JP2023148483A - Cutting edge replaceable cutting tool - Google Patents

Abstract

To provide a cutting edge replaceable cutting tool capable of simply and effectively removing chips from a mounting seat.SOLUTION: A cutting edge replaceable cutting tool is equipped with a holder that has a cutting insert, a mounting portion having an insert mounting seat attached with the cutting insert, and a fluid supply channel for supplying fluid to the mounting portion. The insert mounting seat has a first restraining surface that restrains a seating surface of the cutting insert, a second restraining surface that intersects the first restraining surface and restrains a side surface of the cutting insert, a third restraining surface that intersects the first restraining surface and the second restraining surface, and a relief portion located between the second restraining surface and the third restraining surface. The fluid supply channel has an outlet that communicates with the mounting portion and opens toward the first restraining surface.SELECTED DRAWING: Figure 1

Description

The present invention relates to an indexable cutting tool.

When cutting a workpiece using an indexable cutting tool, chips are generated. After use, some of the chips may accumulate between the cutting insert and the tool body. If chips get caught between the new cutting insert and the tool body when replacing the cutting insert, the seating surface of the cutting insert and the restraining surface of the tool body will be damaged. To prevent this, it is necessary to remove chips from the insert pocket (attachment part) of the tool body before installing a new cutting insert.

Conventionally, an operator blows compressed air or the like from outside the cutting tool toward the restraint surface to blow away the chips and remove them.

Special table 2019-526458 publication Japanese Patent Application Publication No. 2010-105084

However, in the above case, because compressed air was blown from the direction opposite to the restraining surface of the insert pocket that restrains the seating surface of the cutting insert, chips (for example, fine chips) could accumulate in the corners of the insert pocket. There was a problem in that chips could not be effectively removed from the insert pocket. Furthermore, in order to effectively remove chips from the insert pocket, compressed air must be blown onto the insert pocket from all directions, which is time-consuming.
Therefore, in this type of indexable cutting tool, a configuration is desired that allows chips to be easily and effectively removed from the insert pocket (on the restraining surface).

One of the objects of the present invention is to provide an indexable cutting tool that can efficiently remove chips from an insert pocket (on a restraining surface).

One aspect of the present invention includes a holder having a cutting insert, a mounting portion having an insert mounting seat to which the cutting insert is mounted, and a fluid supply channel for supplying fluid to the mounting portion. , the insert mounting seat includes a first restraint surface that restrains a seating surface of the cutting insert, a second restraint surface that intersects the first restraint surface and restrains a side surface of the cutting insert, and the first restraint surface. and a third restraint surface that intersects the second restraint surface, and the fluid supply channel has an outlet that communicates with the attachment part and opens toward the first restraint surface.

According to the present invention, even if chips generated during cutting remain on the insert mounting seat after use, fluid is supplied to the insert mounting seat through the fluid supply channel formed inside the holder. By doing so, it is possible to efficiently remove chips within the mounting portion (for example, on the first restraining surface) toward the outside of the holder.

The indexable cutting tool may further include a relief portion located between the second constraint surface and the third constraint surface, and the outlet of the fluid supply channel may be connected to the second constraint surface and the third constraint surface. It may be configured to open toward at least one side of the third restraining surface.

In this case, the fluid can be supplied intensively in the direction toward which the outlet faces, so that it is possible to improve the evacuation of chips.

Further, in the above indexable cutting tool, the outlet of the fluid supply channel opens in the relief portion formed at a corner where the first restraining surface, the second restraining surface, and the third restraining surface intersect. A configuration may also be used.

In this case, by forming the outlet of the fluid supply flow path in the corner formed at the corner where the three restraining surfaces intersect, chips can be efficiently removed from the relief part toward the outside of the holder. can. By supplying fluid from the relief part side, it is possible to suppress chips from remaining in the relief part surrounded on three sides.

Further, in the indexable cutting tool, at least a portion of the opening area of the outlet may overlap with the first restraining surface when viewed from a direction along the center line of the outlet.

In this case, chips remaining on the first restraining surface can be efficiently removed.

Further, in the indexable cutting tool, the fluid supply flow path may have a plurality of outlets for one attachment portion.

In this case, by having a plurality of outlets, gas can be supplied in a plurality of directions, so that chips dispersed within the insert mounting seat can be efficiently discharged in a short time.

Further, in the above-mentioned indexable cutting tool, the inlet of the fluid supply channel may be configured to open at an outer circumferential surface of the holder or at a proximal end surface on the opposite side in the length direction from the mounting section.

In this case, work can be done from the proximal end of the holder. Furthermore, since the flow path can be extended without being curved, the structure is simple and the flow path can be easily formed.

According to the indexable cutting tool of the above aspect of the present invention, it is possible to stably attach the cutting insert to the holder by efficiently removing chips from inside the insert pocket.

