JP4529620B2 - Method of manufacturing cutting blade member of cutting tool and press molding die of green compact used in the manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a cutting blade member of a cutting tool such as a throw-away tip that is provided with a cutting blade and is detachably mounted on the main body of the cutting tool, and compresses the raw material powder of such a cutting blade member. The present invention relates to a green compact press-molding die used in the manufacturing method in the case of manufacturing from a green compact.

  As a manufacturing method of the cutting blade member of such a cutting tool, for example, as a manufacturing method of the above throwaway tip in Patent Document 1, a rectangular flat plate-shaped chip body 1 as shown in FIG. Of the four peripheral surfaces arranged around the flat plate surface 2, a pair of peripheral surfaces positioned on the opposite sides is a rake surface 3, and the rake surface 3 intersects the flat plate surface 2 as a flank surface. A so-called vertical blade type throw-away tip manufacturing method in which the ridge line is the cutting edge 4 has been proposed. That is, in the manufacturing method described in Patent Document 1, the upper and lower punches that face each other in the direction perpendicular to the direction corresponding to the thickness direction (vertical direction in FIG. Using a press molding die provided with a die which is disposed so as to surround the upper and lower punches which are moved up and down and which defines a cavity between the upper and lower punches. The raw powder of the throw-away tip such as cemented carbide introduced in is compressed by upper and lower punches, and the green compact is press-molded.

In the throw-away tip, the crossed ridge line between the other peripheral surface 5 adjacent to the rake face 3 of the peripheral surface of the tip body 1 and the rake face 3 is also used as the cutting edge 6. In this case, the other peripheral surface 5 is used as a flank of the cutting edge 6, and the rake face 3 where the intersecting ridgelines where the cutting edge 4 and the cutting edge 6 are formed intersect each other is formed. In the corner portion, a 1/4 convex arc-shaped corner portion 7 smoothly connected to the cutting edges 4 and 6 is formed, and accordingly, the other peripheral surface 5 and the flat plate serving as a flank of the cutting edge 6. The intersecting ridge line portion with the surface 2 is a corner ridge line portion 8 having a convex curved surface shape such as a quarter convex arc. In addition, the throw-away tip described in Patent Document 1 is arranged in a direction in which the rake face 3 and the flat plate surface 2 and the other peripheral surface 5 serving as the flank face are orthogonal to each other via the cutting edges 4 and 6. Further, it is a throw-away tip with a breaker in which a chip breaker 9 is formed on the rake face 3. Further, in Patent Document 1, a pin is provided in the cavity so as to be able to protrude and retract in a direction corresponding to the thickness direction, and a clamp screw or the like is inserted when the throw-away tip is attached to the tool body. A through hole to be the mounting hole 10 is formed in the green compact.
Japanese Patent Laid-Open No. 10-146695

  However, as described in Patent Document 1, the green compact formed on the vertical blade type throw-away tip moves up and down facing each other in a direction perpendicular to the direction corresponding to the thickness direction of the tip body 1. If the upper and lower punches are used for press molding, the size of the green compact in the direction of compression becomes larger than the thickness of the green compact, which may make it difficult to uniformly compress the raw material powder. It was. In particular, in the manufacturing method and press-molding die described in Patent Document 1, the mounting hole 10 that penetrates the chip body 1 in the thickness direction is formed, so that the direction corresponding to the thickness direction as described above, that is, A pin is provided in the cavity in a direction perpendicular to the compression direction by the upper and lower punches, and when the raw material powder is compressed, the compression ratio of the raw material powder changes slightly around this pin. Even in the manufactured throw-away tip, there is a possibility that deformation such as minute irregularities may occur around the mounting hole 10 or the hole shape itself of the mounting hole 10 may become an ellipse.

  In addition, in the case of a substantially triangular, quadrilateral or more polygonal flat plate chip body, such as a vertical blade type throwaway tip for grooving, when three, four or more peripheral surfaces are raked surfaces Therefore, it is extremely difficult to press-mold the green compact by compressing the raw material powder in a direction perpendicular to the direction corresponding to the thickness direction of the chip body. After sintering, the rake face or the like must be ground into a desired shape with a grindstone, or a sintered material must be molded by an injection molding method. However, in the former case, it takes a great deal of time and labor for grinding, and in the latter case, the binder contained together with the raw material powder in the sintered material, a high shape in the throw-away tip after production, There is a possibility that dimensional accuracy cannot be obtained.

  Therefore, the inventor of the present invention previously described in Japanese Patent Application No. 2003-424212, as a method for manufacturing a cutting blade member of a cutting tool including such a throw-away tip, the die outside the cavity in the above press mold. By forming a recess that retreats toward the surface and filling the recess with the raw material powder that is compressed by the punch, the portion formed by the die in the green compact is adjacent to the direction in which the punch is separated Proposing to form a protrusion that is relatively convex with respect to the portion to be performed. Therefore, for example, when the green compact manufactured on the above-described vertical blade type throw-away tip is press-molded, the punches are opposed to each other in a direction corresponding to the thickness direction of the tip body 1. As a result, the raw material powder is compressed in the direction of the thickness dimension smaller than the vertical and horizontal dimensions of the flat plate surface 2, and even when the mounting hole 10 is formed, the pin is moved along this compression direction. Since it suffices to make it appear and disappear in the cavity, uniform raw material powder can be compressed, and a throw-away tip with high shape and dimensional accuracy can be manufactured. Even when the raw material powder is compressed in the direction corresponding to the thickness direction of the chip body 1 as described above, the protrusion can be formed in the portion corresponding to the peripheral surface of the chip body by the concave portion. Even if the breaker 9 or the corner ridgeline portion 8 has a peripheral surface that becomes the rake face 3 of the chip body 1 or a portion that is relatively convex with respect to a portion adjacent to the other peripheral surface 5 in the thickness direction. It becomes possible to mold a green compact having a shape corresponding to this.

  However, even in such a manufacturing method and a press mold, for example, the amount of retreat of the recess is large, or the shape of the chip breaker 9 formed on the rake face 3 of the chip body 1 is complicated. If the bottom surface of the concave portion formed in the die is complicatedly uneven, it becomes difficult to uniformly pack the raw material powder only by the compression by the punch in the concave portion. When extremely high accuracy is required for the chip, there is a possibility that this cannot be sufficiently satisfied. Further, not only the above-mentioned vertical blade type throw-away tip, but also a cutting blade member used in a cutting tool has been used in more complex shapes in recent years. Although it was supposed that it could only be manufactured from a sintered material molded by an injection molding method, it is difficult to produce a cutting blade member having a high shape and dimensional accuracy as described above, and injection Due to the high cost of a molding die and a molding apparatus, it has been required to manufacture such a cutting blade member by press molding of a green compact with a press molding die.

  The present invention has been made under such a background. In addition to the above-described vertical blade type throw-away tip, the present invention is capable of press forming raw material powder even with a cutting blade member of a cutting tool having a more complicated shape. The present invention provides a method for manufacturing a cutting blade member of a cutting tool that can be manufactured with extremely high accuracy from a green compact produced by the above-mentioned method, and provides a green compact press mold suitable for use in such a manufacturing method. It is aimed.

In order to solve the above-described problems and achieve such an object, a method for manufacturing a cutting blade member of a cutting tool according to the present invention is close to a plurality of main punches that are opposed to each other and relatively separated from each other. Manufactured into a cutting blade member of a cutting tool by compressing the raw material powder put into this press molding die using a press molding die provided with a die arranged so as to surround the periphery of these main punches A method of manufacturing a cutting blade member of a cutting tool for press-molding a green compact, wherein the die is separated from a cavity of the press-molding die from a direction different from the direction of separation of the main punch. A secondary punch to be contacted is provided, and the green compact is press-molded by compressing the raw material powder by approaching the secondary punch toward the cavity and by compressing the raw material powder by approaching the main punches. To do And features. The green compact press-molding die of the present invention is a green compact press-molding die used in such a method of manufacturing a cutting blade member of a cutting tool, and is relatively opposed to each other. a plurality of main punch brought into contact, and the die disposed so as to surround the periphery of the main punch in close proximity, provided in the die, the release of the main punch against the cavity of the press-molding die A sub-punch that is separated from a direction different from the contact direction and compresses the raw material powder charged into the press mold together with the main punch is provided.

  In such a manufacturing method of a cutting blade member of a cutting tool and a press molding die of a green compact used in the manufacturing method, the sub punch is cavityd from a direction different from the contact direction of the main punches facing and separating from each other. By separating toward and away from the tee, the raw material powder charged into the cavity can be compressed from directions other than the direction of separation and contact of the main punch, so that the raw material powder is simulated in multiple directions in the cavity. And isotropically compressed into a green compact. Therefore, even when manufacturing a cutting blade member having a complicated shape, this part is compressed by pressing the raw powder together with the main punch by moving the sub punch away from the main punch toward the complicated part. Therefore, according to the present invention, it is possible to produce a cutting blade member with extremely high accuracy even by press molding simply by sintering the green compact. Thus, the manufacturing cost of such a cutting blade member can be reduced and the manufacturing efficiency can be improved.

  For example, the cutting blade member includes a chip body having a substantially flat plate shape, and includes a flat plate surface facing the thickness direction of the chip main body and a peripheral surface arranged around the flat plate surface. The above-mentioned vertical blade in which a cutting edge is formed on at least one of the intersecting ridgeline between the formed rake face and the flat plate surface, and the other peripheral surface adjacent to the rake face and the rake face. In the case of a throw-away tip of the type, the main punch is moved away from and in a direction corresponding to the thickness direction, and at least a part of the surface corresponding to the flat plate surface of the chip body is formed in the green compact. By doing so, since the raw material powder is compressed in the direction corresponding to the thickness direction having a small size and the green compact is press-molded, the compression of the raw material powder is first made uniform in the contact / separation direction of the main punch. Various planes that can Throw-away tip shape becomes possible production. Further, in the press molding die, a mounting hole penetrating the chip body in the thickness direction is formed by providing the main punch with a pin that can be projected and retracted in the cavity in the direction of separation of the main punch. Even in this case, since the raw material powder is compressed in the protruding direction of the pin, the change in the compression ratio around the pin can be suppressed.

  Further, by forming at least a part of the surface corresponding to the peripheral surface of the chip body in the green compact by the secondary punch, the secondary punch is brought closer to the surface corresponding to the surface corresponding to the peripheral surface. The raw material powder can be isotropically compressed from a plurality of directions together with the main punch, and the compression with the portion compressed by the main punch is ensured even around this surface while the raw material powder is reliably packed. be able to. That is, by forming at least a part of the surface corresponding to the peripheral surface of the chip body on which the rake face is formed in the green compact by the sub punch, the periphery of the surface of the green compact corresponding to the rake face is formed. Can be formed by uniformly compressing, and if at least a part of the surface corresponding to the other peripheral surface of the chip body is formed in the green compact, the green compact corresponding to the other peripheral surface can be formed. The periphery of the surface can be uniformly compressed and molded. Of course, at least a part of each side of the green compact corresponding to the rake face and the other peripheral surface may be formed with a secondary punch. May be formed with these main and sub punches. In contrast, at least one of the main punch and the sub punch may be formed by forming only a part of the surface of the green compact on which the punch is formed, and the remaining part may be formed by a die. .

