WO2018016412A1

WO2018016412A1 - Cutting tool

Info

Publication number: WO2018016412A1
Application number: PCT/JP2017/025519
Authority: WO
Inventors: 今井　康晴
Original assignee: 三菱マテリアル株式会社
Priority date: 2016-07-21
Filing date: 2017-07-13
Publication date: 2018-01-25
Also published as: JP6874292B2; JP2018012171A

Abstract

To prevent coolant leakage, facilitate coolant reaching the vicinity of a cutting edge, and to enable coolant to be efficiently supplied to a flank and the cutting edge. A cutting tool provided with a coolant jetting member 37 detachably provided to a distal-end part of a tool body, wherein the coolant jetting member 37 is provided with a flank jetting part 44 in which a first jetting hole 51 opening toward a flank and a cutting edge is formed, and a cylinder part 43 formed in a cylindrical shape and internally communicated with the first jetting hole 51 and a coolant supply channel, a flow channel being formed in the coolant jetting member 37 by the insides of the first jetting hole 51 and the cylinder part 43, the cross-sectional shape of an inflow port 43a connected to the coolant supply channel in the cylinder part 43 and the cross-sectional shape of an outflow port 51a positioned in an end part on the opposite side of the first jetting hole 51 from the cylinder part 43 being mutually different in the flow channel, and the cross-sectional area of the outflow port 51a in the flow channel being smaller than the cross-sectional area of the inflow port 43a.

Description

Part-Time Job

The present invention relates to a cutting tool having a structure for supplying coolant in the vicinity of a cutting edge.

As a conventional cutting tool, for example, a cutting edge exchanging tool shown in Patent Document 1 below is known. The blade-tip-exchangeable cutting tool includes an axial tool body and a plate-shaped cutting insert that is detachably attached to the tip of the tool body. The cutting insert has a rake face, a flank face, and a cutting edge formed at a cross ridge line portion between the rake face and the flank face.

In addition, an oil hole (coolant supply passage) through which coolant (oil-based or water-soluble cutting fluid) flows is formed inside the tool body, and a plate-like member having a recess is attached to the tip of the tool body. It has been. Then, the coolant is ejected from the oil hole through the recess of the plate member toward the flank and the cutting edge from the direction parallel to the flank of the cutting insert. Such a coolant jetting method is called a so-called jet coolant method or JC method.

According to the jet coolant method, for example, external coolant or internal coolant can be made less susceptible to chips compared to the case of supplying coolant from the rake face toward the cutting edge. It becomes easier to reach the cutting edge. For this reason, it is possible to increase the cooling efficiency of the cutting edge, and to expect a longer insert life and higher efficiency of the cutting process.

JP-A-10-76404

However, in the above-described conventional cutting edge-exchangeable cutting tool, the coolant leaks in an unintended direction from between the tip of the tool body and the plate-like member. For this reason, the coolant cannot be efficiently supplied to the flank and the cutting edge, and there is room for improvement in this respect.
In some cases, a predetermined cutting insert is selected from a plurality of types of cutting inserts having different cutting edge shapes, such as the size of the nose R, and mounted on the tool body for turning. In such a case, it has been difficult to supply coolant accurately and stably to the flank and cutting edge of each cutting insert having various cutting edge shapes.
In addition, depending on the type of cutting, it has also been required to stably supply the coolant with high accuracy to predetermined portions of the flank and the cutting edge.

Also, there was room for improvement in terms of making it easier for the coolant to reach the vicinity of the cutting edge.

The present invention has been made in view of such circumstances, and can prevent coolant from leaking out, facilitate the coolant to reach the vicinity of the cutting edge, and efficiently supply the coolant to the flank and cutting edge. The purpose is to provide bytes.

One aspect of the present invention is a tool main body having a shaft shape and having a coolant supply passage formed therein, and a cut formed at a cross ridge line portion between a rake face and a flank face. A cutting tool including a blade and a coolant jetting member detachably provided at a tip of the tool body, wherein the coolant jetting member opens to the flank and the cutting blade. A flank jet part formed with a jet hole, and a cylindrical part that has a cylindrical shape and communicates with the first jet hole and the coolant supply path; and in the coolant jet member, A flow path is formed by one ejection hole and the inside of the cylindrical portion, and the cross-sectional shape of the inlet connected to the coolant supply path in the cylindrical portion of the flow path, and the first ejection hole Located at the end opposite the tube And a cross-sectional shape of the outlet, are different from each other, the flow path, as compared to the cross-sectional area of said inlet, and wherein the cross-sectional area of the outlet is small.

According to the cutting tool of the present invention, the coolant spray member is disposed at the tip of the tool body, and the coolant flowing through the coolant supply path in the tool body is in the cylinder portion of the coolant spray member and the first spray hole. And is ejected toward the flank and cutting edge.
In other words, since the first ejection hole in the flank ejection portion of the coolant ejection member and the coolant supply path communicate with each other via the cylindrical portion, the coolant is directed in an unintended direction from a portion other than the first ejection hole. Leakage is prevented.

