JPH0839347A - Throwaway tip - Google Patents

Abstract

PURPOSE:To precisely fit the run out of a cutting edge and improve the working precision by forming, on the lower surface of a tip body, a recessed groove part capable of being fitted to a protruding part formed on a tip mounting seat side. CONSTITUTION:A throwaway tip 15 is mounted on a tip mounting seat 14 by bringing its rear end surface 19C into contact with a mounting seat wall surface 14B, and fitting the lower surface 19B to the mounting seat bottom surface 14A side in the state where a recessed groove part 22 is fitted to a protruding part 17. A clamp screw 15 inserted to the insert hole 23 of a tip body 19 from the outer circumferential side of a tool is screwed to a clamp screw hole 18 formed on the protruding part 17, whereby the throwaway tip is fixed to a tool body 11. The depth D of the recessed groove part 22 is set slightly smaller than the height H of the protruding part 17. Therefore, in the state where the throwaway tip 15 is installed to the tip mounting seat 14, a slit clearance is formed between the lower surface 19B of the tip body 19 and the mounting seat bottom surface 14A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throw-away tip which is detachably attached to a metal saw used for cutting a metal material such as aluminum to provide its cutting edge.

[0002]

2. Description of the Related Art As a metal saw used for cutting this kind of metal material, for example, those shown in FIGS. 9 and 10 are known. In the metal saw shown in these figures, a plurality of chip pockets 2 which are recessed toward the inner peripheral side of the tool are formed at intervals in the circumferential direction on the outer peripheral portion of the tool body 1 formed of steel or the like and having a thin disk shape. The wall surface 2A and the outer peripheral surface 3 are located at the intersection ridge of the wall surface 2A and the outer peripheral surface 3 of the tool body 1 that face the tool rotation direction (white arrow direction in the drawing) of the chip pockets 2 ... The tool mounting direction 4 is formed so as to be respectively recessed to the rear side in the tool rotation direction and the inner circumference side of the tool, and the cutting edge chip 5 is joined to the tool mounting seat 4 by brazing,
The cutting edge 6 is provided on the outer periphery of the tool body 1.

Here, the cutting edge tip 5 has an ultra-high hardness sintered body 8A of diamond, CBN (cubic boron nitride) or the like on one side of a flat base material 7 made of cemented carbide or steel.
And a high-hardness sintered body 8B of cemented carbide or the like, and a layered sintered body 8 is brazed with the portion of the high-hardness sintered body 8B facing the base metal 7 side. One side to which the layered sintered body 8 is attached is located on the outer peripheral side of the tool, and the portion of the ultra-high hardness sintered body 8A is attached to the tool main body 1 with the tool rotating direction side. Then, the cutting edge 6 is provided on the side edge portion of the outer peripheral side of the tool of the ultra-high hardness sintered body 8A.
Is formed.

The cutting edge 6 is formed in a direction parallel to the axis of rotation of the tool body 1, and the width W of the cutting edge is greater than the thickness T of the outer periphery of the tool body 1 on both sides in the axial direction. It is formed to be slightly larger. Further, the cutting edge is formed by alternately arranging the cutting edge tip formed only on one side in the axial direction and the cutting edge tip formed only on the other side in the circumferential direction of the tool body. A so-called zigzag blade metal saw is also proposed, in which the blade width in the rotation locus around the axis is larger than the thickness of the outer peripheral portion of the tool body.

[0005]

By the way, in the above metal saw, since the cutting edge 6 is formed on the ultra-high hardness sintered body 8A, it is possible to give the cutting edge 6 high strength and wear resistance. However, even with such a metal saw, when an excessive load acts on the cutting edge 6 during cutting, chipping or chipping of the cutting edge 6 is unavoidable. Further, no matter how high the abrasion resistance is, it is inevitable that the cutting edge will be worn during long-term use. However, in the metal saw having the above structure, the layered sintered body 8 having the cutting edge 6 formed thereon is integrally joined to the cutting edge tip 5 by brazing, and the cutting edge tip 5 is further brazed. Since it is integrally bonded to the cutting edge 6, if damage is caused by chipping or loss of the cutting edge 6, this may reach the cutting edge tip 5 or the tool body 1.

Further, even if the tool body 1 is not damaged, it is difficult to replace the brazed cutting edge tip 5 when the cutting edge 6 is chipped or chipped. The blade 6 will be re-polished. This is also the case when the sharpness of the cutting edge 6 deteriorates due to wear. However, in this type of metal saw, the number of cutting edges increases as the outer diameter of the tool increases, and a great amount of labor, time and skill are required to accurately re-grind all of these cutting edges. Becomes Further, in the metal saw having the above structure, the tool strength is unavoidably deteriorated at the brazed portion between the cutting edge tip 5 and the tool body 1, and in addition, the hardness and rigidity may be deteriorated on the tool body 1 side. There is also a possibility that the tool body 1 itself may be directly damaged when an excessive cutting load is applied as described above.

