JP2012035341A - Cutting edge exchange type tip and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting edge exchange type tip and a method for manufacturing the cutting edge exchange type tip, allowing improvement of positional accuracy when mounted on a holding tool.SOLUTION: This cutting edge exchange type tip includes a rake face including a corner 11 of an acute angle and a vertex 12 of an obtuse angle, and a flank continuous to a side 13 held between the corner 11 and the vertex 12 on an outer periphery of the rake face and extending in a direction crossing the rake face. The side 13 to be a line of intersection between the rake face and the flank is a cutting edge. The flank is formed into a projecting surface shape and includes a first region located on the vertex 12 side and a second region located on the corner 11 side. When a distance from an intersection between an extension of a part continuous to the first region of the cutting edge and a line segment extending in a direction perpendicular to the extension from an end point on the corner 11 side of the cutting edge up to an end point on the vertex 12 side of the cutting edge is a and a distance from an end point on the intersection side in the part continuous to the first region of the cutting edge up to the intersection is b, 0.20≤b/a≤0.70 is satisfied.

Description

  The present invention relates to a blade-tip-exchangeable tip and a method for manufacturing the same, and more particularly, to a blade-tip-exchangeable tip having a flank surface composed of a plurality of surfaces and a method for manufacturing the same.

  A blade-tip-exchangeable tip used for cutting is manufactured by compacting and sintering a cemented carbide as disclosed in, for example, Japanese Patent Laid-Open No. 61-288903 (Patent Document 1). . In the case of an unground chip, there is a problem in that a density difference occurs between the upper surface side and the lower surface side during compacting, warping due to this density difference occurs during sintering, and this warping remains as it is. With respect to this problem, in Patent Document 1, a flat portion protruding in the thickness direction of the chip is formed at a corner portion of at least one of the both end surfaces of the chip, and a portion following the flat portion in a direction away from the corner blade is formed. An unground negative slobe tip having an inclined surface having a downward slope is disclosed.

  Further, as another blade tip replaceable tip, for example, in JP-A-2005-324324 (Patent Document 2), a cutting edge or a main cutting edge is formed straight along the entire width of the tip, and the main cutting edge and the surface are formed. A turning insert is disclosed in which the boundary with the cutting edge that finishes is a bending point.

  The user's procedure for using such a blade tip replaceable tip is, for example, as follows. First, a tip is attached to the holder with a specific corner used for cutting facing the tip side of the holder, and fine adjustment is performed to set the tip position of the blade edge to a specified position. At this time, since the size and the amount of deformation are different for each tip, and the tip position of the blade tip is different in units of μm for each corner of the same tip, the tip of the blade tip is set to the same designated position as the corner used for the previous cutting. The position needs to be adjusted again. This blade edge position adjustment amount becomes larger with a tip having a large dimensional tolerance (generally a side flank non-polished tip) or a tip having a large deformation amount. Cutting is performed with the blade-tip-exchangeable tip thus attached. After the tip has been used for cutting until the tip corner life, the tip is removed from the holder. Then, another corner of the same chip or another corner of another chip is attached, and then the fine cutting is performed again to make the cutting edge tip position a designated position, and then cutting is performed.

Japanese Patent Laid-Open No. 61-288903 JP 2005-324324 A

  However, in the blade-tip-exchangeable tips of Patent Documents 1 and 2, a difference occurs in the shape of another corner of the same tip attached to the holder or another corner of another tip. As a result of intensive studies, the present inventor found that the above-mentioned has not been sufficiently reduced.

  In addition, a technique for processing to reduce the difference in the shape of another corner of the same chip attached to the holder or another corner of another chip can be considered, but in processing to obtain a chip with extremely high dimensional accuracy, The sintered compact needs to be polished with a diamond grindstone. However, such a polishing process increases the manufacturing cost. In addition, it is often impossible to polish a portion having a complicated three-dimensional shape. For this reason, it is difficult to realize a chip in which the deviation of the tip position of the blade edge each time the blade edge is replaced.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a blade-tip-exchangeable tip and a method for manufacturing the same, which can improve the positional accuracy when attached to a holder.

  The cutting edge-replaceable tip according to the present invention has a rectangular outer periphery, and is sandwiched between a rake face including an acute corner and an obtuse apex located on the outer periphery, and a corner and apex on the outer periphery of the rake face. A flank extending in the direction intersecting with the rake face and extending along the side is provided. The edge that is the intersection of the rake face and the flank face is the cutting edge. The flank is convex, and includes a first region located on the apex side and a second region located on the corner side that is continuous with the first region. The distance from the intersection of the extension line of the cutting blade connected to the first region and the line segment extending in the direction perpendicular to the extension line from the corner end side of the cutting edge to the end point on the vertex side of the cutting edge is a When the distance from the end point on the intersection side to the intersection in the portion of the cutting edge that is continuous with the first region is b, the condition of 0.20 ≦ b / a ≦ 0.70 is satisfied.

  The method for manufacturing a blade-tip-exchangeable tip according to the present invention includes a step of preparing a raw material, a step of forming a green compact by filling the raw material into a mold and compressing the raw material, and heating the green compact. And obtaining a sintered body. The sintered body has a rectangular shape on the outer periphery, a rake face including an acute corner and an obtuse apex located on the outer periphery, and a side sandwiched between the corner and the apex on the outer periphery of the rake face, A first region having a flank extending in a direction intersecting with the rake face, a side that is an intersection of the rake face and the flank is a cutting edge, the flank face is convex, and is located on the apex side And a second region that is continuous with the first region and located on the corner side, and is an extension line of a portion of the cutting edge that is continuous with the first region, and perpendicular to the extension line from the corner side end point of the cutting edge. When the distance from the intersection with the line segment extending in a certain direction to the end point on the apex side of the cutting edge is a, and the distance from the end point on the intersection side in the portion of the cutting edge connected to the first region to the intersection is b , 0.20 ≦ b / a ≦ 0.70 is satisfied.

  As a result of earnest research, the present inventor has found that the density of the powder supplied to the mold of the raw material powder is higher in the vicinity of the apex of the obtuse angle than in the vicinity of the corner of the acute angle. I found out. For this reason, when attaching a chip | tip to a holder, the deterioration of the blade-tip position accuracy resulting from a deformation | transformation of a sintered compact can be suppressed by supporting a chip | tip in the vertex vicinity of an obtuse angle. Thus, when attaching a blade edge | tip exchange-type chip | tip to a holder, the area hold | maintained in the corner of an acute angle with a large distortion will become too large that it is 0.20> b / a. For this reason, it is not possible to improve the position accuracy when attaching to the holder due to distortion in the vicinity of an acute corner. Similarly, when attaching the blade-tip-exchangeable tip to the holder, if b / a> 0.70, the area that can be attached to the holder is too small. For this reason, due to the deterioration of stability, it is not possible to improve the positional accuracy when attaching to the holder. That is, by satisfying the condition of 0.20 ≦ b / a ≦ 0.70, it is possible to improve the position accuracy when attaching to the holder.

  In the above-mentioned blade-tip-exchangeable tip, preferably, the condition of 5 μm ≦ d ≦ 100 μm is satisfied, where d is the distance between the extension line and the corner-side end point of the cutting blade.

