JP5526804B2 - Exchangeable grooving tool and peripheral grooving method - Google Patents

Description

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

  Conventionally, a work piece made of a metal material or the like is rotated around a rotation axis, and a groove is formed by a cutting insert cutting edge on the outer peripheral surface of the work material or an inner peripheral surface of a machining hole formed around the rotation axis. 2. Description of the Related Art There is known a blade edge exchange type grooving tool for performing a machining process. For example, in a conventional cutting edge-replaceable grooving tool 100 shown in FIG. 13, a cutting insert 30 formed in the shape of a bar having a rectangular cross section is detachably attached to the tip of a shaft-shaped tool body 1. The cutting insert 30 has a pair of cutting edges 32 at both ends in the extending direction (vertical direction in FIG. 13) of the rod-shaped insert main body 31. Of these cutting edges 32, one cutting edge 32 </ b> A protruding from the tip surface of the tool body 1 is perpendicular to the rotation axis WO so as to be along the stepped portion U of the work material W formed in a multistage cylindrical shape. By moving in the Y direction, the outer peripheral surface R of the work material W is subjected to grooving (outer diameter grooving). In the example of FIG. 13, the stepped portion U of the work material W is formed with an end face E adjacent to the small diameter portion of the outer peripheral surface R of the work material W and orthogonal to the rotation axis WO. The blade 32A is grooved into the small diameter portion by moving along the end face E. 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. 13, 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.

  Further, in the example of FIG. 14, the above-described cutting insert 30 is detachably attached to the distal end portion of the blade-type replaceable grooving tool 105 having an axial shape. In this example, the cutting insert 30 extends in the vertical direction (Y direction) in FIG. 14, and one cutting edge 32 </ b> A protrudes from the outer peripheral surface of the tip portion of the tool body 1. Then, this one cutting edge 32A performs grooving processing (inner diameter grooving) on the inner peripheral surface S of the processing hole H of the work material W. A back surface (end surface) B that is adjacent to the inner peripheral surface S and orthogonal to the rotation axis WO is formed in the processing hole H of the work material W, and one of the cutting edges 32A extends along the end surface B. The inner circumferential surface S is grooved by moving in the Y direction perpendicular to the rotation axis WO.