FIG. 1 is a perspective view showing the configuration of an indexable cutting tool according to a first embodiment. FIG. 2 is a perspective view showing the configuration of the holder of the indexable cutting tool in the first embodiment. FIG. 3 is a partially enlarged perspective view showing the periphery of the insert pocket of the holder in the first embodiment. FIG. 4 is a perspective view showing the fluid supply channel of the holder in the first embodiment. FIG. 5 is a diagram of the holder in the first embodiment viewed from the first restraining surface side. FIG. 6 is a side view of the holder in the first embodiment viewed from the side facing the second restraint surface. FIG. 7 is a perspective view showing the configuration of a holder in Modification 1. FIG. 8 is a perspective view showing the structure of the holder in Modification 2. FIG. 9 is a perspective view showing the configuration of a holder to which the fluid supply channel according to the present invention can be applied. FIG. 10 is a perspective view showing the configuration of an indexable cutting tool according to the second embodiment. FIG. 11 is a perspective view showing the configuration of a holder in the indexable cutting tool of the second embodiment.

Hereinafter, an indexable cutting tool according to the present invention will be described with reference to the drawings.
In each drawing, the direction along the first restraining surface of the holder is the X direction, the length direction of the holder is the Y direction, and the direction intersecting the X and Y directions is the Z direction.

<First embodiment>
An indexable cutting tool 1 according to a first embodiment of the present invention will be described with reference to the drawings. The indexable cutting tool 1 of the present embodiment is an indexable turning tool such as an indexable cutting tool used for turning, and can be detachably attached to a tool rest of a machine tool such as a lathe (not shown). be done. In addition, in this embodiment, the indexable cutting tool 1 may be simply called a cutting tool, a tool, or the like.

FIG. 1 is a perspective view showing the configuration of an indexable cutting tool 1 according to the first embodiment.
As shown in FIG. 1, the indexable cutting tool 1 includes a holder 10 and a cutting insert 20 attached to the holder 10. In this embodiment, one cutting insert 20 is detachably attached to the holder 10.

The holder 10 is made of a metal material such as steel and has a cylindrical shape, for example. The holder 10 has a length along the central axis O, and the base end side (-Y direction) in the axial direction (Y direction) is attached to the main shaft of the machine tool. The holder 10 has an insert pocket (attachment part) 11 on the distal end side in the axial direction (+Y direction).

FIG. 2 is a perspective view showing the configuration of the holder 10 of the indexable cutting tool 1 in the first embodiment.
As shown in FIG. 2, the insert pocket 11 is formed by cutting out the outer circumferential surface 10a of the holder 10 on the distal end side. An insert mounting seat 12 is formed in the insert pocket 11. The insert mounting seat 12 is a pedestal on which the cutting insert 20 is mounted.

FIG. 3 is a partially enlarged perspective view showing the periphery of the insert pocket 11 of the holder 10 in the first embodiment.
As shown in FIG. 3, the insert mounting seat 12 includes a first restraint surface 12a, a second restraint surface 12b, and a third restraint surface 12c that can restrain the cutting insert 20, and wall surfaces 14b and 14c that do not contact the cutting insert 20. , relief portions 15a, 15b, 15c recessed relative to these wall surfaces 14b, 14c and the first restraining surface 12a.

The first restraining surface 12a is a surface facing one side around the axis of the holder 10. The first restraining surface 12a is a surface that restrains the seating surface 23 (FIG. 1) of the cutting insert 20, and is formed in a substantially square or diamond shape when viewed from one side around the central axis of the holder 10. The first restraining surface 12a has approximately the same area as the seating surface 23 of the cutting insert 20. A screw hole 13 into which the mounting screw 6 shown in FIG. 1 is inserted is formed in the center of the first restraining surface 12a.

The second restraint surface 12b and the wall surface 14b are located on the central axis O side of the first restraint surface 12a. The second restraint surface 12b and the wall surface 14b are surfaces that intersect the first restraint surface 12a and are along the central axis O. The second restraining surface 12b and the wall surface 14b face the outer peripheral side of the holder 10. The second restraint surface 12b is a surface that restrains the side surface 24 of the cutting insert 20. The wall surface 14b is located closer to the first restraint surface 12a than the second restraint surface 12b, and has substantially the same size as the second restraint surface 12b.

The third restraint surface 12c and the wall surface 14c are located on the axial base end side (-Y direction) of the first restraint surface 12a. The third restraint surface 12c and the wall surface 14c are surfaces that intersect the first restraint surface 12a and the second restraint surface 12b (wall surface 14b) and face toward the axial tip side (+Y direction). The wall surface 14c is located closer to the first restraint surface 12a than the third restraint surface 12c, and has substantially the same size as the third restraint surface 12c.
The side surface of the cutting insert 20 comes into contact with the second restraint surface 12b and the third restraint surface 12c.

