JP2022154328A - Coolant discharge member and tip-replaceable cutting tool - Google Patents

Abstract

To provide a coolant discharge member whose outer shape can be suppressed to be small and whose structure can be simplified, and a tip-replaceable cutting tool having the same.SOLUTION: A coolant discharge member 10 which is attached to a holder 4 having a coolant supply path 47 and discharges a coolant supplied from the coolant supply path 47 toward a cutting blade 3 comprises: a fitting cylinder 11 which is inserted to an opening 47a of the coolant supply path 47 and extends in the vertical direction along a center axis; a nozzle part 12 which is connected to the upper portion of the fitting cylinder 11 and extends in the discharge direction intersecting the center axis; and a flow path 14 which extends over the inside of the fitting cylinder 11 and the inside of the nozzle part 12 and in which the coolant flows. The nozzle part 12 has a clamp surface 17 which is oriented to the outer side in the radial direction orthogonal to the center axis and is pressed against the clamp member 7 held by the holder 4. The clamp surface 17 has an inclined surface shape located on the outer side in the radial direction as heading downward.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a coolant discharge member and an indexable cutting tool.

Conventionally, for example, a cutting tool described in Patent Document 1 is known. This cutting tool includes a cooling liquid conveying member (coolant discharge member) detachably attached to the tool body. The cooling fluid delivery member includes a member body and a nozzle shiftably engaged with the member body for ejecting cooling fluid into the cutting area. The cooling liquid conveying member is fixed to the tool body by inserting a plurality of fixing screws into a plurality of through holes penetrating the member body and screwing them to the tool body.

Japanese Patent No. 5587345

Since the conventional coolant discharge member has a large outer shape, chips are likely to get entangled, and the structure is complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a coolant discharge member capable of reducing the outer shape and simplifying the structure, and an indexable cutting tool including the same.

One aspect of the present invention is a coolant discharge member that is attached to a holder having a coolant supply path and discharges coolant supplied from the coolant supply path toward a cutting edge, wherein the opening of the coolant supply path a mounting cylinder that is inserted and extends vertically along a central axis; a nozzle portion that is connected to the upper portion of the mounting cylinder and extends in a discharge direction that intersects with the central axis; a flow path extending internally through which the coolant flows, wherein the nozzle portion has a clamp surface facing outward in a radial direction orthogonal to the central axis and pressed against a clamp member held by the holder; The clamp surface has an inclined surface shape that is located radially outward toward the lower side.

To attach the coolant discharge member of the present invention to the holder, the attachment cylinder is inserted into the opening of the coolant supply path, and the clamping member presses the clamping surface of the nozzle portion. The clamp surface is configured by a plane or the like that faces radially outward and is inclined with respect to the central axis of the mounting cylinder. Specifically, the clamping surface is in the shape of an inclined surface positioned radially outward toward the lower side. Therefore, the clamp member presses the clamp surface, thereby restricting upward movement and circumferential rotational movement of the coolant discharge member about the central axis. More specifically, the pressing force applied to the clamp surface prevents the mounting cylinder from slipping upward from the opening of the coolant supply passage. Also, the nozzle portion is prevented from rotating in the circumferential direction around the central axis. That is, it is possible to fix the coolant discharge member to the holder in a state in which the coolant discharge member is prevented from coming off and rotated by a simple structure and a simple operation of pressing the clamp surface with the clamp member.

Specifically, the clamp surface is configured by, for example, a flat surface arranged on a part of the outer peripheral surface of the nozzle section. Unlike the present invention, for example, compared to a configuration in which fixing screws are inserted into a plurality of through holes vertically penetrating the nozzle portion and screwed to the holder, according to the present invention, the coolant discharge member is provided. The outer shape can be kept small, and the structure can be simplified.

More specifically, according to the present invention, it is not necessary to provide a plurality of through holes in the nozzle section while avoiding the internal flow path, and the provision of the clamping surface is less likely to be affected by the layout of the flow path. In addition, it is easy to keep the surface area of the clamp surface small while ensuring the pressing force on the clamp surface. Therefore, it is easy to make the nozzle part compact. In addition, it is possible to reduce the amount of material used for forming the coolant discharge member.

Further, since the nozzle portion can be made smaller, it is possible to suppress the problem that chips extending from the cutting portion get entangled in the nozzle portion during cutting, and good chip disposability can be maintained. As a result, it is possible to avoid problems such as collection of chips in the machine tool, and to suppress problems such as damage to the machined surface of the work material due to tangled chips. Therefore, according to the present invention, it is possible to stably improve the machined surface quality of the work material.

Regarding the manufacture of the coolant discharge member, unlike the present invention, for example, unlike the present invention, which has a complicated structure in which a through hole is formed in the nozzle portion and is screwed to the holder with a plurality of fixing screws, the number of parts is reduced according to the present invention. can be reduced, assembly is easy, and manufacturing costs can be reduced.

In the coolant discharge member, it is preferable that the clamp surface is arranged in a portion of the nozzle portion other than the end portion on the tip side in the discharge direction.

In this case, it is easy to dispose the clamp member that presses the clamp surface apart from the cut portion. Therefore, problems such as entanglement of chips in the clamp member are further suppressed.

In the above coolant discharge member, it is preferable that the clamp surface faces a left-right direction orthogonal to the up-down direction when viewed from the discharge direction.

In this case, since the clamp surface faces a direction different from the coolant discharge direction, it is easy to lay out the clamp surface on the nozzle portion. That is, it is easy to provide the inclined surface-like clamping surface in the nozzle part while reducing the size of the nozzle part and suppressing the influence on the layout of the flow path.

In the coolant discharge member, the clamp surface preferably faces the rear end side in the discharge direction.

In this case, the clamping surfaces and clamping members can be positioned further away from the cutting site. Specifically, since the clamp member can be arranged on the rear end side of the nozzle portion in the ejection direction, that is, behind the nozzle, it is possible to further suppress chips from reaching the clamp member. For this reason, it is easier to suppress problems such as entanglement of chips in the clamp member.

In the coolant discharge member, it is preferable that a plurality of the clamping surfaces be provided side by side in a circumferential direction around the central axis.

In this case, for example, according to the shape of the holder, the shape of the cutting edge, cutting conditions, etc., the optimum clamping surface can be appropriately selected from a plurality of clamping surfaces arranged in the circumferential direction and used for clamping the nozzle portion. . As a result, the coolant can be efficiently discharged toward the cutting edge, and the tool life can be improved. Moreover, chips can be stably divided, good chip disposability can be maintained, and the machined surface quality of the work can be improved.

In the coolant discharge member, it is preferable that the plurality of clamping surfaces include a pair of clamping surfaces facing opposite to each other in the radial direction.

In this case, the same coolant discharge member can be used as a common product regardless of whether the cutting tool is right-handed or left-handed. That is, it is possible to use a common coolant discharge member for cutting tools with opposite sides. Therefore, the versatility of the coolant discharge member is enhanced, and member management is easy.

Preferably, in the coolant discharge member, the plurality of clamp surfaces are arranged to be connected to each other in the circumferential direction.

Unlike the present invention, for example, in the case of a configuration in which a fixing screw is inserted through a through-hole of the nozzle portion and screwed to the holder, it is necessary to lay out a plurality of through-holes at intervals so as not to interfere with each other. In contrast, according to the present invention, a plurality of clamping surfaces can be arranged in a circumferentially connected manner. Therefore, the area for arranging a plurality of clamp surfaces can be kept small, and the nozzle section can be made more compact.
Then, for example, according to the shape of the holder, the shape of the cutting edge, cutting conditions, etc., the optimum clamping surface can be appropriately selected from a plurality of clamping surfaces arranged in the circumferential direction and used for clamping the nozzle portion. That is, by selecting one of a plurality of clamping surfaces, it is possible to appropriately adjust the discharge angle about the central axis for discharging coolant. As a result, the coolant can be efficiently discharged toward the cutting edge, and the tool life can be improved. Moreover, chips can be stably divided, good chip disposability can be maintained, and the machined surface quality of the work can be improved.

In the coolant discharge member, it is preferable that the plurality of clamp surfaces have different circumferential dimensions.

