JP2012000699A - Cutting edge replaceable tip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting edge replaceable tip that improves the surface roughness and surface gloss of a work to be cut.SOLUTION: The cutting edge replaceable tip 1 having a substantially polygonal, planar shape, includes: a rectilinear blade 11 provided in a position corresponding to a side of a polygon; a curved blade 21 provided in a position corresponding to an apex of the polygon; and an overhang blade 31 provided between the rectilinear blade 11 and the curved blade 21, and overhanging toward the outside of the polygon with respect to the rectilinear blade 11.

Description

  The present invention relates to a blade-tip replaceable tip, and more particularly to a blade-tip replaceable tip used for a cutting tool for cutting.

  Some cutting tools used for cutting include one or a plurality of blade-tip-exchangeable chips as cutting edges. In the cutting edge replacement type insert, improvement of surface roughness and surface gloss of the work material are important issues along with improvement of wear resistance, improvement of cutting edge strength and improvement of chip disposal.

  A common blade tip insert has a linear main cutting edge that plays a major role in chip generation in cutting action, and a linear front cutting edge that generates a finished surface. A round corner, which is a rounded corner, is defined between the blade and the blade. In order to improve the surface roughness and surface gloss of the work material, the shape near the joint between the round corner and the front cutting edge is very important. In other words, since the tool shape of the joint between the round corner and the front cutting edge is finally transferred to the work material, the shape in the vicinity of the joint between the round corner and the front cutting edge is the surface roughness of the work material. Greatly affects gloss.

  For improving the surface roughness of the work material, many technical developments have conventionally been made, as proposed in Patent Documents 1 to 6, for example. In the technique disclosed in the above document, a tool is formed by forming a corner defined between the main cutting edge and the front cutting edge with a plurality of arcs having different curvatures, and forming a cutting edge processing portion with a plurality of arcs. Performance improvements are being made.

JP 2001-212703 A JP 2003-175408 A US Pat. No. 6,612,786 JP 2005-324324 A International Publication No. 2004/098821 US Pat. No. 5,226,761

  As described above, various techniques for improving the surface roughness and surface gloss of a work material have been proposed so far with regard to the blade-tip-exchangeable tip. However, in order to improve the machining accuracy in cutting using a blade-tip-exchangeable tip, it is required to further improve the surface roughness and surface gloss of the work surface to be machined. However, this is not always sufficient and there is room for further improvement.

  The present invention has been made in view of the above problems, and a main object thereof is to provide a blade-tip-exchangeable tip that can improve the surface roughness and surface gloss of a work material.

  The inventors diligently studied the configuration of a blade-tip-exchangeable tip that can improve the surface roughness and surface gloss of the work material. As a result, it has been found that the surface gloss of the work material can be improved by providing a convex portion between the straight portion of the flank face and the round corner in the blade-tip replaceable tip, and the present invention has the following configuration.

  The blade tip replaceable tip according to the present invention is a blade tip replaceable tip having a substantially polygonal planar shape, and corresponds to a linear blade portion provided at a position corresponding to a side of the polygon and a vertex of the polygon. A curvilinear blade provided at a position to be mounted, and a protruding blade provided between the linear blade and the curvilinear blade and projecting toward the outside of the polygon with respect to the straight blade. .

  In the above blade tip replaceable chip, the height of the protruding blade portion protruding from the linear blade portion may be 2 μm or more and 200 μm or less.

  In the above-described blade-tip-exchangeable tip, the length of the extended blade portion extending in the extending direction of the linear blade portion may be 5 μm or more and 500 μm or less.

  In the above-mentioned blade tip replaceable tip, the overhanging blade portion has a maximum overhanging portion that protrudes largest toward the outside of the polygon with respect to the linear blade portion, and the curved blade portion is connected to the maximum overhanging portion. May be.

  In the above-mentioned blade edge replaceable chip, the overhanging blade portion may protrude toward the outside of the polygon with respect to the curved blade portion.

In the above-mentioned blade-tip-exchangeable tip, the overhanging blade portion may have a curved planar shape.
In the blade-tip-exchangeable tip, the curvature radius of the protruding blade portion may be not less than 100 μm and not more than 30000 μm.

  The blade-tip-exchangeable tip includes a second linear blade portion provided at a position corresponding to a second side that forms the vertex of the polygon formed with the curved blade portion together with the linear blade portion, It may be provided between the 2nd linear blade part and the curvilinear blade part, and may be provided with the 2nd overhanging blade part which protrudes toward the outside of a polygon to the 2nd linear blade part. .

  The blade-tip-exchangeable tip includes a second linear blade portion provided at a position corresponding to a second side that forms the vertex of the polygon formed with the curved blade portion together with the linear blade portion, The second straight blade portion may be directly connected to the curved blade portion.

  The above-mentioned blade-tip-replaceable insert has a rake face that comes into contact with the chips of the work material during cutting and a flank face that comes into contact with the work material. It may be formed over the flank.

  In the above-mentioned blade-tip-exchangeable tip, the overhanging blade portion may be formed over the flank within a range of 0.2 mm or more from the ridgeline.

  In the above-mentioned blade-tip-exchangeable tip, the overhanging blade portion may be formed over the entire flank from the ridgeline.

  In the blade edge replaceable chip, the blade edge replaceable chip may be a negative chip.

  According to the tip replacement type insert of the present invention, the surface roughness and surface gloss of the work material can be improved.

It is a perspective view which shows the external appearance of the blade-tip-exchangeable chip according to Embodiment 1 of the present invention. It is a top view of the blade-tip-exchangeable tip shown in FIG. It is a figure which shows the 1st example which expanded the area | regions III and IV vicinity in FIG. It is a figure which shows the 2nd example which expanded the area | regions III and IV vicinity in FIG. FIG. 3 is an enlarged cross-sectional view of the blade edge replaceable tip according to the first embodiment. It is a figure which shows the 1st example which expanded the protrusion blade part vicinity of the blade-tip-exchange-type chip | tip. It is sectional drawing of the blade-tip-exchangeable chip | tip along the VII-VII line shown in FIG. It is a figure which shows the 2nd example which expanded the extension blade part vicinity of the blade-tip-exchange-type chip | tip. It is sectional drawing of the blade-tip-exchangeable chip | tip along the IX-IX line | wire shown in FIG. FIG. 6 is a perspective view showing an external appearance of a blade edge replaceable chip according to a second embodiment. FIG. 10 is a perspective view showing an appearance of a blade edge replaceable chip according to a third embodiment. FIG. 6 is an enlarged cross-sectional view of a blade edge replaceable tip according to a third embodiment. It is a top view of the tool to which the blade edge | tip-exchange-type chip | tip of Embodiment 4 was fixed. It is a front view of the tool shown in FIG. It is the side view of the tool seen from the arrow XV direction shown in FIG. It is the side view of the tool seen from the arrow XVI direction shown in FIG. It is a schematic diagram which shows the arrangement | positioning of a blade-tip-exchange-type chip | tip and work material when cutting the surface of a work material. It is a figure which shows the 1st example which expanded the blade-tip-exchange-type chip | tip of Embodiment 4. FIG. It is a figure which shows the 2nd example which expanded the blade-tip-exchange-type chip | tip of Embodiment 4. FIG. FIG. 10 is a plan view of a tool to which a blade tip replaceable chip according to a fifth embodiment is fixed. It is a figure which shows the 1st example which expanded the blade-tip-exchange-type chip | tip of Embodiment 5. FIG. It is a figure which shows the 2nd example which expanded the blade-tip-exchange-type chip | tip of Embodiment 5. FIG.

  Embodiments of the present invention will be described below 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.

(Embodiment 1)
FIG. 1 is a perspective view showing an external appearance of a blade-tip-exchangeable tip 1 according to Embodiment 1 of the present invention. FIG. 2 is a plan view of the blade-tip replaceable tip 1 shown in FIG. As shown in FIG. 1 and FIG. 2, the blade-tip replaceable tip 1 includes a rake face 2 that comes into contact with chips of the work material during cutting and flank surfaces 4 and 5 that come into contact with the work material during cutting. Prepare. As shown in FIG. 2, the blade edge replaceable tip 1 has a substantially polygonal planar shape. The blade tip replaceable tip 1 is formed in a substantially quadrangular prism shape. The rake face 2 forms the upper surface of the substantially quadrangular prism-shaped blade edge replaceable tip 1. The flank surfaces 4 and 5 form the side surface of the substantially quadrangular prism-shaped blade tip replaceable tip 1.

