JP5264200B2 - Cutting tools - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain simplification of the structure of a main spindle of a machine tool mounted with a cutting tool, in the cutting tool for cutting a surface of a hole and a peripheral edge of an opening part. <P>SOLUTION: In the cutting tool 1, on an approximately conical tool body 2 rotated around an axis O, a hole working tool 5 advanceable/retreatable in an axis O direction and a slide part 7 provided with a cutting blade insert 6 and made slidable in a generating line of a cone surface are rotatably provided so as to be integrated with the tool body 2. At the inside of the tool body 2, an approximately cylindrical coupling part 11 for advanceably/retreatably inserting a rear end part of a hole working tool 5 and a sleeve 12 for clamping this in the axis O direction is provided advanceably/retreatably in the axis O direction. The slide part 7 is interlocked with advancement/retreating of the coupling part 11 to be made slidable, and a projection part 12A projected to an outer side in a radial direction is formed on the sleeve 12 arranged at an inner side of the coupling part 11. Engagement parts 14, 16 abuttable with the projection part 12A in the axis O direction are formed on a distal end part and a rear end part of the coupling part 11 respectively. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a cutting tool that is particularly suitable for cutting a hole and a peripheral surface of an opening thereof.

Conventionally, a stem guide hole for guiding a shaft portion of a valve in a cylinder head of an engine and a cutting tool for processing the periphery of the opening portion of the stem guide hole are rotated around an axis line as in Patent Document 1, for example. A reamer is attached to the tip of the substantially truncated cone-shaped tool body so that the reamer can move forward and backward along the axis, and the cutting blade insert is positioned so that the cutting blade insert is positioned at the root of the reamer. Some of them are configured to be attached to a slide portion that can slide along a shape bus.
In this cutting tool, the inner peripheral surface of the stem guide hole is finished with a reamer, and at the same time, the peripheral edge of the opening can be formed into a tapered surface by a cutting blade insert.

  In the above cutting tool, the rear end of the tool body can be moved forward and backward with respect to the tool body with the cylindrical coupling directed in the axial direction, and can rotate integrally with the tool body about the axis. A connecting pin attached to the slide part is removably inserted into and connected to a hole formed in the coupling and inserted into the inside and inclined in the axial direction. With this configuration, when the coupling is advanced and retracted in the axial direction, the slide portion slides in the generatrix direction in conjunction with the advance and retreat operation.

Further, the slide shaft provided with the chuck for gripping the shank portion at the rear end of the reamer is capable of moving forward and backward with respect to the tool body and the coupling in the axial direction, and the tool body and the coupling around the axis. The tool body is further inserted through the inner periphery of the coupling so as to be integrally rotatable. Accordingly, the reamer advances and retracts in the axial direction by moving the slide shaft in the axial direction.
Japanese Patent No. 2748846

However, in the conventional cutting tool described above, the slide shaft and the coupling are configured to advance and retreat individually with respect to the tool body. Therefore, the machine tool to which the cutting tool is attached rotates the tool body around the axis. In addition to the drive shaft to be driven, it is necessary to provide a main shaft structure including both a drive shaft for moving the slide shaft back and forth in the axial direction and a drive shaft for moving the coupling back and forth in the axial direction.
Further, when the main shaft structure is complicated, there is a problem that it is difficult to ensure the rigidity of the main shaft structure. In particular, recently, the engine has a tendency to increase in performance and size, and accordingly, it is necessary to reduce the diameter of the cutting tool. However, it is particularly difficult to ensure the rigidity in the complex spindle structure described above. Problems arise.

