JP2001353604A - Cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting tool capable of stabilizing the slide of a cutting blade tip sliding along a generating line of a conical tool body, and realizing the excellent workability and maintainability. SOLUTION: The cutting tool comprises a recessed groove 11 formed along the generating line L of the tool body l, a slider 16 sliding along the recessed groove 11, a spacer 12 provided between a wall surface 11a of the recessed groove 11 and the slider 16, and an urging device 15 for urging the slider 16 to the wall surface 11a side. The slider 16 has an engaging surface 16k of a V-shaped section so as to be protruded to the spacer 12 side, and the spacer 12 is formed in a V-shape so as to be recessed in the wall surface 11a, and provided with an engaged surface 12k abutted on the engaging surface 16k.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In a valve hole of a cylinder head,
Since the valve frequently hits the periphery of the opening of the valve hole,
In order to improve the durability, a hard member such as a sintered alloy is generally fitted around the periphery of the opening. When machining such a valve hole of a cylinder head, a cutting 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 is used. At this time, since the opening of the valve hole is often formed in a tapered surface shape in accordance with the shape of the valve head, the cutting blade is slidable in a direction oblique to the cutting tool rotation axis. A tip is provided, and the tapered surface is cut by the cutting edge tip.

FIGS. 6 and 7 show examples of a conventional cutting tool for machining a valve hole of a cylinder head.
Here, FIG. 6 is a cross-sectional view of the cutting tool S, and FIG. 7 is a ZZ cross-sectional view of FIG. 6 and 7, the cutting tool S
Is a tool body 1 formed in a substantially conical shape, an adapter 2 disposed between the tool body 1 and a spindle end of a machine tool (not shown), and a hole 1a formed inside the tool body 1. , A hole 2a formed inside the adapter 2 and a hole 1
a, the coupling member 9 inserted into the
, A shaft 4 inserted coaxially into the slide shaft 8, a cutting tip 5 provided on the outer periphery of the tip of the tool body 1, and a cone of the tool body 1. A T-groove 6 is formed along the direction of the generatrix L of the shape, that is, along a direction oblique to the axis O, and a slider 7 slidably mounted in the T-groove 6. The cutting tool S is rotated around the axis O by being mounted on the machine tool. Tool body 1
A bush 3 is mounted along the axis O at the tip of
A hole machining tool such as a gun reamer (not shown)
Shank is inserted.

[0004] Three cutting edge tips 5 are provided on the outer periphery of the tip end portion of the tool body 1, and the cutting edge tips 5 are used to machine the periphery of the opening of the valve hole. However, in FIG. 6, only one cutting edge tip 5A is shown, and illustration of the other two cutting edge tips 5B, 5C is omitted. Of these cutting edge tips 5, two cutting edge tips 5B, 5C are directly fixed to the tool body 1,
On the other hand, one cutting edge tip 5A is detachably fixed to the slider 7. Then, the slider 7 is moved along the T groove 6.
Slides, the cutting edge tip 5A mounted on the slider 7 slides along the generatrix L direction of the tool body 1 formed in a conical shape.

A coupling member 9 inserted into the hole 1a of the tool body 1 is fitted into the hole 1a via a key 9a, and the tool body 1 and the coupling member 9 are integrally formed around an axis O. It is rotatable. The coupling member 9 can move forward and backward in the hole 1a by moving the slide shaft 8 along the axis O. Tool body 1
The T-slot 6 and the hole 1a are formed in a hole 6a opening at the bottom of the T-slot 6.
Are communicated through. A connection pin 10 is attached to the slider 7 and protrudes into the hole 1a through the hole 6a. The tip of the connection pin 10 is inserted into an oblique hole 9b formed in the coupling member 9. Thus, the slider 7 and the coupling member 9 are connected. Then, by moving the coupling member 9 forward and backward through the slide shaft 8, the slider 7 slides along the T groove 6, and the cutting tip 5A slides in a direction oblique to the axis O. ing.

