JP2002254219A - Cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting tool which enables the insertion of a connecting pin 19 to a connecting hole 14 for connection in a simplified way without fail, and to miniaturize the diameter of a valve hole and it's opening. SOLUTION: On a recessed groove 5 formed on a generating line of a tool body 1 of a near-frustum outer shape which is rotated around an axis line O, a slider 6 equipped with a cutting blade chip 4 is attached slidably along the generating line. A drive member 3 is attached to a mounting hole 1a which is formed inside the tool body 1, integrally rotatable with the tool body 1 and retractably movable in the direction of the axis line O, and on the slider 6, a connection hole 14 opened facing a connecting hole 5d, which passes through the recessed groove 5 and the mounting hole 1a, is formed, meanwhile, the connecting pin 19, which is projected from the connecting hole 5d to the recessed groove 5 and inserted in and out adjustably in the connecting hole 14, is provided. The connecting pin 19 is inserted into the connecting hole 14 in a state of being fixable in the direction of the generating line and slidable around the periphery of the tool body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool particularly suitable for machining a valve hole in a cylinder head of an engine.

[0002]

2. Description of the Related Art As a cutting tool of this kind, the inventors of the present invention have disclosed, for example, Japanese Patent No. 2779112 and Japanese Patent No. 280.
No. 4696, etc., a hole machining tool such as a gun reamer is provided at the tip of a substantially conical tool body rotated about an axis so as to be able to protrude and retract along the axis, and the vicinity of the hole machining tool at the tip of the tool body. A cutting edge tip is attached to each of the inner peripheral side and the outer peripheral side, and the cutting edge tip is also provided at a concave groove formed along the generatrix direction of the cone formed by the tool main body on the outer periphery of the tool main body. It has been proposed that a slider provided is mounted so as to be slidable in the generatrix direction. Here, a coupling is attached to a mounting hole formed inside the tool main body via a key extending parallel to the axis so as to be integrally rotatable with the tool main body and advance / retreat in the axial direction. A coupling hole is formed in the coupling in a direction orthogonal to the generatrix and crossing the axis. On the bottom surface of the groove, the coupling hole is opened to allow the attachment hole to communicate with the groove. A communication hole is formed.

[0003] Further, a connection pin, which protrudes into the mounting hole from the communication hole on the bottom surface of the concave groove and is inserted into the connection hole of the coupling so as to be freely retractable, is attached to the slider by a mounting screw or the like. By moving the coupling in the axial direction by a chuck spindle or the like, the connecting pin slides the slider along the concave groove in the generatrix direction while protruding and retracting from the connecting hole. Is also moved parallel to this generatrix. Therefore, according to the cutting tool having such a configuration, while the inner periphery of the valve hole is machined by the hole machining tool, the rotation trajectory that the movement path of the cutting edge tip of the slider makes around the axis is a tool. By setting so as to connect between the rotation trajectories of the cutting edge tips on the inner and outer circumferences of the front end of the main body, the processing of the periphery of the opening of the valve hole by these cutting edge tips is exactly coaxial with the processing of the valve hole. Can be performed.

[0004]

By the way, in the cutting tool having such a structure, the slider attached to the concave groove on the outer periphery of the tool main body is connected to the connecting pin by the reciprocation of the coupling attached to the mounting hole inside the tool main body. In order to be able to slide reliably in the direction of the generatrix through the above, it is necessary to manufacture each of these tool bodies, sliders, couplings, and connecting pins with high molding precision, respectively. It is inevitable that a certain amount of molding error and variation in accuracy will occur when manufacturing. However, in this regard, in the above-mentioned conventional cutting tool, an adjusting member is inserted between the concave groove of the tool body and the slider together with a wedge member and a spacer, and both the slider and the connecting pin are provided between the slider and the connecting pin. It is proposed to provide a fine adjustment mechanism for finely adjusting the position in the generatrix direction.