  For this reason, even if a chip breaker having a complicated shape is formed on the rake face, or the intersection ridge line portion between the other peripheral surface and the flat plate surface is a convex curved corner ridge line portion, the press molding is performed. In the mold, such a chip breaker and a corner ridge line portion are provided by forming at least one of a concave portion retreating with respect to the cavity and a convex portion projecting toward the cavity in the sub punch. Further, the periphery of the surface of the green compact corresponding to the peripheral surface of the chip body can be more uniformly compressed and molded. For example, when a chip breaker that is uneven on the rake face of the chip body is formed, a convex part and a concave part are formed on the secondary punch that molds the surface corresponding to the peripheral surface on which the rake face is formed in the green compact. In the surface of the green compact, irregularities are formed in a portion that becomes a chip breaker, and the corner ridge line portion of the chip body is formed in a convex curved surface so as to be relatively relative to the adjacent portion in the thickness direction. When the convex part is formed on the other peripheral surface, the part corresponding to the corner ridge line part is formed on the auxiliary punch that forms the surface corresponding to the other peripheral surface in the green compact. A concave portion is formed so that the portion to be formed becomes a concave curved surface.

  Therefore, according to the manufacturing method and the press mold of the above configuration, in the case of pressing the green compact manufactured to such a chip breaker, a corner ridge line portion, or a vertical blade type throwaway tip having a mounting hole. Even if the chip breaker or the shape of the concave portion on the side of the press mold for molding the part corresponding to the corner ridge line portion is large or the concave bottom surface is complicatedly uneven, the chip breaker or Including the peripheral surface where the corner ridge line portion is formed and the portion corresponding to the periphery of the mounting hole, it is possible to achieve more uniform uniformization of the raw material powder compression in the whole green compact. Thus, a high-precision vertical blade type throw-away tip having a chip breaker, a flank face and a corner ridge line portion, etc., accurately formed into a predetermined shape while preventing slight deformation and distortion after sintering. Thus, it is possible to produce economically and efficiently from the pressed compact. Further, in particular, the above-mentioned cutting blade member has the highest accuracy by forming the surface corresponding to the peripheral surface to be the rake face or the flank face of the chip body with the secondary punch in the green compact as described above. Since the raw material powder can be uniformly compressed at the green compact portion corresponding to the required periphery of the cutting blade, it is possible to provide a cutting blade member capable of high-precision cutting.

  Furthermore, in the production method of the present invention, the sub-punch is compressed after the main punch approaches 50% or more of the moving amount approaching from the start of compression of the raw material powder to the end of compression. By making it finish, it becomes possible to more reliably compress the raw material powder from a direction different from the direction of separation of the main punch by this sub punch, and it is possible to manufacture a cutting blade member with higher accuracy. That is, when the compression of the raw material powder by the secondary punch is completed at an initial stage where the amount of movement of the primary punch is less than 50%, the primary punch is positioned when the secondary punch is positioned close to the cavity. There is a possibility that the raw material powder is compressed and the raw material powder is not sufficiently compressed by the sub punch. Note that the compression of the raw material powder by the sub punch may be completed at the same time as the main punch, or may be completed after the compression by the main punch is completed.

  In addition, after the raw material powder is introduced between the main punches, the sub punch is once separated from the cavity and then approached so as to compress the raw material powder. The raw material powder can be drawn to the side where the sub-punch is once separated while synchronizing with the movement of. Since the raw material powder drawn in this way can be compressed by being pushed toward the cavity by the approach of the sub punch, it is possible to further uniform the compression of the raw material powder.

  On the other hand, in the press molding die, the main punch and the sub punch are arranged at intervals from each other at the compression end position of the raw material powder, for example, at least one of the main punch and the sub punch. Even if an error occurs in the stroke of the separation / contact, it is possible to prevent the occurrence of such a situation that they are contacted and damaged. In this case, a cavity is formed by the die at the interval portion, and the green compact is formed. However, it is desirable that this interval be in the range of 0.01 mm to 5 mm. If the interval is narrower than this, the main punch and the sub punch may interfere with each other and cause damage. Conversely, the interval is larger than this. If it is too wide, the portion formed by the die that does not come in contact with the green compact becomes too large as described above, and the uniform compression effect of the raw material powder by the main and sub punches that come in contact in different directions can be sufficiently obtained. There is a risk of disappearing.

  Further, instead of providing a space between the main and sub punches at the compression end position in this way, one of the main punch and sub punch is connected to the other punch at the compression end position of the raw material powder. By forming the slidable contact surface to slidably extend in the direction in which the other punch is separated, after the compression by the approach of the one punch is finished, the other punch is brought into slidable contact with the slidable surface. The raw material powder may be compressed by bringing the other punch closer. In this case, since the green compact is not formed by the die that does not come in contact as described above in the vicinity of the portion where the main and sub punches are in sliding contact, a more reliable uniform compression effect of the raw material powder can be obtained. . However, if the width of the slidable contact surface in the direction of separation of the other punch is too small, especially when a recess is formed in one punch connected to the slidable contact surface, the recess and the die of one punch There is a possibility that the gap between the sliding contact surface becomes too small and there is a risk of chipping or the like around the sliding contact surface. Conversely, even if the width of the sliding contact surface is too large, one punch reaches the compression end position and is positioned. Since the amount of movement of the other punch after being increased increases and the uniform compression effect by this one punch may be impaired, the width of the sliding contact surface is in the range of 0.1 mm to 5 mm. Is desirable.

  Although depending on the shape of the green compact to be molded, etc., considering the design of the press mold and the punch driving means of the molding apparatus, the sub-punch is in a direction perpendicular to the separation / contact direction of the main punch. For example, when the main punch is separated in the vertical direction, the sub punch is separated in the horizontal direction. The drive means can be easily designed. In addition, when a part of the green compact is formed by a die as described above, when a portion that is uneven with respect to the cavity along the contact direction of the main and sub punches is formed on the die, The die is divided with the cavity interposed therebetween, and at least a part of the die is separable, so that the press-molded green compact can be easily taken out. However, even in this case, considering the ease of die design, at least a part of the divided dies is in a direction parallel to the separation direction of the main punch or perpendicular to the separation direction of the main punch. It is desirable that the secondary punch be separable in a specific direction, particularly when at least a part of the die is separable in a direction perpendicular to the direction of the main punch. In this case, it is desirable that at least a part of the divided dies be separable in a direction parallel to or perpendicular to the separing direction of the sub punch. . Further, if at least one of the main punch and the sub punch is constituted by a plurality of divided punches, the raw material powder filling amount and the compression ratio in the separation / contact direction among the surfaces of the green compact formed by the punches. Thus, it becomes possible to obtain a green compact with a more uniform density.

  1 to 3 show a first embodiment of a press molding die of the present invention, and FIG. 4 shows a method for manufacturing a cutting blade member of a cutting tool of the present invention using such a press molding die. The cutting blade member manufactured by one Embodiment of this is shown. Here, the cutting blade member has substantially the same configuration as the vertical blade type throw-away tip shown in FIG. 24, and has a substantially rectangular flat plate-shaped tip body 1. A pair of flat plate surfaces 2 that form a square shape in the thickness direction (vertical direction in FIG. 4) and four peripheral surfaces arranged around the flat plate surface 2, and between the pair of flat plate surfaces 2 , That is, the dimension in the thickness direction of the chip body 1 is made smaller than the distance between the four peripheral surfaces located on opposite sides, that is, the width dimension and the length dimension of the chip body 1. .

  Further, of these four peripheral surfaces, a pair of peripheral surfaces (peripheral surfaces on the left front side and the right rear side in FIG. 4) which are opposite to each other are used as a rake face 3, and the rake face 3 and the flat plate surface. The cutting edge 4 is formed on the intersecting ridge line with 2, and the cutting edge 6 is formed on the intersecting ridge line between the rake face 3 and the remaining pair of other peripheral surfaces (left and right peripheral surfaces in FIG. 4). The flat plate surface 2 and the other peripheral surface 5 are flank surfaces for the cutting edges 4 and 6, respectively. Further, the corner portion 7 where the cutting edges 4 and 6 intersect is formed in a ¼ convex arc shape, and accordingly, the intersecting ridge line portion between the flat plate surface 2 and the other peripheral surface 5 also has a cross section parallel to the rake face 3. The corner ridge line portion 8 is a convex curved surface forming a ¼ convex arc. However, the rake face 3 is not formed with the chip breaker 9 as shown in FIG. 24, and is a flat face perpendicular to the flat plate face 2, the other peripheral face 5, and the corner ridge line portion 8 as a flank face. Yes. Further, an attachment hole 10 that penetrates the chip body 1 in the thickness direction is formed between the centers of the pair of flat plate surfaces 2. Such a throw-away tip is the same shape as the tip body 1, and the green compact whose dimensions are increased by the contraction allowance during sintering is applied from the raw material powder of the cutting blade member such as cemented carbide. It is manufactured by press-molding and sintering with the above-mentioned press-molding mold.

  The press-molding dies of this embodiment for producing such a throw-away tip as a cutting blade member by press-molding such a green compact are not shown facing each other as shown in FIGS. A plurality of main punches 11 and 12 that are relatively separated from each other by the driving means, a die 13 disposed so as to surround the main punches 11 and 12 that are close to each other, and the die 13 are provided. A sub-punch 15 that is separated from a direction different from the direction in which the main punches 11 and 12 are separated from each other toward the cavity 14 defined between the adjacent main punches 11 and 12 is provided. Here, in this embodiment, the main punches 11 and 12 are arranged so as to be separated from each other in the vertical direction as shown in the figure, while the sub punch 15 is a direction perpendicular to the separation and contact direction of the main punches 11 and 12. That is, they are separated from each other toward the cavity 14 in the horizontal direction. Further, in the present embodiment, the pair of sub punches 15 are arranged so as to face each other on a straight line so as to sandwich the cavity 14 therebetween, and are arranged so as to be in contact with and separated from the cavity 14 along the straight line. Yes.

  The vertical direction in which the main punches 11 and 12 are separated from each other is a direction corresponding to the thickness direction when the chip body 1 is sintered in the green compact to be press-molded. , 12 approach each other, the raw material powder introduced between the main punches 11, 12 is pressed and compressed by the press surfaces 11A, 12A of the main punches 11, 12 facing each other, and the chip body in the green compact A surface corresponding to the flat plate surface 2 is formed. In the present embodiment, the direction in which the pair of sub punches 15 are separated from each other is the direction facing the surface corresponding to the peripheral surface on which the rake face 3 of the chip body 1 is formed in the green compact. As the pair of sub-punches 15 approach toward the cavity 14, a surface corresponding to the rake face 3 is formed in the green compact. Therefore, the pressing surface 15A facing the cavity 14 side of the sub punch 15 has a shape substantially equal to the surface corresponding to the rake face 3 of the chip body 1 in the green compact, that is, the corners of the four corners of the horizontally long rectangle. The part is shaped to be chamfered by a 1/4 convex arc.

  On the other hand, the surface side of the green compact corresponding to the other peripheral surface 5 of the chip body 1 is formed by the die 13 in this embodiment. That is, as shown in FIG. 2, the die 13 has a cavity 14 defined between the adjacent main punches 11 and 12, and the separation direction of the main punches 11 and 12 and the separation of the sub punch 15. A recessed portion 16 that is recessed outward is formed in a direction perpendicular to the contact direction (the left-right direction in FIG. 2, the direction orthogonal to the drawing in FIG. 1), and faces the inside of the cavity 14 of the recessed portion 16. The bottom surface 16A is a flat surface parallel to the contact / separation direction of the main punches 11 and 12 and the contact / separation direction of the sub-punch 15, and the bottom surface 16A forms the green compact on the other peripheral surface 5 of the chip body 1. The corresponding surface is molded. Further, on both edges of the concave portion 16 on the side of the main punches 11 and 12, a concave curved wall surface 16 </ b> B extending inwardly of the cavity 14 is formed in a concave arc shape that is smoothly connected to the bottom surface 16 </ b> A. These wall portions 16B are formed on the press surfaces of the main punches 11 and 12 when the cavities 14 are formed when the main punches 11 and 12 are positioned close to each other during press molding. The portion corresponding to the corner ridge line portion 8 of the chip body 1 is molded in the green compact.