In this manner, circumferential grooving such as outer grooving and inner grooving using the blade-replaceable grooving tools 100 and 105 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-mentioned blade edge replaceable grooving tools 100 and 105 have the following problems.
The cutting insert 30 is arranged such that the extending direction of the insert main body 31 (the insert longitudinal axis C1 shown in FIGS. 13 and 14) extends in parallel to the end faces E and B of the work material W. The cutting edges 32 have the same distance from the end faces E and B. There is no particular problem when one cutting edge 32A is separated from the end faces E and B of the work material W and grooved into the peripheral surface in such an arrangement state of the cutting insert 30; When grooving the peripheral surface while moving along the end faces E and B of the work material W, the other cutting edge 32B comes into contact with the end faces E and B and is damaged. In the outer diameter grooving of FIG. 13, the relationship between the diameter φd1 of the large diameter portion where the end face E is formed in the work material W and the distance L3 from the other cutting edge 32B to the rotation axis WO is d1 / 2. <L3, there is no contact, but since contact is made when d1 / 2 ≧ L3, the shape of the work material W is limited, and the distance L3 is reduced during processing, and the contact described above. May occur. 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. 15, the corner portion 43 </ b> C located on the end surface E, B side of the workpiece W at the other cutting edge 32 </ b> B contacts the end surfaces E, B. For this reason, the peripheral surface grooving along the end surfaces E and B of the work material W as shown in FIGS. 13 and 14 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. As a result, when the cutting insert is mounted on the tool body, the corner portion on the end surface E (B) side of the other cutting edge is more end-faced than the corner portion on the end surface E (B) side of the one cutting edge. B). 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 the peripheral surface grooving is performed along the end surface of the work material without increasing the number of parts of the cutting insert, the processing accuracy is increased. It is an object of the present invention to provide a blade replacement type grooving tool and a peripheral surface 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 in which a cutting edge protrudes toward the peripheral surface of a work material that rotates about a rotation axis, and a tool that has an axial shape and is detachably attached to a tip portion. A cutting edge replacement type grooving tool that grooving the peripheral surface with the cutting blade, wherein the cutting insert is at both ends in the extending direction of the rod-shaped insert body. A pair of cutting edges on the upper surface of the insert body, and a rotational symmetry 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 an insert imaginary plane that is perpendicular to the extending direction and includes the insert height axis, and the cutting edge is formed at the 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 is cut into the pair of cuts, with a direction from one corner portion to the other corner portion in the pair of corner portions as the other width direction. One corner portion located on the side opposite to the other width direction in the other cutting edge of the blade is more than the one corner portion in the one cutting edge. Square are arranged in the width direction of the cutting insert to the tool body are arranged along the one side surface facing the side of the tool body, said grooving direction, of the tool body The one corner portion located in a direction toward the distal end side and separated from the central axis of the tool body than the other corner portion of the other cutting edge is the other corner portion of the one cutting edge. The one corner portion located in a direction away from the central axis than the corner is arranged in a direction approaching the central axis .
The present invention also provides a cutting insert having a cutting edge projecting toward the peripheral surface of a work material that rotates about a rotation axis, and a tool that has a shaft shape and is detachably attached to the tip portion. A cutting edge replacement type grooving tool that grooving the peripheral surface with the cutting blade, wherein the cutting insert is at both ends in the extending direction of the rod-shaped insert body. A pair of cutting edges on the upper surface of the insert body, and a rotational symmetry 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 an insert imaginary plane that includes the insert height axis and is perpendicular to the extending direction, and the cutting edge is formed at the edge of the insert body in the extending direction and has the width. A front cutting edge extending along the direction, a pair of corner portions disposed at both ends of the front cutting edge and projecting in the width direction, and a center side of the insert body along the extending direction from the corner portion A pair of side surface cutting edges each extending so as to gradually narrow each other as it goes to the tool body, 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 is the pair of cutting edges, with the width direction being the direction from one corner portion to the other corner portion of the pair of corner portions. One corner portion of the other cutting edge located on the opposite side of the other width direction is more than the other corner portion of the one cutting edge. It is arranged on the width direction side, the cutting insert is arranged on the tool body so as to be along the tip side surface facing the tip side of the tool body, and the grooving direction is the central axis of the tool body The one corner portion located on the tip side of the tool body with respect to the other corner portion of the other cutting edge is more than the other corner portion of the one cutting edge. It is characterized by being arranged on the base end side of the tool main body with respect to the one corner portion located on the front end side of the tool main body.
The present invention also provides a cutting insert having a cutting edge projecting toward the peripheral surface of a work material that rotates about a rotation axis, and a tool that has a shaft shape and is detachably attached to the tip portion. A peripheral grooving method for grooving the peripheral surface of the work material with the cutting edge using a blade-exchangeable grooving tool having a main body, wherein the cutting insert is a rod-shaped insert A pair of cutting edges are provided on the upper surface of the insert main body at both ends in the extending direction of the main body, 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, and It is formed rotationally symmetric with respect to the insert height axis perpendicular to the width direction and symmetric with respect to the 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 projecting the cutting edge in the grooving direction and mounting it on the tool body, and grooving the peripheral surface by moving the one cutting edge along the grooving direction, Of the width direction, the direction from one corner portion to the other corner portion of the pair of corner portions is defined as the other width direction, and the front of the other cutting edge of the pair of cutting edges. One of the corner portions and the other in the width direction positioned on the opposite side, the than the one of the corner portions at one cutting edge arranged in the width direction of the other, the peripheral surface of the workpiece, the An outer peripheral surface that faces the outer side in the radial direction orthogonal to the rotation axis, and of this work material, an end surface that rises toward the outer side in the radial direction adjacent to the outer peripheral surface and is perpendicular to the rotation axis On the other hand, the one corner portion of the other cutting edge is disposed away from the one corner portion cut into the outer peripheral surface along the end surface of the one cutting edge. .
The present invention also provides a cutting insert having a cutting edge projecting toward the peripheral surface of a work material that rotates about a rotation axis, and a tool that has a shaft shape and is detachably attached to the tip portion. A peripheral grooving method for grooving the peripheral surface of the work material with the cutting edge using a blade-exchangeable grooving tool having a main body, wherein the cutting insert is a rod-shaped insert A pair of cutting edges are provided on the upper surface of the insert main body at both ends in the extending direction of the main body, 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, and It is formed rotationally symmetric with respect to the insert height axis perpendicular to the width direction and symmetric with respect to the 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 projecting the cutting edge in the grooving direction and mounting it on the tool body, and grooving the peripheral surface by moving the one cutting edge along the grooving direction, Of the width direction, the direction from one corner portion to the other corner portion of the pair of corner portions is defined as the other width direction, and the front of the other cutting edge of the pair of cutting edges. One corner portion located on the opposite side to the other width direction is disposed on the other width direction side of the one cutting edge of the one cutting edge, and the peripheral surface of the work material is It is an inner peripheral surface facing the inner side in the radial direction orthogonal to the rotation axis, and is formed perpendicularly to the rotation axis while rising toward the inner side in the radial direction adjacent to the inner peripheral surface of the work material. The one corner portion of the other cutting edge is arranged away from the one corner portion cut into the inner peripheral surface along the end face of the one cutting edge with respect to the end face. Features.

  According to the cutting edge replaceable grooving tool and the peripheral surface grooving method according to the present invention, the cutting insert has one corner portion located on the opposite side to the other width direction in the other cutting edge, It arrange | positions in the said other width direction side with respect to one corner part located in the said opposite side in a cutting blade. Thereby, for example, when performing grooving (outer diameter grooving) on the outer peripheral surface of the work material along the end surface orthogonal to the rotation axis in the step portion of the work material having a multistage cylindrical shape, There are the following effects. That is, for example, one corner portion of one cutting edge of the cutting insert is disposed close to the end surface of the work material, and this cutting insert is moved along the end surface in the grooving direction to perform grooving. When this is done, it is reliably prevented that one corner portion of the other cutting edge is separated from the end surface and the corner portion contacts the end surface and is damaged. Further, the contact prevents the other unused cutting edge from being damaged. In this case, regardless of the diameter d1 of the large-diameter portion of the work material W described in FIG. 13, one corner portion of the other cutting edge is separated from this end surface, and this corner portion contacts the end surface. Can be surely prevented from being damaged. Also, when grooving (inner diameter grooving) to the inner peripheral surface of the processing hole along the inner surface (end surface) of the cylindrical hole-shaped processing hole formed around the rotation axis of the work material, The same effects as described above are achieved.

