed inside it.

[0020] On the outer peripheral edge portion of the saw plate 12, on one surface 12a It was dented A recess 12c(1) is provided, and a screw hole is formed inside the recess 12c(1). The tooth member 14(1) is attached to the saw plate 12. The fixed structure is The base portion 16a(1) of the main body 16(1) is brought into contact with the bottom surface of the recess 12c(1) of the saw blade 12, connecting the screw holes to each other, and is then tightly fastened and secured through the screw member 22(1). With the tooth member 14(1) attached to the saw blade 12, as shown in Figure 2(a), the first and second cutting edges 18(1) and 20(1) protrude to the outside of the saw blade 12, with the first cutting edge 18(1) positioned on the forward rotation side of the saw blade 12 and the second cutting edge 20(1) positioned on the reverse rotation side of the saw blade 12. The tooth member 14(1) can also be easily removed from the saw blade 12 by loosening the screw member 22(1).

[0021] As shown in Figures 2(a) and 3(c) and (d), the tooth member 14(2) and its surrounding parts have the same structure as the tooth member 14(1) and its surrounding parts, and when assembled to the saw blade 10, the structure is almost symmetrical with respect to the saw blade 12 as the plane of symmetry. The symbols "**(2)" in Figures 2(a) and 3(c) and (d) correspond to the symbols "**(1)" explained earlier, and the functions of each member and part are the same, so a detailed explanation is omitted.

[0022] The saw blade 10 cuts the workpiece with its first cutting edges 18(1) and 18(2) when the saw blade 12 is rotated forward, and cuts the workpiece with its second cutting edges 20(1) and 20(2) when the saw blade 12 is rotated backward. In other words, it can cut the workpiece in both forward and reverse rotation, which improves work efficiency in various cutting processes. Moreover, since the tooth members 14(1) and 14(2) can be individually attached to and detached from the saw blade 12, maintenance (replacement and grinding) of the cutting edges 18(1), 18(2), 20(1), and 20(2), which are made of cutting tips, is also easy.

[0023] <Circular saw blade 24 of the second embodiment> Next, a second embodiment of the saw blade of the present invention will be described with reference to Figures 4 to 8. The saw blade 24 of this embodiment, like the saw blade 10 described above, is used for cutting hard materials such as metal that have a certain degree of shape stability.

[0024] Before describing the saw blade 24, let's explain the wear of the cutting edge of the saw blade 10 in the above embodiment. The saw blade 10 has a problem in that when the first cutting edge 18(1) is cutting, the second cutting edge 20(1), which does not contribute to the cutting, comes into contact with the bottom surface of the cutting groove of the workpiece and wears down, and when the second cutting edge 20(1) is cutting, the first cutting edge 18(1), which does not contribute to the cutting, also comes into contact with the bottom surface of the cutting groove of the workpiece and wears down.

[0025] Conventional circular saw blades (circular saw blades used only in one direction of rotation) have an appropriate tip relief angle at the cutting edge to prevent the tip relief surface of the cutting edge from contacting the bottom surface of the cutting groove in the workpiece during cutting. However, in the case of circular saw blade 10, as shown in Figure 8, even if the tip relief surface 18a(1) of the first cutting edge 18(1) is set to an appropriate angle, the second cutting edge 20(1) protrudes beyond the tip relief surface 18a(1), so when cutting with the first cutting edge 18(1), the second cutting edge 20(1) comes into contact with the bottom surface of the cutting groove in the workpiece and wears down. Similarly, even if the tip relief surface 20a(1) of the second cutting edge 20(1) is set to an appropriate angle, the first cutting edge 18(1) protrudes beyond the tip relief surface 20a(1), so when cutting with the second cutting edge 20(1), the first cutting edge 18(1) comes into contact with the bottom surface of the cutting groove in the workpiece and wears down.

[0026] In the carbide-tipped saw blade 10, the distance D between the first and second cutting edges is reduced, thereby minimizing the amount each cutting edge protrudes from the relief surface of the opposite cutting edge and suppressing unnecessary friction as much as possible. However, considering the overall strength of the cutting edges, there is a limit to how much the distance D can be reduced, making it difficult to completely eliminate unnecessary friction. Therefore, the configuration of the carbide-tipped saw blade 10 has the drawback of being difficult to use when cutting workpieces with a hardness above a certain level.