  Here, as shown in FIG. 3A, the wall surface 16B may have a cross section of less than ¼ arc. In this case, the press surfaces 11A of the main punches 11 and 12 A concave curved surface portion 17 having an arcuate cross section that is smoothly connected to the wall surface 16B in a state in which the main punches 11 and 12 are positioned as described above and the cavity 14 is formed is formed on both side edges on the concave portion 16 side of 12A. The concave curved surface portion 17 and the wall surface 16B form a convex curved surface having a ¼ arc in cross section corresponding to the corner ridge line portion 8 in the green compact. Therefore, in this case, in the green compact, all of the flat plate surface 2 of the chip body 1 and a portion corresponding to a part of the corner ridge line portion 8 on the flat plate surface 2 side are formed by the main punches 11 and 12, and the corners are formed. The remainder of the ridge line portion 8 and the portion corresponding to the other peripheral surface 5 are formed by the die 13. In this case, it is desirable that the crossing angle α formed by the outer peripheral surface 18 of the main punches 11 and 12 slidably contacting the die 13 on the concave curved surface portion 17 side and the concave curved surface portion 17 is 45 ° or more. If the crossing angle α is smaller than the above, the crossing ridge line portion between the concave curved surface portion 17 and the outer peripheral surface 18 becomes too acute, and there is a possibility that a defect is generated.

  Further, the wall surface 16B may be a concave curved surface whose cross section is exactly a ¼ arc as shown in FIG. 3B. In this case, the press surface 11A of the main punches 11 and 12 is used. , 12A is not formed, and the crossing angle α between the press surfaces 11A, 12A and the outer peripheral surface 18 of the main punches 11, 12 is 90 °. From the surface 5 to the portion corresponding to the entire corner ridge line portion 8 is formed by the concave portion 16 of the die 13. Further, the wall surface 16B may be formed so that its cross section extends over a 1/4 arc and extends in a direction perpendicular to the contact / separation direction of the main punches 11 and 12, as shown in FIG. Also in this case, the concave curved surface portion 17 as described above is not formed on the press surfaces 11A and 12A of the main punches 11 and 12, and the crossing angle α between the press surfaces 11A and 12A and the outer peripheral surface 18 is 90 °. In this case, in the green compact, the concave portion 16 of the die 13 extends from the other peripheral surface 5 to the portion corresponding to the edge on the other peripheral surface 5 side beyond the corner ridgeline portion 8. Thus, the main punches 11 and 12 form only a portion corresponding to a part between the edges of the flat plate surface 2 in the green compact.

  Of these main punches 11, 12, in this embodiment, the lower main punch 12 has a pin 19 that can be projected and retracted in the cavity 14 in the direction of separation of the main punches 11, 12. It is provided. The pin 19 forms a through hole corresponding to the mounting hole 10 of the chip body 1 in the green compact, has a cylindrical shape, and opens at the center of the press surface 12A of the lower main punch 12. It is inserted into the circular hole 12B formed as described above, and is driven independently of the main punch 12 so as to protrude and protrude upward from the press surface 12A. On the other hand, a circular hole 11B is formed in the upper main punch 11 so as to open at the center of the press surface 11A, and protrudes into a cavity 14 defined between the adjacent main punches 11 and 12. The tip (upper end) portion of the pin 19 is inserted and accommodated in the circular hole 11B of the upper main punch 11.

  The die 13 is divided with the cavity 14 therebetween, and can be separated from and connected to the die 13. That is, in the present embodiment, the die 13 is separated from the main punches 11 and 12 by the dividing surface P positioned substantially at the center of the cavity 14 in the direction of separation of the main punches 11 and 12, as shown in FIG. The split surface P is a plane perpendicular to the contact / separation direction of the main punches 11 and 12. These divided dies 13A and 13B are separated from each other in a direction parallel to the direction of separation of the main punches 11 and 12 independently of the separation and contact of the main punches 11 and 12 and the protrusions and depressions of the pins 19. It is possible. One of the divided dies (for example, the lower divided die 13B) fixes the position of the main punches 11 and 12 together with the sub-punch 15 and fixes the other divided die (for example, the upper divided die 13B). Only the split die 13A) may be separated.

  Next, one embodiment of the method for manufacturing the cutting blade member of the cutting tool of the present invention in the case where the green compact manufactured on the above-mentioned vertical blade type throw-away tip is formed by the press molding die configured as described above. The form will be described with reference to FIG. 5. First, as shown in FIG. 5A, the divided dies 13 </ b> A and 13 </ b> B are brought close to each other to form the die 13, and the lower main punch 12 is moved from the position where the cavity 14 is formed. The upper punch 11 is separated from the die 13 with the auxiliary punch 15 approached to the position of the cavity 14 while being separated from the die 13, and a cemented carbide or a TiC- containing WC as a main component is opened from the opening. A raw material powder such as cermet containing TiN as a main component is charged so that a predetermined amount is filled. At this time, the pin 19 is protruded from the press surface 12A of the lower main punch 12 so that the upper end thereof has a height substantially equal to that of the charged raw material powder.

  Next, as shown in FIG. 5 (b), the upper main punch 11 approaches the lower main punch 12 and is inserted into the die 13 while being inserted into the circular hole 11B to move forward (lower). At this time, however, the lower main punch 12 is retracted away from the approaching upper main punch 11 and the sub punch 15 is also retracted away from the cavity 14 side. The raw material powder is filled so that the main punch 12 and the sub punch 15 are drawn into the retracted space, and the raw material powder transfer step before the compression step is completed. Then, when the upper main punch 11 advances to a predetermined position, the lower main punch 12 approaches and moves upward (rises) toward the upper main punch 11, and the sub punch 15 also faces the cavity 14 side. The raw powder is compressed together with the main punches 11 and 12 by moving forward so that a cavity 14 having a predetermined shape is defined as shown in FIG. The green compact corresponding to the shape is pressed. That is, at least a part of the surface corresponding to the flat plate surface 2 of the chip body 1 in the green compact is formed by the main punches 11 and 12, and the surface corresponding to the rake face 3 is formed by the sub punch 15, and the remaining portions are formed. Portions such as surfaces corresponding to other peripheral surfaces 5 are formed by the die 13.

  At this time, the compression of the raw material powder due to the approach of the sub punch 15 to the cavity 14 is 50% or more of the moving amount approaching from the time when the main punches 11 and 12 start to compress the raw material powder to the end of the compression. It is set to end after moving. That is, as shown in FIG. 5 (b), the time when the upper main punch 11 descends while the lower main punch 12 recedes and pulls the raw material powder and then moves forward (rises), the main punch 11 , 12 is started, and as shown in FIG. 5C, the upper and lower main punches 11, 12 approach each other to define the cavity 14 having the predetermined shape, and the compression ends. At this time, the amount of movement of the main punches 11 and 12 from the start of compression reaches half of the amount of movement L (see FIG. 5B) that the main punches 11 and 12 move between the start and end of compression. After that, the sub punch 15 reaches the position defining the cavity 14 and stops, and the compression of the raw material powder by the sub punch 15 is finished. Therefore, the compression end by the sub punch 15 may be simultaneous with the end of the compression by the main punches 11 and 12 (when the movement amount of the main punches 11 and 12 reaches the movement amount L) or after that.

  When the green compact is formed in this way, the pin 19 is retracted to be immersed in the lower main punch 12 from the cavity 14, and the die 13 is divided to separate the divided dies 13A and 13B. By separating (retracting) the main punch 11 and the sub-punch 15, the formed green compact is just placed on the lower main punch 12, and is taken out and sintered. Thus, a vertical blade type throw-away tip as shown in FIG. 4, that is, a cutting blade member of a cutting tool can be manufactured.

  Therefore, in such a manufacturing method and press molding die, the raw material powder is compressed by the main punches 11 and 12 and the sub-punch 15 that comes in contact with and separates from the direction in which the main punches 11 and 12 come in contact with each other. Therefore, the raw powder is isotropically compressed in the cavity 14 from multiple directions of the separation / contact direction of the main punches 11 and 12 and the separation / contact direction of the sub punch 15 to press-mold the green compact. be able to. For this reason, since the raw material powder can be uniformly and evenly compressed in the green compact as compared with the case where the raw material powder is compressed simply by a pair of punches facing and separating from each other, the green compact thus press-molded is possible. Sintering does not cause even slight deformation or distortion, and it becomes possible to manufacture a cutting blade member with extremely high accuracy by press molding of a green compact.

  For example, in the present embodiment, when forming the green compact manufactured in the above-described vertical blade type throw-away tip, the surface corresponding to the other peripheral surface 5 of the green compact by the recess 16 of the die 13 Part of the corner ridgeline 8 (in the case of FIG. 3A) or all (in the case of FIG. 3B), or all of the corner ridgeline 8 and part of the flat plate surface 2 (in FIG. 3C) In the case where the recess 16 has a large retraction amount as shown in FIG. 3C, the compression by the upper and lower main punches 11 and 12 is sufficient. It becomes difficult to compress the raw material powder very uniformly in the recess 16. On the other hand, according to the present embodiment, the sub punch 15 approaches the cavity 14 in the direction in which the concave portion 16 extends perpendicular to the contact / separation direction of the main punches 11 and 12 and compresses the raw material powder. Thus, the raw material powder filled in the recess 16 can be sufficiently compressed, and it becomes possible to ensure uniform compression of the raw material powder in the whole green compact. In the throw-away tip in which the green compact is sintered, the portion from the other peripheral surface 5 to the corner ridge line portion 8 can be made to have a desired shape dimension, and accordingly, the cutting blade member of the cutting tool The important part from the cutting edge 6 to the corner part 7 can be formed with extremely high accuracy.

  The same applies to the case where a vertical blade type throwaway tip as shown in FIG. 24 in which the chip breaker 9 is formed on the rake face 3, for example, is manufactured. In this embodiment, such a throwaway tip is manufactured. In order to mold the green compact to be formed, the press surface 15A of the sub punch 15 has a shape corresponding to the chip breaker 9 in the green compact as in the press-molding die of the modification shown in FIGS. Accordingly, the concave portions 15B and the convex portions 15C may be formed so that the concave and convex portions are reversed. Here, FIG. 8A is a cross-sectional view of the tip breaker 9 portion of the vertical blade type throw-away tip manufactured according to this modification, and this tip breaker 9 is attached to the cutting edge 4.6 or the corner portion 7. After retreating gradually toward the inner side of the rake face 3 (right side in FIG. 8A) through the flat surface 2, the other peripheral surface 5, and the land portion 20 having a short width perpendicular to the corner ridgeline portion 8. Further, a flat surface 21 that is perpendicular to the flat plate surface 2, the other peripheral surface 5, and the corner ridge line portion 8 and protrudes from the cutting edges 4, 6 and the corner portion 7 is formed. When the cutting edges 4 and 6 on the periphery of one rake face 3 of the pair of rake faces 3 of the chip body 1 and the corner portion 7 are used for cutting, the flat face 21 of the other rake face 3 is cut. It can be seated against the wall surface of the tool tip mounting seat Uninasa are.

  Accordingly, as shown in FIG. 6, a narrow frame-like flat surface 15 </ b> D perpendicular to the contact / separation direction of the sub punch 15 is formed on the outer peripheral edge of the press surface 15 </ b> A of the sub punch 15. On the inner side, the convex portion 15C gradually rises toward the inner side of the press surface 15A, and the concave portion 15B which recedes in the direction in which the sub punch 15 is separated from the convex portion 15C and becomes concave with respect to the cavity 14. The bottom surface 15E of the recess 15B is a flat surface that is retreated in the direction in which the sub punch 15 is separated from the flat surface 15D. In the vertical blade type throwaway tip manufactured according to this modification, as shown in FIG. 8 (b), the mounting hole 10 gradually decreases in diameter as it goes to the central portion in the thickness direction. In accordance with this, a so-called bell hole structure having a reduced diameter portion 10 </ b> A is formed, and in accordance with this, on the press surfaces 11 </ b> A and 12 </ b> A of the main punches 11 and 12, A substantially cylindrical protrusion 22 is formed in which a reduced diameter portion 22A for forming a portion corresponding to 10A into a through hole of the green compact is formed, and the pin 19 is inserted into the inner diameter portion of these protrusions 22. It is possible to appear and disappear.