More specifically, since the cylindrical portion of the coolant jet member surrounds the coolant flowing inside by the peripheral wall of the cylindrical portion, leakage of the coolant from the peripheral wall to the outside is prevented. Further, the first ejection hole of the coolant ejection member is, for example, a “hole” that opens in a V shape, unlike a notch such as a recess of the conventional plate-like member described in Patent Document 1 described above. And has an annular opening periphery. By forming such an annular opening peripheral edge, leakage of coolant from a portion other than the ejection hole is prevented.

As described above, in the coolant ejection member, the flow path from the connection portion with the coolant supply path in the cylinder portion to the first ejection hole is formed in a sealed shape except for the openings (inlet and outlet) at both ends of the flow path. Therefore, it is possible to reliably prevent unintended leakage of the coolant.
Therefore, according to the present invention, a sufficient amount of coolant can be efficiently supplied to the flank and the cutting edge without increasing the amount of coolant supplied.

Moreover, since the coolant ejection member is detachably provided at the tip portion of the tool body, the following remarkable effects are obtained.
For example, when a cutting insert having a cutting edge is detachably attached to the tip of the tool body (in the case of a cutting edge exchangeable cutting tool), various cutting edge shapes and types of cutting processing of multiple types of cutting inserts Corresponding to (hereinafter abbreviated as cutting edge shape and the like), it is possible to prepare a plurality of types of coolant ejection members having different shapes, arrangements, sizes, etc. of the first ejection holes. And the coolant injection member which has a predetermined 1st injection hole suitable for the predetermined cutting-edge shape of a cutting insert from these coolant injection members can be selected, and it can mount | wear with a tool main body.

That is, it is possible to appropriately select and use the coolant ejection member having the first ejection hole having an optimum shape corresponding to various cutting edge shapes and the like.
Therefore, the coolant can be supplied accurately and stably toward the flank and the cutting edge regardless of the shape of the cutting edge.

In addition, among the flow paths formed in the coolant ejection member, the cross-sectional shape of the inlet connected to the coolant supply path in the cylindrical portion and the end opposite to the cylindrical portion in the first ejection hole (that is, the cutting edge) The cross-sectional shapes of the outlets located at the end of the side are different from each other.
For this reason, for example, the cross-sectional shape of the inflow port is a circular shape that can be easily connected to the coolant supply passage and is easy to manufacture, and the cross-sectional shape of the outflow port is a V shape, a straight line shape, a curved shape corresponding to the cutting edge shape. For example, the coolant can be efficiently supplied to the cutting edge.

Moreover, since the cross-sectional area of the outflow port is smaller than the cross-sectional area of the inflow port in the flow path of the coolant ejection member, the flow rate of the coolant flowing through the outflow port is made higher than the flow rate of the coolant flowing through the inflow port. be able to. As a result, the coolant ejected from the outlet of the first ejection hole can easily enter the slight gap between the work material and the flank and can easily reach the cutting edge. Can be raised remarkably. Therefore, there are effects such as improvement of cutting accuracy, high efficiency of cutting, and extension of tool life (long life).

Moreover, in the cutting tool, the cross-sectional shape of the inflow port is a circular shape, and the cross-sectional shape of the outflow port is any one of a V shape, a linear shape, and a curved shape corresponding to the shape of the cutting edge. Is preferred.

In this case, since the cross-sectional shape of the inlet of the flow path is circular, the flow path is easy to connect to the coolant supply path and is easy to manufacture. In addition, since the cross-sectional shape of the outlet of the flow path is one of a V shape, a straight line shape, and a curved shape corresponding to the shape of the cutting edge, the coolant with the increased flow velocity as described above is used as the cutting edge. It can be supplied efficiently (without waste) and accurately.

Further, in the bite, it is preferable that a cross-sectional area of the flow path in the first ejection hole is constant from a connection portion with the inside of the cylindrical portion to the outlet.

In this case, the cross-sectional area of the flow path of the first ejection hole is constant between the connection portion with the inside of the cylindrical portion in the first ejection hole and the outlet. Therefore, the coolant flowing in the first ejection hole does not cause turbulent flow (causes pressure loss) from the connection portion with the cylindrical portion in the first ejection hole to the outlet. Without) and being ejected toward the flank and cutting edge while maintaining a high flow rate. Thereby, the effect mentioned above becomes still more remarkable.

The term “the cross-sectional area of the flow path is constant” as used in the present invention means that a draft angle (drawing taper) that is imparted in the manufacture in order to pull out the mold for forming the first injection hole during manufacture of the coolant injection member. ) Is defined. Specifically, the ratio of the size of the cross-sectional area at the outlet to the size of the cross-sectional area at the connection portion with the inside of the cylindrical portion in the flow path of the first ejection hole is in the range of 100 to 120%. This is defined as “the cross-sectional area of the flow path is constant”.

Moreover, in the cutting tool, it is preferable that the cross-sectional area of the flow path inside the cylindrical portion becomes smaller from the inflow port toward the connection portion with the first ejection hole.

In this case, the coolant flowing inside the cylindrical portion gradually increases the flow velocity toward the first ejection hole, and after flowing into the first ejection hole, the flow velocity is increased most. Then, the coolant is ejected toward the flank and the cutting edge while the flow velocity is most increased.