The relief portion 15a is formed at a corner where the second restraint surface 12b and the wall surface 14b intersect with the third restraint surface 12c and the wall surface 14c. The relief portion 15a is formed with respect to the second restraint surface 12b and the wall surface 14b, and the third restraint surface 12c and the wall surface 14c so that the cross-sectional shape along the axial direction (Y direction) has a concave curve shape such as a concave circular arc. , in the radial direction of the screw hole 13, so as to be recessed in the direction away from the screw hole 13. The relief part 15a is formed into a concave shape by cutting out a large corner at the corner where the second restraint surface 12b and the wall surface 14b intersect with the third restraint surface 12c and the wall surface 14c. The escape portion 15a is formed in a part of a recess 16 that is cut out from the wall surface adjacent to the insert mounting seat 12 within the insert pocket 11 up to the insert pocket 11.

The relief portion 15a is formed at a corner where the first restraining surface 12a facing one side around the axis and the wall surface 14b facing the outer circumferential side intersect. The relief portion 15b is formed to be recessed with respect to the first restraining surface 12a and the wall surface 14b. The relief portion 15b extends in the direction in which the second restraining surface 12b and the wall surface 14b extend.

The escape portion 15c is formed at a corner where the first restraining surface 12a intersects with the wall surface 14c facing the axially distal end side. The relief portion 15c is formed to be recessed with respect to the first restraining surface 12a and the wall surface 14c. The relief portion 15c extends in the direction in which the third restraining surface 12c and the wall surface 14c extend.

FIG. 4 is a perspective view showing the fluid supply channel 18 of the holder 10 in the first embodiment. FIG. 5 is a diagram of the holder 10 in the first embodiment viewed from the side facing the first restraining surface 12a. FIG. 6 is a side view of the holder 10 in the first embodiment viewed from the side facing the second restraint surface 12b.

As shown in FIGS. 4, 5, and 6, a fluid supply flow path 18 is formed in the holder 10 of this embodiment.
The fluid supply channel 18 is formed to penetrate the inside of the holder 10 and communicates with the insert pocket 11 . The fluid supply channel 18 is a channel for supplying gas toward the insert mounting seat 12 in order to remove chips remaining on the insert mounting seat 12. In this embodiment, compressed air is supplied using, for example, an existing gas supply device.

Note that the type of gas to be supplied is not particularly limited, and the flow rate, pressure, specific gravity, temperature, viscosity, etc. of the gas to be supplied are appropriately set depending on the environment in which the tool is used, the type of work material, and the like. Moreover, it is not only gas that is supplied through the fluid supply flow path 18, but also a liquid such as a cutting fluid, for example.

The fluid supply channel 18 has a channel section 18A and a plurality of branch channel sections 18B.
The flow path portion 18A has an inlet 18a that opens to the outer peripheral surface of the holder 10 at one end in the length direction. A gas supply device is connected to this inlet 18a, and gas is supplied into the flow path section 18A. The inlet 18a opens into a groove 19 formed in a concave shape so as to be recessed from the outer circumferential surface 10a of the holder 10 toward the central axis O side.

The fluid supply channel 18 of this embodiment is branched into a plurality of parts at the other end in the length direction.
The plurality of branch flow path sections 18B are narrower than the flow path section 18A, and have smaller cross-sectional areas intersecting in the length direction than the flow path section 18A. The three branch flow path portions 18B extend while being curved in different directions, and all communicate with the insert pocket 11. In this embodiment, two branch flow path portions 18B open into the relief portion 15a of the insert mounting seat 12. The remaining one branch flow path portion 18B opens near the escape portion 15a of the recess 16 communicating with the insert pocket 11.

A plurality of outlets 18b1 and 18b2 of the fluid supply flow path 18 are opened in the relief portion 15a of the present embodiment in the insert mounting seat 12. The respective outlets 18b1 and 18b2 of these two branch flow path portions 18B are, for example, different in position and opening direction within the relief portion 15a. Each outlet 18b1, 18b2 opens toward the first restraint surface 12a, and when viewed from a direction along the center line (not shown) of each outlet 18b1, 18b2, at least a part of each opening area It is sufficient if it overlaps with the first restraint surface 12a. Thereby, chips remaining on the first restraining surface 12a can be efficiently removed.

Furthermore, it is more preferable that the first restraining surface 12a exists on each center line of each outlet 18b1, 18b2. That is, it is more preferable that each center line of each outlet 18b1, 18b2 intersects with the first restraining surface 12a.

The outlet 18b1 is formed on the side of the relief portion 15a closer to the first restraining surface 12a than the outlet 18b2. The outlet 18b1 is located in the vicinity of the intersection of the wall surface 14b and the wall surface 14c in the relief portion 15a.
The outlet 18b1 is open toward the second restraining surface 12b side. The outlet 18b1 of this embodiment opens, for example, toward the intersection of the first restraining surface 12a and the wall surface 14b. Thereby, it is possible to supply gas from the outlet 18b1 toward the region including the first restraining surface 12a and the relief portion 15b on the second restraining surface 12b side.