  Therefore, even in such a modified example, when the periphery of the surface of the green compact corresponding to the other peripheral surface 5 of the chip body 1 is formed by the recess 16 formed in the die 13 as shown in FIG. The raw material powder filled in the concave portion 16 can be uniformly compressed by the sub punch 15 that is separated from the horizontal direction different from the separation direction of the main punches 11 and 12. Further, in this modified example, even when the above-described concave chip breaker 9 or the convex flat surface 21 is formed on the peripheral surface that becomes the rake surface 3 different from the other peripheral surface 5, By forming the convex portions 15C and the concave portions 15B as described above on the punch 15, the surface corresponding to the chip breaker 9 and the flat surface 21 corresponding to the rake face 3 of the green compact is reliably and uniformly compressed. It can be shaped as follows. In addition, when the chip breaker 9 formed on the rake face 3 is only one that protrudes from the cutting blades 4 and 6 and the corner portion 7, it is only necessary to form a recess on the press surface 15A accordingly. On the contrary, when the chip breaker 9 is only formed in a concave shape on the rake face 3, only the convex portion may be formed on the press surface 15A.

  However, for example, it is conceivable to form such concave portions 15B and convex portions 15C on the die 13 side in the same manner as the concave portion 16, but particularly on the outer peripheral side of the rake face 3 like the vertical blade type throwaway tip. As the flat surface 21 that protrudes from the cutting blades 4 and 6 and the corner portion 7 is formed inside the recessed groove-shaped chip breaker 9 that circulates, it is greatly recessed inside the convex portion 15C that circulates in a frame shape. In the case where the recess 15B is formed, it may be difficult to make the raw material powder surely wrap around the bottom surface of the recess 15B and compress it uniformly with other portions only by compression by the main punches 11 and 12. is there. On the other hand, according to the modification of the present embodiment, since the sub punch 15 is brought into contact with the concave and convex portions 15B and 15C formed on the sub punch 15 in the direction in which the concave and convex portions are uneven, Even in the vicinity of the bottom surface of 15B, it is possible to reliably and uniformly compress the raw material powder to form a green compact. Therefore, it is possible to form the flat surface 21 serving as a reference for seating in the chip body 1 with higher accuracy. Become.

  In the embodiment including this modification, at least a part of the surface corresponding to the flat plate surface 2 having the largest area among the green compacts manufactured in the flat chip body 1 is separated in the vertical direction. Molded by the main punches 11 and 12 in contact with each other, the raw powder is compressed by the main punches 11 and 12 in a direction corresponding to the thickness direction in which the size of the chip body 1 is small, and a green compact is molded. Therefore, the raw material powder can be compressed more uniformly. In particular, even when the through hole that is the mounting hole 10 is formed into a green compact as in the present embodiment, the pin 19 that forms the through hole is in the direction in which the main punches 11 and 12 are separated from each other, that is, the main punch 11. , 12 can be projected into the cavity 14 along the compression direction, so that a uniform raw material powder compression ratio can be obtained also around the pin 19. Moreover, even when a bell hole-shaped through hole is formed by the protrusion 22 as in the modification, in the present embodiment, in addition to the compression by the main punches 11 and 12, the sub punch 15 causes the pin 19 to be perpendicular to the protruding direction. Since the raw material powder is also compressed from any direction, the raw material powder can be surely pushed into the annularly concave portion between the protrusions 22 of the main punches 11 and 12 to achieve uniform compression.

  Further, when the raw powder is compressed together with the main punches 11 and 12 by the sub punch 15 in this way, in the manufacturing method of the present embodiment, the movement amount from when the main punches 11 and 12 start compressing the raw material powder until the compression is finished. After moving closer than 50% of L, compression of the raw material powder by the sub punch 15 is completed, and before the compression by the main punches 11 and 12 is sufficiently performed, the sub punch 15 is inserted into the cavity 14. Is reached and the compression is terminated, so that it is prevented that the main punches 11 and 12 are compressed as if the sub-punch 15 portion becomes a part of the die 13. Thus, the effect of uniformizing the compression of the green compact by the compression of the sub punch 15 can be surely achieved. In addition, it is desirable that the compression of the raw material powder by the sub punch 15 is approximately until the end of the compression by the main punches 11 and 12 in consideration of shortening of the compression process time in the manufacturing method. As described above, it may be after the compression of the raw material powder by the main punches 11 and 12 is completed.

  Furthermore, in the manufacturing method of the present embodiment, after the raw material powder is put between the main punches 11 and 12, the sub punch 15 is once separated from the position defining the cavity 14, and then approaches again. The raw material powder is compressed, so that the charged raw material powder can be sufficiently drawn into the space formed when the sub punch 15 is separated and retracted, and then compressed. It is possible to achieve more uniform compression of the raw material powder. In the present embodiment, the lower main punch 12 is also moved away from (retracted from) the upper main punch 11 at the same time, and the raw powder is drawn into the space above the lower main punch 12. Can be compressed between the main punch 11 and the upper main punch 11, so that the compression can be made uniform even in the direction of separation of the main punches 11 and 12. However, when the amount of movement for compressing the raw material powder by the sub punch 15 is small, the pulling by the lower main punch 12 is completed, for example, without temporarily separating the sub punch 15 as described above. At the time when compression by the main punch 11 is started, the compression may be performed by approaching the cavity 14 as it is, at the same time or after that.

  On the other hand, in the press mold according to the present embodiment, the contact / separation direction of the sub punch 15 is perpendicular to the contact / separation direction of the main punches 11, 12. In contrast to this, since the sub punch 15 is horizontally separated, the driving means for separating the main punches 11 and 12 and the sub punch 15 is designed based on orthogonal coordinates along the separation direction. Therefore, the design can be simplified and a cheaper press mold can be provided, and therefore the manufacturing cost of the cutting blade member (vertical blade type throwaway tip) can be further reduced. Further, in this embodiment, in order to take out the press-molded green compact, the die 13 is also divided into a plurality of divided dies 13A and 13B with the cavity 14 in between, and can be separated and connected. Since the dividing direction of the die 13 is a direction parallel to the separating and contacting direction of the main punches 11 and 12, that is, the vertical direction, the design of the driving means for dividing and separating the die 13 can be simplified. The molded green compact can be easily taken out from the mold while being planned.

  However, in the present embodiment, the die 13 is divided in this way to take out the green compact. For example, as in the embodiment shown in FIGS. 1 and 2, the press surfaces 11A of the main punches 11 and 12 In the case where the protrusion 22 as in the modified example or the concavity or the like is not formed in 12A, the pin 19 is retracted after the compression is completed and the press surface 12A is immersed without dividing the die 13, One of the pair of sub-punches 15 can be separated from the cavity 14 and the other can be pushed out together with the green compact to the side where the one sub-punch 15 is separated. Further, even when the die 13 is divided, in addition to the direction parallel to the direction in which the main punches 11 and 12 are separated from each other as in the above-described embodiment, for example, the direction in which the sub-punch 15 is detached, for example, perpendicular to the direction of separation. The die 13 is divided and separated in a direction parallel to the horizontal direction (left and right direction in FIG. 1) and in a direction perpendicular to both directions of the main and sub punches 11, 12, and 15 (left and right direction in FIG. 2). In some cases, the die 13 may be divided into two or more divided dies and separated from each other in a direction in which a draft is given to the green compact.

  As in the case of dividing the die 13 in this way, at least one of the main punches 11 and 12 and the sub punch 15 may be constituted by a plurality of divided punches as in the die 13. However, in this case, at least one of the main punches 11 and 12 and the sub-punch 15 constituted by a plurality of divided punches is divided by a dividing surface along the direction of separation, and each divided punch is While being slidably contacted with the dividing surface, they are separated from each other independently in the separating direction.

  When the main punches 11 and 12 and the sub-punch 15 are constituted by a plurality of divided punches as described above, the raw material powder filling amount in the separating direction among the surfaces of the green compact formed by the divided punches. Further, it is possible to finely control the compression ratio and obtain a green compact with a more uniform density. For example, in the above embodiment, the pin 19 is located in the center of the sub punch 15 where the pin 19 is projected when viewed from the cavity 14 side in the direction of separation of the sub punch 15. When compression is performed with one sub punch 15, the filling amount of the raw material powder is different compared to the portions on both sides thereof, and the compression ratio also changes. On the other hand, the sub punch 15 is divided at the center portion and both side portions. By independently separating them, it is possible to control the filling amount between the central portion and both side portions so that the compression ratio becomes uniform according to the difference in the filling amount of the raw material powder.

  Furthermore, in the present embodiment, a cross-section 1/4 formed on the surface of the green compact corresponding to the other peripheral surface 5 of the chip body 1 and the intersecting ridge line portion between the other peripheral surface 5 and the flat plate surface 2. As shown in FIGS. 3A to 3C, a part or all of the portion corresponding to the convex arcuate corner ridge line portion 8, or the whole thereof and the edge portion on the corner ridge line portion 8 side of the flat plate surface 2 are shown. It is made to be formed by a recess 16 formed in the die 13. However, in this respect, for example, without providing such a concave portion 16 on the die 13 side, the green compact portion corresponding to all of the corner ridge line portion 8 from the flat plate surface 2 as shown in FIG. 11 and 12, the concave curved surface portion 17 formed at the edge of the press surfaces 11A and 12A of the main punches 11 and 12 and the outer peripheral surface 18 in sliding contact with the die 13 of the main punches 11 and 12 are formed. The crossing angle α may be as close to 0 ° as possible, and the strength of the crossing ridge line portion may be impaired and a defect may occur. However, as described above, a portion corresponding to at least a part of the corner ridgeline portion 8 is die In the present embodiment, the crossing angle α is desirably as large as 45 ° or more, and it is possible to prevent the main punches 11 and 12 from being lost.

  By the way, there is a fear that the main punches 11 and 12 or the sub punches 15 may be lost, and the main punches 11 and 12 and the sub punches 15 that are separated from each other approach each other to define the cavity 14. In this case, the main punches 11 and 12 and the sub punch 15 are both inside the position defining the predetermined cavity 14 due to, for example, a control error of the driving means of the main punches 11 and 12 and the sub punch 15. It can also be caused by too close to interfere or contact each other. Therefore, in order to surely prevent the main punches 11 and 12 and the sub punch 15 from being lost due to such interference and contact, other modified examples of the present embodiment shown in FIG. 9 and other modified examples shown in FIG. In addition, in the press mold, the main punches 11 and 12 and the sub punch 15 are arranged at a distance from each other at the compression end position of the raw material powder in which the cavity 14 is defined. Good. In this case as well, in the manufacturing method of the present embodiment, the surface of the green compact is formed by the die 13 at the portion where the gap is provided.

  Here, in the modification shown in FIG. 9, the press surfaces 11 </ b> A and 12 </ b> A of the main punches 11 and 12 are in contact with and separated from the position of the press surface 15 </ b> A when the sub punch 15 is compressed (see FIG. 9). 9 in the lateral direction in FIG. 9, the auxiliary punch 15 is made smaller in the contact / separation direction than the surface corresponding to the flat plate surface 2 of the chip body 1 formed in the green compact so as to be located inside the cavity 14. Thus, an interval X is provided between the main punches 11 and 12 and the sub punch 15 at the compression end position of the raw material powder. Accordingly, in this case as well, the main punches 11 and 12 are formed only in a part excluding the interval X portion of the surface corresponding to the flat plate surface 2 in the green compact. At least the green compact portion of the flat plate surface 2 corresponding to the portion continuous with the cutting edge 4 is formed by a forming surface 13C on the die 13 side that has a width of the interval X in the direction in which the main punches 11 and 12 are separated from each other. The Rukoto.

