JPH10193203A - Throwaway tip and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent loading and a grinding crack of a grinding wheel in the case of particularly regrinding a cutting edge, also facilitate molding of a cutting edge member, prevent a defect of the cutting edge, and apply a metal mold of a general tip. SOLUTION: In a corner part 12 of a base metal 11, a cutting edge member 14 formed by stratifying a hard sintered unit 16 of hard alloy or the like and a cemented hard sintered unit 17 of diamond, CBN, etc., is secured in a manner wherein a flank part 18 of this cutting edge member 14 is protruded to the outside from a flank part 20 of the base metal 11. The flank part 18 of this cutting edge member 14 is provided with a negative flank 21 extended in parallel to the flank 20 of the base metal 11 to be continued to a cutting edge 19 and a positive flank 22 arranged in an opposite side to the cutting edge 19 by interposing this negative flank 21 to be tilted so as to protrude gradually to outside relating to the flank part 20 of the base metal 11 in accordance with going toward a side of the cutting edge 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminar cutting blade member comprising a hard sintered body such as a cemented carbide and a super-hardened sintered body such as diamond or CBN fixed to a corner portion of a base metal. The present invention relates to a throw-away chip (hereinafter, abbreviated as a chip) and a method of manufacturing the same.

[0002]

2. Description of the Related Art Chips of this kind are generally used as shown in FIGS.
In the chips shown in these figures, a concave portion 3 is formed in a corner portion 2 of a square plate-shaped base metal 1 made of a cemented carbide, and a hard sintered body 4 such as a cemented carbide and a diamond or C
A cutting blade member 6 made of a layered sintered body obtained by integrally sintering a super-hardened sintered body 5 such as BN into a layer is brazed by directing the portion of the super-hardened sintered body 5 toward the upper surface of the chip. After fixing the cutting blade member 6 in this way, by grinding the flank surface portion 7 of the cutting blade member 6 and the flank surface portion 8 of the base metal 1 so as to be flush with each other, The cutting edge 9 is formed at the ridge of the ultra-hard sintered body 5.

However, in such a chip, the flank portion 7 of the cutting edge member 6 is required when the cutting edge 9 is formed or when the cutting edge 9 is worn again when the cutting edge 9 is worn. At the same time, the flank portion 8 of the base metal 1 is also ground, so that there is a problem that a grindstone used for grinding is likely to be clogged, and a chip is liable to cause a grinding crack. In order to solve such a problem, for example, Japanese Patent Application Laid-Open No. 62-24902 and Japanese Patent Application Laid-Open No.
For example, Japanese Patent Application Laid-Open Publication No. H11-163555 proposes a chip in which the cutting edge 9 is formed at a position protruding outside the flank portion 8 of the base metal 1.

[0004]

The tip shown in FIGS. 13 and 14 is based on the above-mentioned Japanese Patent Application Laid-Open No. 62-24902, and has a cutting blade member 6 fixed to the corner portion 2 of the base 1. Is formed with a step so that the part of the ultra-hard sintered body 5 on which the cutting edge 9 is formed projects outside the part of the hard sintered body 4 made of a cemented carbide. The flank 8 of the base metal 1 is formed so as to be flush with the flank 7 of the hard sintered body 4. However, in the chip having such a configuration, only the ultra-high-hardness sintered body 5 is disposed immediately below the cutting edge 9, and there is no support by the hard sintered body 4 or the base metal 1. When an excessive load or an impact load acts on the cutting edge 9, the cutting edge 9 formed in the ultra-high hardness sintered body 5 having high hardness and strong brittleness may be broken.

In this chip, the flank portion 7 of the cutting blade member 6 must be provided with the above-mentioned step. For example, as described in this publication, hard sinters formed separately are provided. In a case where the cutting member having such a step is formed by hot pressing the sintered body 4 and the ultra-high hardness sintered body 5 and integrally joining them, the sintered body is integrally sintered as a layered sintered body. The bonding strength is weaker than that of the cutting blade member, and there is a possibility that the ultra-hard sintered body 5 may peel off. On the other hand, a great deal of labor is required to form the above-described steps on a cutting blade member cut into a required size from a layered sintered body (a so-called round blank) integrally sintered and formed into a large-diameter disk shape. And time consuming results.

