JP5082422B2 - Cutting tools - Google Patents

Description

  The present invention relates to a cutting tool suitable for suppressing edge chipping.

  As a turning tool to suppress chipping, the corner angle of the deburring blade is negative and the cutting edge of the deburring blade has a small amount on the inner side of the cutter body. A deburring cutter that is arranged to be retracted and has a cutting edge protruding from the tip end in the axial direction of the cutter body with a deburring cutter having a corner angle in the range of -15 to -25 degrees, and a cutting blade The amount of protrusion of the cutting edge of the tip side of the deburring blade relative to the cutting edge of the cutter body toward the tip side in the axial direction of the cutter body is less than 0.05 mm.

By providing such a deburring blade, even if the burr at the end portion of the cutting surface generated by cutting with the cutting blade, that is, the portion left after cutting falls down in the moving direction of the cutter, the corner angle is negative and −20 Therefore, it is cut off by a deburring blade (for example, see Patent Document 1).
JP 2002-326113 A (FIG. 1 etc.)

  However, in the invention described in Patent Document 1, sufficient cutting edge strength cannot be ensured in a cutting process in which cast sand remains on a cast surface such as cast iron or a cutting variation such as a pouring gate or a cast burr occurs. There was a problem that the cutting edge was broken and the tool life was short.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a cutting tool that suppresses edge chipping and has a long tool life.

  In order to solve the above-described problems, the present invention provides a cutting tool in which a throw-away tip is mounted on a tool body, wherein the throw-away tip has a polygonal flat plate shape, and a rake face is formed on at least one polygonal surface. A flank is formed on the peripheral surface, and a cutting edge is formed at a crossing ridge line portion between the rake face and the flank, and the cutting edge extends at least in a direction substantially parallel to the feed direction of the cutting tool. A sub-blade that intersects the counter-cutting blade and extends forward in the feed direction of the counter-cutting blade; and a main cutting blade that intersects the sub-cutting blade and extends in the cutting direction of the cutting tool; The approach angle of the secondary cutting edge is set in the range of 75 ° to 88 °, and the rake angle in the secondary cutting edge is set in the range of −10 ° to 25 °. It is a cutting tool that features

  By setting the approach angle of the secondary cutting edge to 75 ° or more and 88 ° or less, the cutting thickness seen in the direction perpendicular to the secondary cutting edge is sufficiently reduced, and the cutting resistance acting on the cutting surface in contact with the secondary cutting edge is reduced. Therefore, the chipping at the end portion of the cutting surface is suppressed. Further, since the cutting resistance acting on the secondary cutting edge becomes small, the chipping of the secondary cutting edge is suppressed, and the deterioration of the tool life is prevented. Furthermore, since the rake angle at the secondary cutting edge is set in the range of −10 ° or more and 25 ° or less, the cutting resistance acting on the work surface in contact with the secondary cutting edge is further reduced. The effect of suppressing edge cracks is further increased.

  Hereinafter, a first embodiment of a face mill to which the present invention is applied will be described with reference to the drawings. FIG. 1 is a bottom view of the face mill. FIG. 2 is a partial longitudinal sectional view of the face mill shown in FIG. FIG. 3 is an enlarged side view of the cutting edge shape of the face mill shown in FIG. 4A and 4B are diagrams for explaining a throw-away tip mounted on the front face mill, wherein FIG. 4A is a plan view, FIG. 4B is a side view, and FIG. 4C is a cross section perpendicular to the cutting edge (line S1-S1). , S2-S2 line, S3-S3 line sectional view).

