JP4802745B2 - Cutting insert and insert detachable cutting tool - Google Patents

Description

  The present invention is used, for example, for grooving or parting off of a workpiece, and is used by being detachably clamped to an insert mounting seat of a holder of an insert detachable cutting tool, and detachably attaching the cutting insert. The present invention relates to an insert detachable cutting tool.

  Conventionally, for example, for grooving or parting off of a workpiece, a substantially rod-shaped insert main body and a front end side and a rear end side in the longitudinal direction (axial direction) of the insert main body are provided, respectively. The cutting insert comprised from the cutting blade part provided with the cutting blade to perform is used (for example, refer patent document 1, patent document 2). This type of cutting insert is, for example, a groove-shaped insert mounting seat that is defined between an upper jaw portion and a lower jaw portion provided on the distal end side of a holder of an insert detachable cutting tool and extends toward the center in the axial direction of the holder. In addition, they are inserted while their axial directions coincide with each other. The cutting insert inserted into the insert mounting seat is such that the upper surface and the lower surface of the insert body are in contact with the upper jaw portion and the lower jaw portion, respectively, and the cutting edge of one cutting edge portion is axially outward from the tip of the holder. The clamp is held in a state of slightly protruding.

An insert detachable cutting tool having a cutting insert mounted on the holder in this way is directed to a work piece rotated at a high speed by holding a shank portion provided on the rear end side of the holder with a machine tool such as a lathe. By cutting the cutting edge protruding from the tip of the holder into the work piece while moving forward, the work piece can be cut. In addition, for example, the holder is moved horizontally along the rotation axis of the work piece while cutting the blade into the work piece, and the work piece is widened by reciprocating within a predetermined width range. It is also possible to form a groove.
JP-T-2002-524272 Registered Utility Model No. 3063685

  However, in the cutting insert as described above and an insert detachable cutting tool equipped with the cutting insert, the cutting waste generated when cutting the work piece clamps the cutting insert from the cutting blade through the upper surface of the cutting blade portion. There is a problem that the upper jaw is worn by rubbing against the upper jaw. Therefore, when wear occurs in the upper jaw in this manner, the cutting insert cannot be securely held on the insert mounting seat, and the holder must be replaced.

  SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a cutting insert capable of preventing a holder holding a cutting insert from being worn by cutting waste and an insert detachable cutting tool to which the cutting insert is detachably attached. And

  In order to achieve the above object, the present invention provides the following means.

The cutting insert of the present invention is a cutting insert provided with cutting edge portions each having a cutting edge on the front end side and the rear end side in the axial direction of the substantially rod-shaped insert main body, wherein the insert main body is on the center side in the axial direction. And an upper surface protruding upward from the cutting edge portion and clamped and held by the upper jaw portion of the holder, and a recess is provided in each of the upper surface portions located on the center side in the axial direction from both ends in the axial direction. Protrusions projecting upward are respectively provided between the upper ends of the cutting blades on both ends in the axial direction, and the projecting height of the projecting parts is as viewed from the side of the side of the insert body. It is characterized by being made equal to the upper surface of the insert body .

Further, the insert detachable cutting tool of the present invention is a holder provided with a groove-shaped insert mounting seat extending in the axial direction center side between an upper jaw portion and a lower jaw portion formed on the distal end side. An insert detachable cutting tool in which the cutting insert is detachably attached, wherein an engaging portion is formed at the tip of the upper jaw, and the engaging portion is disposed on the tip in the axial direction of the holder. And the tip of the upper jaw is disposed on the axially central side of the projection of the cutting insert.

  According to the cutting insert and the insert detachable cutting tool of the present invention, since the protruding portion protruding upward is provided between the upper surface of the insert body of the cutting insert and the upper surface of the cutting edge portion, the cutting insert is provided. With the clamp held, a protrusion can be placed between the upper jaw part of the holder of the insert detachable cutting tool and the cutting blade. When cutting the work, it passes through the upper surface side of the cutting blade part. The cutting waste sent to the upper jaw side can be applied to the protrusion. Thereby, since it can prevent that cutting wastes hit especially the front end side of an upper jaw part, it can prevent that an upper jaw part wears with cutting waste. On the other hand, cutting inserts with protrusions are usually made of a material that is harder than the holder, so that the protrusions are less likely to be lost due to wear before the cutting edge life, so the cutting inserts will last for a long time. It is possible to provide a cutting insert and an insert detachable cutting tool that can securely hold the holder and enable use of the holder.

