JP2000061727A - Saw blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve working efficiency and make the cutting face favorable by providing a main cutting blade and a sub-cutting blade on each tip. SOLUTION: Cutting off or cutting is mainly performed by a main cutting blade 2 on the forward in the rotating direction or on the cuter circumferential side, at this time a sub-cutting blade 3 bears finishing, and hence finishing work can be performed simultaneously with cutting off cutting. Even if the main cutting blade 2 is abraded, the sub-cutting blade acts the role of the main cutting blade 2 up to the time, and hence the working can be continued. In the case of having a plurality of the sub-cutting blades 3, the finishing work can be simultaneously performed even in the case. In this way, by letting the sub-cutting blade bear finishing, finishing work can be performed simultaneously with cutting-off, the working efficiency can be improved, in addition favorable cutting face can be obtained, further even if one cutting blade is abraded, working can be continued by the other cutting blade, and hence the life of the tool can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary saw blade mainly used for cutting or end face cutting of soft metal materials such as copper and aluminum, and composite materials such as plastic, wood and copper clad laminate. It is a thing.

[0002]

2. Description of the Related Art As a saw blade which can be used in the above-mentioned applications, Japanese Patent Laid-Open No. 8-281606 discloses that the tip of a blade having a lower blade length projects laterally from the tip of a blade having a higher blade length. A staggered blade type saw is shown in Japanese Patent Application Laid-Open No. 8-
In Japanese Patent No. 187702, six types of blades are projected in the radial direction, and the projection positions in the thickness direction are different from each other.

[0003]

By the way, a rotary saw blade (round blade) is used for cutting or end face cutting of soft metal materials such as copper and aluminum, and composite materials such as plastic, wood and copper clad laminate. Although it is considered that a saw blade can be effectively used, there are the following problems in cutting such a material with a circular saw blade.

That is, when it is intended to obtain a product having good end face quality by cutting, usually two processes of cutting and end face finishing are required, resulting in poor working efficiency. Also,
In order to obtain a good cutting surface using only a circular saw blade, there are staggered blades and combination blades as described above, but in the case of large diameter tools, it is necessary to make the precision variation of each tip small. Due to the difficulty, it is difficult to obtain a good cut surface.

The present invention has been made in view of the above points, and an object of the present invention is to provide a saw blade which has good working efficiency and can obtain a good cutting surface.

[0006]

SUMMARY OF THE INVENTION The present invention, however, provides a saw blade in which a plurality of chips are arranged on the outer peripheral portion of a disc-shaped tool.
The feature is that each chip is provided with a main cutting edge and a sub cutting edge. By allowing the auxiliary cutting edge to carry out the finishing process, the finishing process can be performed simultaneously with the cutting, and even if one of the cutting edges wears, the other cutting edge can perform the processing.

At this time, the main cutting edge and the sub cutting edge are arranged side by side in at least one of the tool circumferential direction and the radial direction, and the projecting amount of both cutting edges in the tool circumferential direction or the side direction. The same can be preferably used.

It is preferable that each cutting edge is composed of one block having the same shape and is laminated and joined one block at a time. Further, each block is laminated by a fixing means such as an adhesive, and one block is formed. It may be removable every time.

A superhard material such as sintered diamond may be bonded and bonded to the cutting edge portion in the outer peripheral direction of the tool, the side surface direction, or both.

Further, the main cutting edge and the sub cutting edge are arranged side by side in the circumferential direction of the tool or in the radial direction or both of them.
The auxiliary cutting edge may project from the main cutting edge in the tool side surface direction, the radial direction, or both.

In this case, it is preferable to provide a plurality of sub-cutting edges having a protrusion amount larger than that of the main cutting edges, and it is also preferable that the sub-cutting edges are detachably fitted and fixed to the tool base metal.

A groove having the cutting edge ridgeline as an end may be provided on the main cutting edge flank.

The sub-cutting edge may be inserted into a recess provided in the tool base metal, and the amount of protrusion from the recess may be variable.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION When the present invention is described in detail based on an example of an embodiment, a saw blade according to the present invention is a disk made of a steel material such as carbon steel or high speed tool steel as shown in FIG. A saw blade in which a tip 11 which is a sintered body of high hardness such as diamond is fixed to a base metal 10 on the outer periphery of a tool 1 by brazing or the like, and each tip 11 has a main cutting edge 2 and a sub cutting edge. 3 and 3 are provided.