  By satisfying the condition of 5 μm ≦ d, the possibility that the corner and the holder come into contact with each other can be further reduced, so that deterioration of the edge position accuracy due to such contact can be further suppressed. By setting d ≦ 100 μm, the chip disposability is well maintained, so that deterioration of the surface roughness of the processed surface can be suppressed.

  In the above-described blade-tip-exchangeable tip, the corner may be a round corner, and the radius of curvature of the corner may be 2.4 mm or less.

  In this case, even if the corner is a round corner, the corner portion as a whole is an acute corner, and the raw material powder filled in the acute corner is filled more than the raw material powder filled in the portion where the apex of the obtuse angle is located. Density tends to be low. However, even if the radius of curvature is 2.4 mm or less, the present invention can reduce the influence of distortion in the vicinity of an acute corner. For this reason, even if it has a round corner with a curvature radius of 2.4 mm or less, it is possible to improve the positional accuracy of attaching to the holder. In particular, the effect of the present invention is remarkable at 1.6 mm or less.

  In the blade edge replaceable tip, the second region may be curved. Even if it is such a shape, the blade edge | tip exchange-type chip | tip of this invention can improve the positional accuracy at the time of attaching to a holder.

  In the blade edge replaceable tip, the second region may be planar. Thereby, the processing of the second region is easier than when the second region is a curved surface.

  In the blade tip type insert, the acute corner may have an angle of 80 ° or less. The density of the raw material powder filled in the corners of 80 ° or less is likely to be lower than the raw material powder filled in the portion where the apex of the obtuse angle is located. However, even with such a shape, the present invention can reduce the influence of distortion near an acute corner. For this reason, even if an acute corner is 80 degrees or less, the positional accuracy at the time of attaching to a holder can be improved.

  The blade-tip-exchangeable tip further includes another flank formed at a position facing the flank, and the flank and the other flank extend perpendicular to the rake face and the rake. You may have the shape used as the rotational symmetry centering on the rotating shaft which passes the center of a surface.

  Thereby, also about the corner formed in the edge part of another flank, the deterioration of a blade edge position precision can be suppressed similarly to the corner located in the edge part of the said flank.

  In the blade-tip replaceable tip, the base material constituting the blade-tip replaceable tip is WC-based cemented carbide, cermet, high speed steel, ceramics, cubic boron nitride sintered body, diamond sintered body, silicon nitride sintered body It may be at least one selected from the group consisting of a bonded body, aluminum oxide, and titanium carbide.

  The present invention is particularly effective for a blade-tip-exchangeable tip produced from these substrates by a sintering method.

  In the blade tip replaceable tip, the flank may be a non-polished surface. Thereby, since a polishing process can be eliminated in the manufacture of the chip, the productivity and economy of the chip can be improved. In addition, the degree of freedom in designing the chip shape can be increased.

  In the cutting edge replaceable tip, the rake face is perpendicular to the non-grinding surface of the work piece to be ground by the cutting edge replaceable chip in a state where the cutting edge replaceable chip is attached to a holder, Further, it may have a negative shape formed so as to be inclined toward the traveling direction side from a vertical plane perpendicular to the traveling direction of the holder.

  Even if it is a negative type shape, the blade-tip-exchangeable tip of the present invention can improve the positional accuracy when attached to the holder.

  In the blade tip replaceable tip, an opening may be provided on the rake face. Thereby, a lever lock type can be adopted as a method of holding the chip on the holder.

  In the blade tip replaceable tip, the flank may be a surface that is not ground. Thereby, since a grinding process can be eliminated in the manufacture of the chip, it is possible to improve the productivity and economy of the chip. In addition, the degree of freedom in designing the chip shape can be increased.

  As is apparent from the above description, according to the blade tip replaceable tip and the blade tip replaceable tip manufacturing method of the present invention, the blade tip replaceable tip that satisfies the condition of 0.20 ≦ b / a ≦ 0.70 is strained. Position accuracy can be improved by attaching to the holder near the apex of a small obtuse angle.

It is a schematic diagram which shows the structure of the blade edge | tip-exchange-type chip | tip in embodiment of this invention. It is an expansion schematic diagram of the corner vicinity of the blade edge | tip-exchange-type chip | tip in embodiment of this invention. It is an expansion schematic diagram of the corner vicinity of the blade edge | tip-exchange-type chip | tip in embodiment of this invention. It is an expansion schematic diagram of the cutting-blade vicinity of the blade-tip-exchange-type chip | tip in embodiment of this invention. It is an expansion schematic diagram of the cutting-blade vicinity of the blade-tip-exchange-type chip | tip in embodiment of this invention. It is an expansion schematic diagram of the cutting-blade vicinity of the blade-tip-exchange-type chip | tip in embodiment of this invention. It is an expansion schematic diagram of the cutting-blade vicinity of the blade-tip-exchange-type chip | tip in embodiment of this invention. It is a schematic diagram which shows the state which attached the blade-tip-exchange-type chip | tip in embodiment of this invention to the holder. FIG. 3 is a schematic diagram illustrating a method for measuring a blade-tip-exchangeable tip in Example 1. 6 is a schematic diagram showing a measuring method of a blade edge replaceable tip in Example 2. FIG. 6 is a schematic view showing a blade-tip-exchangeable tip of Comparative Example 1. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

  With reference to FIGS. 1-7, the structure of the blade-tip-exchange-type chip | tip in one embodiment of this invention is demonstrated. The blade-tip replaceable tip 1 in the present embodiment includes a rake face 10, a flank face 20, and another flank face 30. The rake face 10 includes an acute corner 11 and an obtuse vertex 12 located on the outer periphery. The flank 20 is continuous with the side 13 sandwiched between the corner 11 and the apex 12 on the outer periphery of the rake face 10 and extends in a direction intersecting the rake face 10 (a direction orthogonal in the present embodiment). The other flank 30 is formed at a position facing the flank 20. The flank 20 and the other flank 30 have shapes that are perpendicular to the rake face 10 and are rotationally symmetric about a rotation axis that passes through the center of the rake face 10.

  The outer periphery of the rake face 10 is rectangular. Here, the rectangular shape means a substantially rectangular shape, for example, a shape having four angles within a range of 30 ° to 150 °. That is, the angle θ1 of the corner 11 is, for example, 30 ° or more and less than 90 °, and the angle θ2 of the vertex 12 is, for example, more than 90 ° and less than 150 °. The angle θ1 of the corner 11 is preferably 80 ° or less.

  The corner 11 and the vertex 12 may be round corners as shown in FIG. 1, or may be corners formed by intersecting the straight side 13 and the side 13a as shown in FIG. Corners may be used as shown in FIG. A round corner means that a curve is formed between the side 13 a forming the corner 11 and the side 13. The round corner is formed by, for example, R-surface processing. A corner corner means that a straight line is formed between the side 13 a forming the corner 11 and the side 13.

  The angle θ1 of the corner 11 means an angle at which the side 13 and the side 13a are extended and intersected. Similarly, the angle θ2 of the vertex 12 means an angle at which the side 13b (see FIG. 1) constituting the outer periphery of the rake face 10 and the side 13 are extended and intersected.

  When the corner 11 is a round corner, the radius of curvature of the corner is preferably 2.4 mm or less.

