JP4962121B2 - Cutting tools - Google Patents

Description

  The present invention relates to a cutting tool that is optimal for use in, for example, drilling a valve hole in a cylinder head of an engine.

  Conventionally, in a valve hole of a cylinder head of an engine, a valve frequently hits the periphery of the opening of the hole. Therefore, a hard member such as a sintered alloy is fitted to this part to obtain durability. Yes. As a cutting tool for machining this valve hole, for example, as disclosed in Patent Document 1, a tool provided with a hole machining tool such as a gun reamer for finishing the hole itself and a cutting edge tip for machining the periphery of the opening. Are known. In this cutting tool, the cutting edge tip is provided so as to be slidable in a direction oblique to the rotation axis of the cutting tool so that the opening can be formed in a tapered surface shape according to the shape of the valve head. Yes.

3, 4, and 5 show an example of a conventional cutting tool used for machining such a valve hole. In these drawings, the tool body 1 has a substantially conical shape, is attached to a spindle end of a machine tool (not shown) via an adapter 2, is rotated around its axis O, and is subjected to cutting.
A bush 3 is attached to the tip of the tool body 1 along the axis O, and a shank of a drilling tool (not shown) such as the above-described gun reamer is fitted into the bush 3 so that the tool body 1 is The hole itself can be finished by advancing the hole machining tool while rotating. The advancement of the drilling tool is performed by a shaft 4 that is coaxially inserted into a slide shaft to be described later.

Three cutting edge tips 5A, 5B, and 5C are provided on the outer periphery of the tip of the tool body 1, and the peripheral edge of the opening of the valve hole is processed by these cutting edge tips 5A to 5C. . However, in FIG. 3, only one cutting edge tip 5A is shown, and the other two cutting edge tips 5B and 5C are not shown.
Here, of these cutting edge tips 5A to 5C, the two cutting edge tips 5B and 5C are directly fixed to the tool body 1, while one cutting edge tip 5A is slidably attached as described above. Yes. That is, the tool body 1 is formed with a T-groove 6 as shown in FIG. 4 obliquely to the axis O along the direction of the cone-shaped generatrix, and a slider 7 is formed in the T-groove 6. The blade tip 5A is slidably fitted and fixed to the slider 7 in a detachable manner.
An adjustment bolt 7A is screwed into the slider 7 in the radial direction, and the tip of the adjustment bolt 7A is positioned in contact with the rear end of the cutting edge tip 5A attached to the slider 7, The position of the cutting edge tip 5A in the direction of the axis O can be adjusted.

Further, holes 1a and 2a are formed along the axis O in the tool body 1 and the adapter 2, respectively, and a slide shaft 8 and a coupling member 9 are inserted into these holes 1a and 2a. . The coupling member 9 is fitted into the hole 1a via a key 9a, whereby the tool body 1 and the coupling member 9 can be rotated together around the axis O, and the slide shaft 8 is moved forward and backward. The inside of the hole 1a can be advanced and retracted.
Further, the T groove 6 and the hole 1 a of the tool body 1 are communicated with each other through a through hole 6 a that opens to the bottom surface of the T groove 6. A connecting pin (slide key) 10 that protrudes into the hole 1 a through the through hole 6 a is fixed to the slider 7 by a clamp screw 10 a, and the connecting pin 10 is formed on the coupling member 9. The slider 7 and the coupling member 9 are connected by being inserted into the inclined hole 9b.
By doing so, as the coupling member 9 is advanced and retracted via the slide shaft 8, the slider 7 slides along the T groove 6 and the cutting edge tip 5 </ b> A moves in a direction oblique to the axis O. It is like that.

