JPH10296516A - Throw-away tip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a throw-away tip which can prevent the forming of a flat plane by generation of core or shavings by controlling the moving of a cutting edge in the radial direction inside of a tool main body, even when the outer diameter of the cutting edge is enlarged, when it is used in a throw-away type drill or a ball-end mill in which the diameter of the cutting edge can be adjusted. SOLUTION: In a throw-away tip, the upper surface of a flat tip body 1 is made to be a scooping surface and the lower surface is made to be a seating surface, and a cutting edge 3 is formed on the edge of the cutting face. A contact surface 8 of an arc shape which can come in contact with the wall 26 of a tip mount 24 formed in a tool body 21, is formed on the side of the tip body 1, and the position of the cutting edge 3 to the tool body 21 can be adjusted by sliding the tip body 1 on the wall 26 along the arc made by the contact surface 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throw-away tip (hereinafter, referred to as a tip) which is detachably mounted on a tool body of a throw-away type cutting tool such as a throw-away drill, reamer or end mill. Things.

[0002]

2. Description of the Related Art As a throw-away type cutting tool of this type, for example, one or a plurality of tip mounting seats are formed at the tip of a cylindrical tool body which is rotated around an axis, and these tip mounting seats are cut. There are known throw-away type drills and reamers to which tips having blades are mounted, and throw-away type end mills such as ball end mills. And in the case of a throw-away type drill or reamer, the tool body is sent out in the axial direction while being rotated around its axis, thereby drilling holes in the work material by the cutting blade formed on the tip. In the case of a throw-away type end mill,
The tool body is sent out in a direction intersecting with the axis while being rotated about the axis, whereby the work material is subjected to groove processing by the cutting blade.

[0003]

In the case of such a throw-away type cutting tool, when the diameter of a hole to be machined in drilling or the width of a groove to be machined in grooving is to be finely adjusted or changed, a general method is used. In essence, the cutting tool itself must be replaced with one with a different rotating diameter (the outer diameter of the cutting blade) around the axis of the cutting blade, and therefore multiple types of cutting tools must be prepared, which is inefficient. And it was uneconomical. Therefore, in order to solve such a problem, for example, there have been conventionally proposed various throw-away type cutting tools in which a tip moving means for moving a tip in a radial direction of a tool body and an outer diameter of a cutting blade can be adjusted are provided. ing.

However, such a cutting tool has a structure in which the insert is exclusively moved in parallel in the radial direction. Therefore, a throw-away type reamer or the like in which only a portion of the insert located on the outer peripheral side of the tool body is not used for cutting is used. Still,
In the case of indexable drills and end mills where the inner peripheral part is also used for cutting, if the insert is moved in parallel to the outer peripheral side of the tool body in order to increase the outer diameter of the cutting edge, this amount of movement will be reduced. However, the inner peripheral end of the cutting edge also moves to the outer peripheral side, and there is a problem that a portion where the cutting edge does not exist on the inner peripheral side of the tool body occurs. In such a cutting tool, for example, in the case of a throw-away type drill, a core that is left uncut is generated at the center of a processing hole formed in a work material, and thus a mechanism for removing such a core is provided. It can only be applied to drills, and in the case of throw-away type end mills, especially ball end mills, a flat surface is also formed by the uncut portion at the center of the bottom of the groove formed in the work material. However, in the tip moving means as described above, the types of applicable tools must be limited.

The present invention has been made under such a background, and particularly when used in a throw-away type drill or a ball end mill in which the outer diameter of the cutting blade is adjustable, the outer diameter of the cutting blade is reduced. The present invention provides a tip that can suppress the movement of the cutting edge in the radial direction on the inner peripheral side of the tool body even when the diameter of the tool body is increased, and can prevent the generation of a core and the formation of a flat surface due to uncut portions. The purpose is.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve the above object, the present invention provides a flat chip-shaped chip body in which the upper surface is a rake surface and the lower surface is a seat surface. In a chip having a cutting edge formed on a side ridge of the rake face, an arc-shaped contact surface which can be in contact with a wall surface of a chip mounting seat formed on a tool body on a side surface of the chip body. The tip body slides on the wall surface along the arc formed by the contact surface, whereby the position of the cutting blade with respect to the tool body can be adjusted. However, when such a tip is mounted on a tip mounting seat formed at the tip of a tool body of a throw-away type drill or a ball end mill, the tip body is moved along the arc in order to increase the outer diameter of the cutting blade. When the tip body is moved to the outer circumference of the tool body, the portion of the tip body located on the outer circumference of the tool body mainly moves to the outer circumference as it is, whereas the portion of the tip body located on the inner circumference of the tool body is mainly the tool body. Moving back to the rear end side, so that the amount of movement of the inner peripheral end relative to the amount of movement of the outer peripheral end of the cutting blade can be reduced, and therefore, the presence of the cutting edge on the inner peripheral side of the tool body It is possible to prevent the occurrence of a part that does not work.