  In addition, since the pair of side surface cutting blades provided in each cutting edge are formed to be inclined so as to gradually narrow each other from the outside in the extending direction of the insert body toward the center side, the processing of the groove wall Accuracy is ensured. In other words, even if the mounting posture of the cutting insert with respect to the tool body is set as described above, the side cut disposed on the side opposite to the end face side of the work material (that is, the other width direction side) on one cutting edge. The blade does not come into contact with the opening edge of the groove wall on the opposite side of the groove formed in the work material.

Further, in the cutting edge-replaceable grooving tool according to the present invention, the cutting insert is oriented in a direction orthogonal to a tool virtual plane including at least one of the pair of corner portions of the one cutting edge and the rotation axis. , The angle θ1 formed by the insert width axis along the width direction passing through the center in the extending direction of the insert body and the rotation axis may be set to 0 ° <θ1 ≦ 5 °.
Further, in the circumferential grooving method according to the present invention, the cutting insert is oriented in a direction orthogonal to a virtual tool plane including at least one of the pair of corner portions of the one cutting edge and the rotation axis. The angle θ1 formed by the insert width axis along the width direction passing through the center in the extending direction of the insert body and the rotation axis may be set to 0 ° <θ1 ≦ 5 °.

According to the cutting edge replaceable grooving tool and the peripheral surface grooving method according to the present invention, for example, when the end surface of the work material is formed perpendicular to the rotation axis, the extending direction of the insert body is covered. The angle inclined with respect to the end face of the cutting material is a value approximate to the angle θ1 formed by the insert width axis and the rotation axis. That is, the cutting insert is mounted on the tool main body so that the extending direction of the insert main body is slightly parallel to the end surface of the work material while being substantially parallel. Therefore, as described above, one corner of the other cutting edge is reliably separated from the end face to ensure the processing accuracy of the end face, while ensuring the processing accuracy of the groove bottom of the groove formed in the work material. it can. Specifically, by setting the angle θ1 within the above-described range, the groove bottom of the grooved work material is formed substantially parallel to the rotation axis, so that the machining accuracy of the groove bottom is increased. Yes.

  Further, in the cutting edge-replaceable grooving tool according to the present invention, the peripheral surface is an outer peripheral surface facing away from the rotation axis of the work material, and the one cutting edge is in relation to the outer peripheral surface. It is good also as carrying out an outer diameter grooving process.

  According to the cutting edge exchange type grooving tool according to the present invention, for example, in the step portion of the work material having a multi-stage columnar shape, an end surface that is formed of an annular surface adjacent to the small diameter portion of the outer peripheral surface and orthogonal to the rotation axis is formed. Even if it is the case, it is possible to perform grooving with high accuracy regardless of the position of the outer peripheral surface to be grooved.

  Further, in the edge-changing grooving tool according to the present invention, the peripheral surface is an inner peripheral surface facing the rotation axis side of the work material, and the one cutting edge has an inner diameter with respect to the inner peripheral surface. Grooving may be performed.

  According to the cutting edge replaceable grooving tool according to the present invention, for example, a back surface (end surface) perpendicular to the rotation axis is formed adjacent to the inner peripheral surface of a cylindrical hole-shaped processing hole formed in a work material. Even in the case where the groove is formed, it is possible to perform grooving with high accuracy regardless of the position of the inner peripheral surface to be grooved.

  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 insert has two corner blades, and the cutting insert is viewed from a direction orthogonal to a virtual virtual plane including at least one of the pair of corner portions of the one cutting blade and the rotation axis. The corner blade may extend so as to be orthogonal to the rotation axis of the work material.
Further, in the peripheral grooving method according to the present invention, the corner portion includes a convex-curved first corner blade, a center-side end portion of the insert body in the first corner blade, and the end portion A second virtual cutting edge that connects the side cutting edge, and the cutting insert includes at least one of the pair of corners of the one cutting edge and the virtual axis of rotation including the rotation axis. The second corner blade may be extended and arranged so as to be orthogonal to the rotation axis of the work material when viewed from a direction orthogonal to the workpiece.

According to the cutting edge-replaceable grooving tool and the circumferential grooving method according to the present invention, the corner portion of the cutting edge includes a central end portion along the extending direction of the insert body in the first corner blade and a side cut. Since the second corner blade connecting the blade extends so as to be orthogonal to the rotation axis of the work material, the groove wall of the work material cut by the front face cutting edge of the one cutting edge and the first corner blade 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 circumferential grooving method according to the present invention, the circumferential grooving is performed along the end surface of the work material without increasing the number of parts of the cutting insert. Can also ensure sufficient machining accuracy.

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 and work material which concern 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 schematic perspective view which shows the cutting edge exchange-type grooving tool which concerns on the 2nd Embodiment of this invention, and the workpiece which performs grooving using this cutting-edge exchange-type grooving tool. It is the top view which looked at the cutting-blade exchange type grooving tool and work material which concern on the 2nd 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 the front view which looked at the blade-tip-exchange-type grooving tool and work material which concern on the 2nd Embodiment of this invention from the front end side of the tool main body, and is the figure which looked at the cutting insert from the side surface. It is a figure which expands and shows the cutting insert 30 vicinity in FIG. 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 (outer diameter grooving) and a 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 the top view which looked at the conventional blade-tip-exchange-type grooving tool (inner diameter grooving) and a 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. 13, FIG.