In other words, according to the above configuration, the flow path in the coolant ejection member is not expanded after being narrowed, for example, as in the prior art, so that the pressure loss of the coolant flowing through the flow path in the coolant ejection member flows. The coolant supply efficiency is remarkably increased by keeping the entire area from the inlet to the outlet small.

Moreover, in the cutting tool, it is preferable that the flow path has a smaller width of the outlet than the width of the inlet.

In this case, since the width of the outlet is smaller than the width of the inlet (width of the cross section of the channel) in the flow path of the coolant jetting member, the pressure loss of the coolant flowing through the flow path is more effectively suppressed. Can do. And the flow rate of the coolant which distribute | circulates an outflow port can be remarkably raised rather than the flow rate of the coolant which distribute | circulates an inflow port, and a coolant can be made to reach a cutting edge reliably.

Further, in the cutting tool, the cylindrical portion extends from the first ejection hole to the cutting edge side as it goes from the connection portion with the coolant supply path to at least one of the tip side and the side of the tool body. It is preferable to extend inclined.

In this case, the cylinder part of the coolant ejection member extends in an inclined manner, and the cylinder part and the coolant supply path, and the cylinder part and the first ejection hole are connected at a gentle angle so as to intersect each obtuse angle. The pressure loss of the coolant flowing inside these can be reduced. Accordingly, it is possible to prevent the coolant supply pressure from being reduced or the flow velocity from being lowered inside the cutting tool, and to further increase the efficiency of supplying the coolant to the flank and the cutting edge.

In the cutting tool, a rake face jetting portion is provided at a tip portion of the tool main body. The rake face jetting portion includes a second jetting hole that communicates with the coolant supply path and opens toward the rake face and the cutting edge. It is preferred that

In this case, the tip portion of the tool body is provided with a rake face ejection portion, and the coolant flowing through the coolant supply passage in the tool body passes through the second ejection hole of the rake face ejection portion, and the rake face and the cutting edge. It is ejected toward the blade.

Accordingly, the coolant can be supplied from the first ejection hole of the flank ejection portion of the coolant ejection member toward the flank and the cutting edge, and the rake surface and the cutting edge can be supplied from the second ejection hole of the rake surface ejection section. Coolant can be supplied toward
That is, since coolant can be supplied toward the cutting edge from two different directions (on the rake face and the flank face) out of the directions orthogonal to the cutting edge (the blade length direction), The coolant can be surely reached, and the cooling effect in the vicinity of the cutting edge can be remarkably enhanced.

According to the cutting tool of the present invention, the coolant can be prevented from leaking out, and the coolant can be easily reached near the cutting edge, so that the coolant can be efficiently supplied to the flank and the cutting edge.

It is a perspective view which shows the blade-tip-exchange-type cutting tool concerning 1st Embodiment of this invention. It is a top view of a blade-tip-exchange-type tool. It is a side view of a blade-tip-exchange-type tool. It is a perspective view which expands and shows the principal part of a blade-tip-exchange-type cutting tool. It is a top view which expands and shows the principal part of a blade-tip-exchange-type cutting tool. It is a side view which expands and shows the principal part of a blade-tip-exchange-type cutting tool. It is a front view which expands and shows the principal part of a blade-tip-exchange-type cutting tool. It is a top view which shows a coolant ejection member. It is a front view which shows a coolant ejection member. It is a bottom view which shows a coolant ejection member. It is a side view which shows a coolant ejection member. It is a figure which shows B arrow of FIG. FIG. 10 is a view showing an AA cross section of FIG. 9. It is a figure which shows the DD cross section of FIG. It is a perspective view which expands and shows the principal part of the blade-tip-exchange-type cutting tool which concerns on 2nd Embodiment of this invention. It is a top view which expands and shows the principal part of a blade-tip-exchange-type cutting tool. It is a side view which expands and shows the principal part of a blade-tip-exchange-type cutting tool. It is a front view which expands and shows the principal part of a blade-tip-exchange-type cutting tool.

<First Embodiment>
Hereinafter, the cutting edge replaceable cutting tool 30, which is a cutting tool according to the first embodiment of the present invention, will be described with reference to FIGS.
The cutting edge replaceable cutting tool 30 of this embodiment is a turning tool (cutting tool) that performs a turning process (cutting process) on a work material made of a metal material or the like.

[Schematic configuration of cutting edge replaceable tool]
As shown in FIG. 1 to FIG. 7, the cutting edge replaceable cutting tool 30 includes, for example, a cutting insert 1 made of cemented carbide or the like, and a tool body 31 made of steel or the like to which the cutting insert 1 is detachably mounted. I have.
The tool main body 31 has an axial shape. The cutting insert 1 has a plate shape and is disposed on an insert mounting seat 32 formed at the tip of the tool body 31. Further, the cutting insert 1 includes a rake face 7, a flank face 8, and a cutting edge 5 formed at a cross ridge line portion between the rake face 7 and the flank face 8. The cutting edge 5 is disposed so as to protrude from the tip of the tool body 31.