The main cutting edge 2 and the sub cutting edge 3 have a rake angle of
The clearance angle, the circumferential angle, and the centripetal angle are given (the lead angle is also given depending on the shape of the base metal 10), but these are the same in the main cutting edge 2 and the sub cutting edge 3. I am doing it.

In FIG. 1, the main cutting edge 2 and the sub cutting edge 3 are arranged in the circumferential direction, but they are arranged in the radial direction as shown in FIG. 2 (a). May be
Further, as shown in FIGS. 2A and 2B, a plurality of sub cutting edges 3 may be provided. In any case, the auxiliary cutting edge 3 and the main cutting edge 2 have the same shape in the outer peripheral direction and the side surface direction.

The cutting and cutting are mainly performed by the main cutting edge 3 located in the front side or the outer peripheral side in the rotation direction. At this time, the sub cutting edge 3 is responsible for finishing, so that the cutting and cutting are finished at the same time. Processing can also be performed. Also, the main cutting edge 2
Even if it is worn, the auxiliary cutting edge 3 can serve as the main cutting edge 2 until then, so that machining can be performed. When the auxiliary cutting edge 3 is provided in plural, the finishing process can be simultaneously performed at this time.

In the embodiment shown in FIGS. 1 and 2, the main cutting edge 2 and the sub cutting edge 3 are formed on a single chip 11. However, as shown in FIG. Each block is formed as a block and these blocks are stacked and joined together to form a base metal 1
It may be brazed to 0. It becomes easy to align a plurality of cutting edges. The main cutting edge 2 and the sub cutting edge may be formed by laminating the high-hardness sintered bodies having the same shape and then laminating.

When stacking and joining blocks,
As shown in FIG. 4, the base metal 10 is sequentially laminated on the outer peripheral surface and fixed by a fixing means such as an adhesive. If the main cutting edge 2 is worn and becomes unusable, a solvent is removed. It may be used to be able to remove worn cutting edges. After removing the main cutting edge 2, the sub cutting edge 3 up to that point is used as the main cutting edge 2.
Of course, the worn cutting edge (block thereof) may be removed by using a dedicated jig.

FIG. 5 shows a cutting edge formed of a multi-layer body in which a diamond surface layer is bonded to a central portion 4 made of a long hard material, and in this case, the chip 11 is manufactured at low cost. Can be formed.

FIG. 6 shows another example. This is because the auxiliary cutting edge 3 is made to protrude from the main cutting edge 2 in the tool side surface direction, the radial direction, or both, by the optimum amount of both finishing processing for each work material, cutting more suitable finishing processing. It can be done simultaneously with processing. In this case, if a plurality of sub cutting edges 3 are provided as shown in FIG. 7, all the sub cutting edges 3 have the same shape. The sub-cutting edge 3 located rearward in the rotational direction of the tool 1 may be made to protrude from the sub-cutting edge 3 located frontward by about 5 to 10 μm (in the one shown in FIG. 7, it is projected in the lateral direction), At this time, rough / medium / finishing can be performed simultaneously.

As shown in FIG. 8, the base metal 10 and the auxiliary cutting edge 3 are provided.
It is shown that it is fitted and fixed with bolts 30. When the sub cutting edge 3 projects from the main cutting edge 3,
Although the auxiliary cutting edge 2 is also worn out heavily, the auxiliary cutting edge 3 can be removed and replaced with a new one by loosening the bolt 30. The method of fixing the auxiliary cutting edge 3 to be detachable is not limited to the bolt 30, and a wedge or the like may be used.

FIG. 9 shows that the flank of the main cutting edge 2 is provided with a groove 6 having a cutting edge ridgeline as an end portion so as to cut chips and reduce cutting resistance. The portion left uncut in the groove 6 can be cut by the auxiliary cutting edge 3.
Such a groove 6 may be provided on the flank of the auxiliary cutting edge 3 as shown in FIG.

FIG. 11 shows that the chip removing groove 7 is provided on the front surface of the rake face of the auxiliary cutting edge 3 to facilitate the discharge of the chips by the auxiliary cutting edge 3.