In order to process a valve hole with the cutting tool having such a configuration, first, a hole processing tool such as a gun reamer is mounted on the bush 3 and pulled to the proximal end side of the tool body 1 by the shaft 4, and then the tool body By rotating 1 and feeding in the direction of the axis O, as shown in FIG. 5, the valve hole formed in the work material S using the two cutting edge tips 5B and 5C directly fixed to the tool Chamfer edges C and C.
Next, after the tool body 1 is slightly retracted once, the slide shaft 8 and the coupling member 9 are advanced while rotating the tool body 1, and the cutting edge tip 5 </ b> A is illustrated via the connecting pin 10 and the slider 7. By sliding along the middle chain line R direction, the tapered surface P is formed on the periphery of the opening of the valve hole. Thereafter, the machining of the inside of the valve hole (valve guide hole) is performed by advancing the hole machining tool with the shaft 4 while the tool body 1 is rotated.
JP-A-9-19811

  By the way, in the above-described conventional cutting tool, the T-slot 6 is formed obliquely to the axis O along the direction of the conical bus formed by the tool body 1, and the slider 7 slides in the T-slot 6. The blade tip 5A is movably inserted and fixed to the slider 7 in a detachable manner.

As described above, in the conventional cutting tool described above, the coupling member 9 is advanced and retracted through the slide shaft 8, whereby the connecting pin 10 slides in the oblique hole 9 b of the coupling member 9 and the slider 7 is inclined. Therefore, a large loss of driving force is required between the coupling member 9 and the slider 7, in other words, a larger amount of power is required to drive the slider 7 with the required power against the cutting resistance. Become.
Further, in the above-described conventional cutting tool, the slider 7 and the cutting edge tip 5A can also be slid at a predetermined taper angle along the taper surface P unless the T-groove 6 along the conical bus is accurately formed. Can not. Moreover, it is difficult to correct after the T-groove 6 is formed.
Further, the above-described conventional cutting tool requires many parts such as the slider 7, the connecting pin 10, and the clamp screw 10a. The necessity of such a large number of parts complicates the structure of the tool main body 1 and contributes to hindering the ease of assembly of the tool. As a result, tool manufacturing costs may be expensive.

  The present invention has been made under such a background, and is an optimum cutting tool for use in, for example, valve hole machining of a cylinder head of an engine, and reduces the driving force used, as well as machining efficiency and machining. An object of the present invention is to provide a cutting tool capable of improving accuracy, reducing the number of parts used, and improving the ease of assembly of the cutting tool.

The cutting tool according to the present invention employs the following means in order to solve the above problems.
The present invention has a tool body rotated about an axis, a hole machining tool extending along the axis is attached to a tip of the tool body, and a rear end portion of the tool body is a tool holding portion of a machine tool A cutting tool to be held, wherein the tool holding portion has an outer sleeve, an intermediate sleeve, and an inner sleeve arranged coaxially so as to be movable relative to each other in the axial direction. Is connected to the outer periphery of the rear end of the tool body, a hole machining tool is attached to the inner sleeve, and supported at the front end side of the intermediate sleeve so that it can advance and retreat only in the axial direction with respect to the tool body. The cutting blade member is connected, and the cutting blade member is positioned on the outer peripheral side of the hole machining tool at the tip of the tool body, and is inclined toward the rear end side as the cutting blade moves toward the outer peripheral side. Characterized by being placed in That.

  According to the present invention, the cutting blade of the cutting blade member connected to the intermediate sleeve is slid only along the direction of the same axis as the tool body connected to the outer sleeve while rotating the intermediate sleeve around the axis. Thus, a tapered inclined surface can be formed in the valve hole. For this reason, a taper surface-like inclination can be formed using a simpler structure than the conventional cutting tool.

Therefore, by performing the cutting while sliding the intermediate sleeve in the axial direction in this way, conventionally, the valve had to be cut while sliding the slider in the direction of the conical bus formed by the tool body. The chamfering of the tapered surface of the hole opening portion can be performed by sliding in the axial direction of one cutting blade member attached to the intermediate sleeve provided with the cutting blade member.
In addition, since the taper surface can be machined by directly moving the cutting blade member forward and backward by the movement of the intermediate sleeve, driving can be reduced. Moreover, the cutting blade member only needs to be advanced and retracted along the axial direction, and the taper angle can be adjusted by the cutting blade member, so that it is easy to ensure accuracy.