The work material to be turned by the cutting edge replaceable cutting tool 30 of the present embodiment has, for example, a shaft shape, a column shape, a disk shape, or the like. At the time of turning, the cutting edge 5 of the cutting edge replaceable cutting tool 30 is brought into contact with the processing portion (working surface) of the work material while rotating the work material in the direction of rotation of the work material around its central axis. Cut into the work material.
The cutting edge replaceable cutting tool 30 performs peripheral surface processing on the outer peripheral surface and inner peripheral surface of the work material, and performs end surface processing on the end surface facing the central axis direction of the work material.

(Tool body)
In the example of the present embodiment, the tool main body 31 has a rectangular bar shape, and a cross section perpendicular to the axis O is formed in a square shape. Of both end portions along the axis O direction of the tool body 31, one end portion (tip end portion) is disposed close to the processing surface of the work material at the time of cutting, and portions other than the one end portion including the other end portion are: It is detachably attached to a machine tool (not shown).

A coolant supply path 36 is formed inside the tool body 31 (see FIGS. 4 to 7).
In addition, the tool body 31 has a distal end portion that is larger in size in the width direction and the height direction in the direction perpendicular to the axis O than a portion other than the distal end portion (square bar-shaped body portion). ing.

A concave insert mounting seat 32 to which the cutting insert 1 is detachably attached, and a clamp piece 33 and a clamp screw 34 (clamp) for fixing (clamping) the cutting insert 1 to the insert mounting seat 32 are attached to the tip of the tool body 31. Mechanism), a coolant ejection member 37 that is detachably provided at the tip, and a recess that is formed in a recess at the tip and communicates with the coolant supply path 36 and in which the coolant spray member 37 is disposed (accommodated). 38.

[Definition of orientation used in this embodiment]
In this embodiment, the direction (direction along the axis O) in which the axis O of the tool main body 31 of the cutting edge replaceable cutting tool 30 extends is referred to as the axis O direction. Of the axis O direction, the direction from the end (one end) where the cutting insert 1 is disposed in the tool body 31 to the end (the other end) supported by the machine tool is referred to as the base end side. The opposite direction is called the tip side.

A direction perpendicular to the axis O of the tool body 31 is referred to as a tool radial direction. Of the tool radial direction, the direction in which the rake face 7 of the cutting insert 1 faces is referred to as “upward”, the opposite direction is referred to as “downward”, and the direction perpendicular to the upper and lower (up and down directions) is referred to as “side”. The vertical direction of the tool may be referred to as the height direction, and the side of the tool may be referred to as the width direction.
However, at the time of turning, the tool main body 31 of the cutting edge replaceable cutting tool 30 is mounted on the machine tool such that the rake face 7 of the cutting insert 1 disposed on the insert mounting seat 32 faces downward in the vertical direction. The
In addition, a direction around the axis O of the tool body 31 is referred to as a tool circumferential direction.

The direction (direction along the insert axis) in which the insert axis of the cutting insert 1 (the central axis of the mounting hole 6 locked to the clamp piece 33) extends is referred to as the insert axis direction.
Moreover, the direction orthogonal to the insert axis is referred to as the insert radial direction, and the direction around the insert axis is referred to as the insert circumferential direction.
In the example of this embodiment, the insert axis of the cutting insert 1 is slightly inclined with respect to the vertical direction of the tool body 31.

(Insert mounting seat)
4 to 7, the insert mounting seat 32 has a concave shape corresponding to the shape of the cutting insert 1. In the example of the present embodiment, the insert mounting seat 32 corresponds to the cutting insert 1 having a substantially rhombic rectangular plate shape, the tip end of the tool main body 31 in the direction of the axis O, upward, In addition, a substantially rhomboid quadrangular hole that opens toward one side (one of them) is formed.

The insert mounting seat 32 is detachably mounted on the bottom wall formed substantially parallel to the seating surface of the cutting insert 1 (the back surface 3b of the front and back surfaces 3 facing the insert axial direction in the cutting insert 1). The sheet member 35 is provided between the bottom wall and the cutting insert 1 and has a pair of side walls that contact the outer peripheral surface 4 of the cutting insert 1.

The bottom wall of the insert mounting seat 32 has a substantially rhomboid quadrangular surface shape, and the pair of side walls of the insert mounting seat 32 has a substantially rectangular quadrangular surface shape. The pair of side walls intersect (connect) so as to form an acute angle that is concave between each other, and perpendicularly intersect the bottom wall and rise from the bottom wall.

The sheet member 35 is formed of, for example, a cemented carbide. The sheet member 35 has a substantially rhombic square plate shape. Of the front and back surfaces of the sheet member 35, the back surface is in contact with the bottom wall of the insert mounting seat 32. Of the front and back surfaces of the sheet member 35, the front surface is a mounting surface on which the seating surface (back surface 3 b) of the cutting insert 1 is seated.

The sheet member 35 is attached to the bottom wall of the insert mounting seat 32 by a countersunk screw or the like (not shown). In the example of the present embodiment, the lower portion of the outer peripheral surface of the sheet member 35 is inclined inward in the insert radial direction as it goes downward.
In addition, a coolant guide recess 39 is formed in a portion of the outer peripheral surface of the sheet member 35 that is located immediately above a first ejection hole 51 described later of the coolant ejection member 37. The width along the insert circumferential direction of the coolant guide recess 39 becomes narrower as it goes upward. Further, the depth of the coolant guide recess 39 along the insert radial direction becomes shallower as it goes upward.