[0005] However, the connecting pin and the coupling are formed by simply inserting and connecting the columnar connecting pin to the connecting hole which is a circular hole having a circular cross section formed in the conventional coupling. Therefore, even if the position of the connection pin and the connection hole in the generatrix direction can be adjusted by the fine adjustment mechanism, the connection error between the connection pin and the connection hole in the circumferential direction of the tool main body due to the molding error and variation in accuracy. If the position shifts, the coupling pin cannot be inserted into the coupling hole to connect the coupling and the slider. On the other hand, in addition to the fine adjustment mechanism for the position in the generatrix direction, an adjustment mechanism for finely adjusting the position in the circumferential direction is provided for the slider of a limited size attached to the concave groove formed in the tool body. It is extremely difficult to provide, and even if such an adjustment mechanism can be provided, it is inevitable that the adjustment work in these two directions becomes extremely complicated.

Further, due to the recent trend toward downsizing of cylinder heads with downsizing of engines and increasing the number of valves for small displacement engines, the diameters of valve holes to be machined and the openings thereof have been reduced. Accordingly, cutting tools such as those described above are required to have a smaller outer diameter, that is, a smaller size. However, a fine adjustment mechanism for forming a connection hole in the coupling, providing a connection pin to be inserted into the connection hole on the slider, and adjusting the position of the connection pin on the slider in the generatrix direction,
In addition, if an attempt is made to provide an adjusting mechanism for adjusting the position in the circumferential direction, it is inevitable that the outer dimensions of the slider will become larger, and the tool body itself will also become larger with this. It becomes extremely difficult.

[0007] The present invention has been made in view of such circumstances, and in a cutting tool having the above-described configuration, a simple means is provided without providing such a mechanism for adjusting the circumferential direction of the tool body. In addition, it is possible to provide a cutting tool that can reliably connect the connecting pin by inserting the connecting pin into the connecting hole, and also can prevent the slider from being enlarged, and can cope with reducing the diameter of the valve hole and its opening. It is an object.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve such an object, the present invention is directed to forming a tool body along a generating line of a tool body having a substantially truncated conical shape which is rotated around an axis. A slider having a cutting edge tip is slidably mounted in the generatrix direction in the recessed groove, and a mounting hole formed in the tool body is rotatable integrally with the tool body and in the axial direction. A driving member is attached to the slider so as to be able to advance and retreat, and a connection hole is formed in the slider so as to face a communication hole communicating the concave groove and the mounting hole. A connecting pin is provided which protrudes into the hole and is inserted into the connecting hole so as to be freely retractable. The connecting pin can be engaged with the connecting hole in the generatrix direction and slidable in the circumferential direction of the tool body. Characterized in that it is inserted into

Therefore, in the cutting tool having the above-described structure, the connecting hole is formed on the slider side, and the connecting pin slides the slider in the generatrix direction to drive the slider forward and backward. The cutting tool is provided with a coupling), that is, there is no need to provide a connecting pin and a mechanism for finely adjusting the position of the connecting pin on a slider mounted in a groove of a limited size of the tool body. It is possible to promote downsizing of the tool body itself by reducing the size of the slider. Further, the connection pin provided on the driving member is only for sliding the slider in the generatrix direction by being inserted into the connection hole of the slider, and the position of the slider itself in the circumferential direction is the same as that of the first embodiment. Since the slider is mounted in the groove, it is positioned at a predetermined position by the inner wall of the groove, the wedge member, the spacer, and the like, so that the connection pin and the driving member are engaged only in the generatrix direction. It does not have to be engaged in the circumferential direction of the tool body. Therefore, if the connecting pin is slidable in the circumferential direction with respect to the connecting hole, even if the connecting pin, the spacer, and the driving member have a molding error or the like, the connecting pin or the connecting hole may be in the circumferential direction. Even if it is deviated from the predetermined position, the connection pin can be inserted into the connection hole at this deviated position (however, it is fitted only in the direction of the above-mentioned generatrix). Since there is no hindrance to the engagement between the pin and the driving member in the generatrix direction, the slider can be reliably slid by the advancing and retreating of the driving member via the connecting pin.