  The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a cutting tool that can simplify the spindle structure of a machine tool and can easily ensure the rigidity of the spindle structure. And

In order to achieve the above object by solving the above-described problems, a cutting tool according to the present invention has a hole that can be advanced and retracted along the axis at the tip of a substantially conical tool body that is rotated around the axis. At the same time as attaching the machining tool, a slide part having a cutting edge insert on the tip side is slidably mounted along the generatrix of the conical surface of the tool body, and the hole machining tool and the slide part are connected to the tool body. A cutting tool that is integrally rotatable, and a substantially cylindrical coupling portion for inserting a rear end portion of the hole drilling tool is provided in the tool main body so as to be movable back and forth along the axis. The slide part is coupled to the coupling part so as to slide in conjunction with the advancement and retraction of the coupling part, and further inside the coupling part inside the tool body, the rear of the drilling tool. To grip the edge The sleeve is inserted so as to be able to advance and retreat along the axis, and an annular first locking portion that protrudes inward in the radial direction and can be inserted only through the hole machining tool is formed at the tip of the coupling portion, At the rear end portion of the coupling portion, an annular second engaging portion that protrudes inward in the radial direction and through which the sleeve can be inserted is formed, and the sleeve disposed inside the coupling portion includes: A locked portion that protrudes radially outward from a portion in the circumferential direction and is capable of contacting the locking portion is formed, and an inner peripheral surface of the coupling portion is formed on the covered portion at a portion in the circumferential direction. A slit is formed so that only the locking part can be inserted and the locked part can be slid along the axis .

In the cutting tool of this configuration, the drilling tool can be moved forward and backward along the axis by simply moving the sleeve fixed to the rear end of the drilling tool along the axis, and the slide part can be conical on the tool body. Can be slid along the generatrix.
For example, in a state where the latched portion of the sleeve is located between two latching portions, that is, in a state where the latched portion is not in contact with any of the two latching portions, the sleeve is set to the axis. When driven back and forth along, only the hole drilling tool moves back and forth along the axis. In this case, since the slide portion does not move back and forth, the coupling portion does not move.

For example, in a state where the locked portion of the sleeve is in contact with the first locking portion or the second locking portion, the sleeve is pressed against the first locking portion or the second locking portion. Is driven along the axis, the coupling part moves forward and backward along the axis together with the hole machining tool. Then, the slide part slides along the bus bar in conjunction with the advancement and retreat of the coupling part.
Therefore, the machine tool to which the cutting tool is attached only needs to have a main shaft structure including a drive shaft for moving the sleeve back and forth along the axis in addition to the drive shaft for rotating the tool body. That is, the main shaft structure can be simplified and the rigidity can be easily secured.

Moreover, in the said cutting tool, the movement to the circumferential direction of the to-be-latched part with respect to a coupling part can be controlled with a slit, enabling a to-be-latched part to move along an axis line within a slit. In addition, since the coupling part is connected with the slide part with which the tool main body was mounted | worn so that it may slide along the said bus | bath, it does not rotate with respect to a tool main body.
Therefore, while allowing the sleeve and the drilling tool to move back and forth along the axis with respect to the tool body, the rotation of the sleeve and the drilling tool with respect to the tool body is restricted, and the sleeve and the drilling tool rotate together with the tool body. It becomes possible to make it.

  Furthermore, in the cutting tool, a notch that allows the locked portion to be inserted along the axis is formed in a part of the inner circumferential edge of the second locking portion along the axis, Arranged at different positions in the circumferential direction with respect to the slit, the upper end portion of the slit extends in the circumferential direction to the lower end side of the notch, and the locked portion is circumferentially disposed between the slit and the notch. A communication groove that is slidable may be formed.

In this configuration, the sleeve and the drilling tool held by the sleeve can be easily attached to and detached from the coupling portion, that is, the drilling tool can be easily replaced.
Specifically, when removing the sleeve and the hole machining tool from the coupling portion, the sleeve is rotated around the axis so that the locked portion moves in the communication groove from the upper end of the slit to the lower end of the notch, Thereafter, the sleeve may be moved to the rear end side of the coupling portion along the axis so that the locked portion passes through the notch.
When attaching the sleeve and drilling tool to the coupling part, after inserting the drilling tool from the rear end side of the coupling part, the sleeve is moved along the axis so that the locked part passes through the notch. Then move it to the tip of the coupling. Then, the sleeve may be rotated around the axis so that the locked portion moves in the communication groove from the lower end side of the notch to the upper end portion of the slit.