[Clamp mechanism]
The cutting edge replaceable cutting tool 30 includes a clamp mechanism including a clamp piece 33 and a clamp screw 34. The clamp piece 33 is formed with a claw portion that is inserted into the mounting hole 6 penetrating the cutting insert 1 in the insert axial direction and is locked to the inner peripheral surface of the mounting hole 6. The clamp piece 33 is formed with a through hole into which the clamp screw 34 is inserted. The clamp screw 34 inserted into the through hole is screwed into a female screw hole formed at the distal end portion of the tool body 31. Worn.

By inserting the clamp screw 34 into the female screw hole of the tool body 31, the clamp piece 33 presses the cutting insert 1 toward the sheet member 35 of the insert mounting seat 32, and the cutting insert 1 is inserted into the insert mounting seat 32. Are pressed toward the pair of side walls (toward the inside of the tool body 31). Accordingly, the clamp mechanism regulates the movement of the cutting insert 1 relative to the insert mounting seat 32 and clamps (fixes) the cutting insert 1.

[Coolant supply path]
The coolant supply path 36 is a coolant (oil-based or water-soluble cutting fluid) channel formed inside the tool body 31. The coolant supply path 36 is connected to a coolant supply means (not shown) provided outside the cutting edge replaceable cutting tool 30.

In the example of this embodiment, the coolant supply path 36 is disposed at the tip of the tool body 31. The coolant supply path 36 communicates with the main coolant supply path 36a connected to the coolant supply means, the main coolant supply path 36a, the sub-coolant supply path 36b having a smaller inner diameter than the main coolant supply path 36a, It has. The cross-sectional shape of the main coolant supply passage 36a (the shape of the cross section perpendicular to the extending direction of the flow passage) and the cross-sectional shape of the sub-coolant supply passage 36b are each circular. The cross-sectional area of the sub coolant supply path 36b is smaller than the cross-sectional area of the main coolant supply path 36a.

In the example of the present embodiment, a plurality of (two in the illustrated example) sub-coolant supply paths 36 b are formed at the distal end portion of the tool body 31 so as to branch from the main coolant supply path 36 a. In the coolant supply path 36, the coolant flows into the sub coolant supply path 36b through the main coolant supply path 36a.
The sub coolant supply path 36b can be rephrased as a small diameter coolant supply path 36b or a downstream coolant supply path 36b, and the main coolant supply path 36a can be rephrased as a large diameter coolant supply path 36a or an upstream coolant supply path 36a. .

The main coolant supply path 36 a extends in the vertical direction in the tool body 31 and opens on the lower surface of the tool body 31. In the illustrated example, the upper end portion of the main coolant supply path 36a is formed with a smaller diameter than the portion other than the upper end portion.
The sub coolant supply path 36b is connected to the upper end portion of the main coolant supply path 36a and extends upward from the upper end portion.

[Receiving recess]
The accommodating recess 38 is formed in a concave shape at the distal end portion of the tool main body 31 corresponding to the shape of the coolant ejection member 37.
In FIG. 4, the accommodating recess 38 communicates with the coolant supply path 36, communicates with the hole 41 into which a later-described cylinder 43 of the coolant ejection member 37 is inserted, and the coolant supply path of the hole 41. And a recess 42 disposed adjacent to the side opposite to the side 36. The hole portion 41 is formed in a hole shape corresponding to the cylindrical portion 43 of the coolant ejection member 37, and the recess portion 42 is formed in a recess shape corresponding to the attachment portion 40 of the coolant ejection member 37.

The hole 41 has a circular hole shape. The hole 41 is connected to the main coolant supply path 36a of the coolant supply path 36, and the tool is moved from the connecting portion with the main coolant supply path 36a toward at least one of the tip side and the side of the tool body 31. The main body 31 extends obliquely upward. In the example of the present embodiment, the hole 41 is inclined upward as it goes toward the tip side and the side of the tool body 31 (that is, the direction inclined with respect to the axis O in the top view of the tool body 31). Yes.

The hollow portion 42 has a concave shape that opens to the tip side, the side, and the upper side (the bottom wall of the insert mounting seat 32) in the direction of the axis O in the tip portion of the tool body 31. Although not particularly illustrated, the shape of the portion where the recessed portion 42 opens in the bottom wall of the insert mounting seat 32 is V-shaped.

[Coolant injection member]
4 to 7, the coolant ejection member 37 is detachably attached to the distal end portion of the tool body 31 so as to be accommodated in the accommodation recess 38. In the example of the present embodiment, the coolant ejection member 37 is fixed to the distal end portion of the tool main body 31 with an attachment screw 45.
The coolant ejection member 37 is disposed adjacent to the flank 8 of the cutting insert 1 on the side opposite to the cutting edge 5 of the flank 8 (from the front surface 3a to the back surface 3b side in the insert axial direction). Yes. The coolant ejection member 37 is disposed adjacent to the lower portion of the insert mounting seat 32 as the housing recess 38 is disposed adjacent to the lower portion of the insert mounting seat 32.