  In another cutting tool according to the present invention, in the above, a coupling member that is accommodated in the inner peripheral portion of the rear end of the tool main body so as to be movable back and forth only in the axial direction is connected to the distal end side of the intermediate sleeve. The cutting blade member is provided at a distal end of a slide block that is open to an outer peripheral side of the hole machining tool at a distal end of the tool body and is inserted into a long hole extending in the axial direction, and the slide block and the coupling member Are connected and fixed by a bolt member inserted into a sleeve member interposed between the slide block and the coupling member.

  According to the present invention, the coupling member connected to the intermediate sleeve and the slide block are fixed by the bolt member, so that the axial movement of the intermediate sleeve is directly transmitted to the slide block by the bolt member. A simple configuration capable of sliding the cutting blade in the direction of the axis is provided. Since a sleeve member into which the bolt member is inserted is interposed between the slide block and the coupling member, the slide block and the cup can be replaced by replacing the sleeve member with a different length. The distance from the intermediate sleeve to the cutting edge can be adjusted by adjusting the distance from the ring member.

  Another cutting tool according to the present invention is characterized in that, in the above, the slide block is supported by a tool body by being pressed from at least two directions that intersect the axis and intersect each other.

  According to the present invention, the slide block is supported in the tool body by being pressed and urged by the spring from two directions perpendicular to and perpendicular to the direction of the axis of sliding. Advances and retreats enable higher precision machining.

  According to the present invention, by arranging the cutting blade member so as to be movable back and forth in the axial direction, the cutting blade is configured to be slidable in the same axial direction as the tool main body. In the same way as the configuration in which the slider provided along the direction is slid in the direction of the bus, it is possible to improve the processing efficiency and processing accuracy of the valve hole and the like, and at the same time, the driving force is higher than the conventional configuration. Reduction and a significant reduction in the number of parts used can be achieved.

Hereinafter, an embodiment of a cutting tool according to the present invention will be described with reference to the drawings.
FIG. 1 is a side sectional view showing an embodiment of a cutting tool according to the present invention, and FIG. 2 is a front view of the embodiment shown in FIG.

  The cutting tool 11 includes a substantially conical tool body 12 that is rotated in a predetermined rotation direction (counterclockwise direction in FIG. 2) around an axis O during processing, and a tool tip side of the tool body 12 (left side in FIG. 1). ), A long reamer 13 as a hole machining tool extending along the axis O, and a cutting blade member 14 arranged toward the outer periphery of the tool main body 12 on the tool tip side. The reamer 13 has a substantially columnar shape, and a cutting edge portion 13A is formed at the tip side portion thereof, and the rear end side portion is a shank portion 13B.

As shown in FIG. 1, the tool body 12 is connected to the front end of a substantially cylindrical outer sleeve 21 of a spindle of a machine tool coaxially arranged on the rear end side thereof by a drive pin and an engagement hole (not shown). Thus, the rotation of the outer sleeve 21 is transmitted to the tool body 12. A substantially cylindrical intermediate sleeve 22 is coaxially disposed on the inner peripheral side of the outer sleeve 21, and a substantially cylindrical inner peripheral sleeve 23 is coaxially disposed on the inner peripheral side of the intermediate sleeve 22.
The tool body 12 has a multi-stage conical shape in which the outer diameter increases from the tool front end side to the rear end side (right side in FIG. 1), and a barrel portion 24 is formed at the center in the axis O direction. A surface 24A facing the tool rear end side of the portion 24 is a flat surface orthogonal to the axis O.

  A tip side portion of the inner peripheral hole of the tool body 12 is a small diameter hole 26, and a large diameter hole 27 having a one-step inner diameter is continuously provided on the tool rear end side of the small diameter hole 26. A bush 15 into which the shank portion 13B of the reamer 13 is inserted is fitted into the small diameter hole 26 on the inner peripheral side thereof. A coupling member 70 having a substantially cylindrical shape is inserted into the large-diameter hole 27 via the first key member 52, is slidable in the direction of the axis O, and can be rotated integrally with the tool body 12 around the axis O. It is said that.

