JP2017121668A - Plate-like member of cutting tool, tool block, and cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting tool which adjusts a protruding length of a curved plate-like member to inhibit chattering vibration or enable improvement of the appearance quality of a finished surface.SOLUTION: A plate-like member of a cutting tool of the invention has an upper surface, a lower surface, two end surfaces, and two side surfaces. A first side surface of the side surfaces is a curved surface. The upper surface is a curved surface. A tool block of the invention is used to hold the plate-like member of the cutting tool of the invention and has a lower surface-restraining surface that contacts with the lower surface of the plate-like member. The clamp member of the invention is used to fix the plate-like member of the cutting tool of the invention to the tool block of the invention and has an upper surface-restraining surface that contacts with the upper surface of the plate-like member. The cutting tool of the invention includes the plate-like member of the invention.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a plate-like member of a cutting tool. Moreover, it is related with the cutting tool provided with the tool block and clamp member for fixing the plate-shaped member, and the plate-shaped member.

  There exist some which are shown in patent document 1 in the conventional cutting tool. That is, it is an end face grooving cutting tool for grooving an end face of a workpiece, and a member called an adjustment blade is used. A part of the adjustment blade has a curved plate shape. A cutting insert is detachably attached to the plate-shaped portion. The adjusting blade is fixed to the member on the shank side with two bolts. The protruding length of the curved plate-shaped portion is determined as the length of the curved plate-shaped portion of the adjustment blade.

Japanese Utility Model Publication No. 63-140303

  The cutting tool of Patent Document 1 does not have a mechanism for adjusting the protruding length of a curved plate-shaped portion. As described above, the protruding length of the curved plate-shaped portion is determined as the length of the curved plate-shaped portion of the adjustment blade. In general, a cutting tool having a long protruding length has an advantage of less interference with a workpiece. On the other hand, chatter vibration may easily occur in a cutting tool having a long protruding length depending on processing conditions. Therefore, there are cases where it is a drawback when it is desired to increase the machining efficiency or when it is desired to improve the quality of the finished surface. It is desired that the protruding length of the cutting tool can be appropriately adjusted according to the shape of the workpiece, cutting conditions, and the like.

  The present invention uses a plate-like member of a cutting tool. The plate member has a curved plate shape, and the protruding length of the plate member from the tool block can be adjusted. The present invention provides a cutting tool capable of suppressing chatter vibration by appropriately adjusting the protruding length. Alternatively, a cutting tool capable of improving the quality of the finished surface is provided.

  The plate-like member of the cutting tool of the present invention has an upper surface, a lower surface, two end surfaces, and two side surfaces. Of the side surfaces, the first side surface is a curved surface. The upper surface is a curved surface.

  The tool block of the present invention is a tool block for holding the plate-shaped member of the cutting tool of the present invention, and has a lower surface constraining surface that contacts the lower surface of the plate-shaped member.

  The cutting tool of this invention is a cutting tool provided with the plate-shaped member of this invention.

  According to the plate-like member of the cutting tool of the present invention, the protruding length of the plate-like member from the tool block can be adjusted while using the curved plate-like member. That is, the protrusion length of the cutting tool can be adjusted appropriately according to the shape of the workpiece and the cutting conditions. For this reason, chatter vibration can be suppressed while avoiding interference with the workpiece. Or processing quality, such as finishing surface roughness, can be improved.

  According to the tool block and the clamp member of the present invention, the synergistic effect with the plate-shaped member of the present invention can achieve high tool rigidity while adjusting the protruding length in a timely manner, and can greatly suppress the occurrence of chatter vibration. A cutting tool can be provided.

FIG. 1 is a perspective view of a cutting tool according to an embodiment of the present invention. FIG. 2 is a front view of the cutting tool of FIG. FIG. 3 is a perspective view of a plate-like member of the cutting tool of FIG. FIG. 4 is a right side view of the plate-like member of FIG. FIG. 5 is a front view of the plate-like member of FIG. FIG. 6 is a plan view of the plate-like member of FIG. FIG. 7 is a left side view of the plate-like member of FIG. FIG. 8 is a perspective view of a cutting insert of the cutting tool of FIG. FIG. 9 is a perspective view of a tool block of the cutting tool of FIG. FIG. 10 is a front view of the tool block of FIG. FIG. 11 is a plan view of the tool block of FIG. FIG. 12 is a left side view of the tool block of FIG. FIG. 13 is a perspective view of a clamp member of the cutting tool of FIG. FIG. 14 is a perspective view from another direction of the clamp member of FIG. FIG. 15 is a perspective view for explaining end face grooving by a plate-like member of the cutting tool of FIG. FIG. 16 is a rear view for explaining the end surface groove processing of FIG. 15.