A method of machining a valve hole by using the cutting tool S having such a configuration will be described. First,
Attach a hole machining tool such as a gun reamer to the bush 3. Next, the drilling tool is pulled into the base end side of the tool body 1 by the shaft 4. Then, while rotating the tool body 1, the axis O
, The two cutting blade tips 5B and 5C chamfer the opening of the valve hole. 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 to slide the cutting edge tip 5A via the connection pin 10 and the slider 7. Let it. By doing so, the above-described tapered surface is formed at the periphery of the opening of the valve hole. Then, the inside of the valve hole (valve guide hole) is finished by advancing the hole drilling tool by the shaft 4 while the tool body 1 is being rotated.

[0007]

When a taper surface is formed around the opening of the valve hole by the cutting tool S having the above-described structure, the cutting load acting on the cutting edge tip 5A is transmitted through the slider 7. It is received by the wall surface of the T groove 6 of the tool body 1 (particularly, the wall surface facing the tool rotation direction). Therefore, when the cutting tool S is used for a long period of time, the wall surface of the T-slot 6 may be worn or deformed by the cutting load. Also, the wall surface may be worn by the slider 7 sliding in the T groove 6. And such abrasion causes the slider 7 to rattle,
There is a problem that the processing accuracy of the cutting edge tip 5A is reduced due to the play. That is, the slider 7 does not slide straight but slides so as to be concave at the portion where the wear has occurred, whereby the tapered surface of the opening does not become an accurate conical surface but becomes a curved surface that expands like a drum. was there.

When the above-mentioned wear occurs, the T-groove 6
Of the tool body 1 and the like by re-forming a new wall surface by widening and correcting the width by polishing or the like, and remanufacturing a slider 7 having a size and a shape corresponding to the new T groove 6. Can be considered. However, in such a method, the T-groove 6 must be corrected and the slider 7 must be re-manufactured every time wear occurs, so that there is a problem that workability is reduced and the cost is increased.
In particular, the slider 7 changes its size and shape each time it is re-manufactured, so the design must be redone, resulting in low work efficiency.

Further, when abrasion occurs, T
Maintenance such as re-polishing the groove 6 or replacing the slider 7 must be performed frequently, resulting in reduced production efficiency.

In the cutting tool S, since the cutting edge tip 5A is positioned by the engagement of the T-slot 6 with the slider 7 inserted therein, the molding error of the T-slot 6 and the slider 7 is adjusted. There is no room, and in order to obtain a desired processing accuracy, these T-grooves 6 and sliders 7 must be formed with high accuracy, which is difficult. Further, there is a limit in increasing the mounting rigidity of the slider 7, and this is one of the causes of rattling of the slider 7.

The present invention has been made in view of such circumstances, and when the cutting edge tip slides along the generatrix of the conical tool body, the cutting edge tip can be slid steadily. In addition, an object of the present invention is to provide a cutting tool that can maintain a stable sliding operation even when wear or the like occurs in a slider or a groove, and that can realize good workability and maintainability.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a cutting tool according to the present invention has a substantially conical tool body that rotates around a predetermined axis and a cutting tool formed along a cone generating line of the tool body. A groove provided, a slider slidably provided along the groove, a cutting blade tip attached to the slider, and an inside of the tool body, rotatable integrally with the tool body, and It is provided movably in the direction along the axis,
A cutting tool including a coupling member that is slidable with the slider by engaging with the slider; wherein the concave groove is provided between one of a pair of opposed wall surfaces of the concave groove and the slider. A spacer provided detachably with respect to, and provided between the other wall surface of the pair of wall surfaces and the slider, and an urging device for urging the slider toward the one wall surface side, The slider includes an engagement surface formed in a V-shape such that a cross-sectional shape in a direction intersecting with the generatrix projects toward the spacer.
The spacer is formed in a V-shaped cross section so as to be recessed on the one wall surface side, and includes an engaged surface that comes into contact with the engagement surface.