  Hereinafter, a cutting insert and an insert detachable cutting tool according to an embodiment of the present invention will be described with reference to FIGS. One embodiment of the present invention relates to a cutting insert used for, for example, grooving or parting off a workpiece, and an insert detachable cutting tool to which the cutting insert is detachably attached.

  As shown in FIGS. 1 to 5, the cutting insert 1 of the present embodiment is formed in a substantially rod shape using a hard material such as a cemented carbide, and the front end 1 a side and the rear end in the direction of the axis O <b> 1 extending in the longitudinal direction thereof. This is a so-called dogbone type having cutting edges 2a on the 1b side (both ends). The cutting insert 1 is provided on an insert main body 3 formed in a substantially rod shape, on both end portions 3a and 3b sides of the insert main body 3, and has a cutting edge 2a on both end portions 3a and 3b sides. And a cutting edge portion 2 having a substantially rectangular shape in plan view. The cutting insert 1 includes a plane that bisects the cutting insert 1 at the center in the direction of the axis O1 perpendicular to the axis O1, and a plane that bisects the cutting insert 1 at the center in the width direction along the axis O1. It is formed so as to exhibit a symmetrical shape as a reference plane.

  The insert main body 3 includes a main body portion 4 clamped and held by an upper jaw portion and a lower jaw portion of a holder of an insert detachable cutting tool, which will be described in detail later, and an axial O1 direction from both ends 4a and 4b in the axis O1 direction. It is comprised from the extension part 5 extended toward the outer side. In the present embodiment, as shown in FIG. 2, the main body 4 includes an upper surface 4d and a lower surface 4e that are parallel to each other when viewed from the side surface 4c along the axis O1, and is viewed from the upper surface 4d side. A recess 4f extending in the width direction perpendicular to the axis O1 while being recessed toward the lower surface 4e is provided in a portion slightly located on the center side in the axis O1 direction from both ends 4a and 4b in the axis O1 direction. Thus, on both ends 4a and 4b side on the upper surface 4d side of the main body portion 4, a protruding portion 4g extending in the width direction is provided between the upper surface 2b of the cutting blade portion 2 and protruding upward.

  Further, as shown in FIGS. 1 to 5, the main body 4 has an upper surface 4d and a lower surface 4e positioned between a pair of recesses 4f provided on both ends 4a and 4b in the direction of the axis O1. Each is formed so as to exhibit a concave V shape in a cross-sectional view orthogonal to each other, and extends along the axis O1. Further, the two side surfaces 4c connecting the upper surface 4d and the lower surface 4e are formed in a planar shape parallel to the axis O1 and parallel to each other.

  The recess 4f is recessed on the lower surface 4e side, while the protrusion 4g is formed to have a substantially arcuate shape that is convex upward when viewed from the side surface 4c side of the main body 4. Thus, the protruding height is substantially equal to the upper surface 4d when viewed from the side surface 4c side of the main body 4. Further, an engagement receiving surface 4h that is substantially V-shaped when viewed from the outside in the axis O1 direction is provided on the inner surface portion that is connected to the upper surface 4d of the recess 4f and faces the outside in the axis O1 direction. The engagement receiving surface 4h gradually moves from the side surface 4c side along the axis O1 of the main body portion 4 toward the center in the width direction, and gradually from the lower end side toward the upper end connected to the upper surface 4d of the main body portion 4. Are formed so as to extend toward the center in the direction of the axis O1.

  On the other hand, the extending portion 5 extends from both ends 4a and 4b in the axis O1 direction of the main body portion 4 toward the outer side in the axis O1 direction, and the lower surface 5a and both side surfaces 5b along the axis O1 are connected to the main body portion 4. The lower surface 4e and the both side surfaces 4c are flush with each other. In addition, the upper end 5c of the extension part 5 is positioned below the upper surface 4d of the main body part 4, and gradually inclines downward from both ends 4a and 4b of the main body part 4 toward the outside in the direction of the axis O1, respectively. The part located on the outer side in the axis O1 direction (the part on the both end portions 3a, 3b side of the insert main body 3) is formed so as to be gradually inclined upward toward the outer side in the axis O1 direction. An end surface 5d of the extending portion 5 that forms both end portions 3a and 3b of the insert main body 3 is formed so as to be perpendicular to the axis O1 direction, and is formed so as to be orthogonal to the axis O1. The contact surface is in contact with the support surface.