On the other hand, the tip shown in FIGS. 15 and 16 is based on Japanese Patent Application Laid-Open No. 8-192305, and the cutting blade member 6 fixed to the corner portion 2 of the base metal 1 has a flank portion 7. From the ultra-high hardness sintered body 5 to the hard sintered body 4
And is formed so as to protrude outside the flank portion 8 of the base metal 1, and the protruding amount δ is 0.05 mm to 0.5 mm. . However, this tip eliminates the problem of making a step on the cutting blade member 6 such as the above-mentioned tip, but in particular, when re-polishing the cutting blade 9, the flank portion 7 of the cutting blade member 6 Since the portion of the hard sintered body 4 is also ground, the risk of clogging of the grinding wheel and grinding cracks cannot be eliminated. Further, in the chip described in this publication, the above-mentioned protrusion amount δ is 0.05 mm so as to pursue economy in chip manufacturing.
As described above, the load acting on the cutting edge 9 cannot be expected to be absorbed by the base metal 1, so that there is no possibility that the cutting edge 9 may be damaged when an excessive load or an impact load acts.

Further, when designing such a chip, if it is attempted to provide the same size of cutting edge 9 based on the dimension of the cutting edge 9, as shown in FIGS. In the case of a chip protruding outside the flank 8 of the base metal 1, the size of the base metal 1 must be made one size smaller than the general chip shown in FIGS. 11 and 12 by the amount of protrusion δ. Must. Here, when manufacturing such a base metal 1 made of cemented carbide, it is well known that the cemented carbide material W
C and Co powders are filled in a mold and pressed, and the green compact thus obtained is charged into a furnace and sintered. When the protrusion amount δ is small, By adjusting the composition and composition to increase the shrinkage ratio of the green compact during sintering, the die for the die 1 of the general chip shown in FIGS. The small base 1 can be formed by sintering. However, when the protrusion amount δ is 0.05
If it is larger than mm, it is no longer possible to form the prescribed base metal 1 only by adjusting the composition and composition of such a cemented carbide material, and even if it can be formed, it will cause significant deterioration in quality. Become. As a result, it is necessary to change the mold itself to a slightly smaller one, which is extremely uneconomical.

[0008] The present invention has been made in view of such circumstances, and in the case of a chip having a cutting edge formed in the ultra-high-hardness sintered body portion of the layered sintered body as described above, a cutting edge is formed. Of course, it is possible to prevent clogging and grinding cracks of the grinding wheel, especially when re-polishing the cutting blade, and it is easy to form the cutting blade member, and it is also possible to prevent the loss of the cutting blade. It is an object of the present invention to provide a chip capable of diverting a simple chip mold and a method of manufacturing the same.

[0009]

Means for Solving the Problems To solve the above problems and achieve the above object, a chip of the present invention comprises a hard sintered body such as a cemented carbide at least one of the corners of a base metal. And a cutting member formed by laminating a super-hard sintered body such as diamond or CBN in a layered manner, and a ridge portion of a rake face provided in the super-hard sintered portion of the cutting blade member. In a chip having a cutting edge formed in the flank portion of the cutting blade member, a negative flank surface extending parallel to the flank surface portion of the base metal and connected to the cutting blade, A positive flank is disposed on the side opposite to the cutting blade, and is formed so as to be inclined so as to gradually project outward with respect to the flank of the base metal toward the cutting blade. It is.

However, according to the chip having such a configuration, the flank portion of the cutting blade member has a flank surface of a negative flank on the side of the ultra-hard sintered body connected to the cutting blade, and a flank surface portion of the base metal connected thereto. The negative flank on the side of the ultra-high hardness sintered body where the cutting edge is formed is formed from the positive flank on the side of the hard sintered body inclined with respect to Since it is supported by the positive flank on the side of the hard sintered body that is rich in toughness, even if an excessive load or impact load acts on the cutting edge, it can be absorbed to some extent by the hard sintered body. In addition, loss of the cutting edge can be prevented. And, on the other hand, the flank face of the cutting blade member, the flank face side of the base metal by the positive flank face,
Since it is inclined so as to gradually protrude outward toward the cutting blade side, especially when re-polishing the cutting blade, only the negative flank is ground in a direction parallel to the flank of the base metal, for example. The cutting edge may be re-formed so that the flank portion of the base metal is not ground and the amount of grinding of the hard sintered body portion of the cutting blade member can be reduced.