In this case, for example, a clamp surface with a small circumferential dimension can be used to finely adjust the coolant discharge direction, specifically, the coolant discharge angle around the central axis, or a clamp surface with a large circumferential dimension can be used to finely adjust the coolant discharge angle with the clamp member. It is possible to stably increase the pressing force by increasing the contact area. That is, according to the above configuration, it is possible to appropriately select and use the optimum clamping surface according to, for example, the shape of the holder, the shape of the cutting edge, cutting conditions, and the like.

In the coolant discharge member, it is preferable that the nozzle portion tapers toward the tip side in the discharge direction.

In this case, chips traveling from the cutting site to the nozzle section are less likely to get entangled in the nozzle section. Therefore, good chip disposability can be maintained, and the machined surface quality of the work material can be improved more stably. Moreover, since the nozzle portion can be made more compact, the amount of material used for forming the nozzle portion can be further reduced.

Further, one aspect of the indexable cutting tool of the present invention includes a cutting insert having the cutting edge, the holder having an insert mounting seat to which the cutting insert is detachably mounted, the coolant discharge member described above, and the clamp member for clamping the coolant discharge member, wherein the coolant discharge member is arranged at a position not overlapping the cutting insert when viewed from the vertical direction.

In this case, the coolant discharge member is prevented from interfering with the work of attaching and detaching the cutting insert to and from the insert mounting seat. That is, the cutting insert can be attached to and detached from the insert mounting seat while the coolant discharge member is attached to the holder. Therefore, the workability of attaching and detaching the cutting insert is good.

In the indexable cutting tool, it is preferable that the holder has a holding portion that holds the clamp member, the holding portion protruding upward from the upper surface of the holder and facing the nozzle portion in a radial direction. .

In this case, the holder holds the clamp member with a simple structure. In addition, the outer shape of the holding portion can be kept small, and problems such as entanglement of chips in the holding portion can be easily suppressed.

ADVANTAGE OF THE INVENTION According to the coolant discharge member and indexable cutting tool of one aspect of this invention, an outer shape can be suppressed small and a structure can be simplified.

FIG. 1 is a perspective view showing an indexable cutting tool according to this embodiment. FIG. 2 is an exploded perspective view showing a part of the indexable cutting tool of this embodiment. FIG. 3 is a top view showing the coolant discharge member of this embodiment. FIG. 4 is a front view showing the coolant discharge member of this embodiment. FIG. 5 is a bottom view showing the coolant discharge member of this embodiment. FIG. 6 is a side view showing the coolant discharge member of this embodiment. 7 is a cross-sectional view (longitudinal cross-sectional view) showing a VII-VII cross section of FIG. 4. FIG. FIGS. 8A, 8B, and 8C are front views illustrating the coolant outlet of this embodiment and the coolant outlet of a comparative example. FIG. 9 is a top view showing a coolant discharge member of a first modified example of this embodiment. FIG. 10 is a perspective view showing a part of the indexable cutting tool of the first modified example of this embodiment. FIG. 11 is a top view showing a coolant discharge member of a second modified example of this embodiment. FIG. 12 is a perspective view showing a part of the indexable cutting tool of the second modification of the present embodiment. FIG. 13 is a perspective view showing part of an indexable cutting tool according to a second modification of the present embodiment. FIG. 14 is a front view showing a coolant discharge port of a coolant discharge member according to a third modified example of this embodiment. FIG. 15 is a front view showing a coolant discharge port of a coolant discharge member according to a fourth modified example of this embodiment. FIG. 16 is a front view showing a coolant discharge port of a coolant discharge member according to a fifth modified example of this embodiment. FIG. 17 is a front view showing a coolant discharge port of a coolant discharge member according to a sixth modification of the present embodiment. FIG. 18 is a front view showing a coolant discharge port of a coolant discharge member according to a seventh modified example of this embodiment. FIG. 19 is a front view showing a coolant discharge port of a coolant discharge member according to an eighth modification of the present embodiment.

A coolant discharge member 10 of one embodiment of the present invention and an indexable cutting tool 1 including the same 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 is detachably attached to a tool post of a machine tool such as a lathe (not shown). be done.

As shown in FIGS. 1 and 2, the indexable cutting tool 1 includes a cutting insert 2 having a cutting edge 3, a holder 4 having an insert mounting seat 5 to which the cutting insert 2 is detachably mounted, the cutting insert 2 to the insert mounting seat 5, a coolant discharge member 10, and a clamp member 7 for clamping the coolant discharge member 10.
As shown in FIGS. 3 to 7, the coolant discharge member 10 includes a cylindrical mounting cylinder 11 centered on the central axis C, a nozzle portion 12 connected to the mounting cylinder 11, and a seal member 13 (see FIG. 2). ), and a channel 14 through which coolant flows.

[Definition of direction]
In this embodiment, the direction in which the central axis C of the mounting cylinder 11 extends is called the vertical direction. In the XYZ orthogonal coordinate system shown in each figure, the vertical direction corresponds to the Z-axis direction. In the vertical direction, the upper side is the +Z side and the lower side is the -Z side. Note that the vertical direction may also be called the axial direction. In this case, the upper side corresponds to one side in the axial direction, and the lower side corresponds to the other side in the axial direction.
A direction perpendicular to the central axis C is called a radial direction. Of the radial directions, the direction closer to the central axis C is called the radial inner side, and the direction away from the central axis C is called the radial outer side.
The direction of rotation around the central axis C is called the circumferential direction.

The nozzle portion 12 extends in a direction intersecting with the central axis C. As shown in FIG. The direction in which the nozzle portion 12 extends is called the ejection direction. That is, the nozzle portion 12 extends in the ejection direction. In this embodiment, the nozzle portion 12 extends in a direction orthogonal to the central axis C. As shown in FIG. Therefore, the ejection direction is one of the radial directions. In each figure, the ejection direction corresponds to the Y-axis direction. In the ejection direction, the leading end side (nozzle leading end side) is the +Y side, and the trailing end side (nozzle trailing end side) is the -Y side. Note that the ejection direction may also be referred to as the front-rear direction. In this case, the front end side in the discharge direction corresponds to the front side, and the rear end side in the discharge direction corresponds to the rear side.
A direction orthogonal to the up-down direction when viewed from the ejection direction is called a left-right direction. In each figure, the horizontal direction corresponds to the X-axis direction. In the horizontal direction, the left side is the +X side and the right side is the -X side.

In FIG. 1, the direction in which the tool center axis (not shown) of the holder 4 extends is called the tool axis direction. Of the axial directions of the tool, the direction from the first end 4a to the second end 4b of the holder 4 is called the tool rear end side, and the direction from the second end 4b to the first end 4a is called the tool tip side. call.
A direction orthogonal to the tool axial direction and the vertical direction is called the tool width direction.

The direction in which the insert central axis (not shown) of the cutting insert 2 extends is called the insert axial direction. In this embodiment, the insert axial direction and the vertical direction are substantially the same direction. That is, the center axis C of the mounting cylinder 11 and the center axis of the insert extend substantially parallel.
The direction perpendicular to the center axis of the insert is called the radial direction of the insert. In the radial direction of the insert, the direction closer to the center axis of the insert is called the inside in the insert radial direction, and the direction away from the center axis of the insert is called the outside in the insert radial direction.
The direction of rotation around the center axis of the insert is called the insert circumferential direction.

In this embodiment, the upper side, the lower side, the front side, the rear side, the left side, and the right side are names for simply explaining the relative positional relationship of each part, and the actual positional relationship etc. are indicated by these names. An arrangement relationship or the like other than the arrangement relationship may be used.

〔holder〕
The holder 4 is made of metal such as steel. As shown in FIGS. 1 and 2, the holder 4 has a substantially prismatic shape and extends in the tool axis direction. The insert mounting seat 5 is arranged at a first end portion 4a of both ends of the holder 4 in the tool axial direction.