  On the contrary, in the modification shown in FIG. 10, the press surface 15 </ b> A of the sub-punch 15, as shown in FIG. 10 (a), On the rake face 3 of the chip body 1 in the green compact so as to be located inside the cavity 14 in the direction of separation of the main punches 11 and 12 (vertical direction in FIGS. 10A to 10C) rather than the position. By making it smaller than the corresponding surface, an interval X is provided between the main punches 11 and 12 and the sub punch 15 at the compression end position of the raw material powder. Therefore, in this case, the sub punch 15 forms only a part of the surface corresponding to the rake face 3 in the green compact, and the surface corresponding to the remaining rake face 3 is in the direction of separation of the sub punch 15. Is formed by the forming surface 13D of the die 13 facing the surface.

  However, in the modification shown in FIG. 10, the press surface 15A is made smaller by an interval X over the entire circumference from the surface corresponding to the rake face 3 as shown in FIG. 10 (b). In this case, the molding surface 13 </ b> D has a substantially window frame shape that circulates with the width of the interval X as seen from the separation / contact direction of the sub punch 15. Further, as shown in FIG. 10C, the press surface 15A may be made smaller by an interval X only at a portion where there is a possibility of contact with the main punches 11 and 12. In this case, the molding surface 13D is formed by the sub punch 15 When the compression of the main punches 11 and 12 is finished, the strips are formed in strips extending along the press surfaces 11A and 12A with the width of the interval X inward from the positions of the press surfaces 11A and 12A when the main punches 11 and 12 are compressed.

  Therefore, according to the modifications of the first embodiment as described above, the main punches 11 and 12 and the sub punch 15 at the compression end position of the raw material powder in the state where the cavity 14 is defined as described above. Since there is a gap X between them, even if a control error or the like occurs in the drive means for the separation and contact, the main punches 11 and 12 and the sub punch 15 are too close to the predetermined compression end position, and the cavity 9, even if the amount of protrusion of the sub punch 15 is equal to or less than the above-mentioned distance X in the modification shown in FIG. 9, the amount of protrusion of the main punches 11 and 12 in the modification shown in FIG. If the distance is equal to or less than the distance X, the main punches 11 and 12 and the sub punch 15 do not come into contact with each other or interfere with each other, and the loss can be prevented.

  In addition, in the modification shown in FIG. 9, the cutting edges 4 and 6 of the chip body 1 in the green compact if the protruding amount of the sub punch 15 is less than the interval X regardless of the protruding amount of the main punches 11 and 12. The ridge line portion corresponding to the corner portion 7 is formed so as to draw a predetermined outline as it is on the outer peripheral edge of the press surface 15A of the sub punch 15, and also in the modified example shown in FIG. In the case of the example shown in FIG. 5, if the compression end position of the main punches 11 and 12 is a predetermined position, the ridge line portions corresponding to the cutting edges 4 and 6 and the corner portion 7 in the green compact are Regardless of the amount of protrusion, it is formed by the side ridge portion of the molding surface 13D that is slightly larger than the press surface 15A formed on the die 13 and the side ridge portion of the main punches 11 and 12 on the secondary punch 15 side of the press surfaces 11A and 12A. . That is, in these modified examples, particularly in the modified example shown in FIG. 9, the portions that become the cutting blades 4 and 6 and the corner portion 7 of the chip body 1 that are important as the cutting blade member of the cutting tool are reliably specified in the green compact. Therefore, it is possible to provide a cutting edge member (throw away tip) that can be used for cutting and can be processed with high accuracy.

  However, if the distance X is too small, contact and interference between the main punches 11 and 12 and the sub punch 15 can be reliably prevented depending on the control error of the driving means of the main and sub punches 11, 12 and 15. There is a risk that it will not be possible. On the other hand, if the distance X is too large, the widths of the molding surfaces 13C and 13D also increase, that is, the portion where the green compact is molded by the die 13 that does not come into contact / separate becomes large. By compressing the raw material powder by the punches 11 and 12 and the sub punch 15, there is a possibility that the effect of achieving uniform compression in the green compact cannot be sufficiently achieved. For this reason, it is desirable that the distance X is set in the range of 0.01 mm to 5 mm.

  9 and FIG. 10 may be combined as appropriate, that is, at least one of the sub punches 15 and one of the main punches 11 and 12 may be applied by applying the modification of FIG. 10 may be applied to the other of the main punches 11 and 12. Further, by combining both of the modified examples of FIGS. 9 and 10, the press surfaces 11A and 12A of the main punches 11 and 12 are closer to and away from the position of the press surface 15A of the sub punch 15 at the end of compression. And is located in the cavity 14 so as to be smaller in the direction of separation of the sub punch 15 than the surface corresponding to the flat plate surface 2 of the green compact, and the press surface 15A of the sub punch 15 is also made of the main punch 11, 12 so that it is located inside the cavity 14 in the direction of separation from the position of the press surfaces 11A, 12A at the end of the compression, and over the entire circumference than the surface corresponding to the rake face 3 in the green compact. It may be partially reduced. In this case, the interval X may be an interval between adjacent edge portions of the press surfaces 11A and 12A of the main punches 11 and 12 and the press surface 15A of the sub punch 15 at the compression end position.

  Furthermore, in the modified example shown in FIG. 10B, as described above, a substantially window frame shape in which the molding surface 13D of the die 13 circulates with the width of the interval X when viewed from the contact / separation direction of the sub punch 15; The surface corresponding to the rake face 3 of the chip body 1 is molded in the green compact by the pressing surface 15A of the sub punch 15 and the molding surface 13D which are close to each other as desired. Yes. Therefore, according to such a modification, for example, as shown in FIG. 24 and FIG. 8A, the rake face 3 of the chip body 1 is recessed via the land portion 20 inside the cutting edges 4 and 6 and the corner portion 7. When manufacturing a vertical blade type throwaway tip having a groove-shaped chip breaker 9 or a flat surface 21 formed thereon, the flat surface formed on the press surface 15A side of the sub punch 15 in the modification shown in FIG. 15D, the flat surface 15D and the convex portion 15C, or in addition to these, a portion to the periphery of the bottom surface 15E of the concave portion 15B may be formed on the molding surface 13D on the die 13 side.

  In such a case, the boundary between the molding surface 13D on the die 13 side and the pressing surface 15A of the sub punch 15 is the boundary between the flat surface 15D and the convex portion 15C, or the protruding end of the convex portion 15C, or It is desirable to set so that it may be located in the periphery of the bottom face 15E of the recessed part 15B. As a result, at the rake face 3 of the chip body 1, the boundary between the land portion 20 and the chip breaker 9, the groove bottom of the groove-shaped chip breaker 9, or the intersection where the chip breaker 9 rises and intersects the flat surface 21. Since the green compact can be press-molded such that the boundary between the molding surface 13D and the pressing surface 15A is located at a portion corresponding to the broken line portion where the rake face 3 bends, such as a ridge line portion, for example, as described above Even if a control error occurs in the driving means of the sub punch 15 and the position of the press surface 15A is displaced, the step formed in the green compact due to the displacement between the press surface 15A and the molding surface 13D is not possible. 1 can be prevented from being formed on the land portion 20, the flat surface 21, or the inclined surface of the chip breaker 9.

  Next, FIG. 11 thru | or FIG. 17 shows 2nd Embodiment of the press-molding die of the green compact used for the manufacturing method of the cutting-blade member of the cutting tool of this invention, and this manufacturing method, In the press-molding mold of the second embodiment, the same reference numerals are assigned to portions common to the press-molding mold of the first embodiment, and description thereof is omitted. In the present embodiment, as in the first embodiment, when manufacturing the rectangular flat plate type vertical blade type throwaway tip shown in FIG. 4, the green compact corresponds to the flat plate surface 2 of the chip body 1. The surface is formed by the main punches 11 and 12, and the surface corresponding to the other peripheral surface 5 is formed by the sub-punch 23 that is separated from the direction in which the main punches 11 and 12 are separated from each other.

  That is, as shown in FIGS. 11 and 12, the main punches 11 and 12 are separated in the vertical direction also in the present embodiment, and the cavity 14 defined between the upper and lower main punches 11 and 12 is formed in the cavity 14. The pair of sub-punches 23 are separated from each other in the horizontal direction on one straight line with their press surfaces 23A facing each other. Then, a surface corresponding to the other peripheral surface 5 of the chip body 1 in the green compact is formed on the press surface 23A of these sub punches 23 in the same manner as formed on the die 13 in the first embodiment. A recess 16 having a bottom surface 16A and a concave curved wall 16B having a cross-sectional arc forming at least a part of a portion corresponding to the corner ridgeline portion 8 is formed. By compressing the raw material powder charged into the cavity 14 together with 11 and 12, the green compact produced in the vertical blade type throwaway tip is press-molded.

  Note that the direction perpendicular to both the direction of separation of the main punches 11 and 12 in the cavity 14 and the direction of separation of the sub-punch 23 (the direction perpendicular to the drawing in FIG. 11 and the left-right direction in FIG. 12). The facing surface is formed on the die 13 and is a flat surface perpendicular to the orthogonal direction, that is, parallel to the contact / separation direction of the main and sub-punches 11, 12, and 23. The corresponding surface is formed as a forming surface 24 on the die 13 side. Accordingly, if at least one of the concave portion retreating with respect to the cavity 14 and the convex portion protruding toward the cavity 14 is formed on the molding surface 24, a chip having a shape in which the concave and convex portions are inverted. Convex and concave portions corresponding to the breaker can be formed on a surface corresponding to the rake surface 3 of the green compact.

  The die 13 is also composed of a plurality of divided dies 13A and 13B which are divided in the vertical direction parallel to the contact / separation direction of the main punches 11 and 12 from the divided surface P shown in FIG. The Of course, the die 13 may be divided in a horizontal direction perpendicular to the direction in which the main punches 11 and 12 are separated from each other, for example, in the horizontal direction in FIG. 11 or in the horizontal direction in FIG. However, when a concave portion or a convex portion is formed on the molding surface 24 on the die 13 side as described above, the die 13 is separated from the main punches 11 and 12 where the concave portion and the convex portion are concave and convex and the sub punch. It is divided in the horizontal direction orthogonal to both of the separation / contact directions of 23. Further, the separation / contact operation of the main punches 11 and 12 and the sub punch 23 in the manufacturing method of the second embodiment when the green compact is press-molded by the press-molding die of this embodiment is shown in FIGS. This may be the same as in the case of the first embodiment shown in (c).

  Accordingly, in the second embodiment as well, the raw powder charged into the cavity 14 is the main punches 11 and 12 and the contact / separation direction of the main punches 11 and 12 as in the first embodiment. Since the green compact is compressed and pressed by the sub-punch 23 separated and contacted in different directions, it is possible to make the compression of the raw material powder uniform in this green compact. By sintering, it becomes possible to manufacture a cutting blade member (vertical blade type throw-away tip) with extremely high accuracy while suppressing slight deformation and distortion. That is, in this embodiment, the concave portion 16 that is recessed with respect to the cavity 14 that molds the portion corresponding to at least a part of the other peripheral surface 5 of the chip body 1 and the corner ridgeline portion 8 into the green compact is the main portion. It is formed on the press surface 23A facing the cavity 14 side of the sub punch 23 that is separated from and contacting the cavity 14 in a direction different from the punches 11 and 12, and the sub punch 23 is formed in the cavity 14 into which the raw material powder is charged. Even when the recess 16 has a large retraction amount, it is compressed together with the main punches 11 and 12 while the raw material powder is sufficiently filled in the recess 16, and the raw powder is uniformly compressed. The body can be shaped.