Here, it is desirable that the inclination angle formed by the flank face of the cutting blade member with respect to the flank face of the base metal is set to 1.5 ° or less. This is because the tilt angle is 1.5
When the angle exceeds °°, the width of the negative flank is relatively large with respect to the positive flank, and the amount of grinding of the hard sintered body during repolishing may not be sufficiently reduced. . Further, the flank of the cutting blade member may be formed so as to entirely project outward with respect to the flank of the base metal, but even in such a case, the flank of the cutting blade member may be formed. At the position closest to the flank surface of the base metal, that is, the amount of protrusion of the base metal from the flank surface at the intersection ridge line between the bottom surface opposite to the rake surface of the cutting blade member and the positive flank surface. Is desirably less than 0.05 mm. This is because, because the flank of the cutting blade member is inclined as described above, if the amount of protrusion is 0.05 mm or more, the amount of protrusion of the cutting blade with respect to the flank of the base metal must be 0.1 mm. It exceeds 0.5 mm, and the above FIG. 15 and FIG.
This is because, similarly to the tip shown in FIG. 6, when an excessive load or an impact load acts, the cutting edge may not be sufficiently prevented from being damaged.

On the other hand, the method of manufacturing a chip according to the present invention forms a cutting blade member formed by forming a hard sintered body such as a cemented carbide and a super-hardened sintered body such as diamond and CBN into layers. The flank portion of the cutting blade member is inclined and formed so as to gradually protrude outward as it goes toward the rake face provided in the ultra-high hardness sintered body portion, and a positive flank is formed on the flank portion of the cutting blade member. While forming a surface, this cutting blade member is fixed to at least one of the corners of the base metal so that the flank surface portion of the cutting blade member projects outside the flank surface portion of the base metal, Thereafter, the rake face side portion of the flank face of the cutting blade member is formed in parallel with the flank face of the base metal to form a negative flank face, and the negative flank face and the rake face face each other. It is characterized in that a cutting edge is formed at the intersection ridge. Therefore, it is not necessary to provide a step in the flank of the cutting blade member, and since the flank of the cutting blade projects outside the flank of the base metal, the flank is ground. At this time, the flank portion of the base metal is not ground, and thus the cutting edge can be easily formed at a position protruding from the flank portion of the base metal to manufacture the chip.

When forming the positive flank, one of the positive flank is a layered sintered body obtained by sintering the hard sintered body and the superhard sintered body in layers. Therefore, it may be formed when forming the cutting blade member. That is, as described above, such a layer-shaped cutting blade member is formed by cutting to a required size from a layered sintered body called a round blank integrally formed by sintering into a large-diameter disk shape. However, if the surface serving as the flank of the cutting blade member is formed obliquely so that the above-mentioned positive flank is formed at the time of this cutting, the subsequent molding of the positive flank is omitted or greatly simplified. Can be On the other hand, this positive flank
The cutting blade member may be formed after being fixed to the corner portion of the base metal. In this case, the cutting of the cutting blade member from the layered sintered body is easy, and the positive flank is formed. This has the advantage that it can be formed with high accuracy.

Preferably, the flank of the cutting blade member is ground so that the positive flank forms an inclination angle of 1.5 ° or less with respect to the flank of the base metal. This is because if the angle of inclination is larger than 1.5 °, the grinding wheel is attached to the flank of the base metal when the positive flank is formed after the cutting blade member is fixed to the base metal as described above. This is because there is a possibility that interference will occur and the width of the negative flank will become relatively large, so that the grinding amount of the hard sintered body may not be sufficiently suppressed. Further, the flank surface of the cutting blade member may be formed so as to entirely project outward with respect to the flank portion of the base metal. In this case, the flank surface of the base metal by the grinding wheel is used. Although it is possible to more reliably prevent the interference with the flank portion, even in such a case, the flank surface of the base metal at the position closest to the flank surface portion of the base metal in the flank surface portion of the cutting blade member It is desirable that the amount of protrusion from the portion be less than 0.05 mm. This is because when the flank of the cutting edge member has a protrusion amount of 0.05 mm or more at the position where the flank of the cutting blade is closest to the flank of the base metal, as compared with the flank of the base metal in the manufactured chip as described above. The protruding amount of the cutting blade must be 0.05
This is because there is a possibility that the diameter of the cutting edge will exceed mm and the cutting edge will not be sufficiently prevented from being lost.