[0007] Here, as one of means for solving such a problem, it has been considered to make the cutting edge tip attachable to and detachable from the tool body so as to realize a throw-away operation. However, in such a metal saw, the blade width W of the cutting blade 6 is
Since the thickness T of the tool body 1 is also limited by this, the clamping means for attaching the throwaway cutting edge tip 5 to the tool body 1 is naturally restricted, and a sufficient clamping force cannot be obtained and the cutting edge is not obtained. There is a possibility that the mounting rigidity of the chip 5 may not be secured. This is not limited to metal saws,
For example, it is a common problem in a cutting tool such as a bite for grooving / cutting-off, in which the thickness on the tool body side has to be smaller than the blade width of the cutting blade depending on the processing form. Further, in a metal saw having a large number of cutting edges on the outer periphery of the tool body, it is extremely difficult to accurately adjust the runout of the cutting edge by simply making the cutting edge insert a throwaway tool. In addition, a new problem is caused in that the cutting edge may vary and the vibration may occur during cutting.

The present invention has been made under such a background, and is most suitable for use in solving a problem of a conventional metal saw by a throwaway method, and a new method associated with the throwaway method is provided. It is intended to provide a throw-away chip capable of solving a problem.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems and achieve the above object, the present invention is a throw-away device which is detachably attachable to a tip mounting seat formed on a tool body by a clamp screw. A chip, in which a cutting edge is formed at a ridge line portion where an upper surface and a tip surface of a substantially rectangular parallelepiped chip body intersect with each other, and a lower surface of the chip body is formed from the tip surface to a rear end surface of the chip body. And a recessed groove portion that can be fitted to the protrusion formed on the chip mounting seat side is formed, and an insertion hole through which the clamp screw is inserted is formed from the upper surface to the lower surface. To do.

[0010]

The throw away tip of the cutting tool is detachably attached to the tool body by mounting the throw away tip having such a configuration on the tip mounting seat formed in the tool body and performing cutting. Since it is provided on the tip, even if the cutting edge is chipped, chipped, or worn, the sharpness and the like can be easily recovered by replacing the throw-away tip. Moreover,
Since the throw-away tip and the tool body are separate bodies,
The damage caused to the cutting edge does not reach the tool body,
Also, the decrease in tool strength due to brazing and the hardness of the tool body,
There is no reduction in rigidity.

A concave groove is formed on the lower surface of the tip body of the throw-away tip so as to extend from the front end surface to the rear end surface of the tip main body. By making it possible to fit the protrusion portion provided on the chip, the throw-away tip can be firmly mounted on the tip mounting seat by fitting the both, and high mounting rigidity can be secured. Moreover, since the groove portion is formed in the plane direction orthogonal to the blade width direction of the cutting blade, that is, in the plane direction orthogonal to the extending direction of the cutting blade,
Due to the fitting of the groove portions, the indexable insert is accurately positioned, and the swing of the cutting edge can be adjusted with high accuracy. Further, the clamp screw for mounting the throw-away tip on the tip mounting seat is inserted into the insertion hole formed from the upper surface to the lower surface of the tip body and screwed to the tool body side. By tightening the screw, the fitting of the concave groove portion becomes stronger, which makes it possible to further improve the mounting rigidity of the throw-away tip.

Here, in order to secure high strength and wear resistance to the cutting edge, a layered sintered body composed of a high hardness sintered body and an ultra high hardness sintered body is bonded to the chip body. It is desirable to form the cutting edge on the portion of the ultra-high hardness sintered body of this layered sintered body. Further, in this case, if the upper surface side of the chip body is used as a rake surface, it is desirable to bond the layered sintered body so that the portion of the super-hard sintered body faces the upper surface side of the chip body. On the other hand, if the tip surface side of the chip body is used as a rake face, it is desirable to join the layered sintered body so that the portion of the ultra-high hardness sintered body faces the tip surface side. That is, by joining the layered sintered bodies in this way, the surface of the ultra-high hardness sintered body containing diamond or CBN as a main component and having extremely high strength and wear resistance is provided from the cutting edge to the rake face side. Since it extends widely, it becomes possible to more surely promote the improvement of strength and wear resistance by using such an ultra-high hardness sintered body.

[0013]

1 to 4 show an embodiment of the present invention, and FIGS. 1 to 3 show the case where the embodiment is mounted on a metal saw. In these figures,
The tool body 11 of the metal saw is made of steel or the like and has a substantially disc shape, and at least the outer peripheral portion thereof is formed thin. The outer peripheral portion of the tool body 11 has an outer peripheral surface 12 A plurality of chip pockets 13 are formed at regular intervals in the circumferential direction of the tool body 11 so as to be recessed inward from the inner peripheral side of the tool body 11. The tool rotation direction of these chip pockets 13 (indicated by a white arrow in the figure). 13A facing the wall
A tip mounting seat 14 is formed at a ridge line intersecting with the outer peripheral surface 12 of the tool body 11. Then, the throw-away tip 15 of this embodiment is detachably attached to each of these tip mounting seats 14 by a clamp screw 16.