  According to the present invention, the hole drilling tool can be advanced and retracted along the axis line and the slide portion can be slid along the generatrix of the conical surface of the tool body simply by driving the same sleeve forward and backward. The spindle structure of the machine can be simplified and the rigidity can be easily secured.

Hereinafter, an embodiment of a cutting tool according to the present invention will be described with reference to FIGS. 1 to 4. In addition, the cutting tool described here processes the stem guide hole for guiding the shaft portion of the valve in the cylinder head and the periphery of the opening (valve seat surface) of the stem guide hole in the same manner as the conventional cutting tool described above. To do.
As shown in FIG. 1, the cutting tool 1 in the present embodiment has a tool body 2 having a substantially multi-stage cylindrical shape centered on an axis O, and the tip of the tool body 2 has an axis O. It is formed in a substantially truncated cone shape that gradually decreases in diameter toward the tip side as the center. On the other hand, a projecting portion 2A having a substantially cylindrical shape centering on the axis O is formed on the rear end surface of the tool body 2. The protrusion 2A can be inserted into a recess 3A formed in an adapter 3 for attaching the cutting tool 1 to a drive shaft of a machine tool such as a machining center, for example.

  A mounting hole 2B is formed along the axis O at the tip of the tool body 2, and a reamer (hole processing tool) 5 for finishing the stem guide hole is inserted into the mounting hole 2B via the bush 4. Are attached coaxially to the axis O. Here, the reamer 5 can be advanced and retracted along the axis O inside the bush 4, and can be projected and retracted with respect to the tip of the bush 4. The advancement / retraction of the reamer 5 is performed by a sleeve 12 described later being driven forward / backward by a drive shaft of a machine tool.

  A cutting insert (not shown) for roughing the valve seat surface and a cutting blade insert 6 for finishing and cutting the valve seat surface are disposed at the tip of the truncated cone shape of the tool body 2 to which the reamer 5 is attached. Yes. Here, the cutting blade insert 6 is provided at the distal end portion of the slide portion 7 that is slidably mounted along the generatrix of the conical surface constituting the tool body 2.

  That is, a concave groove 9 extending along the generatrix is formed on the conical surface of the tool body 2, and the above-described slide portion 7 is disposed in the concave groove 9. Further, an engaging portion (not shown) extending along the generatrix is formed on the inner surface of the concave groove 9 and the outer surface of the slide portion 7 facing the inner surface of the concave groove 9 is engaged with the engaging portion. An engaged portion (not shown) is formed. Therefore, the slide part 7 is slidably attached to the tool body 2 in a state where the engaging part and the engaged part are engaged.

On the other hand, a hole 2C having a diameter larger than the attachment hole 2B is formed along the axis O at the rear end of the tool body 2 so as to communicate with the attachment hole 2B. The hole 2C has a substantially cylindrical shape. The coupling portion 11 is inserted along the axis O so as to be able to advance and retract. Further, a rear end portion of the reamer 5 is inserted inside the coupling portion 11 of the hole 2C, and a sleeve 12 for gripping the rear end portion of the reamer 5 is inserted.
The front end portion of the sleeve 12 formed in a substantially cylindrical shape is disposed inside the coupling portion 11. Also, as shown in FIGS. 1 to 4, a pair of protrusions (locked portions) 12 </ b> A and 12 </ b> A are formed at the distal end of the sleeve 12 so as to protrude radially outward from the outer peripheral surface in opposite directions. Yes. The rear end of the reamer 5 is inserted into the sleeve 12.