Here, in order to insert the connecting pin into the connecting hole so as to be slidable in the circumferential direction of the tool main body and in the circumferential direction of the tool body, the connecting hole is connected to the bus bar. It is desirable to form a long hole extending in the circumferential direction of the tool body with a width in which the connection pin can be inserted in the direction. However, even though the connecting pin is slidable in the circumferential direction of the tool body with respect to the connecting hole, this is because the connecting pin is fitted in the bus direction in the circumferential direction. In the assembled cutting tool, even if the slider is slid by moving the driving member forward and backward, the connecting pin is not moved when the connecting pin moves in and out of the connecting hole. It only slides in the direction of the center axis of the connecting pin, and does not move in the connecting hole in the circumferential direction of the tool body. Further, in order to more reliably engage the connection pin and the connection hole in the bus direction, the connection hole includes a pair of mutually parallel wall surfaces facing in the bus direction, and the connection pin includes It is desirable to form a pair of parallel side surfaces that can slide on these wall surfaces. Further, in the cutting tool provided with the connecting pin on the driving member as described above, a fine adjustment mechanism for finely adjusting the position of the connecting pin in the generatrix direction is also provided on the driving member side. The size is originally larger than the slider, so that even if the fine adjustment mechanism is provided, the miniaturization of the tool main body is not hindered.

[0011]

FIG. 1 to FIG. 6 show an embodiment of the present invention. In this embodiment, the tool main body 1 has a substantially multi-stepped truncated cone shape whose diameter gradually decreases as it goes toward the front end side (the left side in FIGS. 1 and 5), and the rear end of the main spindle of a machine tool not shown. And rotated about its axis O in the tool rotation direction T shown in FIG. A bush 2 is attached to the tip of the tool main body 1 along the axis O. The shank of the hole machining tool G such as a gun reamer described above is inserted into the bush 2 and the tool main body 1 is rotated. By advancing the drilling tool G while doing so, it is possible to finish the inner circumference of the valve hole as described above. Further, an axis O extends from the rear end inside the tool body 1.
A mounting hole 1a having a substantially circular cross section is formed along
5 and 6, which are inserted through the inside of the main shaft of the machine tool in place of the conventional coupling, in the mounting hole 1a.
1 is inserted as it is, and in this embodiment, the chuck spindle 3 is a driving member.

On the outer periphery of the tip of the tool body 1, three cutting blade tips 4 for machining the periphery of the opening of the valve hole are provided.
, Two of which are directly attached to the tool body 1, while the other one is along the direction of the generatrix of the cone formed by the tool body 1. The slider 6 is attached to the tip of a slider 6 slidably attached to a concave groove 5 formed on the outer periphery of the main body 1. Here, as shown in FIG. 3, the concave groove 5 has a pair of opposing wall surfaces 5a and 5b, and these wall surfaces 5a and 5b.
b has a U-shaped section defined by a bottom surface 5c orthogonal to b and opening to the outer peripheral side.
The spacer 7 is interposed between the slider 6 and the spacer 7 on the wall surface 5a facing the tool rotation direction T, and the plate 8 is interposed on the wall surface 5b facing the rear side in the tool rotation direction T. A communication hole 5d for communicating the groove 5 with the mounting hole 1a of the tool body 1 is formed on the bottom surface 5c of the groove 5 so as to extend in the generatrix direction.
A keyway 1b is formed on the inner periphery of the mounting hole 1a of the tool body 1 so as to extend in parallel with the axis O along a plane P including the generatrix and the axis O. The hole 5d is provided at the tip of the key groove 1b.
a.

The spacer 7 is a plate-shaped member formed so as to extend over substantially the entire length of the concave groove 5 when mounted on the tool body 1.
As shown in FIG. 3, the inside of the concave groove 5, that is, the side surface facing the tool rotation direction T side, is detachably attached by a pair of clamp screws 9, 9 so as to be in close contact with the bottom surface 5 a and the bottom surface 5 c. A serration groove 7a having a wavy cross section extending along the generatrix direction is formed. On the other hand, the plate 8 is also a plate-shaped member formed so as to extend over substantially the entire length of the concave groove 5, and is detachable so as to be sandwiched between the wall surface 5 b of the concave groove 5 and the slider 6. A through hole 8a is formed from a side surface facing the wall surface 5b.

As shown in FIG. 1, the slider 6 is a prism-shaped member which is bent in a "U" shape. The slider 6 has a base end disposed in the groove 5 and a tip end formed at the tip. The cutting tip 4 is detachably mounted. At the base end of the slider 6, as shown in FIG. 3, a spacer 7 is attached to the wall surface 5 a side, that is, one of the side surfaces facing the rear side in the tool rotation direction T when mounted on the tool body 1. A serration groove 6a having a corrugated cross section is formed in close contact with the serration groove 7a.
The serration groove 6a is aligned with and engaged with the serration groove 7a of the spacer 7, and the other side surface 6b of the base end facing the tool rotation direction T is brought into close contact with the plate 8, and the lower surface 6c is further formed into a concave groove. 5 is attached to the groove 5 so as to be slidable along the generatrix direction in close contact with the bottom surface 5c.