Further, the outlet 18b1 may be open toward the screw hole 13 formed at the center of the first restraining surface 12a, for example. In this case, the outlet 18b1 opens in the direction along the diagonal of the first restraining surface 12a. Thereby, it is possible to supply gas toward substantially the entire first restraining surface 12a.

The outlet 18b2 is formed on the side of the relief portion 15a that is further away from the first restraining surface 12a than the outlet 18b1. The outlet 18b2 is located in the escape portion 15a near the intersection of the second restraint surface 12b and the third restraint surface 12c. The outlet 18b2 is open toward the third restraining surface 12c. The outlet 18b2 of this embodiment opens, for example, toward the intersection of the first restraining surface 12a and the wall surface 14c. Thereby, it is possible to supply gas from the outlet 18b2 toward the region including the first restraining surface 12a on the third restraining surface 12c side and the relief portion 15c.

The outlet 18b3 opens into a recess 16 formed on the outside of the insert mounting seat 12 and on the outer side of the insert mounting seat 12 on the proximal end side in the axial direction. The outlet 18b3 is capable of supplying gas from the axial base end side of the insert pocket 11 toward the insert mounting seat 12. The outlet 18b3 can supply gas toward the outer peripheral side of the first restraining surface 12a. In addition, since the outlet 18b3 is formed in the recess 16 which is further away from the first restraint surface 12a in the normal direction (Z direction) than the exits 18b1 and 18b2 formed in the relief part 15a, the first restraint Gas can be easily supplied toward the peripheral edge of the surface 12a.
In this way, the directions in which gas is supplied by the three branch flow path sections 18B are different from each other.

As shown in FIG. 1, the cutting insert 20 has a square or diamond shape when viewed from the direction of the center axis of the insert. The cutting insert 20 is formed at a rake surface 22, a seating surface 23 opposite to the rake surface 22, a side surface 24 connecting the rake surface 22 and the seating surface 23, and an intersection ridgeline between the rake surface 22 and the seating surface 23. It has a cutting edge 25. The cutting insert 20 is accommodated in an insert pocket 11 formed on the distal end side of the holder 10, and is removably attached to the insert mounting seat 12.

According to the configuration of the present embodiment, compressed air supplied from the outside of the holder 10 is supplied to the insert mounting seat 12 using the fluid supply channel 18 formed inside the holder 10, thereby facilitating insert mounting. It is possible to remove chips remaining in the seat 12 regardless of their size. At least a portion of the gas supplied into the insert mounting seat 12 from the fluid supply channel 18 is discharged toward the first restraining surface 12a, so that it can effectively blow off chips on the first restraining surface 12a. can be removed. Since the evacuation of chips is improved, the time required for maintenance work can be shortened and the work load can be reduced, and the cutting insert 20 can be replaced efficiently.

Further, the outlet side (insert mounting seat 12 side) of the fluid supply flow path 18 described above is branched into a plurality of branches, and gas is supplied from each outlet 18b1, 18b2, 18b3 toward different directions inside the insert mounting seat 12. It is possible to supply. Therefore, for example, gas is supplied from the outlet 18b1 of the branch flow path section 18B toward the first restraining surface 12a and the escape section 15b, thereby causing the escape section 15b, that is, the intersection of the first restraining surface 12a and the wall surface 14b. It is also possible to actively discharge chips accumulated in the vicinity thereof toward the tip end in the axial direction.

Furthermore, for example, gas is supplied from the outlet 18b2 of the branch flow path section 18B toward the first restraining surface 12a and the escape section 15c, so that the escape section 15c, that is, the intersection of the first restraining surface 12a and the wall surface 14c It is also possible to actively discharge chips accumulated in the vicinity thereof to the outside in the radial direction of the holder 10. Further, for example, by supplying gas from the outlet 18b3 of the branch flow path section 18B toward the peripheral edge of the first restraining surface 12a, the gas is cut from above the first restraining surface 12a together with the gas supplied from the outlets 18b1 and 18b2. It is possible to push out the chips and remove them to the outside of the holder 10 more efficiently.

In this embodiment, two of the three outlets 18b1 and 18b2 of the fluid supply flow path 18 are formed in the relief portion 15a of the insert mounting seat 12. By forming at least one (two in this embodiment) outlet in the escape part 15a, it is possible to efficiently supply gas to the chips toward the outside of the holder 10 from the escape part 15a side. In addition, by supplying gas toward the outside of the holder 10 from the relief portion 15a side, the relief portion 15a is surrounded on three sides by intersecting the first restraining surface 12a, the second restraining surface 12b, and the third restraining surface 12c. It is possible to prevent chips from remaining on the surface.

Further, by forming a plurality of outlets in the relief portion 15a, it is possible to supply gas in different directions. By supplying gas in multiple directions from the relief portion 15a side toward the first restraining surface 12a, chips dispersed on the first restraining surface 12a can be efficiently removed, and the chips can be removed in a short time. It can be discharged efficiently.