  An embodiment of a cutting tool to which the present invention is applied will be described with reference to the drawings. As shown in FIGS. 1 to 14, a cutting tool 1 according to an embodiment of the present invention is an end surface grooving cutting tool for performing grooving on an end surface of a workpiece. End face grooving is grooving as shown in the conceptual diagrams of FIGS. 15 and 16. When the groove 61 is processed on the end surface of the workpiece 60 with a lathe, the circular groove 61 is processed. For easy understanding, FIGS. 15 and 16 show only the plate-like member 2 as the cutting tool 1. Actually, the plate-like member 2 becomes the cutting tool 1 by being fixed to the tool block 30 by the clamp member 40 and the fixing member 50. As shown in FIG. 8, the cutting tool 1 uses a cutting insert 20 having a cutting edge at the intersecting ridge line between the front surface, the left and right side surfaces, and the upper surface (rake surface). However, the shape of the cutting edge and the shape of the cutting insert 20 are not limited to this embodiment. Various known shapes of the cutting insert 20 can be applied. The cutting tool 1 of this embodiment is a cutting tool 1 that is particularly suitable for end face grooving. As described above, in the end face grooving, since the shape of the groove 61 to be processed is circular, it is preferable that the periphery of the cutting edge of the cutting tool 1 to be applied has a curved plate shape. Since the periphery of the cutting edge of the cutting tool 1 has a curved plate shape, the plate-like portion is accommodated in the circular groove 61 as shown in the conceptual diagram of FIG. .

  The cutting insert 20 is detachably attached to the chip seat 13 of the plate-like member 2. In the case of the end face grooving cutting tool 1, various known grooving cutting inserts 20 can be applied. In this embodiment, the cutting insert 20 is fixed by elasticity around the chip seat 13. That is, when the cutting insert 20 is mounted, the cutting insert 20 is pushed into the chip seat 13 and is fixed by elastically deforming the periphery of the chip seat 13. When the cutting insert 20 is removed, the periphery of the tip seat 13 is released from elastic deformation. The holes provided in the plate-like member 2 shown in FIG. 4 and the like are holes for a dedicated tool for removing the cutting insert 20. A dedicated tool for attaching or removing the cutting insert 20 is called a wrench, a driver, or the like. By using the cutting tool 1 for cutting, when the cutting insert 20 is damaged such as wear, it can be replaced with another cutting insert 20. Therefore, this cutting tool 1 can be used repeatedly and is economical. When the cutting insert 20 is fixed by the elasticity around the tip seat 13 as described above, the structure around the tip seat 13 is simple, and there are no parts that interfere with the workpiece 60. For this reason, especially in end face grooving, the chip dischargeability is high, which is advantageous. The fixing method for mounting the cutting insert 20 to the plate-like member 2 is not limited to this embodiment. Various known methods for fixing the cutting insert 20 can be applied. Moreover, it is not limited to using the cutting insert 20. A chip having a cutting edge may be brazed to the plate member. (Not shown) The plate-like member 2 may be made of a hard material such as cemented carbide or ceramic, and may be the plate-like member 2 integrally provided with a cutting edge. In this embodiment (not shown), a cutting insert 20 having a cutting edge width of about 4 mm was used. That is, the cutting tool 1 for end face grooving is suitable for machining a groove 61 having a groove width of about 4 mm on the workpiece 60. However, the width of the cutting edge is not limited to this embodiment. The width of the cutting edge may be appropriately selected according to the width of the groove of the workpiece to be processed.