Further, on the wall surface 5b side of the concave groove 5, a plurality of mounting holes 5e penetrating perpendicularly to the wall surface 5b toward the outer peripheral surface of the tool body 1 are formed in the generatrix direction. The penetrating portion of the hole 5e on the wall surface 5b side has a smaller diameter by one step, and a female screw portion is formed on the inner periphery of the opening on the outer peripheral surface side, and a bush 10 is provided between the penetrating portion and the female screw portion. Is inserted. Further, each of these mounting holes 5e has a set screw 11 having a head in which a male screw portion screwed to the female screw portion is formed and a shaft portion which can be inserted into the through hole 8a of the plate 8. Are attached, and around the shaft portion of each set screw 11, a disc spring 12 ...
Are projected from the through portion to the wall surface 5b and are brought into contact with the plate 8. The disc springs 12 move the slider 6 through the plate 8 to the spacer 7 in accordance with the screwing amount of the set screw 11. , The serration grooves 6a, 7a of the two are firmly engaged.

At the base end of the slider 6,
It stops perpendicularly to its lower surface 6c, that is, perpendicular to the bottom surface 5c of the concave groove 5 with the slider 6 attached, so as to head toward the outer peripheral side of the tool body 1 along the plane P and toward the tip end. A hole-shaped connection hole 14 is formed, and this connection hole 14 is formed in a long hole shape extending in the circumferential direction of the tool body 1 as shown in FIG. In the state of attachment to the device, it is formed so as to extend in a direction perpendicular to the plane P (a direction perpendicular to the drawing of FIG. 1; in FIG. 4, a vertical direction). Accordingly, in the present embodiment, the pair of wall surfaces 14a, 14a facing each other in the generatrix direction of the connection hole 14 are also disposed perpendicularly to the generatrix direction, and extend in the circumferential direction along the direction orthogonal to the plane P. And the width of the wall surfaces 14a, 14a in the extending direction is made larger than the distance between the wall surfaces 14a, 14a in the generatrix direction. At both ends of the connecting hole 14 in the extending direction, escape portions 14b, 14b are formed in which the ends of the wall surfaces 14a, 14a are cut out in a concave arc shape in cross section so that the interval is slightly widened. Have been.

On the other hand, the chuck spindle 3 whose tip is inserted into the mounting hole 1a of the tool body 1 further includes
The substantially cylindrical inner sleeve 16 is also coaxially fitted to the inner periphery of the substantially cylindrical outer sleeve 15 with respect to the axis O. The inner periphery of the outer sleeve 15 includes the axis O as described above. A pair of key grooves 15a, 15a are formed so as to extend parallel to the axis O so as to extend along a plane orthogonal to the plane P, and fit on the outer circumference of the inner sleeve 16 with these key grooves 15a, 15a. Keys 16a, 16a are attached, so that the outer sleeve 15 and the inner sleeve 16 can rotate integrally about the axis O and can advance and retreat independently of each other in the direction of the axis O. Further, a chuck mechanism 17 is provided on the inner peripheral portion on the distal end side of the inner sleeve 16 to grip and mount the shank of the hole machining tool G inserted into the bush 2 at the distal end of the tool body 1. Further, the distal end of the outer sleeve 15 has an outer diameter capable of being fitted into the mounting hole 1a of the tool body 1, and the outer peripheral portion of the distal end has the key groove formed on the inner periphery of the mounting hole 1a. A key 18 that can be fitted is attached to 1b, so that the outer sleeve 15 and the tool main body 1 can also rotate integrally about the axis O and advance and retreat independently of each other in the direction of the axis O.