Here, as described above, when the tip body is slid along the arc formed by the contact surface of the tip body, the cutting edge with respect to the tool body is expanded and contracted so that the outer diameter of the cutting edge expands and contracts. In order to make the position adjustable, for example, the radius of the arc formed by the contact surface may be set to be larger than the radius of the circle inscribed in the rake surface. Further, when a mounting hole through which a clamp screw for fixing the chip main body to the chip mounting seat is inserted is formed in the chip main body, an inner wall portion of the mounting hole is concentric with an arc formed by the contact surface. If it is formed in the shape of an arc surface, regardless of the slide position of the chip along the arc surface, the gap between the clamp screw and the wall surface of the chip mounting seat is in contact with the contact surface of the chip body. Since the thickness between the mounting hole and the inner wall portion is constant, it is possible to securely hold the chip and secure the mounting rigidity. Further, the outer diameter of the cutting blade can be adjusted more easily and accurately by forming an engaging portion on the side surface of the tip body with which the adjusting means for sliding the tip body engages. Become.

[0008]

1 and 2 show one embodiment of the present invention, and FIGS. 3 to 6 show a throw-away type drill to which a tip of this embodiment is mounted. is there. The chip of the present embodiment is a positive chip in which the chip body 1 is formed of a hard material such as a cemented carbide or the like and has a rhombic flat plate shape. The cutting edge 3 is formed on the cutting surface 2, and a surface opposite to the rake surface 2 is a seating surface 4. A pair of acute ends of the rhomboid surface, which is the rake face 2, is formed in an arc shape that smoothly contacts the cutting edge 3 that intersects these acute ends, and the nose radius portion of the cutting edge 3. 5 is set.

The side surface 6 of the chip body 1 between the rake face 2 and the seating face 4 is directed toward the seating face 4 with the portion on the rake face 2 serving as the flank 7 of the cutting blade 3. 2, the side surface portion on the seating surface 4 side is the contact surface 8 in the present embodiment, and as shown in FIG. It is formed in a direction perpendicular to the seating surface 4. Further, as shown in FIG. 1, the contact surface 8 is flattened in a perspective view from the rake surface 2 side with a straight line connecting the pair of nose round portions 5 and 5 of the rake surface 2 as a long axis L. This flat circle has a portion extending in the direction of the long axis L and a convex arc having a radius R larger than the radius of the circle C inscribed in the rhombus formed by the rake face 2. In this case, the contact surface 8 is formed as a part of a cylindrical surface orthogonal to the seating surface 4. The two ends of the contact surface 8 in the direction of the long axis L where the pair of cylindrical surfaces intersect are formed so as to smoothly contact the cylindrical surface having a small radius.

A mounting hole 9 is formed in the chip body 1 so as to penetrate the chip body 1 from the center of the rake face 2 to the seating surface 4 vertically. As shown in FIG. 1 when viewed from the rake face 2 side, this mounting hole 9
It has a flat circular shape similar to the flat circle formed by the abutting surface 8 and extends in the long axis L direction. The radius R of the cylindrical surface which is coaxial with the cylindrical surface and which the contact surface 8 forms
It is formed in a cylindrical shape with a smaller radius r. The portion of the mounting hole 9 on the rake face 2 side is formed in a tapered cross section whose diameter gradually increases toward the rake face 2 side. Further, the contact surface 8 has a concave portion 1 having a V-shaped cross section in a perspective view from the rake face 2 side, in the middle of the cylindrical surface portion having a radius R extending in the long axis L direction.
When the tip of this embodiment is mounted on the throw-away drill and the outer diameter of the cutting edge 3 is adjusted, the adjusting means on the drill side serves as an engaging portion to be engaged. .

The above-described indexable drill to which the insert according to the present embodiment is mounted has a tool body 21 having a substantially cylindrical shape with the axis O as the center.
A pair of chip discharge grooves 22, 22 extending from the front end to the rear end side of the tool main body 21 are formed symmetrically about the axis O on the outer peripheral portion. Tip mounting seats 24 are formed at the tip portions of the wall surfaces 23 facing the tool rotation direction T of the chip discharge grooves 22 and 22, respectively.
The chip main body 1 having the above-described structure is mounted on the chip mounting seat 24.