As shown in FIGS. 1 and 2, the face mill according to the first embodiment has a plurality of throw-away tips 20 along the circumferential direction at the tip outer periphery of a substantially disk-shaped tool body 10. Is mounted so as to protrude from the tip surface 10a and the outer peripheral surface 10b of the tool body 10.
Specifically, a plurality of mounting grooves 12 are provided along the circumferential direction in the outer peripheral portion of the tip of the tool body 10, and the chip support member 30 is fixed to these mounting grooves 12 using a screw member such as a bolt. Has been. Further, a chip pocket 14 and a wedge insertion groove 13 are provided adjacent to the tip support member 30 on the front side in the tool rotation direction K of each tip support member 30. A chip having a substantially square plate shape is provided on a chip seat 31 which is located in the region of the outer peripheral portion of the tip of the tool body 10 and is notched at the outer peripheral tip of the wall surface facing the front side of the tool rotation direction K of each tip support member 30. One square surface 20 is the rake face 22 is directed to the front side in the tool rotation direction K, and the other square surface is seated on the bottom surface 31a of the chip seat. By throwing the wedge member 40 inserted into the wedge insertion groove 13 and screwed into the tool main body 10 through a screw member such as a bolt into the inner side of the tool main body 10 by operating the screw member, a throw-away tip is inserted. 20 is detachably mounted on the tool body 10 by pressing the square surface toward the bottom surface 31a side of the chip seat. The tool body 10 is provided with an attachment surface 10c that abuts against a holding member such as an arbor or a spindle end surface of a machine tool on the end surface of the base end portion, and a milling hole 11 is formed along the center axis CL of the tool body. It has been drilled.

As shown in FIG. 4, in the throw-away tip 20 having a substantially square plate shape, one square surface is a rake surface 22, and a circumferential surface intersecting the rake surface 22 is a flank surface 23. A cutting edge is formed at the intersecting ridge line where the flank and the flank intersect. The ridgeline of each corner portion of the square surface that becomes the rake face 22 is formed adjacent to the wiping blade 21a and the auxiliary cutting edge 21b, and each side of the square surface connected to one end portion of the auxiliary cutting edge 21b has a main cutting edge. A blade 21c is formed. In this embodiment, the throw-away tip 20 is a so-called positive tip in which the angle formed by the rake face 22 and the flank face 23 intersecting each other with the wiping edge 21a, the auxiliary cutting edge 21b, and the main cutting edge 21c interposed therebetween is an acute angle. .
When the throw-away tip 20 is attached to the tool body 10, the square surface serving as the rake face 22 is directed to the front side in the tool rotation direction K, and the wiping blade 21 a protrudes from the tip surface 10 a of the tool body. It extends so as to be substantially orthogonal to the central axis CL of the tool body, and further, a secondary cutting edge 21b adjacent to the wiping blade 21a protrudes from the outer peripheral surface 10b of the tool body and extends toward the tool outer peripheral side and the tool base end side. So that it is arranged.

The approach angle Ψb of the sub cutting edge 21b is set in the range of 75 ° to 88 °, and the approach angle Ψc of the main cutting edge 21c extending from one end of the sub cutting edge 21b toward the tool base end side. Is not particularly limited as long as it is equal to or smaller than the approach angle Ψb of the auxiliary cutting edge 21b, but is set to about 25 ° in the present embodiment.
Further, the rake angle γp of the rake face 22 in the auxiliary cutting edge 21b is set in a range of more than −5 ° and not more than 25 °.

The face mill described above is rotated about the center axis CL of the tool body and is fed in a direction orthogonal to the center axis CL, whereby the surface of the work material is face milled. At the time of face milling, the end portion of the cutting surface is cut off from the work material and becomes a chip, and the strength of the periphery thereof is weakened, so that edge breakage is likely to occur.
In the face mill according to the present embodiment, the approach angle Ψb of the secondary cutting edge 21b is set in the range of 75 ° or more and 88 ° or less, so that the cutting thickness seen in the direction orthogonal to the secondary cutting edge 21b is sufficiently small. Since the cutting resistance acting on the cutting surface in contact with the auxiliary cutting edge 21b is reduced, the edge chipping at the end portion of the cutting surface is suppressed. Further, since the cutting resistance acting on the sub cutting edge 21b is also reduced, the sub cutting edge 21b is prevented from being lost, and the tool life is prevented from deteriorating. In this front milling machine, the same chip 20 provided with the auxiliary cutting edge 21b that is effective and high in suppressing edge chipping is mounted on all the chip seats 31, so that the effect of suppressing edge chipping and the effect of extending the tool life are extremely high. Become.