  On the other hand, the pair of cutting blade portions 2 have lower ends connected to the upper ends 5c of the extending portions 5, and rear ends positioned on the center side in the axis O1 direction are connected to both ends 4a and 4b of the main body portion 4, respectively. Yes. Further, the upper surface 2b of the cutting edge portion 2 is arranged below the upper surface 4d while being parallel to the upper surface 4d of the main body portion 4, and has an inclined surface 4i extending gradually downward toward the outer side in the axis O1 direction. The upper end surface of the protrusion 4g on both ends 4a and 4b side of the main body 4 is connected to the upper end surface. Furthermore, the side surface 2c of the cutting edge portion 2 is formed so as to be gradually inclined outward in the width direction as it goes upward while connecting the lower end to the upper end of the side surface 5b of the extending portion 5, thereby the cutting edge portion 2. Is formed such that its width gradually increases from the lower end connected to the upper end 5c of the extending portion 5 toward the upper surface 2b. Further, the end face 2d facing the outer side in the axis O1 direction of the cutting edge part 2 extends toward the outer side in the axis O1 direction gradually from the lower end toward the upper face 2b while connecting the lower end to the upper end of the end face 5d of the extending part 5. It is formed as follows. And the cutting blade 2a is formed in the intersection ridgeline part of the end surface 2d of the cutting blade part 2, and the upper surface 2b.

  The cutting insert 1 configured as described above is used by being mounted on a holder 20 of an insert detachable cutting tool 10 as shown in FIGS. The holder 20 is formed of steel or the like, and has a square columnar shank portion 21 on the rear end 20b side and slightly on the front end 20a side from the side surface 21a of the shank portion 21 as shown in FIGS. The head portion 22 protrudes laterally and protrudes so that the upper portion rises from the upper surface 21 b of the shank portion 21. That is, the cutting insert 1 is made of a material harder than the holder 20.

  The head portion 22 is formed with a slit 23 extending from the tip 22a side (the tip 20a side of the holder 20) along the extended surface of the upper surface 21b of the shank portion 21, and a portion above the slit 23 is formed. The upper jaw 24 is the lower jaw 25. In addition, the upper jaw portion 24 is formed so that the height in the vertical direction perpendicular to the upper surface 24 a is smaller than that of the lower jaw portion 25, and the cross-sectional area of the connecting portion with the shank portion 21 side defined by the slit 23 is It is formed smaller than the cross-sectional area of the connection portion with the shank portion 21. And this upper jaw part 24 is made elastically deformable so that it may bend toward the lower jaw part 25 side by using this connection part as a fulcrum. Further, as shown in FIGS. 11 and 12, the head portion 22 has a screw hole 26 penetrating vertically from the upper surface 24a of the upper jaw portion 24 through the slit 23 to the lower surface 25a of the lower jaw portion 25 in the direction perpendicular to the axis O2. Is provided. Here, as shown in FIG. 7, a clamp screw 27 is screwed into the screw hole 26, and the upper jaw portion 24 and the lower jaw portion 24 are elastically deformed according to the screwing amount of the clamp screw 27. 25 is variable.

  The lower jaw portion 25 is formed so that the tip 25b side extends in a rectangular flat plate shape along the side surface 21a of the shank portion 21, and the upper jaw portion 24 has a tip 24b portion on the side surface 21a side of the lower jaw portion 25. It is formed in a substantially triangular plate shape having an inclined surface 24g that goes downward along the flat plate toward the tip 24b side. Further, in the present embodiment, the upper jaw portion 24 is formed with an engaging portion 24c on the distal end 24b side, and the distal end of the engaging portion 24c is more than the distal end 25b of the lower jaw portion 25 with respect to the axis O2 of the holder 20. It is arranged on the direction rear end 20b side.

  An insert mounting seat 29 is formed in the groove portion of the slit 23 on the side where the lower jaw portion 25 extends in the shape of a rectangular flat plate. The insert mounting seat 29 is formed so as to open to the front end 20a of the holder 20 and extend to the rear end 20b side (rear end 22b side of the head portion 22), and each of the upper jaw portion 24 side and the lower jaw portion 25 side. In addition, a pair of contact surfaces 24d and 25c that are vertically opposed to each other are formed. In the cross section orthogonal to the longitudinal direction, one contact surface 24d on the upper jaw portion 24 side faces the other contact surface 25c on the lower jaw portion 25 side, and the other contact surface 25c is one contact surface 24d. It is formed so as to exhibit a V-shape that is convex toward the surface. Further, the pair of contact surfaces 24d and 25c extend straight along the longitudinal direction from the front ends 24b and 25b of the upper jaw portion 24 and the lower jaw portion 25 toward the rear end 22b of the head portion 22, respectively. .