The intermediate sleeve 22 is fitted and inserted so that the front end side thereof engages with the inner peripheral side of the coupling member 70 in the direction of the axis O. Specifically, the axis O is obtained by the engagement of the petal-shaped engagement protrusion 56 provided integrally with the tip of the intermediate sleeve 22 and the petal-shaped engagement recess 58 provided at the rear end of the coupling member 70. Connected in the direction.
An inner sleeve 23 is fitted on the inner circumference side of the intermediate sleeve 22 and can be connected to the shank portion 13B of the reamer 13. The coupling member 70 is advanced and retracted as the intermediate sleeve 22 advances and retracts. The reamer 13 is set to be fed by feeding the inner peripheral sleeve 23.

A long hole 30 extending along the direction of the axis O is formed at a position slightly away from the axis O on the tip side of the tool body 12 toward the outer periphery. The cross-sectional shape of the long hole 30 by a plane perpendicular to the direction of the axis O is a rectangular cross-section as shown in FIG. 2, and one side of the rectangle is formed so that a straight line extending in the radial direction from the axis O is orthogonal. Has been.
In the long hole 30, a substantially rectangular parallelepiped slide block 31 extending in parallel with the long hole 30 and a pair of flat side wall plates 80 and 81 are disposed.
The slide block 31 is inserted into the long hole 30 at the rear end side, and the cutting blade member 14 provided at the front end side portion protrudes toward the outer periphery on the front end side of the tool body 12. It can be slid along the axis O. The cutting blade member 14 is fixed to the slide block 31 by a clamp screw 16, and the cutting blade 14A is directed toward the rear end side toward the outer peripheral side of the tool body 12 in accordance with the inclination of the tapered surface to be formed. It is tilted.

  A screw hole is formed in the rear end side of the slide block 31 in parallel with the axis O, and the coupling member 70 is provided with a bolt insertion hole 34 so as to be coaxial with the screw hole. A cylindrical sleeve member 37 having an inner peripheral portion communicating with the screw hole and the bolt insertion hole 34 is interposed between the screw member 70 and the coupling member 70. A bolt 36 as a bolt member is inserted into the bolt insertion hole 34 and the inner peripheral portion of the sleeve member 37 from the coupling member 70 side and screwed into the screw hole. The side and the coupling member 70 are connected by the bolt 36 so as to sandwich the sleeve member 37 therebetween.

As shown in FIG. 2, one side wall plate 80 is in contact with the outer peripheral surface of the slide block 31 with respect to the axis O. The tool body 12 is provided with a large screw hole 72A having a large diameter in the radial direction, and the side wall plate 80 is provided with a small hole 72B having a small diameter in the radial direction. The front end portion of the first support bolt 74 wound with 82 is inserted, and the large-diameter head portion in which the thread of the first support bolt 74 is formed is screwed into the large screw hole 72A. Is urged toward the inner peripheral side with respect to the axis O. Accordingly, the slide block 31 is also pressed and supported by the side wall plate 80 toward the radially inner peripheral side.
As shown in FIG. 2, the other side wall plate 81 is in contact with the side surface of the slide block 31 that faces the rotation direction of the tool body 12 during processing. Large screw holes 73A having large diameters in the direction perpendicular to the axis O and perpendicular to the direction in which the first support bolt 74 is screwed are provided at two locations apart from each other in the direction of the axis O of the tool body 12. Are provided with a small-diameter small hole 73B. The small hole 73B is inserted with a tip end portion of a second support bolt 75 in which a coil spring 83 is wound around a small-diameter body portion, thereby providing a large screw hole. Since the head of the second support bolt 75 is screwed into 73A, the side wall plate 81 is pressed and urged rearward in the rotational direction (clockwise direction in FIG. 2). 81 is pressed and supported on the rear side in the rotational direction.
As described above, the slide block 31 has two directions that intersect with the sliding axis O and also intersect with each other by the coil springs 82 and 83 of the pair of side wall plates 80 and 81 (this embodiment). In this case, the tool body 12 is supported so as to be slidable in the direction of the axis O in the long hole 30 of the tool body 12.