  A mounting hole 8 that penetrates the blade tip replaceable tip 1 in the thickness direction is formed in the center of the planar shape of the blade tip replaceable tip 1. The blade-tip-exchangeable tip 1 is fixed to the tool using a fastening member typified by a countersunk screw or the like that passes through the mounting hole 8. In addition, the blade-tip-exchangeable tip 1 may be fixed to the tool by, for example, brazing without using a fastening member, and in this case, the mounting hole 8 may not be formed. An uneven chip breaker 9 is formed on the rake face 2. The chip breaker 9 has a function of forcibly dividing chips of a work material generated during cutting.

  The rake face 2 that is the upper surface of the blade tip replaceable tip 1 and the lower surface of the blade tip replaceable tip 1 have the same planar shape and are arranged in parallel to each other. In the blade-tip replaceable tip 1, the straight blade portions 11 to 14 are formed on the ridgeline formed at the intersection where the upper surface and the side surface of the blade-tip replaceable tip 1 intersect, and the ridgeline is used as a cutting blade. A ridge line formed at the intersection where the lower surface and side surface of the blade-tip-exchangeable chip 1 intersect can also be used as a cutting blade. In the blade-tip-exchangeable chip 1, each side of the upper surface and each side of the lower surface can be used as a cutting blade, which is excellent in economic efficiency.

  As shown in FIG. 2, the blade-tip replaceable tip 1 has a substantially rhombic planar shape. Curved blade portions 21 and 22 are provided at corner portions corresponding to the apexes of a rhombus that forms an acute angle. The curved blade portion 21 has an arcuate planar shape. The straight blade portions 11 and 12 are provided at positions corresponding to two intersecting sides of the rhombus. The linear blade portion 11 as the first linear blade portion is provided at a position corresponding to the first side of the rhombus. The straight blade portion 12 as the second straight blade portion is provided at a position corresponding to the second side of the rhombus that forms the apex of the rhombus formed with the curved blade portion 21 together with the straight blade portion 11. It has been.

  FIG. 3 is a diagram showing a first example in which the vicinity of regions III and IV in FIG. 2 is enlarged. In FIG. 3, the linear blade portions 11 and 12 formed on two adjacent sides of the polygon formed by the planar shape of the blade-tip-exchangeable chip 1 and the vertexes of the polygon intersecting the two adjacent sides are formed. The curved blade portion 21 is shown.

  An overhanging blade portion 31 is provided between the linear blade portion 11 and the curved blade portion 21. The overhanging blade portion 31 protrudes toward the outside of the substantially rhombus formed by the rake face 2 with respect to the linear blade portion 11. The overhanging blade portion 31 protrudes from the end portion of the linear blade portion 11 toward the outward direction of the planar shape of the blade tip replaceable tip 1. The overhanging blade portion 31 has a maximum overhanging portion 32 that protrudes largest toward the outside of the polygon with respect to the linear blade portion 11. The curved blade portion 21 is continuously connected to the maximum overhang portion 32. The overhanging blade portion 31 is smoothly connected to the curved blade portion 21 at the maximum overhanging portion 32. For example, the protruding blade portion 31 and the curved blade portion 21 share a tangent line at the maximum protruding portion 32 and are connected so that no corner is formed between the protruding blade portion 31 and the curved blade portion 21. Also good.

  The overhanging blade portion 31 has a curved planar shape. For example, the protruding blade portion 31 may have an arc-shaped planar shape having a center point C and a radius of curvature R of 100 μm or more and 30000 μm or less, or may have any other curved planar shape. Good. The height H at which the protruding blade portion 31 protrudes toward the outside of the polygon with respect to the linear blade portion 11 is 2 μm or more and 200 μm or less. The height H indicates the distance between the extension line of the linear blade portion 11 and the maximum overhang portion 32. The length L in which the overhanging blade portion 31 extends in the extending direction of the linear blade portion 11 is not less than 5 μm and not more than 500 μm. The length L indicates the distance between the linear blade portion 11 and the curved blade portion 21 in the direction in which the linear blade portion 11 extends.

  Between the linear blade portion 12 and the curved blade portion 21, a protruding blade portion 33 as a second protruding blade portion is provided. The overhanging blade portion 33 protrudes toward the outside of the substantially rhombus formed by the rake face 2 with respect to the linear blade portion 12. The overhanging blade portion 33 protrudes from the end portion of the linear blade portion 12 toward the outward direction of the planar shape of the blade tip replaceable tip 1. The overhanging blade portion 33 has a maximum overhanging portion 34 that protrudes largest toward the outside of the polygon with respect to the linear blade portion 12. The curved blade portion 21 is continuously connected to the maximum overhang portion 34. The extended blade portion 33 is smoothly connected to the curved blade portion 21 at the maximum extended portion 34. For example, the extended blade portion 33 and the curved blade portion 21 share a tangent line at the maximum extended portion 34 and are connected so that no corner is formed between the extended blade portion 33 and the curved blade portion 21. Also good.

  The overhanging blade portion 33 has a curved planar shape. For example, the projecting blade portion 33 may have an arc-shaped planar shape having a center point C and a radius of curvature R of 100 μm or more and 30000 μm or less, or may have any other curved planar shape. Good. The height H at which the protruding blade portion 33 protrudes toward the outer side of the polygon with respect to the straight blade portion 12 is not less than 2 μm and not more than 200 μm. The height H indicates the distance between the extended line of the linear blade portion 12 and the maximum overhang portion 34. The length L of the overhanging blade portion 33 extending in the extending direction of the linear blade portion 12 is not less than 5 μm and not more than 500 μm. The length L indicates the distance between the linear blade portion 12 and the curved blade portion 21 in the direction in which the linear blade portion 12 extends.

  The blade-tip-exchangeable tip 1 is formed as a tip with no right and left sides. That is, in the cutting process using the blade tip replaceable tip 1, the linear blade portion 11 may be used as the main cutting edge and the linear blade portion 12 may be used as the front cutting edge, while the linear blade portion 12 is used as the main cutting edge. The straight blade portion 11 may be used as a front cutting edge as a cutting edge. A protruding blade portion having a convex shape that protrudes outward with respect to the front cutting edge is provided between the linear blade portion that is the front cutting edge and the curved blade portion 21. When the front cutting edge finishes the processed surface of the work material, the projecting protruding blade portion is pressed against the work material. Thereby, the effect similar to enlarging the curvature radius of the circular-arc-shaped curvilinear blade part 21 can be acquired, and the surface roughness and surface gloss of the processed surface of a workpiece can be improved.

  Therefore, the advantages of the cutting edge replaceable tip 1 having the curved blade portion 21 having a small radius of curvature, such as low cutting resistance and high degree of freedom, and the cutting edge replaceable tip 1 having the curved blade portion 21 having a large curvature radius. Thus, it is possible to provide the blade-tip-exchangeable tip 1 that has the advantage of the excellent roughness of the processed surface and can obtain the excellent processed surface gloss.

  The reason why the shape of the overhanging blade portions 31 and 33 is limited to the above range will be described. When the length L of the overhanging blade portions 31 and 33 exceeds 500 μm, there are many cases where the above-mentioned effect obtained by forming the overhanging blade portions 31 and 33 cannot be exhibited in many cutting applications. The length L exceeding 500 μm is simply because the inscribed circle of the blade tip replaceable tip 1 is in the same state. Therefore, the length L of the overhanging blade portions 31 and 33 is preferably changed according to the cutting application (cutting conditions). However, if the length L is 500 μm or less, preferably 300 μm or less, and more preferably 200 μm or less, a number of cuttings can be performed. The effects of the overhanging blade portions 31 and 33 are exhibited in the application. On the other hand, in order to exhibit the effect of the overhanging blade portions 31 and 33, the length L is preferably 5 μm or more.

  When the height H of the overhanging blade portions 31 and 33 exceeds 200 μm, the cutting resistance is increased, the work material is welded to the blade tip replaceable tip 1, the chip disposal property of the blade tip replaceable tip 1 is deteriorated, and In some cases, the protruding blade portions 31 and 33 may be damaged. In order to avoid the occurrence of these problems, the height H of the overhanging blade portions 31 and 33 is set to 200 μm or less, preferably 50 μm or less, and more preferably 30 μm or less. On the other hand, in order to exhibit the effect of the overhanging blade portions 31 and 33, the height H is preferably 2 μm or more.