In this embodiment, the angle of the center line of each outlet 18b1, 18b2, 18b3 with respect to the first restraint surface 12a is an acute angle of 90 degrees or less, and the gas smoothly flows to the outside of the holder 10 along the first restraint surface 12a. Flow to. Since it is possible to suppress the gas from flowing toward the second restraining surface 12b and the wall surface 14b, and the third restraining surface 12c and the wall surface 14c, even if it is a minute chip, each relief part 15a, 15b, 15c It is possible to prevent the particles from remaining on the first restraining surface 12a at or near the first restraining surface 12a.

By forming the fluid supply channel 18 inside the holder 10 in this manner, gas can be supplied from the insert mounting seat 12 to the outside of the holder 10, and chip evacuation can be improved. . This can prevent chips from getting caught between the cutting insert 20 and the insert mounting seat 12, so that the cutting insert 20 can be stably mounted in the correct position with respect to the insert mounting seat 12. , machining accuracy by the cutting insert 20 can be improved.

Furthermore, in this embodiment, gas can be supplied to the other side of the insert mounting seat 12 at once by simply connecting the gas supply device to the inlet 18a formed on the outer circumferential surface 10a of the holder 10. The cutting insert 20 can be replaced in a short time.

Note that the number of branch flow path sections 18B is not limited to three, and may be two or less, or four or more. Furthermore, when a plurality of branch flow path sections 18B are provided, it is preferable that the gas is supplied in a plurality of directions. That is, there may be a plurality of branch flow path sections 18B that supply gas in the same direction.

Further, the paths of the flow path section 18A and each branch flow path section 18B of the fluid supply flow path 18 are not limited to the illustrated paths, but can be changed as appropriate. For example, the inlet 18a of the flow path portion 18A may be open to the proximal end surface 10b of the holder 10 on the opposite side in the length direction (-Y direction) from the insert pocket 11. This makes it possible to work from the base end side (-Y direction) of the holder 10 in the axial direction. Furthermore, since the flow path can be extended without being curved, the structure is simplified and the flow path can be easily formed.

Moreover, it is preferable that each of the flow path portions 18A, 18B has a path whose shape changes gently.

Furthermore, although the opening shapes of the inlet 18a and the outlets 18b1, 18b2, and 18b3 of the fluid supply channel 18 in this embodiment are circular or elliptical, they are not limited to this, and can be appropriately changed to a polygonal shape or the like.

Further, in the present embodiment, the flow path diameter (cross-sectional area) of the flow path portion 18A is constant in the extending direction, but is not limited to this. It may be a shape. Similarly, in the branch flow path portion 18B, the flow path diameter is constant in the extending direction, but is not limited to this, and may have a shape in which the diameter gradually decreases or increases toward the outlet 18b, for example. Furthermore, although all three branch flow path portions 18B have the same flow path diameter, the present invention is not limited to this, and at least one branch flow path portion 18B may be different from the other branch flow path portions 18B, or the three branch flow path portions 18B may have the same flow path diameter. The flow path diameters of the branch flow path portions 18B may be different from each other. When varying the flow path diameter in the extending direction of the flow path portion, it is preferable to change the shape gently.

(Modification 1)
Next, the configuration of the holder 40 in Modification 1 will be described.
FIG. 7 is a perspective view showing the configuration of the holder 40 in Modification 1.
As shown in FIG. 7, the holder 40 of this modification has a fluid supply channel 48.
The fluid supply channel 48 is a channel whose outlet side is branched into two. The fluid supply channel 48 includes a first channel section 48A, a second channel section 48B connected to the distal end side of the first channel section 48A, and a second channel section 48B connected to the distal end side of the second channel section 48B. It has two branch flow path portions 48C. An inlet 48a of the fluid supply channel 48 opens to the outer circumference 40a of the holder 40, and two outlets 48b1 and 48b2 open to the relief part 15a.

In this modification, for example, the inlet 48a and the outlets 48b1, 48b2 each have a circular shape.
The first flow path portion 48A extends along the radial direction of the holder 40. The first flow path section 48A is a flow path having a circular cross section, following the shape of the inlet 48a.
The second flow path portion 48B extends along the axial direction (Y direction) of the holder 40. The second flow path section 48B is a flat flow path with a rectangular cross section.

The two branch flow path portions 48C branch in different directions from the distal end side of the second flow path portion 48B and extend to the relief portion 15a so as to draw mutually different routes. Each branch flow path portion 48C is a flow path having a circular cross section, following the shape of the outlets 48b1 and 48b2. Further, each branch flow path portion 48C may have a cross-sectional shape on the outlet 48b1, 48b2 side and a cross-sectional shape on the second flow path portion 48B side different from each other. In this case, the flow path may have a cross-sectional shape that gradually changes along the extending direction, for example, such that the outlets 48b1 and 48b2 have a circular shape.