A nut member 38 having gear teeth 39 formed on its outer peripheral surface is accommodated on the tool front end side of the inner peripheral hole of the intermediate sleeve 22, and the inner peripheral sleeve 23 is inserted on the tool rear end side of the nut member 38. Yes.
The inner peripheral hole formed in the inner peripheral sleeve 23 includes a first hole 40 that opens toward the distal end surface, a second hole 41 that is one step smaller in diameter than the first hole 40, and the second hole 41. Further, the third hole 42 having a one-step small diameter is continuously provided. A tool rear end side portion of the nut member 38 is fitted into the first hole 40.

A chuck 43 for supporting the reamer 13 is inserted into the second hole 41. The chuck 43 includes a pair of chuck members 44 and 45 arranged so as to be vertically arranged in the direction of the axis O, and a collet 46 arranged inside the chuck members 44 and 45 in the radial direction.
The chuck members 44 and 45 are formed in a substantially cylindrical shape having an outer diameter that can be inserted into the second hole 41, and the chuck member 44 arranged on the tool front end side faces the tool rear end side of the nut member 38. The chuck member 45 that is brought into contact with the surface and is arranged on the rear end side of the tool is brought into contact with the bottom surface of the second hole 41 facing the tool front end side, and an axis line is provided between the pair of chuck members 44 and 45. They are arranged at intervals in the O direction. Further, taper portions 44A and 45A that gradually increase in diameter toward the other chuck member 45 and 44 are formed on the inner peripheral sides of these chuck members 44 and 45, respectively.

  The collet 46 has a substantially cylindrical shape whose outer peripheral side is in close contact with the tapered portions 44 </ b> A and 45 </ b> A, and a plurality of slits along a plane including the central axis of the collet 46 are formed in the cylindrical wall portion. (Not shown) is formed, and the inner diameter of the collet 46 is reduced by bending a portion sandwiched between the slits radially inward with respect to the central axis. The shank portion 13 </ b> B of the reamer 13 is inserted on the inner peripheral side of the collet 46.

A moving member 47 that moves the nut member 38 disposed on the tool front end side of the chuck 43 so as to advance and retract in the direction of the axis O is disposed on the tool front end portion of the intermediate sleeve 22.
The moving member 47 has a cylindrical shape extending in parallel with the axis O, and a worm gear portion 49 having a disk shape and having worm teeth 48 on the outer periphery is formed on the tool rear end side of the moving member 47. Yes. The worm teeth 48 are meshed with gear teeth 39 formed on the outer peripheral surface of the nut member 38 on the tool tip side, and the nut member 38 can be moved in the axis O direction by rotating the moving member 47. . An engagement hole 50 that engages with a work tool such as a hexagon wrench is formed on the tool tip side of the moving member 47, and the engagement hole 50 is exposed on the tip surface of the tool body 12.

  A key groove 51 extending in parallel with the axis O is formed in the tool rear end portion of the large diameter hole 27 of the tool body 12, and is fitted into the key groove 51 in the rear end portion of the outer peripheral surface of the coupling member 70. The key member 52 is provided, and the key groove 51 and the key member 52 are engaged to prevent relative rotation between the tool body 12 and the coupling member 70.

  The intermediate sleeve 22 is provided with a set screw 55 that presses the inner sleeve 23 so that the intermediate sleeve 22 and the inner sleeve 23 do not easily move relative to each other in the direction of the axis O. Further, the intermediate sleeve 22 and the coupling member 70 are, as described above, the petal-shaped engagement protrusion 56 provided integrally with the front end portion of the intermediate sleeve 22 and the petal shape provided at the rear end portion of the coupling member 70. It is connected in the direction of the axis O by engagement with the engagement recess 58. Thus, the intermediate sleeve 22 and the coupling member 70 are prevented from easily moving relative to each other in the direction of the axis O.