4 and 8 to 14, the coolant ejection member 37 includes a cylindrical portion 43 that is inserted into the hole 41 of the housing recess 38 and an attachment portion 40 that is disposed in the recess 42 of the housing recess 38. I have.
The mounting portion 40 includes a flank ejection portion 44 in which a first ejection hole 51 that opens toward the flank 8 and the cutting edge 5 of the cutting insert 1 is formed. The flank ejection portion 44 is provided in at least a part of the attachment portion 40 (the portion where the first ejection holes 51 are formed), and thus the entire attachment portion 40 may be the flank ejection portion 44. . The cylinder portion 43 has a cylindrical shape, and the inside (internal space) communicates with the first ejection hole 51 and the coolant supply path 36. That is, the first ejection hole 51 of the flank ejection portion 44 and the coolant supply path 36 of the tool body 31 are connected through the inside of the cylindrical portion 43.
A flow path is formed in the coolant ejection member 37 by the first ejection hole 51 and the inside of the cylindrical portion 43.

The mounting portion 40 has a plate shape in which a cross section (cross section) perpendicular to the vertical direction of the tool is V-shaped. A first ejection hole 51 is opened on the upper surface of the attachment portion 40 (flank ejection portion 44). The first ejection holes 51 are formed so as to extend along the insert axial direction and the vertical direction of the tool body 31. As shown in FIG. 8, in the example of the present embodiment, the first ejection holes 51 are arranged at the corners of the upper surface of the attachment portion 40 that forms a V shape.

8 and 13, the end portion (that is, the upper end portion) on the opposite side to the cylinder portion 43 in the first ejection hole 51 is a coolant outlet 51a. The cross-sectional shape of the outflow port 51a (the shape of the cross section perpendicular to the extending direction of the flow path) is any one of a V shape, a linear shape, and a curved shape corresponding to the shape of the cutting edge 5. In the example of the present embodiment, the cutting edge 5 has a V shape, and the cross-sectional shape of the outlet 51a of the first ejection hole 51 has a V shape correspondingly.

8, 13, and 14, the cross-sectional shape of the first ejection hole 51 is constant between the connection portion 51 b of the first ejection hole 51 with the inside of the cylindrical portion 43 and the outlet 51 a. ing. Further, the cross-sectional area of the flow path in the first ejection hole 51 is constant between the connection portion 51b of the first ejection hole 51 with the inside of the cylindrical portion 43 and the outlet 51a.
Note that “the cross-sectional area of the flow path is constant” as used in the present embodiment means that a draft given in the manufacture for pulling out a mold for forming the first injection hole 51 when the coolant injection member 37 is manufactured. It is defined by allowing (drawer taper). Specifically, the ratio of the size of the cross-sectional area at the outlet 51a to the size of the cross-sectional area at the connection portion 51b with the inside of the cylindrical portion 43 in the flow path of the first ejection hole 51 is 100 to The range of 120% is defined as “the cross-sectional area of the flow path is constant”.

The first ejection hole 51 is a coolant channel provided in the flank ejection part 44, and the entire periphery of the channel except for the openings (the outlet 51a and the connection part 51b) at both ends of the channel. It is enclosed and sealed by walls. That is, the first ejection hole 51 is a chamber in which portions other than the upper and lower end portions are surrounded by the wall portion without any gap.

In FIG. 4, a flank 8 is located between the first ejection hole 51 (outlet 51 a thereof) and the cutting edge 5, and the first ejection hole 51 is adjacent to the flank 8. It is arranged.
As shown in FIG. 5, the flank ejection portion 44 and the first ejection hole 51 are located more than the cutting edge 5 of the cutting insert 1 in the tool top view when the tip end portion of the tool body 31 is viewed along the vertical direction. It is arranged on the inner side of the tool body 31 (the base end side in the axis O direction and the inner side of the side).

As shown in FIGS. 4, 9, and 14, the attachment portion 40 is formed with a through hole 49 through which the attachment screw 45 is inserted. The mounting screw 45 is inserted into the through hole 49 and screwed into a female screw hole formed at the tip of the tool body 31, whereby the coolant ejection member 37 is fixed to the tip of the tool body 31.

4 and 8 to 14, the cylindrical portion 43 has a cylindrical shape. The cylinder portion 43 is fitted into the hole portion 41 of the accommodation recess 38. The inside of the cylindrical portion 43 is connected to the main coolant supply path 36 a of the coolant supply path 36. The cylindrical portion 43 extends from the connection portion with the coolant supply path 36 in an inclined manner toward the cutting edge 5 from the first ejection hole 51 as it goes to at least one of the tip side and the side of the tool body 31. ing. In the example of the present embodiment, the cylindrical portion 43 is inclined upward as it goes toward the tip side and the side of the tool body 31 (that is, the direction inclined with respect to the axis O in the top view of the tool body 31). Yes.

In FIG. 13, an end portion (that is, an end portion connected to the coolant supply path 36) opposite to the first ejection hole 51 in the inside (inner peripheral surface) of the cylinder portion 43 is a coolant inlet 43 a. Yes. The inflow port 43 a has a tapered surface shape that increases in diameter as it approaches the coolant supply path 36 along the direction of the central axis C of the cylindrical portion 43.