The outlet 48b1 opens toward the intersection of the first restraining surface 12a, the second restraining surface 12b, and the wall surface 14b of the insert mounting seat 12, and supplies gas in the same direction.
The outlet 48b2 opens toward the intersection of the first restraining surface 12a, the third restraining surface 12c, and the wall surface 14c of the insert mounting seat 12, and supplies gas in the same direction.

In this modification, the exits 48b1 and 48b2 that open to the relief portion 15a have substantially the same height position in the Z direction from the first restraining surface 12a, but the height position is not limited to this. For example, as in the above embodiment, the relief portions 15a may be formed at different heights (in the Z direction) from the first restraint surface 12a. Thereby, it is possible to suppress the occurrence of turbulent flow due to interference between the gases supplied from each outlet 48b1 and 48b2, and it is possible to supply gas from each outlet 48b1 and 48b2 in different directions without interfering with each other. .

Although the previous embodiment had three exits, it may be configured to have at least two exits as in this modification. Gas is supplied from two outlets 48b1 and 48b2 toward each corner where the first restraint surface 12a intersects with the second restraint surface 12b and third restraint surface 12c, which constitute the side wall of the insert mounting seat 12. With this configuration, it is possible to efficiently discharge chips that tend to accumulate in the corners of the insert mounting seat 12.

(Modification 2)
Next, the configuration of the holder 50 in Modification 2 will be described.
FIG. 8 is a perspective view showing the configuration of the holder 50 in the second modification.
As shown in FIG. 8, the holder 50 of this modification has a fluid supply channel 58.
The fluid supply channel 58 is a channel whose outlet side does not branch. The fluid supply channel 58 includes a first channel section 58A and a second channel section 58B connected to the distal end side of the first channel section 58A.

An inlet 58a of the first flow path portion 58A opens to the outer circumferential surface 50a of the holder 50, and an outlet 58b opens to the relief portion 15a. The outlet 58b opens toward the first restraining surface 12a. It is preferable that the outlet 18b2 opens toward at least one of the second restraint surface 12b and the third restraint surface 12c. Here, for example, it opens toward the second restraining surface 12b side. The shape of the outlet 58b in this modification is not circular. As shown in FIG. 8, a part of the inner wall surface of the second flow path section 58B is formed flush with the first restraining surface 12a through the outlet 58b, so the outlet 58b has a shape other than a circular shape.

The relief portion 15a is connected to the first restraining surface 12a on both sides or one side (the second restraining surface 12b side) of the outlet 58b, but the outlet 58b is formed on the entire first restraining surface 12a side of the relief portion 15a. You can leave it there. That is, the outlet 58b may exist between the relief portion 15a and the first restraining surface 12a.

According to the configuration of this modification, it is possible to increase the opening area of the outlet 58b. Therefore, it is possible to evenly supply gas to a wide range of the first restraining surface 12a of the insert mounting seat 12 from the relief portion 15a side, centering on the direction in which the outlet 58b faces.

Moreover, since the outlet 58b of this modification is open toward the second restraining surface 12b, it is possible to intensively supply gas toward the second restraining surface 12b side. The opening direction of the outlet 58b is not limited to the second restraining surface b side, but may be the third restraining surface 12c side, and by opening the outlet 58b toward a region where chips are likely to accumulate, it is possible to improve the discharge performance of chips.

Note that the shape of the outlet 58b of the fluid supply channel 58 may be circular as in each of the above embodiments.

FIG. 9 is a perspective view showing the configuration of a holder to which the fluid supply channel according to the present invention can be applied.
Furthermore, a cutting insert having a shape different from that of the first embodiment is attached to the holder 60 shown in FIG. A cutting insert (not shown) applied to the holder 60 has a substantially triangular shape when viewed from a direction along the insert center axis.
The holder 60 has an insert mounting seat 62 formed in an insert pocket (mounting portion) 61 on the axially distal end side (+Y direction) to match the shape of the cutting insert, which has a substantially triangular shape.

The insert mounting seat 62 has four restraint surfaces (a first restraint surface 62a, a second restraint surface 62b, a third restraint surface 62c, and a fourth restraint surface 62d), three flank surfaces 63b, 63c, and 63d, and at least two It has two relief parts 64a and 64b. Among the four restraint surfaces, the three second restraint surfaces 62b, third restraint surfaces 62c, and fourth restraint surfaces 62d that restrain the side surfaces of the cutting insert all intersect at a predetermined angle with respect to the central axis of the holder 70. are doing.

The insert mounting seat 62 has a first restraining surface 62a that has a substantially triangular shape when viewed from one side around the central axis O of the holder 60. The first restraining surface 62a is a surface that contacts and restrains the seating surface of the cutting insert.
The second restraint surface 62b and the third restraint surface 62c are surfaces that abut and restrain at least one side surface of the three side surfaces of the cutting insert, respectively. The fourth restraint surface 62d abuts and restrains one of the remaining two sides of the cutting insert. The insert mounting seat 62 allows the cutting insert to be restrained from four directions.