  When the planar shape of the overhanging blade portions 31 and 33 is an arc, the effect of providing the overhanging blade portions 31 and 33 is small unless the radius of curvature R is 100 μm or more. The radius of curvature R is preferably 200 μm, more preferably 300 μm or more. On the other hand, in order to exhibit the effect of the overhanging blade portions 31 and 33, it is preferable that the radius of curvature R is 30000 μm or less.

  The shape of the overhanging blade portions 31 and 33 can be measured by any measurement method. For example, a general-purpose stylus-type contour measuring machine may be used, a non-contact contour measuring machine using a laser may be used, or photography is performed after embedding the cut surface. And may be measured.

  FIG. 4 is a diagram showing a second example in which the vicinity of regions III and IV in FIG. 2 is enlarged. The overhanging blade portion 31 shown in FIG. 4 is provided between the straight blade portion 11 and the curved blade portion 21, and protrudes toward the outside of the polygon with respect to the straight blade portion 11. It forms so that it may protrude toward the outer side of a polygon also with respect to the shaped blade part 21. FIG. The overhanging blade portion 33 is provided between the linear blade portion 12 and the curved blade portion 21, and protrudes toward the outside of the polygon with respect to the straight blade portion 12, and the curved blade portion 21. Is formed so as to protrude toward the outside of the polygon. Unlike the first example shown in FIG. 3, the maximum overhang portions 32 and 34 of the overhang blade portions 31 and 33 are not connected to the curved blade portion 21, and the maximum overhang portions 32 and 34 are not connected to the curved blade portion 21. On the other hand, it protrudes outward in the planar shape of the blade-tip-exchangeable tip 1.

  Even when the protruding blade portions 31 and 33 are formed in the shape shown in FIG. 4, as described with reference to FIG. 3, the advantages and the curvature of the blade-tip-exchangeable tip 1 having the curved blade portion 21 having a small curvature radius are obtained. It is possible to provide a blade-tip replaceable tip 1 that has the advantages of the blade-tip replaceable tip 1 having the curved blade portion 21 having a large radius and can obtain an excellent processed surface gloss. The length L, height H, and radius of curvature R of the overhanging blade portions 31 and 33 can be arbitrarily set within the same range as the first example shown in FIG.

FIG. 5 is an enlarged cross-sectional view of the blade-tip replaceable tip 1 according to the first embodiment. FIG. 5 shows an enlarged view of the cross section of the blade-tip replaceable tip 1 along a plane perpendicular to both the rake face 2 and the flank face 4 shown in FIG. A straight blade 11 shown in FIGS. 1 to 4 is formed on the ridge 6 formed at the intersection where the rake face 2 and the flank 4 intersect. As shown in FIG. 5, the horizontal line serving as a reference at the time of cutting and the rake face 2 form a rake angle θ ₁ . The vertical line and a flank 4, to form a clearance angle theta _2. The rake face 2 and the flank face 4 form a wedge angle θ ₃ .

As shown in FIG. 5, the cutting edge replaceable tip 1 of Embodiment 1 has a rake angle θ _{1 that} is negative, and the rake face 4 intersects the rake face 2 at an angle of 90 ° or more. ₃ is a negative chip formed so that ₃ is 90 ° or more. In the negative type blade-tip-exchangeable tip 1, the upper and lower surfaces, that is, the rake surface 2 and the lower surface facing the rake surface 2 are parallel surfaces having the same shape. Therefore, each of the ridge lines 6 formed at the intersection between the upper and lower surfaces and the side surface can be used as a cutting edge, and thus the negative type blade edge replaceable tip 1 is excellent in economy. In addition, the blade edge strength is excellent.

  FIG. 6 is a view showing a first example in which the vicinity of the overhanging blade portion 31 of the blade tip replaceable tip 1 is enlarged. FIG. 7 is a cross-sectional view of the blade-tip replaceable tip 1 along the line VII-VII shown in FIG. As shown in FIGS. 6 and 7, the overhanging blade portion 31 extends from the ridge line 6 where the rake face 2 and the flank 4 intersect to the flank 4 in the thickness direction (vertical direction). It is formed so as to extend. The distance D shown in FIG. 7 where the overhanging blade 31 extends on the flank 4 is 0.2 mm or more from the rake face 2. A protruding blade portion 31 is formed on the flank 4 at least in the range of 0.2 mm or more from the rake face 2. The overhang blade 31 is formed over the flank 4 within a range of 0.2 mm or more from the ridgeline 6 where the rake face 2 and the flank 4 intersect.

  FIG. 8 is a view showing a second example in which the vicinity of the overhanging blade portion 31 of the blade tip replaceable tip 1 is enlarged. FIG. 9 is a cross-sectional view of the blade-tip replaceable tip 1 along the line IX-IX shown in FIG. As shown in FIGS. 8 and 9, the overhanging blade portion 31 extends from the ridge line 6 where the rake face 2 and the flank face 4 intersect to the flank face 4 in the thickness direction (vertical direction). It is formed so as to extend. As shown in FIG. 9, the overhanging blade portion 31 extends from the ridge line 6 where the rake face 2 and the flank 4 intersect to the flank 4 and is formed over the entire flank 4. An overhanging blade portion 31 is formed on the entire flank 4 in the thickness direction (vertical direction) of the blade-tip replaceable tip 1.

  Although the overhanging blade portion 31 has been described as an example in FIGS. 6 to 9, the overhanging blade portion 33 between the linear blade portion 12 and the curved blade portion 21 may be formed in the same shape as the overhanging blade portion 31. Good. If the overhanging blade portions 31 and 33 are not formed on the flank surfaces 4 and 5 with a length of 0.2 mm or more, the effect of improving the surface roughness and surface gloss described above becomes small. The distance D over which the overhanging blade portions 31 and 33 extend to the flank surfaces 4 and 5 is preferably 0.5 mm or more, more preferably 1 mm or more, and protrudes from the flank surfaces 4 and 5 over the entire flank surfaces 4 and 5. The overhanging blade portions 31 and 33 may be formed as described above.

  The cutting edge replaceable tip 1 of the first embodiment described above includes a WC-based cemented carbide, cermet, high speed steel, ceramics, cubic boron nitride sintered body, diamond sintered body, silicon nitride sintered body, oxidation You may form from either the base material which consists of aluminum and titanium carbide. You may perform the blade edge | tip process using a brush, a barrel, blast, a diamond grindstone, etc. with respect to these base materials. A surface coating layer by PVD (Physical Vapor Deposition) method or CVD (Chemical Vapor Deposition) method may be formed on the surface of these substrates. After the surface coating layer is formed, a brush, barrel Surface treatment using blasting or the like may be performed.

  The cemented carbide is a solid solution phase consisting of 1) tungsten carbide, 2) transition metal IVa, Va, IVa group transition metal having a B-1 type crystal structure and carbon, nitrogen, oxygen or boron: 0.01 to 50 3) A binder phase composed of at least one iron-based metal: 0.1 to 3.0% by weight, and 4) inevitable impurities: the balance. However, 2) is not essential, and the cemented carbide may include the above 1), 3) and 4). 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 iron-based metal or a de-β layer.

  Cermet is 1) a solid solution phase consisting of a transition metal IVa, Va, IVa group transition metal having a B-1 type crystal structure and carbon, nitrogen, oxygen or boron: 0.1 to 95% by weight, and 2) iron-based It is defined as including a binder phase composed of one or more metals: 0.1 to 40% by weight, and 3) inevitable impurities: the balance. The transition metal IVa, Va, IVa group transition metal of 1) is mainly composed of Ti. The surface portion of the cermet may include a surface hardened layer, a softened layer, or a layer mainly composed of an iron-based metal.

  The blade tip replaceable tip 1 of the present embodiment is used, for example, for drills, end mills, milling blade tip replaceable tips, turning blade tip replaceable tips, metal saws, gear cutting tools, reamers, taps, or pin milling tips. It may be. Among these applications, the most effective one can be a cutting edge exchangeable tip for turning used with a single blade. A more economical effect can be expected by using a blade type replaceable tip 1 of a negative type having a plurality of cutting edges.

