JP2748847B2 - Cutting tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In such a valve hole of a cylinder head, a valve frequently comes into contact with the periphery of the opening of the hole. Therefore, a hard member such as a sintered alloy is fitted into this portion to improve durability. I'm trying to get. Therefore, as a cutting tool for machining the valve hole, 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 is used. Moreover, the opening is often formed in a tapered surface shape in accordance with the shape of the valve head, so that the cutting edge tip is positioned with respect to the rotation axis of the cutting tool so that such a surface can be cut. It is desirable to be mounted slidably in the oblique direction.

FIGS. 5 and 6 show an example of a conventional cutting tool used for machining such a valve hole. In these figures, the tool body 1 has a substantially conical shape, is mounted via an adapter 2 on a spindle end or the like of a machine tool (not shown), and is rotated around its axis O for cutting. A bush 3 is mounted on the tip of the tool body 1 along the axis O. A shank of a hole machining tool (not shown) such as the above-mentioned gun reamer is fitted into the bush 3 to thereby insert the tool body 1. By finishing the hole machining tool while rotating the hole, the hole itself can be finished. The advance of the drilling tool is performed by a shaft 4 which is coaxially inserted into a slide shaft described later.

Further, three cutting blade tips 5 are provided on the outer periphery of the distal end of the tool body 1, and the cutting edges 5 are used to machine the above-mentioned peripheral edge of the valve hole. I have. However, only one cutting edge tip 5A is shown in FIG. 5, and the other two cutting edge tips 5A are shown.
B and 5C are not shown. Here, among these cutting edge tips 5, the two cutting edge tips 5B and 5C are directly fixed to the tool body 1, while the one cutting edge tip 5A is slidable as described above. Installed. That is, the tool body 1 is formed with a T-shaped groove 6 as shown in FIG. 6 along the direction of the conical generating line of the tool body 1, that is, along the direction oblique to the axis O. The slider 7 is slidably fitted into the slider 7, and the cutting blade tip 5A is detachably fixed to the slider 7.

On the other hand, holes 1a and 2a are formed along the axis O inside the tool body 1 and the adapter 2, respectively, and the slide shaft 8 and the coupling member 9 are inserted into these holes 1a and 2a. Have been. 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 rotate integrally about the axis O, and the slide shaft 8
Is allowed to advance and retreat in the hole 1a. Further, the T-groove 6 and the hole 1a of the tool main body 1 communicate with each other via a hole 6a opened on the bottom surface of the T-groove 6. The slider 7 passes through the hole 6a and the hole 1a
The slider 7 and the coupling member 9 are connected by fitting the tip of the connection pin 10 into the oblique hole 9 b formed in the coupling member 9. I have. By moving the coupling member 9 forward and backward via the slide shaft 8, the slider 7 slides along the T groove 6, and the cutting edge tip 5A slides in a direction oblique to the axis O. I have.

In order to perform the above-described machining of the valve hole with the cutting tool having such a configuration, a hole machining tool such as a gun reamer is mounted on the bush 3 and drawn into the base end side of the tool body 1 by the shaft 4. Then, the tool body 1 is rotated and feed is given in the direction of the axis O. First, the opening of the valve hole is chamfered by the two cutting blade tips 5B and 5C. Next, after the tool main body 1 is once slightly retracted, the slide shaft 8 and the coupling member 9 are advanced while rotating the tool main body 1 to slide the cutting tip 5A via the connecting pin 10 and the slider 7. As a result, the above-described tapered surface is formed on the periphery of the opening of the valve hole. Thereafter, the hole drilling tool is advanced by the shaft 4 while the tool body 1 is being rotated, and finishing inside the valve hole (valve guide hole) is performed.

[0007]

By the way, in the cutting tool having the above-described structure, when the tapered surface is formed on the periphery of the opening of the valve hole as described above, the cutting load acting on the cutting edge tip 5A is reduced by the slider 7. Is received by the wall surface of the T-slot 6 of the tool main body 1 (particularly, the wall surface facing the tool rotation direction) through the tool, so that during such long-term use, the wall surface of the T-slot 6 is worn out by such a cutting load. Deformation occurs. Also, the wall surface will be worn by the slider 7 sliding in the T groove 6. Such abrasion may cause rattling of the slider 7, which may impair the processing accuracy of the cutting edge tip 5 </ b> A. Specifically, the slider 7 does not slide straight, but slides in a recessed portion at the portion where the wear has occurred, so that the tapered surface does not become an accurate conical surface but becomes a curved surface that expands like a drum. Would.