The tip mounting seat 24 has a flat bottom surface 25 that is recessed one step backward from the wall surface 23 of the chip discharge groove 22 in the tool rotation direction T, and rises vertically from the rear end of the bottom surface 25. The tool body 21 is defined by a wall surface 26 facing the front side connected to the wall surface 23, and is open to the front end surface and the outer peripheral surface of the tool body 21 and the chip discharge groove 22. The wall surface 26 of the tip mounting seat 24 is formed in a concave cylindrical surface having a radius R centered on an axis X which is outside the tool main body 21 and is orthogonal to an extension surface of the bottom surface 25 on the distal end outer peripheral side. That is, when viewed from the direction facing the bottom surface 25, the distal end of the tool main body 21 extends from the inner peripheral side of the distal end toward the outer peripheral side of the rear end while being concavely bent toward the rear end inner peripheral side of the tool main body 21. The contact surface 8 of the chip body 1 is formed in a concave arcuate shape so as to be in close contact with the contact surface. The height of the wall surface 26 from the bottom surface 25 of the chip mounting seat 24 is slightly smaller than the width of the contact surface 8 from the seating surface 4 of the chip body 1 as shown in FIG.

An adjusting screw hole 28 is formed in the tool body 21 so as to open from a wall surface 27 of the chip discharge groove 22 facing the rear side in the tool rotation direction T to the wall surface 26 of the chip mounting seat 24. I have. This adjustment screw hole 28 is
As seen from the direction perpendicular to the bottom surface 25 of the tip mounting seat 24, as shown in the figure, the tip is formed in a direction oblique to the concave arc formed by the wall surface 26 toward the outer peripheral side of the tool body 21 toward the wall surface 26 side. The adjusting screw hole 28 is provided with an adjusting screw 29 as adjusting means provided on the tool body 21 side.
Is screwed into and out of the wall surface 26. Further, a clamp screw hole 31 into which a clamp screw 30 for clamping the chip main body 1 is screwed is formed in the bottom surface 25 of the chip mounting seat 24 in a substantially central portion of the bottom surface 25. The outer peripheral surface of the head of the clamp screw 30 is formed in a tapered shape whose diameter increases as the distance from the screw portion at the tip of the clamp screw 30 increases, as shown in FIG.

In the tool body 21 of the throw-away type drill configured as described above, the tip of the present embodiment has the rake face 2 of the tip body 1 oriented in the tool rotation direction T and intersects each other at an obtuse angle. The pair of cutting blades 3 and 3 are projected from the tip of the tool body 1, and the seating surface 4 and the abutment surface 8 are brought into close contact with the bottom surface 25 and the wall surface 26 of the chip mounting seat 24, respectively. To be seated. Therefore, in the chip body 1, the center of the arc formed by the contact surface 8 is set to the wall surface 26 of the chip mounting seat 24.
And is seated on the chip mounting seat 24 so as to coincide with the axis X of the concave circular arc formed by the shaft. Then, as shown in FIG. 5, the clamp screw 30 is inserted into the mounting hole 9 of the chip body 1 and screwed into the clamp screw hole 31 so that the tapered outer peripheral surface of the head of the clamp screw 30 is formed. Rake face 2 formed in a tapered shape of mounting hole 9
Then, the chip body 1 is pressed against the bottom surface 25 side and the wall surface 26 side of the chip mounting seat 24, is mounted on the chip mounting seat 24, and is fixed to the tool main body 21.

Further, when the outer diameter of the cutting blade 3 is adjusted by moving the tip body 1 mounted on the tip mounting seat 24, for example, to increase the outer diameter, slightly loosen the clamp screw 30. The tip body 1 to the tip mounting seat 24
Then, the adjustment screw 29 may be screwed in and made to protrude from the wall surface 26 after being slidable along the wall surface 26. As a result, in the chip body 1, the concave portion 11 formed on the contact surface 8 is pressed against the tip of the adjusting screw 29, so that the convex arc-shaped contact surface 8 is formed on the concave arc-shaped wall surface 26. The nose radius portion 5 of the cutting blade 3 located on the outer peripheral side of the tool main body 21 is moved along the wall surface 26 while being in close contact with the outer peripheral side of the tool main body 21 as shown in FIG. the outer diameter of the cutting edge 3 moves is then expanded to D ₂ from D ₁ to. In order to reduce the outer diameter of the cutting blade 3, the clamp screw 30 is loosened and the adjusting screw 29 is retracted,
The chip body 1 may be slid inward along the wall surface 26 so that the recess 11 abuts on the tip of the adjusting screw 29.