According to the present invention, by providing a spacer between one side surface of the slider and one wall surface of the concave groove, a cutting load applied to the slider from the cutting edge tip can be applied to the concave groove via the spacer. On the wall. At this time, since the wear and deformation due to the cutting load occur in the spacer, it is possible to prevent the wear and deformation of the concave groove from occurring. Since the spacer is detachably provided in the groove, even if the spacer is worn or deformed, a stable sliding operation can be maintained by replacing the spacer.
As described above, by exchanging the spacer, the processing accuracy by the cutting edge tip can be extremely easily and economically maintained.

Further, since the urging device for urging the slider toward one wall surface of the concave groove is provided, even if the contact surface between the spacer and the slider is worn, the urging force of the urging device causes the slider. Is pressed against the spacer side, so that rattling of the slider due to wear is suppressed,
Accurate cutting can be continued.

By forming the contact surface between the slider and the spacer in a V-shape, the slider slides while being guided by the V-shape, so that a stable sliding operation can be realized. Further, since the slider and the spacer are configured to be engaged with each other by the V-shaped portion, the engaging force is stably maintained. Therefore, since the positional accuracy of the cutting tip is improved, accurate cutting can be performed. Further, since the contact surface between the slider and the spacer is formed in a V-shaped cross section, a cutting load can be received in a wide area. Therefore, the concentration of stress acting on the wall surface of the groove can be reduced, for example, the force acting on the wall surface of the groove can be dispersed on the bottom surface side of the groove.

By providing a space between the slider and the bottom surface of the groove, even if the slider slides inside the groove, no friction is generated against the bottom surface of the groove. That is, only the spacer is worn away, and no wear occurs on the bottom surface of the groove, so that maintenance work such as re-polishing the groove can be eliminated.

Further, the provision of the separation portion allows the slider to move in the direction intersecting the generatrix when rattling occurs on the contact surface between the slider and the spacer. That is, even if rattling occurs, the slider is biased by the biasing device, so that at least one of the two V-shaped slopes of the slider allowed to move is covered with the spacer. It comes into contact with the engagement surface. Therefore, the sliding operation is stably realized.

When at least one of the engaging surface and the engaged surface is provided with a groove formed so as to extend in the generatrix direction, for example, when lubricating oil is supplied between the slider and the spacer, This lubricating oil is stably supplied to the entire contact surface.

By providing a flat plate detachably provided in the concave groove between the other wall surface of the concave groove and the slider, the urging force of the urging device is applied to the slider. Acts uniformly. Therefore, the engagement between the slider and the spacer is stabilized, and the sliding operation is also stabilized. Further, since wear and deformation due to the force acting on the other wall surface of the groove occur in the plate, it is possible to prevent the wear and deformation of the groove from occurring. Then, even when the plate is worn or deformed, a stable sliding operation can be maintained by replacing the plate.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cutting tool according to the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view for explaining a cutting tool of the present invention, and FIG.
FIG. 3 is a sectional view taken along line XX of FIG. In the following description, the same reference numerals are used for the same or equivalent components as those of the cutting tool described with reference to FIG. 6, and the description thereof will be simplified or omitted. In these drawings, illustrations of the adapter 2 and the slide shaft 8 are omitted.

In these figures, a cutting tool S has a substantially conical tool body 1 that rotates around a predetermined axis O, and a concave groove 11 formed along a conical generatrix L of the tool body 1.
And a slider 16 slidably mounted along the concave groove 11, a cutting blade tip 5 </ b> A attached to the slider 16, and inside the tool body 1, which can rotate integrally with the tool body 1. A coupling member 9 is provided so as to be able to advance and retreat along the axis O, and can slide on the slider 16 by engaging with the slider 16.

Further, as shown in FIG.
Are a pair of opposed wall surfaces 11a, 11
b, a spacer 12 is provided between the one wall surface 11a and the slider 16 so as to be detachable from the concave groove 11 and the spacer 12 is provided between the other wall surface 11b and the slider 16. And a biasing device 15 for biasing one wall surface 11a.