The tip mounting seat 14 is composed of a bottom surface 14A of the mounting seat formed so as to be recessed one step from the outer peripheral surface 12 of the tool body 11 toward the inner peripheral side of the tool and facing the outer peripheral side of the tool, and the wall surface 13A of the chip pocket 13 described above. The outer peripheral surface 12 is recessed one step rearward in the tool rotation direction and is orthogonal to the mounting seat bottom surface 14A.
And a mounting seat wall surface 14B facing the tool rotation direction formed so as to be continuous with the chip pocket 13
Is formed as a recess communicating with. However, the mounting seat bottom surface 14A is formed so as to be slightly inclined with respect to the tangential direction of the tool body 11 so as to be directed toward the tool inner peripheral side toward the rear side in the tool rotation direction. Also, the mounting seat bottom surface 14
A relief portion 14C is provided on the ridge line where A and the mounting seat wall surface 14B intersect.
Are formed.

Here, the mounting seat bottom surface 14A of the tip mounting seat 14 is located at the center of the mounting seat bottom surface 14A in the thickness direction of the tool body 11 and on the mounting seat bottom surface 14A orthogonal to the thickness direction. A ridge portion 17 extending linearly in parallel is formed. As shown in FIG. 3, the protrusion 17 is formed so that its cross section has a rectangular shape, and the mounting seat wall surface 1 on the rear side from the tool rotation direction front end of the mounting seat bottom surface 14A.
4B is formed. Also, this ridge 1
A clamp screw hole 18 is formed in the central portion of the upper surface of 7 in a direction orthogonal to the mounting seat bottom surface 14 </ b> A and toward the inner peripheral side of the tool.

On the other hand, in the throw-away tip 15 of this embodiment mounted on the tip mounting seat 14 as described above, the tip body (base material) 19 is formed in a substantially rectangular parallelepiped shape as shown in FIG. The upper surface 19A and the lower surface 19B of the chip body 19 are parallel to each other, and the upper and lower surfaces 19A,
19B and the rear end surface 19C are formed in directions orthogonal to each other. However, the ridge line portion where the lower surface 19B and the rear end surface 19C intersect is obliquely cut out to form a relief portion 19D. Further, both side surfaces 19E, 19E of the chip body 19
Are inclined so that they approach each other as they go from the upper surface 19A side to the lower surface 19B side, and as they go from the front end surface 19F side to the rear end surface 19C side of the chip body 19.

Furthermore, the tip surface 19F is the upper surface 1
It is formed so as to be inclined toward the rear end surface 19C side from the 9A side toward the lower surface 19B side, and at the upper surface 19A side portion of the front end surface 19F, the rear end surface 19C is parallel to the front end surface 19E. A recess 19G is formed so as to be recessed to the side by one step. Then, diamond or CBN (cubic boron nitride) is provided in the recess 19G.
A layered sintered body 20 obtained by laminating a super-hardened sintered body 20A containing, for example, etc. and a high-hardened sintered body 20B made of cemented carbide or the like and integrally sintering the laminated body is a high-hardened sintered body. The portion 20B is closely adhered to the recess 19G and is joined by brazing. The portion of the super-hard hardness sintered body 20A facing the tip end side of the layered sintered body 20 has an upper surface at the side edge portion on the upper surface 19A side. A cutting edge 21 is formed in a direction parallel to 19A and the rear end surface 19C.

Further, a concave groove portion 22 is formed on the lower surface 19B of the chip body 19. The recessed groove portion 22 is formed in the central portion of the lower surface 19B in the direction in which the cutting blade 21 is formed,
It is formed so as to reach from the front end surface 19F to the rear end surface 19C in parallel to the upper and lower surfaces 19A and 19B, and the cross section thereof is formed to have a rectangular shape like the protruding portion 17. The width W ₂₂ of the groove ₂₂ is substantially equal to the width W _{17 of the} ridge 17 so that it can be fitted into the ridge 17 formed on the mounting seat bottom surface 14A of the chip mounting seat 14. It is formed to be slightly larger, and the cutting edge 21
The width W ₂₁ is set to 10% or more. Further, the depth D of the concave groove portion 22 from the lower surface 19B is set to be slightly smaller than the height H of the protruding portion 17 from the mounting seat bottom surface 14A in this embodiment.