In FIG. 12, a groove whose bottom surface is inclined in the rotation direction is provided on the side surface of the base metal 10, the auxiliary cutting edge 3 is arranged in this groove, and the spacers 3 are provided before and after the auxiliary cutting edge 3.
It is shown that 0 is arranged. If the thickness of the spacer 30 is changed, the position of the sub cutting edge 3 in the circumferential direction changes, and at the same time, the amount of protrusion of the sub cutting edge 3 in the lateral direction changes because the bottom surface of the groove is inclined. Therefore, when it is desired to change the amount of protrusion, this can be easily dealt with, and when the amount of protrusion becomes small due to wear, this can be returned to the original amount for finishing work. In addition, sub cutting edge 3
By making the shape such that it can be attached by changing the left and right or up and down directions, it can be used multiple times.

As shown in FIG. 13, the auxiliary cutting edge 3 is attached to the base metal 2
Alternatively, the spring 8 may be disposed on the rear side and slidable in the circumferential direction of the tool 1, and the spring 8 may be elastically contacted with the rear end of the auxiliary cutting edge 3. If the load resistance at the time of finishing by the auxiliary cutting edge 3 exceeds a predetermined value, the auxiliary cutting edge 3 moves backward against the spring 8, so that the amount of finishing processing can be easily adjusted according to the cutting conditions. is there.

FIG. 14 shows a main cutting edge 2 having a chamfered corner. The tool life can be improved.

[0028]

As described above, in the present invention, in the saw blade in which a plurality of chips are arranged on the outer peripheral portion of the disk-shaped tool, each chip is provided with the main cutting edge and the sub cutting edge. By making the auxiliary cutting edge perform finishing processing, finishing processing can be performed at the same time as cutting, improving the processing efficiency and obtaining a good cutting surface, and one cutting edge is worn However, since the other cutting edge can be used for machining, the tool life can be improved.

If each cutting edge is composed of one block having the same shape and is laminated and joined one block at a time, it is easy to align a plurality of cutting edges, and furthermore, an adhesive or the like is fixed for each block. When the blocks are laminated by the means and can be removed for each block, it is possible to prevent the cutting from being impossible even if the wear progresses.

An ultra-hard material such as sintered diamond may be bonded and bonded to the cutting edge portion in the outer peripheral direction of the tool, the side surface direction, or both. The tool life can be extended and the tool cost can be reduced.

Further, the main cutting edge and the sub cutting edge are arranged side by side in the tool circumferential direction or the radial direction or both.
If the auxiliary cutting edge is projected in the tool side surface direction or the radial direction or both of them than the main cutting edge, the finishing process can be more appropriately performed.

In this case, by providing a plurality of sub cutting edges having a protrusion amount larger than that of the main cutting edge, it becomes possible to maintain a good finished surface for a long period of time.

If the auxiliary cutting edge is detachably fitted and fixed to the tool base metal, the auxiliary cutting edge can be easily replaced.

If a groove having a cutting edge ridgeline as an end is provided on the main cutting edge flank, cutting of chips and cutting resistance can be reduced.

The sub-cutting edge may be inserted in a recess provided in the tool base and the amount of protrusion from the recess may be variable. The optimum finishing allowance can be easily adjusted.

[Brief description of drawings]

FIG. 1 shows an example of an embodiment of the present invention, in which (a)
Is a side view and (b) is a perspective view.

2A and 2B are perspective views of another example.

FIG. 3 is a perspective view of still another example.

FIG. 4 is a perspective view of another example.

5A and 5B are perspective views of yet another example.

FIG. 6 is a perspective view of an example of another embodiment.

FIG. 7 is a perspective view of another example of the above.

FIG. 8 shows another example of the above, in which (a) is a perspective view and (b) is a perspective view.
Is a rear view.

FIG. 9 is a perspective view of still another example.

FIG. 10 is a perspective view of another example.

FIG. 11 is a perspective view of yet another example.

FIG. 12 is a plan view of another example.

FIG. 13 is a perspective view of still another example.

FIG. 14 is a perspective view of another example.

[Explanation of symbols]

1 tool 2 Main cutting edge 3 Secondary cutting edge

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 16, 1998 (1998.11.
16)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

[Title of Invention] Saw blade

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary saw blade mainly used for cutting or end face cutting of soft metal materials such as copper and aluminum, and composite materials such as plastic, wood and copper clad laminate. It is a thing.