  The same applies to corners and vertices (on the other flank 30 side) facing the corners 11 and vertices 12 on the rake face 10.

  The rake face 10 is provided with an opening 14. In the present embodiment, the opening 14 is formed substantially at the center of the rake face 10 and penetrates to the face facing the rake face 10 (in the thickness direction). The opening 14 is provided for attaching the blade tip replaceable tip 1 to a lever lock type holding tool.

  A side 13 that is a line of intersection between the rake face 10 and the flank 20 is a cutting edge. All of the sides 13 may be cutting edges, and at least one of the corner 11 and the apex 12 may not be cutting edges.

  The flank 20 is convex, and includes a first region 21 located on the apex 12 side and a second region 22 connected to the first region 21 and located on the corner 11 side. The first region 21 is a region located in a portion extending linearly from the apex 12 side on the side 13. The second region 22 is a region located in a portion extending from the first point (first inflection point 15) inflected from the portion extending linearly from the vertex 12 side on the side 13 to the corner 11 side. That is, the boundary between the first region 21 and the second region 22 is a position where the portion that extends linearly from the apex 12 side toward the corner 11 side on the side 13 (the first inflection point). 15).

  The second region 22 may be planar as shown in FIG. 4 or may be curved as shown in FIG. Further, as shown in FIG. 6, a second inflection point 18 may be provided in the middle of the second region 22. That is, in FIG. 6, the second inflection point 18 is provided between the first inflection point 15, which is the boundary between the first region 21 and the second region 22, and the corner 11. The inclination extending from the first inflection point 15 to the second inflection point 18 on the side 13 is different from the inclination extending from the second inflection point 18 to the corner 11. In FIG. 6, the second region 22 includes a plane extending from the first inflection point 15 to the second inflection point 18 and a plane extending from the second inflection point 18 to the corner 11. Two or more planes may be included. Further, as shown in FIG. 7, a first curved surface extending from the first inflection point 15 to the second inflection point 18 and a second curved surface extending from the second inflection point 18 to the corner 11 are provided. In addition, the curvature radii of the first and second curved surfaces may be different.

  Further, the flank 20 having the first and second regions 21 and 22 may be a non-polished surface or a surface that is not ground.

  Here, with reference to FIG. 4, the parameters of the cutting edge of the blade-tip-exchangeable tip 1 according to the embodiment of the present invention will be described. In the present embodiment, the cutting edge is a region excluding the round corner (arc-shaped portion) of the corner 11 and the round vertex (arc-shaped portion) of the vertex 12 on the side 13.

  Cutting is performed from an intersection 43 between an extension line 41 of a portion of the cutting edge continuous with the first region 21 (see FIG. 1) and a line segment 42 extending in a direction perpendicular to the extension line 41 from the corner end point 16 of the cutting edge. The distance to the apex-side end point 17 of the blade is a. Further, the distance from the end point on the intersection 43 side (first inflection point 15) to the intersection 43 in the portion of the cutting edge that is continuous with the first region 21 is defined as b. In other words, the distance from the end point (first inflection point 15) on the vertex 12 side in the second region 22 to the intersection 43 is b. In such a case, the blade-tip-exchangeable tip satisfies the condition of 0.20 ≦ b / a ≦ 0.70, preferably satisfies the condition of 0.35 ≦ b / a ≦ 0.58. More preferably, the condition of 45 ≦ b / a ≦ 0.55 is satisfied.

  When the distance between the extension line 41 and the corner end point 16 of the cutting edge is d, the condition of 5 μm ≦ d ≦ 100 μm is preferable, and the condition of 40 μm ≦ d ≦ 80 μm is more preferable.

  Although the base material which comprises the blade-tip-exchange-type chip | tip 1 is not specifically limited, WC group cemented carbide, cermet, high speed steel, ceramics, cubic boron nitride sintered body, diamond sintered body, silicon nitride sintered body, It is preferably at least one selected from the group consisting of aluminum oxide and titanium carbide. A surface coating layer may be formed on the surface of the substrate.

  The cemented carbide includes, for example, tungsten carbide and a binder phase composed of one or more types of iron-based metals, the balance being inevitable impurities, tungsten carbide, and one or more types of iron-based metals. Of the periodic table IVa, Va, IVa group transition metal having a B-1 type crystal structure and a solid solution phase composed of carbon, nitrogen, oxygen or boron, with the balance being an inevitable impurity. It is done. In these cases, the binder phase is, for example, 0.1 to 30% by weight, and the solid solution phase is, for example, 0.01 to 50% by weight. The surface portion of the cemented carbide may have a η phase or free carbon, and may or may not have a layer mainly composed of an iron-based metal or a de-β layer.

  The cermet includes, for example, a binder phase composed of one or more of iron-based metals, a periodic table IVa, Va, IVa group transition metal (mainly titanium) having a B-1 type crystal structure, and carbon, nitrogen, oxygen, or And a solid solution phase composed of boron, with the balance being inevitable impurities. In this case, the binder phase is, for example, 0.1 to 40% by weight, and the solid solution phase is, for example, 0.1 to 95% by weight. There may be a surface hardened layer, a softened layer, or a layer mainly composed of iron-based metal on the surface portion of the cermet.

  In addition, the rake face 10 is perpendicular to the non-ground surface of the workpiece to be ground by the blade tip replaceable tip 1 in a state in which the blade tip replaceable tip 1 is attached to the holder, and the holder progresses. It may be a negative shape formed so as to be inclined toward the traveling direction side with respect to a vertical plane perpendicular to the direction.

  Then, the manufacturing method of the blade-tip-exchangeable chip 1 in the present embodiment will be described. First, prepare raw materials. The raw material is not particularly limited, but for example, a group consisting of WC-based cemented carbide, cermet, high speed steel, ceramics, cubic boron nitride sintered body, diamond sintered body, silicon nitride sintered body, aluminum oxide and titanium carbide At least one powder selected from.

  Next, a green compact is formed by filling the raw material into a mold and compressing the raw material. In the present embodiment, after the raw material powder is mixed and pulverized, the raw material powder is supplied to a mold on which the convex flank 20 shown in FIG. 1 is formed, and compression molding is performed in that state.

  Next, the green compact is heated to obtain a sintered body. The method for obtaining the sintered body is not particularly limited, but for example, liquid phase sintering is adopted.

  Next, cutting edge processing is performed using a brush, barrel, blast, diamond grindstone, laser processing, or the like. Further, polishing may be performed on the rake face 10 or the like. Note that these steps may be omitted.

  Further, even if a surface coating layer is formed on these substrates by a known CVD method, PVD method, sputtering method or a combination thereof, the effect of the present invention is not lost, and after forming the coating layer, a brush, barrel, blast The effect of the present invention is not lost even if a coating layer surface treatment such as partial removal of the coating layer by a diamond grindstone or laser processing or a surface smoothing process is performed.