The inner circumferential hole of the sleeve 12 has a first hole 21 that opens to the tip end side, a second hole 22 that is one step smaller in diameter than the first hole 21, and a one step smaller diameter than the second hole 22. The third hole 23 is continuously provided.
A female screw is formed on the inner peripheral surface of the first hole 21, and a nut member 25 is screwed into the female screw portion. Here, the nut member 25 is configured by forming the gear teeth 26 on the outer peripheral surface on the front end side and forming the male screw to be screwed into the female screw of the first hole 21 on the outer peripheral surface on the rear end side. Yes. Note that the gear teeth 26 of the nut member 25 are arranged at positions protruding from the opening of the inner peripheral hole of the sleeve 12.

A chuck 30 for supporting the reamer 5 is inserted into the second hole 22. The chuck 30 includes a pair of chuck members 31 and 32 arranged so as to be vertically arranged in the direction of the axis O, and a collet 33 arranged inside the chuck members 31 and 32 in the radial direction.
The chuck members 31 and 32 are formed in a substantially cylindrical shape having an outer diameter that can be inserted into the second hole 22. The chuck member 31 disposed at the most distal end side in the chuck 30 is brought into contact with a surface facing the rear end side of the nut member 25, and the chuck member 32 disposed at the most rear end side is a bottom portion of the second hole 22. It is made to contact | abut on the side. The pair of chuck members 31 and 32 are arranged with an interval in the direction of the axis O. Further, tapered portions 31A, 32A that gradually increase in diameter toward the other chuck member 32, 31 side are formed on the inner peripheral side of these chuck members 31, 32, respectively.

  The collet 33 has a substantially cylindrical shape whose outer peripheral side is in close contact with the tapered portions 31 </ b> A and 32 </ b> A, and a plurality of slits along a plane including the central axis of the collet 33 are formed in the cylindrical wall portion. (Not shown) is formed. And the part pinched | interposed into this slit bends in the radial inside with respect to a center axis | shaft, and the internal diameter of the collet 33 will be reduced. A rear end portion of the reamer 13 is inserted on the inner peripheral side of the collet 33.

The tool body 2 is provided with a moving member 35 that rotates the nut member 25 to move in the direction of the axis O so as to advance and retreat. The moving member 35 is disposed in a conical portion of the tool body 2 located radially outside the mounting hole 2B, and has a cylindrical shape extending in parallel with the axis O.
On the rear end side of the moving member 35, a worm gear portion 39 having a disc shape and having worm teeth 37 on the outer periphery thereof is formed. The worm teeth 37 are formed so as to mesh with the gear teeth 26 of the nut member 25, and the nut member 25 can be moved in the direction of the axis O by rotating the moving member 35 in a state where these mesh with each other. Further, an engaging hole 40 that engages with a work tool such as a hexagon stick wrench is formed on the distal end side of the moving member 35, and the engaging hole 40 is exposed outward from the conical surface of the tool body 2. doing.

The coupling part 11 provided inside the tool body 2 is constituted by a coupling body 13 and a lid (second locking part) 14.
The coupling body 13 includes a cylindrical portion 15 and an annular bottom wall portion (first locking portion) 16 that protrudes radially inward from the inner peripheral edge at the distal end portion of the cylindrical portion 15 that faces the bottom surface of the hole 2C. The inner peripheral surface 15A of the cylindrical portion 15 and the through hole 16A of the bottom wall portion 16 are coaxial with the axis O. Here, the dimension of the through-hole 16A of the bottom wall portion 16 is set to a dimension that allows the reamer 5 and the nut member 25 to be inserted but not allowing the sleeve 12 to be inserted.

  As shown in FIG. 4, the inner peripheral surface 15A of the cylindrical portion 15 has a pair of slits 15B extending along the axis O so that the pair of protrusions 12A and 12A can be individually inserted into a part of the circumferential direction. 15B is formed and configured. That is, the sleeve 12 is slidable along the axis O with respect to the coupling portion 11 in a state where the pair of protrusions 12A and 12A of the sleeve 12 are disposed in the slits 15B and 15B. However, the rotation around the axis O is restricted.