As shown in FIG. 1, the slider 16 is a prism-shaped member that is bent in a “C” shape in the generatrix L direction.
The base end side is arranged in the concave groove 11, and the cutting edge tip 5A is detachably attached to the tip end.

The concave groove 11 has a pair of opposed wall surfaces 11a and 11b formed in parallel with each other, and
1a and a bottom surface 11c orthogonal to the wall surface 11b, and are formed to extend in a direction along the generatrix L.
Note that a bottom plate 31 is provided on the bottom 11c of the concave groove 11.

The spacer 12 is detachably attached to one of the wall surfaces 11a of the concave groove 11 by a clamp screw 13. At this time, as shown in FIGS. 2 and 3, the cutting tool S is provided so as to rotate in the direction of arrow T (counterclockwise in FIG. 2).
Is mounted on one wall surface 11a of the groove 11 that faces the rotation direction T of the cutting tool S. On the other hand, a flat plate 14 is provided on the other wall surface 11 b facing the rear side in the rotation direction T of the cutting tool S in the concave groove 11.

The urging device 15 is attached to a mounting hole 11d formed to penetrate perpendicularly to the wall surface 11b from the wall surface 11b of the groove 11 toward the outer peripheral surface of the tool body 1. The urging device 15 includes a pin 17 and an attachment screw (adjustment member) 1 for attaching the pin 17 to the tool body 1.
9 and a disc spring (spring member) 18 disposed between the plate 14 and the mounting screw 19. A cylindrical adjusting ring 20 is fitted on the wall surface 11b side of the mounting hole 11d.
0 is provided so as to abut.

The tip of the pin 17 is, as shown in FIG.
It is provided so as to slightly project from the wall surface 11b into the concave groove 11 through the opening 14a of the plate 14. That is, the tip of the pin 17 is arranged in the opening 14 a formed in the plate 14.

The plate 14 is removably arranged so as to be in close contact with the wall surface 11b and the bottom surface 11c of the groove 11 and extend substantially the entire length of the groove 11. The side surface 14b of the plate 14 facing the rear side in the tool rotation direction T is formed parallel to the side surface 14c that is in close contact with the wall surface 11b. The opening 14a is provided on the side surface 14c which is in close contact with the wall surface 11b.
Is formed substantially at the center.

The disc spring 18 is arranged inside the adjustment ring 20 and is compressed and fitted around the pin 17.
The distal end of the disc spring 18 is in contact with the plate 14, while the proximal end is in contact with the distal end surface of the mounting screw 19. The disc spring 18 constantly presses the plate 14 toward the one wall surface 11a of the concave groove 11 with a constant pressing force by its elastic force. At this time, the disc spring 18
Urges the slider 16 toward the one wall surface 11a via the plate.

The mounting screw 19 formed in an annular shape is connected to the female screw portion 11 in the opening of the mounting hole 11d on the outer peripheral surface side of the tool body 1.
e. The pin 17 is inserted into the central opening 19 a of the mounting screw 19. Then, by tightening or loosening the mounting screw 19 to advance and retreat, the force with which the disc spring 18 presses the plate 14 can be adjusted. Therefore, the urging force of the disc spring 18 against the slider 16 can be adjusted by moving the mounting screw 19 in the forward and backward directions.

Then, the spacer 12 and the plate 14
A slider 16 is slidably fitted in the gap formed by the groove 11 and the bottom surface 11c of the groove 11 in the direction of the generatrix L, that is, in the direction oblique to the axis O.

The spacer 12 is a plate-shaped member formed so as to extend over substantially the entire length of the concave groove 11 when mounted on the tool body 1.
a and the bottom of the clamp screw 13
Is attached to the tool body 1.