(First embodiment)
FIGS. 1-6 has shown the cutting insert 30 used for the blade-tip-exchange-type grooving tool 10 which concerns on the 1st Embodiment of this invention, and this blade-tip-exchange-type grooving tool 10. FIG. The cutting edge-replaceable grooving tool 10 according to the present embodiment is detachably attached to a tool body 1 that is formed in an axial shape and has a substantially rectangular cross section, and an end portion (tip portion) 3 on the tip side of the tool 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 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 about the rotation axis WO in a state where the extending direction (Y direction shown in the figure) of the tool body 1 is arranged substantially perpendicular to the rotation axis WO of the work material W. The tip 3 of the tool body 1 is directed to the step U on the outer peripheral surface R of the work material W rotating in the direction WT, the cutting edge 32 is moved along the end surface E of the step U, and the small diameter portion The outer peripheral surface R is 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 a machine tool (not shown) by being held in a state where the shank portion 2 is prevented from rotating. In the following description, in the Y 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 one of the directions along the rotation axis WO (X direction in FIG. 2) on the distal end surface 1A. It is formed at the end of the 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 3 </ b> B at the distal end portion 3 of the tool body 1 is flush with the lower surface of the shank portion 2.

  Further, the tool body 1 has a side surface 3C facing the one side out of both side surfaces facing the side (X direction in FIG. 2) at the tip portion 3, and is flush with the side surface facing the one side in the shank portion 2. And the side surfaces of the upper jaw portion 6 and the lower jaw portion 7 facing the one side are formed. Further, the distal end portion 3 is formed with another side surface 3D which is disposed to face the other side (the right side in FIG. 2) of the both side surfaces and to face the one side surface 3C. The other side surface 3D of the distal end portion 3 is flush with the side surface of the shank portion 2 facing the other side of the shank portion 2, and gradually moves toward the one side from the central portion toward the distal end portion toward the distal end side. It is formed in a tapered shape so as to be inclined. 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.

  In the side view of FIG. 3, the upper jaw portion 6 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 3 </ b> B 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, and is located on the side surface 3C side of the tip 3 and extends in the Y 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 X direction. Moreover, the front-end | tip part of the insert mounting seat 4 is opened also in the direction (groove insertion direction YA mentioned later) which faces the front end side among Y 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 lower surface 3B to the upper surface 3A 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 lower surface 3B toward the upper surface 3A 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. Further, the cutting insert 30 includes an insert longitudinal axis C1 and an insert height axis C3, and each center of an upper surface (a surface facing upward in FIG. 4) and a lower surface (a surface facing downward in FIG. 4) of the insert body 31. The insert virtual plane VS2 is also formed symmetrically (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. 4 and 5, the cutting insert 30 has a concave V-shape in which the central portion in the extending direction on the upper surface of the insert body 31 and the lower surface are cross sections 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 32A is disposed on the one side (lower side in FIG. 2) of the pair of cutting edges 32, A cutting edge 32B is disposed on the other side (the upper side 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 to face the outer peripheral surface R of the work material W, and is grooved in the outer peripheral surface R. It is designed to be processed. 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 YA in the Y direction, A cutting insert 30 is attached.

  2 and 4 to 6, 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 the direction from one corner 43A (43C) located on the end face E side of W to the other corner 43B (43D) located on the opposite side to the end face E side, is shown. As shown in the front view of FIG. 4, the insert width axis C <b> 2 of the cutting insert 30 is parallel to the rotation axis WO of the workpiece W. Further, the front cutting edge 41 of one cutting edge 32A is parallel to the insert width axis C2, and is located on the rotation axis WO in this front view. Thereby, corner part 43A and corner part 43B located in the both ends of front cutting edge 41 in one cutting edge 32A are arranged in the same position along rotation direction WT mutually.

  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, as 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 end face E toward the other width direction C2A, the front side in the gradually rotating direction WT. Alternatively, it may be inclined toward the rear side and inclined with respect to the rotation axis WO. In the present embodiment, the tool virtual plane VS3 is arranged in the XY horizontal plane.

  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. As shown in the side view of FIG. 3, the insert longitudinal axis C1 of the cutting insert 30 is inclined so as to gradually approach the tool virtual plane VS3 toward the one extending direction C1A.

  Specifically, as shown in FIG. 3, when viewed from the side surface 3 </ b> C side of the tool body 1, the insert longitudinal axis C <b> 1 gradually moves toward the lower surface side of the insert body 31 (left and right in FIG. 3) toward the one extending direction C <b> 1 </ b> A. It extends so as to approach the tool virtual plane VS3 from the direction (left side in the Z direction) toward the upper surface side (right side in FIG. 3). Thereby, the front cutting edge 41 of the cutting edge 32B is separated toward the lower surface side (left side in FIG. 3) of the insert main body 31 with respect to the tool virtual plane VS3. 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 tool virtual plane VS3 is set in a range of 0 ° <θ3 ≦ 10 °. In the present embodiment, this θ3 is set to about 3 °, for example.

  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. It inclines and arrange | positions so that it may go to 3 A of upper surfaces. Note that the insert longitudinal axis C1 of the cutting insert 30 may gradually extend from the upper surface side to the lower surface side of the insert body 31 so as to approach the tool virtual plane VS3 toward the one extending direction C1A. . That is, the insert longitudinal axis C1 is gradually inclined toward the lower surface 3B of the tool main body 1 as it goes in the one extending direction C1A, and the cutting edge 32B of the insert main body 31 with respect to the tool virtual plane VS3. You may be spaced apart toward the upper surface side. Further, the cutting edge 32B may be disposed in the tool virtual plane VS3, and the insert longitudinal axis C1 may be included in the tool virtual plane VS3.