  Through the above steps, as shown in FIGS. 1 to 7, the outer peripheral shape is rectangular, the rake face 10 including the acute corner 11 and the obtuse apex 12 located on the outer periphery, and the outer periphery of the rake face 10. And a flank face 20 extending in a direction intersecting with the rake face 10, the edge 13 being an intersection line of the rake face 10 and the flank face 20 is a cutting edge. The flank 20 is convex and includes a first region 21 located on the apex 12 side and a second region 22 connected to the first region 21 and located on the corner 11 side. From the intersection 43 of the extension line 41 of the blade connected to the first region 21 and the line segment 42 extending in the direction perpendicular to the extension line 41 from the corner-side end point 16 of the cutting edge to the vertex-side end point 17 of the cutting edge And the first of the cutting edges A sintered body that satisfies the condition of 0.20 ≦ b / a ≦ 0.70, where b is the distance from the first inflection point 15, which is the end point on the intersection point side, in the portion connected to the region 21. Obtainable.

  Then, with reference to FIG. 8, the usage method of the blade-tip-exchange-type chip | tip 1 in one embodiment of this invention is demonstrated. In the present embodiment, the blade tip replaceable tip 1 is attached to a holder 50 such as a cutting tool.

  First, the blade tip replaceable tip 1 is attached to the holder 50 so that the specific corner 11 used for cutting faces the open side of the holder 50, and fine adjustment is performed to make the tip position of the blade tip a designated position. At this time, since the size and the amount of deformation are different for each tip, and the tip position of the blade tip is different in units of μm for each corner of the same tip, the tip of the blade tip is set to the same designated position as the corner used for the previous cutting. Adjust the position. Note that this blade edge position adjustment amount becomes larger with a tip having a large dimensional tolerance (generally a side flank non-polished tip) or a tip having a large deformation amount. Cutting is performed by the blade-tip-exchangeable tip 1 attached in this way.

  After the tip 1 is used for cutting until the life of the corner 11 of the tip 1, the tip 1 is removed from the holder 50. Then, another corner of the same chip or another corner of another chip is attached, and then the fine cutting is performed again to make the cutting edge tip position a designated position, and then cutting is performed.

  The inventor of the present invention, in the blade-tip replaceable tip 1, the vicinity of the apex 12 of the obtuse angle is higher than the vicinity of the corner 11 of the acute angle, the density of powder supply to the mold of the raw material powder is high, and the stability at the time of compacting is high It has been found that since the shrinkage due to sintering of the green compact is small, the strain is reduced. Specifically, when the green compact is liquid phase sintered, volume shrinkage of about 50% occurs. At this time, due to non-uniform powder feeding to the mold, temperature distribution in the sintering furnace, gravity, etc., the sintered body does not shrink into a completely similar shape of the green compact. Deformation occurs. For example, a site where there was a lot of powder feeding to the mold, that is, a site where the green compact density was high, a shrinkage amount during sintering was small, a site where there was little powder feeding to the mold, ie a site where the green compact density was low Has a large shrinkage during sintering. As described above, the non-uniformity of the press body density causes non-uniform shrinkage during sintering. As a result, the sintered body is not completely similar to the pressed body, but has a distorted shape. For example, when a complete cube is pressed and then sintered, it becomes a slightly distorted cube. For this reason, in order to obtain a sintered body having the shape as in the present embodiment, the vicinity of the acute corner 11 has a lower packing density of the raw material powder in the mold than the vicinity of the apex 12 of the obtuse angle, It has been found that distortion is large in the vicinity of the acute corner 11 due to a large amount of shrinkage due to a large distance.

  Therefore, as shown in FIG. 8, when the chip 1 is attached to the holder 50, the first region 21 in the vicinity of the apex 12 having an obtuse angle with a small distortion is supported by the holder 51 of the holder 50. The influence of distortion resulting from deformation can be reduced. According to the chip 1 of the present embodiment, the relationship between the a and the b satisfies the condition of 0.20 ≦ b / a ≦ 0.70. When the value of b / a exceeds 0.70, the holding area of the chip 1 on the holder 50 is narrowed, so that the positional accuracy is deteriorated. In addition, when the value of b / a is less than 0.20, the holding area in a portion with a lot of distortion becomes too wide, and the positional accuracy is deteriorated. That is, by satisfying the condition of 0.20 ≦ b / a ≦ 0.70, it is possible to improve the positional accuracy when attaching the blade-tip replaceable tip 1 to the holder 50. Therefore, the blade edge position correction amount can be reduced, and the time required for blade edge position correction when the user replaces the tip can be reduced.

  In addition, the inventor has focused on the distortion of the green compact obtained by compression molding, and has focused on the method of using the distortion. For this reason, even if it does not obtain high dimensional accuracy by polishing with a diamond grindstone or the like, it is possible to improve the positional accuracy when attaching the blade tip replaceable tip 1 to the holder 50. For this reason, manufacturing cost can be reduced. Furthermore, even if it does not have a complicated three-dimensional shape, the positional accuracy at the time of attaching the blade-tip-exchangeable tip 1 to the holder 50 can be improved. For this reason, since the case where a grinding | polishing process is impossible can be reduced, it can manufacture easily.

  In addition, a certain contact area between the tip and the holding portion 51 is required in order to increase the clamp strength of the blade-tip replaceable tip 1 to the holder 50. However, in the side non-polished tip, in order to minimize the influence of distortion, it is preferable from the viewpoint of realizing high blade edge position accuracy that only the portion with good linearity is in contact with the holder 50. As a result of investigating the balance between these two characteristic values (clamp strength / cutting edge position accuracy) that are trade-offs, it was found that the numerical range is more preferably 0.45 ≦ b / a ≦ 0.55. In addition, it is more preferable that the side polished tip also satisfies the condition of 0.45 ≦ b / a ≦ 0.55 in the same manner in relation to the processing accuracy on the holder side and the flatness of the contact portion with the tip. I found.

  In the cutting edge replaceable tip 1 of the present embodiment, preferably, the condition of 5 μm ≦ d ≦ 100 μm is satisfied, where d is the distance between the extension line 41 and the corner end point 16 of the cutting edge (see FIG. 4). . Thereby, possibility that the corner 11 and the holder 50 will contact is suppressed, and the deterioration of the blade edge position accuracy due to such contact can be suppressed. Moreover, since chip disposal property is maintained satisfactorily, deterioration of the surface roughness of the processed surface can be suppressed.

  In general, the larger the cutting edge angle, the higher the cutting resistance and the worse the chip disposal. As the d value increases, the cutting edge position accuracy tends to be improved, but on the other hand, since the cutting edge angle increases in a pseudo manner, phenomena such as an increase in cutting resistance and a deterioration in chip disposal may occur. As a result of investigating the balance between these two characteristic values that are tradeoffs, it was found that the d value is more preferably 40 μm or more and 80 μm or less.

  In the cutting edge replaceable tip 1 of the present embodiment, the corner 11 may be a round corner, and the radius of curvature of the corner may be 2.4 mm or less. In this case, even if the corner 11 is a round corner, the corner portion as a whole is an acute corner, and the density of the powder supply tends to be lower than the portion where the blunt apex 12 is located. Therefore, the present invention is particularly effective.

  In the cutting edge replaceable tip 1 of the present embodiment, the second region 22 may be curved. Even if it is such a shape, the blade edge | tip replacement | exchange type | mold chip | tip 1 of this Embodiment can improve the positional accuracy at the time of attaching to a holder.

  In the cutting edge-exchangeable tip 1 of the present embodiment, the second region 22 may be planar. The processing of the second region 22 is easier than when the second region 22 is curved.