As shown in FIG. 3 and FIG.
Surface (engaged surface) 12K on the side facing slider 16
Is formed in a V-shape such that a cross-sectional shape in a direction intersecting with the generating line L is recessed toward one wall surface 11a of the concave groove 11, and includes a first slope 12a and a second slope 12b. The first slope 12 a and the second slope 12 b correspond to the wall surface 1 of the concave groove 11.
It has a predetermined angle with respect to 1a, and is formed in a constant shape so as to extend along the generating line L.

On the other hand, the surface (engaging surface) 16K of the slider 16 on the side facing the spacer 12 has a cross-sectional shape in the direction intersecting with the generatrix L on the spacer 12 side so as to correspond to the surface 12K of the spacer 12. It is formed in a V shape so as to protrude, and includes a first slope 16a and a second slope 16b.

The engagement surface 1 of the slider 16
6K and the engaged surface 12K of the spacer 12 are provided so as to be in contact with each other, and the slider 16 slides the engaging surface 16K with respect to the engaged surface 12K of the spacer 12 in the bus L direction. It is provided movably.

Of the contact surfaces between the spacer 12 and the slider 16, the first inclined surface 16a of the slider 16 has a groove 16e formed to extend in the direction of the generatrix L. The groove 16 e is formed between the spacer 12 and the slider 1.
The lubricating oil supplied between the first and second lubricating oils 6 is distributed stably throughout the entirety of the lubricating oil. The grooves 16e allow the sliding operation to be performed smoothly.

The size of the cross section of the first slope 16 a of the slider 16 is set smaller than the size of the cross section of the first slope 12 b of the spacer 12. Further, a separation portion 30 is formed between the slider 16 and the bottom surface 11c of the concave groove 11. The slider 16 is moved by the separation portion 30 so that the
1 slides along the bottom 16 of the slider 16
No friction occurs between the groove c and the bottom surface 11c of the concave groove 11.

As with the cutting tool S shown in FIG. 6, in the cutting tool S of this embodiment, three cutting blade tips 5 are attached to the tip of the tool body 1.
One cutting edge tip 5A is mounted on the slider 16 so as to be slidable, and the other two cutting edge tips 5B and 5C are fixed to the tip of the tool body 1 as shown in FIG. Have been. The three cutting blade tips 5 are arranged at equal intervals in the circumferential direction of the tool main body 1 and shifted from each other in the direction of the axis O of the tool main body 1.

Here, FIG. 5 shows these cutting blade tips 5A,
5B shows a rotation locus about an axis O drawn by 5B and 5C. As shown in FIG. 5, two cutting blade tips 5B, 5C
Is a cutting edge portion 5 provided for the cutting on the rotation locus.
b and 5c are arranged so as to cross each other at an obtuse angle. The cutting edge tip 5A moves the movement locus R of the cutting edge portion 5a drawn by sliding the slider 16 on the rotation locus to the cutting edge portion 5b of the cutting edge tip 5B, 5C.
5c, and the movement locus R is set so as to intersect both cutting edge portions 5b, 5c at an obtuse angle.

A cutting method using the cutting tool S having the above-described configuration will be described. Here, a method of processing a valve hole using the cutting tool S will be described. The machining method according to the present embodiment includes a step of attaching a hole machining tool such as a gun reamer to the tip of the tool body 1 and a step of attaching a cutting tool S to a spindle end of a machine tool via an adapter or the like to perform machining. Have. In addition, the step of performing the cutting includes a step of chamfering with the cutting edge chips 5B and 5C, a step of forming a tapered surface with the cutting edge tip 5A, and a step of finishing the hole itself with a hole drilling tool. Have.

First, a drilling tool is mounted on the tool body 1. Next, the drilling tool is pulled into the base end side of the tool body 1 by the shaft 4. Then, with the drilling tool retracted,
The tool body 1 is rotated about its axis O and feed is given in the axis O direction. Then, the cutting blade tips 5B, 5C
As a result, as shown in FIG.
Is formed. However, in FIG. 5, what is indicated by reference numeral SS is a hard member such as a sintered alloy fitted to the periphery of the opening such as the valve hole as described above.