The chip body 19 has an upper surface 19
An insertion hole 23 is formed so as to penetrate from substantially the center of A perpendicularly to the upper surface 19A toward the center of the concave groove portion 22 of the lower surface 19B. Here, the upper surface 19A of the insertion hole 23
The side portion is formed in a tapered surface shape whose diameter gradually increases toward the upper surface 19A side. Furthermore, the distance L ₂₃ between the rear end surface 19C and the center of the chip body 19 of the insertion hole 23 is formed in the protruding portion 17 of the mounting seat bottom 14A of the chip mounting seat 14 of the clamp screw hole 18 The distance L ₁₈ between the center and the wall surface 14B of the mounting seat is set to be slightly larger than the distance L ₁₈ . Furthermore, the layered sintered body 20
Surface 20a facing the tip side of the chip and surface 2 facing the upper side of the chip
0b is formed so as to be substantially flush with the front end surface 19F and the upper surface 19A of the chip body 19, or slightly parallel to the front end surface 19F and the upper surface 19A.

The throw-away tip 1 having such a configuration
5, the rear end surface 19C is brought into contact with the mounting seat wall surface 14B, and the lower surface 19B is seated on the mounting seat bottom surface 14A side in a state where the concave groove portion 22 is fitted to the ridge portion 17 and It is attached. Then, the clamp screw 16 inserted into the insertion hole 23 of the chip body 19 from the outer peripheral side of the tool is replaced with the clamp screw hole 18 formed in the protrusion 17.
It is fixed to the tool body 11 by being screwed on. In this embodiment, since the depth D of the concave groove portion 22 is formed to be slightly smaller than the height H of the protruding portion 17, in the state where the throw-away tip 15 is mounted on the tip mounting seat 14. As shown in FIGS. 1 and 3, a slight gap is formed between the bottom surface 19B of the chip body 19 and the mounting seat bottom surface 14A. Further, as the clamp screw 16, a countersunk screw type whose head is formed in an inverted truncated cone shape is used, and the conical surface of this head is a tapered surface above the insertion hole 23 of the chip body 19. Since the distance L ₂₃ is set to be larger than the distance L ₁₈ and the clamp screw 16 is screwed in, the throw-away tip 15 is pressed toward the mounting seat wall surface 14B side. It is designed to be attached to the mounting seat 14.

As described above, in the metal saw to which the throw-away tip 15 of this embodiment is attached, the layered sintered body 2 is used.
0 surface 20b and the upper surface 19A of the chip body 19
However, in accordance with the inclination of the mounting seat bottom surface 14A of the tip mounting seat 14 described above, the tip is inclined toward the inner circumferential side of the tool as it goes rearward in the tool rotation direction, thereby providing the cutting edge 21 with a clearance angle. Further, the tip end side of the layered sintered body 20, that is, the surface 20a facing the tool rotation direction side and the tip end surface 19F of the tip body 19 are the inclination of the mounting seat bottom surface 14A and the lower surface 19 of these surfaces 20a and tip end surface 19F.
Depending on the inclination with respect to B, the blade is inclined toward the rear in the tool rotation direction toward the inner peripheral side of the tool, whereby the cutting edge 21 is given a positive rake angle α. Further, since both side surfaces 19E, 19E of the chip body 19 are inclined so as to approach each other toward the lower surface 19B side and the rear end surface 19C side, these side surfaces 19E, 19E are formed.
E is also provided with a clearance toward the inner circumferential side of the tool and rearward in the tool rotation direction with respect to the cutting edge 21.

However, according to the metal saw using the throw-away tip 15 of this embodiment, the clamp screw 1 is attached to the tip mounting seat 14 formed on the tool body 11.
6, the throw-away tip 15 is detachably attached, and cutting such as cutting is performed by the cutting edge 21 formed on the ultra-high hardness sintered body 20A of the layered sintered body 20 joined to the throw-away tip 15. Therefore, even if the cutting edge 21 is damaged, chipped, or worn, and the sharpness is impaired, the sharpness can be easily and quickly changed by exchanging the throw-away tip 15. You can recover. Also, with respect to the replaced throw-away tip 15, by removing the same and re-polishing the surface 20b of the layered sintered body 20 continuous with the cutting edge 21 toward the lower surface 19B side of the chip body 19, The sharpness can be easily recovered.

Further, even if the cutting edge 21 is broken or chipped due to an excessive load applied during cutting, the throw-away tip 15 and the tool body 11 are separate bodies. Because of the damage, the chip body 1
It stops only at 9 and does not reach the tool body 11. Further, the throw-away tip 15 is fixed to the tip mounting seat 14 by the clamp screw 16 so that the tool body 1
Since it is integrated into 1, the tool body will not be directly damaged due to a decrease in hardness or rigidity of the tool body due to brazing as in the conventional case.