  By the way, also in the second embodiment in which the concave portion 16 is formed in the sub punch 23 as described above, when the wall surface 16B of the concave portion 16 is formed in a concave curved surface shape having a circular arc as described above, When the intersection angle β formed by the wall surface 16B and the outer peripheral surface 25 of the sub punch 23 that is in sliding contact with the die 13 is too small, for example, the wall surface 16B has a ¼ concave arc shape in cross section and the intersection angle β is infinitely 0 °. In the case of approaching, the strength of the intersecting ridge line portion between the wall surface 16B and the outer peripheral surface 25 is significantly impaired. Then, when the sub punch 23 and the main punches 11 and 12 whose strengths of the intersecting ridge portions are thus damaged are brought into contact or cause interference due to control errors of the respective driving means, the intersecting ridge portions are easily formed. Result in loss.

  Therefore, in order to prevent such a loss of the sub punch 23, as in the case of the first embodiment, the sub punch 23 and the main punches 11 and 12 are, as shown in FIG. ) To (c) as in the modification examples, the compression end positions may be arranged with an interval X therebetween. Here, in the modification shown in FIG. 13 (a), a bottom surface 16A for molding the entire surface corresponding to the other peripheral surface 5 of the chip body 1 in the green compact on the press surface 23A of the sub punch 23, and a corner While the ridgeline portion 8 is formed with a concave arcuate wall surface 16B that forms a surface corresponding to a part of the other peripheral surface 5 side, on the press surfaces 11A and 12A of the main punches 11 and 12, In the same manner as shown in FIG. 3A of the first embodiment, concave curved surface portions 17 having a circular arc cross section are formed on both side edges on the side of the sub punch 23, and the main punches 11 and 12 and the sub punches are formed. 23, when the compression end position is reached, between the intersecting ridge line portion of the wall surface 16 and the outer peripheral surface 25 of the sub punch 23 and the protruding end of the concave curved surface portion 17 of the main punches 11 and 12, as shown in the figure. An interval X is provided. Therefore, in this modification, a portion corresponding to a part of the corner ridge line portion 8 of the chip body 1 in the green compact defines the cavity 14 in the interval X portion, and the molding surface on the die 13 side. Molded by 13E.

  Further, in the modification shown in FIG. 13B, the press surface 23A of the sub punch 23 is a bottom surface 16A that forms the entire surface of the recess 16 corresponding to the other peripheral surface 5 of the chip body 1 in the green compact. Only the press surfaces 11A and 12A of the main punches 11 and 12 are formed on the flat plate surface 2 of the chip body 1 in the green compact as shown in FIG. 3B. Accordingly, only the corresponding surfaces are formed into a flat shape. Therefore, the cross angle α between the press surfaces 11A and 12A of the main punches 11 and 12 and the outer peripheral surface 18 and the press surface 23A and the outer peripheral surface 25 of the sub punch 23 are used. Is 90 °, and the portion of the green compact corresponding to the entire corner ridge portion 8 of the chip body 1 is on the die 13 side in the space X between the main punches 11 and 12 and the sub punch 23. Molding surface 13E It is more molded. Furthermore, in the modification shown in FIG. 13C, the press surfaces 11A, 12A, and 23A of the main and sub punches 11, 12, and 23 are formed between the flat surface 2 of the chip body 1 and the other peripheral surface 5 in the green compact. Of these, it is formed in a flat shape so as to form a portion corresponding to a part excluding the edge on the corner ridge line portion 8 side, and the crossing angles α and β with the outer peripheral surfaces 18 and 25 are also 90 °. In addition, in the green compact, the portions corresponding to the corner ridgeline portion 8 and the edges of the flat plate surface 2 and the other peripheral surface 5 on the corner ridgeline portion 8 side are the distance X between the main punches 11 and 12 and the sub punch 23. Molded by the molding surface 13E of the die 13 facing the part.

  Also in these modified examples, the interval X is desirably in the range of 0.01 mm to 5 mm as in the first embodiment, and the intersection angle β is desirably 45 ° or more. . Further, in the modified examples shown in FIGS. 13A to 13C, the configuration on the main punches 11 and 12 side and the configuration on the sub punch 23 side may be appropriately combined and employed. As shown in FIG. 13A, the press surface 23A of the punch 23 is formed with a bottom surface 16A of the recess 16 and a wall surface 16B having a concave arcuate cross section, while the press surfaces 11A and 12A of the main punches 11 and 12 are shown in FIG. (B) As a flat shape as in (c), a portion corresponding to the corner ridgeline portion 8 in the green compact other than a portion formed by the wall surface 16B or a portion corresponding to an edge portion of the flat plate surface 2 May be formed by the molding surface 13E of the die 13, and conversely, the concave surfaces 17 are formed on the press surfaces 11A and 12A of the main punches 11 and 12 as shown in FIG. The press surface 23A of the punch 23 is 13 (b) and 13 (c) have a flat shape, the portion corresponding to the corner ridgeline portion 8 in the green compact, the portion other than the portion formed by the concave curved surface portion 17, and the other circumference of the green compact You may make it shape | mold the part corresponding to the edge part by the side of the corner ridgeline part 8 of the surface 5 by the molding surface 13E. Furthermore, a different configuration may be adopted between the upper and lower main punches 11 and 12 or between the pair of sub punches 23.

  On the other hand, as another means for preventing the loss of the sub punch 23 and the loss of the main punches 11 and 12 as described above, in the present embodiment, these main punches are modified as shown in the modified examples shown in FIGS. A slidable contact surface that slidably contacts the peripheral surface of the other punch at the compression end position of the raw material powder is formed on one of the punches 11 and 12 and the sub punch 23 so as to extend in the direction of separation of the other punch. You may make it do. Here, the modification shown in FIGS. 14 and 15 is a case where the sub punch 23 is the one punch and the main punches 11 and 12 are the other punch, and the concave surface 16 is formed on the press surface 23A of the sub punch 23. A flat slidable contact surface 26 is formed between the concave portion 16 and the outer peripheral surface 25 of the sub punch 23 that is in slidable contact with the die 13. Has been. 16 and 17, the main punches 11 and 12 are used as one punch and the sub punch 23 is used as the other punch, and the press surfaces 11A and 12A of the main punches 11 and 12 are recessed. At least a part of the curved surface portion 17 is formed, and a planar sliding contact surface 27 extending between the protruding end and the outer peripheral surface 18 in the separating / contacting direction of the sub punch 23 (left and right direction in FIGS. 16 and 17). Is formed.

  In the press-molding dies of these modified examples, before the compression of the raw material powder, the one punch first reaches the compression end position, and then the other punch touches the outer peripheral surface of the one punch. The compression end position is reached while being in sliding contact with the sliding contact surface, and the cavity 14 is defined. That is, when the sub punch 23 is one punch on which the slidable contact surface 26 is formed, the main and sub punches 11, 12, and 23 approach each other from different contact directions as shown in FIG. Then, while compressing the raw material powder, first, as shown in FIG. 14B, the sub punch 23 first reaches the compression end position, and its sliding contact surface 26 slides on the outer peripheral surface 18 of the main punches 11 and 12. Positioning is performed in a state where it is flush with the sliding contact surface 13F of the die 13 in contact therewith. At this time, the main punches 11 and 12 are not approaching beyond the outer peripheral surface 25 of the sub punch 23 in the direction of separation. After the sub punch 23 is positioned in this manner, the main punches 11 and 12 approach while the outer peripheral surface 18 is slidably contacted with the slidable contact surface 26 of the sub punch 23 from the slidable contact surface 13F on the die side. Then, when the press surfaces 11A and 12A are smoothly connected to the wall surface 16B of the recess 16, the compression end position is reached and positioned, whereby the cavity 14 is defined as shown in FIG. Is finished, and the green compact is press-molded.

  Further, in the case of the modified example of FIG. 16 in which one of the punches on which the slidable contact surface 27 is formed is the main punches 11 and 12, as shown in FIG. The main punches 11 and 12 first reach the compression end position and are positioned as shown in FIG. 16B while compressing the raw material powder approaching from different separation directions. 27 is flush with the slidable contact surface 13G on the die 13 side that is in slidable contact with the outer peripheral surface 25 of the sub punch 23. Thereafter, the sub punch 23 approaches the separation / contact direction beyond the position of the outer peripheral surface 18 of the main punch 11, 12, and the press surface 23 A is smooth with the concave curved surface portion 17 of the main punch 11, 12. As shown in FIG. 16 (c), the cavity 14 is defined and the compression of the raw material powder is completed, and the green compact is press-molded.

  In the modification shown in FIG. 14, the position where the slidable contact surface 26 of the sub punch 23 intersects the recess 16 is such that the wall surface 16B of the recess 16 is a chip in the green compact as shown in FIG. The position corresponding to a part of the ¼ arc formed by the cross section of the corner ridge line portion 8 of the main body 1 may be formed, and in this case, the part corresponds to the remaining part of the ¼ arc. The portion to be formed is formed by a concave curved surface portion 17 formed on the press surfaces 11A and 12A of the main punches 11 and 12. Further, as shown in FIG. 15 (b), the wall surface 16B forms a portion corresponding to the entire ¼ arc, or as shown in FIG. 15 (c), the wall surface 16B forms the entire ¼ arc. And a portion corresponding to the edge of the flat plate surface 2 of the chip body 1 on the corner ridge line portion 8 side may be formed. In these cases, the press surfaces of the main punches 11 and 12 may be used. 11A and 12A are formed in a flat shape without the concave curved surface portion 17, and in the case of FIG. 15B, all of the portions corresponding to the flat plate surface 2 in the chip body 1 and in the case of FIG. A portion corresponding to a part of the flat plate surface 2 excluding the edge portion is formed by the press surfaces 11A and 12A in the green compact.

  On the other hand, also in the modification shown in FIG. 16, the position where the slidable contact surface 27 of the main punches 11 and 12 intersects the concave curved surface portion 17 is the position of the chip body 1 in the green compact as shown in FIG. A portion corresponding to a part of a ¼ arc formed by the cross section of the corner ridge line portion 8 may be set to a position where the concave curved surface portion 17 is formed. In this case, the remaining one part of the ¼ arc is formed. A portion corresponding to the portion is formed by a wall surface 16 </ b> B of the recess 16 formed in the sub punch 23. Further, as shown in FIG. 17 (b), the concave curved surface portion 17 forms a portion corresponding to the entire ¼ arc, or as shown in FIG. The portion corresponding to the entire arc and the edge of the other peripheral surface 5 of the chip body 1 on the corner ridge line portion 8 side may be formed. In these cases, the sub punch 23 As shown in FIG. 16, the pressing surface 23A is a flat surface without the concave portion 16 formed. In the case of FIG. 17B, the green compact portion corresponding to the other peripheral surface 5 of the chip body 1 is used. In the case of FIG. 17C, the green compact portion corresponding to a part of the other peripheral surface 5 excluding the edge portion is formed by the press surface 23A.

  Therefore, in these modified examples, although high accuracy is required for controlling the driving means of the main and sub punches 11, 12, 23, the main punches 11, 26 are formed by forming the slidable contact surfaces 26, 27. 12 and the press surfaces 11A, 12A, 23A of the sub punch 23 and the outer peripheral surfaces 18, 25 can be prevented from forming a weak portion having a sharp tip, and defects in such portions can be avoided. Occurrence can be prevented. Moreover, in the modification of the manufacturing method of this embodiment using the press-molding die of these modifications, as shown in FIGS. 14 (a) to (c) and FIGS. 16 (a) to (c). First, before the compression of the raw material powder, the one punch reaches the compression end position and is positioned, and then the other punch approaches the separation and contact direction beyond the position of the outer peripheral surface of the one punch. Since the cavity 14 is defined and the green compact is press-molded by slidably contacting the slidable contact surface of the punch and reaching the compression end position, the slidable contact surface of one punch and the other The raw material powder is not caught between the outer peripheral surfaces of the punches and no clogging occurs. That is, the main punches 11 and 12 protrude from the die 13 toward the cavity 14 before the sub punch 23 is positioned in the modification shown in FIGS. 14 and 15, or the main punches in the modification shown in FIGS. If the auxiliary punch 23 protrudes before the positioning of the auxiliary punch 11 or 12, the raw material powder is clogged between the outer peripheral surfaces 18 and 25 and the sliding contact surfaces 26 and 27. There is a risk that it will not be possible to approach the predetermined compression end position.