  As shown in FIGS. 1 and 2, the lid body 14 is formed by forming a through hole 14 </ b> A centering on the axis O, and in a state where it is fixed to the rear end portion of the cylindrical portion 15, the coupling body As in the case of the bottom wall portion 16 of 13, an annular wall portion protruding radially inward of the cylindrical portion 15 is formed. The diameter of the through hole 14A of the lid 14 is set to a diameter that allows the sleeve 12 and the reamer 5 to be inserted but does not allow the protrusion 12A to be inserted.

Furthermore, a pair of notches 14B and 14B are formed on the inner peripheral edge of the lid 14 forming the edge of the through hole 14A so that the pair of protrusions 12A and 12A can be individually inserted into a part in the circumferential direction. Yes. Each notch 14B is formed at a different position in the circumferential direction with respect to the slit 15B, and when the protrusion 12A is moved toward the lid 14 along each slit 15B, the sleeve 12 is coupled to the coupling portion 11. To prevent it from coming off.
As shown in FIG. 3, a pair of fan-shaped communication grooves 15C extending in the circumferential direction to the lower end side of each notch 14B is formed at the upper end portion of each slit 15B. In this communication groove 15C, the slit 15B Each protrusion 12A can slide in the circumferential direction between the notch 14B and the notch 14B.

As shown in FIG. 1, the above-described slide portion 7 is connected to the coupling portion 11 configured as described above.
That is, the tool body 2 is formed with a communication hole 2D penetrating from the bottom surface 9A of the concave groove 9 to the bottom of the hole 2C, and the slide portion 7 projects into the hole 2C through the communication hole 2D. A connecting pin 7A is attached. And the slide part 7 and the coupling part 11 are connected by the front-end | tip of the connection pin 7A being inserted in the oblique hole 13A formed in the coupling main body 13. FIG. With this configuration, when the coupling portion 11 is advanced and retracted along the axis O, the slide portion 7 slides along the concave groove 9 in conjunction with the advance and retreat, and is attached thereto. The cutting blade insert 6 slides in a direction oblique to the axis O.
Since the coupling part 11 is connected to the tool body 2 via the slide part 7 as described above, the coupling part 11 is restricted from rotating around the axis O with respect to the tool body 2.

In the cutting tool 1 configured as described above, the reamer 5 is advanced and retracted along the axis O by simply moving the sleeve 12 fixed to the rear end portion of the reamer 5 along the axis O, and a slide portion. 7 can be slid along the concave groove 9.
For example, the protrusion 12A of the sleeve 12 is positioned between the bottom wall portion 16 of the slide portion 7 and the lid body 14, that is, the projection portion 12A contacts both the bottom wall portion 16 and the lid body 14. When the sleeve 12 is driven forward / backward along the axis O in a state in which it is not, only the reamer 5 moves forward / backward along the axis O. In this case, since the coupling portion 11 does not advance and retreat, the slide portion 7 does not move.

  For example, in a state where the protruding portion 12A of the sleeve 12 is in contact with the bottom wall portion 16 or the lid body 14, the sleeve 12 is moved along the axis O so as to press the protruding portion 12A against the bottom wall portion 16 or the lid body 14. When the advance / retreat drive is performed, the coupling unit 11 advances / retreats along the axis O together with the reamer 5. The slide portion 7 slides along the concave groove 9 in conjunction with the advancement and retreat of the coupling portion 11.

A method of processing the above-described stem guide hole and valve seat surface with the cutting tool 1 operating in this manner will be described.
In the above process, first, the valve seat surface is roughly processed by the cutting insert, and then the stem guide hole is finished. When finishing the stem guide hole, the slide portion 7 is slid in advance to move the cutting blade insert 6 away from the axis O so that the cutting blade insert 6 does not contact the valve seat surface. Here, the coupling portion 11 is driven along the axis O by driving the sleeve 12 along the axis O toward the rear end side of the tool body 2 so as to press the protrusion 12A against the lid 14. Move to the rear end side of the main body 2. In this movement, the slide portion 7 slides in the direction away from the axis O along the concave groove 9 in conjunction with the movement of the coupling portion 11, and the cutting blade insert 6 is moved along the axis line in the same manner as the slide portion 7. Move away from O.