The holder 4 has a top surface 41 arranged on the outer surface of the holder 4 , a bottom surface 42 , a pair of lateral surfaces 43 and 44 , and a tool tip surface 45 . The top surface 41 faces upward. The bottom surface 42 faces downward. A pair of lateral surfaces 43 and 44 face the tool width direction. The pair of lateral surfaces 43 and 44 face opposite sides in the tool width direction. The tool tip surface 45 faces the tool tip side.
A portion of the top surface 41 located at the first end portion 4a of the holder 4 protrudes upward from a portion other than the first end portion 4a. Of the pair of lateral surfaces 43 and 44, one lateral surface 43 has a portion located at the first end portion 4a of the holder 4 that protrudes in the tool width direction more than portions other than the first end portion 4a.

The holder 4 includes an insert mounting seat 5 to which the cutting insert 2 is detachably mounted, a holding portion 46 that holds the clamp member 7, a coolant supply path 47, a fixing screw mounting hole 48, and a lever insertion hole (not shown). , has

The insert mounting seat 5 has a plate-like seat member 51 . The seat member 51 constitutes a portion (bottom surface) of the insert mounting seat 5 . In this embodiment, the sheet member 51 has a rectangular plate shape. A pair of plate surfaces of the sheet member 51 face up and down. The sheet member 51 has a sheet hole (not shown) penetrating the sheet member 51 in the vertical direction.

The insert mounting seat 5 opens to the top surface 41 , one side surface 43 and the tool tip surface 45 at the first end 4 a of the holder 4 , that is, the tool tip. The insert mounting seat 5 is recessed from the top surface 41 of the holder 4 , one side surface 43 and the tool tip surface 45 . The insert mounting seat 5 is a recess that can receive the cutting insert 2 . In this embodiment, the insert mounting seat 5 has a substantially rectangular concave shape.

The insert mounting seat 5 has a bottom wall 5a in contact with the back surface 22 of the cutting insert 2, a side wall 5b in contact with the outer peripheral surface 23 of the cutting insert 2, and a relief portion 5c.
The bottom wall 5 a is configured by one of the pair of plate surfaces of the sheet member 51 (upper surface) facing upward.

A plurality of side walls 5b are provided. In this embodiment, the insert mounting seat 5 has a pair of side walls 5b. The angle formed between the pair of side walls 5b when viewed from the insert axial direction is, for example, 55° to 90°, and is 80° in this embodiment.
The relief portion 5c is arranged between the pair of side walls 5b. The recessed portion 5c is recessed outwardly in the radial direction of the insert from the pair of side walls 5b. The recessed portion 5c is in the form of a groove that opens to the top surface 41 and extends in the axial direction of the insert.

The holding portion 46 protrudes upward from the top surface 41 , that is, the upper surface of the holder 4 . The holding portion 46 is arranged on the first end portion 4 a of the top surface 41 . In this embodiment, the holding portion 46 has a plate shape. A pair of plate surfaces of the holding portion 46 face the radial direction. Further, the holding portion 46 extends in the ejection direction when viewed from the vertical direction. The holding portion 46 faces the nozzle portion 12 in the radial direction. Specifically, the holding portion 46 is arranged adjacent to the nozzle portion 12 of the coolant discharge member 10 in the radial direction, and one of the pair of plate surfaces of the holding portion 46 is located on the outer peripheral surface of the nozzle portion 12 . They face each other from the outside in the radial direction. In this embodiment, the holding portion 46 faces the nozzle portion 12 in the left-right direction. The holding portion 46 has a radial dimension, that is, a plate thickness dimension that decreases upward from the top surface 41 . Moreover, the dimension of the holding portion 46 along the discharge direction becomes smaller as it goes upward from the top surface 41 . That is, the holding portion 46 tapers toward the upper side.

The holding portion 46 has a female screw hole 46a. The female screw hole 46a penetrates the holding portion 46 in the radial direction (plate thickness direction). A screw central axis (not shown) of the female screw hole 46a extends downward as it goes radially inward. That is, the screw central axis of the female screw hole 46a extends obliquely with respect to the radial direction. A set screw, which is the clamp member 7 of the present embodiment, is screwed into the female screw hole 46a.

The coolant supply path 47 extends inside the holder 4 . A coolant supply path 47 is provided through the holder 4 . The coolant supply path 47 includes a portion extending vertically in the holder 4 and a portion (not shown) extending in the tool axial direction in the holder 4 . The coolant supply path 47 has an opening 47a that opens to the top surface 41 of the holder 4, and a pipe connection port (not shown).

The opening 47a has a circular hole shape centered on the central axis C and extends in the vertical direction. That is, the central axis of the opening 47 a is coaxial with the central axis C of the mounting cylinder 11 . The opening 47a opens to a portion of the top surface 41 located at the first end 4a. The opening 47 a is arranged adjacent to the holding portion 46 . The opening 47 a is arranged side by side with the insert mounting seat 5 . The opening 47a is formed by drilling the top surface 41 of the holder 4 with, for example, a drill or an end mill. The opening 47a serves as an outlet through which the coolant flowing through the coolant supply path 47 flows.

Although not particularly illustrated, the pipe connection port opens, for example, in the lower surface of the holder 4, that is, the bottom surface 42. As shown in FIG. The pipe connection port serves as an inlet for receiving coolant in the coolant supply path 47 . A piping member, tube member, or the like (not shown) is connected to the piping connection port. The pipe connection port may be opened in the rear end surface of the holder 4 facing the tool rear end side, the lateral surfaces 43 and 44, or the like. When the pipe connection port opens on the lateral surfaces 43 and 44 , the coolant supply path 47 includes a portion extending in the tool width direction inside the holder 4 .

The fixing screw mounting hole 48 opens in the top surface 41 and extends vertically. The fixing screw mounting hole 48 opens in a portion of the top surface 41 located at the first end portion 4a. The fixing screw mounting hole 48 is arranged side by side with the insert mounting seat 5 . Although not particularly shown, the fixing screw mounting hole 48 has a female screw portion on its inner peripheral surface.

Although not shown, the lever insertion hole extends inside the holder 4 . The lever insertion hole is arranged inside the first end 4 a of the holder 4 . The lever insertion hole includes, for example, a portion extending in an oblique direction intersecting the vertical direction. One end of the lever insertion hole opens toward the seat hole of the seat member 51 . The other end of the lever insertion hole opens into the fixing screw mounting hole 48 .

[Cutting insert]
The cutting insert 2 is made of cemented carbide, PCD (polycrystalline diamond), cBN (cubic boron nitride), cermet, ceramic, or the like, for example. The cutting insert 2 is a hard sintered body having higher hardness than the holder 4 . The cutting insert 2 of this embodiment has a rectangular plate shape centered on the center axis of the insert. The cutting insert 2 is, for example, a rhombic insert conforming to ISO standards. The cutting insert 2 has a plurality of corners. The cutting insert 2 of this embodiment has a symmetrical shape with the front and back reversed, and is a so-called double-sided type. However, not limited to this, the cutting insert 2 may be of a so-called single-sided type.

The cutting insert 2 has a front surface 21 and a back surface 22 facing in the axial direction of the insert, that is, a vertical direction, an outer peripheral surface 23 connected to the front surface 21 and the back surface 22, and at least a ridge portion connecting the front surface 21 and the outer peripheral surface 23. It has a cutting edge 3 arranged thereon and a through hole 24 .

The surface 21 is polygonal, and in this embodiment is square. The surface 21 faces upwards. The surface 21 has a rake face 21a. The rake face 21 a is arranged on at least a portion of the surface 21 adjacent to the cutting edge 3 . Although not shown, the front surface 21 is appropriately provided with a chip breaker according to the cutting application or the like. Cutting uses include, for example, finishing, light cutting, medium cutting, medium/rough cutting, and stainless steel.

The back surface 22 has a polygonal shape, and in this embodiment, has a quadrangular shape. The back surface 22 faces downward. The back surface 22 has a seating surface. The seating surface contacts the bottom wall 5a of the insert mounting seat 5, that is, the plate surface (upper surface) of the seat member 51 facing upward.

The outer peripheral surface 23 faces outward in the radial direction of the insert and extends in the circumferential direction of the insert. The outer peripheral surface 23 has a flank 23a. The flank 23 a is arranged at least in a portion of the outer peripheral surface 23 adjacent to the cutting edge 3 .