  FIG. 2 is a top view of the cutting insert 30 as viewed from a direction orthogonal to the tool virtual plane VS3. The cutting insert 30 has an angle θ1 between the insert width axis C2 and the rotation axis WO of 0 ° < It is set within the range of θ1 ≦ 5 ° and is mounted on the insert mounting seat 4. The angle θ1 is more preferably set within a range of 0.5 ° ≦ θ1 ≦ 3 °. In the present embodiment, the θ1 is set to about 1 °.

  As shown in FIGS. 2 and 6, when viewed from the direction orthogonal to the tool virtual plane VS3 and facing the rake face 33, the cutting insert 30 is connected to the other width direction C2A of the other cutting edge 32B. The corner portion 43C located on the opposite side is disposed on the other width direction C2A side of the corner portion 43A located on the opposite side of the one cutting edge 32A. That is, the corner portion 43A located on the one side surface 3C side (left side in FIGS. 2 and 6) of the tool body 1 in the one cutting edge 32A is more than the corner portion 43C located on the one side surface 3C side in the other cutting edge 32B. Is also arranged on the side surface 3C side. In the present embodiment, the corner portion 43C located on the end surface E side in the cutting edge 32B is separated from the end surface E with respect to the corner portion 43A located on the end surface E side in the cutting edge 32A.

  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 end surface E of the work material W. The cutting edge 32 </ b> A is grooved with respect to the outer peripheral surface R by moving in the grooving direction YA toward the radially inner side of the work material W along the end surface E.

  As described above, according to the cutting edge-replaceable grooving tool 10 and the peripheral surface grooving method using the same according to the present embodiment, the cutting insert 30 has the other width direction C2A in the other cutting edge 32B. One corner portion 43C located on the opposite side to the one is disposed on the other width direction C2A side with respect to one corner portion 43A located on the opposite side in one cutting edge 32A. Accordingly, as in the present embodiment, in the stepped portion U of the work material W having a multi-stage columnar shape, grooving processing is performed on the outer peripheral surface R of the work material W along the end surface E perpendicular to the rotation axis WO ( When performing outer grooving), the following operational effects are obtained.

  That is, one corner portion 43A of one cutting edge 32A of the cutting insert 30 is disposed close to the end surface E of the work material W, and the cutting insert 30 is placed along the end surface E in the grooving direction YA. When the grooving process is performed by moving to one end, it is ensured that one corner portion 43C of the other cutting edge 32B is separated from the end surface E, and the corner portion 43C contacts the end surface E and is damaged. To be prevented. Further, the contact prevents the other unused cutting edge 32B from being damaged. In this case, regardless of the diameter d1 of the large-diameter portion of the work material W shown in FIG. 2, one corner portion 43C of the other cutting edge 32B is separated from the end surface E, and the corner portion 43C is the end surface. It is reliably prevented that the E is touched and damaged.

  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 processing accuracy of the groove wall in the processed groove is ensured. That is, even if the mounting posture of the cutting insert 30 with respect to the tool body 1 is set as described above, the one cutting edge 32A is opposite to the end surface E side of the workpiece W (that is, the other width direction C2A side). Therefore, the side cutting edge 42 disposed on the workpiece W does not come into contact with the opening edge of the groove wall on the opposite side of the groove formed in the work material W.

  Further, when the cutting insert 30 is viewed from a direction orthogonal to the tool virtual plane VS3, an angle θ1 formed by the insert width axis C2 along the width direction of the insert main body 31 and the rotation axis WO of the work material W is 0 ° <θ1. It is set within a range of ≦ 5 °. Accordingly, the angle at which the insert longitudinal axis C1 along the extending direction of the insert body 31 is inclined with respect to the end surface E of the work material W is a value that approximates the angle θ1. That is, the cutting insert 30 is mounted on the tool body 1 with the extending direction of the insert body 31 (insert longitudinal axis C <b> 1) being slightly parallel to the end surface E of the work material W while being slightly parallel. Accordingly, as described above, the corner portion 43C of the other cutting edge 32B is reliably separated from the end surface E to ensure the processing accuracy of the end surface E, while the groove bottom D of the groove formed in the work material W is secured. Processing accuracy can be secured. Specifically, by setting the angle θ1 within the above-described range, the groove bottom D of the grooved work material W is formed substantially parallel to the rotation axis WO. Has been increased.

  In addition, when the angle θ1 is set to 0.5 ° ≦ θ1 ≦ 3 °, the above-described effects can be obtained more reliably. That is, the corner portion 43C of the cutting edge 32B is more reliably separated from the end face E by setting the angle θ1 to 0.5 ° or more. Further, by setting the angle θ1 to 3 ° or less, the groove bottom D is formed more parallel to the rotation axis WO, and the processing accuracy is improved.

  Specifically, when the angle θ1 is set to 0.5 ° or more, the position of the cutting edge 32B with respect to the tool virtual plane VS3 (lower side, upper side, or within the tool virtual plane VS3), or a front view of the cutting insert 30 in FIG. In this case, regardless of the angle at which the front cutting edge 41 of the cutting edge 32A is inclined with respect to the rotation axis WO, the corner portion 43C of the cutting edge 32B is on the other width direction C2A side with respect to the corner portion 43A of the cutting edge 32A. As well as being positioned, it is reliably spaced from the end face E.