By the way, especially when the inclination angle is set to 1.5 ° or less or the protrusion amount is set to less than 0.05 mm, the protrusion amount of the cutting blade with respect to the flank of the base metal is also reduced. Therefore, according to the manufacturing method of the present invention, it is possible to divert the above-described mold for forming the base of the general chip as it is. That is, in the chip having the above configuration, when designing the chip based on the cutting blade, if the dimensions of the cutting blade are the same, the base metal is:
The flank portion of the cutting blade member and the flank portion of the base metal are slightly smaller than the base metal of a general chip in which the flank of the base metal is flush with the base metal. When the base metal is formed of a sintered body such as a cemented carbide, the amount of protrusion of the blade with respect to the flank surface of the base metal is suppressed to be small. By adjusting the composition and composition to reduce the shrinkage ratio during sintering, it is possible to obtain the above-described slightly smaller metal base without deteriorating the quality. Therefore, according to the above manufacturing method,
It is possible to divert a die for forming the base of the general chip as it is.

[0016]

1 and 2 show an embodiment of a chip according to the present invention. As shown in these figures, the chip of the present embodiment is a rhombus-plate-shaped negative chip, in which the upper surface of a base metal 11 made of cemented carbide has a rhombic shape and a rake surface, and the side surface is the upper surface. Are formed so as to be orthogonal to the flank surface.
In one corner portion 12 forming an acute angle on the upper surface of the diamond shape,
A concave portion 13 is formed so as to be recessed one step from the upper surface, and a substantially triangular flat plate-shaped cutting blade member 14 is joined and fixed to the concave portion 13. The base 11 is provided with a mounting hole 15 for mounting the chip to a tool body such as a cutting tool so as to penetrate the center of the upper and lower surfaces of the diamond.

The cutting blade member 14 is made of a layered sintered body formed by integrally sintering a hard sintered body 16 made of a cemented carbide and a super-hardened sintered body 17 mainly composed of diamond or CBN. The ultra-high hardness sintered body 17 is fixed to the base metal 11 by brazing the concave portion 13 with the portion of the ultra-hard sintered body 17 facing upward. Here, the upper surface of the cutting blade member 14 is flush with the upper surface of the base metal 11, and the upper surface, which is a rake surface of the cutting blade member 14, and the side surface of the cutting blade member 14 intersecting therewith, that is, A cutting edge 19 is formed at an intersection ridge line of the cutting edge member 14 with the flank portion 18. The flank portion 18 of the cutting blade member 14
Is formed in a direction perpendicular to the upper surface, which is a rake face, that is, in a direction parallel to the flank face portion 20 of the base metal 11, and serves as a negative flank face 21. On the other hand, the portion of the hard sintered body 16 on the lower surface side is formed so as to be gradually inclined outwardly toward the cutting edge 19 with respect to the flank surface portion 20 of the base metal 11, A positive flank 22 is provided. Therefore, in this embodiment, the included angle of the cutting edge 19 becomes 90 °, and the cutting edge 19 becomes a negative tip as described above.
The intersecting ridge line between the positive flank 1 and the positive flank 22 is located above the boundary between the ultra-hard sintered body 17 and the hard sintered body 16.

Further, in this embodiment, the cutting blade member 1 is used.
The flank portion 18 of the cutting member 4 is formed so as to entirely project outwardly from the flank portion 20 of the base metal 11.
Close to the flank 20 of the cutting edge member 1
The intersection ridge line portion 23 between the lower surface of 4 and the positive flank 22 is
In this embodiment, the amount of protrusion ε of the base metal 11 with respect to the flank 20 is set to be less than 0.05 mm. The inclination angle θ formed by the positive flank 22 with respect to the flank 20 of the base metal 11 is 1.5 ° in the present embodiment.
(1 ° 30 ') or less. In this way, the flank portion 18 of the cutting blade member 14 projects outward as a whole with respect to the flank surface portion 20 of the base metal 11, and the positive flank surface 22 gradually moves outward as the flank surface 22 moves toward the cutting blade 19. As the blade is inclined so as to protrude, the cutting edge 19 is also
Is formed at a position protruding outward with respect to the flank 20 of the flank.
It is set to be equal to or less than 06 mm.