The outer peripheral surface 23 has a plurality of planar portions 23b arranged in the circumferential direction of the insert. The flat portion 23b faces outward in the radial direction of the insert and extends in the circumferential direction of the insert. The flat portion 23b has a rectangular shape with a dimension in the circumferential direction of the insert that is larger than the dimension in the axial direction of the insert. In this embodiment, the outer peripheral surface 23 has four plane portions 23b. Of the four flat portions 23b, the pair of flat portions 23b facing the rear end side (-Y side) in the ejection direction come into contact with the pair of side walls 5b of the insert mounting seat 5. As shown in FIG.

The cutting edge 3 is arranged at a corner portion of the cutting insert 2 that is positioned at least at the end on the tip side (+Y side) in the ejection direction. The cutting edge 3 protrudes toward the tool tip side from the tool tip surface 45 . The cutting edge 3 protrudes in the tool width direction from one lateral surface 43 . The cutting edge 3 is arranged at the ridge line where the rake face 21a and the flank face 23a are connected. The cutting edge 3 has a convex V shape protruding toward the tip side in the discharge direction. The cutting edge 3 has a convex curve-shaped corner edge and a pair of linear edge parts connected to both ends of the corner edge and extending linearly. When viewed from the insert axial direction, the angle formed between the pair of straight blades is, for example, 55° to 90°, and is 80° in this embodiment. Moreover, the cutting edge 3 extends in the left-right direction when viewed from the discharge direction.

The through hole 24 penetrates the cutting insert 2 in the insert axial direction. The through hole 24 extends in the insert axial direction inside the cutting insert 2 and opens to the front surface 21 and the back surface 22 . The through hole 24 has a circular hole shape centering on the central axis of the insert.

[Insert fixing structure]
The insert fixing structure 6 is screwed into the L-shaped lever 61 extending over the through hole 24 of the cutting insert 2, the seat hole of the seat member 51, the lever insertion hole and the fixing screw mounting hole 48, and the fixing screw mounting hole 48. and a fixing screw 62 . The insert fixing structure 6 of this embodiment is a so-called lever lock type insert clamp structure.

The lever 61 is inserted into the through hole 24 of the cutting insert 2, the seat hole of the seat member 51, and the lever insertion hole. One end of both ends of the lever 61 contacts the inner peripheral surface of the through hole 24 . In this embodiment, one end of the lever 61 is accommodated in the through hole 24 without protruding upward from the through hole 24 . Although not shown, the other end of the lever 61 protrudes into the fixing screw mounting hole 48 from the lever insertion hole.

The fixing screw 62 extends in the axial direction of the insert. Although not particularly illustrated, the fixing screw 62 has a male threaded portion on its outer peripheral surface. Moreover, the fixing screw 62 has a tapered conical surface whose diameter decreases downward along the screw axis at a position different from the male threaded portion on the outer peripheral surface. The male screw portion of the fixing screw 62 is screwed into the female screw portion of the fixing screw mounting hole 48 . By screwing the fixing screw 62 into the fixing screw mounting hole 48, the conical surface of the fixing screw 62 pushes the other end of the lever 61 downward. As a result, one end of the lever 61 presses the inner peripheral surface of the through hole 24, and the cutting insert 2 is pulled toward the rear end side (-Y side) in the discharge direction. The pair of flat portions 23b of the cutting insert 2 are pressed against the pair of side walls 5b of the insert mounting seat 5, thereby fixing the cutting insert 2 to the insert mounting seat 5. As shown in FIG.
Although not shown, the insert fixing structure 6 may have a half-cylindrical seat stop pin surrounding a part of the lever 61 . In this case, the sheet stop pin is inserted across the sheet hole and the lever insertion hole of the sheet member 51 in an elastically deformed state.

[Coolant discharge member]
The coolant discharge member 10 is attached to the holder 4 and discharges the coolant supplied from the coolant supply path 47 toward the cutting edge 3 . The coolant discharge member 10 is detachably attached to the first end portion 4a of the holder 4 . The coolant discharge member 10 protrudes upward from the top surface 41 of the holder 4 . The coolant discharge member 10 is arranged at a position that does not overlap the cutting insert 2 when viewed in the vertical direction. Also, the coolant discharge member 10 is arranged at a position that does not overlap the fixing screw 62 when viewed in the vertical direction.

Of the coolant discharge member 10, the mounting cylinder 11, the nozzle portion 12, and the flow path 14 are integrally formed of a metal material, a resin material, or the like, for example, using lamination molding using a 3D printer or the like. The seal member 13 of the coolant discharge member 10 is separate from the mounting cylinder 11, the nozzle portion 12 and the flow path 14, and is made of, for example, an elastic material.

As shown in FIGS. 4 to 7, the mounting cylinder 11 extends vertically along the central axis C. As shown in FIGS. The mounting cylinder 11 has a cylindrical shape centered on the central axis C. As shown in FIG. As shown in FIGS. 1 and 2, the mounting cylinder 11 is inserted into the opening 47a of the coolant supply passage 47. As shown in FIG. The mounting cylinder 11 is fitted into the opening 47a so as to be rotatable around the central axis C with respect to the opening 47a. In this embodiment, the entire mounting cylinder 11 is accommodated in the opening 47a.

As shown in FIG. 4, the mounting cylinder 11 has a seal groove 11a. The seal groove 11a is recessed radially inward from the outer peripheral surface of the mounting cylinder 11 and extends along the circumferential direction. The seal groove 11a is an annular groove centered on the central axis C. As shown in FIG.

As shown in FIGS. 3 to 7, the nozzle portion 12 is connected to the upper portion of the mounting cylinder 11. As shown in FIGS. In this embodiment, the nozzle portion 12 is connected to the upper end portion of the mounting cylinder 11 . The nozzle part 12 has a tubular shape extending in the ejection direction.
The nozzle portion 12 has a body portion 15 and a protruding portion 16 that protrudes from the body portion 15 toward the tip side (+Y side) in the ejection direction. The projecting portion 16 is arranged at least at the end portion of the nozzle portion 12 on the tip side in the ejection direction. The body portion 15 constitutes a portion of the nozzle portion 12 that is located on the rear end side in the ejection direction from the projecting portion 16 .

The body portion 15 has a substantially hemispherical shape centered on the central axis C and protruding upward. The body portion 15 is arranged coaxially with the mounting cylinder 11 and positioned directly above the mounting cylinder 11 . The diameter (outer diameter) of the body portion 15 is larger than the diameter of the mounting cylinder 11 . The lower surface 15a of the body portion 15 is a circular ring-shaped plane extending in a direction perpendicular to the central axis C. As shown in FIG. A lower surface 15 a of the body portion 15 contacts the top surface 41 of the holder 4 .

Body portion 15 has a clamping surface 17 . That is, the nozzle portion 12 has a clamping surface 17 . The clamp surface 17 is arranged in a portion of the nozzle portion 12 other than the end portion on the tip side in the ejection direction, and is arranged in the main body portion 15 in this embodiment. The clamping surface 17 faces radially outward and is pressed against the clamping member 7 held by the holder 4 (see FIG. 1). The clamp surface 17 is arranged on the outer peripheral surface of the body portion 15 . Specifically, the clamp surface 17 is arranged on a portion of the outer peripheral surface of the body portion 15 facing radially outward. More specifically, the clamping surface 17 is arranged at the radially outer end of the body portion 15 .

As shown in FIG. 4, the clamping surface 17 has an inclined surface that is located radially outward toward the bottom. That is, the clamp surface 17 is inclined with respect to the central axis C. As shown in FIG. In this embodiment, the clamp surface 17 is circular and planar. As shown in FIG. 4, the clamp surface 17 faces in the horizontal direction when viewed from the ejection direction (Y-axis direction).

As shown in FIG. 3, a plurality of clamping surfaces 17 are arranged at intervals in the circumferential direction around the central axis C. As shown in FIG. That is, a plurality of clamp surfaces 17 are provided side by side in the circumferential direction. The plurality of clamping surfaces 17 includes a pair of clamping surfaces 17 that are diametrically opposed to each other. In this embodiment, a pair of clamping surfaces 17 are provided on the body portion 15, one of the pair of clamping surfaces 17 facing left (+X side) and the other facing right (−X side). Three or more clamping surfaces 17 may be provided on the body portion 15 at intervals in the circumferential direction.