  The second embodiment according to the present invention will be described below with reference to the drawings. FIG. 5 is a partial longitudinal sectional view of a face mill according to the second embodiment. In FIG. 5, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 5, the face mill according to the second embodiment places a substantially square plate-shaped chip on a chip seat 31 formed on a chip support member 30, and uses the wedge member 40 to insert the chip 20 into a tool. The basic configuration of detachably fixing to the main body 10 is substantially the same as that of the face mill according to the first embodiment. In the chip 20 to be mounted, the basic configuration such as the rake face 22, the wiping edge 21a, the auxiliary cutting edge 21b, the main cutting edge 21c, and the flank face 23 is almost the same as the chip according to the first embodiment. The point which is what is called a negative chip in which the angle formed by the rake face 22 and the flank face 23 is substantially a right angle is different from the chip according to the first embodiment.

  As described above, in the present embodiment, since a negative tip is employed, in order to ensure a clearance (clearance) between the surface of the work material and the flank 23 connected to the secondary cutting edge 21b, the secondary cutting edge 21b is connected. The rake angle γp of the rake face 22 is negative and is preferably set in the range of −10 ° to −5 °. The approach angle Ψb of the auxiliary cutting edge 21b is set in the range of 75 ° to 88 °, as in the first embodiment. The approach angle Ψc of the main cutting edge 21c extending from one end of the sub cutting edge 21b toward the tool base end is not particularly limited as long as it is equal to or smaller than the approach angle Ψb of the sub cutting edge 21b. It is set to about 25 °.

  An example in which gray cast iron FC250 (JIS G 5501) is face milled using the face mills according to the first and second embodiments described above will be described with reference to the table. Each used face mill has a tool diameter of 125 mm and a number of blades (number of chips) of 10 blades. The cutting conditions are dry cutting without a cutting fluid, with a cutting speed Vc of 500 m / min, a cutting ap of 2.5 mm, a feed f per blade of 0.15 mm / blade. Table 1 shows the occurrence of edge chipping at the end portion of the cutting surface when the approach angle Ψb of the secondary cutting edge 21b and the rake angle γp of the secondary cutting edge 21b are variously changed. In Table 1, when the rake angle γp of the auxiliary cutting edge 21b is −5 ° or less, the face mill according to the second embodiment with a negative tip is used, and the rake angle γp is larger than −5 °. Used the face milling cutter according to the first embodiment equipped with a positive chip. In Table 1, the front milling cutters corresponding to the present invention are marked with an asterisk (*) in the entry column for the edge chipping occurrence state. The evaluation in Table 1 is a four-stage evaluation of ◎, ○, Δ, and ×, and the edge missing state corresponding to each evaluation is shown in FIG. As shown in FIG. 6, the evaluation ◎ is a state in which almost no edge chipping occurs, and the evaluation ◯ is a state in which minute edge chipping occurs slightly. These evaluations ◎ and ◯ are the appearance of the cutting surface It is judged that there is no adverse effect on quality and quality. On the other hand, the evaluation Δ is large in the size and occurrence frequency of the edge chipping. When the evaluation × is reached, the large edge chipping occurs in the entire area. These evaluations Δ and × are the cutting surface. It is judged that there is an adverse effect on the appearance and quality of the.

  As can be seen from Table 1, when the approach angle Ψb of the auxiliary cutting edge 21b is in the range of 75 ° to 88 ° and the rake angle γp of the auxiliary cutting edge 21b is in the range of −10 ° to 25 °, Evaluation is good with ◎ or ○. On the other hand, when the approach angle Ψb and the rake angle γp are out of the above ranges, the evaluation of edge chipping deteriorates to Δ or ×, resulting in poor appearance and quality of the cut surface.