When such wear occurs in the cutting tool having the above-mentioned structure, the T-groove 6 is widened and corrected by polishing or the like to form a new wall surface, and the new T-groove 6 is formed. The slider 7 having a size and a shape corresponding to the above is re-manufactured to reuse the tool body 1 and the like. However, when such measures are taken,
Since the T-slot 6 must be modified and the slider 7 must be re-manufactured every time wear occurs, the operation is inevitably complicated, and the dimensions and shape of the slider 7 change each time it is re-manufactured. You have to redo the design. For this reason, there is a possibility that reusing the tool body 1 may result in an uneconomical situation. Further, when wear occurs, the T-groove 6
Has to be polished again and the slider 7 needs to be replaced, so that maintenance work must be performed relatively frequently.

In the cutting tool having the above-described structure, the cutting edge tip 5A is positioned by the engagement between the T-slot 6 and the slider 7 inserted into the T-slot 6, so that the molding error of the T-slot 6 and the slider 7 is reduced. There is no room for adjustment, and in order to obtain desired processing accuracy, these T-grooves 6 and sliders 7 must also be formed with high precision, 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 causing the rattle of the slider 7. The present invention has been made under such a background, and it is needless to say that it is possible to avoid a situation such as re-polishing of a groove when wear occurs and re-manufacture of a slider in accordance with this. It is another object of the present invention to provide a cutting tool which can omit maintenance work to some extent even if abrasion occurs, and can further improve the mounting rigidity of the slider.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and achieve such an object, the present invention provides a substantially conical tool body rotated about an axis along a generatrix of the cone. A concave groove is formed, and a slider having a cutting blade tip is slidably mounted along the concave groove in the concave groove, and inside the tool main body, rotates integrally with the tool main body. A cutting tool comprising a coupling member which is capable of being moved and retractable along the axis, and which engages with the slider to slide the slider. Of the wall surfaces, between one of the wall surfaces and the slider, a spacer having an engaging portion extending in the direction of the generatrix is detachably interposed, and
On one side of the slider that is brought into contact with the spacer, an engaged portion that engages with the engaging portion is formed, and between the other wall surface of the pair of wall surfaces and the slider. A wedge member that pushes the slider against the one wall surface by being pushed into the bottom surface side of the concave groove to engage the engaging portion and the engaged portion is removably interposed, and further, The wedge member is provided with biasing means for biasing the wedge member toward the bottom surface of the concave groove.

[0011]

In the cutting tool having such a configuration, the spacer and the wedge member are removably interposed between the side surface of the slider and the wall surface of the concave groove facing each other. The applied cutting load is received by the wall surface through the spacer and the wedge member, so that wear and deformation due to the cutting load also occur in the spacer and the wedge member. In addition, wear due to sliding of the slider also occurs in these spacers and wedge members, so even if such wear or deformation occurs, without re-forming the groove or remanufacturing the slider. By exchanging these members, it is possible to extremely easily and economically maintain the processing accuracy.

Further, in the above cutting tool, by pushing a wedge member disposed on the other wall surface side of the pair of wall surfaces of the concave groove, the slider is pressed by one wall surface side to be engaged with the engagement portion. The slider and the cutting edge tip are positioned. For this reason, it is possible to allow a molding error occurring in the slider and the concave groove to a certain extent, and it is possible to reduce the labor involved in the molding, and to improve the mounting rigidity of the slider. In addition, the wedge member is provided with biasing means for biasing the wedge member toward the bottom surface of the concave groove, and the wedge member is constantly biased toward the bottom surface of the concave groove by the biasing means. It is pressed against one wall surface of the groove. For this reason, even if some wear occurs between the engaged portion of the spacer and the slider and the engaged portion, the slider is pressed against the spacer by the urging force of the urging means, so that the slider rattles. , And the cutting can be continued.

