JP5589401B2 - Replaceable cutting edge grooving tool and end face grooving method - Google Patents

Description

  The present invention relates to a blade-exchange-type grooving tool and an end face grooving method using the same.

  Conventionally, a work material made of a metal material or the like is rotated around a rotation axis, and grooving is performed with a cutting insert cutting edge on an end surface facing the rotation axis in a step formed on the outer peripheral surface of the work material. There is known an edge-changing grooving tool that performs the above. For example, in a conventional cutting edge-replaceable grooving tool 100 shown in FIG. 12, a cutting insert 30 formed in a rod shape having a rectangular cross section is detachably attached to the tip of a tool body 1 having an axial shape. The cutting insert 30 has a pair of cutting edges 32 at both ends in the extending direction (vertical direction (X direction in FIG. 12)) of the rod-shaped insert main body 31. Of these cutting edges 32, one of the cutting edges 32A protruding from the tip end surface of the tool body 1 is grooved into the end face E facing the rotation axis WO direction at the stepped portion U of the work material W having a multistage cylindrical shape. Processing (outer diameter side end face grooving) is performed. In the example of FIG. 12, the end surface E of the work material W is orthogonal to the rotation axis WO and is formed adjacent to the small diameter portion of the outer peripheral surface (circumferential surface) R of the stepped portion U. One cutting edge 32A Grooving the end face E by moving in the X direction parallel to the rotation axis WO along the small diameter portion. The cutting insert 30 is rotationally symmetric with respect to an insert height axis C3 that passes through the center in the extending direction and the width direction of the insert body 31 and extends in the height direction perpendicular to the extending direction and the width direction. It is formed symmetrically with respect to an insert virtual plane (not shown) that includes the height axis C3 and is orthogonal to the extending direction, regardless of whether the specification of the tool body 1 is left-handed or right-handed. 32B can be used.

In FIG. 12, the other cutting edge 32B of the pair of cutting edges 32 is not used for cutting, and when one of the cutting edges 32A becomes unsuitable for use due to wear, chipping, or the like, Is inverted in the extending direction so that the cutting edge 32B protrudes from the tip surface of the tool body 1 and is used for grooving.
In this way, the blade tip exchange-type grooving with respect to the end surface (outer diameter side end surface) E which is arranged radially outward of the outer peripheral surface R in the small diameter portion of the work material W and faces the rotation axis WO direction. The outer diameter side end face grooving using the tool 100 is performed.
Moreover, what was described in patent document 1 is known as another cutting insert used for such a grooving process, for example.

Japanese Patent Publication No.7-115251

However, the above-described cutting edge exchange type grooving tool 100 has the following problems.
In the cutting insert 30, the extending direction of the insert body 31 (insert longitudinal axis C <b> 1 shown in FIG. 12) is parallel to the rotation axis WO of the work material W, and is relative to the outer peripheral surface R of the work material W. The pair of cutting blades 32 have the same distance from the small diameter portion of the outer peripheral surface R to each other. There is no particular problem when one cutting edge 32A is separated from the small-diameter portion of the work material W and grooving the end face E in such an arrangement state of the cutting insert 30, but the cutting edge 32A is not covered. When grooving the end face E while moving along the small diameter portion of the cutting material W, the other cutting edge 32B comes into contact with the small diameter portion and is damaged. As shown in FIG. 12, the distance (depth) d1 from the end face F located closest to the base end side of the tool body 1 to the end face E of the stepped portion U in the work material W, and the other cutting edge 32B When the relationship with the distance L3 to the end face E is d1 <L3, there is no contact, but since contact is made when d1 ≧ L3, the shape of the work material W is limited, and during the machining It is conceivable that the aforementioned contact occurs as the distance L3 is reduced. When such contact occurs, not only the processing accuracy of the work material W cannot be ensured, but also the other unused cutting edge 32B is damaged. Specifically, as shown in FIG. 13, the corner portion 43 </ b> C located on the small-diameter portion side of the outer peripheral surface R of the work material W contacts the small-diameter portion at the other cutting edge 32 </ b> B. For this reason, end face grooving along the outer peripheral surface R of the work material W as shown in FIG. 12 could not be performed.

  In order to prevent the aforementioned contact, in the cutting insert described in Patent Document 1, the cutting insert is formed rotationally symmetric with respect to the insert height axis, while being formed plane-symmetrically with respect to the insert virtual plane. Instead, the insert body is formed to be twisted as a whole. Thus, when the cutting insert is mounted on the tool body, the corner portion on the small diameter portion side of the outer peripheral surface R of the other cutting edge is separated from the small diameter portion than the corner portion on the small diameter portion side of one cutting blade. To be. However, in this case, left-handed and right-handed cutting inserts must be prepared in accordance with the specifications of the tool body, which increases the number of parts and makes management complicated.

  The present invention has been made in view of such circumstances, and even when end face grooving is performed along the peripheral surface of the work material without increasing the number of parts of the cutting insert, the processing accuracy is improved. It is an object of the present invention to provide a blade replacement type grooving tool and an end face grooving method capable of sufficiently ensuring the above.

In order to achieve the above object, the present invention proposes the following means.
That is, the present invention relates to a cutting insert having a cutting edge protruding toward an end face of a work material that rotates about a rotation axis, and a tool body that has a shaft shape and is detachably attached to the tip portion. And a cutting edge replaceable grooving tool for grooving the end face with the cutting edge, wherein the cutting insert is an upper surface of the insert body at both ends in the extending direction of the rod-shaped insert body. A pair of cutting edges, and rotationally symmetric with respect to the insert height axis passing through the center in the extending direction of the insert body and the center in the width direction orthogonal to the extending direction, and orthogonal to the extending direction and the width direction, and The insert blade is formed in plane symmetry with respect to an imaginary virtual plane including the insert height axis and perpendicular to the extending direction, and the cutting edge is formed at an end edge of the insert body in the extending direction. A front cutting edge extending along the width direction, a pair of corner portions disposed at both ends of the front cutting edge and projecting in the width direction, and a center of the insert body along the extending direction from the corner portion A pair of side cutting edges extending so as to gradually narrow each other as it goes to the side, and the tool body projects one of the pair of cutting edges in the grooving direction. The cutting insert is mounted, and the cutting insert has an insert longitudinal axis along the extending direction passing through the center in the width direction of the insert main body, and at least one of the pair of corner portions in the one cutting edge. together are inclined relative to the vertical tool virtual plane in the vertical direction of the tool body includes a Kano corners, among the extending direction, the pair of cutting edges Characterized in that it extends gradually to approach to the tool virtual plane as it goes definitive to the other one in the extending direction is a direction toward the one cutting edge from the cutting edge.
The present invention also provides a cutting insert having a cutting edge protruding toward an end face of a work material that rotates about a rotation axis, and a tool body that has a shaft shape and is detachably attached to the tip portion. And an edge face grooving method for grooving the end face of the work material with the cutting edge using a cutting edge exchange grooving tool, wherein the cutting insert is an extension of a rod-shaped insert body. A pair of cutting blades are provided on the upper surface of the insert main body at both ends in the existing direction, passing through the center in the extending direction of the insert main body and the center in the width direction orthogonal to the extending direction in the extending direction and the width direction. The insert blade is formed rotationally symmetric with respect to an orthogonal insert height axis, and symmetrical with respect to an insert virtual plane that includes the insert height axis and is perpendicular to the extending direction. A front cutting edge that is formed at an edge in the extending direction of the front edge and extends along the width direction, a pair of corner portions that are arranged at both ends of the front cutting edge and project in the width direction, and the corner portion. A pair of side cutting edges extending so as to gradually narrow each other as it goes toward the center side of the insert body along the extending direction, and the cutting insert is one of the pair of cutting edges. When the cutting edge protrudes in the grooving direction and is attached to the tool body, and when grooving the end face by moving the one cutting edge along the grooving direction, Insert longitudinal axis passing through the center in the width direction of the insert body and extending along the extending direction, at least one of the pair of corner portions in the one cutting edge and the front While tilting with respect to the virtual tool plane including the rotation axis, the direction of extension extends from the other cutting edge of the pair of cutting edges toward the one cutting edge. It gradually extends so as to approach the tool virtual plane.