In the first and second embodiments described above, for example, cast iron defined in JIS G 5501 of Japanese Industrial Standard (JIS), and aluminum alloys defined in JIS H 5202, JIS H 5302, etc. Thus, when cutting a work material having a hardness lower than that of carbon steel or alloy steel, if the ridgeline of the secondary cutting edge 21b is formed as a sharp edge without honing throughout the secondary cutting edge 21b, The sharpness of the blade 21b is improved, and the effect of suppressing edge chipping is further increased. Here, the sharp edge is a cross section perpendicular to the secondary cutting edge 21b, and the tip of the secondary cutting edge 21b is chamfered with a width of 0.02mm or less when viewed from a direction perpendicular to an arc shape or rake face having a radius of 0.02mm or less. A thing that makes a shape. Alternatively, depending on cutting conditions, when the wiping blade 21a, the auxiliary cutting edge 21b, or the main cutting edge 21c is chipped in the cutting of gray cast iron or aluminum alloy, the wiping edge 21a, the auxiliary cutting edge 21b, and the main cutting edge 21c. In addition to preventing chipping by forming the honing 24, the honing width W of the wiping edge 21a and the auxiliary cutting edge 21b is smaller than the honing width W of the main cutting edge 21c when viewed from the direction perpendicular to the rake face 22. It is desirable to suppress edge cracks.
On the other hand, when cutting carbon steel or alloy steel, it is desirable to form the honing 24 over the wiping blade 21a, the auxiliary cutting blade 21b, and the main cutting blade 21c in order to prevent chipping. Further, in consideration of suppressing occurrence of edge chipping due to chipping of the auxiliary cutting edge 21b, the honing width W of the auxiliary cutting edge 21b is larger than the honing width W of the wiping edge 21a when viewed from the direction perpendicular to the rake face 22. And it is desirable that it is equal to or larger than the honing width W of the main cutting edge 21c.
Alternatively, the honing width W of the main cutting edge 21c is desirably set wider than the honing width W of the wiping edge 21a and the auxiliary cutting edge 21b. This is because the honing cutting edge strengthening action extends the cutting edge life, and the honing width W of the wiping edge 21a and the auxiliary cutting edge 21b is made smaller than the honing width W of the main cutting edge, thereby reducing sharpness. This is intended to prevent as much as possible the reduction in the effect of suppressing edge cracks.

  Alternatively, in the first and second embodiments, when the honing 24 is formed over the wiping blade 21a, the auxiliary cutting blade 21b, and the main cutting blade 21c, with respect to the honing angle θ that is an angle formed by the rake face 22 and the honing face, When the honing angle θ of the sub cutting edge 21b is set larger than the honing angle θ of the wiping edge 21a, chipping is suppressed from occurring on the sub cutting edge 21b, so that the occurrence of chipping is suppressed. At this time, if the honing angle θ of the main cutting edge 21c is set larger than the honing angle θ of the auxiliary cutting edge 21b, the cutting edge life is extended by the cutting edge reinforcing action of the honing 24.

  Next, as a third embodiment, a byte to which the present invention is applied will be described with reference to the drawings. (A) of FIG. 7 is a principal part top view of this bite, (b) is a principal part front view. FIG. 8 is a plan view of a chip mounted on the cutting tool shown in FIG.

  As shown in FIG. 7, the tool main body 10 of the cutting tool according to the present embodiment has a substantially rod shape, and a shank 10A provided on the proximal end side thereof, and a blade portion 10B provided on the distal end side of the shank 10A. The tip seat 31 is notched at the tip of the upper surface of the blade portion 10B. Further, the blade portion 10B is provided with a clamp mechanism for detachably fixing the tip 20 placed on the tip seat 31. More specifically, this clamping mechanism rotates the clamping screw 62 and swivels it, so that the L-shaped lever pin 50 incorporated in the tool body 10 has a rotational motion with the L-shaped corner portion 51 as a fulcrum. At the same time as the tip 20 is fixed to the tip seat 31, the clamping screw 62 also acts on the presser foot 61, and the tip 20 is moved through the deposit 70 by the sinking force of the tip of the presser foot 61. It is pressed against the bottom surface of the chip seat 31 and fixed.

  As shown in FIG. 8, the tip 20 mounted on the cutting tool has a substantially square plate shape. One square surface is a rake face 22, and a circumferential surface intersecting the rake face 22 is a flank face 23. A cutting edge is formed at the intersection ridge line where the rake face 22 and the flank face 23 intersect. The edge of each corner portion of the square surface that becomes the rake face 22 is continuously formed with a wiping blade 21a and a secondary cutting edge 21b, and each side of the square surface connected to one end of the secondary cutting blade 21b has a main cutting edge. A blade 21c is formed. Further, the tip 20 is a so-called negative tip in which the angle formed by the rake face 22 and the flank face 23 intersecting each other with the wiping edge 21a, the auxiliary cutting edge 21b, and the main cutting edge 21c interposed therebetween is a right angle. When the tip 20 is mounted on the tool body 10, the tip 20 has a square surface serving as a rake face 22 facing forward in the tool rotation direction K, and the wiping blade 21 a protrudes to the outermost side with respect to the side surface of the tool body 10. The auxiliary cutting edge 21b adjacent to the cutting edge 21a extends so as to gradually go inward from the cutting edge 21a toward the tool tip side. To be arranged. Furthermore, the approach angle Ψb in the sub cutting edge 21b is set in a range of 75 ° or more and 88 ° or less. The approach angle Ψc of the main cutting edge 21c is not particularly limited as long as it is equal to or smaller than the approach angle Ψb of the auxiliary cutting edge 21b, but is set to about 25 ° in the present embodiment.