However, in the tip of the present embodiment, when the tip body 1 is moved relative to the tool body 21 in order to adjust the outer diameter of the cutting blade 3 in this manner, the tip mounting seat 24
Since the contact surface 8 contacting the wall surface 26 of the tool body 21 has an arc shape, the contact surface 8 is arranged so as to extend from the inner peripheral side of the front end of the tool body 21 to the outer peripheral side of the rear end. When, for example, the outer diameter of the cutting edge 3 is increased by moving the tip main body 1 along the nose, the nose radius portion of the cutting edge 3 located on the outer peripheral side of the tool main body 21 as shown in FIG. 5 moves mainly to the outer peripheral side as it is, whereas the nose round portion 5 on the inner peripheral side moves mainly to retreat to the rear end side of the tool body 21. And with this,
While the outer diameter D of the cutting edge 3 greatly increases from D ₁ to D ₂ , the position of the nose round portion 5 on the inner peripheral side of the tool body 21 in the radial direction with respect to the axis O hardly changes. That is, the inner diameter of the cutting edge 3 around the axis O expands only from d ₁ to d _{2 as} shown in FIG.

For this reason, in a throw-away type cutting tool such as the above-mentioned drill equipped with the insert of the present embodiment,
Although the outer diameter of the cutting blade 3 can be adjusted within a relatively large range, a portion where the cutting blade 3 does not exist is formed on the inner peripheral side of the tool body 21 due to such an increase in the outer diameter of the cutting blade 3. For example, in the case of a drill, it is possible to prevent a situation in which a core is left at the center of a drilled hole during drilling, and a structure that removes such a core can be prevented. For example, there is no need to adopt a structure in which a recess for accommodating and discharging the core is provided at the center of the distal end surface of the tool body 21. In addition, even when the outer diameter of the cutting edge 3 is increased in this way, since the change in the inner diameter of the cutting edge 3 is small, the cutting form of the cutting edge 3 particularly on the inner peripheral side of the tool body 21 also changes. When the outer diameter of the cutting edge 3 is enlarged or reduced, the cutting resistance and the amount of wear acting on the cutting edge 3 on the inner peripheral side are remarkably fluctuated, which hinders stable machining. Can be prevented beforehand.

Here, as described above, when the tip body 1 is slid along the arc formed by the contact surface 8 of the tip body 1, the outer diameter of the cutting blade 3 is increased or decreased. In order to adjust the position of the cutting edge 3 with respect to 21, the radius R of the arc formed by the contact surface 8 is larger than the radius of the circle C inscribed on the rake surface 2 of the tip body 1 as in the present embodiment. You may set it large. That is, if the radius R of the arc formed by the contact surface 8 is smaller than the radius of the inscribed circle C, the tip body 1 is moved along the arc.
Only rotates around the center of the rake face 2, and as described above, there is a possibility that it becomes impossible to increase only the outer diameter while maintaining the inner diameter of the cutting blade 3.

On the other hand, in the chip of the present embodiment, the inner wall portion 10 of the mounting hole 9 formed in the chip body 1 is concentric with the arc formed by the contact surface 8 and has a radius r smaller than the radius R of the arc. Thus, a portion between the contact surface 8 of the chip body 1 and the inner wall portion 10 is formed in a circular arc shape having a uniform thickness. The chip body 1 is mounted by the head of the clamp screw 30 by screwing the clamp screw 30 inserted into the mounting hole 9 into a clamp screw hole 31 formed on the bottom surface 25 of the chip mounting seat 24. The tapered portion of the hole 9 on the rake face 2 side is pressed and pressed against the bottom surface 25 and the wall surface 26 of the chip mounting seat 24, so that the hole 9 is always fixed in a fixed state regardless of its position. . Therefore, according to the present embodiment, the rigidity of attachment of the tip body 1 to the tool body 21 can be reliably ensured, and the attachment of the tip body 1 is unstable due to the movement of the tip accompanying the adjustment of the outer diameter of the cutting blade 3. Can be prevented.