  Further, the cutting insert 30 of the present embodiment is inclined so as to gradually approach the tool virtual plane VS3 as the insert longitudinal axis C1 moves toward the one extending direction C1A, and toward the upper surface side of the insert body 31. It extends. That is, the cutting edge 32 </ b> B is separated from the tool virtual plane VS <b> 3 toward the lower surface side of the insert body 31. Thereby, one cutting edge 32A will cut sharply with respect to the outer peripheral surface R of the workpiece W, and it can fully improve a sharpness.

  In this way, in the outer diameter grooving using the above-described blade edge replaceable grooving tool 10, the annular ring adjacent to the small diameter portion of the outer peripheral surface R in the stepped portion U of the work material W having a multistage cylindrical shape. Even if the end face E which is formed of a surface and is orthogonal to the rotation axis WO is formed, the outer diameter grooving with high accuracy can be performed regardless of the position of the outer peripheral surface R to be grooved.

  In the present embodiment, it has been described that the insert width axis C2 and the front cutting edge 41 of the cutting edge 32A extend in parallel to the rotation axis WO in the front view of FIG. When formed so as to be gradually inclined toward the front side or the rear side in the rotational direction WT as it is separated from the end surface E toward the other width direction C2A, the groove bottom D of the groove formed in the work material W is formed. There is an effect that it can be formed more parallel to the rotation axis WO. That is, the corner portion 43B that protrudes in the grooving direction YA from the corner portion 43A in the cutting edge 32A is separated downward or upward from the tool virtual plane VS3 and separated from the rotation axis WO. The inclination angle of the groove bottom D with respect to the rotation axis WO is suppressed.

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

  The cutting edge-replaceable grooving tool 20 of the present embodiment includes a tool body 1 that is formed in an axial shape and has a substantially circular cross section perpendicular to the center axis TO, and a tip 3 that extends along the center axis TO of the tool body 1. It has a cutting insert 30 that is detachably mounted and projects a cutting edge 32A from the outer peripheral surface 1B of the tool body 1 toward the side. That is, as shown in FIG. 8, when viewed from the direction orthogonal to the tool virtual plane VS <b> 3, the cutting edge replaceable grooving tool 20 of the present embodiment uses the insert longitudinal axis C <b> 1 of the cutting insert 30 as the center axis TO of the tool body 1. The cutting insert 30 is disposed along the tip surface of the tip portion 3 of the tool body 1. In FIG. 8, the tool body 1 is disposed along the X direction so as to extend substantially parallel to the rotation axis WO of the work material W, and one cutting edge 32A is directed in the grooving direction YA. Protruding.

  This blade edge exchange type grooving tool 20 performs an inner diameter grooving process on a substantially cylindrical work material W. In the work hole H having a cylindrical hole shape in the work material W, an inner face (end face) B formed of a circular plane orthogonal to the rotation axis WO of the work material W is formed in the innermost part. . The back surface B is adjacent to the inner peripheral surface (circumferential surface) S of the processing hole H. The blade-tip-exchange-type grooving tool 20 inserts the tip 3 of the tool body 1 into a machining hole H formed around the rotational axis WO in the work material W that rotates in the rotational direction WT about the rotational axis WO. Then, in a state where the corner portion 43A of one of the cutting edges 32A is disposed so as to be in contact with the back surface B of the work material W, the groove toward the radially outer side of the work material W along the back surface B By moving in the insertion direction YA, the cutting edge 32A is grooved with respect to the inner peripheral surface S facing the rotation axis WO side of the processing hole H. In the present embodiment, the rotation direction WT of the work material W is set opposite to that in the first embodiment.

  In the cutting edge exchange-type grooving tool 20 of the present embodiment, as shown in a side view of the cutting insert 30 in FIG. 9 (a front view in the tool body 1), the insert longitudinal axis C1 of the cutting insert 30 is the one of the ones. Gradually approaching the tool virtual plane VS3 from the upper surface side (the upper side in the vertical direction (Z direction) in FIG. 9) to the lower surface side (the lower side in the Z direction in FIG. 9) as it goes in the extending direction C1A. It extends to do. 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 (upward in the vertical direction (Z direction) in FIG. 9). The insert longitudinal axis C1 of the cutting insert 30 is gradually inclined toward the upper surface side of the insert main body 31 as it goes in the one extending direction C1A, and the cutting edge 32B is inserted into the insert virtual body VS3. It may be arranged on the lower surface side of 31. Alternatively, the insert longitudinal axis C1 may be parallel to the tool virtual plane VS3 and disposed in the tool virtual plane VS3.

  Although not shown, when the cutting insert 30 is viewed from the front (that is, the front flank 51 side), the insert width axis C2 of the cutting insert 30 and the front cutting edge 41 of the one cutting edge 32A are the rotation axis of the workpiece W. Parallel to WO. In this front view, the front cutting edge 41 of the cutting edge 32A gradually moves toward the front side or the rear side in the rotational direction WT as it approaches the back surface B toward the side opposite to the other width direction C2A. It may be inclined and may be formed inclined with respect to the rotation axis WO.