  According to the edge exchange type grooving tool and the end face grooving method according to the present invention, the insert longitudinal axis of the cutting insert is directed toward one extending direction from the other cutting edge to one cutting edge. Gradually inclined to approach the tool virtual plane. Thereby, for example, in the step portion of the work material having a multi-stage cylindrical shape, the end surface of the work material is grooved along the small-diameter portion parallel to the rotation axis (outer diameter side end face grooving). When it does, there exist the following effects. That is, for example, among the pair of corner portions of one cutting edge of the cutting insert, one corner portion is disposed close to the outer peripheral surface of the small-diameter portion of the work material, and the cutting insert is disposed in the small-diameter portion. When grooving by moving along the part in the grooving direction, one corner part of the pair of cutting edges of the other cutting edge is separated from the small diameter part, and this corner part contacts the small diameter part. It is prevented that it is damaged. Further, the above-described contact prevents the other unused cutting edge from being damaged.

  Further, regardless of the depth d1 of the end surface E of the work material W described in FIG. 12, the one corner portion of the other cutting edge is separated from the peripheral surface of the work material, and this corner portion is the peripheral surface. It is surely prevented that it touches and is damaged.

  In addition, since the pair of corner portions in one cutting edge can be arranged in the same plane perpendicular to the rotation axis, the groove bottom of the groove cut by one cutting edge is formed perpendicular to the rotation axis, thereby processing the groove. The accuracy is sufficiently increased.

  In addition, since the pair of side surface cutting blades provided in each cutting blade is formed to be inclined so as to gradually narrow each other as it goes from the outside in the extending direction of the insert body toward the center side, The side cutting edge is prevented from coming into contact with the groove wall of the groove cut by the corner portion, and the processing accuracy of the groove wall is ensured.

Further, in the cutting edge replaceable grooving tool according to the present invention, when the cutting insert is viewed from the side of the insert body, an angle θ3 formed by the insert longitudinal axis and the tool virtual plane is 0 ° <θ3 ≦ 10. It may be set to °.
Further, in the end face grooving method according to the present invention, when the cutting insert is viewed from the side surface side of the insert body, an angle θ3 formed by the insert longitudinal axis and the virtual tool plane is 0 ° <θ3 ≦ 10 °. It is good also as setting to.

According to the cutting edge-replaceable grooving tool and the end face grooving method according to the present invention, the angle θ3 formed by the insert longitudinal axis and the virtual tool plane is set to exceed 0 °. When the outer peripheral surface of the small-diameter portion is formed in parallel with the rotation axis, the one corner portion of the other cutting edge of the cutting insert is reliably separated from the small-diameter portion outward in the radial direction. The processing accuracy of the part is ensured. Further, by setting the angle θ3 to 10 ° or less, cutting can be stably performed while sufficiently improving the sharpness and edge strength of one of the cutting edges.

Further, in the blade edge replaceable grooving tool according to the present invention, the end surface is formed at a step portion on the outer peripheral surface of the work material, and the one cutting edge is an outer diameter side end surface groove with respect to the end surface. It is good also as carrying out processing.
Further, in the end surface grooving method according to the present invention, the end surface is an end surface facing the base end side of the tool body in the step portion formed on the outer peripheral surface of the work material, and the one cutting edge, The outer diameter side end face grooving may be performed on the end face.

According to the cutting edge-replaceable grooving tool and the end surface grooving method according to the present invention, for example, an end surface that is perpendicular to the rotation axis and faces the tool body side is formed on the step portion of the work material having a multistage cylindrical shape. Even when a small-diameter portion having an outer peripheral surface parallel to the rotation axis is formed adjacent to this end surface, the outer-diameter side end surface grooving with high accuracy is possible regardless of the position of the end surface to be grooved. Can be done.

Further, in the cutting edge exchange-type grooving tool according to the present invention, the tool body has the cutting insert arranged along one side surface facing the side of the tool body, and the one cutting edge is the Projecting in the grooving direction from the distal end surface of the distal end portion toward the distal end side, the central axis of the tool body extends in the grooving direction through the distal end portion, and among the width direction, The cutting insert is the other of the other cutting edges, with a direction from one corner portion located in a direction away from the center axis of the tool body at a pair of corner portions to the other corner portion as the other width direction. One corner portion located on the opposite side to the width direction of the first cutting edge may be further away from the rotation axis than the one corner portion of the one cutting edge.
Further, in the end face grooving method according to the present invention, among the work materials, a direction from one corner portion to the other corner portion in the pair of corner portions as the other width direction among the width directions. The one corner portion of the other cutting edge is connected to the peripheral edge of the one cutting edge with respect to a peripheral surface that rises in the direction of the rotation axis adjacent to the end face and is formed around the rotation axis. The one corner portion located on the opposite side of the other width direction of the other cutting edge is disposed away from the one corner portion cut into the end surface along the surface. It is good also as arrange | positioning away from the said rotating shaft rather than said one corner part in a blade.

According to the cutting edge exchange type grooving tool and the end face grooving method according to the present invention, one corner portion of the other cutting edge is separated from the rotation axis of the work material than one corner portion of the one cutting edge. Has been. Thereby, for example, when an end surface facing the rotation axis direction is formed in the step portion of the work material having a multi-stage columnar shape, and a small-diameter portion having an outer peripheral surface parallel to the rotation axis is formed adjacent to the end surface. In addition, when grooving by placing one corner portion of one cutting edge close to the outer peripheral surface of the small-diameter portion, one corner portion of the other cutting edge is surely secured from this outer peripheral surface. Spaced apart. Therefore, the other cutting edge is prevented from damaging the outer peripheral surface, and the accuracy of the outer diameter side end face grooving is sufficiently ensured.

Moreover, the cutting edge exchange-type grooving tool which concerns on this invention WHEREIN: The said insert longitudinal axis may be extended toward the lower surface side of the said tool main body gradually as it goes to said one extending direction.
In the end face grooving method according to the present invention, the insert longitudinal axis gradually approaches the tool virtual plane from the other cutting edge located above the tool virtual plane toward the one extending direction. It is good also as extending.

According to indexable grooving tool and the end face grooving method according to the present invention, can be set to a large wedge angle of the cutting edge of the hand, it is possible to secure sufficiently the edge strength of the one cutting edge it said.

Further, in the cutting edge replaceable grooving tool according to the present invention, the insert longitudinal axis may be gradually extended toward the upper surface side of the tool body as it goes in the one extending direction.
Further, in the end face grooving method according to the present invention, the insert longitudinal axis is gradually moved from the other cutting edge located on the lower side of the tool imaginary plane to the one tool imaginary plane. It is good also as extending so that it may approach.

According to indexable grooving tool and the end face grooving method according to the present invention, will be cutting edge of hand is cut sharply to the end face of the workpiece is sufficiently enhanced sharpness.