The cross-sectional shape of the inflow port 43a (the cross-sectional shape perpendicular to the channel extending direction (the direction of the central axis C of the cylindrical portion 43)) is a circular shape. Therefore, among the flow paths formed in the coolant ejection member 37, the cross-sectional shape of the inflow port 43 a connected to the coolant supply path 36 in the cylindrical portion 43, and the flank 8 and the cutting edge 5 in the first ejection hole 51. The cross-sectional shape of the outflow port 51a opening toward each other is different from each other.

12 and 13, the cross-sectional area of the flow path inside the cylindrical portion 43 decreases from the inflow port 43 a inside the cylindrical portion 43 toward the connecting portion 43 b with the first ejection hole 51. In the example of the present embodiment, the cross-sectional area of the flow path inside the cylindrical portion 43 is first gradually reduced toward the first ejection hole 51 along the central axis C direction at the inflow port 43a. In 43b, it is made small gradually as it goes to the 1st ejection hole 51. FIG.

And the flow path formed in the coolant ejection member 37 has a smaller cross-sectional area of the outlet 51a than that of the inlet 43a. 9 and 12, the flow path formed in the coolant ejection member 37 has a smaller width of the outlet 51a than the width of the inlet 43a. The width here refers to the length in the direction perpendicular to the extending direction of the flow path, and specifically refers to the horizontal direction (the left-right direction in FIGS. 9 and 12). It is not limited to the direction.

Although not particularly illustrated, an annular seal member is attached to the outer periphery of the cylindrical portion 43. Specifically, an O-ring made of a resin material or the like is disposed as a seal member in the groove 48 formed on the outer peripheral surface of the cylindrical portion 43. The seal member closely contacts the inner wall of the groove 48 and the inner peripheral surface of the hole 41 of the housing recess 38.

[Rake face ejection part]
As shown in FIGS. 4 to 7, a second ejection hole 52 that communicates with the coolant supply path 36 and opens toward the rake face 7 and the cutting edge 5 is formed at the tip of the tool body 31. A rake face ejection part 50 is provided.

In the example of this embodiment, the rake face ejection part 50 is formed in a protruding shape on the upper surface of the tip part of the tool body 31. Specifically, a cylindrical body protrudes adjacent to the insert mounting seat 32 on the upper surface of the tip portion of the tool body 31, and the cylindrical body serves as a rake face ejection portion 50. Further, a plurality of rake face ejection portions 50 (two in the illustrated example) are provided at the distal end portion of the tool body 31 so as to be separated from each other. For this reason, the second ejection holes 52 are also separated from each other. A plurality are formed.

The second ejection holes 52 are coolant passages provided in the rake face ejection portion 50, and both ends of the passages are open to the outer peripheral surface and the bottom surface of the rake face ejection portion 50. A portion of the second ejection hole 52 that opens to the bottom surface of the rake face ejection portion 50 is connected to the sub-coolant supply passage 36b of the coolant supply passage 36, and this connection portion serves as a coolant inlet. . Moreover, the part opened to the outer peripheral surface of the rake face ejection part 50 among the 2nd ejection holes 52 is made into the outflow port of a coolant.

The second ejection hole 52 is hermetically sealed with a wall portion surrounding the entire flow path except for openings at both ends of the flow path (a connection portion with the coolant supply path 36 and an outlet). That is, the second ejection hole 52 is a chamber in which portions other than both end portions thereof are surrounded by the wall portion without a gap.

In the illustrated example, the cross-sectional shape of the second ejection hole 52 is circular. The cross-sectional area of the flow path in the second ejection hole 52 is constant from the connection portion with the coolant supply path 36 in the second ejection hole 52 to the outlet. Further, the cross-sectional area of the flow path of the second ejection hole 52 is smaller than the cross-sectional area of the flow path of the sub-coolant supply path 36b to which the second ejection hole 52 is connected.

The rake face 7 is located between the second ejection hole 52 (outlet thereof) and the cutting edge 5, and the second ejection hole 52 is disposed adjacent to the rake face 7. .
In the example of the present embodiment, of the pair of rake face ejection portions 50, the second ejection hole 52 of one rake face ejection portion 50 located on the distal end side of the tool body 31 and the straight line described later among the cutting edges 5. The rake face 7 is located between the blade 10 and the corner blade 9. Further, the rake face 7 is located between the second ejection hole 52 in the other rake face ejection portion 50 and the straight edge 11 and the corner edge 9 described later of the cutting edge 5.

[Cutting insert]
As shown in FIG. 4 to FIG. 7, the cutting insert 1 includes a plate-shaped insert body 2, front and back surfaces 3 (front surface 3 a and back surface 3 b) of the insert body 2, and peripheral edges of the front and back surfaces 3. The outer peripheral surface 4 to be connected along the direction, the cutting edge 5 formed at the intersecting ridge line portion between the front and back surfaces 3 and the outer peripheral surface 4, and the insert body 2 are formed so as to penetrate the insert axial direction. And an attachment hole 6 that is engaged with the claw portion of the clamp piece 33.