Of the two relief portions 64a and 64b, one relief portion 64a is formed between the second restraint surface 62b and relief surface 63b and the third restraint surface 62c and relief surface 63c, and the other relief portion 64b is , is formed between the third restraint surface 62c and flank surface 63c, and the fourth restraint surface 62d and flank surface 63d.
It is possible to form the fluid supply channel according to the present invention in the holder 60 having such an insert mounting seat 62.

The shape of the fluid supply channel applicable to the holder 60 may be any of the first embodiment and the first and second modified examples described above. Moreover, it is preferable that the outlet of the fluid supply flow path is formed in one or both of the escape parts 64a and 64b. By supplying gas from the concave relief portions 64a, 64b toward the first restraining surface 62a, the chips accumulated in the insert mounting seat 62 can be effectively removed as in the above embodiment. is possible.

In the above-described embodiment, an indexable turning tool such as an indexable cutting tool used for turning is described, but it may also be a tool used for milling.

<Second embodiment>
Next, an indexable cutting tool 2 according to a second embodiment will be described.
FIG. 10 is a perspective view showing the configuration of an indexable cutting tool 2 according to the second embodiment. FIG. 11 is a perspective view showing the configuration of a holder in the indexable cutting tool of the second embodiment.

As shown in FIGS. 10 and 11, the indexable cutting tool 2 of this embodiment includes a holder 70 and a plurality of cutting inserts 80. In this embodiment, the configuration includes two cutting inserts 80, but the configuration may include three or more cutting inserts 80. The indexable cutting tool 2 processes a workpiece by rotating a holder 70 to which a cutting insert 80 is attached in a rotation direction T around a rotation axis CO.

The holder 70 has a cylindrical shape extending in the axial direction (Y direction) and is rotatable around the rotation axis CO. The cutting insert 80 is attached to each insert attachment seat 72 in two insert pockets (attachment portions) 71A and 71B formed at the tip of the holder 70.

A fluid supply channel 78 that can supply gas toward the insert pocket 71 is formed in the holder 70 . Since the fluid supply flow path 78 of the holder 70 has two insert pockets 71 (insert mounting seats 72), it has a flow path shape that can supply gas to each of the two insert pockets 71 (insert mounting seats 72).

For example, two fluid supply channels 78 may be formed within the holder 70 to correspond to the two insert pockets 71 individually. Alternatively, one fluid supply channel 78 communicating with the two insert pockets 71 may be formed. By forming one fluid supply channel 78 that communicates with two insert pockets 71, it is possible to remove chips in two insert pockets 71 at once.

The shape of the fluid supply channel 78 shown in FIG. 11 is an example and can be changed as appropriate.
Here, an example of the shape of the fluid supply channel 78 applicable to the holder 70 will be described using FIG. 11.
The holder 70 shown in FIG. 11 has, for example, one fluid supply channel 78 that communicates with two insert pockets 71. In the following explanation, the structure of a part of the fluid supply channel 78 that communicates with one insert pocket (attachment part) 71A (flow channel 78A to be described later) will be explained in detail, and the other insert pocket ( A description of the flow path configuration (flow path 78B to be described later) communicating with the mounting portion) 71B will be omitted.

In this embodiment, the insert mounting seat 72 formed in the insert pocket 71 of the holder 70 has three (first restraint surface 72a, second restraint surface 72b and third restraint surface 72c) and two (second restraint surface 72c). a relief surface 73b and a third relief surface 73c), and a relief portion 75 formed at a corner near the intersection of the second restraint surface 72b and the third restraint surface 72c.

The fluid supply channel 78 is configured to be able to simultaneously supply gas to the two insert pockets 71. The fluid supply channel 78 has a channel 78A that communicates with one insert pocket 71, a channel 78B that communicates with the other insert pocket 71, and a common channel 78C that connects these channels 78A and 78B. . In FIG. 11, only the flow path 78A communicating with one insert pocket 71 is shown by a dashed line, and the flow path 78B communicating with the other insert pocket 71 is omitted from illustration and shown only with a reference symbol.
In this embodiment, the pair of channels 78A and 78B have a common entrance due to the common channel 78C. That is, the fluid supply channel 78 has one inlet 78a, and both the channel 78A and the channel 78B communicate with this inlet 78a via the common channel 78C. Thereby, it is possible to simultaneously supply the gas supplied from the inlet 78a to the two insert pockets 71 through the respective channels 78A and 78B.

A specific configuration of the fluid supply channel 78 will be explained.
The common flow path 78C has one end connected to the inlet 78a and extends in the radial direction. The other end side of the common flow path 78C is divided into two systems (flow paths 78A and 78B). Here, one system (channel 78A) will be described as an example.
The flow path 78A has a pair of flow paths 77. The pair of flow channels 77 have proximal ends communicating with the other end of the common flow channel 78C, and distal ends extending in different directions and connected to a pair of outlets 78b1 and 78b2 formed in the relief portion 75. The respective outlets 78b1 and 78b2 that open to the relief portion 75 are both formed toward the first restraining surface 72a. One outlet 78b1 is formed, for example, toward the third restraining surface 72c side of the first restraining surface 72a. The other outlet 78b2 is formed, for example, toward the second restraining surface 72b side of the first restraining surface 72a.