As shown in FIGS. 3 to 7, the projecting portion 16 has a smaller dimension in the left-right direction as it goes from the body portion 15 toward the tip side (+Y side) in the ejection direction. In addition, the vertical dimension of the projecting portion 16 decreases toward the distal end side in the ejection direction from the main body portion 15 . The protruding portion 16 tapers toward the tip side in the ejection direction. That is, the nozzle portion 12 tapers toward the tip side in the ejection direction.

A lower surface 16a of the projecting portion 16 has a planar shape extending in a direction perpendicular to the central axis C. As shown in FIG. A lower surface 16 a of the projecting portion 16 contacts the top surface 41 of the holder 4 . The end surface of the projecting portion 16 facing the tip side in the ejection direction, that is, the tip surface 16c of the nozzle portion 12 is an annular flat surface extending in a direction perpendicular to the ejection direction. A portion of the outer surface of the projecting portion 16 other than the lower surface 16a and the tip end surface 16c has a substantially convex curved shape. In addition, the upper surface 16b of the protruding portion 16 is positioned downward toward the distal end side in the ejection direction.

As shown in FIG. 1, the distal end portion of the projecting portion 16 in the discharge direction is arranged so as to overlap the relief portion 5c when viewed from above and below. That is, the tip of the nozzle portion 12 in the discharge direction overlaps with the relief portion 5c when viewed from above and below.

As shown in FIG. 2, the seal member 13 has an annular shape centered on the central axis C. As shown in FIG. The sealing member 13 is, for example, an O-ring, and is elastically deformable. The seal member 13 is fitted to the outer peripheral portion of the mounting cylinder 11 . Specifically, the seal member 13 is arranged in the seal groove 11 a of the mounting cylinder 11 . The seal member 13 seals between the mounting cylinder 11 and the opening 47a.

As shown in FIGS. 4, 5 and 7, the flow path 14 extends through the inside of the mounting cylinder 11 and the inside of the nozzle portion 12 . The flow path 14 is provided through the coolant discharge member 10 . The channel 14 has a coolant supply port 18 , a coolant discharge port 19 and a communication channel 20 .

The coolant supply port 18 opens on the outer surface of the mounting cylinder 11 . Specifically, the coolant supply port 18 opens to the lower surface 11 b of the mounting cylinder 11 . The coolant supply port 18 has a circular hole shape centering on the central axis C and extends in the vertical direction.

The coolant discharge port 19 opens in a surface of the nozzle portion 12 facing the distal end side in the discharge direction, that is, a distal end surface 16c. The coolant discharge port 19 extends in the discharge direction. As shown in FIG. 4, the coolant discharge port 19 has a lower side 19a extending in the horizontal direction when the coolant discharge port 19 is viewed from the discharge direction. In this embodiment, the lower side 19a extends linearly along the left-right direction. When viewed from the discharge direction, the portion of the peripheral edge of the coolant discharge port 19 other than the lower side 19a forms an upwardly convex curvilinear shape. In the coolant discharge port 19, the lateral dimension of the lower end portion 19d including the lower side 19a, that is, the opening width thereof is larger than the lateral opening width of the upper end portion 19e.
As shown in FIGS. 1 and 2, the rake face 21a and the cutting edge 3 of the cutting insert 2 are arranged on the leading end side in the discharge direction of the lower end portion 19d including the lower side 19a of the coolant discharge port 19. As shown in FIGS.

As shown in FIG. 4, the coolant discharge port 19 includes a portion 19b in which the opening width in the left-right direction increases toward the lower side. In the present embodiment, the coolant discharge port 19 has a semicircular shape that is convex upward when the coolant discharge port 19 is viewed from the discharge direction. That is, the coolant discharge port 19 of the present embodiment has a semicircular hole shape with a semicircular cross section perpendicular to the discharge direction.
The opening area (flow passage cross-sectional area) of the coolant discharge port 19 is smaller than the opening area of the coolant supply port 18 . In the present embodiment, the lateral dimension (maximum width) of the coolant discharge port 19 is the same as the lateral dimension, that is, the diameter (inner diameter) of the coolant supply port 18 .

As shown in FIG. 7 , the communication passage 20 communicates the coolant supply port 18 and the coolant discharge port 19 . The communication channel 20 is arranged between the coolant supply port 18 located at the upstream end of the channel 14 and the coolant discharge port 19 located at the downstream end of the channel 14 . It connects with the coolant discharge port 19 .

The communication channel 20 has a curved portion 20a that smoothly connects the coolant supply port 18 and the coolant discharge port 19 . The curved portion 20a is located on the wall portion of the inner surface of the curved portion 20a on the distal end side in the discharge direction, and as shown in FIG. An outer corner portion 20ab is positioned on the wall portion on the rear end side in the ejection direction of the inner surface of the portion 20a and has a concave curved shape in the cross-sectional view. The inner corner portion 20aa has a convex curved surface, and the outer corner portion 20ab has a concave curved surface.
In this embodiment, in the cross-sectional view shown in FIG. 7, the radius of curvature of the inner corner portion 20aa and the radius of curvature of the outer corner portion 20ab are the same. However, not limited to this, for example, the radius of curvature of the inner corner portion 20aa may be larger than the radius of curvature of the outer corner portion 20ab.

[Clamp member]
As shown in FIGS. 1 and 2, the clamp member 7 is a male screw member in this embodiment, specifically a set screw. The clamp member 7 has a male screw portion on its outer peripheral surface. The male screw portion of the clamp member 7 is screwed into the female screw hole 46 a of the holding portion 46 . Thereby, the clamp member 7 is held by the holding portion 46 . The clamp member 7 extends downward as it goes radially inward. The radially inner end of the clamping member 7 , that is, the tip of the screw contacts the clamping surface 17 of the nozzle portion 12 . By screwing the clamp member 7 into the female screw hole 46a, the clamp member 7 presses the clamp surface 17 from the radial outside. The coolant discharge member 10 is fixed to the holder 4 by being pressed by the clamp member 7 .

[Effects of this embodiment]
To attach the coolant discharge member 10 of this embodiment described above to the holder 4 , the attachment cylinder 11 is inserted into the opening 47 a of the coolant supply path 47 and the clamp surface 17 of the nozzle portion 12 is pressed by the clamp member 7 . The clamp surface 17 is configured by a flat surface or the like that faces radially outward and is inclined with respect to the central axis C of the mounting cylinder 11 . Specifically, the clamp surface 17 has an inclined surface shape positioned radially outward toward the lower side. Therefore, the clamp member 7 presses against the clamp surface 17 to restrict the upward movement of the coolant discharge member 10 and the circumferential rotational movement around the central axis C. As shown in FIG. More specifically, the mounting cylinder 11 is prevented from slipping upward from the opening 47 a of the coolant supply passage 47 by the pressing force applied to the clamp surface 17 . Moreover, the rotation of the nozzle part 12 in the circumferential direction around the central axis C is suppressed. That is, the coolant discharge member 10 can be fixed to the holder 4 in a state of being prevented from slipping off and rotating by a simple configuration and a simple operation of pressing the clamp surface 17 with the clamp member 7 .

Specifically, in this embodiment, the clamp surface 17 is configured by a flat surface arranged on a part of the outer peripheral surface of the nozzle portion 12 . Unlike the present embodiment, for example, compared to a configuration in which fixing screws are inserted into a plurality of through holes vertically penetrating the nozzle portion and screwed to the holder, according to the present embodiment, the coolant is discharged. The outer shape of the member 10 can be kept small, and the structure can be simplified.

More specifically, in the present embodiment, it is not necessary to provide a plurality of through holes in the nozzle section 12 to avoid the flow path 14 inside, and the layout of the flow path 14 does not easily affect the provision of the clamp surface 17 . Further, it is easy to keep the surface area of the clamp surface 17 small while ensuring the pressing force to the clamp surface 17 . Therefore, it is easy to make the nozzle portion 12 compact. In addition, as a result, the amount of material used for forming the coolant discharge member 10 can be reduced.