Moreover, in the throw-away tip 15 of this embodiment, the groove portion 22 formed on the lower surface 19B of the tip body 19 can be fitted into the ridge portion 17 formed on the bottom surface 14A of the tip mounting seat 14. The clamp screw 16 presses and fixes the mounting seat bottom surface 14 </ b> A side in a state where both are fitted. Therefore, the thickness T of the tool body 11
Therefore, even in a tool such as a metal saw, in which it is difficult to obtain a sufficient tip mounting rigidity when a throw-away method is adopted, the throw-away tip 15 is firmly attached to the tip mounting seat 14 for high mounting. Since the rigidity can be secured and rattling and the like can be suppressed, the throw-away tip 15 is stably fixed to the tool main body 11, and thus smooth cutting can be performed. Further, since the throw-away tip 15 is clamped to the tip mounting seat 14 by the clamp screw 16 inserted from the outer peripheral side of the tool body 11, the clamp screw as the clamping means is used to clamp the throw-away tip 15. Clamp screw hole 18 for screwing 16
It suffices that the tool body 11 has a thickness T capable of forming the shape. Therefore, even in the metal saw in which the thickness T of the tool body 11 is limited as described above, the throw-away tip 15 can be clamped more reliably. It is possible to further improve the mounting rigidity.

Further, in the throw-away tip 15 having the above-described structure, the concave groove portion 22 which can be fitted into the projecting ridge portion 17 of the tip mounting seat 14 is arranged in the plane direction orthogonal to the blade width W ₂₁ direction of the cutting blade _21. It is formed, that is, formed in a plane direction orthogonal to the extending direction of the cutting edge 21, and such a throw-away tip 15 fits the concave groove portion 22 to the ridge portion 17 and is mounted on the tip mounting seat 14. By being mounted, the throw-away tip 15 is surely restrained from misalignment or rattling in the axial direction of the tool body, and the tool body 1
1 will be positioned accurately. For this reason, according to the metal saw having the above-described structure in which the throw-away tip 15 is mounted, it becomes possible to adjust the deflection of each of the cutting blades 21 provided on the tool body 11 with high accuracy, thereby cutting with the metal saw. It is possible to improve the processing accuracy such as to obtain a high-quality processed surface (cut surface), suppress vibration due to variations in runout accuracy, and perform smoother processing.

Further, in this embodiment, the ultra-high hardness sintered body 20 of the layered sintered body 20 in which the cutting edge 21 is joined to the chip body 19 is used.
Since the cutting edge 21 itself is provided with high strength and wear resistance in the portion A, it is possible to prevent the cutting edge 21 from being damaged, chipped, or worn. This has the advantage that the tool life can be extended. Although the cutting edge 21 is formed in a straight line in the present embodiment, a nick is formed in the cutting edge 21 to improve chip disposability, or a cutting blade is provided with a chamfer. The strength may be further improved. Further, in the present embodiment, the cutting edge 2
The blade width W _{21 of} No. 1 is formed so as to match the blade width of the metal saw, and one side surface 1 of the tip body 19 is formed so that the blade width W ₂₁ becomes a staggered metal saw as described above.
It is also possible to use two kinds of throw-away tips 15 having cutting edges 21 and 21 that are provided so as to be biased to the 9E side and the other side surface 19E side, and to alternately attach these in the circumferential direction of the tool body 11. .

Further, in this embodiment, the clamp screw 16 is inserted from the upper surface 19A of the chip body 19 toward the lower surface 19B of the chip body 19 in which the concave groove portion 22 which can be fitted into the protrusion 17 is formed. The insertion hole 23 is formed,
By screwing the clamp screw 16 into the clamp screw hole 18 formed on the bottom surface 14A of the mounting seat 14 of the chip mounting seat 14, the throw-away chip 15 is mounted on the chip mounting seat 14.
It is attached to. Therefore, when the clamp screw 16 is tightened, the concave groove portion 22 is tightly fitted to the protruding portion 17, whereby the attachment rigidity of the throw-away tip 15 is further improved, and the deflection of each cutting edge 21 ... According to the present embodiment, the throw-away tip 15 can be more firmly attached to a tool having a small thickness T of the tool body 11, such as a metal saw, because they can be matched with each other with higher accuracy.
It is possible to clamp more reliably and hold it, and it is possible to obtain higher quality and perform higher-quality and smooth cutting.

In this embodiment, the depth D of the concave groove portion 22 is set to be slightly smaller than the height H of the protruding portion 17 as described above, whereby the throw-away tip 15 is provided.
In the mounted state, a slight gap is formed between the lower surface 19B of the chip body 19 and the mounting seat bottom surface 14A of the chip mounting seat 14. Therefore, the protruding portion 17 of the chip mounting seat 14 and the recessed groove portion 22 of the chip 15 are fitted in a state where the upper surface and the side surface of the protruding portion 17 and the bottom surface and the side wall surface of the recessed groove portion 22 are in close contact with each other. Become. Therefore, according to the present embodiment, the thickness T of the outer peripheral portion of the tool body 11 is particularly small, and when the protrusion 17 is formed on the mounting seat bottom surface 14A, the area of the mounting seat bottom surface 14A itself becomes extremely small. In some cases, mainly the ridge 1
The seating area of the chip 15 can be secured by fitting the 7 and the concave groove portion 22, and the chip can be stably mounted.