  The width W of the slidable contact surfaces 26 and 27 in the separating direction of the other punch (the main punches 11 and 12 in the modification shown in FIGS. 14 and 15 and the sub punch 23 in the modification shown in FIGS. 16 and 17). If this is too small, the outer peripheral surfaces 18 and 25 and the press surface of one of the punches (sub punch 23 in the modification shown in FIGS. 14 and 15 and main punches 11 and 12 in the modification shown in FIGS. 16 and 17). The distance between the concave curved surface portion 17 and the wall surface 16B formed in 11A, 12A, and 23A, that is, the wall thickness around the tip of the intersecting ridge line portion is reduced, so that sufficient strength cannot be ensured and defects or the like can be prevented. There is a risk of disappearing. However, even if the width W is too large, one punch reaches the compression end position and is positioned, and then the other punch comes into sliding contact with the sliding contact surfaces 26 and 27 and reaches the compression end position of the other punch. Since the amount of movement until reaching a large value and the uniform compression effect of the green compact by compressing the raw material powder together with one of the punches may be impaired, the width W of the sliding contact surfaces 26 and 27 is It is desirable that the range is 0.1 mm to 5 mm.

  By the way, in the first embodiment shown in FIGS. 1 to 10, the peripheral surface corresponding to the rake face 3 of the chip body 1 in the green compact manufactured to the vertical flat plate type throw-away chip is formed as a sub punch 15. In the second embodiment shown in FIGS. 11 to 17, the case where the surface corresponding to the other peripheral surface adjacent to the rake face 3 is formed by the sub punch 23 has been described. By combining these, the raw powder is compressed together with the main punches 11 and 12 by a plurality of sub-punches 15 and 23 that are different from the contact and disconnection directions of the main punches 11 and 12 in different directions. It is possible to form the body, which makes it possible to compress the raw material powder isotropically from more directions to form a green compact with more uniform compression. High precision dimensions can be produced indexable i.e. cutting member having a. In this case as well, a part of the green compact may be formed by the die 13, and the main punches 11 and 12 and the auxiliary punches are modified in the modification of the second embodiment shown in FIGS. In the cavity 14 defined by the punch 23, a direction perpendicular to both the separation / contact direction of the main punches 11 and 12 and the separation / contact direction of the sub-punch 23 (direction orthogonal to the drawings of FIGS. 14 to 17). ) From the green compact, the sub-punch 15 for forming the surface corresponding to the rake face 3 is separated so as to be fitted, and all the surfaces of the green compact are connected to the main and sub-punches 11, 12, 15. , 23 press surfaces 11A, 12A, 15A and 23A.

  Finally, FIG. 18 and FIG. 19 show a third embodiment of the press-molding die of the present invention. The press-molding die of this embodiment has a substantially equilateral triangle as shown in FIGS. This is for molding a green compact produced on a vertical blade type throw-away tip used for flat grooving. That is, in this throw-away tip, of the triangular flat plate surface 2 facing the thickness direction of the chip main body 1, one flat plate surface 2 (the upper flat plate surface 2 in FIG. 21) has a central portion 2A of one step. The central portion 2A and the other flat plate surface 2 (the lower flat plate surface 2 in FIG. 21) are formed as a flat surface perpendicular to the thickness direction. In the three corners of the triangle formed by the surface 2, a rake face 3 is formed on one of a pair of peripheral faces intersecting at the corner, and the other peripheral face 5 is a flank face. The cutting edge 6 is an intersecting ridge line with the other peripheral surface 5 which is a flank. The rake face 3 and the other peripheral face 5 as the flank are slightly less than 90 ° with respect to the flat extension Q of the other flat face 2 as shown in FIG. It is formed to have a large inclination angle θ and to incline and extend toward the central portion 2A toward the one flat plate surface 2 side.

  Further, a corner portion 7 having a convex arc shape is formed at both ends of the cutting edge 6, and an intersecting ridge line between the other peripheral surface 5 connected to the corner portion 7 and the corner portions of both flat plate surfaces 2. The section is formed as a convex curved corner ridge line portion 8 formed so that a cross section perpendicular to the direction in which the intersecting ridge line portion extends forms a convex arc or the like smoothly connected to the flat plate surface 2 and the other peripheral surface 5. ing. Further, of the corner portions of the flat plate surface 2 intersecting with the corner ridge line portion 8, the portion on the one flat plate surface 2 side is directed from the corner ridge line portion 8 toward the flat surface side of the central portion of the one flat plate surface 2. Accordingly, the inclined surface 2B is inclined toward the other flat plate surface 2 on the opposite side. Further, the peripheral surface of the chip body 1 other than the corner portion of the triangle, that is, the rake surface 3 formed at one of the corner portions adjacent in the circumferential direction and the other periphery serving as the flank surface formed at the other side. The portion between the plane 5 and the portion on the central portion side of the one flat plate surface 2 is a flat surface 28 along the thickness direction, and the portion on the other flat plate surface 2 side from the flat surface 28 is It is set as the inclined surface 29 which inclines inside the chip | tip main body 1 as it goes to this other flat plate surface 2 side.

  Furthermore, as shown in FIGS. 22A to 22C, the rake face 3 is directed from the cutting edge 6 toward the back side of the rake face 3 (the cutting edge in FIGS. 22A and 22B). 6 toward the upper side) and from the intersecting ridge line portion of the rake face 3 and the two flat plate faces 2 to the inside of the thickness direction of the chip body 1 (left and right direction in FIGS. 22A and 22C), respectively. The cutting edge 6 and the both slab surfaces 2 are formed in a concave shape that gradually recedes with respect to the intersecting ridge line portion, while a substantially square frustum-shaped convex chip breaker 30 is formed in the central portion of the rake face 3. The tip of the chip breaker 30 is formed at a position protruding from the cutting edge 6 and the intersecting ridge line portion. Further, as shown in FIG. 23, the mounting hole 10 of the throw-away tip has a small diameter on the one flat plate surface 2 side (upper side in FIG. 23) and the other flat plate surface 2 side (lower side in FIG. 23). Is formed in a central portion in the thickness direction (vertical direction in FIG. 23) of the chip body 1 and a reduced diameter portion 10A that gradually decreases in diameter from the other flat plate surface 2 side toward the one flat plate surface 2 side is formed. The bell hole shape.

  Therefore, when such a triangular flat plate-shaped throw-away tip is manufactured from a green compact by powder press molding, the green compact also becomes a triangular flat plate shape. In the method and mold in which the green compact is molded by compressing perpendicularly to the direction corresponding to the thickness direction of the main body 1, it becomes increasingly difficult to uniformly compress the raw material powder, and it is practically manufactured. I can't. Therefore, in the press mold of this embodiment, the raw powder is compressed by the main punches 11 and 12 in a direction corresponding to the thickness direction of the chip body 1 and separated in a direction different from the main punches 11 and 12. The raw material powder is also compressed by a plurality of (three in this embodiment) sub-punches 15 in contact with each other, and the chip body in the green compact as in the press mold of the first embodiment shown in FIGS. Each of the surfaces corresponding to the rake surface 3 of 1 is formed.

  Here, in the present embodiment, first, the die 13 is divided from the dividing plane P in the direction parallel to the contact / separation direction of the main punches 11 and 12 that contact / separate in the vertical direction, that is, in the vertical direction. Three sets of divided dies 13A, 13B and circumferentially arranged between these divided dies 13A, 13B are fixed to a cavity 14 defined by main and sub punches 11, 12, 15 respectively. As shown in FIG. 19, the cutting edge of the chip body 1 in the green compact is formed by the concave portion 16 formed in the integrated divided dies 13A and 13B, as shown in FIG. 6, a portion corresponding to the other peripheral surface 5 which is a flank is formed, and a portion corresponding to the flat surface 28 and the inclined surface 29 of the peripheral surface is formed by the split fixing die 13 </ b> H. It is. Since the rake face 3 of the chip body 1 and the other peripheral surface 5 as the flank face have the inclination as described above, the pressure formed with a shape similar to that of the chip body 1 is obtained. In order to give a draft to the powder, the divided surface P of the divided dies 13A and 13B is a direction corresponding to the thickness direction of the chip body 1 in the corner ridgeline portion 8 in the green compact to be molded. As shown in FIG. 19, the die 13 is arranged so that the divided dies 13A and 13B are divided with the most concave portion of the concave portion 16 as a boundary.

  Further, in the present embodiment, the main punches 11 and 12 are also constituted by a plurality of divided punches that are divided by a dividing surface R along the contact / separation direction (vertical direction) of the main punches 11 and 12. That is, the upper main punch 11 includes an inner main punch 11 </ b> C for forming a portion corresponding to the central portion 2 </ b> A perpendicular to the thickness direction of the one flat plate surface 2 of the chip body 1, and the one flat plate surface 2. And the three outer main punches 11D that respectively mold the portions corresponding to the three inclined surfaces 2B on the corner side of the triangle, and the lower main punch 12 also has the other flat plate. An inner main punch 12C for forming a portion corresponding to the portion opposite to the central portion 2A of the surface 2 and three outer main punches 12D for forming a portion corresponding to the portion opposite to the inclined surface 2B. It is configured to be splittable.

  Therefore, the press surface 11A of the upper inner main punch 11C and the lower inner press surface 12A of the outer main punches 12C and 12D are separated from the main punches 11 and 12 corresponding to the thickness direction of the chip body 1. On the other hand, the press surface 11A of the upper outer main punch 11D is an inclined surface toward the cavity 14 side toward the dividing surface R side. Further, the outer main punches 11C and 11D on the upper side and the outer main punches 12C and 12D on the lower side are independent in the separating direction (vertical direction) while being in sliding contact with each other on the dividing surface R. It is possible to connect and disconnect. However, the upper three outer main punches 11D and the lower three outer main punches 12D are brought into and out of contact with each other in synchronization with each other. Further, a protrusion 22 for forming the bell hole-shaped mounting hole 10 as described above of the chip body 1 is formed in the central portion of the press surface 12A of the lower inner main punch 12C, and the circular hole in which the pin 19 protrudes and retracts. It is formed around 12B.

  Then, three sub punches 15 are inserted into the die 13 constituted by the integrated divided dies 13A and 13B and the divided fixed die 13H, and are defined between the main punches 11 and 12. Toward the cavity 14, in this embodiment, as shown in FIG. 18, in a direction substantially perpendicular to each side of the cavity 14 having a substantially triangular shape in plan view, and in a vertical direction in which the main punches 11 and 12 are separated from each other. It is separated from the horizontal direction which is a vertical direction. Therefore, also in this embodiment, when the main punches 11 and 12 and the sub punch 15 approach toward the cavity 14, the raw material powder charged into the cavity 14 is compressed to form a green compact, At this time, portions of the green compact corresponding to the three rake faces 3 in the peripheral surface of the chip body 1 are respectively formed by the three sub punches 15. Further, on each press surface 15A of the sub punch 15, a convex portion 15C protruding toward the cavity 14 corresponding to the concave surface formed by the rake surface 3 of the chip body 1 is formed in a frame shape on the outer peripheral side of the press surface 15A. In addition, a concave portion 15B is formed in the central portion of the press surface 15A so as to recede from the cavity 14 corresponding to the convex chip breaker 30.