An attachment portion 61 that is attached to the tool holding portion 62 of the machine tool is formed on the tool rear end side of the tool body 12.
As shown in FIG. 2, a guide groove 57 having an arc shape is formed on the surface 24 </ b> A facing the tool rear end side of the body portion 24 of the outer sleeve 21. The guide groove 57 is engaged with a guide pin 77 disposed in a portion of the machine tool facing the surface 24A facing the tool rear end side of the body portion 24 of the outer sleeve 21. 12 is configured to rotate relative to the guide groove 57.

  As shown in FIG. 2, two fixed cutting blades 20 are provided on the outer periphery on the distal end side of the tool body 12 with phases different from each other in the circumferential direction. Each of the fixed cutting blades 20 is fixed to the outer periphery on the front end side of the tool body 12 by adjusting the cutting edge positions in the radial direction and the axis O direction so as to be shifted from each other.

The operation of the above configuration will be described.
When the reamer 13 is mounted on the tool body 12, the shank portion 13B of the reamer 13 is inserted into the bush 15, the nut member 38, and the collet 46 with the inner circumference of the collet 46 expanded, and the outer sleeve. By engaging and rotating a working tool such as a hexagon wrench in the engagement hole 50 of the moving member 47 exposed on the tip surface side of the nut 21, the nut member 38 is moved to the tool rear end side.
Then, the surface of the nut member 38 facing the tool rear end side presses the chuck members 44 and 45, and the collet 46 is deformed so that the inner diameter thereof is reduced, thereby supporting the shank portion 13 </ b> B of the reamer 13. Become.

  When the preparation is completed and the tool body 12 is rotated around the axis O in the rotation direction, the blade edge portion 13A of the reamer 13 cuts the valve hole, and the fixed cutting blade 20 chamfers the edge portion. Further, the tool body 12 is slightly retracted while rotating around the axis O, and then the intermediate sleeve 22 is moved to the tip side in the direction of the axis O, whereby the coupling member 70 advances, and the bolt 36 and the sleeve member 37 are moved. The slide block 31 moves forward while sliding in the direction of the axis O, and the cutting edge 14A of the cutting edge member 14 attached to the tip of the slide block 31 cuts the tapered surface.

  As described above, in the present embodiment, the inner sleeve 23 supports the reamer 13 as a drilling tool, and the intermediate sleeve 22 is connected to the slide block 31 that can slide only in the direction of the axis O. Since the cutting edge 14A of the cutting edge member 14 attached to the slide block 31 is inclined toward the rear end side toward the outer peripheral side of the tool body 12 at a taper angle corresponding to the tapered surface to be formed. When performing the cutting process as described above, the intermediate sleeve 22 is moved in the direction of the axis O, and the slide block 31 and the cutting blade member 14 mounted on the slide block 31 are moved only in the direction of the axis O. The periphery of the opening of the valve hole can be processed into a taper shape.

  For this reason, it is possible to perform such a taper-shaped processing while having a relatively simple configuration, and to reduce the number of required parts, and the tool body 12 has a long hole parallel to the axis O. The tool main body 12 may be configured to guide the cutting blade member 14 by forming the T 30 groove as compared with the conventional case where the T groove is formed along the conical generatrix formed by the tool main body. It is easy to process and manufacture. Further, since the cutting blade member 14 provided with the cutting blade 14A can be driven forward and backward by the movement of the intermediate sleeve 22 to process the tapered surface, the loss of the driving force is small, and therefore the driving force is reduced. You can also plan.

  Furthermore, in this embodiment, the advance / retreat of the cutting blade member 14 that cuts the tapered surface can be controlled independently of the feed of the tool body 12 in the direction of the axis O, and accordingly, the cutting blade 14A can be controlled. The feed can be adjusted according to cutting conditions and the like. For example, by making the feed of the cutting blade 14A smaller than the feed of the reamer 13 or the fixed cutting blade 20, the tapered surface can be processed with higher accuracy. Moreover, since the inclination of the cutting blade 14A can be adjusted for each cutting blade member 14, the accuracy of the taper angle itself can be ensured.