  If the overhanging blade portions 31 and 33 are formed at the time of press molding and are not polished, it is desirable because they are excellent in productivity, economy, and high degree of freedom in shape. As described above, blade edge treatment or surface treatment using a brush, barrel, blast, diamond grindstone, or the like may be performed on the unpolished projecting blade portions 31 and 33. The upper surface (rake surface) or the tool restraint surface may be polished.

(Embodiment 2)
FIG. 10 is a perspective view showing an external appearance of the blade-tip replaceable tip 1 according to the second embodiment. As with the first embodiment, the blade-tip-exchangeable tip 1 according to the second embodiment is a negative tip that does not have left and right sides. The blade tip replaceable tip 1 according to the second embodiment is different from the first embodiment in that the chip breaker 9 is not formed on the rake face 2. The blade tip replaceable tip 1 shown in FIG. 10 may be fixed to the tool by brazing, or may be fixed to the tool by forming a mounting hole and using a fastening member.

  Also in the blade-tip replaceable tip 1 of the second embodiment having such a configuration, the straight blade portion 11 is interposed between the straight blade portion 11 and the curved blade portion 21 as in the first embodiment. A protruding blade portion 31 that protrudes toward the outside of the polygon is provided, and a protruding blade that protrudes toward the outside of the polygon with respect to the linear blade portion 12 between the linear blade portion 12 and the curved blade portion 21. A portion 33 can be provided. If it does in this way, the effect which can improve the surface roughness and surface gloss of a work material can be acquired similarly.

(Embodiment 3)
FIG. 11 is a perspective view showing an external appearance of the blade-tip replaceable tip 1 according to the third embodiment. FIG. 12 is an enlarged cross-sectional view of the blade-tip replaceable tip 1 according to the third embodiment. As shown in FIGS. 11 and 12, the blade tip replaceable tip 1 according to the third embodiment has a positive rake angle θ ₁ , flank surfaces 4 and 5 form an acute angle with respect to the rake surface 2, and It is a positive chip formed so as to intersect with the lower surface facing the rake face 2 at an obtuse angle so that the rust angle θ ₃ is an acute angle. The positive-type blade-tip-exchangeable tip 1 has advantages in that the cutting edge strength is low and the number of corners used for the cutting blade is reduced compared to the negative type, but the sharpness is good and the cutting resistance is reduced.

  The blade-tip-exchangeable tip 1 shown in FIG. The blade-tip replaceable tip 1 may be fixed to the tool by brazing, or may be fixed to the tool by forming a mounting hole and using a fastening member. Although not clearly shown in FIG. 11, a chip breaker 9 is formed on the rake face 2 in order to sever the chips of the work material as in the first embodiment. Or, like the second embodiment, the chip breaker may not be formed on the rake face 2.

  In the blade-tip replaceable tip 1 of the third embodiment having such a configuration, the straight blade portion 11 is interposed between the straight blade portion 11 and the curved blade portion 21 as in the first embodiment. A protruding blade portion 31 that protrudes toward the outside of the polygon is provided, and a protruding blade that protrudes toward the outside of the polygon with respect to the linear blade portion 12 between the linear blade portion 12 and the curved blade portion 21. A portion 33 can be provided. If it does in this way, the effect which can improve the surface roughness and surface gloss of a work material can be acquired similarly.

(Embodiment 4)
In the description of the first to third embodiments, the blade tip replaceable tip 1 has no right and left sides, and the overhanging blade portions 31 and 33 are provided at both joints between the straight blade portions 11 and 12 and the curved blade portion 21. An example in which is formed has been described. In the case of the blade-tip-exchangeable tip 1 that does not have the right and left sides, it is desirable to provide the protruding blade portions 31 and 33 at any joint between the straight blade portions 11 and 12 and the curved blade portion 21 on the left and right sides.

  However, the blade tip replaceable tip 1 of the present invention is not limited to such a configuration. The blade-tip-exchangeable tip 1 is used by being attached to a certain tool, but when the blade-tip-replaceable tip 1 for turning is used by being attached to a cutting tool, there is no choice in the feed direction of the cutting tool. Further, when the blade-tip-exchangeable tip 1 for milling is used with being attached to a cutter, there is no choice in the direction of rotation (clockwise and counterclockwise). When the tool that holds the blade-tip-exchangeable tip 1 is selfish, it is more preferable to use the blade-tip-exchangeable tip 1 having the right hand for the tool.

  FIG. 13 is a plan view of the tool 50 to which the cutting edge-replaceable tip 1 according to the fourth embodiment is fixed. FIG. 14 is a front view of the tool 50 shown in FIG. FIG. 15 is a side view of the tool 50 viewed from the direction of the arrow XV shown in FIG. FIG. 16 is a side view of the tool 50 as viewed from the direction of the arrow XVI shown in FIG. As shown in FIGS. 13 and 14, the blade-tip-exchangeable tip 1 is fixed to the tip of a body 51 that forms the main body of the tool 50. On the other end side of the body 51, a shank 52 that forms a handle portion for fixing the tool 50 to a holder (not shown) is provided. In FIG. 13, the feed direction in which the tool 50 moves relative to the work material during cutting is indicated by a white arrow. On the side surface of the tool 50 shown in FIG. 15, the flank 4 and the linear blade portion 11 formed on the ridge line where the rake face 2 and the flank 4 intersect are illustrated. In the side surface of the tool 50 shown in FIG. 16, the flank 5 and the linear blade portion 12 formed on the ridge line where the rake face 2 and the flank 5 intersect are illustrated.

  FIG. 17 is a schematic diagram showing the arrangement of the blade tip replaceable tip 1 and the work material 100 when the surface of the work material 100 is cut. In FIG. 17, for the sake of simplicity, only the workpiece 100 and the blade-tip replaceable tip 1 are shown, and the tool 50 to which the blade-tip replaceable tip 1 is fixed and the holder that holds the tool 50 are shown. Not.

  As shown in FIG. 17, the work material 100 is rotated around a rotation shaft 101 by a rotation device (not shown). The blade tip replaceable tip 1 is fixed to the surface of the rotating workpiece 100 while the blade tip replaceable tip 1 is brought into contact with the surface of the rotating work material 100 with the straight blade portion 11 as the main cutting edge and the straight blade portion 12 as the front cutting edge. The work material 100 is cut by moving the tool 50 in the direction of the white arrow shown in FIG. The feed direction in which the blade tip replaceable tip 1 moves relative to the work material 100 along the rotation axis 101 is set in the direction of the white arrow shown in FIG. Does not move in the direction. The blade-tip-exchangeable tip 1 that moves in the direction of the white arrow in FIG. 17 with respect to the work material 100 is referred to as a right hand.

  FIG. 18 is a diagram illustrating a first example in which the blade-tip replaceable tip 1 according to the fourth embodiment is enlarged. In the case of the blade-tip-exchangeable tip 1 that is limited to the right-hand use only, it is not necessary to form a protruding blade portion at both the joints between the straight blade portions 11 and 12 and the curved blade portion 21. The overhanging blade portion on the main cutting edge side that forms the overhang on the main cutting edge side does not contribute to the improvement of the processed surface roughness and the processed surface gloss, which are the effects of the present invention. In addition, the presence of the overhanging blade portion on the main cutting edge side may cause an increase in cutting resistance during cutting and deterioration of chip disposal. In view of these, it is desirable to form the overhanging blade portion only on the front cutting edge side.

  Specifically, as illustrated in FIG. 18, a protruding blade portion 33 is provided between the linear blade portion 12 that forms the front cutting edge and the curved blade portion 21. The curved blade portion 21 is connected to the maximum projecting portion 34 of the projecting blade portion 33 that projects most greatly toward the outside of the polygon with respect to the linear blade portion 11. On the other hand, the linear blade part 11 which forms the main cutting edge, and the curved blade part 21 are directly connected without interposing a protruding blade part therebetween. In this way, the effect of improving the surface roughness and surface gloss of the processed surface of the work material can be obtained without deteriorating the cutting resistance and chip disposal during cutting.

  FIG. 19 is a diagram illustrating a second example in which the blade-tip replaceable tip 1 according to the fourth embodiment is enlarged. In the example shown in FIG. 19, a protruding blade portion 33 is provided between the linear blade portion 12 that forms the front cutting edge and the curved blade portion 21. The overhanging blade portion 33 is formed so as to protrude toward the outside of the polygon with respect to the linear blade portion 12 and to protrude toward the outside of the polygon with respect to the curved blade portion 21. . On the other hand, the linear blade part 11 which forms the main cutting edge, and the curved blade part 21 are directly connected without interposing a protruding blade part therebetween. In the example shown in FIG. 19 as well, as in the example shown in FIG. 18, the surface roughness and surface gloss of the work surface of the work material are improved without deteriorating the cutting resistance and chip disposal at the time of cutting. An effect can be obtained.