[0027] In contrast, the following circular saw blade 24 can easily solve the above-mentioned blade wear problem.

[0028] As shown in Figures 4(a) and 4(b), the saw blade 24 consists of a roughly disc-shaped saw blade 26 that is used by rotating it forward (clockwise when viewed from the front) and backward (counterclockwise when viewed from the front) around a rotation center Pk, and a plurality of tooth members that are detachably attached at intervals to the outer edge of the saw blade 26. There are two types of tooth members, tooth member 28(1) and tooth member 28(2), which are arranged alternately in the circumferential direction and are supported by support mechanisms 30(1) and 30(2), respectively.

[0029] First, the tooth member 28(1) and the support mechanism 30(1) that supports it will be described. As shown in Figures 5(a) and (b), the tooth member 28(1) has a main body 32(1) and first and second cutting edges 34(1) and 36(1). The support mechanism 30(1) pivotally supports the main body 32(1) so that it can swing in the rotational direction of the saw blade 26, and makes the main body 32(1) movable between a first position (Figure 6(a)), which is a fixed position tilted toward the reverse rotation direction, and a second position (Figure 6(b)), which is a fixed position tilted toward the forward rotation direction.

[0030] More specifically, as shown in Figures 7(a) and (b), the tooth member 28(1) has a main body portion 32(1) made of a plate-like member, and the first and second cutting edges 34(1) and 36(1) are formed by fixing a pair of cutting tips (carbide tips) to both corners on the tip side of the main body portion 32(1). In addition, the central portion 32a(1) of the main body portion 32(1), slightly away from the first and second cutting edges 34(1) and 36(1), is slightly thinner due to a step in the thickness direction, and the first screw hole 38(1) is formed inside it. Furthermore, the base portion 32b(1) of the main body portion 32(1), which is located closer to the base end than the central portion 32a(1), is even thinner due to a step in the thickness direction, and the first recess 40(1) is formed inside it with one side recessed.

[0031] In addition, an auxiliary fixing plate 42(1), a shaft member 44(1), and a screw member 46(1) are used as components for attaching the tooth member 28(1) to the saw plate 26. The auxiliary fixing plate 42(1) has a thick portion 42a(1) and a thin portion 42b(1), with a second screw hole 48(1) formed on the inside of the thick portion 42a(1) and a second recess 50(1) formed on the inside of the thin portion 42b(1) with one side recessed.

[0032] The shaft member 44(1) is a member that is placed inside the shaft hole 52 of the saw blade 26. The shaft hole 52 is a through hole formed inside the thin-walled portion 26c provided on the outer peripheral edge of the saw blade 26, and the shaft member 44(1) is a disc-shaped member of a thickness that can be placed inside the shaft hole 52, and is formed to a length such that both ends of itself protrude outward when placed inside the shaft hole 52.

[0033] With the tooth member 28(1) attached to the saw plate 26, the base end portion 32b(1) of the main body portion 32(1) overlaps with one side of the thin portion 26c of the saw plate 26, and the thin portion 42b(1) of the auxiliary fixing plate 42(1) overlaps with the opposite side of the thin portion 26c, and the first and second recesses 40(1) and 50(1) are positioned on both sides of the axial hole 52(1) of the saw plate 26. The central portion 32a(1) of the main body portion 32(1) and the thick portion 42a(1) of the auxiliary fixing plate 42(1) overlap each other, and the screw member 46(1) is passed through the first and second screw holes 38(1) and 48(1) which are communicating with each other, and the main body portion 32(1) and the auxiliary fixing plate 42(1) are fixed to each other by tightening the screw member 46(1) firmly.

[0034] The shaft member 44(1) is positioned inside the shaft hole 52(1) of the saw plate 26, with both ends protruding outside the shaft hole 52(1) fitting inside the first and second recesses 40(1) and 50(1), respectively, and is rotatably held by the main body 32(1) and the auxiliary fixing plate 42(1), becoming the pivot center Py when the main body 32(1) swings.