Next, an embodiment of a method for manufacturing a chip according to the present invention for manufacturing a chip having the above configuration will be described. In the present embodiment, first, in order to manufacture the cutting blade member 14, similarly to the cutting blade member made of a general layered sintered body fixed to this type of chip, the hard sintered body 16 is placed in a cylindrical container.
A uniform mixed powder of a WC powder as a raw material of the cemented carbide constituting the portion and a Co powder as a binder is filled and spread thereon, and a diamond or CBN powder as a raw material of the ultra-high-hardness sintered body 17 portion is placed thereon. A uniform mixed powder of Co powder is filled, and then the container is charged into an ultra-high pressure and high temperature generator to sinter the above raw materials under high temperature and high pressure. A large-diameter disc-shaped layered sintered body composed of the super-hardened sintered body 17 as a main component is formed. Then, the layered sintered body is cut to form a substantially triangular cutting blade member 14 slightly larger than the bottom surface of the concave portion 13. At the time of this cutting, the cutting blade member 1
4 may be formed so as to be inclined so as to gradually project outward from the hard sintered body 16 toward the ultra-hard sintered body 17.

On the other hand, the base metal 11 is filled with a uniform mixed powder of the WC powder and the Co powder into a mold and pressed to form a green compact as a prototype of the base metal 11, which is charged into a furnace. It is formed by sintering. The cutting blade member 14 is inserted into a concave portion 13 formed in a corner portion 12 on the upper surface of the base metal 11, and the flank portion 18 is entirely formed on the base metal 1.
1 so as to protrude outward from the flank portion 20,
It is fixed by brazing with silver brazing or the like. Next, the flank portion 18 of the cutting blade member 14 is ground to form the cutting blade 19. However, when the positive flank surface 22 is formed when the cutting blade member 14 is cut as described above. Is the only part of the flank surface part 18 which is the ultra-high hardness sintered body 17,
What is necessary is just to grind in parallel with the flank 20 of the base metal 11. On the other hand, if not, the flank 1 of the cutting blade member 14
8, the portion on the side of the hard sintered body 16 is ground at the inclination angle θ to form the positive flank 22, and the portion of the ultra-hard sintered body 17 is formed on the flank 20 of the base metal 11. The negative flank 21 may be formed by grinding in parallel, that is, perpendicularly to the upper surface to be the rake face, and the cutting edge 19 may be formed at the intersection ridge line between the negative flank 21 and the upper surface.

However, in the chip of the present embodiment manufactured as described above, first, the flank portion 1 of the cutting blade member 14 is formed.
8 protrudes outward with respect to the flank portion 20 of the base metal 11, so that when the flank portion 18 is formed by grinding with a grinding wheel, or when the cutting blade 19 is polished again, It is possible to prevent a situation in which the grinding stone comes into contact with the flank surface portion 20 of the base metal 11 to cause clogging or a chip to generate a grinding crack. In particular, when the cutting edge 19 is worn, this flank portion 18
When the cutting edge 19 is re-ground by re-grinding, the flank portion of the cutting blade member 14 is perpendicular to the upper surface serving as the rake face, that is, parallel to the flank portion 20 of the base metal 11. 1
In this case, the grinding wheel is not in contact with the flank portion 20 of the base metal 11 and, of course, on the flank portion 18 of the cutting blade member 14. On the other hand, since the positive flank 22 is formed,
In the initial re-polishing, only the upper portion of the hard sintered body 16 is ground, and the grinding width gradually increases with each re-polishing. The amount of grinding can be reduced compared to the case where the entire flank of the cutting edge member is ground after the initial re-polishing like a tip, so that clogging of the grinding wheel and grinding cracks are more effective. In addition to this, it is possible to simplify the grinding operation and shorten the operation time at the time of re-polishing.