  Moreover, the cutting edge exchange-type grooving tool which concerns on this invention WHEREIN: The said corner part is good also as having the 1st corner blade of a convex curve shape.

  According to the cutting edge exchange-type grooving tool according to the present invention, the corner portion of the cutting edge has the first curved corner portion having a convex curve, so that the cutting edge is not damaged at the corner portion.

Further, in the cutting edge replaceable grooving tool according to the present invention, the corner portion is a linear first connecting the end portion on the center side in the extending direction of the insert body in the first corner blade and the side face cutting blade. The second corner blade has a two-corner blade and extends so as to be parallel to the rotation axis of the work material when the cutting insert is viewed from a direction orthogonal to the tool virtual plane. Also good.
Moreover, in the end surface grooving method according to the present invention, the corner portion includes a convex-curved first corner blade, an end portion on the center side in the extending direction of the insert body in the first corner blade, and the side surface. A linear second corner blade that connects the cutting edge, and when the cutting insert is viewed from a direction orthogonal to the tool virtual plane, the second corner blade is positioned with respect to the rotation axis of the work material. It is good also as extending and arrange | positioning so that it may become parallel.

According to the cutting edge-replaceable grooving tool and the end face grooving method according to the present invention, the corner portion of the cutting edge includes an end portion on the center side along the extending direction of the insert body in the first corner blade and a side cutting blade. Since the 2nd corner blade which connects is extended so that it may become parallel to the axis of rotation of a work material, the groove wall of the work material which the front face cut edge of one of the cut blades and the 1st corner blade cut This second corner blade is exposed, and the finishing accuracy of the groove wall is improved.

  According to the cutting edge replaceable grooving tool and the end face grooving method according to the present invention, even when the end face grooving is performed along the peripheral surface of the work material without increasing the number of parts of the cutting insert. Sufficient machining accuracy can be secured.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view showing a cutting edge replaceable grooving tool according to a first embodiment of the present invention and a work material to be subjected to grooving using this cutting edge replaceable grooving tool. It is the top view which looked at the cutting edge exchange type grooving tool and work material which concern on the 1st Embodiment of this invention from the direction which opposes the rake face of a cutting insert, and is the figure which looked at the cutting insert from the upper surface. is there. It is a schematic side view which shows the blade-tip-exchange-type grooving tool and work material which concern on the 1st Embodiment of this invention. It is the front view which looked at the blade-tip-exchange-type grooving tool which concerns on the 1st Embodiment of this invention from the front end side of the tool main body. It is a perspective view which shows the cutting insert. It is a figure which expands and shows the cutting insert 30 vicinity in FIG. It is a figure which expands and shows the cutting insert 30 vicinity in FIG. It is a schematic side view which shows the blade-tip-exchange-type grooving tool and work material which concern on the 2nd Embodiment of this invention. It is the figure which looked at the cutting insert vicinity of the blade-tip-exchange-type grooving tool which concerns on the 2nd Embodiment of this invention from the front of this cutting insert. It is a figure which shows the modification of the corner part in the cutting blade of a cutting insert. It is a figure which shows the modification of the corner part in the cutting blade of a cutting insert. It is the top view which looked at the conventional cutting edge exchange type grooving tool and work material from the direction which opposes the rake face of a cutting insert, and is the figure which looked at the cutting insert from the upper surface. It is a figure which expands and shows the A section in FIG.

(First embodiment)
FIGS. 1-7 has shown the cutting-edge replacement | exchange grooving tool 10 which concerns on the 1st Embodiment of this invention, and the cutting insert 30 used for this cutting-edge-exchange-type grooving tool 10. FIG. The cutting edge-replaceable grooving tool 10 according to the present embodiment is detachably attached to a tool main body 1 that is formed in an axial shape and has a substantially rectangular cross section, and an end (front end) 3 on the front end side of the tool main body 1. A cutting insert 30 that is mounted and projects a cutting edge 32 from the front end surface 1A of the tool body 1 toward the front end side is provided.

  The cutting edge exchange-type grooving tool 10 of this embodiment performs an outer diameter side end surface grooving process on a substantially cylindrical work material W. Specifically, the work material W of the present embodiment has a multistage cylindrical shape, and has a stepped portion U between the large diameter portion and the small diameter portion. The stepped portion U of the work material W is formed with an end surface E that is formed of an annular surface that is adjacent to the outer peripheral surface R of the small-diameter portion and is orthogonal to the rotational axis WO. The cutting edge-replaceable grooving tool 10 rotates around the rotation axis WO in a state where the extending direction (X direction shown in the figure) of the tool body 1 is arranged substantially parallel to the rotation axis WO of the work material W. The tip 3 of the tool body 1 is directed to the stepped portion U of the work W rotating in the direction WT, the cutting edge 32 is moved along the outer peripheral surface R of the small diameter portion of the stepped U, and the end surface E is moved. To cut. In the present embodiment, symbols X, Y, and Z indicating directions are used in some of the drawings. Here, symbols X and Y respectively indicate horizontal directions. Specifically, the X direction indicates the horizontal direction parallel to the rotation axis WO of the work material W, and the Y direction indicates the horizontal direction perpendicular to the rotation axis WO. Show. Moreover, the code | symbol Z has shown the perpendicular direction.

  The tool main body 1 is formed from a steel material or the like, and a central portion and a base end portion other than the tip end portion 3 form a substantially rectangular parallelepiped shape to form a shank portion 2. The blade edge exchange type grooving tool 10 is fixedly supported by the machine tool M indicated by a two-dot chain line in FIG. 4 by being held in a state where the shank portion 2 is prevented from rotating. In the following description, in the X direction, the distal end side (lower side in FIG. 2) of the tool body 1 may be referred to as one side, and the proximal end side (upper side in FIG. 2) may be referred to as the other side.

  The tip portion 3 of the tool body 1 has a substantially pentagonal shape in plan view of FIG. 2, and an upper jaw portion 6 and a lower jaw portion 7 are formed so as to protrude from the tip face 1 </ b> A toward the tip side. The upper jaw portion 6 and the lower jaw portion 7 of the distal end portion 3 are opposed to each other in the vertical direction (Z direction), and in the distal end surface 1A, the direction perpendicular to the rotation axis WO (Y direction in FIG. 2) It is formed at the end of one side (left side in FIG. 2). As shown in FIG. 3, the upper surface 3 </ b> A of the distal end portion 3 is formed so as to protrude upward from the upper surface of the shank portion 2. Further, the lower surface 3B of the distal end portion 3 of the tool body 1 is flush with the lower surface 2B of the shank portion 2 from the base end portion to the central portion, and the distal end portion is recessed by one step from the lower surface 2B. .

  Further, the tool body 1 has a side surface 3C facing the one side out of both side surfaces facing the side (Y direction in FIG. 2) at the tip portion 3, and a side surface (one side surface) facing the one side in the shank portion 2. ) It is continuous with 2C and forms side surfaces of the upper jaw 6 and the lower jaw 7 facing the one side. Specifically, the one side surface 3C is formed so that the base end portion thereof is planar and is continuous with the one side surface 2C of the shank portion 2, and the distal end portion thereof is curved in a concave curve shape. . In addition, the distal end portion 3 is formed with another side surface 3D that faces the other side of the both side surfaces (the right side in the Y direction in FIG. 2) and faces away from the one side surface 3C. The other side surface 3D of the distal end portion 3 is flush with the side surface (other side surface) 2D whose base end portion faces the other side in the shank portion 2, and from the central portion toward the distal end portion, as it goes toward the distal end side. The taper is formed so as to be gradually inclined toward the one side. In addition, the shape of the front-end | tip part 3 of the tool main body 1 mentioned above is an example, and is not limited to this embodiment.