[0035] As shown in Figures 5(a) and 5(b), the first and second cutting edges 34(1) and 36(1) protrude to the outside of the saw blade 26, with the first cutting edge 34(1) positioned on the forward rotation side of the saw blade 26 and the second cutting edge 36(2) positioned on the reverse rotation side of the saw blade 26. Furthermore, the tooth member 28(1) can be easily removed from the saw blade 26 by loosening the screw member 46(1) and disassembling each component.

[0036] Next, the first and second positions, which are the oscillation limit positions of the tooth member 28(1), will be described. When the main body 32(1) and the auxiliary fixing plate 42(1) are fixed together, a locking surface 54(1) is formed that spans both the main body 32(1) and the auxiliary fixing plate 42(1). In the case of the main body 32(1), the locking surface 54(1) is the surface that connects the surface of the central portion 32a(1) and the surface of the base portion 32b(1) at approximately a right angle. In the case of the auxiliary fixing plate 42(1), the locking surface 54(1) is the surface that connects the surface of the thick portion 42a(1) and the surface of the thin portion 42b(1) at approximately a right angle.

[0037] The locking surface 54(1) works in cooperation with the end face 56(1) of the thin-walled portion 26c of the saw blade 26 to define the first and second positions described above. For example, as shown in Figure 6(a), when the main body 32(1) tilts in the reverse rotation direction, the region of the locking surface 54(1) on the reverse rotation direction side [first locking surface] locks with the end face 56(1), and this position becomes the first position, which is the limit of oscillation of the main body 32(1) in the reverse rotation direction. Also, as shown in Figure 6(b), when the main body 32(1) tilts in the forward rotation direction, the region of the locking surface 54(1) on the forward rotation direction side [second locking surface] locks with the end face 56(1), and this position becomes the second position, which is the limit of oscillation of the main body 32(1) in the forward rotation direction.

[0038] To explain the operation when cutting a workpiece with the saw blade 24, when the saw blade 26 is rotating in the forward direction to cut the workpiece, the tooth member 28(1) is positioned in the first position due to the cutting resistance, and the part furthest from the rotation center Pk becomes the first cutting edge 34(1). At this time, the second cutting edge 36(1) retracts significantly in the direction of the rotation center Pk, so the above-mentioned cutting edge wear problem does not occur. Also, when the saw blade 26 is rotating in the reverse direction to cut the workpiece, the tooth member 28(1) is positioned in the second position due to the cutting resistance, and the part furthest from the rotation center Pk becomes the second cutting edge 36(1). At this time, the first cutting edge 34(1) retracts significantly in the direction of the rotation center Pk, so the above-mentioned cutting edge wear problem does not occur.

[0039] To summarize the components and parts that make up the support mechanism 30(1), the support mechanism 30(1) consists of a shaft hole 52(1) formed in the saw blade 26, a shaft member 44(1), a first recess 40(1) and a first screw hole 38(1) formed in the main body portion 32(1) of the tooth member 28(1), an auxiliary fixing plate 42(1), and a screw member 46(1). The positions of the first and second are determined by the positional relationship between the locking surfaces 54(1) of the main body portion 32(1) and the auxiliary fixing plate 42(1) and the end face 56(1) of the saw blade 26.

[0040] As shown in Figures 5(a) and 7(c) and (d), the tooth member 28(2) and the support mechanism 30(2) are structurally similar to the tooth member 28(1) and the support mechanism 30(1), and when assembled to the saw blade 24, they have a nearly symmetrical structure with respect to the saw blade 26 as the plane of symmetry. The symbols "**(2)" in Figures 5(a) and 7(c) and (d) correspond to the symbols "**(1)" explained earlier, and the functions of each member and part are similar, so a detailed explanation is omitted.

[0041] As described above, the same effects and advantages as those of the above-mentioned saw blade 10 can be obtained with the saw blade 24, and furthermore, the problem of blade wear can be easily solved.