Further, in the chip of the present embodiment, the flank portion 18 of the cutting edge member 14 does not have a step, and the hard flank 21 is formed on the negative flank 21 of the ultra-hard sinter 17. The 16 flank portions 22 intersect at an obtuse angle to form the flank portion 18. In addition, the inclination angle θ of the positive flank 22 with respect to the flank 20 of the base metal 11
Is set as extremely small as 1.5 ° or less, and the protrusion amount ε of the intersecting ridge portion 23 of the cutting blade member 14 projecting from the flank portion 20 of the base metal 11 is also set as small as less than 0.05 mm. The cutting blade member 14 on which the cutting blade 19 is formed
Of the ultra-high hardness sintered body 17
It is in a state of being supported by the part and the base metal 11. Therefore, even if an excessive load or an impact load acts on the cutting edge 19 during cutting, the hard sintered body 16 portion and the base metal 11 having higher toughness than the ultra-high hardness sintered body 17 cause Such a load is dispersed and absorbed to some extent, and the load can be prevented from being concentrated on the ultra-high-hardness sintered body 17. The cutting blade 1 due to such an excessive load or an impact load can be avoided.
9 can be prevented from being lost, and the life of the insert can be extended, and stable cutting can be promoted. Moreover, the flank connected to the cutting edge 19 is a negative flank 21.
However, since the cutting edge 19 has a 90 ° included angle, it is possible to further prevent the cutting edge 19 from being lost.

On the other hand, in the method of manufacturing a chip according to the present embodiment, the cutting blade member 14 is formed by forming the hard sintered body 16 and the ultra-high hardness sintered body 17 into a layer, and the escape of the cutting blade member 14 is performed. A positive flank 22 is formed on the surface portion 18, and
The cutting blade member 14 is fixed to the corner portion 12 of the base metal 11 and further forms a flank portion 18 of the cutting blade member 14.
In particular, by setting the inclination angle θ of the positive flank 22 to a very small value of 1.5 ° or less and the projecting amount ε of the intersecting ridge portion 23 to a very small value of less than 0.05 mm, the cutting edge 19 having the same size is provided. When manufacturing a chip, a general chip is manufactured in which the flank 7 of the cutting blade member 6 and the flank 8 of the base metal 1 are flush with each other as shown in FIGS. In this case, it is possible to use the mold for compacting the base metal 1 as it is.

That is, since the inclination angle θ and the projection amount ε are kept very small as described above, the cutting edge 19
The protrusion amount λ of the base metal 11 with respect to the flank portion 20 of the base metal 11 is also extremely small, and when the cutting edge 19 of the same dimension is set, the base metal 11 of the chip according to the present embodiment and the general chip Dimensional difference from the base metal 1 can also be kept small.
For this reason, the composition and the composition of the raw material powder of the green compact at the time of molding the base metal 11 are appropriately adjusted, and the shrinkage rate at the time of sintering is reduced even if the size of the green compact is the same. By increasing the range as long as it does not affect the properties of the cemented carbide,
The green compact for the base metal 11 of the chip of the present embodiment can be molded using the same compacting die as that of the general chip. Therefore, according to the manufacturing method of the present embodiment, it is not necessary to separately prepare a mold for molding the green compact for the base metal 11, that is, it is not necessary to newly invest in equipment. It is economical. However, in order to divert the die for compacting in this way, it is desirable that the protruding amount λ formed by the cutting blade 19 with respect to the flank 20 of the base metal 11 is also sufficiently small. In the present embodiment, it is set to 0.06 mm or less as described above.

The cutting blade member 14 is obtained by cutting a large-diameter disc-shaped layered sintered body into a triangular flat plate having a predetermined size, and fixing the same to the concave portion 13 of the base metal 11. The negative flank 21 and the positive flank 22 may be formed on the portion 18 by grinding, that is, since there is no need to provide a step on the flank portion 18 of the cutting blade member 14 cut out from the layered sintered body, Can be facilitated. In addition, when the positive flank 22 is formed at the time of cutting from the layered sintered body, only the negative flank 21 may be formed after the cutting blade member 14 is fixed. With regard to, it is sufficient to perform finish grinding if necessary, so that such a grinding step can be greatly simplified.

On the other hand, after the cutting edge member 14 is fixed to the base metal 11, the negative flank 21 and the positive flank 22 may be formed by grinding. Since there is no need to incline the side surface serving as the surface portion 18, cutting from the layered sintered body becomes easy, and the positive flank 22 is formed at a predetermined inclination angle θ and the projection amount ε.
It is possible to form with high precision. Even if the flank 18 of the cutting member 14 is formed in this manner, in the present embodiment, the intersection ridge 23 between the positive flank 22 of the flank 18 and the lower surface of the cutting member 14. Protrudes outward with respect to the flank surface portion 20 of the base metal 11 by an amount of projection ε, so that the intersection ridge line portion 23 and the flank surface portion 20 of the base metal 11 Since a gap is defined between the positive flank 22 when grinding,
It is possible to prevent the grinding wheel from interfering with the flank 20 of the base metal 11.