  In the above-described blade edge replaceable chip 1, the edge angle of the corner 11 may be 80 ° or less. Even if it is such a shape, the blade edge | tip replacement | exchange type | mold chip | tip 1 of this Embodiment can improve the positional accuracy at the time of attaching to the holder 50. FIG.

  The blade-tip-exchangeable tip 1 includes another flank 30 formed at a position facing the flank 20, and the flank 20 and the other flank 30 extend perpendicular to the rake face 10. It may have a shape that is rotationally symmetric about a rotation axis that passes through the center of the rake face 10. Thereby, also about the corner formed in the edge part of the other flank 30, the deterioration of blade edge position accuracy can be suppressed similarly to the corner 11 located in the edge part of the said flank 20.

  In the blade-tip replaceable tip 1 of the present embodiment, preferably, the base material is a WC-based cemented carbide, cermet, high-speed steel, ceramics, cubic boron nitride sintered body, diamond sintered body, silicon nitride sintered body , At least one selected from the group consisting of aluminum oxide and titanium carbide. This embodiment is particularly effective for a chip manufactured from these materials by a sintering method.

  In the blade edge replaceable tip 1 of the present embodiment, the flank 20 may be a non-polished surface. Thereby, since the polishing step can be eliminated in the manufacture of the chip 1, the productivity and economic efficiency of the chip 1 can be improved. In addition, the degree of freedom in designing the chip shape can be increased.

  In the blade-tip replaceable tip 1 of the present embodiment, the rake face 10 is a non-ground surface of the work piece to be ground by the blade-tip replaceable tip 1 in a state where the blade-tip replaceable tip 1 is attached to the holder 50. Alternatively, it may be a negative shape formed so as to be perpendicular to the traveling direction of the holder 50 and tilted toward the traveling direction side with respect to a vertical plane perpendicular to the traveling direction of the holder 50. Even if it is such a shape, the blade edge | tip replacement | exchange type | mold chip | tip 1 of this Embodiment can improve the positional accuracy at the time of attaching to the holder 50. FIG.

  In the cutting edge replaceable tip 1 of the present embodiment, an opening 14 may be provided on the rake face 10. As a result, a lever lock type can be adopted as a method of holding the blade edge replaceable tip 1 on the holder.

  In the cutting edge replaceable tip 1 of the present embodiment, the flank 20 may be a surface that is not ground. Thereby, since the grinding process can be eliminated in the manufacture of the chip 1, the productivity and economic efficiency of the chip 1 can be improved. In addition, the degree of freedom in designing the chip shape can be increased.

  The manufacturing method of the blade-tip-exchangeable tip 1 according to the present embodiment includes a step of preparing raw materials, a step of forming green compacts by filling raw materials into a mold and compressing the raw materials, and green compacts. A sintered body having a rectangular shape on the outer periphery, a rake face 10 including an acute corner 11 and an obtuse apex 12 positioned on the outer periphery, and a rake. A side that is continuous with the side 13 sandwiched between the corner 11 and the apex 12 on the outer periphery of the surface 10, has a flank 20 extending in a direction intersecting with the rake face 10, and is an intersection line of the rake face 10 and the flank 20 13 is a cutting edge, the flank 20 is convex, and a first region 21 located on the apex 12 side and a second region 22 connected to the first region 21 and located on the corner 11 side Of the portion of the cutting edge that is continuous with the first region 21 The distance from the intersection 43 of the long line 41 and the line segment 42 extending in the direction perpendicular to the extension line 41 from the corner-side end point 16 of the cutting edge to the apex-side end point 17 of the cutting edge is defined as a, and the first of the cutting edges. When the distance from the first inflection point 15, which is the end point on the intersection side in the portion connected to the region 21, to the intersection point 43 is b, the condition of 0.20 ≦ b / a ≦ 0.70 is satisfied.

  Thereby, as shown in FIGS. 1-7, the blade-tip-exchange-type chip | tip 1 which can improve the positional accuracy at the time of attaching to the holder 50 can be manufactured.

  In the manufacturing method of the blade-tip replaceable tip 1 according to the present embodiment, preferably, a green compact having a shape satisfying the condition of 0.20 ≦ b / a ≦ 0.70 is formed. Thereby, the blade-tip-exchangeable chip 1 that can improve the positional accuracy when attached to the holder 50 can be manufactured by simplifying the manufacturing process.

In order to confirm the effect of the present invention, the following tests were conducted.
(Sample preparation)
Ten samples each of Invention Examples 1 to 11 and Comparative Examples 1 to 3 were produced by the following method.

First, it contains WC as a main component, contains 4.0 wt% TiC, 2.6 wt% TaC, 1.3 wt% NbC, and 7.0 wt% Co, with the remainder being inevitable impurities. The raw material powder blended in was pulverized and mixed with a ball mill, and then powdered into a mold for compacting. The green compact thus obtained was sintered at 1410 ° C. for 1 hour. The upper and lower surfaces of the sintered body were ground with a diamond grindstone, and subjected to a blade edge treatment by honing 0.06 mm as viewed from the rake face with a SiC brush. Further, using a known CVD method, TiN (0.3 μm) / MT-TiCN (5.3 μm) / TiBN (1.0 μm) / α-Al ₂ O ₃ (4.0 μm) / TiN (0.3 μm) A coating layer was formed on the sintered body.

  The shape of the sintered body was determined to be the shape of Sumitomo Electric Hardmetal Co., Ltd. DNMG150408N-GU except for the flank, and the flank was determined by adjusting the shape of a predetermined die (mortar). These tips were negative types, and the edge angle (θ1 in FIG. 1) was 55 °. The flank was not polished all around (non-polished surface).

  More specifically, in the present invention examples 1, 2, 4 to 6, 10, and 11, the second region 22 is configured by a single plane in the same manner as the blade-tip replaceable tip 1 shown in FIG. . Further, as shown in FIG. 5, the second region 22 (see FIG. 1) of Example 3 of the present invention has an arc shape with a radius of curvature of about 50 mm. In addition, as shown in FIG. 6, the second region 22 of Example 7 of the present invention is configured by two surfaces, and the obtuse angle side and the acute angle side from the center (second inflection point 18) of the second region 22. The distance between the line segment extending in parallel with the extension line 41 from the center of the second region and the corner end point 16 of the cutting edge was 7 μm. Further, the second region 22 of Example 8 of the present invention was formed by an arc having two radii of curvature as shown in FIG. More specifically, the arc on the side close to the apex 12 of the obtuse angle (the region located from the first inflection point 15 to the second inflection point 19) is an arc having a radius of curvature of about 80 mm, and has an acute corner. An arc closer to 11 (region located from the second inflection point 19 to the corner 11) was an arc having a radius of curvature of about 40 mm, and the arc lengths of these two arcs were the same.

  Moreover, about the comparative example 1, as shown in FIG. 11, the 2nd area | region mentioned above was not formed, but the flank 120 was comprised by one plane. In Comparative Examples 2 and 3, the configuration of the flank 20 was the same as that of the blade-tip replaceable tip 1 shown in FIG. 1, and the second region 22 was configured by a single plane as shown in FIG. . However, in Comparative Examples 2 and 3, the value of b / a described above was set to be out of the numerical range defined in the present invention.