[0042] <Other embodiments and variations, etc.> It should be noted that the carbide-tipped saw blade of the present invention is not limited to the above embodiments. For example, in the carbide-tipped saw blade 10, in order to reduce the distance D between the first and second cutting edges 18(1) and 20(1) of the tooth member 14(1), the first and second cutting edges 18(1) and 20(1) are formed by a single cutting tip. However, if the distance D can be made larger to some extent, the first and second cutting edges 18(1) and 20(1) may be formed by fixing a pair of cutting tips to the main body 16(1), similar to the first and second cutting edges 34(1) and 36(1) of the carbide-tipped saw blade 24. The same applies to the tooth member 14(2). Conversely, if the spacing D between the first and second cutting edges 34(1) and 36(1) of the tooth member 28(1) of the saw blade 24 is to be made smaller, the first and second cutting edges 34(1), 34(1) may be formed with a single cutting tip, similar to the first and second cutting edges 18(1) and 20(1) of the saw blade 10. The same applies to the tooth member 28(2).

[0043] When the tooth member 14(1) of the saw blade 12 is attached to the saw board 12 of the saw blade 10, the main body 16(1) is fastened with a single male screw (screw member 22(1)), but it may also be constructed to fasten with a pair of bolts and nuts. The same applies to the tooth member 14(2). Similarly, when the tooth member 28(1) of the saw blade 12 of the saw blade 24, the support mechanism 30(1) is fastened with a single male screw (screw member 46(1)), but it may also be constructed to fasten with a pair of bolts and nuts. The same applies to the tooth member 28(2).

[0044] The support mechanism 30(1) of the saw blade 24 has a simple and excellent configuration, combining a part of the main body 32(1) of the tooth member 28(1), a predetermined auxiliary plate member 42(1), a shaft member 44(1), and a screw member 46(1). However, it can be changed to a different configuration if the desired effects of the present invention can be obtained. For example, in order to further facilitate the attachment and detachment of the tooth member, the tooth member and the support mechanism that pivotably supports it may be formed as an integrated structure, and a specific part of the support mechanism may be fixed to the saw blade in a detachable manner. In this case as well, it is preferable to fix the specific part of the support mechanism by screw fastening. Screw fastening has the advantage that the tooth member can be firmly fixed to the saw blade when installed, and the tooth member can be easily removed by loosening the screw member.

[0045] Furthermore, the cutting targets of the saw blade of the present invention are hard materials with a certain degree of shape stability, such as metals, ceramic materials, concrete, hard resins, hard rubber, and wood, and the type of hard material is not particularly limited. Also, the material and detailed shape (thickness, tip inclination angle, tip relief angle, rake angle, etc.) of the cutting tip that forms the cutting edge are not particularly limited and can be set appropriately according to the material and shape of the cutting target. [Explanation of Symbols]

[0046] 10.24 Carbide-tipped saw blade 12,26 saw board 14(1), 14(2), 28(1), 28(2) Tooth members 16(1), 16(2), 32(1), 32(2) Main body 18(1),18(2),34(1),34(2) First cutting edge 20(1), 20(2), 36(1), 36(2) Second cutting edge 22(1), 22(2) Screw member 30(1),30(2) Support mechanism 38(1), 38(2) First screw hole 40(1), 40(2) First recess 42(1),42(2) Auxiliary fixing plate 44(1),44(2) Shaft member 46(1), 46(2) Screw component 48(1), 48(2) Second screw hole 50(1), 50(2) Second recess 52(1), 52(2) Shaft hole 54(1), 54(2) Locking surfaces (first and second locking surfaces) 56(1),56(2) End face Pk rotation center Py oscillation center