  As described above, the plate-like member 2 is fixed to the tool block 30 by the clamp member 40 and the fixing member 50. The tool block 30 has an attachment reference surface 31. The portion of the reference mounting surface 31 is mounted on a mounting portion of a machine tool such as a lathe. The lathe mounting part is called a tool post or the like. Details of the configuration of the tool block 30 will be described later. As shown in FIGS. 3 to 7, the plate-like member 2 has an upper surface 3, a lower surface 4, two end surfaces 5 and 6, a first side surface 7, and a second side surface 8. The two end surfaces 5 and 6 are referred to as a front end surface 5 and a rear end surface 6 for convenience. The tip seat 13 may be formed on the upper surface 3 side on the front end surface 5 side. For ease of explanation, terms such as the upper surface 3 and the front end surface 5 are used to indicate the orientation in the space. However, this is for convenience, and the absolute orientation and positional relationship in the space are determined. It is not intended to be specified. Unless otherwise noted, the same applies to terms representing orientations and positional relationships in other spaces.

  As seen in FIGS. 3 and 5, the first side surface 7 of the plate-like member 2 is a curved surface that curves so as to protrude outward. That is, the first side surface 7 is a curved surface that swells outward. The second side surface 8 on the opposite side is a curved surface that curves so as to be recessed inward. The shapes of the first and second side surfaces 7 and 8 are restricted so as not to interfere with the processed shape of the workpiece. That is, as shown in the conceptual diagram of FIG. 16, in the case of end face grooving, a part of the plate-like member 2 enters the inside of the groove 61 that has been processed into a circular shape, and the cutting blade is fed to the back of the groove. Can be held when. In other words, the plate-like member 2 is curved so as to be able to enter the groove 61 processed into a circular shape of the workpiece without interference. That is, the radius of curvature of the second side surface 8 is set to be equal to or greater than half the processing diameter (diameter) of the wall surface on the center side of the groove where the workpiece is processed. The radius of curvature of the first side surface 7 is set to be equal to or smaller than the radius of curvature obtained by adding the width of the cutting edge to half of the processing diameter (diameter). With such a curvature radius, the plate-like member 2 is secured to escape on both sides between the processed groove shape. That is, it has a clearance angle on both sides. As seen in the right side view of FIG. 4, when viewed from the direction facing the first side surface 7, the outer shape of the first side surface 7 of the plate-like member 2 is two long sides 9 and 10 respectively. It is a substantially quadrilateral having short sides 11 and 12. Moreover, the two long sides 9 and 10 are substantially parallel to each other. Here, the boundary between the first side surface 7 and the lower surface 4 is defined as the first long side 9. The intersecting ridge line between the first side surface 7 and the front end surface 5 is defined as a first short side 11. The boundary between the first side surface 7 and the lower surface 4 may be smoothly connected without forming an intersecting ridge line. Thus, the plate-like member 2 can be adjusted to the protruding length from the tool block 30 by being substantially quadrilateral. Specifically, the plate-like member 2 has a cross-sectional shape orthogonal to the intersecting ridgeline so that the protruding length in the direction parallel to the intersecting ridgeline 9 between the lower surface 4 and the first side surface 7 can be adjusted. It is constant within a predetermined range. That is, since the cross-sectional shape is constant within a predetermined range, clamping is possible at an arbitrary position in the direction of the intersecting ridge line. The contact positions of the plate-like member 2 with the tool block 30 and the clamp member 40 can be shifted within a predetermined range necessary for adjusting the protruding length of the plate-like member 2. This intersecting ridge line is the first long side 9. An inclined surface was formed around the chip seat 13 of the plate-like member 2. This inclined surface is a surface used as a chip pocket for chip discharge. However, in the cutting tool 1 of this embodiment, it did not curve concavely, but was flat. Therefore, it may be referred to as a chip guide surface instead of a chip pocket. The chip guiding surface is a surface that guides the chip to be discharged from the processed groove of the workpiece. In the cutting tool 1 of this embodiment, the predetermined range in which the cross-sectional shape is constant is the entire region other than the chip guide surface. That is, the cross-sectional shape from the rear end face 6 to the area where the chip guiding surface starts is constant. If the cross-sectional shape is formed in such a shape, it is easy to manufacture the plate-like member 2 with high accuracy by grinding or the like. That is, the clamp rigidity can be increased. However, it is not limited to this. The range in which the cross-sectional shape is constant may be ensured according to the adjustment amount of the protruding length of the plate-like member 2. The portion that does not affect the adjustment of the protruding length may have any shape.