  As shown in FIG. 4, the cutting edge-replaceable grooving tool 10 includes the machine tool 1 in a state where at least the lower surface 2B and the other side surface 2D of the shank portion 2 of the tool body 1 are in contact with the mounting recess m of the machine tool M. Supported by M. Note that the lower surface 3B and the other side surface 3D of the tip 3 of the tool body 1 may not be supported by the mounting recess m.

  Further, the portion corresponding to the upper jaw portion 6 of the tip portion of the one side surface 3C is formed to be curved in a cross-sectional concave curve so as to gradually go to the other side surface 3D side from the upper surface 3A toward the lower surface 3B. Further, the side surface facing the other side surface 3D side in the upper jaw portion 6 is formed to be curved in a convex curve shape so as to gradually go to the other side surface 3D side from the upper surface 3A toward the lower surface 3B. In addition, the portion corresponding to the lower jaw portion 7 of the tip portion of the one side surface 3C is formed to be curved in a concave concave section so as to gradually go to the one side surface 3C side from the upper surface 3A toward the lower surface 3B. Further, the side surface facing the other side surface 3D side of the lower jaw 7 is formed to be curved in a convex curve shape so as to gradually move toward the one side surface 3C side from the upper surface 3A toward the lower surface 3B. In the front view of FIG. 4, the upper jaw portion 6 and the lower jaw portion 7 are formed in a generally arcuate shape as a whole.

  In the side view of FIG. 3, the upper jaw portion 6 of the distal end portion 3 has a substantially triangular shape, and the upper surface of the upper jaw portion 6 is formed so as to be gradually inclined toward the lower surface 3B side from the proximal end side toward the distal end side. . Further, in this side view, the lower jaw portion 7 is formed in a substantially rectangular shape. The lower jaw portion 7 protrudes toward the distal end side of the tool body 1 from the upper jaw portion 6. A gap is provided between the upper jaw portion 6 and the lower jaw portion 7 to form an insert mounting seat 4 to which the cutting insert 30 is detachably mounted. The tool body 1 has a cutting insert 30 mounted on the insert mounting seat 4 and is disposed along the one side surface 3 </ b> C facing the side of the tool body 1.

  The insert mounting seat 4 has a substantially rectangular parallelepiped hole shape, is located on the side surface 3C side of the tip portion 3, and extends along the X direction. The insert mounting seat 4 has a distal end portion and a central portion located between the upper jaw portion 6 and the lower jaw portion 7 and opened on both sides in the Y direction. Moreover, the front-end | tip part of the insert mounting seat 4 is opened also in the direction (grooving direction XA mentioned later) which faces a front end side among X directions. Further, the base end portion of the insert mounting seat 4 is located between the upper surface 3A and the lower surface 3B and is open to the one side surface 3C. The insert mounting seat 4 is formed so as to be gradually inclined from the upper surface 3A toward the lower surface 3B as it goes from the proximal end side to the distal end side of the tool body 1. In addition, a stepped portion 4 </ b> A facing the distal end side of the tool body 1 is formed at the base end portion of the insert mounting seat 4.

  Further, on the base end side of the insert mounting seat 4, a tightening portion 8 is formed which has a slit shape narrower than the insert mounting seat 4 and opens to the front end surface 1A, one side surface 3C and the other side surface 3D. . The tightening portion 8 is formed so as to be gradually inclined from the upper surface 3A to the lower surface 3B as it goes from the proximal end side to the distal end side of the tool body 1.

  Further, the top wall surface 4B and the bottom wall surface 4C facing the top and bottom in the insert mounting seat 4 are each formed in a convex V shape when viewed from the front end surface 1A side, as shown in FIG. Further, as shown in FIG. 3, the tightening portion 8 is formed so that the space between the top wall surface 4 </ b> D and the bottom wall surface 4 </ b> E is narrow with respect to the insert mounting seat 4. A through-hole 5A is formed in the top wall surface 4D of the tightening portion 8 so as to open to the upper surface 3A of the distal end portion 3 and through which the clamp screw 5 is inserted. The bottom wall surface 4E of the tightening portion 8 is formed with a screw hole (not shown) that is coaxial with the through hole 5A and is subjected to female threading on the inner peripheral surface.

  Further, the cutting insert 30 to be mounted on the blade replacement type grooving tool 10 is made of a hard material such as cemented carbide, and as shown in FIG. 3, the extending direction of the rod-shaped insert body 31 (in FIG. 3). This is a so-called dogbone type cutting insert provided with a pair of cutting edges 32 on the upper surface (the surface facing the right side in FIG. 3) of the insert main body 31 at both ends in the vertical direction.

  Here, reference sign C1 shown in FIG. 5, FIG. 6, etc. indicates the insert longitudinal axis along the extending direction of the insert body 31, and this insert longitudinal axis C <b> 1 is orthogonal to the extending direction in the insert body 31. While passing through the center in the width direction, the pair of cutting edges 32 extend through the center of front cutting edges 41 and 41, which will be described later. Further, symbol C2 indicates an insert width axis along the width direction of the insert body 31, and the insert width axis C2 is the center of the insert body 31 along the insert longitudinal axis C1 (part indicated by a double circle in the drawing). ), And extends in parallel to the front cutting edge 41 while being orthogonal to the insert longitudinal axis C1. Reference symbol C3 indicates an insert height axis along the height direction of the insert main body 31, and the insert height axis C3 passes through the center of the insert main body 31, and the insert longitudinal axis C1 and the insert width axis C2. Extend in directions orthogonal to each other.

  The cutting insert 30 is formed symmetrically (that is, plane-symmetric) with respect to the insert virtual plane VS1 that passes through the center of the insert body 31 along the insert longitudinal axis C1 and is perpendicular to the insert longitudinal axis C1. The cutting insert 30 includes an insert longitudinal axis C1 and an insert height axis C3, and includes an upper surface (a surface facing upward in the vertical direction (Z direction) in FIG. 4) and a lower surface (Z direction in FIG. 4). The imaginary insert imaginary plane VS2 passing through the center of each of the surfaces is also symmetrical (plane symmetry). That is, the cutting insert 30 is formed rotationally symmetric with respect to the insert height axis C3. The cutting insert 30 may not be formed symmetrically with respect to the insert virtual plane VS2.

  As shown in FIGS. 5 and 7, the cutting insert 30 has a concave V-shaped cross section in which the central portion and the lower surface in the extending direction on the upper surface of the insert body 31 are orthogonal to the insert longitudinal axis C <b> 1. Is formed. With such a shape of the insert main body 31, the cutting insert 30 is guided so as to be in sliding contact with the top wall surface 4B and the bottom wall surface 4C at the portion where the insert mounting seat 4 opens to the tip side, and from the one side to the other side. Inserted.

  As shown in FIG. 3, the cutting insert 30 inserted into the insert mounting seat 4 is positioned by abutting the end surface on the other side of the insert body 31 against the stepped portion 4 </ b> A. By tightening the clamp screw 5 in this state, the top wall surface 4D of the tightening portion 8 approaches while being elastically deformed toward the bottom wall surface 4E, and the top wall surface 4B of the insert mounting seat 4 is elastically deformed toward the bottom wall surface 4C. While approaching. Thus, the space | interval of top wall surface 4D, 4B and bottom wall surface 4E, 4C is narrowed, and the cutting insert 30 is fixedly supported by the front-end | tip part 3 of the tool main body 1. FIG.