Further, since the nozzle portion 12 can be made smaller, it is possible to suppress the problem that chips extending from the cutting portion get entangled in the nozzle portion 12 during cutting, and good chip disposability can be maintained. As a result, it is possible to avoid problems such as collection of chips in the machine tool, and to suppress problems such as damage to the machined surface of the work material due to tangled chips. Therefore, according to this embodiment, it is possible to stably improve the machined surface quality of the work material.

Regarding the manufacture of the coolant discharge member 10, unlike the present embodiment, for example, compared to a complicated structure in which a through hole is made in the nozzle portion and screwed to the holder with a plurality of fixing screws, the present embodiment , the number of parts can be reduced, the assembly is easy, and the manufacturing cost can be reduced.

Further, in the present embodiment, the clamp surface 17 is arranged in a portion of the nozzle portion 12 other than the end portion on the tip side in the ejection direction. Specifically, in this embodiment, the clamp surface 17 is arranged on the body portion 15 .
In this case, it is easy to dispose the clamp member 7 that presses the clamp surface 17 and the holding portion 46 apart from the cut portion. Therefore, problems such as chips getting entangled in the clamp member 7 and the holding portion 46 are further suppressed.

Further, in the present embodiment, the clamp surface 17 faces in the horizontal direction when viewed from the discharge direction.
In this case, since the clamp surface 17 faces a direction different from the coolant discharge direction, it is easy to lay out the clamp surface 17 on the nozzle portion 12 . That is, it is easy to provide the inclined clamp surface 17 in the nozzle part 12 while reducing the size of the nozzle part 12 and suppressing the influence on the layout of the flow path 14 .

Further, in the present embodiment, a plurality of clamp surfaces 17 are provided side by side in the circumferential direction around the central axis C. As shown in FIG.
In this case, for example, according to the shape of the holder 4, the shape of the cutting edge 3, cutting conditions, etc., the optimum clamping surface 17 is appropriately selected from a plurality of clamping surfaces 17 arranged in the circumferential direction, and the nozzle portion 12 is clamped. can be used for As a result, the coolant can be efficiently discharged toward the cutting edge 3, and the tool life can be improved. Moreover, chips can be stably divided, good chip disposability can be maintained, and the machined surface quality of the work can be improved.

In addition, in this embodiment, the plurality of clamping surfaces 17 includes a pair of clamping surfaces 17 facing in opposite directions in the radial direction.
In this case, the same coolant discharge member 10 can be used as a common product regardless of whether the indexable cutting tool 1 (cutting tool) is right-handed or left-handed. In other words, the common coolant discharge member 10 can be used for cutting tools with opposite sides. Therefore, the versatility of the coolant discharge member 10 is enhanced, and member management is easy.

Further, in the present embodiment, the nozzle portion 12 tapers toward the tip side in the ejection direction.
In this case, chips traveling from the cut portion toward the nozzle portion 12 are less likely to get entangled with the nozzle portion 12 . Therefore, good chip disposability can be maintained, and the machined surface quality of the work material can be improved more stably. In addition, since the nozzle portion 12 can be made more compact, the amount of material used for forming the nozzle portion 12 can be further reduced.

Further, in the present embodiment, the coolant discharge member 10 is arranged at a position that does not overlap the cutting insert 2 when viewed in the vertical direction.
In this case, the coolant discharge member 10 is prevented from interfering with the work of attaching and detaching the cutting insert 2 to and from the insert mounting seat 5 . That is, the cutting insert 2 can be attached to and detached from the insert mounting seat 5 while the coolant discharge member 10 is attached to the holder 4 . Therefore, the cutting insert 2 can be easily attached and detached.

Further, in this embodiment, the holding portion 46 that holds the clamp member 7 protrudes upward from the top surface 41 of the holder 4 and faces the nozzle portion 12 in the radial direction.
In this case, holder 4 holds clamp member 7 with a simple structure. In addition, the outer shape of the holding portion 46 can be kept small, and it is easy to suppress problems such as chips getting entangled in the holding portion 46 .

Further, in the present embodiment, the holding portion 46 has a radial dimension that decreases toward the upper side, and a dimension in the ejection direction that decreases. That is, the holding portion 46 tapers toward the upper side.
In this case, it is possible to more stably suppress problems such as entanglement of chips in the holding portion 46 .

Further, in the present embodiment, the tip portion of the nozzle portion 12 in the discharge direction overlaps with the relief portion 5c when viewed from above and below.
In this case, since the coolant is discharged to the cutting edge 3 through the recessed portion 5c, it is possible to suppress chips from entering the recessed portion 5c by the discharged coolant. Therefore, it is possible to prevent chips from getting entangled in the relief portion 5c.

Moreover, in this embodiment, the insert fixing structure 6 does not protrude upward from the surface 21 of the cutting insert 2 . Specifically, the lever 61 does not protrude upward from the through hole 24 .
In this case, the coolant discharged from the coolant discharge port 19 toward the cutting edge 3 and the rake face 21 a is prevented from interfering with the insert fixing structure 6 and reaches the cutting edge 3 stably. Therefore, the coolant supply efficiency to the cutting portion is further enhanced.

Further, in this embodiment, the seal member 13 is fitted to the outer peripheral portion of the mounting cylinder 11 .
In this case, coolant is prevented from leaking out of the cutting tool through the outer peripheral portion of the mounting tube 11 . The supply efficiency of coolant is more stably enhanced.

In the coolant discharge member 10 and the indexable cutting tool 1 of the present embodiment, the width of the opening in the horizontal direction at the lower end portion 19d of the coolant discharge port 19 is larger than the width of the opening in the horizontal direction at the upper end portion 19e. A lower end portion 19d of the coolant discharge port 19 includes a lower side 19a extending in the left-right direction. Therefore, by arranging the cutting edge 3 extending in the left-right direction when viewed from the discharge direction on the tip side of the lower end portion 19d of the coolant discharge port 19 in the discharge direction, the coolant can be efficiently supplied to the cutting edge 3. .

Specifically, when the coolant discharge port 19 has the same opening area (cross-sectional area of the flow path), for example, as in the conventional example shown by the two-dot chain line in FIG. In the embodiment, the vertical dimension of the coolant discharge port 19 can be reduced by the dimension H, and the diffusion of the coolant in the vertical direction after discharge can be suppressed. Therefore, according to this embodiment, the performance of cooling the cutting edge 3 by the coolant, the performance of cutting chips, the performance of lubricating the machined surface of the work material, and the like are stably enhanced. That is, the coolant discharged from the coolant discharge port 19 can be efficiently used for cutting.

In addition, when the coolant discharge port 19 has the same opening area, for example, as in the conventional example indicated by the two-dot chain line in FIG. Since the opening width of the coolant discharge port 19 in the horizontal direction can be kept small, the size of the nozzle portion 12 can be easily reduced in the horizontal direction. For this reason, according to this embodiment, it is easy to suppress the problem that the nozzle part 12 is entangled with chips moving from the cutting portion toward the nozzle part 12 along the rake face 21a.

Also, when the coolant discharge port 19 has the same opening area, for example, as in the conventional example shown by the two-dot chain line in FIG. , the discharge pressure and discharge amount of the coolant discharged from the coolant discharge port 19 can be stably increased, and the coolant discharge directivity is also excellent. Therefore, according to this embodiment, the performance of cooling the cutting edge 3 by the coolant, the performance of cutting chips, the performance of lubricating the machined surface of the work material, and the like are stably enhanced.

Further, in this embodiment, as shown in FIG. 4, the coolant discharge port 19 includes a portion 19b in which the opening width in the horizontal direction increases toward the lower side.
In this case, the cross section of the discharged coolant gradually widens in the left-right direction as it goes downward. When the cutting blade 3 is arranged on the tip side of the lower end portion 19d of the coolant discharge port 19 in the discharge direction, the coolant is stably supplied along the length direction of the cutting blade 3 (horizontal direction as viewed from the discharge direction). Easy to spread.

Further, in the present embodiment, the coolant discharge port 19 has a semicircular shape when the coolant discharge port 19 is viewed from the discharge direction.
In this case, the discharge pressure and the discharge amount of the coolant discharged from the coolant discharge port 19 are stably increased, and the coolant discharge directivity is also excellent.