  According to the press-molding die of the third embodiment configured as described above and the method of manufacturing the cutting blade member of the cutting tool using the press-molding die, the square shape as in the first and second embodiments. Other than the flat cutting blade member (vertical blade type throw-away tip), the triangular flat plate as described above can also be manufactured from green compact by press molding of raw material powder, and this green compact is the main punch. 11 and 12 and the sub-punch 15 separated from the direction different from the direction of separation, the material powder is formed by isotropically compressing the material powder from multiple directions. It is possible to make uniform, and it is possible to manufacture a cutting blade member having a highly accurate dimensional shape without any slight deformation or distortion during sintering. According to the present invention, not only such a triangular flat plate shape, but a rectangular flat plate-like cutting blade member as in the first and second embodiments, a polygonal flat plate shape or a star shape higher than that. Even if the peripheral surface itself has a shape that is uneven, or a cutting blade member that has a complicated shape other than a flat plate shape, it can be manufactured with high precision from a green compact by press molding without using injection molding etc. It becomes possible.

  Further, as described above, the main punches 11 and 12 are each divided into a plurality of inner main punches 11C and 12C and outer main punches 11D and 12D so that they can be separated from each other independently. In the molding die, even when green compacts manufactured on the chip body 1 having different thicknesses as shown in FIG. 21 are molded at the central portion 2A and the inclined surface 2B of the one flat plate surface 2, the compression starts. By appropriately adjusting the interval between the inner main punches 11C and 12C and the interval between the outer main punches 11D and 12D and controlling the amount of raw material powder to be filled, the raw material powder compression ratio is ensured. It can be made uniform. In the present embodiment, the portion corresponding to the rake face 3 of the green compact is formed by the sub punch 15, but other than the flank of the cutting edge 6 as in the second embodiment. The portion corresponding to the peripheral surface 5 may be formed by the sub punch, and further, the portions corresponding to the rake surface 3 and the other peripheral surface 5 are different from the contact / separation direction of the main punches 11 and 12, and Alternatively, the plurality of sub-punches that are separated from each other in different directions may be formed.

  Further, in the present invention, as described above, by compressing the raw material powder in the green compact by press molding, an extremely accurate cutting blade member can be produced simply by sintering the green compact. However, when it is necessary to improve the accuracy of the cutting edge member, etc., grinding is performed with a grindstone on at least a part of the peripheral surface or flat surface of the tip body of the sintered throw-away tip. It may be applied, or the cutting blade may be subjected to honing.

It is sectional drawing along the separation direction of the main punches 11 and 12 and the separation direction of the subpunch 15 which shows 1st Embodiment of the press molding die of this invention. FIG. 2 is a cross-sectional view perpendicular to the direction of contact of the sub punch 15 along the direction of contact of the main punches 11 and 12 in the embodiment shown in FIG. 1. FIG. 3 is an enlarged view of a portion indicated by a chain line A in FIG. It is a perspective view of the vertical blade type throwaway tip manufactured by the manufacturing method using the press molding die of a 1st embodiment. It is a figure which shows 1st Embodiment of the manufacturing method of this invention in the case of manufacturing a cutting blade member by press-molding green compact with the press molding die of embodiment shown in FIG. FIG. 6 is a cross-sectional view taken along the direction of contact / separation of main punches 11 and 12 and the direction of contact / separation of a sub-punch 15 showing a modification of the press-molding die of the first embodiment. FIG. 7 is a cross-sectional view orthogonal to the contact direction of the sub punch 15 along the contact direction of the main punches 11 and 12 in the modification shown in FIG. 6. 6A is a cross-sectional view orthogonal to the cutting blades 4 and 6 or the corner portion 7, and FIG. 6B is a cross-sectional view of the mounting hole 10. FIG. 6 is a cross-sectional view taken along the direction of contact / separation of main punches 11 and 12 and the direction of contact / separation of a sub-punch 15 showing another modification of the press-molding die of the first embodiment. The modification of the press molding die of a 1st embodiment is shown, (a) is a sectional view which followed the separation direction of main punches 11 and 12 and the separation direction of sub punch 15, (b) is (a) ) Is an example of a ZZ cross-sectional view in (), and (c) is another example of the ZZ cross-sectional view in (a). It is sectional drawing along the separation / contact direction of the main punches 11 and 12 and the separation / contact direction of the subpunch 23 which show 2nd Embodiment of the press molding die of this invention. FIG. 12 is a cross-sectional view orthogonal to the direction of contact of the sub-punch 23 along the direction of contact of the main punches 11 and 12 in the embodiment shown in FIG. 11. It is an enlarged view which shows the example of the dashed-dotted line B part in FIG. 2nd execution of the manufacturing method of this invention in the case of manufacturing a cutting blade member by press-molding green compact with the press-molding die of this modification, and the press-molding die of 2nd Embodiment It is sectional drawing along the separation / contact direction of the main punches 11 and 12, and the separation / contact direction of the subpunch 23 which show the modification of a form. It is an enlarged view which shows the example of the chain line C part in FIG.14 (c). Another modification of the press-molding mold of the second embodiment, and the manufacturing method of the present invention in the case of manufacturing a cutting blade member by press-molding a green compact with a press-molding mold of another modification FIG. 9 is a cross-sectional view taken along the direction of separation of the main punches 11 and 12 and the direction of separation of the sub-punch 23, showing another modification of the second embodiment. It is an enlarged view which shows the example of the dashed-dotted line D part in FIG.16 (c). It is a cross-sectional view (ZZ cross-sectional view in FIG. 19) showing a third embodiment of the press-molding die of the present invention. It is ZZ sectional drawing in FIG. It is a top view of the vertical blade type throw away tip manufactured by the manufacturing method using the press molding die of a 3rd embodiment. It is a side view of the arrow line Y direction view in FIG. 20A is an enlarged side view of the rake face 3, FIG. 20B is an enlarged plan view of a peripheral portion of the cutting edge 6, and FIG. 20C is a cutting edge viewed from the other peripheral face 5 side. FIG. 6 is another enlarged side view of the peripheral portion. It is an expanded sectional view of the attachment hole 10 of the vertical blade type | formula throwaway tip shown in FIG. It is a perspective view showing a rectangular flat plate type vertical blade type throwaway tip with a tip breaker 9.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tip body 2 Flat surface 3 Rake face 4,6 Cutting edge 5 Other peripheral surface of the chip body 1 7 Corner part 8 Corner ridge part 9, 30 Chip breaker 10 Mounting hole 11, 12 Main punch 11A, 12A Main punch 11, 12 press faces 11C, 12C Main punch (split punch)
11D, 12D outer main punch (split punch)
13 Die 13A, 13B Split Die 13C, 13D, 13E, 24 Die 13 Molding Surface 14 Cavity 15, 23 Sub Punch 15A, 23A Press Surface of Sub Punch 15, 23 15B, 16 Concave 15C Convex 19 Pin 26 Sub Punch 23 Sliding contact surface 27 Sliding contact surface of main punches 11 and 12 L Amount of movement that main punches 11 and 12 approach from the start of compression of raw material powder to the end of compression X Main punch 11 at the end point of compression of raw material powder , 12 and the sub-punches 15 and 23 are spaced apart. W The width of the sliding contact surfaces 26 and 27.

Claims (18)

Using this press-molding die comprising a press-molding die comprising a plurality of main punches that are opposed to each other and relatively separated from each other and a die that is disposed so as to surround the adjacent main punches A method for manufacturing a cutting tool member for a cutting tool, in which a green compact manufactured on a cutting tool member of a cutting tool is press-molded by compressing the raw material powder charged into the cutting tool, wherein the main punch is separated from the die. A secondary punch that is separated from the cavity of the press mold from a direction different from the contact direction is provided, and compression of the raw material powder by the approach of the secondary punch toward the cavity, and the main punch A method for producing a cutting blade member of a cutting tool, wherein the green compact is press-molded by compression of the raw material powder by approaching each other.   The cutting blade member has a chip body having a substantially flat plate shape, and includes a flat plate surface facing the thickness direction of the chip main body and a peripheral surface arranged around the flat plate surface, and formed on the peripheral surface A throw-away tip having a cutting edge formed on at least one of an intersecting ridge line between the rake face and the flat plate surface, and an intersecting ridge line between the other peripheral surface adjacent to the rake face and the rake face, The main punch is separated in a direction corresponding to the thickness direction to form at least a part of a surface of the green compact corresponding to the flat plate surface of the chip body, and the sub punch includes the pressure The method for manufacturing a cutting blade member of a cutting tool according to claim 1, wherein at least a part of a surface of the powder corresponding to the peripheral surface of the chip body is formed.   The cutting blade of a cutting tool according to claim 2, wherein at least a part of a surface corresponding to a peripheral surface of the chip body on which the rake face is formed in the green compact is formed by the sub punch. Manufacturing method of member.   The cutting blade member of a cutting tool according to claim 2 or 3, wherein at least a part of a surface of the green compact corresponding to the other peripheral surface of the chip body is formed by the sub punch. Manufacturing method.   The at least one of the main punch and the sub-punch forms only a part of the surface of the green compact on which the punch is formed, and the remaining part is formed by the die. The manufacturing method of the cutting-blade member of the cutting tool of Claim 4.   The sub-punch finishes the compression of the raw material powder after approaching 50% or more of the amount of movement approached from the time when the main punch starts to compress the raw material powder to the end of compression. The manufacturing method of the cutting-blade member of the cutting tool in any one of Claims 1 thru | or 5.   The sub-punch compresses the raw material powder after being separated from the cavity and then approached after the raw material powder is charged between the main punches. The manufacturing method of the cutting-blade member of the cutting tool in any one of claim | item 6. A press molding die of a green compact used in the method for manufacturing a cutting blade member of a cutting tool according to any one of claims 1 to 7, wherein the plurality of press molds are opposed to each other and relatively separated from each other. a main punch and a die which is disposed so as to surround the periphery of the main punch in close proximity, provided the die is different from the disjunction direction of the main punch against the cavity of the press-molding die A green compact press-molding die, comprising: a sub-punch that is separated from the direction and compresses the raw material powder charged into the press-molding die together with the main punch.   9. The green compact press-molding die according to claim 8, wherein the main punch is provided with a pin capable of protruding and retracting in the cavity in a direction in which the main punch is separated.   10. The at least one of the concave portion retreating with respect to the cavity and the convex portion projecting toward the cavity are formed in the sub punch. Green compact press mold.   The green compact press-molding metal according to any one of claims 8 to 10, wherein the main punch and the sub-punch are arranged at a distance from each other at a compression end position of the raw material powder. Type.   12. The green compact press-molding die according to claim 11, wherein the interval is in a range of 0.01 mm to 5 mm.   One of the main punch and the sub punch has a slidable contact surface in sliding contact with the other punch at the compression end position of the raw material powder so as to extend in the direction of separation of the other punch. The green compact press-molding die according to any one of claims 8 to 10.   The green compact press-molding die according to claim 13, wherein the width of the sliding contact surface in the direction of separation of the other punch is in the range of 0.1 mm to 5 mm.   15. The green compact press-molding die according to claim 8, wherein the sub-punch is brought into and out of contact with a direction perpendicular to the direction of coming and going of the main punch.   The green compact press according to any one of claims 8 to 15, wherein the die is divided with the cavity in between, and at least a part of the die is separable. Molding mold.   The at least part of the divided dies can be separated / attached in a direction parallel to a separation / contact direction of the main punch or a direction perpendicular to the separation / contact direction of the main punch. A press-molding die of the green compact according to 16. 18. The green compact press-molding die according to claim 8, wherein at least one of the main punch and the sub punch is constituted by a plurality of divided punches.

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