In this embodiment, the key 18
Is fitted in the key groove 1b and the tip of the chuck spindle 3 is inserted into the mounting hole 1a.
A connecting pin 19 is integrally formed at the tip of the key 18 so as to protrude vertically from the bottom surface 5c of the concave groove 5 to the bottom surface 5c of the concave groove 5 through the communication hole 5d. The tip of the connecting pin 19 protruding into the groove 5
The slider 6 can be fitted and inserted into the connection hole 14 of the slider 6 attached thereto. That is, the tip of the connecting pin 19 has a rectangular cross section along the generatrix direction (square in this embodiment in particular), and the width between the pair of side faces 19a, 19a of the tip which faces the generatrix direction. Is large enough to fit between the wall surfaces 14a, 14a of the connecting holes 14 of the slider 6, and the width of this tip in the direction orthogonal to the plane P, that is, the circumferential width of the tool body 1 is The width of the connecting hole 14, which is formed into a long hole extending in the circumferential direction, is made smaller. Therefore, such a connecting pin 19
Is inserted into the connection hole 14 so that the slider 6
As the chuck spindle 3 advances and retreats in the direction of the axis O, the side faces 19a, 19a
One of the wall surfaces 14a, 14a facing this
, And can be engaged with the connecting hole 14 in the generatrix direction, and the circumferential direction of the tool body 1, that is, the plane P
Since the width of the connection hole 14 is larger than the width of the distal end of the connection pin 19 in the direction orthogonal to
9a is slidable while closely contacting the wall surfaces 14a.

In this embodiment, the connecting pins 19
The key 18 formed at the tip of the key 18 is attached to the tip of the outer sleeve 15 of the chuck spindle 3 so as to be able to advance and retreat in a small range in the direction of the axis O and to be fixed at a predetermined advance and retreat position. The position of the connection pin 19 in the generatrix direction can also be finely adjusted in accordance with the advance / retreat range, and a fine adjustment mechanism 20 for the connection pin 19 is configured. That is, the fine adjustment mechanism 20 in the present embodiment is
In the outer sleeve 15, a key groove 15b extending parallel to the axis O along the plane P is formed at a position on the outer periphery of the distal end of the outer sleeve 15 where the key 18 is attached, and the base end of the key 18 is fitted. A pair of clamp screw holes 15c, 15c is formed in the groove 15b in the
The base end portion has a slot-like insertion hole 18 slightly extending in the axis O direction at a position substantially corresponding to the clamp screw holes 15c, 15c along the axis O direction.
a, 18a are penetrated. And these insertion holes 1
The clamp screws 21 and 21 are inserted through the clamp screws 8a and 18a and loosely screwed into the clamp screw holes 15c and 15c, and the position of the key 18 in the direction of the axis O is elongated.
The key 18 and the connecting pin 19 are positioned at predetermined positions in the direction of the axis O by making fine adjustments in the range of a and 18a, and then tightening these clamp screws 21 and 21 strongly. By driving the pin 22 over the sleeve 15, the key 18 and the connecting pin 19 are firmly fixed to the outer sleeve 15.

In the cutting tool thus configured, the tool body 1, chuck spindle 3, and hole machining tool G are rotated together with the spindle of the machine tool around the axis O in the tool rotation direction T.
And the two cutting edge tips 4 and 4 directly fixed to the tip of the tool body 1 to machine the tapered surfaces on the back side and the opening edge side of the opening of the valve hole, while continuing to rotate. By moving the outer sleeve 15 of the chuck spindle 3 in the direction of the axis O, the slider 6 is moved in the generatrix direction along the concave groove 5 via the connecting pin 19, and the cutting blade attached to the tip of the slider 6 is moved. The tip 4 forms a tapered surface between the tapered surface on the hole inner side and the tapered surface on the opening edge side in parallel with the generatrix direction, and further advances the inner sleeve 16 of the chuck spindle 3 while continuing rotation. By projecting the hole drilling tool G, the inner circumference of the valve is finished to a predetermined diameter. Therefore, since these processings are performed while the tool body 1 is rotated around the axis O, the inner diameter of the valve hole and the three tapered surfaces of the opening can be formed with high coaxiality.