[0013]

FIG. 1 to FIG. 3 show an embodiment of the present invention. This embodiment has the same basic structure as the conventional cutting tool shown in FIG. Are assigned the same reference numerals to simplify the description. In these figures, the illustration of the adapter 2 and the slide shaft 8 is omitted. In this embodiment, instead of the T-slot 6 formed in the tool body 1 of the conventional cutting tool, a pair of opposed wall surfaces 11a and 11b parallel to each other and a bottom surface 11c orthogonal to these wall surfaces 11a and 11b are used. A defined groove 11 is formed along the direction of the generatrix of the tool body 1 having a substantially conical shape, and a wall surface 11a facing the tool rotation direction (counterclockwise in FIG. 2) T in the groove 11. A spacer 12 is attached to the side, and a wedge member 13 is detachably attached to the wall surface 11b facing the rear side in the tool rotation direction T by clamp bolts 14,. The clamp bolts 15 for attaching the wedge members 13 also serve as adjustment bolts for urging means described later. A slider 16 is slidably fitted in a gap defined by the spacer 12, the wedge member 13, and the bottom surface 11c of the concave groove 11 in the generatrix direction, that is, the direction oblique to the axis O. ing.

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 serration groove 12a having a wavy cross section is formed on the inside of the concave groove 11, that is, on the side surface facing the tool rotation direction T, so as to extend along the generatrix direction. Therefore, it is the engaging portion in the present embodiment. Also, the wedge member 13
Like the spacer 12, the groove 13 is formed so as to extend over the entire length of the concave groove 11 when mounted on the tool body 1, and the surface 13a facing the tool rotation direction T is the surface 13a.
1b, the inner surface of the concave groove 11, that is, the surface 13b facing the rear side in the tool rotation direction T, the inclined surface facing the side surface 13a side toward the bottom surface 11c side of the concave groove 11. Have been.

On the other hand, the slider 16 is a prism-shaped member which is bent in a "-" shape as shown in FIG. The cutting blade tip 5A is detachably attached.
A tool body 1 is provided at the base end of the slider 16.
A serration groove 16a having a corrugated cross section that is in close contact with the serration groove 16 of the spacer 12 is formed on one side surface facing the wall surface 11a side in the mounting state to the engaged portion in the present embodiment. The other side surface 16b facing the wall surface 11b opposite to the one side surface corresponds to the inclination formed by the side surface 13b of the wedge member 13, and the serration groove 16a moves toward the bottom surface 11c of the concave groove 11. Is formed as an inclined surface that is separated from the side of the one side surface. As shown in FIG. 3, the slider 16 is provided with the serration groove 16a.
The serration groove 12a of the wedge member 13 is engaged with the other side surface 16b.
3b, and the bottom surface 16c thereof is in close contact with the bottom surface 11c of the concave groove 11, respectively, and is slidably fitted in the gap.

Further, the wedge member 13 is provided with an urging means 17, and in the present embodiment, the urging means 17 is provided.
Is a clamp bolt 15 as an adjustment bolt, a washer 18 disposed on the back surface of the head 15a of the clamp bolt 15, and a plate as a spring member interposed between the washer 18 and the wedge member 13. And a spring 19. That is, a screw hole 11d is formed perpendicularly to the bottom surface 11c on the wall surface 11b side of the bottom surface 11c of the concave groove 11, while the wedge member 13 is coaxial with the screw hole 11d in the above-described mounted state. Insertion hole 20 is provided so as to pass through. This insertion hole 20 is
The diameter of the clamp bolt 15 is formed so as to increase in three stages from the bottom surface 11c side (the lower side in FIG. 3) toward the outer peripheral side (the upper side in FIG. 3) of the tool body 1. The shaft 15b is inserted into the hole 20a, penetrates the insertion hole 20, and is screwed into the screw hole 11d. The head 15a is inserted into the insertion hole 20.
Is stored in the upper hole 20a of the largest diameter.

The disc spring 19 is loosely inserted into the shaft portion 15b of the clamp bolt 15 and housed in a compressed state in the middle hole 20c of the insertion hole 20. While contacting the washer 18,
The lower end is in contact with the annular bottom surface of the middle hole 20 c of the insertion hole 20. Accordingly, the bottom surface of the hole 20c is constantly pressed by the elastic force of the coned disc spring 19 to expand, and the wedge member 13 also moves the wall surface 11 of the concave groove 11 accordingly.
Accordingly, it is always pressed against the bottom surface 11c along the line b to be urged. Further, by tightening or loosening the clamp bolt 15 serving as an adjustment bolt into the screw hole 11d, the pressing force of the disc spring 19 against the bottom surface of the concave portion 20c can be appropriately adjusted. The urging force for urging the wedge member 13 can also be adjusted.