  Furthermore, one contact surface 24d on the upper jaw portion 24 side is connected to an engagement surface 24e facing the rear end 20b side (inner side) in the axis O2 direction of the engagement portion 24c formed at the distal end 24b of the upper jaw portion 24. Yes. Here, the engaging portion 24c has a lower end surface that is flush with the protruding end of the one abutting surface 24d that has a convex V-shape toward the other abutting surface 25c. The engaging surface 24e is formed so as to extend downward from the upper end connected to one of the contact surfaces 24d to the lower end of the engaging portion 24c. Further, the engagement surface 24e is directed inward from the both side surfaces 24f side of the distal end 24b side along the axis O2 of the upper jaw portion 24, and from the lower end side of the engagement portion 24c to one contact surface of the upper jaw portion 24. It is formed so as to gradually extend toward the rear end 20b in the direction of the axis O2 as it goes to 24d. As shown in FIGS. 6 to 7, the cutting insert 1 is mounted on the insert mounting seat 29 as shown in FIGS. The engagement surface 24e is engaged with the engagement receiving surface 4h of the cutting insert 1 while being in surface contact.

  On the other hand, a support surface 30 is formed on the rear end 29a side of the insert mounting seat 29 so as to face the front end 20a in the longitudinal direction of the holder 20, and this support surface 30 is an extension of the pair of contact surfaces 24d and 25c. It is formed so as to be orthogonal to the installation direction (the direction of the axis O2 of the holder 20).

  Next, a method for mounting the cutting insert 1 having the above-described configuration on the holder 20 and a method for cutting a workpiece using the insert detachable cutting tool 10 having the cutting insert 1 attached to the holder 20 will be described. The operation and effect of the cutting insert 1 and the insert detachable cutting tool 10 will be described.

  First, the screwing amount of the clamp screw 27 screwed into the screw hole 26 of the holder 20 is adjusted so that the vertical height of the insert mounting seat 29 is substantially equal to the height of the cutting insert 1. The cutting insert 1 is inserted into the insert mounting seat 29 while aligning the directions of the axes O1 and O2. At this time, the cutting insert 1 is inserted such that the contact surface 5 d of the extending portion 5 facing the rear end 29 a side of the insert mounting seat 29 comes into contact with the support surface 30 of the insert mounting seat 29. Here, in the present embodiment, the convex V-shaped projecting end formed by one abutting surface 24d of the upper jaw portion 24 of the holder 20 and the lower surface of the engaging portion 24c connected to the lower end of the engaging surface 24e are flush with each other. As a result, it is not necessary to lift the upper jaw part 24 by elastically deforming the upper jaw part 24 to a height where the protruding part exceeds the upper surface 4d of the cutting insert 1 like a conventional holder provided with a protruding part on the upper jaw part. The mounting operation of the cutting insert 1 to the insert mounting seat 29 is easy.

  In this stage, when the cutting insert 1 is inserted into the insert mounting seat 29, the clamp screw 27 is screwed into the screw hole 26, and the one abutment surface 24d on the upper jaw portion 24 side is used as the upper surface of the main body portion 4 of the cutting insert 1. The cutting insert 1 is clamped and held by the upper jaw portion 24 and the lower jaw portion 25 in contact with 4d.