(Embodiment 5)
FIG. 20 is a plan view of the tool 50 to which the cutting edge-replaceable tip 1 according to the fifth embodiment is fixed. The blade-tip-exchangeable tip 1 according to the fifth embodiment is fixed to the distal end portion of the body 51 that forms the main body portion of the tool 50 as in the fourth embodiment. On the other end side of the body 51, a shank 52 that forms a handle portion for fixing the tool 50 to a holder (not shown) is provided. In FIG. 20, the feed direction in which the tool 50 moves relative to the work material during cutting is indicated by a white arrow. The feed direction in which the blade-tip replaceable tip 1 moves relatively along the axial direction with respect to the work material 100 at the time of cutting is set in the direction of the white arrow shown in FIG. 1 does not move in the reverse direction. The blade-tip-exchangeable tip 1 that moves in the direction of the white arrow in FIG. 20 is referred to as a left hand.

  In the case of the blade-tip-exchangeable tip 1 limited only to the left-handed use, as described in the fourth embodiment, overhanging blade portions are provided at both joints between the straight blade portions 11 and 12 and the curved blade portion 21. It is not necessary to form, and it is desirable to form the overhanging blade portion only on the front cutting edge side. In the left-handed blade-tip-exchangeable tip 1 shown in FIG. 20, the linear blade portion 12 is used as the main cutting edge and the straight blade portion 11 is used as the front cutting edge when the workpiece is cut.

  FIG. 21 is a diagram illustrating a first example in which the blade-tip replaceable tip 1 according to the fifth embodiment is enlarged. In the example shown in FIG. 21, a protruding blade portion 31 is provided between the linear blade portion 11 that forms the front cutting edge and the curved blade portion 21. The curved blade portion 21 is connected to the maximum projecting portion 34 of the projecting blade portion 33 that projects most greatly toward the outside of the polygon with respect to the linear blade portion 11. On the other hand, the linear blade part 12 which forms the main cutting edge, and the curved blade part 21 are directly connected without interposing an overhanging blade part therebetween. The straight blade portion 12 is directly connected to the curved blade portion 21. In this way, the effect of improving the surface roughness and surface gloss of the processed surface of the work material can be obtained without deteriorating the cutting resistance and chip disposal during cutting.

  FIG. 22 is a diagram showing a second example in which the blade-tip replaceable tip 1 according to the fifth embodiment is enlarged. In the example shown in FIG. 22, the overhanging blade portion 33 is provided between the linear blade portion 11 that forms the front cutting edge and the curved blade portion 21. The overhanging blade portion 33 is formed so as to protrude toward the outside of the polygon with respect to the linear blade portion 11 and to protrude toward the outside of the polygon with respect to the curved blade portion 21. . On the other hand, the linear blade part 12 which forms the main cutting edge, and the curved blade part 21 are directly connected without interposing an overhanging blade part therebetween. In the example shown in FIG. 22 as well, as in the example shown in FIG. 21, the surface roughness and surface gloss of the work surface of the work material are improved without deteriorating the cutting resistance and chip disposal at the time of cutting. An effect can be obtained.

Embodiment 1 of the present invention will be described below.
(sample)
The raw material powder blended in the composition of WC-TiC (2.0 wt%)-TaC (2.0 wt%)-NbC (1.0 wt%)-Co (6.5 wt%) was pulverized and mixed with a ball mill. After press molding, sintering was performed at 1450 ° C. for 1 hour. After that, the upper and lower surfaces are ground with a diamond grindstone, subjected to a cutting edge treatment by honing of 0.06 mm as viewed from the rake face with an SiC brush, and then TiN (0.3 μm) / MT-TiCN (4 .1 μm) / TiBN (0.7 μm) / κ-Al ₂ O ₃ (1.4 μm) / TiN (0.4 μm) coating layer, and SUMITOMO ELECTRIC HARDMETAL CO., LTD. CNMG120408N-GU carbide An alloy blade tip replaceable tip was prepared. The flank shape was individually indicated, and the flank surface was not polished all around. The overhanging blade portion (denoted as a convex portion in the table below) was formed on both the main cutting edge and the front cutting edge using a predetermined die (mortar) during press molding. A stylus type contour shape measuring machine (CV-4000H made by Mitutoyo, radius of stylus needle tip 25 μm, with needle tip correction) was used as a measuring instrument to measure the shape. Table 1 shows the shape of the overhanging blade portion of the prepared blade tip replacement tip of Example 1. Convex projecting blade portions of the same shape were formed at the joints between both the straight blade portions and the curved blade portions.

(Evaluation)
The inventive products 1A to 1H and comparative products 1I to 1L shown in Table 1 were subjected to cutting evaluation under the following conditions to evaluate the processed surface roughness and the processed surface gloss.

Work material: SCM415 φ250 round bar, turning outer diameter Use holder: PCLNR2525-43 (Sumitomo Electric Hardmetal Co., Ltd.)
Cutting speed: 120 m / min
Feed: 0.15 mm / rev.
Cutting depth: 1.5mm
Cutting time: 1 minute Cutting oil: water-soluble oil Table 2 shows the evaluation results. The machined surface roughness was evaluated by an arithmetic average roughness Ra based on JIS B 0601. The processed surface gloss was evaluated by visually observing the surface of the work material after processing.

  From Table 2, the machined surface processed using the blade-tip replaceable tips of the inventive products 1A to 1H is compared with the processed surface using the blade-tip replaceable tips of the comparative products 1I to 1L. Was getting smaller. In the comparative product 1K, there was a problem that the work material was welded to the blade tip type insert, but in the products 1A to 1H of the present invention, such a problem did not occur. In addition, while the processed surfaces using the comparative products 1I to 1L were cloudy, the processed surfaces using the inventive products 1A to 1H showed gloss. That is, it was confirmed that both the surface roughness and the surface gloss were improved on the processed surface processed using the cutting edge-exchangeable tip of the present invention.

Embodiment 2 of the present invention will be described below.
(sample)
The raw material powder blended in the composition of WC—Cr ₃ C ₂ (0.3 wt%)-Co (10.0 wt%) was pulverized and mixed with a ball mill, pressed, and then sintered at 1400 ° C. for 1 hour. . After that, the upper and lower surfaces are ground with a diamond grindstone and subjected to a cutting edge treatment with a honing of 0.05 mm as viewed from the rake face with a SiC brush, and then TiN (1.0 μm) / TiAlN (3.0 μm) using a known PVD method. ) / TiCN (0.2 μm) coating layer was formed, and a cemented carbide tip replacement type chip of model number CNMA120408 defined in JIS B4120-1998 was prepared. The flank face was not polished all around. The overhanging blade portion (denoted as a convex portion in the table below) was formed on both the main cutting edge and the front cutting edge using a predetermined die (mortar) during press molding. Using a laser-type non-contact three-dimensional shape measuring machine (Keyence Corporation KS-1100) as a measuring instrument, the laser beam was incident from the upper surface, scanned, and the shape of the flank was measured to measure the shape. Table 3 shows the shape of the overhanging blade portion of the prepared blade tip replacement tip of Example 2. Convex projecting blade portions of the same shape were formed at the joints between both the straight blade portions and the curved blade portions.

(Evaluation)
The inventive products 2A to 2H and comparative products 2I to 2L shown in Table 3 were subjected to cutting evaluation under the following conditions to evaluate the processed surface roughness and the processed surface gloss.

Work material: S15C φ200 round bar (with slit), turning outer diameter Use holder: PCLNR2525-43 (manufactured by Sumitomo Electric Hardmetal Co., Ltd.)
Cutting speed: 100 m / min
Feed: 0.10 mm / rev.
Cutting depth: 0.5mm
Cutting time: 2 minutes Cutting oil: None Table 4 shows the evaluation results. The machined surface roughness was evaluated by an arithmetic average roughness Ra based on JIS B 0601. The processed surface gloss was evaluated by visually observing the surface of the work material after processing.