  In addition, a pair of cutting edges 32 are disposed at both ends along the insert longitudinal axis C <b> 1 direction on the upper surface of the insert body 31. As shown in FIG. 6, the cutting edge 32 is a linear front cutting edge that is formed at the end edge of the insert body 31 in the extending direction and extends in the width direction (left-right direction in FIG. 6) perpendicular to the extending direction. 41, a pair of corner portions 43 disposed at both ends of the front cutting edge 41 and projecting in the width direction, and the center side (inside) of the insert main body 31 along the extending direction from these corner portions 43 A pair of side-faced cutting edges 42 each extending linearly so as to gradually narrow the distance from each other as it goes to.

  Specifically, the pair of side surface cutting edges 42 are formed so as to be inclined from the outer side in the width direction toward the central side (inner side) gradually from the outer side in the extending direction of the insert body 31 toward the central side. A back taper is given.

  Further, the both end portions on the upper surface of the insert main body 31 are made to recede by one step from the central portion and have a substantially square shape, respectively, and form a pair of rake surfaces 33. The rake face 33 has a front cutting edge 41 and a pair of side cutting edges 42 on its outer peripheral edge other than the central side in the extending direction.

  Further, in FIG. 5, the peripheral surface connecting the upper surface and the lower surface of the outer surface of the insert body 31 has a front flank 51 connected to the front cutting edge 41 and a pair of side flank surfaces connected to a pair of side cutting edges 42. 52 is formed. The front flank 51 is formed to be inclined so as to gradually recede from the outer surface of the insert body 31 as it goes from the front cutting edge 41 toward the lower surface. Further, the side flank 52 is formed to be inclined so as to gradually recede from the outer surface of the insert body 31 as it goes from the side cutting edge 42 to the lower surface side. In the following description, the surface of the insert body 31 on which the front clearance surface 51 is formed is referred to as the front surface of the cutting insert 30, and the surface of the insert body 31 on which the side clearance surface 52 is formed is referred to as the side surface of the cutting insert 30.

  When the cutting insert 30 is mounted on the insert mounting seat 4 of the tool body 1, as shown in FIG. 2, the cutting edge 32 </ b> A is formed on the one side (the lower side in the X direction in FIG. 2) of the pair of cutting edges 32. The cutting edge 32B is disposed on the other side (upper side in the X direction in FIG. 2). One cutting edge 32A protrudes from the tip surface 1A of the tip portion 3 of the tool body 1 toward the tip side and is disposed opposite to the end surface E of the work material W, and the end surface E is grooved. It has come to give. Specifically, the tool body 1 projects one cutting edge 32A of the pair of cutting edges 32 from the distal end surface 1A of the distal end portion 3 toward the grooving direction indicated by the symbol XA in the X direction, A cutting insert 30 is attached.

  2 and 4 to 7, the direction indicated by C2A is the work material in the pair of corner portions 43A and 43B (43C and 43D) in the width direction of the insert body 31 (in the direction of the insert width axis C2). The other width direction, which is a direction from one corner portion 43A (43C) located on the outer peripheral surface R side in the small diameter portion of W to the other corner portion 43B (43D) located on the opposite side to the outer peripheral surface R side Is shown. In the top view of FIG. 2, the insert width axis C2 of the cutting insert 30 and the front cutting edge 41 of the cutting edge 32A are perpendicular to the rotation axis WO. 4 and 7, the front cutting edge 41 of one cutting edge 32A extends perpendicularly to the rotation axis WO so as to follow the radial direction of the work material W. That is, in the cutting insert 30, the corner portion 43 </ b> A and the corner portion 43 </ b> B located at both ends of the front cutting edge 41 in the cutting edge 32 </ b> A are arranged in the same plane perpendicular to the rotation axis WO.

  Here, what is indicated by reference sign VS3 in FIGS. 3 and 4 represents a tool virtual plane including the corner portions 43A and 43B of the cutting edge 32A and the rotation axis WO. Note that the tool virtual plane VS3 only needs to be formed so as to include at least one of the corner portions 43A and 43B of the pair of cutting edges 32A and the rotation axis WO, and both corners as in the present embodiment. It is not limited to what contains the parts 43A and 43B. That is, in the front view of FIG. 4, the insert width axis C2 of the cutting insert 30 and the front cutting edge 41 of the cutting edge 32A are gradually rotated as they are separated from the outer peripheral surface R of the small diameter portion in the other width direction C2A. You may incline toward the front side or the back side of the direction WT. In the present embodiment, the tool virtual plane VS3 is arranged in the XY horizontal plane.

  However, when the insert width axis C2 of the cutting insert 30 and the front cutting edge 41 of the cutting edge 32A are inclined toward the front side or the rear side in the rotational direction WT as described above, the corner portion 43A of the cutting edge 32A is formed. 43B are not arranged in the same plane perpendicular to the rotation axis WO, and the groove bottom D of the groove to be processed cannot be formed perpendicular to the rotation axis WO. Therefore, as in this embodiment, the front cutting edge 41 of one cutting edge 32A extends perpendicularly to the rotation axis WO so as to follow the radial direction of the work material W in the front view of FIG. It is preferable that the corner part 43A and the corner part 43B located at both ends of the front cutting edge 41 are arranged at the same position along the rotation direction WT.

  2 and 3, the direction indicated by the reference symbol C1A is one cutting edge from the other cutting edge 32B of the pair of cutting edges 32A and 32B in the extending direction of the insert body 31 (in the direction of the insert longitudinal axis C1). One extending direction which is a direction toward 32A is shown. Here, FIG. 2 is a top view of the cutting insert 30 as viewed from a direction orthogonal to the tool virtual plane VS3. In this top view, the other cutting edge 32B is positioned on the side opposite to the other width direction C2A. The virtual straight line passing through the corner portion 43C to be cut and the corner portion 43A located on the opposite side of the one cutting edge 32A extends so as to overlap the outer peripheral surface R of the small diameter portion of the work material W, and the rotation axis Parallel to WO. The insert width axis C2 of the cutting insert 30 extends perpendicularly to the rotation axis WO of the work material W.

  In addition, in the top view of FIG. 2, the imaginary straight line may be inclined with respect to the rotation axis WO. Specifically, in this top view, the cutting insert 30 is moved so that the virtual straight line is gradually separated from the rotation axis WO as it goes from the cutting edge 32A side (the one side) toward the cutting edge 32B side (the other side). It may be slightly inclined with respect to the rotation axis WO. However, in this case, the corner portions 43A and 43B of the cutting edge 32A may not be disposed in the same plane orthogonal to the rotation axis WO, and the groove bottom D of the groove to be processed may not be formed perpendicular to the rotation axis WO. .

  FIG. 3 is a side view of the tool body 1 viewed from the side surface 3C side and the cutting insert 30 viewed from the side surface side of the insert body 31. In this side view, the insert longitudinal axis C1 of the cutting insert 30 is the tool Inclined with respect to the virtual plane VS3, and gradually extends toward the tool virtual plane VS3 toward the one extending direction C1A. Specifically, the insert longitudinal axis C1 of the cutting insert 30 gradually moves from the upper surface side (right side in the left-right direction (Z direction) in FIG. 3) to the lower surface side (in FIG. 3) as it goes in the one extending direction C1A. It extends toward the left side in the Z direction. Thereby, the front cutting edge 41 of the cutting edge 32B is spaced apart from the tool virtual plane VS3 toward the upper surface side of the insert main body 31 (the right side in the Z direction in FIG. 3). 3, the angle θ3 formed by the insert longitudinal axis C1 passing through the front cutting edges 41 and 41 of the cutting edges 32A and 32B and the virtual tool plane VS3 is within the range of 0 ° <θ3 ≦ 10 °. Is set to The angle θ3 is more preferably set within a range of 0.5 ° ≦ θ3 ≦ 5 °. In the present embodiment, this θ3 is set to about 3 °, for example.