Claims

1. In a circular saw blade used for cutting hard materials that have a certain degree of shape stability, The saw blade is used by rotating it in both forward and reverse directions around a rotation center, and a plurality of tooth members are attached at intervals to the outer edge of the saw blade, wherein the plurality of tooth members are independent members that can be individually attached to and detached from the saw blade. The tooth member comprises a main body and a pair of first and second cutting edges disposed at both corners on the tip side of the main body, the first and second cutting edges being formed from cutting tips, and when attached to the saw plate, the first and second cutting edges protrude outward from the saw plate, the first cutting edge is positioned on the forward rotation side of the saw plate, and the second cutting edge is positioned on the reverse rotation side of the saw plate. Multiple tooth members are arranged alternately in the circumferential direction of the outer edge of the saw plate, with some attached to the front surface and others to the back surface, and each is fixed by a predetermined fixing structure. The fixing structure comprises a base end portion of the main body of the tooth member, which has a step in the thickness direction at a position away from the first and second cutting edges to reduce its thickness; a screw hole that penetrates the inside of the base end portion in the thickness direction; a recess that is indented in the thickness direction on one side of the outer edge of the saw blade; a screw hole that penetrates the inside of the recess in the thickness direction; and a screw member. In its assembled state, the main body and the saw blade are positioned so that their base ends abut the bottom surface of the recess, their screw holes communicate with each other, and they are fixed together by passing the screw member through them.

2. The first and second cutting edges of the tooth member are formed in a pair at both corners on the tip side of one cutting tip, as in Claim 1.

3. A saw blade used for cutting a hard material having a certain degree of shape stability, The saw blade is used by rotating it in both forward and reverse directions around a rotation center, and it comprises a plurality of tooth members that are detachably attached at intervals to the outer edge of the saw blade. The tooth member comprises a main body and a pair of first and second cutting edges disposed at both corners on the tip side of the main body, the first and second cutting edges being formed from cutting tips, and when attached to the saw plate, the first and second cutting edges protrude outward from the saw plate, the first cutting edge is positioned on the forward rotation side of the saw plate, and the second cutting edge is positioned on the reverse rotation side of the saw plate. The multiple tooth members are each supported by a predetermined support mechanism while attached to the saw plate. The support mechanism pivotally supports the main body so that it can swing in the rotational direction of the saw blade, and makes the main body movable between a first position, which is a fixed position tilted toward the reverse rotation direction, and a second position, which is a fixed position tilted toward the forward rotation direction. A circular saw blade characterized in that, when the saw blade is rotated forward to cut a workpiece, the tooth member is positioned in the first position due to the cutting resistance, and the part furthest from the center of rotation becomes the first cutting edge, and when the saw blade is rotated backward to cut a workpiece, the tooth member is positioned in the second position due to the cutting resistance, and the part furthest from the center of rotation becomes the second cutting edge.

4. The support mechanism comprises an axial hole penetrating the outer peripheral edge of the saw blade in the thickness direction, a shaft member formed to a thickness that can be placed in the axial hole and to a length such that both ends of itself protrude outward when placed in the axial hole, a first recess formed on one side of the main body of the tooth member, a first screw hole penetrating the main body in the direction of the recess of the first recess, an auxiliary fixing plate, and a screw member. The auxiliary fixing plate has a second recess formed on one side of the auxiliary fixing plate and a second screw hole that penetrates the auxiliary fixing plate in the direction of the recess of the second recess. The saw blade according to claim 3, wherein, in the assembled state, the main body and the auxiliary fixing plate are arranged so as to overlap the two sides of the saw plate, the first and second screw holes of the main body and the auxiliary fixing plate are in communication at a position where the saw plate does not overlap, and the screw members are fixed to each other by passing them through, the shaft member is placed in the shaft hole of the saw plate, and both ends that protrude outside the shaft hole are inserted inside the first recess and the second recess, respectively, and are rotatably held by the main body and the auxiliary fixing plate to become the pivot center of the main body.

5. The first position is the position in which, when the main body is tilted in the reverse rotation direction, the first locking surface, which is formed to span the main body, the auxiliary fixing plate, or both, is locked to the end face of the saw plate. The saw blade according to claim 4, wherein the second position is the position in which, when the main body is tilted toward the forward rotation direction, the second locking surface, which is formed to span the main body, the auxiliary fixing plate, or both, is locked to the end face of the saw blade.

6. The saw blade according to claim 3, wherein the tooth member and the support mechanism that supports it constitute a single structure that is detachable from the saw blade, and the saw blade is attached to the saw blade by screw fastening a specific part of the support mechanism to the saw blade.

7. The saw blade according to any one of claims 3 to 6, wherein the plurality of tooth members are attached to the front surface side and attached to the back surface side of the saw blade, and are alternately arranged in the circumferential direction of the outer edge.

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