  As shown in FIGS. 8 and 10, when viewed from the direction orthogonal to the tool virtual plane VS3 and facing the rake face 33, the cutting insert 30 is connected to the other width direction C2A of the other cutting edge 32B. The corner portion 43C located on the opposite side is disposed on the other width direction C2A side of the corner portion 43A located on the opposite side of the one cutting edge 32A. That is, the corner portion 43A located on the distal end side (left side in FIG. 10) of the tool body 1 in one cutting edge 32A is closer to the distal end side than the corner portion 43C located on the distal end side in the other cutting edge 32B. Has been placed. In the present embodiment, the corner portion 43C located on the back surface B side in the cutting edge 32B is separated from the back surface B with respect to the corner portion 43A located on the back surface B side in the cutting edge 32A.

  According to the cutting edge-replaceable grooving tool 20 according to the present embodiment, in the cylindrical hole-shaped machining hole H formed in the workpiece W, the workpiece W along the back surface B orthogonal to the rotation axis WO. Even in the case of grooving (inner diameter grooving) on the inner peripheral surface S of the inner peripheral surface S, the corner portion 43C of the cutting edge 32B is separated from the inner surface B regardless of the position of the inner peripheral surface S to be grooved, The corner portion 43C is reliably prevented from coming into contact with the back surface B and being damaged, and a highly accurate inner diameter grooving can be performed. Further, the contact prevents the other unused cutting edge 32B from being damaged.

  Further, the insert longitudinal axis C1 of the cutting insert 30 is inclined so as to gradually approach the tool virtual plane VS3 toward the one extending direction C1A and extends toward the lower surface side of the insert body 31. That is, since the other cutting edge 32B is separated toward the upper surface side of the insert body 31 with respect to the tool virtual plane VS3, the wedge angle β of the one cutting edge 32A (the rake face 33 and the front clearance in FIG. 9). The angle formed with the surface 51 can be set relatively large. Therefore, the cutting edge strength of one of the cutting edges 32A for grooving the work material W is sufficiently ensured.

  Further, according to such a mounting posture of the cutting insert 30, the thickness of the lower jaw portion 7 that supports the lower surface of the cutting insert 30 can be sufficiently secured at the distal end portion 3 of the tool body 1. Strength is increased. Further, it is possible to prevent the front flank 51 connected to the front cutting edge 41 of the cutting edge 32A from being separated from the groove bottom D and coming into contact with the groove bottom D.

  In the present embodiment, it has been described that the front cutting edge 41 of the insert width axis C2 and the cutting edge 32A extends parallel to the rotation axis WO in the front view of the cutting insert 30. In the case where it is formed to be inclined toward the front side or the rear side of the rotational direction WT gradually toward the back surface B toward the opposite side to the other width direction C2A, it is formed on the work material W. There is an effect that the groove bottom D of the groove to be formed can be formed more parallel to the rotation axis WO. In other words, the corner portion 43A that is recessed in the cutting edge 32A on the opposite side to the grooving direction YA with respect to the corner portion 43B is separated downward or upward from the tool virtual plane VS3 and is separated from the rotation axis WO. As a result, the inclination angle of the groove bottom D with respect to the rotation axis WO is suppressed.

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. 11 and 12 show a modified example of the corner portion 43. In FIG. 11, 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. 12, the corner portion 43 includes a first corner blade 44, an end portion on the center side (upper side in FIG. 12) 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. When the cutting insert 30 is viewed from the direction orthogonal to the tool virtual plane VS3, the second corner blade 45 extends so as to be orthogonal to the rotation axis WO of the work material W, and extends to the end surface E or the back surface B. It is formed so as to extend in parallel. 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 peripheral surfaces R and S along the end surfaces E and B of the work material W. However, the present invention is not limited to this. is not. For example, the peripheral surfaces R and S separated from the end surfaces E and B of the work material W may be grooved. According to the embodiment of the present invention, even when any of the peripheral surfaces R and S adjacent to the end surfaces E and B of the work material W or the separated peripheral surfaces R and S is grooved, high precision is achieved. Can be cut.

1 Tool body 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 B Back face (end face)
C1 insert longitudinal axis (extending direction of the insert body)
C2 Insert width axis (width direction of the insert body)
C2A Of the width direction of the insert body, the other width direction is the direction from one corner portion toward the other corner portion. C3 Insert height axis (height direction of the insert body)
E End face R Workpiece outer peripheral surface (peripheral surface)
S Inner peripheral surface (peripheral surface)
TO Center axis of tool body VS1 Insert virtual plane VS3 Tool virtual plane W Work material WO Rotation axis of work material YA Groove direction θ1 Angle between insert width axis and work material's rotation axis

Claims (11)