  In addition, the value of b / a and d of this invention examples 1-11 and comparative examples 1-3 is described in Table 1 mentioned later.

  Ten samples (chips) as described above were produced for each of Invention Examples 1 to 11 and Comparative Examples 1 to 3. That is, the cutting edge (acute angle side corner) used for cutting became 40 cutting edges.

(Test method)
(1) Shape measurement The shape measurement was performed about the sintered compact (chip | tip) which is the sample produced as mentioned above. As a shape measuring method, the tip 1 is arranged as shown in FIG. 9, and the tip is used by using a stylus type contour shape measuring device (CV-4000H stylus tip radius 25 μm with needle tip correction available). The shape of 1 was measured. Specifically, the measurement of the contour shape of the chip 1 was performed by scanning the flank of the chip, which is the specimen, of the measuring instrument in the direction of the arrow in FIG.

(2) Measurement of cutting edge position accuracy in attaching to and removing from the holder 1) 40 cutting edges for each of the above-mentioned samples using the holder PDJNR2525-43 made by Sumitomo Electric Hardmetal Co., Ltd., 2 The blade edge position was measured using a dial gauge, and 3) the cutting edge was removed, and the difference (called the blade edge adjustment width) between the maximum value and the minimum value of the blade edge position accuracy was measured. Further, the standard deviation of the blade edge position (blade edge adjustment width) was calculated.

(3) Measurement of working time for attaching to and removing from the holder In addition, using the 40 corners of the present invention example 2 and comparative example 1, the work for adjusting the cutting edge position by attaching to the cutting tool was performed 40 times. The time required for the work was calculated.

(result)
The measurement results of the above-described shape measurement and blade edge position accuracy are shown in Table 1 below.

  As can be seen from Table 1, Examples 1 to 11 of the present invention satisfying the condition of 0.20 ≦ b / a ≦ 0.70 do not satisfy the condition of 0.20 ≦ b / a ≦ 0.70. Compared to 3, the blade edge adjustment width and the standard deviation were small. From these results, it was found that Examples 1 to 11 of the present invention can improve the positional accuracy when attached to the holder. Therefore, it has been found that when the user uses the chips according to Examples 1 to 11 of the present invention, the time required for blade edge adjustment can be reduced.

  Further, in the measurement of the working time described above, it was confirmed that the working example 2 of the present invention was about 1/3 of the working time required for blade edge position adjustment as compared with the comparative example 1.

  In addition, Inventive Example 11 was slightly inferior in gloss on the processed surface as compared with Inventive Examples 1-10. From this result, it was found that when the distance between the extension line and the end point on the corner side of the cutting edge is d, the characteristics can be further improved by satisfying the condition of d ≦ 96 μm.

In order to confirm the effect of the present invention, the following tests were conducted.
(Sample preparation)
Ten samples each of Invention Examples 12 to 22 and Comparative Examples 4 to 6 were produced by the following method.

First, WC is the main component, 0.4 wt% TaC, 0.8 wt% NbC, 0.3 wt% Cr ₃ C ₂ , and 10.5 wt% Co, with the remainder being inevitable impurities. The raw material powder blended so as to consist of was pulverized and mixed with a ball mill, then fed into a mold and press-molded. The press body thus obtained was sintered at 1380 ° C. for 1 hour. The upper and lower surfaces of this sintered body were ground with a diamond grindstone, and subjected to a cutting edge treatment by honing of 0.04 mm as viewed from the rake face with a SiC brush. Furthermore, a super multi-layer film (3.2 μm) / TiArCrCN (0.2 μm) coating layer in which TiAlCrN and TiSiCrN were laminated to a thickness of 20 nm was formed using a known PVD method.

  The shape other than the flank is the model number VNMA160404 specified in JIS B4120-1998, and the shape of the flank in each sample of the inventive examples 12-22 and the comparative examples 4-6 is that of the predetermined die described above. It was determined by adjusting the shape. These tips were negative and the edge angle was 35 °. The values of b / a and d of Examples 12 to 22 of the present invention and Comparative Examples 4 to 6 manufactured in this way are described in Table 2 described later. The flank was not polished all around (non-polished surface).

(Test method)
(1) Shape measurement The shape measurement was performed about the sintered compact (chip | tip) which is the sample produced as mentioned above. As a shape measuring method, the chip 1 is placed on the surface plate 60 as shown in FIG. 10, and the shape of the chip is measured using a laser-type non-contact three-dimensional shape measuring machine (Keyence Corporation KS-1100) as a measuring machine. did. Specifically, laser light was irradiated in the direction of arrow 72 in FIG. 10 on the flank face of the sample chip, and the laser light source was scanned in the direction of arrow 71.

(2) Measurement of cutting edge position accuracy in attaching / detaching to / from holder Using 1) mounting and 2) dial for each of the above-mentioned samples using the DVJNR2525M16 turning holder made by Sumitomo Electric Hardmetal Co., Ltd. Measurement of the blade edge position using a gauge, 3) removal of the cutting edge, and the difference between the maximum value and the minimum value of the blade edge position accuracy (called the blade edge adjustment width) was measured. Further, the standard deviation of the blade edge position (blade edge adjustment width) was calculated.

(3) Measurement of working time for attachment / detachment to / from holder In addition, using the 40 corners of Example 13 and Comparative Example 4 of the present invention, the work of adjusting the cutting edge position by attaching to the above-described tool was performed 40 times. The time required for the work was calculated.

(result)
The measurement results of the above-described shape measurement and blade edge position accuracy are shown in Table 2 below.

  As can be seen from Table 2, Invention Examples 12 to 22 satisfying the condition of 0.20 ≦ b / a ≦ 0.70 do not satisfy the condition of 0.20 ≦ b / a ≦ 0.70. Compared to 6, the blade edge adjustment width and the standard deviation were small. From these results, it was found that Examples 12 to 22 of the present invention can improve the positional accuracy when attached to the holder. Therefore, it has been found that when the user uses the chips according to Examples 12 to 22 of the present invention, the time required for blade edge adjustment can be reduced.

  Further, in the above-described measurement of the working time, it was confirmed that Working Example 13 required for adjusting the cutting edge position was about 1/3 compared with Comparative Example 4.

  Further, Invention Example 22 was slightly inferior in gloss on the processed surface as compared with Invention Examples 12-21. From this result, it was found that when the distance between the extension line and the end point on the corner side of the cutting edge is d, the characteristics can be further improved by satisfying the condition of d ≦ 96 μm.

In order to confirm the effect of the present invention, the following tests were conducted.
(Sample preparation)
Ten samples each of Invention Examples 23 and 24 and Comparative Example 7 were prepared by the following method.

Containing WC as the main component, including 0.3 wt% TiC, 0.6 wt% TaC, 0.3 wt% NbC, and 6.0 wt% Co, with the balance being inevitable impurities The raw material powder was pulverized and mixed with a ball mill, and then powdered into a mold and pressed. The pressed body thus obtained was sintered at 1450 ° C. for 1 hour. The upper and lower surfaces of the sintered body were ground with a diamond grindstone, and subjected to a blade edge treatment by honing 0.06 mm as viewed from the rake face with a SiC brush. Further, using a known CVD method, TiN (0.3 μm) / MT-TiCN (8.5 μm) / TiBN (0.8 μm) / α-Al ₂ O ₃ (6.1 μm) / TiC (0.2 μm) After forming a coating layer of / TiN (0.2 μm) on the sintered body, the surface of the coating layer was smoothed using a diamond brush.