[0002]

2. Description of the Related Art As a saw blade which can be used in the above-mentioned applications, Japanese Patent Laid-Open No. 8-281606 discloses that the tip of a blade having a lower blade length projects laterally from the tip of a blade having a higher blade length. A staggered blade type saw is shown in Japanese Patent Application Laid-Open No. 8-
In Japanese Patent No. 187702, six types of blades are projected in the radial direction, and the projection positions in the thickness direction are different from each other.

[0003]

By the way, a rotary saw blade (round blade) is used for cutting or end face cutting of soft metal materials such as copper and aluminum, and composite materials such as plastic, wood and copper clad laminate. Although it is considered that a saw blade can be effectively used, there are the following problems in cutting such a material with a circular saw blade.

That is, when it is intended to obtain a product having good end face quality by cutting, usually two processes of cutting and end face finishing are required, resulting in poor working efficiency. Also,
In order to obtain a good cutting surface using only a circular saw blade, there are staggered blades and combination blades as described above, but in the case of large diameter tools, it is necessary to make the precision variation of each tip small. Due to the difficulty, it is difficult to obtain a good cut surface.

The present invention has been made in view of the above points, and an object of the present invention is to provide a saw blade which has good working efficiency and can obtain a good cutting surface.

[0006]

SUMMARY OF THE INVENTION The present invention, however, provides a saw blade in which a plurality of chips are arranged on the outer peripheral portion of a disc-shaped tool.
The feature is that each chip is provided with a main cutting edge and a sub cutting edge. By allowing the auxiliary cutting edge to carry out the finishing process, the finishing process can be performed simultaneously with the cutting, and even if one of the cutting edges wears , the other cutting edge can perform the processing.

At this time, the main cutting edge and the sub cutting edge are arranged side by side in at least one of the tool circumferential direction and the radial direction, and the projecting amount of both cutting edges in the tool circumferential direction or the side direction. The same can be preferably used.

It is preferable that each cutting edge is composed of one block having the same shape and is laminated and joined one block at a time. Further, each block is laminated by a fixing means such as an adhesive, and one block is formed. It may be removable every time.

A superhard material such as sintered diamond may be bonded and bonded to the cutting edge portion in the outer peripheral direction of the tool, the side surface direction, or both.

Further, the main cutting edge and the sub cutting edge are arranged side by side in the circumferential direction of the tool or in the radial direction or both of them.
The auxiliary cutting edge may project from the main cutting edge in the tool side surface direction, the radial direction, or both.

In this case, it is preferable to provide a plurality of sub-cutting edges having a protrusion amount larger than that of the main cutting edges, and it is also preferable that the sub-cutting edges are detachably fitted and fixed to the tool base metal.

A groove having the cutting edge ridgeline as an end may be provided on the main cutting edge flank.

The sub-cutting edge may be inserted into a recess provided in the tool base metal, and the amount of protrusion from the recess may be variable.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION When the present invention is described in detail based on an example of an embodiment, a saw blade according to the present invention is a disk made of a steel material such as carbon steel or high speed tool steel as shown in FIG. A saw blade in which a tip 11 which is a high-hardness sintered body such as diamond is fixed to a base metal 10 on the outer periphery of the tool 1 by means of brazing or the like, and each tip 11 has a main cutting edge. 2 and a sub cutting edge 3 are provided.

The main cutting edge 2 and the sub cutting edge 3 have a rake angle of
The clearance angle, the circumferential angle, and the centripetal angle are given (the lead angle is also given depending on the shape of the base metal 10), but these are the same in the main cutting edge 2 and the sub cutting edge 3. I am doing it.

In FIG. 1, the main cutting edge 2 and the sub cutting edge 3 are arranged in the circumferential direction, but they are arranged in the radial direction as shown in FIG. 2 (a). May be
Further, as shown in FIGS. 2A and 2B, a plurality of sub cutting edges 3 may be provided. In any case, the auxiliary cutting edge 3 and the main cutting edge 2 have the same shape in the outer peripheral direction and the side surface direction.

The cutting and cutting are mainly performed by the main cutting edge 3 located in the front side or the outer peripheral side in the rotation direction. At this time, the sub cutting edge 3 is responsible for finishing, so that the cutting and cutting are finished at the same time. Processing can also be performed. Also, the main cutting edge 2
Even if is worn , the auxiliary cutting edge 3 can serve as the main cutting edge 2 up to that point, so that machining can be performed. When the auxiliary cutting edge 3 is provided in plural, the finishing process can be simultaneously performed at this time.