  Thereafter, the tool body 2 is rotated around the axis O, and the sleeve 12 is driven forward toward the tip end side of the tool body 2 to finish the inner peripheral surface of the stem guide hole. Here, the stroke in which the reamer 5 can be driven forward without moving the cutting blade insert 6 is equal to the length from the lid 14 to the bottom wall 16 minus the thickness of the protrusion 12A. It is preferable that the tool body 2 is brought close to the stem guide hole in advance so as to ensure a sufficient stroke for finishing.

After finishing the stem guide hole, the tool insert 2 is slightly retracted along the axis O while rotating the tool body 2 to separate the cutting insert from the valve seat surface. Then, the sleeve 12 is driven forward to press the protrusion 12 </ b> A against the bottom wall portion 16, and the coupling portion 11 is moved along the axis O to the tip end side of the tool body 2. At this time, the slide portion 7 moves along the concave groove 9 in the direction approaching the axis O, and the cutting blade insert 6 also moves in the same manner, and by this movement, finish cutting of the valve seat surface is performed.
In addition, what is necessary is just to reverse | retreat the tool main body 2 and to stop rotation after completion | finish of the finish cutting of a valve seat surface.

Further, when the reamer 5 is mounted on the tool body 2 in this cutting tool, the rear end portion of the reamer 5 is inserted into the nut member 25 and the collet 33 with the inner circumference of the collet 33 expanded. . Next, a work tool such as a hexagon wrench is engaged with the engagement hole 40 of the moving member 35 exposed from the conical surface of the tool body 2 and rotated. As a result, the nut member 25 moves along the axis O toward the chuck 30 side, and with this movement, the nut member 25 presses the chuck members 31 and 32 so that the inner diameter of the collet 33 is reduced. Transforms into Then, the rear end portion of the reamer 5 is tightened and gripped by the chuck 30 by this reduced diameter.
When the reamer 5 is removed from the tool body 2, the moving member 35 may be rotated in the direction opposite to that at the time of mounting.

Furthermore, when the reamer 5 having a different diameter is mounted on the tool body 2, the nut member 25 and the chuck 30 may be replaced. In this replacement, first, the sleeve 12 is moved to the rear end side of the tool body 2 until the projecting portion 12A comes into contact with the lid body 14, and then the projecting portion 12A passes through the communication groove 15C to the lower end side of the notch 14B. The sleeve 12 is rotated around the axis O so as to move. Thereafter, the sleeve 12 and the nut member 25 and the chuck 30 attached to the sleeve 12 are detached from the coupling portion 11 by moving the sleeve 12 along the axis O so that the protruding portion 12A passes through the notch 14B. Become. Then, the nut member 25 and the chuck 30 may be removed from the sleeve 12 and another nut member 25 and the chuck 30 may be attached to the sleeve 12.
Further, when the sleeve 12 is attached to the coupling portion 11, the sleeve 12 is moved along the axis O toward the distal end side of the coupling portion 11 so that the protruding portion 12 </ b> A passes through the notch 14 </ b> B. Then, the sleeve 12 may be rotated so that the protruding portion 12A moves in the communication groove 15C from the lower end side of the notch 14B to the upper end portion of the slit 15B.

  As described above, according to the cutting tool 1 according to the present embodiment, the reamer 5 can be advanced and retracted along the axis O, and the slide portion 7 can be moved by moving the same sleeve 12 along the axis O. Since the machine tool to which the cutting tool 1 is attached can be slid along the concave groove 9 of the main body 2, in addition to the drive shaft that rotates the tool main body 2, the drive shaft that moves the sleeve 12 forward and backward along the axis O is provided. What is necessary is just to have a main shaft structure provided with. That is, the spindle structure of the machine tool can be simplified and the rigidity can be easily secured.