  From Table 4, the processed surface processed using the cutting edge replaceable tip of the present invention products 2A to 2H is compared with the processed surface using the cutting edge replaceable tip of the comparative products 2I to 2L, as compared to the processed surface roughness. Was getting smaller. In the comparative product 2K, the problem that the work material was welded to the blade-tip-exchangeable tip occurred, but in the products 2A to 2H of the present invention, such a problem did not occur. Moreover, while the processed surface using the comparative products 2I to 2L was cloudy, the processed surface using the inventive products 2A to 2H showed gloss. That is, it was confirmed that both the surface roughness and the surface gloss were improved on the processed surface processed using the cutting edge-exchangeable tip of the present invention.

Embodiment 3 of the present invention will be described below.
(sample)
Sumitomo Electric Hardmetal Co., Ltd. T1200A TNMG160408N-SU, which is a cermet tip replacement type tip, was prepared. The flank shape was individually indicated, and the flank surface was not polished all around. The overhanging blade portion (denoted as a convex portion in the table below) was formed on both the main cutting edge and the front cutting edge using a predetermined die (mortar) during press molding. The shape was measured by embedding and wrapping the cut surface at a point 0.5 mm below the plane parallel to the rake face. Table 5 shows the shape of the overhanging blade portion of the prepared cutting edge-exchangeable tip of Example 3.

(Evaluation)
The inventive products 3A and 3B shown in Table 5 and the comparative product 3C were subjected to cutting evaluation under the following conditions to evaluate the processed surface roughness and the processed surface gloss.

Work material: SCr420H φ250 round bar, turning outer diameter Use holder: PTGNR2525-33 (manufactured by Sumitomo Electric Hardmetal Co., Ltd.)
Cutting speed: 120 m / min
Feed: 0.08 mm / rev.
Cutting depth: 0.6mm
Cutting time: 1 minute Cutting oil: water-soluble oil Table 6 shows the results of the evaluation. The machined surface roughness was evaluated by an arithmetic average roughness Ra based on JIS B 0601. The processed surface gloss was evaluated by visually observing the surface of the work material after processing.

  From Table 6, the machined surface processed using the blade tip replaceable tip of the products 3A and 3B of the present invention has a smaller processed surface roughness than the processed surface using the blade tip replaceable tip of the comparative product 3C. It was. The processed surface using the comparative product 3C was cloudy, whereas the processed surface using the products 3A and 3B of the present invention showed gloss. That is, it was confirmed that both the surface roughness and the surface gloss were improved on the processed surface processed using the cutting edge-exchangeable tip of the present invention.

Embodiment 4 of the present invention will be described below.
(sample)
Sumitomo Electric Hardmetal Co., Ltd. T1200A TPGG110304L-SD, which is a cermet tip replacement type tip, was prepared. The flank shape was individually indicated, and the rake face and flank face were polished. The overhanging blade portion (denoted as a convex portion in the table below) was formed using a diamond grindstone during side polishing. The blade-tip-exchangeable tip of Example 4 was a free-standing tip, and the convex overhanging blade portion was formed only on the flank with the front cutting edge, and not on the flank with the main cutting blade. The shape measuring method was the same as in Example 1. Table 7 shows the shape of the overhanging blade portion of the prepared cutting edge-exchangeable tip of Example 4.

(Evaluation)
The inventive products 4A and 4B shown in Table 7 and the comparative product 4C were subjected to cutting evaluation under the following conditions to evaluate the processed surface roughness and the processed surface gloss.

Work material: STKM13A, outer diameter φ40, inner diameter φ30, L: 30 pipe material, turning inner diameter Use holder: BBPT-216R18 (manufactured by Sumitomo Electric Hardmetal Co., Ltd.)
Cutting speed: 80 m / min
Feed: 0.05 mm / rev.
Cutting depth: 0.3mm
Cutting time: 1 minute Cutting oil: water-soluble oil Table 8 shows the results of the evaluation. The machined surface roughness was evaluated by an arithmetic average roughness Ra based on JIS B 0601. The processed surface gloss was evaluated by visually observing the surface of the work material after processing.

  From Table 8, the machined surface processed using the cutting edge replaceable tip of the products 4A and 4B of the present invention has a small processed surface roughness compared to the processed surface using the cutting edge replaceable tip of the comparative product 4C. It was. The processed surface using the comparative product 4C was cloudy, whereas the processed surface using the inventive products 4A and 4B showed gloss. That is, it was confirmed that both the surface roughness and the surface gloss were improved on the processed surface processed using the cutting edge-exchangeable tip of the present invention.

Embodiment 5 of the present invention will be described below.
(sample)
A cutting edge exchangeable tip BN250 2NU-CNGA120404 of Sumitomo Electric Hardmetal Co., Ltd., which is a tool brazed with a sintered body mainly composed of cubic silicon nitride, was prepared. The flank shape was individually indicated, and the flank surface was polished around. The overhanging blade portion (denoted as a convex portion in the table below) was formed on both the main cutting edge and the front cutting edge during side polishing with a diamond grindstone. The shape measuring method was the same as in Example 2. Table 9 shows the shape of the overhanging blade portion of the prepared blade tip replacement tip of Example 5.

(Evaluation)
The inventive products 5A and 5B shown in Table 9 and the comparative product 5C were subjected to cutting evaluation under the following conditions to evaluate the processed surface roughness and the processed surface gloss.

Work material: SCM415 carburizing and quenching material (HRC62), φ220 round bar, turning outer diameter Use holder: PCLNR2525-43 (manufactured by Sumitomo Electric Hardmetal Co., Ltd.)
Cutting speed: 100 m / min
Feed: 0.04 mm / rev.
Cutting depth: 0.05mm
Cutting time: 1 minute Cutting oil: water-soluble oil Table 10 shows the results of the evaluation. The machined surface roughness was evaluated by an arithmetic average roughness Ra based on JIS B 0601. The processed surface gloss was evaluated by visually observing the surface of the work material after processing.

  From Table 10, the machined surface processed using the cutting edge replaceable tip of the inventive products 5A and 5B has a smaller processed surface roughness than the processed surface using the cutting edge replaceable tip of the comparative product 5C. It was. Further, the processed surface using the comparative product 5C was cloudy, whereas the processed surface using the inventive products 5A and 5B showed gloss. That is, it was confirmed that both the surface roughness and the surface gloss were improved on the processed surface processed using the cutting edge-exchangeable tip of the present invention.

Embodiment 6 of the present invention will be described below.
(sample)
Sumitomo Electric Hardmetal Co., Ltd. ACK300 SPMN423, which is a cutting edge replaceable chip made of PVD coated cemented carbide for milling, was prepared. The flank shape was individually indicated, and the flank surface was not polished all around. The overhanging blade portion (denoted as a convex portion in the table below) was formed during press molding. The shape measuring method was the same as in Example 2. Table 11 shows the shape of the overhanging blade portion of the prepared cutting edge replacement tip of Example 6.

(Evaluation)
The inventive products 6A and 6B shown in Table 11 and the comparative product 6C were subjected to cutting evaluation under the following conditions to evaluate the processed surface roughness and the processed surface gloss.

Work material: SCM435 Block material (100x200)
Holder used: DPG4160R (manufactured by Sumitomo Electric Hardmetal Corp.)
Test method: Only one chip is attached to the cutter, and face milling is performed with a center cut. Cutting speed: 220 m / min
Feed: 0.3 mm / rev.
Cutting depth: 2.0mm
Cutting time: 1 minute Cutting oil: water-soluble oil Table 12 shows the results of the evaluation. The machined surface roughness was evaluated by an arithmetic average roughness Ra based on JIS B 0601. The processed surface gloss was evaluated by visually observing the surface of the work material after processing.

  From Table 12, the machined surface processed using the cutting edge replaceable tip of the products 6A and 6B of the present invention has a small processed surface roughness compared to the processed surface using the cutting edge replaceable tip of the comparative product 6C. It was. The processed surface using the comparative product 6C was cloudy, whereas the processed surface using the inventive products 6A and 6B showed gloss. That is, it was confirmed that both the surface roughness and the surface gloss were improved on the processed surface processed using the cutting edge-exchangeable tip of the present invention.