A cutting insert having a cutting edge protruding toward the peripheral surface of the work material rotating about the rotation axis, and a tool body having a shaft shape and having the cutting insert detachably attached to the tip. And a cutting edge exchange type grooving tool for grooving the peripheral surface 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,
Of the width directions, a direction from one corner portion to the other corner portion of the pair of corner portions is the other width direction, and the cutting insert is the other of the pair of cutting edges. One corner portion located on the opposite side to the width direction is disposed on the other width direction side than the one corner portion in the one cutting edge ,
The cutting insert is arranged on the tool body so as to be along one side surface facing the side of the tool body,
The grooving direction is a direction toward the tip side of the tool body,
The one corner portion located in a direction away from the central axis of the tool body from the other corner portion of the other cutting edge is closer to the central axis than the other corner portion of the one cutting edge. An edge-replaceable grooving tool, characterized in that it is arranged in a direction approaching the central axis with respect to the one corner portion located in the separating direction .   A cutting insert having a cutting edge protruding toward the peripheral surface of the work material rotating about the rotation axis, and a tool body having a shaft shape and having the cutting insert detachably attached to the tip. And a cutting edge exchange type grooving tool for grooving the peripheral surface 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,
  Of the width directions, a direction from one corner portion to the other corner portion of the pair of corner portions is the other width direction, and the cutting insert is the other of the pair of cutting edges. One corner portion located on the opposite side to the width direction is disposed on the other width direction side than the one corner portion in the one cutting edge,
  The cutting insert is arranged on the tool body so as to be along the tip side facing the tip side of the tool body,
  The grooving direction is a direction away from the center axis of the tool body,
  The one corner portion located closer to the tip side of the tool body than the other corner portion of the other cutting edge is located closer to the tip side of the tool body than the other corner portion of the one cutting edge. The blade edge exchange type grooving tool is arranged on the base end side of the tool main body with respect to the one corner portion. It is a blade exchange type grooving tool according to claim 1 or 2 ,
When the cutting insert is viewed from a direction orthogonal to a tool virtual plane including at least one of the pair of corner portions of the one cutting edge and the rotation axis, the center in the extending direction of the insert body is defined. An angle θ1 formed by the insert width axis along the width direction and the rotation axis is set to 0 ° <θ1 ≦ 5 °, wherein the blade edge exchange type grooving tool is characterized. It is a blade exchange type grooving tool according to claim 1 or 3 ,
The peripheral surface is an outer peripheral surface facing the opposite side of the rotation axis of the work material,
The one of the cutting edges is an outer diameter grooving process with respect to the outer peripheral surface. It is a blade exchange type grooving tool according to claim 2 or 3 ,
The peripheral surface is an inner peripheral surface facing the rotation axis side of the work material,
The one cutting edge is subjected to an inner diameter grooving process with respect to the inner peripheral surface. It is a blade-tip-exchange-type grooving tool according to any one of claims 1 to 5 ,
The corner portion has a convex-curved first corner blade, wherein the cutting edge exchange type grooving tool is provided. It is a blade exchange type grooving tool according to claim 6 ,
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 a virtual tool plane including at least one of the pair of corner portions of the one cutting edge and the rotation axis, the second corner blade is a work material. A cutting edge exchange-type grooving tool which extends so as to be orthogonal to the rotation axis of the blade. A cutting insert having a cutting edge projecting toward a peripheral surface of a work material rotating about a rotation axis; and a tool body having a shaft shape, the cutting insert being detachably mounted at a tip portion. A peripheral grooving method for grooving the peripheral surface of the work material with the cutting edge using a blade exchange type grooving tool,
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 peripheral surface by
Among the width directions, the direction from one corner portion to the other corner portion of the pair of corner portions is the other width direction, and the other width direction of the other cutting edge of the pair of cutting edges is the other width direction. One corner portion located on the opposite side is disposed on the other width direction side than the one corner portion in the one cutting edge ,
The peripheral surface of the work material is an outer peripheral surface facing outward in the radial direction perpendicular to the rotation axis,
Of the work material, the one corner portion of the other cutting edge is raised with respect to an end surface that rises toward the outside in the radial direction adjacent to the outer peripheral surface and is perpendicular to the rotation axis. The circumferential grooving method according to claim 1, wherein the circumferential grooving method is arranged apart from the one corner portion cut into the outer peripheral surface along the end surface of the one cutting edge .   A cutting insert having a cutting edge projecting toward a peripheral surface of a work material rotating about a rotation axis; and a tool body having a shaft shape, the cutting insert being detachably mounted at a tip portion. A peripheral grooving method for grooving the peripheral surface of the work material with the cutting edge using a blade exchange type grooving tool,
  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 peripheral surface by
  Among the width directions, the direction from one corner portion to the other corner portion of the pair of corner portions is the other width direction, and the other width direction of the other cutting edge of the pair of cutting edges is the other width direction. One corner portion located on the opposite side is disposed on the other width direction side than the one corner portion in the one cutting edge,
  The peripheral surface of the work material is an inner peripheral surface facing inward in the radial direction perpendicular to the rotation axis,
  Of the work material, the one corner portion of the other cutting edge with respect to an end surface that rises inward in the radial direction adjacent to the inner peripheral surface and is perpendicular to the rotation axis. Is disposed at a distance from the one corner portion cut into the inner circumferential surface along the end surface of the one cutting edge.   The peripheral surface grooving method according to claim 8 or 9,
  When the cutting insert is viewed from a direction orthogonal to a tool virtual plane including at least one of the pair of corner portions of the one cutting edge and the rotation axis, the center in the extending direction of the insert body is defined. A circumferential grooving method characterized in that an angle θ1 formed by the insert width axis along the width direction and the rotation axis is set to 0 ° <θ1 ≦ 5 °.   A circumferential surface grooving method according to any one of claims 8 to 10,
  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
  When the cutting insert is viewed from a direction perpendicular to a virtual virtual plane including at least one of the pair of corner portions of the one cutting edge and the rotation axis, the second corner blade is cut into the work material. The circumferential grooving method according to claim 1, wherein the circumferential grooving method is arranged so as to extend perpendicular to the rotation axis.

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