  In other words, in the cutting insert 30, one corner portion 43C of the other cutting edge 32B is separated from the tool virtual plane VS3 toward the upper surface side of the insert body 31 than the one corner portion 43A of the one cutting edge 32A. ing. Thereby, in FIG.6 and FIG.7, the corner part 43C of the cutting edge 32B is arrange | positioned in the radial direction outward of the workpiece W rather than the corner part 43A of the cutting edge 32A, and is spaced apart from the rotating axis WO, It is separated from the outer peripheral surface R of the small diameter portion. In the top view of FIG. 6, the corner portion 43C of the cutting edge 32B is actually positioned so as to overlap the outer peripheral surface R. For convenience of explanation, the corner portion 43C is shown as being separated from the outer peripheral surface R. Yes.

  Further, the cutting insert 30 attached to the tool body 1 gradually moves from the other side where the cutting edge 32B is arranged toward the one side where the cutting edge 32A is arranged toward the one extending direction C1A. 1 is inclined to the lower surface 3B.

  In the present embodiment, the cutting insert 30 of the tool body 1 having the above-described configuration is disposed close to the corner portion 43A of one of the cutting edges 32A so as to contact the outer peripheral surface R of the small diameter portion of the work material W. In this state, the cutting edge 32A moves in the grooving direction XA toward the tip end side of the tool body 1 along the outer peripheral surface R in parallel with the rotation axis WO, so that the cutting edge 32A has an outer diameter side end surface with respect to the end surface E of the stepped portion U Grooving.

  As described above, according to the cutting edge replaceable grooving tool 10 and the end face grooving method using the same according to the present embodiment, the insert longitudinal axis C1 of the cutting insert 30 is moved from the other cutting edge 32B to one of the cutting edges 30B. It is inclined so as to gradually approach the tool virtual plane VS3 toward one extending direction C1A that is a direction toward the cutting edge 32A. Specifically, the insert longitudinal axis C1 gradually extends toward the lower surface side of the insert main body 31 as it goes in the one extending direction C1A, and the other side of the tool virtual plane VS3 including the one cutting edge 32A is the other. The cutting edge 32 </ b> B is separated toward the upper surface side of the insert body 31. Thereby, as in the present embodiment, in the stepped portion U of the workpiece W having a multistage cylindrical shape, the end surface E of the workpiece W along the small diameter portion having the outer peripheral surface R parallel to the rotation axis WO. When performing grooving processing (outer diameter side end surface grooving), the following effects are obtained.

  That is, among the pair of corner portions 43A, 43B in the one cutting edge 32A of the cutting insert 30, the one corner portion 43A is disposed close to the outer peripheral surface R of the small diameter portion of the work material W, When the cutting insert 30 is moved in the grooving direction XA along the outer peripheral surface R of the small diameter portion and grooving is performed, one corner portion 43C of the pair of cutting edges 43C and 43D in the other cutting edge 32B is The corner portion 43C is prevented from coming into contact with the small diameter portion and being damaged by being separated from the small diameter portion (outer peripheral surface R). Further, the above-mentioned contact prevents the other unused cutting edge 32B from being damaged.

  Further, regardless of the depth d1 of the end surface E of the work material W shown in FIG. 2, one corner portion 43C of the other cutting edge 32B is separated from the outer peripheral surface R of the work material W, and this corner portion 43C. Is reliably prevented from coming into contact with the outer peripheral surface R and being damaged.

  Further, since the pair of corner portions 43A and 43B in the one cutting edge 32A can be arranged in the same plane perpendicular to the rotation axis WO, the groove bottom D of the groove cut by the one cutting edge 32A is perpendicular to the rotation axis WO. The groove processing accuracy is sufficiently enhanced.

  Further, the pair of side surface cutting edges 42, 42 provided in each of the cutting edges 32A, 32B are formed to be inclined so as to gradually narrow each other as they go from the outside in the extending direction of the insert body 31 toward the center side. Therefore, the side cutting edge 42 is prevented from coming into contact with the groove wall of the groove cut by the front cutting edge 41 and the corner portion 43, and the processing accuracy of the groove wall is ensured.

  Further, when the cutting insert 30 is viewed from the side surface side of the insert main body 31, the angle θ3 formed by the insert longitudinal axis C1 along the extending direction of the insert main body 31 and the tool virtual plane VS3 is 0 ° <θ3 ≦ 10 °. It is set within the range. In the present embodiment, since the outer peripheral surface R of the small-diameter portion of the work material W is formed in parallel with the rotation axis WO, the angle θ3 is set to exceed 0 °, so that the other of the cutting inserts 30 is provided. One corner portion 43C of the cutting edge 32B is reliably separated from the small diameter portion outward in the radial direction, and the processing accuracy of the small diameter portion is ensured. Further, by setting the angle θ3 to be 10 ° or less, the cutting insert 30 allows the wedge angle β (an angle formed by the rake face 33 and the front flank 51 in FIG. 3) of one of the cutting edges 32A to be relatively long. The cutting process can be performed stably while the blade edge strength of the cutting edge 32A is sufficiently secured by setting it large.

  In addition, when the angle θ3 is set within the range of 0.5 ° ≦ θ3 ≦ 5 °, the above-described effects can be obtained more reliably. That is, by setting the angle to 0.5 ° or more, the corner portion 43C of the cutting edge 32B is more reliably separated from the outer peripheral surface R. Moreover, the sharpness of the cutting edge 32A can be ensured by setting the angle θ3 to 5 ° or less.

  4 and 7, when the insert width axis C2 of the cutting insert 30 and the front cutting edge 41 of the cutting edge 32A move away from the outer peripheral surface R toward the other width direction C2A, the rotation direction gradually increases. When it is formed to be inclined toward the front side of the WT, the chips generated by cutting one of the cutting edges 32A to the outside (radially outward) of the stepped portion U opposite to the outer peripheral surface R. Therefore, chips are prevented from damaging the outer peripheral surface R, and the discharge performance is improved. Further, the insert width axis C2 of the cutting insert 30 and the front cutting edge 41 of the cutting edge 32A are gradually inclined toward the rear side in the rotational direction WT as they are separated from the outer peripheral surface R toward the other width direction C2A. If formed, the component force of the cutting resistance received by one of the cutting edges 32A during cutting acts to press the other side 2D of the tool body 1 against the machine tool M. As a result, the position of the cutting edge-replaceable grooving tool 10 with respect to the machine tool M at the time of cutting is stabilized, and highly accurate cutting can be performed stably.

  In this way, in the outer diameter side end face grooving using the above-described blade edge replaceable grooving tool 10, the tool main body 1 is perpendicular to the rotation axis WO at the stepped portion U of the workpiece W having a multistage cylindrical shape. An end face E facing the base end side of the end face E is formed, and even if the small diameter portion having the outer peripheral face R parallel to the rotation axis WO is formed adjacent to the end face E, the position of the end face E to be grooved Regardless of this, the outer diameter side end face grooving can be performed with high accuracy.