After forming the chamfers C, C, the tool main body 1 is slightly retracted once while the tool main body 1 is being rotated, and then a slide shaft (not shown) (corresponding to the slide shaft 8 in FIG. 6).
And the coupling member 9 is advanced. As the coupling member 9 advances, the slider 16 is slid in the direction of the generatrix L via the connecting pin 10. The cutting edge tip 5A attached to the slider 16 is moved along a movement path R shown in FIG. Then, the tapered surface P is formed at the opening of the hole by the sliding cutting edge tip 5A.

At this time, the cutting load acting on the cutting edge tip 5A when forming the tapered surface P is received by the spacer 12 mainly located on the rear side in the tool rotation direction T via the slider 16. Therefore, abrasion and deformation due to the cutting load occur in the spacer 12, and the concave groove 11, that is, the tool body 1 does not wear or deform. Further, wear caused by sliding the slider 16 is also generated on the spacer 12 and the plate 14, so that damage to the tool body 1 can be suppressed.

The contact surface between the slider 16 and the spacer 12 is V-shaped, and the sliding operation of the slider 16 is performed while being guided by the V-shaped portion. Therefore,
When the slider 16 slides, the occurrence of rattling or the like is suppressed. Also, slider 1
Since the contact surface between the spacer 6 and the spacer 12 has a V-shaped cross section, the cutting load can be received in a wide area.

The slider 16 slides while being constantly urged by the urging device 15 toward the spacer 12 with a constant urging force.

As described above, when the tapered surface P is formed by the slidable cutting blade tip 5A, the drilling tool is advanced and inserted into the valve hole while the rotation of the tool body 1 is maintained. The hole drilling tool inserted inside the valve hole performs finishing of the valve hole itself.

As described above, the cutting tool S of the present invention
According to this, it is possible to continue the cutting operation without any trouble even if a little wear occurs, whereby the replacement interval of the spacer 12 and the slider 16 can be extended to extend the tool life. In addition, labor required for maintenance and the like can be reduced.

That is, the slider 16 and the spacer 1
The slider 16 can be stably slid while being guided by the V-shaped section by forming the contact surface with the V-shaped section 2 in a V-shaped cross section. Furthermore, the slider 16 and the spacer 12 are formed with a V-shaped portion, ie, the engaging surface 16K and the
Since they are configured to be engaged with each other by K, the engagement force is stably maintained. Therefore, a high-precision sliding operation is realized, and the positional accuracy of the cutting tip 5A is improved, so that accurate cutting can be performed. Further, since the engagement surface between the slider 16 and the spacer 12 is formed in a V-shaped cross section, a cutting load can be received in a wide area. Therefore, the wall surface 1 of the concave groove 11
The concentration of stress acting on the wall surface 11a of the concave groove 11 can be reduced, for example, by dispersing the force acting on 1a to the bottom surface 11c side of the concave groove 11.

The cutting tool S is mounted on the other wall surface 11 of the concave groove 11.
On the b side, there is provided an urging device 15 for urging the slider 16 toward the one wall surface 11a via the plate 14, so that the slider 16 always has a constant urging force.
This is a configuration pressed against No. 2. Therefore, even if abrasion or deformation due to the cutting load or the sliding of the slider 16 occurs on the spacer 12 or the slider 16, the engagement force can be maintained to prevent the slider 16 from rattling. That is, by constantly urging the slider 16 to the side surface 11a with a constant urging force by the urging device 15, the mounting rigidity of the slider 16 itself can be improved, and not only wear and deformation but also excessive cutting load can be achieved. Even if such a function is applied, the slider 16 is firmly held to prevent rattling, and stable processing can be performed. Also, since the mounting rigidity of the slider 16 is improved, the slider 1
The mounting accuracy of 6 is increased. Therefore, the cutting tip 5
Since the position accuracy of A is also improved, the processing accuracy by the cutting tool S is improved.