In this embodiment, a recess 11 is formed in the contact surface 8 of the side surface 6 of the chip body 1, and the recess 11 is formed on the tool body 21 side for sliding the chip body 1. The distal end of the provided adjustment screw (adjustment means) 29 forms an engagement portion that abuts and engages. When the outer diameter D of the cutting blade 3 is to be enlarged, for example, the clamp screw 30 is loosened and the adjustment screw 29 is projected as described above, so that the tip of the adjustment screw 29 is engaged with the concave portion 11. The tip main body 1 is moved along the contact surface 8, and the amount of movement at this time corresponds to a component in the tangential direction with respect to the circular arc surface, of the protrusion amount due to the screwing of the adjusting screw 29. Therefore, according to the present embodiment, not only can the tip body 1 be easily moved by the operation of the adjusting means, that is, the screwing of the adjustment screw 29, but also the positioning and cutting of the chip body 1 according to the amount of screwing. The outer diameter of the blade 3 can be adjusted with a high degree of accuracy, thereby improving the processing accuracy.

In the indexable cutting tool such as the drill equipped with the tip of the present embodiment, the wall surface 26 of the tip mounting seat 24 against which the contact surface 8 of the tip body 1 abuts. The chip body 1 is formed in a concave arc shape having the same radius R as the contact surface 8, and the chip body 1 is moved such that the contact surface 8 is guided by the wall surface 26 in a state of being in close contact with the wall surface 26. Therefore, according to such a throw-away type cutting tool, the outer diameter of the cutting blade 3 can be adjusted more easily and accurately, and regardless of the mounting position of the tip body 1 thus moved, the above-mentioned circular arc-shaped cutting tool can be used. Since the contact state between the contact surface 8 and the wall surface 26 is maintained, the chip can be moved and the contact area between the chip main body 1 and the chip mounting seat 24 is sufficiently ensured with a relatively simple structure. Thus, the mounting rigidity can be further improved.

In the above description, the case where the insert according to the embodiment of the present invention is mounted on a throw-away type drill has been described. Of course, it is also possible to attach. Further, the insert of the present invention is not limited to the one mounted on such a throw-away type hole processing tool, and can be applied to, for example, the one mounted on a groove processing tool such as a throw-away type end mill. is there. Here, in the above embodiment, the side surface 6 of the chip body 1 is
As shown in FIG. 5, the flank 7 of the cutting edge 3 on the rake face 2 and the contact portion 8 on the seating surface 4 side are formed in two steps. When the present invention is applied to a tip mounted on a throw-away type ball end mill that forms a groove having a bottom surface with an arc-shaped cross section in a material, the tip is formed such that the cutting edge forms an arc in such a throw-away type ball end mill. Often, the entire side surface is formed as a convex arc surface, so that the flank of the cutting edge and the contact surface that abuts on the chip mounting seat wall surface can be formed as the same convex arc surface, facilitating chip manufacturing. And the strength can be improved.

Further, in the above embodiment, the contact surface 8 of the chip body 1 is formed into a convex cylindrical surface having a radius R,
The contact surface 8 is brought into close contact with the concave cylindrical wall surface 26 of the tip mounting seat 24 formed on the tool body 21. For example, the contact surface 8 is replaced with the rake face 2.
From the side toward the seating surface 4 side, the wall surface 26 of the tip mounting seat 24 is formed along the axis X side toward the bottom surface 25 with the axis X as the center. You may make it form in the shape of an inclined concave conical surface. In the above embodiment, the chip body 1
The engaging portion formed on the side surface 6 is a recess 11 to which the tip of the adjusting screw 29 can be brought into contact. The tip body 1 is moved to the outer peripheral side of the tool body 21 so as to increase the outer diameter of the tool.
When the convex portion is formed annularly on the outer peripheral surface of the tip, a convex portion that can be engaged with the convex portion is formed in the concave portion 11 of the chip main body 1. Also, when the outer diameter of the cutting blade 3 is reduced by operating the adjusting screw 29 by engaging the engaging portion of the tip body 1 with the adjusting screw 29, the tip can be moved to the inner peripheral side of the tool body 21. can do.