  The shape of the sintered body was Sumitomo Electric Hardmetal Co., Ltd. DNMG150408N-GU except for the flank, and the flank was determined by adjusting the shape of a predetermined die (mortar). These tips were negative type, and the edge angle (θ1 in FIG. 1) was 80 °. The values of b / a and d of Examples 23 and 24 of the present invention and Comparative Example 7 thus produced are described in Table 3 described later. The flank was not polished all around (non-polished surface).

(Test method)
(1) Shape measurement In the shape measurement method, a cut surface at a point 0.5 mm below a plane parallel to the rake face was embedded and lapped for observation and measurement.

(2) Measurement of cutting edge position accuracy in attachment / detachment to / from the holder 1) Attachment of 40 cutting edges with respect to each of the above-mentioned samples using a turning holder PCLNR2525-43 manufactured by Sumitomo Electric Hardmetal Co., Ltd. The blade edge position was measured using a dial gauge, and 3) the cutting edge was removed, and the difference (called the blade edge adjustment width) between the maximum value and the minimum value of the blade edge position accuracy was measured. Further, the standard deviation of the blade edge position (blade edge adjustment width) was calculated.

(3) Measurement of working time for attachment / detachment to / from holder In addition, using the 40 corners of Example 24 and Comparative Example 7 of the present invention, the work of attaching the cutting tool to the above-mentioned cutting tool was performed 40 times. The time required for the work was calculated.

(result)
Table 3 below shows the measurement results of the shape measurement and the edge position accuracy described above.

  As can be seen from Table 3, Invention Examples 23 and 24 satisfying the condition of 0.20 ≦ b / a ≦ 0.70 do not satisfy the condition of 0.20 ≦ b / a ≦ 0.70. Compared to the above, the blade edge adjustment width and the standard deviation were small. From these results, it was found that Examples 22 and 23 of the present invention can improve the positional accuracy when attached to the holder. Therefore, it has been found that when the user uses the inserts according to Invention Examples 23 and 24, the time required for blade edge adjustment can be shortened.

  Further, in the measurement of the working time described above, it was confirmed that the working example 24 required for adjusting the blade edge position was about 1/3 as compared with Comparative Example 7.

In order to confirm the effect of the present invention, the following tests were conducted.
(Sample preparation)
Ten samples each of Invention Examples 25 and 26 and Comparative Example 8 were prepared by the following method.

  80 wt% composite carbide (consisting of 75 wt% TiCN, 15 wt% WC and 10 wt% NbC), 5.0 wt% WC, 5.0 wt% TiCN, and 3.0 wt% Ni Then, the raw material powder blended so as to consist of 7.0 wt% Co was pulverized and mixed with a ball mill, and then powdered into a mold and press-molded. The press body thus obtained was sintered at 1430 ° C. for 1 hour in a nitrogen atmosphere of 1.0 kPa. The upper and lower surfaces and the side surfaces (entire surface) of the sintered body were ground with a diamond grindstone, and a cutting edge treatment by chamfer honing of 0.1 mm × −20 ° was performed with the diamond grindstone.

  The shape of the sintered body was model number DNGA150408 defined in JIS B4120 1998 except for the flank, and the flank was determined by polishing with a diamond grindstone. These tips were negative, and the edge angle (θ1 in FIG. 1) was 55 °. The values of b / a and d of Examples 25 and 26 of the present invention and Comparative Example 8 produced as described above are described in Table 4 described later. The rake face and flank face were fully polished.

(Test method)
(1) Shape measurement The shape measurement method was the same as in Example 1.

(2) Measurement of cutting edge position accuracy in attachment / detachment to / from holder 1) Attachment of 40 cutting edges with respect to each sample described above using Sumitomo Electric Hardmetal Co., Ltd.'s turning holder PDJNR2525-43 The blade edge position was measured using a dial gauge, and 3) the cutting edge was removed, and the difference (called the blade edge adjustment width) between the maximum value and the minimum value of the blade edge position accuracy was measured. Further, the standard deviation of the blade edge position (blade edge adjustment width) was calculated.

(3) Measurement of working time for attachment / detachment to / from holder In addition, using the 40 corners of Example 26 and Comparative Example 8 of the present invention, the work of attaching the cutting tool to the above-mentioned cutting tool was performed 40 times. The time required for the work was calculated.

(result)
Table 4 below shows the measurement results of the shape measurement and the edge position accuracy described above.

  As can be seen from Table 4, the inventive examples 25 and 26 that satisfy 0.20 ≦ b / a ≦ 0.70 are compared with the comparative example 8 that does not satisfy 0.20 ≦ b / a ≦ 0.70, and the blade edge adjustment width. And the standard deviation was small. From these results, it was found that Examples 27 and 28 of the present invention can improve the positional accuracy when attached to the holder. Therefore, it has been found that when the user uses the chips according to the inventive examples 25 and 26, the time required for blade edge adjustment can be shortened.

  Further, in the measurement of the working time described above, it was confirmed that the working example 26 of the present invention was about 3/4 of the working time required for adjusting the blade edge position as compared with the comparative example 8.

In order to confirm the effect of the present invention, the following tests were conducted.
(Sample preparation)
Ten samples each of Invention Examples 27 and 28 and Comparative Example 9 were prepared by the following method.

From a 48 wt% of TiCN, and 10 wt% of TiC, and 2 wt% of TaN, and NbC in 4 wt%, and 14 wt% of WC, and Mo ₂ C in 7 wt%, and 5 wt% of Ni, and 10 wt% of Co The raw material powder blended as described above was pulverized and mixed with a ball mill, and then powdered into a mold and pressed. The pressed body thus obtained was sintered at 1500 ° C. for 1 hour in a nitrogen atmosphere of 0.3 kPa. The upper and lower surfaces of the sintered body were ground with a diamond grindstone, and subjected to a cutting edge treatment by a honing of 0.05 mm as viewed from the rake face with a diamond brush.

  The shape of the sintered body was Sumitomo Electric Hardmetal Co., Ltd. VCMT160404N-LU except for the flank, and the flank was determined by adjusting the shape of a predetermined die (mortar). These tips were positive type, and the edge angle (θ1 in FIG. 1) was 35 °. The values of b / a and d of Examples 27 and 28 of the present invention and Comparative Example 9 thus produced are described in Table 5 described later. The flank was not polished all around (non-polished surface).

(Test method)
(1) Shape measurement The shape measurement method was the same as in Example 2.

(2) Measurement of cutting edge position accuracy in attachment / detachment to / from the holder 1) Attachment of 20 cutting edges with respect to each of the above-described samples using the holder SVJCR2525-33 manufactured by Sumitomo Electric Hardmetal Co., Ltd., 2 The blade edge position was measured using a dial gauge, and 3) the cutting edge was removed, and the difference between the maximum value and the minimum value of the blade edge position accuracy (called the blade edge adjustment width) was measured. Further, the standard deviation of the blade edge position (blade edge adjustment width) was calculated.