  At this time, in the insert detachable cutting tool 10 of the present embodiment, when the clamp screw 27 is operated so as to abut one abutting surface 24d on the upper jaw 24 side, first, the engagement of the upper jaw 24 is performed. The joint portion 24c is inserted into the recess 4f arranged on the outer side in the axis O2 direction, and the engaging portion 24c formed at the tip 24b of the upper jaw portion 24 contacts the cutting insert 1, that is, one of the upper jaw portions 24 Before the abutting surface 24d abuts on the upper surface 4d of the cutting insert 1 to clamp and hold the cutting insert 1, the engaging surface 24e of the engaging portion 24c abuts on the engaging receiving surface 4h. When the engagement surface 24e comes into contact with the engagement receiving surface 4h, the cutting insert 1 is pressed inward in the direction of the axis O2 of the holder 20, and the engagement is performed according to further screwing of the clamp screw 27. The surface 24e is engaged so as to gradually come into surface contact with the engagement receiving surface 4h, and accordingly, the cutting insert 1 shifted to the outside in the axis O2 direction of the holder 20 moves while being guided inward in the axis O2 direction. It will be. At the same time, the engagement receiving surface 4h extends inward from the both ends (both side surfaces 4c) in the width direction of the upper surface 4d toward the center in the direction of the axis O1, so that the cutting insert 1 is centered in the width direction. It will be guided and positioned even if it faces. Then, with the engagement surface 24e and the engagement receiving surface 4h completely engaged, the cutting insert 1 is disposed at a predetermined position in both the axis O2 direction and the width direction, and the contact surface 5d and the support surface 30 are disposed. Is held in a clamped state. As a result, in the insert detachable cutting tool 10 of the present embodiment, the cutting insert 1 is surely arranged at a predetermined position when the engagement receiving surface 4h and the engagement surface 24e are completely engaged while being in surface contact. Thus, the cutting blade 2a protruding outward from the tip 20a of the holder 20 in the direction of the axis O2 can be reliably disposed at a predetermined position. Further, in the insert detachable tool 10 in which the cutting insert 1 is attached to the holder 20 in this way, the protruding portion 4g is interposed between the axial lines O1 and O2 between the tip 24b of the upper jaw portion 24 and the cutting edge portion 2. It will be. In such an attached state, the inclined surface 24g facing the outer side in the axis O2 direction of the upper jaw portion 24 recedes more than the inclined surface 4i of the protruding portion 4g, and the inclination is gentle.

  The insert detachable cutting tool 10 of the present embodiment is fixed by holding the shank portion 21 of the holder 20 with a machine tool such as a lathe, for example, toward a work piece rotated at a high speed, for example. The workpiece can be cut by cutting the cutting edge 2a of the cutting insert 1 into the workpiece while moving forward. Further, for example, the holder 20 is relatively horizontally moved along the rotation axis of the work piece while maintaining the state in which the cutting edge 2a of the cutting insert 1 is cut into the work piece, and has a predetermined width. A wide groove is formed in the work piece by reciprocating in the range.

  On the other hand, when cutting the workpiece in this way, the main component force of the cutting resistance acts in the vertical direction of the cutting insert 1, and in particular, the cutting edge portion 2 of the cutting insert 1 is displaced in the width direction. Feed force acts. Further, by pressing the cutting edge 2a of the cutting insert 1 against the work piece, a reaction force from the work piece acts on the cutting insert 1 in the direction of the substantially axis O1. For this reason, at the time of cutting, a force such as to be removed from the insert mounting seat 29 constantly acts on the cutting insert 1 held by the clamp, but the cutting insert 1 of the present embodiment has the upper jaw portion 24 and the lower jaw portion in the vertical direction. 25, and the direction of the axis O1 is reliably held by the engagement of the engagement surface 24e and the engagement receiving surface 4h in addition to the contact between the contact surface 5d and the support surface 30. The cutting insert 1 is not displaced from the insert mounting seat 29 with cutting. Thereby, when the workpiece is cut using the insert detachable cutting tool 10 of the present embodiment, the workpiece can be cut with high accuracy.

  Further, cutting waste generated by cutting passes through the upper surface 2b side of the cutting edge portion 2 and is sent to the upper jaw portion 24 side. In the present embodiment, the cutting waste passing through the upper surface 2b side of the cutting blade portion 2 hits the inclined surface 4i of the projection 4g interposed between the cutting blade portion 2 and the tip 24b of the upper jaw portion 24. Become. And since the inclined surface 24g of the upper jaw part 24 located behind the projection part 4g is gently formed with respect to this inclined surface 4i, the advancing direction is an upper side against the inclined surface 4i of the projection part 4g. The cutting waste that has been changed into the upper jaw 24 does not hit the tip 24b side of the upper jaw 24, or even when it hits the tip 24b of the upper jaw 24, the impact force is considered to be small, and the upper jaw 24 is cut. Is prevented from wearing. Moreover, since the protrusion 4g is a part of the cutting insert 1 and is formed of a material harder than the holder 20, the protrusion 4g is used for cutting the workpiece by hitting cutting waste. It is assumed that it will not be worn earlier than the cutting edge 2a.