Embodiment 7 of the present invention will be described below.
(sample)
The raw material powder blended in the composition of WC-TiC (3.0 wt%)-TaC (1.2 wt%)-NbC (0.4 wt%)-Co (5.0 wt%) was pulverized and mixed with a ball mill. After press molding, sintering was performed at 1420 ° C. for 1 hour. Thereafter, the upper and lower surfaces are ground with a diamond grindstone, subjected to a blade edge treatment by 0.08 mm honing as viewed from the rake face by barrel treatment using SiC abrasive grains, and then TiN (0.3 μm using a known CVD method). ) / MT-TiCN (5.3μm) / TiBN (0.8μm) / α-Al 2 O 3 (3.4μm) / TiN ( to form a coating layer of 0.5 [mu] m), Sumitomo Electric Hardmetal Corp. A CNMG120408N-LU-shaped cemented carbide alloy tip replacement type tip was prepared. The flank shape was individually indicated, and the flank surface was not polished all around. The overhanging blade portion (denoted as a convex portion in the table below) was formed on both the main cutting edge and the front cutting edge using a predetermined die (mortar) during press molding. The shape measuring method was the same as in Example 1. Table 13 shows the shape of the overhanging blade portion of the prepared blade tip replaceable tip of Example 7. Convex projecting blade portions of the same shape were formed at the joints between both the straight blade portions and the curved blade portions.

(Evaluation)
The inventive products 7A to 7H and comparative products 7I to 7L shown in Table 13 were subjected to cutting evaluation under the following conditions to evaluate the processed surface roughness and the processed surface gloss.

Work material: S10C φ250 round bar, turning outer diameter Use holder: PCLNR2525-43 (Sumitomo Electric Hardmetal Co., Ltd.)
Cutting speed: 80 m / min
Feed: 0.14 mm / rev.
Cutting depth: 1.2mm
Cutting time: 1 minute Cutting oil: water-soluble oil Table 14 shows the results of the evaluation. The machined surface roughness was evaluated by an arithmetic average roughness Ra based on JIS B 0601. The processed surface gloss was evaluated by visually observing the surface of the work material after processing.

  From Table 14, the processed surface processed using the cutting edge replaceable tip of the inventive products 7A to 7H is compared with the processed surface using the cutting edge replaceable tip of the comparative products 7I to 7L, and the processed surface roughness Was getting smaller. In the comparative product 7K, there was a problem that the work material was welded to the blade tip type insert, but in the products 7A to 7H of the present invention, such a problem did not occur. In addition, while the processed surfaces using the comparative products 7I to 7L were cloudy, the processed surfaces using the inventive products 7A to 7H showed gloss. That is, it was confirmed that both the surface roughness and the surface gloss were improved on the processed surface processed using the cutting edge-exchangeable tip of the present invention.

The eighth embodiment of the present invention will be described below.
(sample)
The raw material powder blended in the composition of WC—TaC (2.0 wt%) — Cr ₃ C ₂ (0.2 wt%) — Co (9.0 wt%) was pulverized and mixed with a ball mill, and then press molded. Sintered at 1400 ° C for 1 hour. Thereafter, the upper and lower surfaces were ground with a diamond grindstone, subjected to a cutting edge treatment by 0.05 mm honing as viewed from the rake face with a SiC elastic grindstone, and then TiAlCrN and TiSiCrN were laminated with a thickness of 20 nm using a known PVD method. A coating layer of super multi-layer film (3.2 μm) / TiArCrCN (0.2 μm) was formed, and a cemented carbide cutting edge replaceable tip of model number CNMA120404 defined by JIS B4120-1998 was prepared. The flank face was not polished all around. The overhanging blade portion (denoted as a convex portion in the table below) was formed on both the main cutting edge and the front cutting edge using a predetermined die (mortar) during press molding. Using a laser-type non-contact three-dimensional shape measuring machine (Keyence Corporation KS-1100) as a measuring device, the laser beam was incident from the upper surface, scanned, and the shape of the entire flank was measured to measure the shape. . Table 15 shows the shape of the overhanging blade portion of the prepared blade tip of the eighth embodiment. Convex projecting blade portions of the same shape were formed at the joints between both the straight blade portions and the curved blade portions.

(Evaluation)
The inventive products 8A to 8H and comparative products 8I to 8L shown in Table 15 were subjected to cutting evaluation under the following conditions to evaluate the processed surface roughness and the processed surface gloss.

Work material: SCr420H φ200 round bar (with slit), turning outer diameter Use holder: PCLNR2525-43 (manufactured by Sumitomo Electric Hardmetal Co., Ltd.)
Cutting speed: 95m / min
Feed: 0.09 mm / rev.
Cutting depth: 0.7mm
Cutting time: 2 minutes Cutting oil: None Table 16 shows the evaluation results. The machined surface roughness was evaluated by an arithmetic average roughness Ra based on JIS B 0601. The processed surface gloss was evaluated by visually observing the surface of the work material after processing.

  From Table 16, the processed surface processed using the cutting edge replaceable tip of the products 8A to 8H of the present invention is processed surface roughness compared to the processed surface using the cutting edge replaceable tip of the comparative product 8I to 8L. Was getting smaller. In the comparative product 8K, there was a problem that the work material was welded to the blade tip type insert, but in the products 8A to 8H of the present invention, such a problem did not occur. Further, the processed surfaces using the comparative products 8I to 8L were cloudy, whereas the processed surfaces using the inventive products 8A to 8H showed gloss. That is, it was confirmed that both the surface roughness and the surface gloss were improved on the processed surface processed using the cutting edge-exchangeable tip of the present invention.

Embodiment 9 of the present invention will be described below.
(sample)
TaC (2.0 wt%) - NbC (4.0 wt%) _- Mo 2 C (8.0 wt%) - WC (14.0 wt%) - Co (7.5 wt%) - Ni (7 0.5% by weight) (remainder TiCN) was mixed with a raw material powder by a ball mill, press-molded, and sintered at 1480 ° C. for 1 hour. Thereafter, the upper and lower surfaces were ground with a diamond grindstone, and subjected to a cutting edge treatment by a honing of 0.06 mm as viewed from the rake face with a diamond brush to prepare a TNMG160408N-FL-shaped chip. The flank face was not polished all around. The overhanging blade portion (denoted as a convex portion in the table below) was formed on both the main cutting edge and the front cutting edge using a predetermined die (mortar) during press molding. The shape was measured by embedding and wrapping the cut surface at a point 0.5 mm below the plane parallel to the rake face. Table 17 shows the shape of the overhanging blade portion of the prepared blade tip replaceable tip of Example 9.

(Evaluation)
The inventive products 9A and 9B shown in Table 17 and the comparative product 9C were subjected to cutting evaluation under the following conditions to evaluate the processed surface roughness and the processed surface gloss.

Work material: STKM12A φ250 round bar, turning outer diameter Use holder: PTGNR2525-33 (manufactured by Sumitomo Electric Hardmetal Co., Ltd.)
Cutting speed: 115 m / min
Feed: 0.08 mm / rev.
Cutting depth: 0.5mm
Cutting time: 1 minute Cutting oil: water-soluble oil Table 18 shows the results of the evaluation. The machined surface roughness was evaluated by an arithmetic average roughness Ra based on JIS B 0601. The processed surface gloss was evaluated by visually observing the surface of the work material after processing.

  From Table 18, the machined surface processed using the cutting edge replaceable tip of the products 9A and 9B of the present invention has a smaller processed surface roughness than the processed surface using the cutting edge replaceable tip of the comparative product 9C. It was. The processed surface using the comparative product 9C was cloudy, whereas the processed surface using the products 9A and 9B of the present invention showed gloss. That is, it was confirmed that both the surface roughness and the surface gloss were improved on the processed surface processed using the cutting edge-exchangeable tip of the present invention.

The tenth embodiment of the present invention will be described below.
(sample)
Sumitomo Electric Hardmetal Co., Ltd. TPGG160404L-SD, which is a cermet cutting edge replaceable chip having the same composition as in Example 9, was prepared. The flank shape was individually indicated, and the rake face and flank face were polished. The overhanging blade portion (denoted as a convex portion in the table below) was formed using a diamond grindstone during side polishing. The blade-tip-exchangeable tip of Example 10 was a free-standing tip, and the convex overhanging blade portion was formed only on the flank with the front cutting edge, and not on the flank with the main cutting blade. The shape measuring method was the same as in Example 2. Table 19 shows the shape of the overhanging blade portion of the prepared blade tip replaceable tip of Example 4.