Further, in the above-described embodiment, the case where the present invention is applied to a chip having the rhombus-shaped flat chip body 1 and the cutting blades 3... Formed in a straight line has been described. The present invention can also be applied to a chip in which the cutting edge 3 is bent in a multi-step shape, as in another embodiment of the present invention shown in FIGS. Here, in the tip of the embodiment shown in FIG. 7, while the cutting edge 3 is separated from the nose
In the chip of the embodiment shown in FIG. 8, the cutting edge 3 is in the middle of being separated from the nose round portion 5 in a stepped shape so as to be recessed one step inside the chip body 1 in a plan view from a direction facing the cutting edge 3. On the contrary, it is formed stepwise so as to protrude one step outside the chip body 1. However, in such a chip in which the cutting blades 3 are formed in a multi-step shape, the chips are cut and generated in advance at these steps, so that there is an advantage that the chip processing performance can be improved. Can be

The present invention is not limited to the diamond-shaped flat chip, but is applied to a triangular flat chip as shown in FIG. 9 and a barrel-shaped hexagonal flat chip as shown in FIG. It is also possible to apply to chips of other various shapes. In the embodiments shown in FIGS. 7 to 10, the same reference numerals are given to the same parts as those in the embodiment shown in FIGS. 1 and 2, and the description is omitted. In the embodiments shown in FIGS. 7 to 10, a groove-shaped chip breaker 3 is formed on the rake face 2 of the chip body 1 along the cutting edge 3.
2 are formed. However, the present invention is not limited to the presence or absence of such a chip breaker. In the embodiment shown in FIGS. 7 to 10, the above-described chip breaker 32 is not provided, or another type of chip breaker is used. 1 and 2, and in the embodiment shown in FIGS.
Alternatively, a chip breaker of another type may be provided.

[0026]

As described above, according to the present invention,
Since the arc-shaped contact surface formed on the chip body is brought into contact with the wall surface of the chip mounting seat, and the chip can be moved along the arc formed by the contact surface, the wall surface of the chip mounting seat can be moved. Is formed so as to extend from the inner peripheral side of the front end to the outer peripheral side of the rear end of the tool main body, the amount of movement of the inner peripheral end relative to the amount of movement of the outer peripheral end of the cutting blade can be reduced. For this reason, by mounting the insert of the present invention on a throw-away type drill, a ball end mill, or the like, even when the outer diameter of the cutting edge is enlarged, a portion where the cutting edge does not exist on the inner peripheral side of the tool body is generated. It is possible to prevent a core or a flat surface from being left uncut by a portion where such a cutting edge is not formed on a work material.

[Brief description of the drawings]

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

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

FIG. 3 is a side view of a distal end portion of a throw-away drill to which the throw-away tip of the embodiment shown in FIG. 1 is attached.

FIG. 4 is a front view of the indexable drill shown in FIG. 3;

FIG. 5 is a sectional view taken along the line ZZ in FIG. 3;

6 is a view showing a state in which the outer diameter of the cutting blade 3 is adjusted by moving the throw away tip in the throw away type drill shown in FIG.

FIG. 7 is a plan view showing another embodiment of the present invention.

FIG. 8 is a plan view showing another embodiment of the present invention.

FIG. 9 is a plan view showing another embodiment of the present invention.

FIG. 10 is a plan view showing another embodiment of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 chip main body 2 rake face 3 cutting edge 4 seating surface 8 abutment surface 9 mounting hole 10 wall surface of mounting hole 9 concave portion (engaging portion) 21 tool body 24 chip mounting seat 25 bottom surface of chip mounting seat 24 26 chip mounting Wall surface of seat 24 29 Adjusting screw (adjusting means) 30 Clamp screw O Axis line of tool main body X Center of arc surface formed by wall surface 25 R Radius of arc surface formed by contact surface 8 and wall surface 25 r Inner wall of mounting hole 9 radius D ₁ of the arcuate surface of 10 forms, D ₂ the inner diameter T tool rotation direction of the outer diameter d _1, d ₂ cutting edges 3 of the cutting edge 3

Claims (4)

[Claims] 1. A throw-away insert comprising a flat chip body having an upper surface formed as a rake surface and a lower surface formed as a seating surface, and a cutting edge formed at a side edge of the rake surface. On the side surface, an arc-shaped abutting surface that can abut against the wall surface of the tip mounting seat formed on the tool body is formed, and the tip body extends along the arc formed by the abutting surface. Characterized in that the position of the cutting edge with respect to the tool body can be adjusted by sliding the insert. 2. The indexable insert according to claim 1, wherein a radius of an arc formed by the contact surface is set to be larger than a radius of a circle inscribed in the rake surface. 3. The chip body has a mounting hole through which a clamp screw for fixing the chip body to the chip mounting seat is inserted, and an inner wall portion of the mounting hole is formed on the contact surface. 3. The indexable insert according to claim 1, wherein the indexable insert is formed in a shape of an arc concentric with an arc formed by the insert. 4. The chip body according to claim 1, further comprising an engaging portion formed on a side surface of said chip main body for engaging an adjusting means for sliding said chip main body.
The throwaway tip according to any one of the above.