Furthermore, the rake angle γp in the sub cutting edge 21b is set in a range of −10 ° to 25 °. In FIG. 5, since this tool is equipped with a negative tip, the rake angle γp is on the negative side (-10 ° or more and −5 ° or less), but when a positive tip with a positive clearance angle is attached, γp changes from a small negative value to the positive side (greater than −5 ° and 25 ° or less).

  In the cutting tool described above, similarly to the face milling described above, the approach angle Ψb of the auxiliary cutting edge 21b is set to 75 ° or more and 88 ° or less so that the cutting is seen in the direction perpendicular to the auxiliary cutting edge 21b. Since the thickness becomes sufficiently small and the cutting resistance acting on the cutting surface in contact with the auxiliary cutting edge 21b becomes small, the edge chipping at the end portion of the cutting surface is suppressed. Further, since the cutting resistance acting on the sub cutting edge 21b is reduced, the sub cutting edge 21b is prevented from being lost, and the tool life is prevented from deteriorating. Furthermore, since the rake angle γp of the sub cutting edge 21b is set in the range of −10 ° to 25 °, the cutting resistance acting on the work surface in contact with the sub cutting edge 21b is further reduced. The effect of suppressing edge chipping at the end is further increased.

  The shape of the ridgeline of the auxiliary cutting edge 21b as viewed from the direction perpendicular to the rake face 22 is not limited to a single straight line, but a plurality of straight lines, one or a plurality of arcs, or one or You may comprise by several arcs and one or several straight lines. Here, the approach angle Ψb of the secondary cutting edge 21b is defined by the approach angle at the tangent line of each position of the secondary cutting edge 21b.

In the third embodiment, for example, carbon steel or alloy as represented by cast iron defined in JIS G 5501 of Japanese Industrial Standard (JIS) or aluminum alloy defined in JIS H 5202, JIS H 5302, or the like. When cutting a work material having a hardness lower than that of steel, if the ridgeline of the secondary cutting edge 21b is formed as a sharp edge without honing throughout the secondary cutting edge 21b, the sharpness of the secondary cutting edge 21b is improved. In addition, the effect of suppressing edge cracks is further increased. Alternatively, depending on cutting conditions, when the wiping blade 21a, the auxiliary cutting edge 21b, or the main cutting edge 21c is chipped in the cutting of gray cast iron or aluminum alloy, the wiping edge 21a, the auxiliary cutting edge 21b, and the main cutting edge 21c. In addition to preventing chipping by forming the honing 24, the honing width W of the wiping edge 21a and the auxiliary cutting edge 21b is smaller than the honing width W of the main cutting edge 21c when viewed from the direction perpendicular to the rake face 22. Therefore, it is desirable to suppress edge cracks (see FIG. 4C).
On the other hand, when cutting carbon steel or alloy steel, it is desirable to form the honing 24 over the wiping blade 21a, the auxiliary cutting blade 21b, and the main cutting blade 21c in order to prevent chipping. Further, in consideration of suppressing occurrence of edge chipping due to chipping of the auxiliary cutting edge 21b, the honing width W of the auxiliary cutting edge 21b is larger than the honing width W of the wiping edge 21a when viewed from the direction perpendicular to the rake face 22. And it is desirable that it is equal to or larger than the honing width W of the main cutting edge 21c.
Alternatively, the honing width W of the main cutting edge 21c is desirably set wider than the honing width W of the wiping edge 21a and the auxiliary cutting edge 21b. This is because the cutting edge reinforcing action of the honing 24 extends the cutting edge life, and the honing width W of the wiping edge 21a and the auxiliary cutting edge 21b is made smaller than the honing width W of the main cutting edge 21a. This is intended to prevent the decrease in the edge loss and to prevent the decrease in the edge loss as much as possible.