Further, the coupling portion 11 that is not rotatable with respect to the tool body 2 is formed with a slit 15B that allows the sleeve 12 to advance and retreat, and at the same time restricts the rotation around the axis O, so that the reamer 5 The tool body 2 can be rotated integrally with the tool body 2 while being able to advance and retract along the axis O with respect to the tool body 2.
Further, the sleeve 12 and the reamer 5 can be easily attached to and detached from the coupling portion 11 by forming the notch 14B in the lid 14 of the coupling portion 11 and forming the communication groove 15C at the upper end portion of the slit 15B. That is, the reamer 5 can be easily replaced.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the configuration in which the valve seat surface obliquely intersecting with the axis O of the tool body 2 is finish cut is shown, but the surface orthogonal to the axis O may be finish cut. Further, the present invention can be applied not only to finish cutting but also to various cutting processes on a surface in a direction intersecting with the axis O.

In addition, although a pair of protrusions 12A is formed on the sleeve 12, for example, only one may be formed, or three or more may be formed. In this case, the number of slits 15B, communication grooves 15C, and cutouts 14B may be formed in correspondence with the number of protrusions 12A.
Furthermore, although the protrusion 12A is formed at the tip of the sleeve 12, it is sufficient that at least the stroke of the forward / backward movement of the sleeve 12 with respect to the coupling portion 11 is ensured, for example, in the direction of the axis O of the sleeve 12 You may form in a middle part.

It is a schematic sectional drawing which shows the cutting tool which concerns on one Embodiment of this invention. It is AA arrow sectional drawing of the cutting tool of FIG. It is BB arrow sectional drawing of the cutting tool of FIG. It is CC sectional view taken on the line of the cutting tool of FIG.

Explanation of symbols

1 Cutting tool 2 Tool body 5 Reamer (Hole drilling tool)
6 Cutting blade insert 7 Slide part 11 Coupling part 12 Sleeve 12A Protrusion part (locked part)
14 Lid (second locking part)
14B Notch 15A Inner peripheral surface 15B Slit 16 Bottom wall portion (first locking portion)
O axis

Claims (2)

A drilling tool is attached to the tip of a substantially conical tool body rotated about an axis so as to be able to advance and retreat along the axis, and a slide part having a cutting edge insert on the tip side is attached to the cone of the tool body. A cutting tool that is slidably mounted along the generatrix of the surface, and the hole machining tool and the slide portion are rotatable together with the tool body,
Inside the tool body, a substantially cylindrical coupling portion for inserting a rear end portion of the hole drilling tool is provided so as to advance and retreat along the axis.
The slide part is connected to the coupling part so as to slide in conjunction with the advancement and retreat of the coupling part,
Further inside the coupling body in the tool body, a sleeve for gripping the rear end portion of the drilling tool is inserted so as to be able to advance and retract along the axis,
At the tip of the coupling portion, an annular first locking portion that protrudes inward in the radial direction and that can be inserted only through the hole machining tool is formed,
At the rear end portion of the coupling portion, an annular second locking portion that protrudes inward in the radial direction and through which the sleeve can be inserted is formed,
The sleeve arranged on the inner side of the coupling portion protrudes radially outward from a part in the circumferential direction thereof and can be brought into contact with the first locking portion and the second locking portion. Part is formed ,
The inner peripheral surface of the coupling portion is formed with a slit that allows only the locked portion to be inserted into a part of the circumferential direction of the coupling portion so that the locked portion can slide along the axis. Cutting tool that features. On the inner peripheral edge of the second locking portion, a notch that allows the locked portion to be inserted along the axis is formed in a part of the circumferential direction thereof,
The notches are arranged at different positions in the circumferential direction with respect to the slit,
A communication groove that extends in the circumferential direction to the lower end side of the notch and that allows the locked portion to slide in the circumferential direction is formed between the slit and the notch at the upper end of the slit. The cutting tool according to claim 1 .

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