In the embodiment shown in FIGS. 1 and 2, the main cutting edge 2 and the sub cutting edge 3 are formed on a single chip 11. However, as shown in FIG. Each block is formed as a block and these blocks are stacked and joined together to form a base metal 1
It may be brazed to 0. It becomes easy to align a plurality of cutting edges. The main cutting edge 2 and the sub cutting edge may be formed by laminating high-hardness sintered bodies having the same shape and then laminating.

When stacking and joining blocks,
As shown in FIG. 4, the base metal 10 is sequentially laminated on the outer peripheral surface of the base metal 10 and fixed by a fixing means such as an adhesive. If the main cutting edge 2 is worn and becomes unusable, a solvent is It may be used so that the worn cutting edge can be removed. After removing the main cutting edge 2, the sub cutting edge 3 up to that point is used as the main cutting edge 2.
Of course, the worn cutting edge (block thereof) may be removed by using a dedicated jig.

The one shown in Figure 5, in which a heart 4 comprising a cutting edge from the ultra-hard material is formed in the multilayer body formed by bonding laminated surface layer portion of the diamond, in this case, the tip 11 at a low cost Can be formed.

FIG. 6 shows another example. This is because the auxiliary cutting edge 3 is made to protrude from the main cutting edge 2 in the tool side surface direction, the radial direction, or both by the optimal amount of finishing processing for each work material, cutting more appropriate finishing processing. It can be done simultaneously with processing. In this case, if a plurality of sub cutting edges 3 are provided as shown in FIG. 7, all the sub cutting edges 3 have the same shape. The sub-cutting edge 3 located rearward in the rotational direction of the tool 1 may be made to protrude from the sub-cutting edge 3 located frontward by about 5 to 10 μm (in the one shown in FIG. 7, it is projected in the lateral direction), At this time, rough / medium / finishing can be performed simultaneously.

As shown in FIG. 8, the base metal 10 and the auxiliary cutting edge 3 are provided.
It is shown that it is fitted and fixed with bolts 30. When the sub cutting edge 3 projects from the main cutting edge 3,
Although the auxiliary cutting edge 2 is worn out severely, the auxiliary cutting edge 3 can be removed and replaced with a new one by loosening the bolt 30. The method of fixing the auxiliary cutting edge 3 to be detachable is not limited to the bolt 30, and a wedge or the like may be used.

FIG. 9 shows that the flank of the main cutting edge 2 is provided with a groove 6 having a cutting edge ridgeline as an end portion so as to cut chips and reduce cutting resistance. The portion left uncut in the groove 6 can be cut by the auxiliary cutting edge 3.
Such a groove 6 may be provided on the flank of the auxiliary cutting edge 3 as shown in FIG.

FIG. 11 shows that the chip removing groove 7 is provided on the front surface of the rake face of the auxiliary cutting edge 3 to facilitate the discharge of the chips by the auxiliary cutting edge 3.

In FIG. 12, a groove whose bottom surface is inclined in the rotation direction is provided on the side surface of the base metal 10, the auxiliary cutting edge 3 is arranged in this groove, and the spacers 3 are provided before and after the auxiliary cutting edge 3.
It is shown that 0 is arranged. If the thickness of the spacer 30 is changed, the position of the sub cutting edge 3 in the circumferential direction changes, and at the same time, the amount of protrusion of the sub cutting edge 3 in the lateral direction changes because the bottom surface of the groove is inclined. Therefore, when it is desired to change the protrusion amount, this can be easily dealt with, and when the protrusion amount becomes small due to wear , it is returned to the original amount to obtain a necessary finishing machining allowance. be able to. In addition, sub cutting edge 3
By making the shape such that it can be attached by changing the left and right or up and down directions, it can be used multiple times.

As shown in FIG. 13, the auxiliary cutting edge 3 is attached to the base metal 2
Alternatively, the spring 8 may be disposed on the rear side and slidable in the circumferential direction of the tool 1, and the spring 8 may be elastically contacted with the rear end of the auxiliary cutting edge 3. If the load resistance at the time of finishing by the auxiliary cutting edge 3 exceeds a predetermined value, the auxiliary cutting edge 3 moves backward against the spring 8, so that the amount of finishing processing can be easily adjusted according to the cutting conditions. is there.

FIG. 14 shows a main cutting edge 2 having a chamfered corner. The tool life can be improved.