Further, in the cutting tool having the above configuration,
When the connecting pin 19 of the chuck spindle 3 is inserted into the connecting hole 14 formed in the slider 6, the tip of the connecting pin 19 and the connecting hole are formed due to a molding error of the slider 6 or a forming error of the connecting pin 19. Even if there is a shift in the circumferential direction of the tool main body 1 at the position where the tool body 1 is inserted into the fitting hole 14, the wall surfaces 14 a, 14 a of the connection hole 14 and the side surfaces 19 a, 19 a of the tip of the connection pin 19 are not moved. As long as the parallelism is ensured, the connecting pin 19 is slidable in the circumferential direction of the tool body 1 with respect to the connecting hole 14 as described above. 19a,
19a is brought into close contact with the wall surfaces 14a, 14a,
Can be inserted into the connection hole 14, and the chuck spindle 3 and the slider 6 are connected via the connection pin 19, so that the slider 6 can be surely moved as the chuck spindle 3 advances and retreats.
Can be slid in the generatrix direction. Therefore, according to such a cutting tool, the chuck spindle 3 and the slider 6 cannot be connected due to molding errors or the like without providing a mechanism for adjusting the position of the connecting pin 19 in the circumferential direction on the chuck spindle 3. Such problems can be prevented from occurring, and the structure of these components can be simplified, and the manufacturing thereof does not require an unnecessarily high molding accuracy.

Further, in the above cutting tool, the connecting pin 19 is mounted not on the slider 6 side but on the chuck spindle 3 as a driving member.
Is provided only with a connection hole 14. Therefore, it is not necessary to provide a mounting seat or mounting screw for mounting the connecting pin 19 to the slider 6, and a large dimension of the slider 6 provided with the mounting seat or mounting screw is secured. There is no need to perform this operation, and the size of the slider 6 can be reduced.
Therefore, the size of the tool body 1 can be reduced in accordance with the reduction in the size of the slider 6, that is, the size of the cutting tool can be reduced. It is possible to sufficiently cope with a reduction in the diameter of the part. The enlargement of the chuck spindle 3 due to the attachment of the connecting pin 19 to the chuck spindle 3 is slightly smaller than the size required for the chuck spindle 3, and in the present embodiment, the connecting pin 19 Are formed integrally with the key 18 originally attached to the chuck spindle 3, so that the attachment of the connecting pins 19 does not increase the size of the chuck spindle 3. further,
In the present embodiment, the chuck spindle 3 is directly inserted into the mounting hole 1a of the tool body 1, and the connecting pin 19 Is provided,
The diameter of the mounting hole 1a can be reduced by the amount that does not require the coupling, and the size of the tool body 1 can be further reduced, and the number of parts can be reduced.

In the present embodiment, when the connecting pin 19 is slidably fitted in the connecting hole 14 in the circumferential direction of the tool body 1 as described above, the connecting hole 14 is In the direction orthogonal to the above-mentioned generatrix direction (plane P
(In a direction perpendicular to the plane of FIG. 3), whereby the cross section of the connecting pin 19 can be made square as described above. However, at this point, for example, when the connecting hole is formed in a square cross section or a rectangular shape extending in the generatrix direction, the connecting pin is also inserted into the connecting hole and slidable in the circumferential direction. It must be formed in a rectangular cross section extending in the above-mentioned generatrix direction, and the sliding contact area between the coupling pin and the coupling hole in the generatrix direction becomes smaller, or the coupling hole or the communication hole must be larger. Although the rigidity of the slider or the tool body may be impaired, the cutting tool of the present embodiment having the above-described configuration has the connection pin 19 whose size must be limited. Is slidable with respect to the connection hole 14, but it is possible to secure the sliding contact area between the connection pin 19 and the connection hole 14 and to reliably engage the connection in the generatrix direction. spin The slider 6 can be slid more accurately by the advance and retreat of the dollar 3. In this embodiment, as described above, the connection pin 1
9 has a square cross section, but if the connecting pin 19 inserted in the connecting hole 14 is slidable in the circumferential direction, it has a rectangular shape extending in the circumferential direction like the connecting hole 14. Or you may.

Further, in the present embodiment, the connecting hole 14 has a pair of mutually parallel wall surfaces 14a,
14a, and the connecting pin 19 has a pair of mutually parallel side surfaces 19a, 19a having a rectangular cross section as described above and capable of slidingly contacting the wall surfaces 14a, 14a. A larger sliding contact area with the connecting hole 14 can be ensured, so that the connecting pin 19 and the connecting hole 14 can be reliably engaged in the generatrix direction. However, in this embodiment, the connecting pin 19 is formed in a rectangular cross section as described above, and the wall surface 14a,
14a, a pair of parallel side surfaces 19a, 1
9a is formed, for example, by forming the connecting pin 19 into a barrel-shaped cross section by cutting out the outer peripheral surface of the cylinder by a pair of planes parallel to the center line and also parallel to each other. Such a pair of mutually parallel side surfaces may be formed, and in some cases, without forming such side surfaces, for example, the connection pin may be connected to the connection hole 1.
By making the cross section circular in diameter so that it can be inserted into 4, it is possible to engage in the generatrix direction and to be slidable in the circumferential direction.