  Alternatively, in the third embodiment, when the honing 24 is formed over the wiping edge 21a, the auxiliary cutting edge 21b, and the main cutting edge 21c, the auxiliary cutting edge is related to the honing angle θ that is an angle formed by the rake face 22 and the honing face. When the honing angle θ of 21b is set to be larger than the honing angle θ of the wiping blade 21a, chipping is suppressed from occurring on the sub-cutting blade 21b. At this time, if the honing angle θ of the main cutting edge 21c is set larger than the honing angle θ of the auxiliary cutting edge 21b, the cutting edge life is extended by the cutting edge reinforcing action of the honing 24.

  The present invention is not limited to the face mill and the cutting tool described in the above embodiment, and can be applied to almost all cutting tools such as an end mill, a side cutter, a drill, and a boring cutter, and becomes a cutting edge. In addition to a cutting tool in which a chip is detachably attached to a tool body, a cutting blade member serving as a cutting blade may be fixed to the tool body by fixing means such as brazing.

It is a bottom view of the principal part of the front milling machine concerning a 1st embodiment. It is a partial longitudinal cross-sectional view of the principal part of the face mill shown in FIG. It is an enlarged side view of the cutting edge shape in the face mill shown in FIG. It is a figure explaining the throw away tip with which the front milling machine shown in FIG. 1 is mounted | worn, (a) is a top view, (b) is a side view, (c) is a schematic diagram of the honing cross section in a cross section orthogonal to a cutting blade It is. It is a partial longitudinal cross-sectional view of the front milling machine which concerns on 2nd Embodiment. It is a principal part expanded side view of the front milling machine shown in FIG. It is a figure which shows the edge missing condition of the cutting surface by a face mill. It is a figure explaining the byte | cutting-tool concerning 3rd Embodiment, (a) is a principal part top view, (b) is a principal part front view. It is a top view of the throw away tip with which the cutting tool shown in FIG. 7 is attached.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tool main body 20 Tip 21a Swivel blade 21b Sub cutting edge 21c Main cutting edge 22 Rake face 23 Relief face 24 Honing 31a Tip seat 40 Wedge member Ψb Sub cutting edge approach angle γp Sub cutting edge rake angle CL Center axis of tool main body K Tool rotation direction

Claims (6)

In a cutting tool with a throwaway tip attached to the tool body,
The throw-away tip has a polygonal flat plate shape, a rake face is formed on at least one of the polygonal faces, a flank face is formed on the peripheral surface, and a cutting edge is formed at a crossing ridge line portion between the rake face and the flank face. And
The clearance angle of the flank is 0 °,
The cutting blade includes at least a wiping blade extending in a direction substantially parallel to the feeding direction of the cutting tool, a sub-cutting blade that intersects the wiping blade and extends forward in the feeding direction of the wiping blade, A main cutting edge that intersects the secondary cutting edge and extends in the cutting direction of the cutting tool,
The approach angle of the secondary cutting edge is set in a range of 75 ° to 88 °, and the rake angle in the secondary cutting blade is set in a range of −10 ° to −5 °. Cutting tools.   2. The cutting tool according to claim 1, wherein the ridgeline of the secondary cutting edge is formed as a sharp edge without honing throughout the secondary cutting edge.   Honing is formed in the wiping blade, the secondary cutting edge, and the main cutting edge along the edge of the cutting edge, and the honing of the secondary cutting edge is honed by the wiping edge when viewed from a direction perpendicular to the rake face. The cutting tool according to claim 1, wherein the cutting tool is formed wider.   The honing is formed along the edge of the cutting edge in the wiping blade, the auxiliary cutting edge and the main cutting edge, and the honing angle of the auxiliary cutting edge is set larger than the honing angle of the wiping edge. The cutting tool according to claim 1, wherein:   The honing is formed along the cutting edge ridge line in the wiping blade, the sub cutting edge, and the main cutting edge, and the honing of the main cutting edge is seen from the direction perpendicular to the rake face. The cutting tool according to claim 1, wherein the cutting tool is formed wider than honing of the wiper blade. The honing is formed along the edge of the cutting edge in the wiping blade, the auxiliary cutting edge, and the main cutting edge, and the honing angle of the main cutting edge is set larger than the honing angle of the auxiliary cutting edge and the wiping edge. The cutting tool according to claim 1, wherein the cutting tool is provided.

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