[0028]

As described above, in the present invention, in the saw blade in which a plurality of chips are arranged on the outer peripheral portion of the disk-shaped tool, each chip is provided with the main cutting edge and the sub cutting edge. by causing finishing play a processed secondary cutting, it is possible to obtain a good cut surface it is possible to improve the processing efficiency can be performed simultaneously finishing cut, also one of the cutting edge is worn However, since the other cutting edge can be used for machining, the tool life can be improved.

If each cutting edge is composed of one block having the same shape and is laminated and joined one block at a time, it is easy to align a plurality of cutting edges, and furthermore, an adhesive or the like is fixed for each block. When the blocks are laminated by the means and can be removed for each block, it is possible to avoid the inability to cut even if the wear progresses.

A superhard material such as sintered diamond may be bonded and bonded to the cutting edge portion in the outer peripheral direction of the tool, the side surface direction, or both. The tool life can be extended and the tool cost can be reduced.

Further, the main cutting edge and the sub cutting edge are arranged side by side in the tool circumferential direction or the radial direction or both.
If the auxiliary cutting edge is projected in the tool side surface direction or the radial direction or both of them than the main cutting edge, the finishing process can be more appropriately performed.

In this case, by providing a plurality of sub cutting edges having a protrusion amount larger than that of the main cutting edge, it becomes possible to maintain a good finished surface for a long period of time.

If the auxiliary cutting edge is detachably fitted and fixed to the tool base metal, the auxiliary cutting edge can be easily replaced.

If a groove having a cutting edge ridgeline as an end is provided on the main cutting edge flank, cutting of chips and cutting resistance can be reduced.

The sub-cutting edge may be inserted in a recess provided in the tool base and the amount of protrusion from the recess may be variable. The optimum finishing allowance can be easily adjusted.

[Brief description of drawings]

FIG. 1 shows an example of an embodiment of the present invention, in which (a)
Is a side view and (b) is a perspective view.

2A and 2B are perspective views of another example.

FIG. 3 is a perspective view of still another example.

FIG. 4 is a perspective view of another example.

5A and 5B are perspective views of yet another example.

FIG. 6 is a perspective view of an example of another embodiment.

FIG. 7 is a perspective view of another example of the above.

FIG. 8 shows another example of the above, in which (a) is a perspective view and (b) is a perspective view.
Is a rear view.

FIG. 9 is a perspective view of still another example.

FIG. 10 is a perspective view of another example.

FIG. 11 is a perspective view of yet another example.

FIG. 12 is a plan view of another example.

FIG. 13 is a perspective view of still another example.

FIG. 14 is a perspective view of another example.

[Explanation of symbols] 1 tool 2 Main cutting edge 3 Secondary cutting edge

Claims (10)

[Claims] 1. A saw blade in which a plurality of chips are arranged on the outer peripheral portion of a disk-shaped tool, wherein each chip is provided with a main cutting edge and a sub cutting edge. 2. The main cutting edge and the sub cutting edge are arranged side by side in at least one of the tool circumferential direction and the radial direction, and the projecting amount of both cutting edges in the tool circumferential direction or the lateral direction is The saw blade according to claim 1, wherein the saw blades are the same. 3. The saw blade according to claim 2, wherein each cutting edge is formed of one block having the same shape, and each block is laminated and joined. 4. The saw blade according to claim 3, wherein each block is laminated by a fixing means such as an adhesive and can be removed block by block. 5. The saw blade according to claim 1, wherein a superhard material such as sintered diamond is bonded and bonded to the cutting edge portion in the tool outer peripheral direction, the side surface direction, or both. 6. A main cutting edge and a sub cutting edge are arranged side by side in a tool circumferential direction, a radial direction, or both, and the sub cutting edge is in a tool lateral direction or a radial direction more than the main cutting edge.
The saw blade according to claim 1, wherein the saw blade protrudes from both of them. 7. The saw blade according to claim 6, wherein a plurality of sub-cutting edges having a larger protrusion amount than the main cutting edge are provided. 8. The saw blade according to claim 6, wherein the auxiliary cutting edge is detachably fitted and fixed to the tool base metal. 9. The saw blade according to claim 6, wherein the main cutting edge flank is provided with a groove whose end portion is a cutting edge line. 10. The saw blade according to claim 6, wherein the auxiliary cutting edge is inserted into a concave portion provided on the tool base and the amount of protrusion from the concave portion is variable.