In this embodiment, the bottom of the screw hole 11d is formed in a cylindrical hole shape and the clamp bolt 1d is formed.
5 is formed in the shape of a cylindrical shaft having a smaller diameter than this, and the tip of the clamp bolt 15 is brought into contact with the bottom of the screw hole 11d so that the maximum tightening amount of the clamp bolt 15 is reduced. It can be adjusted. Therefore, according to the present embodiment, it is possible to adjust the clamping force by adjusting the length of the clamp bolt 15. However, in this case, the clamp bolt 15 and the screw hole 11d have a bolt shape and a body shape that can be abutted as described above. In the present embodiment, the urging member 17 is moved along the generatrix direction.
3 are provided, the number of the urging means 17 may be appropriately set according to the size of the tool body 1, processing conditions, and the like. At least one of the urging means 17 is a wedge member 13.
It is sufficient if it is provided in. Further, a coil spring may be used instead of the disc spring 19 as the spring member.

On the other hand, also in this embodiment, three cutting blade tips 5 are attached to the tip of the tool body 1, and one of the cutting blade tips 5A is mounted on the slider 16 and can slide. It has become. On the other hand, the other two cutting edge tips 5B and 5C are fixed to the tip of the tool body 1 as shown in FIG. The tool bodies 1 are arranged so as to be equidistantly shifted from each other in the direction of the axis O of the tool body 1. Here, FIG. 4 shows these cutting blade tips 5A, 5A.
B and 5C show the rotation trajectory about the axis O drawn by the two cutting blade tips 5 as shown in FIG.
B and 5C are arranged such that the cutting edge portions 5b and 5c used for the cutting intersect each other at an obtuse angle in the rotation locus. The cutting locus R of the cutting tip 5A is drawn by sliding the slider 16 on the rotational locus so that the moving locus R drawn by the cutting edge portion 5a is located between the cutting edges 5b and 5c of the cutting tips 5B and 5C. Thus, it is disposed so as to intersect both cutting edge portions 5b and 5c at an obtuse angle.

Also in the cutting tool having such a configuration, the tool body 1 is provided with a hole machining tool such as a gun reamer at the tip thereof, and is attached to a spindle end of a machine tool via an adapter or the like to perform cutting. Provided. That is, the tool body 1 is fed in the direction of the axis O while rotating the tool body 1 around the axis O in a state where the hole drilling tool is retracted to the base end side as shown in FIG. Then, chamfers C, C are formed in the openings of the holes. However, in FIG. 4, what is indicated by reference symbol S is a hard member such as a sintered alloy that is fitted to the periphery of the opening such as the valve hole as described above. Then, after the chamfers C and C are formed, the tool main body 1 is slightly retracted once while the tool main body 1 is being rotated, and then the coupling member 9 is advanced by protruding a slide shaft (not shown) so as to be connected. The slider 16 is slid in the generatrix direction via the pin 10 to move the cutting blade tip 5A along the movement locus R, thereby forming a tapered surface P at the opening of the hole. Thereafter, while the tool body 1 is still rotating, the hole drilling tool such as the gun reamer is advanced and inserted into the valve hole, and the valve hole itself is finished.

In the cutting tool having the above-described configuration, the cutting load acting on the cutting edge tip 5A when forming the tapered surface P is applied via the slider 16 to the spacer located mainly on the rear side in the tool rotation direction T. 12 will be accepted. 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 also occurs on the spacer 12 and the wedge member 13, and the tool body 1 is not damaged. The spacer 12 and the wedge member 13
Are removably attached to the tool body 1 by the clamp bolts 14, 15,..., So that when they are worn or deformed, these members are replaced to recover the machining accuracy and the like very easily. can do. In addition, the member to be replaced may be of the same standard as the member before replacement, and it is extremely economical because there is no need to redesign the member every time wear occurs. This is the same when the slider 16 is replaced.