(Evaluation)
The inventive products 10A and 10B shown in Table 19 and the comparative product 10C were subjected to cutting evaluation under the following conditions to evaluate the processed surface roughness and the processed surface gloss.

Work material: STKM13A Pipe material with outer diameter φ40, inner diameter φ30, L: 30, turning inner diameter Use holder: BBPT-320R18 (manufactured by Sumitomo Electric Hardmetal Co., Ltd.)
Cutting speed: 70 m / min
Feed: 0.05 mm / rev.
Cutting depth: 0.5mm
Cutting time: 1 minute Cutting oil: water-soluble oil Table 20 shows the results of the evaluation. The machined surface roughness was evaluated by an arithmetic average roughness Ra based on JIS B 0601. The processed surface gloss was evaluated by visually observing the surface of the work material after processing.

  From Table 20, the machined surface processed using the cutting edge replaceable tip of the products 10A and 10B of the present invention has a smaller processed surface roughness than the processed surface using the cutting edge replaceable tip of the comparative product 10C. It was. The processed surface using the comparative product 10C was cloudy, whereas the processed surface using the products 10A and 10B of the present invention showed gloss. That is, it was confirmed that both the surface roughness and the surface gloss were improved on the processed surface processed using the cutting edge-exchangeable tip of the present invention.

Embodiment 11 of the present invention will be described below.
(sample)
A cutting edge replaceable chip BNC200 2NU-CNGA120404 of Sumitomo Electric Hardmetal Co., Ltd., which is a tool brazed with a sintered body mainly composed of cubic silicon nitride, was prepared. The flank shape was individually indicated, and the flank surface was polished around. The overhanging blade portion (denoted as a convex portion in the table below) was formed on both the main cutting edge and the front cutting edge during side polishing with a diamond grindstone. The shape measuring method was the same as in Example 1. Table 21 shows the shape of the overhanging blade portion of the prepared cutting edge-exchangeable tip of Example 11.

(Evaluation)
The inventive products 11A and 11B shown in Table 21 and the comparative product 11C were subjected to cutting evaluation under the following conditions to evaluate the processed surface roughness and the processed surface gloss.

Work material: SUJ2 (HRC63) φ220 round bar, turning outer diameter Use holder: PCLNR2525-43 (manufactured by Sumitomo Electric Hardmetal Co., Ltd.)
Cutting speed: 90 m / min
Feed: 0.03 mm / rev.
Cutting depth: 0.08mm
Cutting time: 0.5 minutes Cutting oil: water-soluble oil Table 22 shows the results of the evaluation. The machined surface roughness was evaluated by an arithmetic average roughness Ra based on JIS B 0601. The processed surface gloss was evaluated by visually observing the surface of the work material after processing.

  From Table 22, the machined surface processed using the cutting edge replaceable tip of the products 11A and 11B of the present invention has a smaller processed surface roughness than the processed surface using the cutting edge replaceable chip of the comparative product 11C. It was. The processed surface using the comparative product 11C was cloudy, whereas the processed surface using the products 11A and 11B of the present invention showed gloss. That is, it was confirmed that both the surface roughness and the surface gloss were improved on the processed surface processed using the cutting edge-exchangeable tip of the present invention.

The twelfth embodiment of the present invention will be described below.
(sample)
Sumitomo Electric Hardmetal Co., Ltd. ACK200 SPMN423, which is a cutting edge replaceable chip made of CVD coated cemented carbide for milling, was prepared. The flank shape was individually indicated, and the flank surface was not polished all around. The overhanging blade portion (denoted as a convex portion in the table below) was formed during press molding. The shape measuring method was the same as in Example 2. Table 23 shows the shape of the overhanging blade portion of the prepared blade tip replacement tip of Example 12.

(Evaluation)
The inventive products 12A and 12B and the comparative product 12C shown in Table 23 were subjected to cutting evaluation under the following conditions to evaluate the processed surface roughness and the processed surface gloss.

Work material: SCM435 block material (100x200)
Holder used: DPG4160R (manufactured by Sumitomo Electric Hardmetal Corp.)
Test method: Only one chip is attached to the cutter, and face milling is performed with a center cut. Cutting speed: 220 m / min
Feed: 0.3 mm / rev.
Cutting depth: 2.0mm
Cutting time: 1 minute Cutting oil: water-soluble oil Table 24 shows the results of the evaluation. The machined surface roughness was evaluated by an arithmetic average roughness Ra based on JIS B 0601. The processed surface gloss was evaluated by visually observing the surface of the work material after processing.

  From Table 24, the machined surface processed using the cutting edge replaceable tip of the products 12A and 12B of the present invention has a small processed surface roughness compared to the processed surface using the cutting edge replaceable tip of the comparative product 12C. It was. The processed surface using the comparative product 12C was cloudy, whereas the processed surface using the inventive products 12A and 12B showed gloss. That is, it was confirmed that both the surface roughness and the surface gloss were improved on the processed surface processed using the cutting edge-exchangeable tip of the present invention.

  Although the embodiments of the present invention have been described above, the configurations of the embodiments may be appropriately combined. In addition, it should be considered that the embodiments and examples disclosed this time are examples in all respects and are not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The cutting edge-replaceable tip of the present invention is for drilling, end milling, milling, turning, metal saw processing, gear cutting tool processing, reamer processing, tap processing and crankshaft pin milling processing. The present invention can be applied particularly advantageously to a cutting edge-exchangeable tip used for a cutting tool such as.

  1 Cutting edge replaceable tip, 2 rake face, 4, 5 flank face, 6 ridge line, 8 mounting hole, 9 chip breaker, 11, 12 straight blade part, 21, 22 curved blade part, 31, 33 overhang blade part 32, 34 Maximum overhang, 50 tools, 51 body, 52 shank, 100 work material, 101 axis of rotation.

Claims (13)

A cutting edge exchangeable tip having a substantially polygonal planar shape,
A linear blade provided at a position corresponding to a side of the polygon;
A curved blade provided at a position corresponding to the vertex of the polygon;
A blade-tip-exchangeable tip, which is provided between the linear blade portion and the curved blade portion, and includes a protruding blade portion that protrudes outward from the polygon with respect to the linear blade portion.   The blade tip replaceable tip according to claim 1, wherein a height at which the protruding blade portion protrudes from the linear blade portion is 2 µm or more and 200 µm or less.   The blade tip replaceable tip according to claim 1 or 2, wherein a length in which the protruding blade portion extends in a direction in which the linear blade portion extends is 5 µm or more and 500 µm or less. The overhanging blade portion has a maximum overhanging portion that protrudes largest toward the outside of the polygon with respect to the linear blade portion,
The blade edge-replaceable tip according to any one of claims 1 to 3, wherein the curved blade portion is connected to the maximum projecting portion.   4. The blade tip replaceable tip according to claim 1, wherein the protruding blade portion protrudes toward the outside of the polygon with respect to the curved blade portion. 5.   The blade tip replacement type tip according to any one of claims 1 to 5, wherein the protruding blade portion has a curved planar shape.   The cutting edge exchangeable tip according to claim 6, wherein a radius of curvature of the protruding blade portion is not less than 100 µm and not more than 30000 µm. Including a second linear blade portion provided at a position corresponding to a second side forming the vertex of the polygon formed with the curved blade portion together with the linear blade portion;
A second projecting blade portion provided between the second linear blade portion and the curved blade portion and projecting outward from the polygon with respect to the second linear blade portion; The blade-tip-exchangeable tip according to any one of claims 1 to 7. Including a second linear blade portion provided at a position corresponding to a second side forming the vertex of the polygon formed with the curved blade portion together with the linear blade portion;
The blade tip replaceable tip according to any one of claims 1 to 7, wherein the second linear blade portion is directly connected to the curved blade portion. It has a rake face that comes into contact with chips of the work material during cutting and a flank face that comes into contact with the work material,
The blade tip replaceable tip according to any one of claims 1 to 9, wherein the protruding blade portion is formed from a ridge line where the rake face and the flank face intersect to the flank face.   The blade tip replaceable tip according to claim 10, wherein the protruding blade portion is formed across the flank within a range of 0.2 mm or more from the ridgeline.   The blade tip replaceable tip according to claim 10 or 11, wherein the protruding blade portion is formed from the ridge line to the entire flank.   The blade edge replaceable tip according to any one of claims 1 to 12, wherein the blade edge replaceable tip is a negative tip.

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