However, in this embodiment, the concave groove portion 2 is formed as described above.
The depth D of 2 is set to be slightly smaller than the height H of the protruding portion 17, so that the upper surface and the side surface of the protruding portion 17 and the bottom surface and the side wall surface of the recessed groove portion 22 adhere to the protruding portion 17. The concave groove portion 22 is adapted to be fittable. However, for example, when it is possible to secure a certain large thickness T in the tool body 11, the depth D of the concave groove portion 22 is set as shown in FIG. Ridge 17
Set slightly higher than the height H of the chip body 19
The recessed groove portion 22 can be fitted into the projecting ridge portion 17 in a state where the lower surface 19B and the side wall surface of the recessed groove portion 22 are in close contact with the mounting seat bottom surface 14A of the chip mounting seat 14 and the side surface of the projecting ridge portion 17. Good. In this case, a slight gap is formed between the upper surface of the protruding portion 17 and the bottom surface of the groove portion 22. However, by adopting such a configuration, the seating area of the throw-away tip 15 is secured mainly by the mounting seat bottom surface 14A and the lower surface 19B of the tip body 19, and the recessed groove portion 22 is not fitted into the ridge portion 17. Since the throw-away tip 15 is mainly used for positioning, the seating stability of the throw-away tip 15 can be maintained and the load acting on the protruding portion 17 and the concave groove portion 22 during cutting can be reduced. Therefore, it is possible to prevent the load 17 from damaging the ridge 17 and the groove 22.

Further, the depth D of the concave groove portion 22 and the height H of the protruding portion 17 are made equal to each other, and the bottom surface and the side wall surface of the concave groove portion 22 and the lower surface 19B of the chip body 19 form the protruding portion 17. The recessed groove portion 22 can be fitted into the protruding portion 17 in a state where they are in close contact with the upper and side surfaces and the mounting seat bottom surface 14A, respectively, and the throw-away tip 15 can be mounted to the tip mounting seat 14 as a matter of course. Absent. Further, the present invention is not limited to the shape of the tip mounting seat on the tool body side of a cutting tool such as a metal saw. For example, the thickness T of the tool body 11 is extremely small, and the mounting seat bottom surface 14A has the above-described shape. Even if it is difficult to form such a ridge portion 17 itself, the mounting seat bottom surface 14A of the chip mounting seat 14 is formed in a planar shape, and the bottom surface of the recessed groove portion 22 is brought into close contact with the mounting seat bottom surface 14A. The concave groove portions 22 are formed on both side surfaces of the outer periphery of the tool body 11 which is continuous with the inner peripheral side of the tool 14A.
In the state where the side wall surface of the above is closely attached, the recessed groove portion 22 can be fitted with the entire portion on the side of the mounting seat bottom surface 14A as a ridge portion,
The throw-away tip 15 may be attached to the tip mounting seat 14.

Furthermore, in the above embodiment, the throwout
The width W of the concave groove portion 22 of the end chip 15 _{twenty two}The tip mounting seat
The cutting blade is of a size that can be fitted into the ridge portion 17 of 14
21 width W_{twenty one}To 10% or more
However, this is the width W of the groove 22._{twenty two}This range
If the width is smaller than the lower limit, the width W of the protrusion 17₁₇Also gets smaller
Throw away tip 15 due to the mating of both
The mounting rigidity of the
May be insufficient for the cutting load acting on
Is caused. Therefore, avoiding such problems
In order to obtain the width W of the groove 22_{twenty two}Is the width W of the cutting edge 21
_{twenty one}On the other hand, as described above, the range should be 10% or more.
It is desirable to set to.

On the other hand, in the above embodiment, the portion of the super-hardened sintered body 20A of the layered sintered body 20 joined to the chip body 19 is directed to the tip surface 19F side of the chip body 19, and the tip surface 19F side and The surface 20a of the layered sintered body 20 facing the tip side of the chip is a rake surface. As shown in FIG. 6 to FIG.
The surface 20b of the A and the layered sintered body 20 that faces the upper side of the chip may be a rake surface. 6 to 8, the same parts as those of the embodiment shown in FIGS. 1 to 4 are designated by the same reference numerals and the description thereof is omitted. Here, in the throw-away tip 15 of this embodiment, a concave portion 19G is formed at the intersection ridge line portion between the upper surface 19A and the tip surface 19F of the tip body 19 so as to be recessed from the upper surface 19A to the lower surface 19B side by one step. The layered sintered body 20 including the ultra-high hardness sintered body 20A and the high-hardness sintered body 20B is joined to the recess 19G by brazing with the portion of the ultra-high hardness sintered body 20A facing the upper surface 19A side. The surface 20a of the layered sintered body 20 facing the tip surface 19F side and the surface 20b of the layered sintered body 20 facing the upper surface 19A side.
A cutting edge 21 is formed on the ridge line intersecting with.