Further, in this embodiment, the coolant supply port 18 is circular.
The opening 47a of the coolant supply path 47 of the holder 4 is generally formed into a circular hole by using a drill, an end mill, or the like. Therefore, when the coolant supply port 18 has a circular hole shape, the coolant can efficiently flow from the coolant supply passage 47 to the coolant supply port 18 . Further, when the mounting cylinder 11 is cylindrical as in the present embodiment, opening the coolant supply port 18 in the lower surface 11b of the mounting cylinder 11 makes it easy to secure a large opening area for the coolant supply port 18 .

Further, in the present embodiment, the opening area of the coolant discharge port 19 is smaller than the opening area of the coolant supply port 18 .
In this case, the flow velocity of the coolant discharged from the coolant discharge port 19 can be increased. It becomes easier for the coolant to stably reach the cutting edge 3, and the performance of cooling the cutting edge 3 by the coolant, the performance of cutting chips, the performance of lubricating the machined surface of the work material, etc. are more stably enhanced.

Further, in this embodiment, the communication passage 20 has a curved portion 20a that smoothly connects the coolant supply port 18 and the coolant discharge port 19 .
In this case, the coolant supply port 18 and the coolant discharge port 19 extending in directions different from each other can be smoothly connected by the curved portion 20a. The pressure loss can be reduced by suppressing the occurrence of convection, turbulence, and the like in the coolant flowing through the flow path 14 . Therefore, the coolant supply efficiency to the cutting edge 3 is further enhanced.

In the present embodiment, the curved portion 20a includes an inner corner portion 20aa that has a convex curved shape when viewed along the central axis C, and an outer corner portion 20ab that has a concave curved shape when viewed along the central axis C. have.
In this case, the convection, turbulence, etc. when the coolant flowing upward along the wall portion of the curved portion 20a on the distal end side in the discharge direction changes its direction toward the distal end side in the discharge direction is generated at the inner corner portion 20aa of the curved portion 20a. can be stably suppressed by
In addition, convection, turbulence, and the like when the coolant flowing upward along the wall portion of the curved portion 20a on the rear end side in the discharge direction changes its direction toward the front end side in the discharge direction may occur at the outer corner portion 20ab of the curved portion 20a. can be stably suppressed by
Therefore, the pressure loss of the coolant flowing through the flow path 14 is stably reduced.

[Other configurations included in the present invention]
It should be noted that the present invention is not limited to the above-described embodiments, and, for example, as described below, changes in configuration can be made without departing from the gist of the present invention. In the drawings of the modified example, the same reference numerals are given to the same constituent elements as in the above-described embodiment, and mainly different points will be described below.

FIG. 9 is a top view showing the coolant discharge member 10A (10) of the first modification of the above embodiment. FIG. 10 is a perspective view showing a part of an indexable cutting tool 1 of a first modification of the above-described embodiment, and this indexable cutting tool 1 includes a coolant discharge member 10A.
As shown in FIG. 9, in the coolant discharge member 10A of the first modified example, the nozzle portion 12 has a plurality of clamp surfaces 17, five in the illustrated example. The plurality of clamping surfaces 17 includes clamping surfaces 17 facing the rear end side (-Y side) in the discharge direction. Also, the plurality of clamp surfaces 17 are arranged to be connected to each other in the circumferential direction. Each clamping surface 17 is planar and has substantially the same circumferential dimension.
Further, as shown in FIG. 10, the holding portion 46 of the holder 4 extends in the horizontal direction when viewed from the vertical direction. In this first modification, the holding portion 46 is arranged adjacent to the rear end side of the nozzle portion 12 in the ejection direction. That is, the holding portion 46 faces the nozzle portion 12 from the rear end side in the ejection direction.

In this first variant, at least one clamping surface 17 faces the rear end side in the discharge direction.
In this case, the clamping surface 17, the holding part 46 and the clamping member 7 can be arranged further away from the cutting site. Specifically, since the holding portion 46 and the clamping member 7 can be arranged on the rear end side of the nozzle portion 12 in the ejection direction, that is, behind the nozzle, it is possible to further suppress chips from reaching the holding portion 46 and the clamping member 7 . Therefore, problems such as entanglement of chips in the holding portion 46 and the clamp member 7 can be more easily suppressed.

Moreover, a plurality of clamp surfaces 17 are arranged to be connected to each other in the circumferential direction.
Unlike the first modification, for example, in the case of a configuration in which a fixing screw is inserted through the through hole of the nozzle portion and screwed to the holder, it is necessary to space the plurality of through holes in the layout so that they do not interfere with each other. . In contrast, according to the present invention, a plurality of clamping surfaces 17 can be connected and arranged in the circumferential direction. Therefore, the area for arranging the plurality of clamp surfaces 17 can be kept small, and the nozzle section 12 can be made more compact.
Then, for example, according to the shape of the holder 4, the shape of the cutting edge 3, the cutting conditions, etc., the optimum clamping surface 17 is appropriately selected from among the plurality of clamping surfaces 17 arranged in the circumferential direction. can be used. That is, by selecting one of the plurality of clamp surfaces 17, the discharge angle around the central axis C for discharging coolant can be adjusted appropriately. As a result, the coolant can be efficiently discharged toward the cutting edge 3, and the tool life can be improved. Moreover, chips can be stably divided, good chip disposability can be maintained, and the machined surface quality of the work can be improved.
In addition, the degree of freedom in layout of the holding portion 46 on the top surface 41 of the holder 4 is increased according to, for example, the difference in size and shape of the cutting insert 2 . That is, by providing a plurality of clamp surfaces 17, the area where the holding portion 46 can be arranged on the holder 4 is widened (the design width is widened).

FIG. 11 is a top view showing a coolant discharge member 10B (10) of a second modification of the above-described embodiment. 12 and 13 are perspective views showing a part of an indexable cutting tool 1 of a second modification of the above-described embodiment, and this indexable cutting tool 1 includes a coolant discharge member 10B.
As shown in FIG. 11, in the coolant discharge member 10B of the second modification, the nozzle portion 12 has a plurality of clamping surfaces 17, and the plurality of clamping surfaces 17 have different circumferential dimensions. Specifically, in this second modification, the plurality of clamping surfaces 17 includes a first clamping surface 17A and a second clamping surface 17B having a smaller circumferential dimension than the first clamping surface 17A. In the illustrated example, a pair of first clamping surfaces 17A are arranged apart from each other in the circumferential direction, and a plurality (three) of second clamping surfaces 17B are arranged between the pair of first clamping surfaces 17A.

According to this second modification, for example, the second clamp surface 17B having a small circumferential dimension allows the coolant to be discharged in the discharge direction, specifically around the central axis C, as shown in FIGS. 12 and 13. The angle can be finely adjusted, and the contact area with the clamp member 7 can be increased by the first clamp surface 17A having a large circumferential dimension to stably increase the pressing force. That is, according to the above configuration, the optimum clamp surfaces 17A and 17B can be appropriately selected and used according to the shape of the holder 4, the shape of the cutting edge 3, the cutting conditions, and the like.

Further, in third to eighth modifications described below, the same effects as those of the above-described embodiment can be obtained.
FIG. 14 is a front view showing the coolant discharge port 19 of the coolant discharge member 10 of the third modification of the above-described embodiment, and more specifically, is a front view of the coolant discharge port 19 viewed from the discharge direction. In this third modification, the coolant discharge port 19 has a triangular shape when the coolant discharge port 19 is viewed from the discharge direction.

FIG. 15 is a front view showing the coolant discharge port 19 of the coolant discharge member 10 of the fourth modification of the above-described embodiment, and more specifically, it is a front view of the coolant discharge port 19 viewed from the discharge direction. . In this fourth modification, the coolant outlet 19 has a trapezoidal shape when the coolant outlet 19 is viewed from the front in the ejection direction.