In the present embodiment, as described above, the flank portion 18 of the cutting blade member 14 is entirely projected outward with respect to the flank portion 20 of the base metal 11 so that the flank portion At 18, the crossing ridge 23 closest to the flank 20 of the base metal 11 projects with a protrusion amount ε from the flank 20, whereby the flank 18 of the cutting blade member 14 and the base 11 The flank portion 20 and the cutting blade member 14
As shown in FIG. 3, the protrusion amount ε is set to 0, and the positive flank 22 of the flank portion 18 of the cutting blade member 14 and the base metal are connected as shown in FIG. 11
May be directly and continuously connected to the flank surface portion 20. However, even in such a chip, the above-mentioned positive flank surface 22 becomes closer to the cutting blade 19 side.
The cutting edge 19 is formed at a position protruding outward with respect to the flank portion 20 because it is inclined so as to gradually project with respect to the flank portion 20 of the tip. In addition, the same effect as that described above can be obtained, and in particular, since the entire lower surface of the cutting blade member 14 is supported in close contact with the recess 13 of the base metal 11, the load acting on the cutting blade 19 can be more reliably absorbed and the cutting blade 19 Can be more effectively prevented. Further, in the present embodiment, in the flank portion 18 of the cutting blade member 14, the intersection ridge line between the negative flank 21 and the positive flank 22 is exactly the same as the super-high-hardness sintered body 17 and the hard sintered body 16. Although it is located at the boundary, it may be located closer to either one of the sintered bodies 16 and 17.

Further, in the above embodiment, in the case of a rhombic flat chip, one corner portion 1 on the upper surface of the base metal 11 is provided.
Although the case where the cutting blade 19 is formed by fixing the cutting blade member 14 only to the base member 2 has been described, for example, as shown in FIGS. 4 and 5, a pair of sharp corners 12 of a rhombic flat base metal 11 are formed. , 12 may be formed with a recess 13 to which the cutting blade member 14 is fixed, and one chip may be provided with two cutting blades 19, 19, as shown in FIGS. The cutting blades 19 may be formed by fixing the cutting blade members 14 to the acute corner portions 12 on the upper and lower surfaces. In this case, as shown in FIG.
4 may be fixed, and the cutting blade members 14, 14 may be fixed to alternate corners 12, 12 on the upper and lower surfaces. Further, as shown in FIGS. 8 and 9, the cutting blade members 1 are attached to all the sharp corners 12 on the upper and lower surfaces of the base metal 11.
4 may be fixed.

Further, the present invention is not limited to such a rhombic flat chip, but may be a square flat plate or a rectangular flat chip, for example. May be fixed. Further, as shown in FIG. 10, for example, as shown in FIG.
The cutting edge member 14 may be fixed to form the cutting edge member 14 to form the cutting edge 19, and even in such a triangular tip, the cutting edge member may be fixed to a plurality of corners to provide the cutting edge. be able to. In the modified examples shown in FIGS. 3 to 10, the same reference numerals are assigned to components common to the chips of the embodiment shown in FIGS.

[0030]

As described above, according to the tip of the present invention, it is possible to prevent the grinding wheel from being clogged and the grinding crack when forming the flank of the cutting blade member, and to facilitate the formation of the cutting blade member. Of course, in particular, in the case of re-polishing the cutting blade, the positive flank is formed, so that the contact of the grinding wheel to the hard sintered body portion of the cutting blade member is reduced. In addition, the amount of grinding and the working time can be reduced. In addition, by reducing the inclination angle of the flank portion of the cutting blade member and the amount of protrusion of the base metal to the flank portion, even if an excessive load or a shocking load acts on the cutting blade, this is reduced to some extent. The cutting edge can be absorbed, and the negative flank of the cutting edge secures a sufficient angle of the cutting edge, so that it is possible to effectively prevent the chipping of the cutting edge, thus extending the life of the insert and achieving stable cutting. Can be encouraged. On the other hand, according to the method for manufacturing a chip of the present invention,
As described above, it is possible to prevent clogging of the grinding wheel and grinding crack at the time of forming the flank portion of the cutting blade member, and to particularly suppress the inclination angle and the protrusion amount of the flank portion of the cutting blade member to a small value. With this, it is possible to produce a compact molding die for molding a die for a conventional chip as it is, to manufacture it at a low cost, and it is economical without having to prepare a new die. is there.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a chip of the present invention.