  As seen in the front view of FIG. 5, the upper surface 3 and the lower surface 4 of the plate-like member 2 are curved surfaces that bulge outward. Both the upper surface 3 and the lower surface 4 are surfaces that are used as contact surfaces when the plate-like member 2 is fixed to the tool block 30. The lower surface 4 is in contact with the tool block 30. The upper surface 3 is in contact with the clamp member 40. If the upper surface 3 is not a curved surface but a flat surface, the contact state with the clamp member 40 tends to become unstable. Because the first side surface 7 and the second side surface 8 of the plate-like member 2 are curved, when the plate-like member 2 is elastically deformed by applying a clamping force, the inclination angle of the upper surface 3 with respect to the lower surface 2 changes. Resulting in. Then, the contact between the upper surface 3 and the clamp member 40 changes from surface contact to line contact or point contact. In either case, the contact point becomes a marginal line at the corner of the upper surface 3, and the corner is crushed and plastic deformation is likely to occur. Therefore, problems such as a decrease in clamp rigidity may occur during the cutting process. By making the upper surface 3 a curved surface, even if the plate-like member 2 is elastically deformed, the upper surface 3 can be kept in contact with the clamp member 40 within the surface. In the cutting tool 1 of this embodiment, the upper surface 3 and the lower surface 4 of the plate-like member 2 are respectively cylindrical surfaces. For this reason, the upper surface 3 and the lower surface 4 are in contact with the tool block 30 at approximately the center of the surface. Therefore, the fixed state of the plate-like member 2 to the tool block 30 is stabilized every time. However, it is not limited to this. The curved surfaces of the upper surface 3 and the lower surface 4 may have any shape as long as they can contact the tool block 30 and the clamp member 40. For example, the contact position with the tool block 30 may be biased toward the second side surface 8 side or the like. The upper surface 3 and the lower surface 4 may be curved surfaces that are concave inward. However, when the contact surface on the tool block 30 side is a flat surface, the upper surface 3 and the lower surface 4 of the plate-like member 2 are preferably curved surfaces that protrude outward. If the contact surface on the tool block 30 side is a flat surface, it is easy to manufacture, and the cutting tool 1 with high clamping rigidity can be obtained at a low cost. The plate-like member 2 is firmly fixed to the tool block 30 by using at least three surfaces of the upper surface 3, the lower surface 4 and the first side surface 7 as contact surfaces. As a result, the clamp rigidity is increased and the occurrence of chatter vibration can be suppressed. Alternatively, the quality of the finished surface can be improved. In addition, when making the upper surface 3 and the lower surface 4 into curved surfaces, you may approximate by the polyhedron which arranges many elongate planes. As long as the obtuse angle is set so as not to cause plastic deformation by the contact of the plate-like member 2 with the tool block 30, the curved surface may be approximated by a polyhedron and a large number of corners may be formed. However, the thing of the grade by which the planar chamfer was simply attached to the corner | angular part of the upper surface 3 and the lower surface 4, and the side surfaces 7 and 8 is excluded. When a curved surface is formed by adding a chamfer or the like, a curved chamfer, a so-called R chamfer or the like is used. Note that it is preferable that the entire upper surface 3 or the lower surface 4 is a curved surface, not a curved surface only by a curved chamfer.

  As described above, as shown in FIGS. 9 and 10, the tool block 30 of the cutting tool 1 of this embodiment has the attachment reference surface 31. The longitudinal direction of the attachment reference surface 31 is defined. The tool block 30 is good to make one side seen from the longitudinal direction into the front. Here, together with the front direction of the plate-like member 2, the direction of FIG. The periphery of the attachment reference plane 31 can also be called a shank portion. The mounting reference surface 31 is pressed against a tool post of a machine tool such as a lathe, and the tool block 30 is mounted on the machine tool. That is, the tool block 30 is a member that holds the plate-like member 2 and is attached to the machine tool. The tool block 30 of this embodiment has a vertical wall surface near the attachment reference surface 31 formed on the lower surface side. This vertical wall surface can also be used as a reference surface in the width direction when mounted on the machine tool. A shape corresponding to a tool post, a holder, an adapter, or the like of a machine tool is arbitrarily selected as the attachment reference surface 31 and the reference surface in the width direction of the tool block 30. The tool block 30 has a lower surface restraining surface 32 that contacts the lower surface 4 of the plate-like member 2. The lower surface restraining surface 32 has a shape corresponding to the inclined portion of the lower surface 4 of the plate-like member 2. That is, the lower surface restraint surface 32 is inclined with respect to the attachment reference surface 31. In this embodiment, since the lower surface 4 of the plate-like member 2 is a flat surface, the lower surface restraining surface 32 of the tool block 30 is also a flat surface. However, it is not limited to this. The lower surface restraining surface 32 may be any surface as long as it has a shape that can contact the inclined portion of the lower surface 4. The inclination angle A shown in the front view of FIG. 11 with respect to the attachment reference surface 31 of the lower surface restraint surface 32 is preferably in the range of 90 ° or more and 170 ° or less. The inclination angle A is more preferably in the range of 100 ° or more and 130 ° or less. With such an inclination angle A, when the plate member 2 comes into contact with the lower surface 4, a restraining force is generated toward the first side surface 7, and the plate member 2 is fixed to the tool block 30. Increases nature. In this embodiment, the inclination angle A of the lower surface restraint surface 32 with respect to the attachment reference surface 31 is about 115 °.