(3) Measurement of work time for attachment / detachment to / from holder In addition, the work of adjusting the cutting edge position by actually attaching the tool to the above-described tool using the 20 corners of the present invention example 28 and comparative example 9 was performed 40 times. The time required for the work was calculated.

(result)
The measurement results of the above-described shape measurement and blade edge position accuracy are shown in Table 5 below.

  As can be seen from Table 5, the inventive examples 27 and 28 satisfying 0.20 ≦ b / a ≦ 0.70 are compared with the comparative example 9 not satisfying 0.20 ≦ b / a ≦ 0.70. The width and standard deviation were small. From these results, it was found that Examples 27 and 28 of the present invention can improve the positional accuracy when attached to the holder. Therefore, when the user uses the tip according to Examples 27 and 28, the time required for blade edge adjustment can be reduced.

  Further, in the measurement of the working time described above, it was confirmed that Working Examples 27 and 28 were about 1/4 of the working time required for adjusting the blade edge position as compared with Comparative Example 9.

In order to confirm the effect of the present invention, the following tests were conducted.
In this example, a sintered body was produced by the same method as in Example 1, a blade edge treatment and a coating layer were formed, and except for the flank, Sumitomo Electric Hardmetal Co., Ltd. CNMG1906XXN-UX (XX is the curvature of the corner R) A chip having a shape of radius (unit: mm) × 10) was prepared. For example, when the radius of curvature of the corner is 0.8 mm in CNMG1906XXN-UX, it is CNMG190608N-UX.

  Specifically, the corner curvature radii are five types of 0.8 mm, 1.2 mm, 1.6 mm, 2.4 mm, and 3.2 mm, and the chip according to the present invention is used for each of the corner radii of curvature. Ten chips and 10 chips of comparative examples were prepared. All of the five types of chips of the present invention have b / a = 0.45 and d (μm) = 60, and all of the five types of comparative examples have b / a = 0 and d (μm) = 0. did.

  The blade edge adjustment width and the standard deviation were measured in the same manner as in Example 1 for each of these 10 types of chips.

  As a result, it was found that the cutting edge adjustment width and the standard deviation of the four types of inserts of the present invention examples having corner curvature radii of 2.4 mm or less improved by 50% or more compared to the comparative inserts having the same curvature radii. It was.

  On the other hand, the tip of the example of the present invention having a corner radius of curvature of 3.2 mm improved the edge adjustment width and the standard deviation by 10% or less compared to the tip of the comparative example having the same radius of curvature.

  From these results, it was found that the effect of the present invention that the positional accuracy when attaching to the holder can be improved can be more remarkably achieved by setting the radius of curvature of the corner to 2.4 mm or less.

  It should be understood that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is shown not by the above-described embodiment but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

  The blade tip replaceable tip and the blade tip replaceable tip manufacturing method according to the present invention can reduce the blade position correction amount when the tip is attached to a general holder, and can be used for correcting the blade tip position when the user replaces the tip. The present invention can be applied particularly advantageously to a blade-tip replaceable tip and a method for manufacturing a blade-tip replaceable tip, which are required to reduce the time required.

  1 chip, 10 rake face, 11 corner, 12 apex, 13, 13a, 13b side, 14, 114 opening, 15 first inflection part, 16 corner side end point, 17 apex side end point, 18, 19 second Inflection part, 20 flank, 21 1st region, 22 2nd face, 30 other flank, 41 extension line, 42 line segment, 43 intersection, 50 holder, 51 holder, 60 surface plate, 71 , 72 arrows, θ1, θ2 angles.

Claims (13)

A rake face including an acute corner and an obtuse apex located on the outer periphery, the outer shape is rectangular;
A flank that extends in a direction intersecting with the rake face, connected to a side sandwiched between the corner and the apex at the outer periphery of the rake face,
The side that is the intersection of the rake face and the flank face is a cutting edge;
The flank is convex, and includes a first region located on the apex side and a second region located on the corner side that is continuous with the first region,
The apex side of the cutting edge from the intersection of the extension line of the cutting edge connected to the first region and the line segment extending from the corner-side end point of the cutting edge in a direction perpendicular to the extension line And the distance to the end point of
When the distance from the end point on the intersection side in the portion continuous with the first region of the cutting edge to the intersection point is b,
A blade-exchangeable tip that satisfies the condition of 0.20 ≦ b / a ≦ 0.70. When the distance between the extension line and the end point on the corner side of the cutting edge is d,
The blade-tip replaceable tip according to claim 1, wherein the condition of 5 µm ≤ d ≤ 100 µm is satisfied.   The blade edge replaceable tip according to claim 1 or 2, wherein the corner is a round corner, and a radius of curvature of the corner is 2.4 mm or less.   The blade tip replaceable tip according to any one of claims 1 to 3, wherein the second region is curved.   The blade tip replaceable tip according to any one of claims 1 to 3, wherein the second region is planar.   The blade tip replaceable tip according to any one of claims 1 to 5, wherein an angle of the corner is 80 ° or less. Further comprising another flank formed at a position facing the flank,
The flank and the other flank have a shape that is perpendicular to the rake face and is rotationally symmetric about a rotation axis that passes through the center of the rake face. The cutting edge-replaceable tip according to claim 1.   The base material constituting the blade-tip-exchangeable tip is WC-based cemented carbide, cermet, high speed steel, ceramics, cubic boron nitride sintered body, diamond sintered body, silicon nitride sintered body, aluminum oxide and carbonized The blade tip replaceable tip according to any one of claims 1 to 7, wherein the tip is at least one selected from the group consisting of titanium.   The blade tip replaceable tip according to any one of claims 1 to 8, wherein the flank surface is a non-polished surface. With the blade tip replaceable tip attached to a holder,
The rake face is perpendicular to the non-grinding surface of the workpiece to be ground by the blade-tip replaceable tip, and is inclined to the traveling direction side with respect to the vertical surface perpendicular to the traveling direction of the holder. The blade-tip-exchangeable tip according to any one of claims 1 to 9, which has a negative shape formed as described above.   The blade-tip-exchangeable tip according to any one of claims 1 to 10, wherein an opening is provided on the rake face.   The blade-tip replaceable tip according to any one of claims 1 to 11, wherein the flank surface is a surface that is not ground. Preparing the raw materials; and
Forming a green compact by filling the raw material in a mold and compressing the raw material;
Heating the green compact to obtain a sintered body,
The sintered body is
A rake face including an acute corner and an obtuse apex located on the outer periphery, the outer shape is rectangular;
A flank that extends in a direction intersecting with the rake face, connected to a side sandwiched between the corner and the apex at the outer periphery of the rake face,
The side that is the intersection of the rake face and the flank face is a cutting edge;
The flank is convex and includes a first region located on the apex side, and a second region located on the corner side, connected to the first region,
The apex side of the cutting edge from the intersection of the extension line of the cutting edge connected to the first region and the line segment extending from the corner-side end point of the cutting edge in a direction perpendicular to the extension line And the distance to the end point of
When the distance from the end point on the intersection side in the portion continuous with the first region of the cutting edge to the intersection point is b,
A method for manufacturing a blade-tip-exchangeable tip that satisfies the condition of 0.20 ≦ b / a ≦ 0.70.

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