(Second Embodiment)
Next, the cutting edge exchange-type grooving tool 20 according to the second embodiment of the present invention will be described with reference to FIGS. 8 and 9. In addition, the same code | symbol is attached | subjected to the same member as above-mentioned embodiment, and the description is abbreviate | omitted.

  FIG. 8 is a side view of the cutting tool 30 as viewed from the side surface side of the insert body 31 while the tool body 1 of the cutting edge replacement type grooving tool 20 according to the present embodiment is viewed from the side surface 3C side. In the side view of FIG. 8, the insert longitudinal axis C1 of the cutting insert 30 is inclined with respect to the tool imaginary plane VS3, and gradually approaches the tool imaginary plane VS3 toward the one extending direction C1A. It extends. Specifically, the insert longitudinal axis C1 of the cutting insert 30 gradually increases from the lower surface side (left side in the left-right direction (Z direction) in FIG. 8) to the upper surface side (in FIG. 8) as it goes in the one extending direction C1A. Extending to the right in the Z direction). Thereby, the front cutting edge 41 of the cutting edge 32B is separated toward the lower surface side (left side in the Z direction in FIG. 8) of the insert main body 31 with respect to the tool virtual plane VS3. In the side view of FIG. 8, the angle θ3 formed by the insert longitudinal axis C1 and the tool virtual plane VS3 is set within the range of 0 ° <θ3 ≦ 10 °. The angle θ3 is more preferably set within a range of 0.5 ° ≦ θ3 ≦ 5 °. In the present embodiment, this θ3 is set to about 3 °, for example.

  In other words, in this cutting insert 30, one corner portion 43C of the other cutting edge 32B is separated to the lower surface side of the insert main body 31 with respect to the tool virtual plane VS3 than the one corner portion 43A of one cutting edge 32A. ing. Accordingly, in FIG. 9, the corner portion 43C of the cutting edge 32B is disposed radially outward of the work material W with respect to the corner portion 43A of the cutting edge 32A, and is separated from the outer peripheral surface R of the small diameter portion. ing. Further, the cutting insert 30 attached to the tool body 1 gradually moves from the other side where the cutting edge 32B is arranged toward the one side where the cutting edge 32A is arranged toward the one extending direction C1A. 1 is arranged so as to be inclined toward the upper surface 3A.

  According to the cutting edge replaceable grooving tool 20 of the present embodiment, the insert longitudinal axis C1 of the cutting insert 30 is directed from the other cutting edge 32B toward the one cutting edge 32A toward the one extending direction C1A. It is inclined so as to gradually approach the tool virtual plane VS3. Specifically, the insert longitudinal axis C1 gradually extends toward the upper surface side of the insert body 31 as it goes in the one extending direction C1A, and the other cutting edge 32B is inserted into the insert body 31 with respect to the virtual tool plane VS3. It is spaced apart toward the lower surface side. Thereby, one cutting edge 32A will cut sharply with respect to the end surface E of the work material W, and sharpness can fully be improved.

  Specifically, when the angle θ3 is set within the range of 0 ° <θ3 ≦ 10 °, the following operational effects are obtained. That is, when the angle θ3 is set to exceed 0 °, one corner portion 43C of the other cutting edge 32B of the cutting insert 30 is reliably separated from the small diameter portion outward in the radial direction. The processing accuracy of the part is ensured. Further, by setting the angle θ3 to 10 ° or less, the cutting insert 30 can ensure the cutting edge strength while sufficiently increasing the sharpness of the one cutting edge 32A.

  Note that when the angle θ3 is set to 0.5 ° ≦ θ3 ≦ 5 °, the above-described effects can be obtained more reliably. That is, by setting the angle to 0.5 ° or more, the corner portion 43C of the cutting edge 32B is more reliably separated from the outer peripheral surface R. Further, by setting the angle θ3 to 5 ° or less, the wedge angle β of one of the cutting edges 32A can be secured, and the cutting edge strength of the cutting edge 32A can be increased.

In addition, this invention is not limited to the above-mentioned embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, in the above-described embodiment, the insert mounting seat 4 is formed at the tip 3 of the tool body 1. However, the present invention is not limited to this, and a detachable head is attached to the tip 3. In addition, the insert mounting seat 4 may be formed on the head portion. Moreover, the shape of the tool main body 1 described above is not limited to that described in the above embodiment.

  Further, the pair of corner portions 43 of the cutting edge 32 is not limited to the shape described in the above embodiment. 10 and 11 show a modified example of the corner portion 43. In FIG. 10, the corner portion 43 has a convex curve shape and includes a first corner blade 44 that smoothly connects the front cutting edge 41 and the side cutting edge 42. The corner portion 43A of the one cutting edge 32A is directed from the extension line VL1 of the front cutting edge 41 adjacent to the corner portion 43A to the extension line VL1 from the outer edge portion of the insert body 31 in the first corner blade 44 in the width direction. An intersection point P with the extended vertical line VL2 is arranged on the tool virtual plane VS3. Although not shown, the corner portion 43B extends from the extension line of the front cutting edge 41 adjacent to the corner portion 43B and the outer edge portion in the width direction of the insert body 31 at the first corner blade 44 of the corner portion 43B to the extension line. The intersection with the perpendicular extending toward the center is arranged on the tool virtual plane VS3. In this case, chipping of the edge of each corner portion 43 is prevented.

  In FIG. 11, the corner portion 43 includes a first corner blade 44, an end portion on the center side (upper side in FIG. 11) along the extending direction of the insert body 31 in the first corner blade 44, and a side cutting blade. And a second corner blade 45 having a linear shape that connects the first and second corner blades 42 to each other. The second corner blade 45 extends so as to be parallel to the rotation axis WO of the work material W when the cutting insert 30 is viewed from a direction orthogonal to the tool virtual plane VS3, and the outer peripheral surface of the small diameter portion. It extends in parallel with R. In this case, the second corner blade 45 exposes the groove wall of the work material W cut by the front cutting edge 41 and the first corner blade 44 of the one cutting edge 32A, and the finishing accuracy of the groove wall is increased. It is done.

  In the above-described embodiment, the cutting edge 32A of the cutting insert 30 is grooved into the end surface E along the outer peripheral surface R of the small diameter portion of the work material W. However, the present invention is not limited to this. is not. For example, the end surface E portion separated from the outer peripheral surface R of the small diameter portion of the work material W may be grooved. According to the embodiment of the present invention, high-precision cutting can be performed regardless of whether the end surface E portion adjacent to the small-diameter portion of the work material W or the separated end surface E portion is grooved. it can.