Accordingly, in this embodiment as well, the two outlets 78b1 and 78b2 of the fluid supply channel 78 are formed in the relief part 75 located at the corner of the insert mounting seat 72, and the By supplying gas from different directions toward the first restraining surface 72a, it is possible to efficiently remove chips from the first restraining surface 72a.

Further, the fluid supply flow path 78 of this embodiment has a flow path 78A (having flow paths 77, 77 indicated by a dashed line in FIG. 11) that communicates with one insert pocket 71A, and a flow path 78A that communicates with the other insert pocket 71B. The compressed air supplied from the inlet 78a flows through the two flow paths 78A and 78B. It is supplied to each insert mounting seat 72. Therefore, chips can be removed from a plurality of insert mounting seats 72 in one operation, so that the chips can be easily discharged and the working time can be shortened.

In addition, in this embodiment, one fluid supply channel 78 is provided for two insert mounting seats 72, and the channel configuration is such that gas can be simultaneously supplied to the two insert mounting seats 72 in one operation. However, it is not limited to this configuration. For example, the fluid supply channels 78 may be formed in accordance with the number of insert mounting seats 72, and the insert mounting seats 72 and the fluid supply channels 78 may have a one-to-one relationship. It is preferable to change the path (flow path configuration) of the fluid supply flow path 78 as appropriate depending on the number of insert mounting seats 72.

In this embodiment, two outlets 78b1 and 78b2 are formed for each insert mounting seat 72, but the number of outlets can be changed as appropriate. For each insert mounting seat 72, the fluid supply channel 78 may have one outlet, or three or more outlets.
Depending on the number of insert mounting seats 72 provided in the holder 70, the shape of the fluid supply channel 78 can also be changed as appropriate.

[Other configurations included in the present invention]
Note that the present invention is not limited to the above-described embodiments, and as described below, changes in the configuration can be made without departing from the spirit of the present invention.

For example, in each of the embodiments and modifications described above, the outlet of the fluid supply channel is mainly formed in the relief part, but it may be formed in a place other than the relief part. The outlet of the fluid supply flow path may be formed, for example, in at least one of the restraint surfaces and flanks facing the seating surface and side surface of the cutting insert.

According to the indexable cutting tool of the present invention, chips remaining in the holder (insert mounting seat) can be easily discharged. Therefore, it has industrial applicability.

1, 2... Indexable cutting tool 10, 40, 50, 60, 70... Holder 10a, 50a... Outer peripheral surface of holder 10b... Base end surface 11, 61, 71, 71A, 71B... Insert pocket (mounting part)
12, 62, 72...Insert mounting seat 12a...First restraint surface 12b...Second restraint surface 12c...Third restraint surface 15a, 75...Escape part 15b, 15c, 64a, 64b...Escape part 18, 48, 58, 78 ...Fluid supply channel 18a, 48a, 58a, 78a...Inlet 18b1, 18b2, 18b3, 48b1, 48b2, 58b, 78b1, 78b2...Outlet 20, 80...Cutting insert 23...Seating surface 24...Side surface 62a, 72a...First Restriction surface 62b, 72b...Second restriction surface 62c, 72c...Third restriction surface 77, 78A, 78B...Flow path

Claims (6)

cutting insert;
a mounting portion having an insert mounting seat to which the cutting insert is mounted;
a holder having a fluid supply flow path for supplying fluid to the attachment part,
The insert mounting seat is
a first restraint surface that restrains a seating surface of the cutting insert; a second restraint surface that intersects the first restraint surface and restrains a side surface of the cutting insert; and a first restraint surface and a second restraint surface. and a third restraint surface that intersects,
The fluid supply channel has an outlet that communicates with the attachment part and opens toward the first restraining surface.
Indexable cutting tool. The outlet of the fluid supply flow path is open toward at least one side of the second restraining surface and the third restraining surface.
The indexable cutting tool according to claim 1. an escape portion located between the second restraint surface and the third restraint surface, and the outlet of the fluid supply flow path is located between the first restraint surface, the second restraint surface, and the third restraint surface. opening in the relief portion where the planes intersect;
The indexable cutting tool according to claim 1 or 2. When viewed from a direction along a center line of the outlet, at least a portion of the opening area of the outlet overlaps with the first restraining surface;
The indexable cutting tool according to any one of claims 1 to 3. The fluid supply channel has a plurality of outlets for one attachment part,
The indexable cutting tool according to any one of claims 1 to 4. The inlet of the fluid supply flow path is open to the outer circumferential surface of the holder or to the proximal end surface on the opposite side in the length direction from the mounting portion.
The indexable cutting tool according to any one of claims 1 to 5.

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