  Therefore, according to the cutting insert 1 and the insert detachable cutting tool 10 described above, the protrusion 4 g is provided between the upper surface 4 d of the insert body 3 of the cutting insert 1 and the upper surface 2 b of the cutting edge portion 2, and the holder 20 When the cutting insert 1 is mounted, the protrusion 4g is disposed between the tip 24b of the upper jaw portion 24 of the holder 20 and the cutting blade portion 2, whereby the upper surface 2b of the cutting blade portion 2 from the cutting blade 2a. Since it is possible to prevent the cutting waste passing through the side from hitting the protrusion 4g and coming into contact with the vicinity of the tip 24b of the upper jaw 24, it is possible to prevent wear of the upper jaw 24 due to the cutting scraping and rubbing. It is possible. Thereby, it becomes possible to extend the lifetime of the holder 20 which clamps and holds the cutting insert 1 so that attachment or detachment is possible.

  In addition, this invention is not limited to said one Embodiment, In the range which does not deviate from the meaning, it can change suitably. For example, in the present embodiment, the cutting edge portion 2 of the cutting insert 1 has a substantially square shape in plan view from the upper surface 2b side, and the cutting insert 1 has two cutting inserts 1 perpendicular to the axis O1 and in the center of the axis O1 direction. It is assumed that the plane that is equally divided and the plane that equally divides the cutting insert 1 into two at the center in the width direction along the axis O1 are formed so as to exhibit a symmetrical shape, respectively. Cutting insert provided with a cutting edge 2a having a right-handed or left-handed approach angle to a linear cutting edge 2a intersecting the axis O1, and a cutting edge 2a having a substantially circular shape in plan view from the upper surface 2b side It may be applied to.

It is a perspective view which shows the cutting insert which concerns on one Embodiment of this invention. It is a side view which shows the cutting insert which concerns on one Embodiment of this invention. FIG. 3 is a view taken along line XX in FIG. 2. FIG. 3 is a view taken along line YY in FIG. 2. FIG. 3 is a view taken along line ZZ in FIG. 2. It is a side view which shows the insert detachable cutting tool which concerns on one Embodiment of this invention. FIG. 7 is a view taken along line XX in FIG. 6. It is a YY line arrow directional view of FIG. It is a side view of the holder of the insert detachable cutting tool concerning one embodiment of the present invention. FIG. 10 is an enlarged view showing the head part of FIG. 9. It is the perspective view which showed the head part of FIG. It is a XX arrow directional view of FIG. It is a YY line arrow directional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting insert 1a Tip 1b Rear end 2 Cutting edge part 2a Cutting edge 2b Upper surface 3 Insert main body 4 Main body part 4d Upper surface 4e Lower surface 4f Recess 4g Projection part 4h Engagement receiving surface 4i Inclined surface 5 Extension part 5d End surface (Contact surface) )
DESCRIPTION OF SYMBOLS 10 Insert detachable cutting tool 20 Holder 20a Front end 20b Rear end 22 Head part 24 Upper jaw part 24b Front end 24c Projection part 24d One contact surface 24e Engagement surface 24g Inclined surface 25 Lower jaw part 25c The other contact surface 29 Insert mounting seat 30 Support surface O1 Cutting insert axis O2 Holder axis

Claims (2)

In the cutting insert provided with a cutting edge portion having a cutting edge on the front end side and the rear end side in the axial direction of the substantially rod-shaped insert body,
The insert body includes an upper surface on the central side in the axial direction that protrudes above the cutting edge and is clamped and held by the upper jaw of the holder ,
A recess is provided in each of the upper surface portions located on the center side in the axial direction from both ends in the axial direction, and a protrusion protruding upward between the upper surface of the cutting blade portion on both ends in the axial direction of the recess. Each part is provided ,
A cutting insert characterized in that a protruding height of the protruding portion is made equal to an upper surface of the insert body as viewed from the side surface side of the insert body . An insert detachable type in which the cutting insert according to claim 1 is detachably attached to a holder provided with a groove-shaped insert mounting seat extending in the axial center between the upper jaw portion and the lower jaw portion formed on the distal end side. A cutting tool,
An engaging portion is formed at the tip of the upper jaw, and the engaging portion is inserted into the recess disposed on the tip in the axial direction of the holder,
And the tip of the said upper jaw part is arrange | positioned in the said axial direction center side of the said projection part of the said cutting insert, The insert detachable cutting tool characterized by the above-mentioned.

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