  The tool block 30 has a side restraint surface 33 that contacts the first side surface 7 of the plate-like member 2. In this embodiment, the side restraint surface 33 has a two-stage structure. That is, the side restraint surface 33 has a first contact portion 34 and a second contact portion 35. Since the first side surface 7 of the plate-like member 2 is a curved surface, the plate-like member 2 having various curvature radii can be obtained by matching the shape of the side restraint surface 33 with the curved shape of the first side surface 7. On the other hand, the tool block 30 cannot be shared. Further, it may be difficult in manufacturing to make the shape of the side restraint surface 33 of the tool block 30 completely coincide with the curved shape of the first side surface 7. Therefore, by making the side restraint surface 33 into a two-stage structure, the contact surface is positively made into two points and can be applied to the plate-like member 2 having various radii of curvature. Alternatively, the plate-like member 2 can be stably fixed to the tool block 30. That is, the side restraint surface 33 has the first contact portion 34 and the second contact portion 35, so that it contacts the first side surface 7 of the plate-like member 2 at two points. In addition, due to the contact between the lower surface 4 and the lower surface restraining surface 32, the posture of the plate member 2 is stably determined by the contact at three points. Therefore, a slight difference in the radius of curvature of the plate-like member 2 can be absorbed. Further, the fixing of the plate member 2 is very stable.

  The tool block 30 has a guide surface 36 that comes into contact with the clamp member 40 on the upper surface facing the attachment reference surface 31. As shown in FIGS. 13 and 14, the clamp member 40 has an upper surface restraining surface 41 that contacts the upper surface 3 of the plate-like member 2 and a guided surface 42 that contacts the guide surface 36 of the tool block 30. The clamp member 40 is fixed to the tool block 30 by a fixing member 50 such as a fastening bolt. By clamping the fixing member 50, the clamping member 40 fixes the plate-like member 2 to the tool block 30. That is, the tool block 30 has a fixing means corresponding to the fixing member 50. That is, when the fixing member 50 is a tightening bolt, the tool block 30 has a screw hole of a female screw corresponding to the male screw of the tightening bolt. In the cutting tool 1 of this embodiment, as described above, the posture of the plate-like member 2 is stably determined by three-point contact. Therefore, the plate member 2 is completely fixed to the tool block 30 by pressing the upper surface 3 of the plate member 2 with the upper surface restraining surface 41 of the clamp member 40. In this embodiment, the fixing member 50 is four fastening bolts. However, it is not limited to this. The fixing member 50 may be a single fastening bolt. Also, two, three, or five or more fastening bolts may be used. Of course, a fastening method other than bolts may be used. The guide surface 36 of the tool block 30 is inclined in the same direction as the inclination direction of the lower surface restraining surface 32. Therefore, the guide surface 36 is inclined in the direction opposite to the upper surface 3 of the plate-like member 2. That is, the guide surface 36 generates a force that pulls the clamp member 40 toward the first side surface 7 of the plate-like member 2. For this reason, when the upper surface restraining surface 41 of the clamp member 40 contacts the upper surface 3 of the plate-like member 2, a force that presses the plate-like member 2 toward the first side surface 7 is generated. Due to the synergistic effect of these structures, the plate-like member 2 is fixed to the tool block 30 very firmly. As a result, the clamp rigidity is increased, and the occurrence of chatter vibration is greatly suppressed. Or the quality of the finished surface is greatly improved. The clamp member 40 of this embodiment has two slits. This slit is provided to promote elastic deformation of the clamp member 40. By providing the slit, the clamp member 40 is easily elastically deformed, and can come into close contact with the plate-like member 2 and the tool block 30 in a wider range. Therefore, the clamp is further stabilized. However, it is not limited to this. One slit or three or more slits may be provided. The slit may not be provided.