In addition, such a throw-away tip 1
In the tip mounting seat 14 of the tool body 11 to which 5 is mounted, the ridge portion 1 is formed on the mounting seat wall surface 14B facing the tool rotation direction.
7 is formed, and the groove 17 is formed on the ridge 17.
Can be fitted. In addition, this mounting seat wall surface 14B
Is formed so as to slightly incline toward the rear side in the tool rotation direction toward the inner peripheral side of the tool, and the protrusion 17 having a rectangular cross section is formed on the mounting seat wall surface 14B. It is formed so as to extend in the direction orthogonal to the thickness direction of the tool body 11 along the wall surface 14B. Further, the clamp screw hole 18 into which the clamp screw 16 is screwed is provided with the ridge portion 17 in a direction orthogonal to the mounting seat wall surface 14B.
Is formed so as to open on the upper surface of the. In the throw-away tip 15, the upper surface 19A faces the tool rotation direction side and the tip surface 19F faces the tool outer peripheral side, and the concave groove portion 22 formed on the lower surface 19B is formed in the protrusion 17 of the mounting seat wall surface 14B. In addition to fitting, the rear end surface 19C of the chip body 19 is attached to the chip mounting seat 14 with the rear end surface 19C abutting against the mounting seat bottom surface 14A, and further inserted into the insertion hole 23 of the chip body 19 from the front side in the tool rotation direction. The clamp screw 16 is fixed to the tool body 11 by being screwed into the clamp screw hole 18.

The throw-away tip 1 of this embodiment
Also in the chip mounting seat 14 on which the mounting seat 5 is mounted, the mounting seat bottom surface 14A and the mounting seat wall surface 14B are formed in a direction orthogonal to each other, and the mounting seat wall surface 14B is inclined as described above. The bottom surface 14A is also formed to be slightly inclined toward the outer peripheral side of the tool as it goes rearward in the tool rotation direction. However, the inclination angle is set to be smaller than the inclination angle formed by the front end surface 19F of the tip body 19 with respect to the rear end surface 19C. Therefore, when the tip body 19 is mounted on the tip mounting seat 14, it faces the outer peripheral side of the tool. The tip surface 19F of the tip body 19 of the throw-away tip 15 and the surface 20a of the layered sintered body 20 which are the flanks of the cutting edge 21 are flanked toward the inner circumferential side of the tool as it goes toward the rear side in the tool rotation direction. The corners will be given.
Further, since the mounting seat wall surface 14B on which the lower surface 19B of the chip body 19 is seated is formed to be inclined as described above,
The upper surface 19A of the chip body 19 and the surface 20b of the layered sintered body 20 which are parallel to the lower surface 19B are also arranged so as to be inclined toward the rear in the tool rotation direction toward the inner peripheral side of the tool, whereby the cutting edge 21 is formed. Will be given a positive rake angle α.

However, even in the metal saw equipped with the throw-away tip 15 having such a construction, the cutting blade 2
1 is formed on the throw-away tip 15 which is detachably attached to the tool body 11, and the throw-away tip 15 is formed on the lower surface 19 of the tip body 19.
The recessed groove portion 22 formed in B can be fitted into the protruding portion 17 formed in the mounting seat wall surface 18B, and is mounted on the chip mounting seat 14 in a state where both are fitted.
Clamp screw 16 screwed in from the direction opposite to 4B
Since it is fixed by the above, it is possible to obtain the same effect as the above-mentioned embodiment. Further, since the cutting edge 21 is formed on the ultra-high hardness sintered body 20A portion of the layered sintered body 20 joined to the chip body 19, the cutting edge 21 is also provided with high strength and wear resistance. Is possible. Moreover, in addition to these, in the throw-away tip 15 of the present embodiment, the upper surface 19A of the tip body 19 and the surface 20b of the layered sintered body 20 that faces the tip of the chip are rake surfaces, and therefore fit into the ridges 17. The lower surface 19B of the chip body 19 in which the recessed groove portion 22 that can be joined is formed is arranged in a direction opposite to the direction in which the largest principal component of the cutting force acts on the cutting edge 21. Therefore, there is an effect that the throw-away tip 15 that can sufficiently withstand such a main component force and that can be attached to the tip attachment seat 14 more firmly can be provided.