In the cutting tool having the above structure, the wedge member 13 is pushed into the bottom surface 11c of the concave groove 11 so that
The wedge effect acts between the side surface 16b of the slider 16 and the side surface 13b of the wedge member 13 which are inclined and adhere to each other.
1, the serration groove (engaged portion) 16a is brought into contact with and engaged with the serration groove (engagement portion) 12a of the spacer 12. And
As a result, the degree of engagement between the serration grooves 12a and 16a can be increased, and the positional accuracy of the cutting edge tip 5A can be improved. Moreover, in the cutting tool having the above configuration, the wedge member 13 is provided with the urging means 17, and the wedge member 13 is constantly urged toward the bottom surface 11 c of the concave groove 11 by the urging means 17. For,
The above-described wedge effect is always applied irrespective of cutting or non-cutting, and the slider 16 is pressed against the wall surface 11a side of the concave groove 11 according to the elastic force of the disc spring 19 of the urging means 17. Hold.

Therefore, according to the cutting tool having the above-mentioned structure, even if the cutting load or the abrasion or deformation accompanying the sliding of the slider 16 is reduced, the engagement portion (the serration groove 12a) on the spacer 12 side.
And the engaged portion on the slider 16 side (the serration groove 16
a) Even if it occurs between the slider 16 and the wedge member 13, the engagement force and the close contact between the side surfaces 16b and 13b can be maintained, and the slider 16 can be prevented from rattling. Therefore, it is possible to continue the cutting operation without any trouble even if slight wear occurs, thereby extending the replacement interval of the spacer 12, the wedge member 13, or the slider 16 to extend the tool life. And labor required for maintenance and the like can be reduced.

In addition, since the slider 16 is constantly urged toward the side surface 11a by the urging means 17 with a constant urging force, the mounting rigidity of the slider 16 itself can be improved, and the slider 16 can be worn or deformed. However, even if an excessive cutting load or the like acts, the slider 16 can be firmly held to prevent rattling and perform stable processing. In addition, since the mounting rigidity of the slider 16 is improved as described above, the mounting accuracy of the slider 16 can be increased, and the positional accuracy of the cutting edge tip 5A can be increased. It is also possible to do.

Further, in the urging means 17 of this embodiment, the pressing force of the disc spring 19 is adjusted by loosening or screwing the clamp bolt 15 as described above, so that the urging force of the urging means 17 is adjusted. Can be adjusted, so that the pressing force of the wedge member 13 pressing the slider 16 can also be adjusted appropriately. In addition, in this embodiment, the maximum tightening amount can be adjusted by abutting the tip of the clamp bolt 15 against the bottom of the screw hole 11d, so that the length of the clamp bolt 15 is appropriately set. Thus, the pressing force of the disc spring 19 can be kept constant. Therefore, by adopting such an abutting method, the urging force can be freely adjusted, and a constant urging force can be obtained without any variation particularly in assembling. By making the biasing force of the biasing means 17 adjustable as described above, it is possible to prevent a situation in which the sliding of the slider 16 is hindered by an excessive pressing force. When the engaged portion is worn, etc., the urging force is increased to strongly press the slider 16, and the engagement between the engaging portion and the engaged portion is further strengthened, so that the play of the slider 16 is further ensured. The tool life can be further extended.

Further, in this embodiment, the spacer 12
The engaging portion of the slider 16 and the engaged portion of the slider 16 are the serration grooves 12a and 16a having a corrugated cross section which can be in close contact with each other. Since it is possible, it is possible to further improve the positional accuracy of the cutting edge tip 5A and perform a cutting operation with higher accuracy. In this embodiment, the engaging portion and the engaged portion are formed by serration grooves 12 having a corrugated cross section.
a and 16a, the slider 1 may be used as a serration groove having a saw-tooth cross section to increase the contact area.
The mounting rigidity of No. 6 can be improved. Further, even if the engaging portion and the engaged portion are simply constituted by the key-shaped protrusion and the key-groove-shaped concave portion, if the spacer 12 and the urging means 15 are provided, the slider 16 can be replaced. It is possible to obtain effects such as economical efficiency and prevention of rattling against wear.