1 Tool body
1A Tip surface 3 Tip
3C One side face 10, 20 Cutting edge exchange type grooving tool 30 Cutting insert 31 Insert body 32 Cutting edge 32A One cutting edge 32B The other cutting edge 41 Front cutting edge 42 Side cutting edge 43 Corner portion 43A The other cutting edge in the other cutting edge One corner portion 43B located on the opposite side to the width direction C2A 43C One corner portion located on the other width direction C2A side of the other cutting edge 43C The other edge portion located on the opposite side of the other width direction C2A One corner part 43D The other corner part located on the other width direction C2A side in the other cutting edge 44 First corner blade 45 Second corner blade C1 Insert longitudinal axis (extending direction of the insert body)
C1A One extending direction, which is a direction from the other cutting edge toward one cutting edge in the extending direction of the insert main body C2 Insert width axis (width direction of the insert main body)
C3 insert height axis (height direction of the insert body)
E End face R Workpiece outer peripheral surface (peripheral surface)
TO Center axis U of tool body Stepped portion VS1 Insert virtual plane VS3 Tool virtual plane W Work material WO Work material rotation axis XA Grooving direction
Z Vertical direction θ3 Angle formed by insert longitudinal axis and tool imaginary plane in side view of cutting insert

Claims (15)

A cutting insert having a cutting edge projecting toward an end surface of a work material that rotates about a rotation axis, and a tool body that has a shaft shape, and the cutting insert is detachably attached to a tip portion. , A cutting edge replaceable grooving tool for grooving the end face with the cutting edge,
The cutting insert includes a pair of cutting edges on the upper surface of the insert body at both ends in the extending direction of the rod-shaped insert body, and the width direction perpendicular to the center of the insert body and the extending direction Are formed rotationally symmetric with respect to the insert height axis perpendicular to the extending direction and the width direction through the center of the insert, and plane symmetric with respect to the insert virtual plane that includes the insert height axis and is perpendicular to the extending direction.
The cutting edge is formed at an edge of the insert body in the extending direction and extends along the width direction, and a pair of cutting edges disposed at both ends of the front cutting edge and projecting in the width direction. A corner portion, and a pair of side cutting edges each extending so as to gradually narrow the distance from each other toward the center side of the insert body along the extending direction from the corner portion,
The tool body has one cutting edge of the pair of cutting edges protruding toward the grooving direction, and the cutting insert is mounted,
The cutting insert includes an insert longitudinal axis that passes through the center in the width direction of the insert body and extends along the extending direction, and includes at least one of the pair of corner portions of the one cutting edge. One extending direction which is inclined with respect to the virtual tool plane perpendicular to the vertical direction and is the direction from the other cutting edge to the one cutting edge in the pair of cutting edges. The cutting edge exchange type grooving tool, which extends so as to gradually approach the tool virtual plane as it goes to. It is a blade exchange type grooving tool according to claim 1,
When the cutting insert is viewed from the side of the insert body, an angle θ3 formed by the insert longitudinal axis and the tool virtual plane is set to 0 ° <θ3 ≦ 10 °. Insert tool. It is a blade exchange type grooving tool according to claim 1 or 2,
The end surface is formed at a step portion on the outer peripheral surface of the work material,
The one of the cutting edges is an edge diameter side end grooving process with respect to the end face. It is a cutting edge exchange type grooving tool as described in any one of Claims 1-3,
In the tool body, the cutting insert is disposed along one side surface facing the side of the tool body, and the one cutting edge is directed from the tip surface of the tip part toward the tip side. Protruding in the direction,
The center axis of the tool body extends in the grooving direction through the tip.
Among the width directions, a direction from one corner portion positioned in a direction away from the center axis of the tool body in the pair of corner portions to the other corner portion is defined as the other width direction, and the cutting insert is The cutting edge characterized in that one corner portion of the other cutting edge located on the opposite side to the other width direction is separated from the rotation axis rather than the one corner portion of the one cutting edge. Replaceable grooving tool. It is a cutting edge exchange-type grooving tool as described in any one of Claims 1-4,
The insert longitudinal grooving tool is characterized in that the insert longitudinal axis gradually extends toward the lower surface side of the tool body as it goes in the one extending direction. It is a cutting edge exchange-type grooving tool as described in any one of Claims 1-4,
The insert longitudinal grooving tool characterized in that the insert longitudinal axis gradually extends toward the upper surface side of the tool body as it goes in the one extending direction. It is a cutting edge exchange type grooving tool as described in any one of Claims 1-6,
The corner portion has a convex-curved first corner blade, wherein the cutting edge exchange type grooving tool is provided. The cutting edge replacement type grooving tool according to claim 7,
The corner portion has a linear second corner blade that connects the end portion on the center side in the extending direction of the insert body in the first corner blade and the side surface cutting blade,
When the cutting insert is viewed from a direction orthogonal to the tool virtual plane, the second corner blade extends so as to be parallel to the rotation axis of the work material. Insert tool. A cutting edge having a cutting insert having a cutting edge projecting toward an end face of a work material that rotates about a rotation axis, and a tool body that has an axial shape and the cutting insert is detachably attached to a tip portion Using an exchange-type grooving tool, an end face grooving method for grooving the end face of the work material with the cutting edge,
The cutting insert includes a pair of cutting edges on the upper surface of the insert body at both ends in the extending direction of the rod-shaped insert body, and the width direction perpendicular to the center of the insert body and the extending direction Are formed rotationally symmetric with respect to the insert height axis perpendicular to the extending direction and the width direction through the center of the insert, and plane symmetric with respect to the insert virtual plane that includes the insert height axis and is perpendicular to the extending direction.
The cutting edge is formed at an edge of the insert body in the extending direction and extends along the width direction, and a pair of cutting edges disposed at both ends of the front cutting edge and projecting in the width direction. A corner portion, and a pair of side cutting edges each extending so as to gradually narrow the distance from each other toward the center side of the insert body along the extending direction from the corner portion,
The cutting insert is mounted on the tool body with one of the pair of cutting edges projecting in the grooving direction, and the one cutting edge is moved along the grooving direction. When grooving the end face by
An insert longitudinal axis passing through the center of the insert body in the width direction and extending along the extending direction is defined with respect to a virtual tool plane including at least one of the pair of corner portions of the one cutting edge and the rotation axis. Of the pair of cutting edges, and gradually approaching the tool imaginary plane as it goes to the one extending direction, which is the direction from the other cutting edge of the pair of cutting edges to the one cutting edge. An end face grooving method characterized in that the end face grooving method is provided.   An end face grooving method according to claim 9,
  An end face grooving method characterized in that an angle θ3 formed by the insert longitudinal axis and the tool virtual plane is set to 0 ° <θ3 ≦ 10 ° when the cutting insert is viewed from the side of the insert body. .   An end face grooving method according to claim 9 or 10,
  The end surface is an end surface facing the base end side of the tool body in a step portion formed on the outer peripheral surface of the work material;
  An end face grooving method characterized in that an outer diameter side end face grooving process is performed on the end face by the one cutting edge.   It is an end face grooving method according to any one of claims 9 to 11,
  Among the width directions, the direction from one corner portion to the other corner portion in the pair of corner portions as the other width direction,
  Among the work materials, the one corner portion of the other cutting edge is set to the one side with respect to a peripheral surface that rises in the direction of the rotation axis adjacent to the end surface and is formed around the rotation axis. Arranged at a distance from the one corner portion cut into the end surface along the peripheral surface of the cutting edge,
  The one corner portion of the other cutting edge located on the side opposite to the other width direction is arranged farther from the rotation axis than the one corner portion of the one cutting edge. End face grooving method.   An end face grooving method according to any one of claims 9 to 12,
  An end face groove characterized in that the insert longitudinal axis is extended so as to gradually approach the tool virtual plane from the other cutting edge located above the tool virtual plane toward the one extending direction. Putting method.   An end face grooving method according to any one of claims 9 to 12,
  The end face characterized in that the insert longitudinal axis extends so as to gradually approach the tool virtual plane from the other cutting edge located on the lower side of the tool virtual plane toward the one extending direction. Grooving method.   An end face grooving method according to any one of claims 9 to 14,
  The corner portion includes a convex-curved first corner blade, and a linear second corner blade that connects the end portion of the first corner blade in the extending direction of the insert main body and the side cutting blade. Have
  End face grooving characterized in that the second corner blade is extended and arranged so as to be parallel to the rotation axis of the work material when the cutting insert is viewed from a direction orthogonal to the tool virtual plane. Processing method.

Images