FIG. 16 is a front view showing the coolant discharge port 19 of the coolant discharge member 10 of the fifth modification of the above-described embodiment, and more specifically, it is a front view of the coolant discharge port 19 viewed from the discharge direction. . In this fifth modification, the lower side 19a of the coolant discharge port 19 has a curved shape extending in the left-right direction. In this fifth modification, an example in which the lower side 19a bulges downward when viewed from the front of the coolant discharge port 19 shown in FIG. It may be recessed so as to be concave.

FIG. 17 is a front view showing the coolant discharge port 19 of the coolant discharge member 10 of the sixth modification of the above-described embodiment. More specifically, FIG. 17 is a front view of the coolant discharge port 19 viewed from the discharge direction. . In this sixth modification, the coolant discharge port 19 includes a portion 19b in which the opening width in the horizontal direction increases toward the lower side and a portion 19c in which the opening width in the horizontal direction is constant in the vertical direction.
In this case, for example, as shown in FIG. 17, the portion 19c is arranged at the lower end portion 19d of the coolant discharge port 19, and the width of the opening in the horizontal direction at the lower end portion 19d is kept constant in the vertical direction. can increase the amount of coolant supplied, and the above effects become more pronounced.

FIG. 18 is a front view showing the coolant discharge port 19 of the coolant discharge member 10 of the seventh modification of the above-described embodiment, and more specifically, it is a front view of the coolant discharge port 19 viewed from the discharge direction. . In this seventh modification, the side portion of a portion 19b of the coolant discharge port 19, in which the opening width in the left-right direction increases toward the lower side, is recessed inside the coolant discharge port 19 when viewed from the discharge direction. form a curve.

FIG. 19 is a front view showing the coolant discharge port 19 of the coolant discharge member 10 of the eighth modification of the above-described embodiment, and more specifically, it is a front view of the coolant discharge port 19 viewed from the discharge direction. . In this eighth modification, a portion 19b of the coolant discharge port 19, in which the opening width in the left-right direction increases toward the lower side, includes a first side portion 19ba having a linear shape when viewed from the discharge direction, and a coolant discharge port 19b. and a second side portion 19bb recessed inside the outlet 19 and forming a concave curve shape.

Moreover, in the above-described embodiment, an example in which the clamp surface 17 is planar was given, but the present invention is not limited to this. The clamping surface 17 may be, for example, concavely curved instead of planar. Also in this case, the clamping surface 17 can be stably pressed by the clamping member 7 as in the case where the clamping surface 17 is planar.

In the above-described embodiment, an example was given in which the clamp member 7 is a set screw that is screwed and held by the holding portion 46 of the holder 4, but the present invention is not limited to this. Although not shown, the clamp member may be, for example, a wedge member or the like that is held by the holder 4 and configured to press the clamp surface 17 .

In the above-described embodiment, an example was given in which the holding portion 46 tapers toward the upper side, but the present invention is not limited to this. The holding portion 46 may have, for example, constant outer dimensions along the vertical direction.
Moreover, although the example which the main-body part 15 of the nozzle part 12 has the substantially hemispherical shape which becomes convex towards the upper side was mentioned, it does not restrict to this. The main body portion 15 may have, for example, a polygonal columnar shape, a columnar shape, or the like.

In the above-described embodiment, an example in which the lateral dimension of the coolant discharge port 19 is the same as the lateral dimension, ie, the diameter, of the coolant supply port 18 was given, but the present invention is not limited to this. The lateral dimension of the coolant discharge port 19 may be smaller than the diameter of the coolant supply port 18 . Also, the lateral dimension of the coolant discharge port 19 may be larger than the diameter of the coolant supply port 18 . However, also in this case, the opening area (flow path cross-sectional area) of the coolant discharge port 19 is preferably smaller than the opening area of the coolant supply port 18 .

In the above-described embodiment, an example was given in which the insert fixing structure 6 was of the lever lock type, but the present invention is not limited to this. Although not shown, the insert fixing structure 6 may be, for example, a countersunk screw that is inserted into the through hole 24 of the cutting insert 2 and screwed into the female screw hole of the insert mounting seat 5 .

In the above-described embodiment, an example in which the cutting insert 2 has a rectangular plate shape was given, but the shape is not limited to this. The cutting insert 2 may have, for example, a polygonal plate shape other than a rectangular plate shape, a disk shape, or the like.

Although not shown, the holder 4 may be a head-exchangeable holder having a shank portion extending in the tool axial direction and a head member detachably fixed to the tool tip portion of the shank portion. In this case, the insert mounting seat 5, the cutting insert 2, the insert fixing structure 6, the holding portion 46, the opening 47a, the coolant discharge member 10 and the clamp member 7 are provided in the head member.

In the above-described embodiment, the nozzle portion 12 extends in the direction perpendicular to the central axis C, so that the discharge direction is one of the radial directions, but this is not the only option. That is, the nozzle portion 12 may extend in a direction intersecting the central axis C, or may extend in a direction inclined with respect to the central axis C. In this case, the inclined direction corresponds to the ejection direction. Specifically, the discharge direction in which the nozzle portion 12 extends includes, for example, a direction of inclination downward as it goes radially outward from the central axis C, and the like.

The present invention may combine the configurations described in the above-described embodiments and modifications without departing from the gist of the present invention, and addition, omission, replacement, and other modifications of the configuration are possible. . Moreover, the present invention is not limited by the above-described embodiments and the like, but is limited only by the scope of the claims.

ADVANTAGE OF THE INVENTION According to the coolant discharge member and the indexable cutting tool of this invention, an outer shape can be suppressed small and a structure can be simplified. Therefore, it has industrial applicability.

DESCRIPTION OF SYMBOLS 1... Cutting edge replaceable cutting tool 2... Cutting insert 3... Cutting blade 4... Holder 5... Insert mounting seat 7... Clamp member 10, 10A, 10B... Coolant discharge member 11... Mounting tube 12... Nozzle part 14... Flow path 17... Clamp surface 41 ... top surface (top surface of holder)
46... Holding portion 47... Coolant supply path 47a... Opening C... Central axis

Claims (11)

A coolant discharge member attached to a holder having a coolant supply path and discharging coolant supplied from the coolant supply path toward a cutting edge,
a mounting cylinder inserted into the opening of the coolant supply path and extending vertically along the central axis;
a nozzle portion connected to the upper portion of the mounting cylinder and extending in a discharge direction intersecting the central axis;
a flow path extending over the interior of the mounting cylinder and the interior of the nozzle portion, through which the coolant flows;
the nozzle portion has a clamp surface facing outward in a radial direction orthogonal to the central axis and pressed by a clamp member held by the holder;
wherein the clamping surface is an inclined surface positioned radially outward toward the lower side;
Coolant discharge member. The clamp surface is arranged in a portion of the nozzle portion other than the end portion on the tip side in the ejection direction.
The coolant discharge member according to claim 1. The clamp surface faces in the horizontal direction orthogonal to the vertical direction when viewed from the ejection direction.
The coolant discharge member according to claim 1 or 2. The clamp surface faces the rear end side in the discharge direction,
The coolant discharge member according to any one of claims 1 to 3. A plurality of the clamping surfaces are provided side by side in a circumferential direction around the central axis,
The coolant discharge member according to any one of claims 1 to 4. wherein the plurality of clamping surfaces includes a pair of clamping surfaces facing opposite to each other in the radial direction;
The coolant discharge member according to claim 5. wherein the plurality of clamping surfaces are arranged so as to be connected to each other in the circumferential direction;
The coolant discharge member according to claim 5 or 6. The plurality of clamping surfaces have different circumferential dimensions,
The coolant discharge member according to any one of claims 5 to 7. The nozzle portion tapers toward the tip side in the ejection direction,
The coolant discharge member according to any one of claims 1 to 8. a cutting insert having the cutting edge;
the holder having an insert mounting seat to which the cutting insert is detachably mounted;
a coolant discharge member according to any one of claims 1 to 9;
and the clamping member that clamps the coolant discharge member,
The coolant discharge member is arranged at a position not overlapping the cutting insert when viewed from the vertical direction.
Indexable cutting tool. The holder has a holding portion that holds the clamp member,
The holding portion protrudes upward from the upper surface of the holder and faces the nozzle portion in a radial direction.
The indexable cutting tool according to claim 10.

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