In this embodiment, as in the above embodiment,
The insertion hole 23 through which the clamp screw 16 is inserted is formed in a direction orthogonal to the upper and lower surfaces 19A and 19B of the chip body 19, and accordingly, the clamp screw formed on the upper surface of the protruding portion 17 of the mounting seat wall surface 14B. The hole 18 is also the wall surface 14B of the mounting seat.
Although it is formed in a direction orthogonal to, when the outer diameter of the tool body 11 of a tool such as a metal saw to which the throw-away tip 15 is attached is small and the size of the tip pocket 13 is also limited, It may be difficult to screw the clamp screw 16 straight from the tool rotation direction side. Therefore, in such a case, the clamp screw hole 18 is formed so as to be inclined toward the inner circumferential side of the tool as it goes rearward in the tool rotation direction, and the insertion hole 23 of the throw-away tip 15 is also formed.
5 is attached to the upper and lower surfaces 19A and 19B so as to be aligned with the clamp screw hole 18 in a straight line, and the insertion hole 23 and the clamp screw hole 18 which are inclined in this manner are provided on the tool rotation direction side and The clamp screw 16 may be obliquely inserted from the outer peripheral side of the tool and screwed to the tool body 11.

Further, in each of the above-described embodiments, the case where the throw-away tip 15 of the embodiment is attached to the metal saw has been described, but the present invention is not limited to attachment to such a tool. It is also possible to mount it on other cutting tools having the same problem as the metal saw, such as the cutting tool used for the grooving / cutting-off process described above.

[0038]

As described above, according to the present invention, it becomes possible to easily recover the deterioration of the sharpness of the cutting edge due to chipping, chipping, wear or the like by replacing the throw-away tip, and By re-polishing with the away tip removed, the re-polishing step can be performed very easily. Further, since the breakage of the throw-away tip does not reach the tool body or the hardness or rigidity of the tool body is deteriorated by brazing, the tool life can be significantly extended. Since the throw-away tip of the present invention is mounted on the tip mounting seat with strong and high mounting rigidity by the concave groove portion that can be fitted to the protruding portion of the tip mounting seat of the tool body, particularly Even when it is attached to a cutting tool such as a metal saw, whose wall thickness must be reduced, it is possible to hold it stably and perform smooth machining. Therefore, it is possible to improve the processing accuracy and obtain a smooth processed surface of high quality.

[Brief description of drawings]

FIG. 1 is a throw-away tip 15 according to an embodiment of the present invention.
It is a partial side view which shows the metal saw which attached | weared.

FIG. 2 is a diagram viewed from the X direction in FIG.

FIG. 3 is a diagram viewed from the YY direction in FIG.

FIG. 4 is a throw-away tip 15 of the embodiment shown in FIG.
(A) side sectional view, (b) front view, (c) plan view,
(D) It is a front view from the direction orthogonal to the front end surface 19F.

FIG. 5 is a view showing a modified example of the embodiment shown in FIG. 1 and corresponding to viewing in the YY direction.

FIG. 6 is a throw-away tip 1 according to another embodiment of the present invention.
It is a partial side view which shows the metal saw with which 5 was mounted.

7 is a diagram viewed from the X direction in FIG. 6.

FIG. 8 is a throw-away tip 15 of the embodiment shown in FIG.
FIG.

FIG. 9 is a partial side view showing a conventional metal saw to which a cutting edge tip is brazed.

10 is a diagram viewed from the YY direction in FIG.

[Explanation of symbols]

 11 Tool Main Body 14 Chip Mounting Seat 14A Mounting Seat Bottom 14B Mounting Seat Wall Surface 15 Chip 16 Clamp Screw 17 Projection 19 Chip Body 20 Layered Sintered Body 20A Ultra High Sintered Body 20B High Hardness Sintered Body 21 Cutting Edge 22 Recessed Groove

Claims (4)

[Claims] 1. A throw-away tip that can be removably attached to a tip mounting seat formed on a tool body by a clamp screw, at a ridge line intersecting an upper surface and a tip surface of a substantially rectangular parallelepiped tip body. A cutting edge is formed, and on the lower surface of the chip body, a concave groove portion that can be fitted to a ridge formed on the chip mounting seat side from the tip surface toward the rear end surface of the chip body is formed. The throw-away tip, which is formed, and further has an insertion hole through which the clamp screw is inserted from the upper surface to the lower surface. 2. A layered sintered body composed of a high-hardness sintered body and an ultra-high-hardness sintered body is joined to an intersection ridge line portion between an upper surface and a tip end surface of the chip body, and the cutting edge is The throw-away tip according to claim 1, wherein the throw-away tip is formed in a portion of the ultra-high hardness sintered body of the layered sintered body. 3. The throw-away tip according to claim 2, wherein the layered sintered body is joined so that a portion of the ultra-high hardness sintered body faces the upper surface side of the chip body. 4. The throw-away tip according to claim 2, wherein the layered sintered body is joined so that the portion of the ultra-high hardness sintered body is directed toward the tip surface side of the tip body. .