  In the present embodiment, a coupling member 70 that can be advanced and retracted only in the direction of the axis O is connected to the distal end side of the intermediate sleeve 22, and the cutting blade member 14 is a slide inserted into the elongated hole 30. Since the coupling member 70 and the slide block 31 are connected to each other by the bolt 36 via the sleeve member 37, the movement of the intermediate sleeve 22 in the direction of the axis O can be performed using the coupling member 70. It can be directly transmitted as the advance / retreat of the cutting blade 14A. For this reason, it is possible to prevent a situation in which the cutting edge 14 </ b> A is displaced from a direction parallel to the axis O and advances and retracts, and further accurate machining can be promoted.

  In addition, a sleeve member 37 is interposed between the slide block 31 and the coupling member 70, and the bolt 36 is inserted into the inner peripheral portion of the sleeve member 37. The distance between the slide block 31 and the coupling member 70 in the direction of the axis O can be adjusted by changing to a different one, and accordingly the distance from the cutting edge 14A at the tip of the slide block 31 to the intermediate sleeve 22 can be adjusted. Can do. For this reason, the cutting edge 14A can be arranged at an optimal position in the direction of the axis O with respect to the tapered surface to be machined, and machining with higher accuracy is possible.

  Moreover, the slide block 31 is also pressed and urged by the pair of side wall plates 80 and 81 from the two directions intersecting the axis O in the long hole 30 and also intersecting each other. Therefore, the slide block 31 can be guided along the long hole 30 without fail, and processing with higher accuracy can be achieved. Further, since the slide block 31 is pressed and biased in this way, there is also an advantage that it is possible to prevent rattling even when the side surface of the slide block 31 is worn due to long-term use, for example.

  Note that the shapes, combinations, operation procedures, and the like of the constituent members shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

It is a sectional side view which shows one Embodiment of the cutting tool of this invention. It is a front view of embodiment shown in FIG. It is a sectional side view which shows the conventional cutting tool. It is ZZ sectional drawing in FIG. It is a figure which shows the locus | trajectory of rotation and sliding of the cutting-blade tip 5A-5C in the conventional cutting method.

Explanation of symbols

11 ... Cutting tool 12 ... Tool body 13 ... Reamer (drilling tool)
14 ... Cutting blade member 21 ... Outer sleeve 22 ... Intermediate sleeve 23 ... Inner sleeve 31 ... Slide block 36 ... Bolt (bolt member)
37 ... Sleeve member 62 ... Tool holder 70 ... Coupling member O ... Rotation axis of the tool body 12

Claims (3)

Cutting having a tool body rotated around an axis, a drilling tool extending along the axis being attached to a tip of the tool body, and a rear end portion of the tool body being held by a tool holding portion of a machine tool A tool,
The tool holding portion has an outer sleeve, an intermediate sleeve, and an inner sleeve arranged coaxially so as to be movable in the axial direction.
A rear end outer peripheral part of the tool body is connected to a front end side of the outer peripheral sleeve,
The hole machining tool is attached to the inner sleeve,
A cutting blade member supported so as to be movable back and forth only in the axial direction with respect to the tool main body is connected to the distal end side of the intermediate sleeve,
The cutting blade member is located at the outer peripheral side of the hole machining tool at the tip of the tool main body, and is arranged so that the cutting blade is inclined toward the rear end side toward the outer peripheral side. Cutting tools. A coupling member that is accommodated in the inner peripheral portion of the rear end of the tool body so as to be able to advance and retreat only in the axial direction is connected to the front end side of the intermediate sleeve.
The cutting blade member is provided at the tip of a slide block that is inserted into an elongated hole that opens in the outer peripheral side of the hole machining tool at the tip of the tool body and extends in the axial direction.
2. The slide block and the coupling member are connected and fixed by a bolt member inserted through a sleeve member interposed between the slide block and the coupling member. The described cutting tool.   3. The cutting tool according to claim 2, wherein the slide block is supported by the tool body by being pressed from at least two directions that intersect the axis and intersect each other.

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