In the above embodiment, the wedge member 13 presses the slider 16 with the opposed wall surfaces 11a and 11b of the concave groove 11 being parallel, and the side surface 13b of the wedge member 13 and the side surface 16b of the slider 16 being inclined surfaces. The side wall 1b of the wedge member 13 which is in close contact with the wall surface 11b of the groove 11 faces the tool rotation direction T side.
3a is an inclined surface approaching the wall surface 11a toward the bottom surface 11c, and the side surface 16b of the slider 16 and the side surface 13b of the wedge member 13 are formed by the tool body 1
It may be made parallel to the wall surface 11a in the state of being mounted on the wall. In the cutting tool having such a configuration, it is not necessary to form an inclined surface on the slider 16, and therefore, there is an advantage that the cutting tool can be easily manufactured.

[0028]

As described above, according to the present invention, the cutting load acting from the cutting edge tip via the slider and the wear and deformation due to the sliding of the slider are mainly caused between the slider and the wall surface of the concave groove. This will occur in the interposed spacer, and in such a case, by replacing these members, it is possible to easily recover the mounting accuracy and position accuracy of the slider and maintain the processing accuracy, These members are economical because the standard does not change every time they are replaced. Further, since the engaging portion and the engaged portion that engage with each other are formed between the spacer and the slider, the mounting rigidity of the slider can be improved. Furthermore, since the wedge member is always urged to the bottom side of the concave groove by the urging means, and the slider is also constantly urged to the spacer side with this,
Even if there is some wear between the engaging portion of the spacer and the engaged portion of the slider, cutting can be continued while suppressing rattling of the slider, extending tool life and requiring maintenance. Labor can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a front view of the embodiment shown in FIG.

FIG. 3 is a sectional view taken along line XX of the embodiment shown in FIG.

FIG. 4 shows the cutting edge tips 5A, 5B, 5 of the embodiment shown in FIG.
It is a rotation locus about the axis O of C.

FIG. 5 is a sectional view showing a conventional cutting tool.

FIG. 6 is a sectional view of the conventional example shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tool main body 5A, 5B, 5C Cutting edge chip 11 Concave groove 11a, 11b Wall surface of concave groove 11c Bottom of concave groove 11 Spacer 12a Serration groove (engagement part) 13 Wedge member 15 Clamp bolt (adjustment bolt) 16 Slider 16a Serration groove (engaged part) 17 biasing means 19 disc spring (spring member) 20 insertion hole

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shoji Takiguchi 1511 Furamaki, Ishishita-cho, Yuki-gun, Ibaraki Prefecture Inside the Tsukuba Works, Mitsubishi Materials Corporation (72) Inventor Akira Venus 1511 Furimagi, Ishishita-cho, Yuki-gun, Ibaraki Prefecture (56) References JP-A-6-315810 (JP, A) JP-A-6-320318 (JP, A) US Patent 5048441 (US, A) US Patent 2896308 (US, A)

Claims (3)

(57) [Claims] 1. A substantially conical tool body rotated about an axis is formed with a concave groove along a generatrix of the cone, and a slider provided with a cutting edge tip is provided in the concave groove. Along with being slidably mounted along the tool main body, the tool main body is rotatable integrally with the tool main body, and is movable forward and backward along the axis, and engages with the slider to engage the slider. A cutting tool including a coupling member to be slid therein, wherein a pair of opposed wall surfaces of the concave groove extends between the one wall surface and the slider in the direction of the generatrix. A spacer having a mating portion is detachably interposed, and an engaged portion that engages with the engaging portion is formed on one side surface of the slider that is brought into contact with the spacer. The other of the pair of walls A wedge member, which is pressed into the bottom surface of the concave groove and presses the slider toward the one wall surface to engage the engaging portion and the engaged portion, is attached to and detached from the slider. A cutting tool, which is freely interposed and provided with an urging means for urging the wedge member toward the bottom surface of the concave groove. 2. An adjusting bolt which penetrates through the wedge member and is screwed into a screw hole formed in a bottom surface of the concave groove, and a head of the adjusting bolt and the wedge member. 2. The cutting tool according to claim 1, further comprising a spring member interposed therebetween to press the wedge member toward the bottom surface of the concave groove. 3. The cutting tool according to claim 1, wherein the engaging portion and the engaged portion are serration grooves extending along the direction of the generatrix.