Furthermore, in the present embodiment, the connecting pin 1
9 is provided on the chuck spindle 3 as the driving member, the chuck spindle 3 is provided with the fine adjustment mechanism 20 for finely adjusting the position of the connecting pin 19 in the generatrix direction, as described above. Key 18 in the range of the elongated insertion holes 18a, 18a formed in the key 18.
Fine adjustment of the position in the direction of the axis O
By screwing 1 and further driving the pin 22,
The position of the connecting pin 19 in the generatrix direction is also finely adjusted and can be positioned. However, in this regard, for example, if the position of the connection hole 14 in the generatrix direction is to be finely adjusted on the slider 6 side, the connection hole 14 of the slider 6 cannot be adjusted.
Is formed as a separate member, which inevitably leads to an increase in the size of the slider 6. However, according to the above configuration, such a situation can be avoided, and the tool body 1 and the cutting It is possible to more reliably promote downsizing of the tool. Moreover, in this way, the chuck spindle 3
Even if the fine adjustment mechanism 20 is provided on the side, the chuck spindle 3
Of the key 1 is small, and the connecting pin 19 is
8, the tool body 1 and the cutting tool do not increase in size as described above.

[0026]

As described above, according to the present invention,
Even if there is a molding error of the parts, the connecting pin is securely inserted into the connecting hole by simple means, but the slider is connected to the driving member. To form a predetermined processed surface with high accuracy. The connecting pin is provided on the driving member side, and it is only necessary to form a connecting hole in the slider. Therefore, the slider can be reduced in size, and accordingly, the tool body can be made compact. Thus, it is possible to provide a cutting tool which can sufficiently cope with the recent reduction in the diameter of the valve hole and the opening thereof.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a front view of the embodiment shown in FIG. 1 as viewed from a front end side in an axis O direction.

FIG. 3 is a sectional view taken along line YY in FIG.

FIG. 4 is a sectional view taken along the line ZZ in FIG. 1;

FIG. 5 is a side sectional view of a chuck spindle 3 as a driving member in the embodiment shown in FIG.

FIG. 6 is a front view of the chuck spindle 3 shown in FIG. 5 as viewed from the tip side in the direction of the axis O.

[Explanation of symbols]

 Reference Signs List 1 tool main body 3 chuck spindle (drive member) 4 cutting edge tip 5 concave groove 6 slider 14 connection hole 14a wall surface of connection hole 14 key 19 connection pin 19a side surface of connection pin 19 20 fine adjustment mechanism O axis of tool body 1 T Tool rotation direction

Claims (4)

[Claims] 1. A slider provided with a cutting edge tip is slidably mounted in a groove formed along a generatrix of a tool body having a substantially frusto-conical shape and rotated around an axis. A drive member is attached to a mounting hole formed in the tool body so as to be integrally rotatable with the tool body and to be able to advance and retreat in the axial direction.
A connection hole is formed to face the communication hole communicating the concave groove and the mounting hole, while the driving member is inserted into the connection hole so as to protrude from the communication hole into the mounting hole and protrude and retract into the connection hole. A connecting pin that is engageable in the direction of the generatrix and is slidably fitted in the circumferential direction of the tool body in the connecting hole. Cutting tools. 2. The connecting hole according to claim 1, wherein the connecting hole is formed in a slot shape extending in a circumferential direction of the tool main body with a width in which the connecting pin can be inserted in the generatrix direction.
The cutting tool according to 1. 3. The connecting hole has a pair of parallel wall surfaces facing each other in the generatrix direction, and the connecting pin has a pair of parallel side surfaces slidable on the wall surfaces. The cutting tool according to claim 1, wherein the cutting tool is formed. 4. The device according to claim 1, wherein the drive member includes a fine adjustment mechanism for finely adjusting the position of the connection pin in the generatrix direction. Cutting tools.