In the present embodiment, the biasing device 15
Pin 17 as a pressing member, plate 14, disc spring 18 as a spring member, and mounting screw 1 as an adjusting member
The pressing force of the disc spring 18 is adjusted by moving the mounting screw 19 forward and backward as described above, and the urging force of the urging device 15 can be adjusted. For this reason, it is possible to prevent a situation in which the sliding of the slider 16 is obstructed by an excessive urging force, and on the other hand, abrasion or the like occurs on the engaging surface 16 of the slider 16 and the engaged surface 12K of the spacer 12. In this case, by increasing the urging force, it is possible to more reliably prevent the slider 16 from rattling, and it is possible to further extend the tool life.

In this embodiment, the urging device 1
An adjusting ring 20 is fitted on the wall surface 11b side of the mounting hole 11d for accommodating the mounting hole 5 so that the mounting screw 19 is prevented from being further tightened on the wall surface 11b side by contacting the adjusting ring 20. It has been done. Therefore, by replacing the adjusting ring 20 with one having a different height, the tightening position of the mounting screw 19 can be appropriately set, and the urging force is adjusted by tightening the mounting screw 19 accordingly. This makes it possible to adjust the urging force more easily and accurately.

The disc spring 18 of the urging device 15 is configured to urge the slider 16 via the plate 14, whereby the urging force of the urging device 15 is uniformly transmitted to the slider 16 to allow the spacer 16 to move. 12 and the slider 16 can be stably engaged, and the slider 16 can be slid smoothly. Furthermore, since the adjustment of the urging force of the urging device 15 by the rotation of the mounting screw 19 can be performed from the side of the mounting hole 11d which is open to the outer peripheral surface of the tool body 1, it is extremely easy without removing the slider 16 or the like. The advantage is also obtained that the adjustment can be carried out at the same time.

The provision of the separation portion 30 between the slider 16 and the bottom surface 11c of the concave groove 11 allows the slider 16
Does not wear the bottom surface 11c of the concave groove 11 even if it slides inside the concave groove 11. That is, since only the spacer 12 and the plate 14 are worn away, it is possible to eliminate maintenance work such as re-polishing the concave groove 11.

Since the spacer 12 and the plate 14 are detachably attached to the tool body 1, when wear or deformation occurs, it is very easy to recover the processing accuracy by replacing these members. Can be. In addition, the member to be replaced may be of the same standard as the member before replacement, and it is not necessary to redesign the member every time wear occurs, which is extremely economical.

The provision of the separation portion 30 allows the slider 16 to move in the direction intersecting with the generatrix L to a certain extent when rattling occurs between the slider 16 and the spacer 12. In other words, even when rattling occurs, the slider 16 is urged by the urging device 15 to move at least one of the two V-shaped slopes 16a and 16b of the slider 16 allowed to move. The slopes 16a, 16b are in contact with the engaged surfaces 12K (12a, 12b) of the spacer 12. Therefore, the sliding operation is stably realized.
Then, even if an uneven portion is formed inside the concave groove 11 due to rattling, abrasion, or the like, since the unevenness is absorbed by the separation portion 30, the sliding operation can be performed more stably.

Of the contact surfaces between the slider 16 and the spacer 12, the slider 16 is formed with a groove 16e so as to extend in the generatrix L direction.
When lubricating oil is supplied between the spacer 6 and the spacer 12, the lubricating oil is stably supplied to the entire contact surface.

Although only one biasing device 15 is shown in the present embodiment, a plurality of biasing devices are provided in parallel with the direction of the generating line L on which the slider 16 slides. May be further enhanced.

[0058]

The cutting tool according to the present invention has the following effects. Since the contact surface between the slider and the spacer is formed in a V-shape, the slider can slide stably while being guided by the V-shaped portion. Further, since the slider and the spacer are configured to be engaged with each other by the V-shaped portion, the engaging force is stably maintained. Therefore, since the positional accuracy of the cutting tip is improved, accurate cutting can be performed. Further, since the contact surface between the slider and the spacer is formed in a V-shaped cross section, a cutting load can be received in a wide area. Therefore, the concentration of stress acting on the wall surface of the groove can be reduced, for example, the force acting on the wall surface of the groove can be dispersed on the bottom surface side of the groove.