  The plate-like member 2 and the tool block 30 can be configured such that the protruding length of the plate-like member 2 can be adjusted stepwise by a method of providing a convex portion on one side and a concave portion on the other side. Furthermore, it is more preferable that the plate-like member 2 and the tool block 30 are provided with a mark such as a scale so that the protruding length can be visually confirmed. In addition, various conventional techniques for adjusting the protruding length of the cutting tool can be applied.

  The cutting material of the cutting insert 20 or the plate-like member 2 and the tool material around the cutting blade are hard materials such as cemented carbide, cermet, ceramic, cubic boron nitride, or PVD or CVD coating film on the surface of these hard materials. It is preferable to select from those coated with diamond or diamond.

  The plate-like member of this cutting tool is applied to various cutting tools, and the cutting tool is mounted on a machine tool, so that it can be used for cutting a steel material or the like. In particular, it is effective when it is applied to a lathe tool, a rotary cutting tool, or the like, and grooves are formed on the end face of the workpiece. Although only the cutting tool for end face grooving for lathes is described in the embodiment, the present invention can also be applied to a rotary cutting tool called a trepanning tool. A trepanning tool is a rotary cutting tool for grooving or drilling.

  The plate-like member, tool block, and cutting tool of the cutting tool of the present invention are not limited to the above-described embodiments, and various modifications and additions can be made without departing from the gist of the present invention. is there. For example, a chip seat may also be provided on the rear end face side of the plate-like member, and the structure may be used as an end face grooving cutting tool.

DESCRIPTION OF SYMBOLS 1 Cutting tool 2 Plate-shaped member 3 Upper surface 4 Lower surface 5 Front end surface 6 Rear end surface 7 1st side surface 8 2nd side surface 9 1st long side 10 2nd long side 11 1st short side 12 2nd short Side 13 Tip seat 20 Cutting insert 30 Tool block 31 Attachment reference surface 32 Lower surface restraint surface 33 Side surface restraint surface 34 First contact portion 35 Second contact portion 36 Guide surface 40 Clamp member 41 Upper surface restraint surface 42 Guided surface 50 Fixed Member 60 Workpiece 61 Groove A to be machined Inclination angle of tool block constraining surface with respect to reference mounting surface

Claims (12)

A plate-like member (2) of the cutting tool (1),
Having an upper surface (3), a lower surface (4), two end surfaces (5, 6), and two side surfaces (7, 8);
Of the side surfaces (7, 8), the first side surface (7) is a curved surface,
The upper surface (3) is a plate-like member having a curved surface.   The plate-like member according to claim 1, wherein the cutting tool (1) is used for grooving.   The plate-like member according to claim 1 or 2, comprising a tip seat (13) and detachably mounting the cutting insert (20).   The plate-like member according to claim 3, wherein the cutting insert (20) is fixed by elasticity around the tip seat (13).   The plate-like member according to any one of claims 1 to 4, wherein the first side surface (7) is a curved surface bulging outward.   The plate-like member according to any one of claims 1 to 5, wherein the upper surface (3) is a curved surface that swells outward.   The plate-like member according to any one of claims 1 to 6, wherein the lower surface (4) is a curved surface.   The plate-like member according to claim 7, wherein the lower surface (4) is a curved surface that bulges outward. A tool block (30) for holding the plate-like member (2) according to any one of claims 1 to 8,
A tool block having a lower surface restraining surface (32) in contact with the lower surface (4) of the plate-like member (2).   The tool block according to claim 9, having a side restraint surface (33) corresponding to the first side surface (7) of the plate-like member (2).   11. A tool block according to claim 10, wherein the side restraint surface (33) has at least two contact portions (34, 35) in contact with the first side surface (7).   A cutting tool comprising the plate-like member (2) according to any one of claims 1 to 8.

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