FIG. 2 is a side view of the chip shown in FIG.

FIG. 3 is a side view showing a modified example of the chip of the embodiment of FIG. 1;

FIG. 4 is a plan view showing a modification of the chip of the embodiment of FIG. 1;

FIG. 5 is a side view of the chip shown in FIG. 4;

FIG. 6 is a plan view showing a modification of the chip of the embodiment of FIG. 1;

FIG. 7 is a side view of the chip shown in FIG. 6;

FIG. 8 is a plan view showing a modification of the chip of the embodiment of FIG. 1;

9 is a side view of the chip shown in FIG.

FIG. 10 is a plan view showing a modification of the chip of the embodiment of FIG. 1;

FIG. 11 is a plan view of a conventional chip.

FIG. 12 is a side view of the chip shown in FIG. 11;

FIG. 13 is a plan view of a conventional chip.

FIG. 14 is a side view of the chip shown in FIG.

FIG. 15 is a plan view of a conventional chip.

FIG. 16 is a side view of the chip shown in FIG.

[Explanation of symbols]

REFERENCE SIGNS LIST 11 base metal 12 corner portion 14 cutting blade member 16 hard sintered body 17 ultra-high hardness sintered body 18 flank surface portion of cutting blade member 19 cutting blade 20 flank surface of base metal 11 21 negative flank 22 positive flank 23 Intersecting ridge line between flank portion 18 and lower surface of cutting blade member 14 ε Projecting amount of intersecting ridge line portion 23 of cutting blade member 14 with respect to flank surface 20 of base metal 11 λ Cutting of flank surface 20 of base metal 11 Projection amount of blade 19 θ Angle of inclination of positive flank 22 of cutting blade member 14 with respect to flank 20 of base metal 11

Claims (8)

[Claims] 1. A cutting blade member formed by forming a hard sintered body such as a cemented carbide and a super-hardened sintered body such as diamond or CBN into a layer at least at one of the corners of a base metal. And, in a throwaway tip in which a cutting edge is formed on a side ridge of a rake face provided in the ultra-high hardness sintered body portion of the cutting blade member, a flank portion of the cutting blade member includes:
A negative flank extending parallel to the flank of the base and connected to the cutting blade; and the negative flank interposed between the negative flank and the opposite side of the cutting blade. And a positive flank inclined so as to gradually project outward with respect to the flank portion of the insert. 2. The flank of the cutting blade member, wherein the positive flank forms an angle of inclination of 1.5 ° or less with respect to the flank of the base metal. Item 4. The throw-away tip according to Item 1. 3. The flank of the cutting blade member, wherein the protrusion of the base from the flank at a position closest to the flank of the base is less than 0.05 mm. The throw-away tip according to claim 1 or 2, wherein: 4. A cutting blade member formed by forming a hard sintered body such as a cemented carbide and a super-hardened sintered body such as diamond or CBN into a layer is formed, and a flank portion of the cutting blade member is formed. The cutting edge is formed by inclining and shaping so as to gradually protrude outwardly toward the rake face provided on the ultra-high hardness sintered body portion to form a positive flank on the flank portion of the cutting blade member. The member is fixed to at least one of the corners of the base metal so that the flank of the cutting blade member projects outside the flank of the base metal. A portion on the rake face side of the face portion is formed in parallel with the flank face portion of the base metal to form a negative flank face, and a cutting edge is formed at an intersection ridge line portion between the negative flank face and the rake face. A method for manufacturing a throw-away tip. 5. The method according to claim 5, wherein the positive flank is formed when the cutting blade member is formed from a layered sintered body obtained by sintering the hard sintered body and the super-hard hardness sintered body in layers. The method for manufacturing a throw-away tip according to claim 4. 6. The method according to claim 4, wherein the positive flank is formed after the cutting edge member is fixed to a corner of the base metal. 7. The flank of the cutting blade member, wherein the positive flank forms an inclination angle of 1.5 ° or less with respect to the flank of the base metal. A method for manufacturing the indexable insert according to claim 6. 8. The flank of the cutting blade member, wherein the amount of protrusion of the buckle from the flank at a position closest to the flank of the base is less than 0.05 mm. A method for manufacturing a throw-away tip according to any one of claims 4 to 7.