Since the abrasion and deformation due to the cutting load occur on the spacer and the plate, it is possible to prevent the abrasion and deformation of the groove. At this time, since the spacer and the plate are provided detachably with respect to the tool main body, when wear or deformation occurs, these members may be replaced, and maintenance can be easily performed. .

By providing the separation between the slider and the bottom surface of the groove, the bottom surface of the groove is not worn even if the slider slides inside the groove. Therefore, maintenance work such as re-polishing the concave groove can be eliminated. Further, even if rattling occurs between the slider and the spacer, at least one of the two V-shaped slopes of the slider allowed to move by urging the slider with the urging device. Is in contact with the engaged surface of the spacer. Therefore, the sliding operation is stably realized.

By providing a groove formed in the contact surface between the slider and the spacer so as to extend in the generatrix direction, for example, when lubricating oil is supplied between the slider and the spacer, the lubricating oil contacts the spacer. Stable supply over the entire surface.

Of the pair of opposed wall surfaces of the concave groove,
By providing a flat plate between the other wall surface and the slider, the urging force of the urging device is uniformly applied to the slider. Therefore, the engagement between the slider and the spacer is stabilized, and the sliding operation is also stabilized.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating one embodiment of a cutting tool according to the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a sectional view taken along line XX of FIG. 1;

FIG. 4 is a diagram for explaining a slider and a spacer.

FIG. 5 is a diagram for explaining a rotation trajectory of the cutting edge tip around an axis.

FIG. 6 is a cross-sectional view for explaining a conventional cutting tool.

FIG. 7 is a sectional view taken along the line ZZ of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tool main body 5A, 5B, 5C Cutting edge tip 8 Slide shaft 9 Coupling member 10 Connecting pin 11 Concave groove 11a, 11b Wall surface of concave groove 11c Bottom of concave groove 12 Spacer 12K Engagement surface 14 Plate 15 Biasing device 16 Slider 16K Engagement surface 16e Groove 17 Pin 18 Disc spring (spring member) 19 Set screw (adjustment member) 20 Adjustment ring 30 Separated portion L Bus bar S Cutting tool

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3C037 BB15 EE05 3C046 LL02 LL07

Claims (4)

[Claims] 1. A substantially conical tool main body that rotates around a predetermined axis, a concave groove formed along a generating line of a cone of the tool main body, and a slidably provided along the concave groove. A slider, a cutting edge tip attached to the slider, and provided inside the tool body so as to be rotatable integrally with the tool body and movable in a direction along the axis, and to engage with the slider to engage the slider. A cutting tool comprising a coupling member slidable with a slider, wherein the cutting tool is provided between one of a pair of opposed wall surfaces of the concave groove and the slider so as to be detachable from the concave groove. A spacer, and a biasing device provided between the other wall surface of the pair of wall surfaces and the slider, and biasing the slider toward the one wall surface, wherein the slider intersects the bus bar. One A V-shaped engaging surface formed so that a cross-sectional shape of the spacer protrudes toward the spacer side; and the spacer is formed in a V-shaped cross-section so as to be recessed on the one wall surface side. A cutting tool comprising an engaged surface that comes into contact with an engaging surface. 2. The cutting tool according to claim 1, further comprising a separation portion between the slider and a bottom surface of the groove. 3. The cutting tool according to claim 1, wherein at least one of the engaging surface and the engaged surface includes:
A cutting tool comprising a groove formed so as to extend in the generatrix direction. 4. The cutting tool according to claim 1, wherein a flat plate is provided between the other wall surface of the groove and the slider so as to be detachable from the groove. A cutting tool comprising a plate in a shape of a circle.