In the example of the present embodiment, the insert main body 2 has a substantially rhombic square plate shape, the front and back surfaces 3 each have a substantially rhombic square surface shape, and the outer peripheral surface 4 has four approximate shapes arranged in the insert circumferential direction. It has a rectangular quadrangular surface.
Each corner portion of the outer peripheral edge of the front and back surfaces 3 of the insert body 2 has a convex curve shape, and among these corner portions, a corner portion located at a pair of acute angle portions of the front and back surfaces 3 having a rhombus shape and the vicinity thereof Is the cutting edge 5. Moreover, the attachment hole 6 is opening in each center part of the front and back 3 (coaxially with an insert axis line).

In the outer peripheral surface 4 of the insert body 2, a portion between the substantially rectangular quadrangular surfaces adjacent to each other in the insert circumferential direction is a convex curved surface (in the illustrated example, a cylindrical body having a convex cross section perpendicular to the insert axis). Part of the outer peripheral surface).

In a state where the cutting insert 1 is mounted on the insert mounting seat 32, at least the cutting edge on the surface 3 a facing the side opposite to the bottom wall of the insert mounting seat 32 (that is, the upper side) of the front and back surfaces 3 of the insert body 2. A portion including a region adjacent to 5 is a rake face 7. Of the front and back surfaces 3 of the insert body 2, the back surface 3 b facing the bottom wall side (that is, the lower side) of the insert mounting seat 32 is a seating surface that contacts the seat member 35.
Further, a portion including at least a region adjacent to the cutting edge 5 in the outer peripheral surface 4 of the insert body 2 is a flank 8.

The cutting insert 1 of the present embodiment is a so-called negative insert in which the flank 8 (outer peripheral surface 4) of the insert body 2 is formed in parallel to the insert axis, but is not limited thereto. That is, the cutting insert 1 may be a so-called positive insert formed so as to be inclined inward in the insert radial direction as the flank 8 is separated from the cutting edge 5 in the insert axial direction.

Further, the cutting insert 1 of the present embodiment is a so-called double-sided insert in which the insert body 2 has a reverse-inverted symmetrical shape, but is not limited thereto. That is, the cutting insert 1 may be a so-called single-sided insert in which the insert body 2 has a non-front / reverse symmetric shape (not a front / reverse symmetric shape).

[Cutting edge]
The cutting edge 5 of the cutting insert 1 is formed at the intersecting ridge line portion between the rake face 7 and the flank face 8. The cutting edge 5 includes a corner blade 9 positioned at a corner portion of the front and back surfaces 3 (corner portion of the rake face 7), and a pair of

linear blades

10, 11 connected to both ends of the corner blade 9 and extending linearly. Have. That is, the cutting edge 5 has a V-shape as a whole by including a corner blade 9 and a pair of

linear blades

10 and 11 continuous at both ends of the corner blade 9. The corner blade 9 is disposed at an intermediate portion (between a pair of straight blades 10 and 11) in the entire length of the cutting blade 5.

The corner blade 9 has a convex curve shape protruding outward in the insert radial direction, and in the example of this embodiment, has a convex arc shape. Of the corner blade 9, a portion (a portion connected to the straight blade 10 in the corner blade 9) located in front of the tool feeding direction and the straight blade 10 during cutting are cut into the processing surface of the work material. Further, a portion of the corner blade 9 located behind the tool feed direction (a portion connected to the straight blade 11 in the corner blade 9) finishes the processed surface of the work material. In addition, you may cut into the processed surface of a workpiece from the linear blade 11 side of the cutting blade 5. FIG.

The

straight blades

10, 11 extend in a tangential direction in contact with both ends of the arcuate corner blade 9, and are connected to the corner blade 9 gently. In addition, an angle formed between the pair of linear blades 10 and 11 (intersection angle between the virtual extension lines of the linear blades 10 and 11) in a top view (insert top view) of the cutting insert 1 viewed from the insert axial direction. ) Is an acute angle smaller than 90 ° in this embodiment, for example, about 80 °.

In addition, the cutting insert 1 of the present embodiment is formed in a line-symmetric shape (mirror image symmetry) with a bisector of an angle formed between the pair of

straight blades

10 and 11 as viewed in the top view of the insert. ing. For this reason, the cutting edge 5 also has a line-symmetric shape with the angle bisector as the axis of symmetry, and the

straight blades

10 and 11 have the same shape and the same blade length. However, the present invention is not limited to this, and the cutting edge 5 may not be formed in a line-symmetric shape with the bisector of the corner as an axis of symmetry (that is, it may be a non-axisymmetric shape). The

straight blades

10 and 11 may have different shapes and blade lengths.
In addition, it is preferable that at least the vicinity of the cutting edge 5 (the cutting edge 5, the rake face 7 and the flank face 8) of the cutting insert 1 is coated with a hard film such as a CVD coating film.

Although not particularly shown, the first ejection hole 51 of the coolant ejection member 37 is a region corresponding to the corner blade 9 of the cutting blade 5 and the straight blades 10 and 11 (the corner blade 9 of the cutting blade 5). And just below the straight blades 10 and 11).

[Effects of this embodiment]
According to the cutting edge-exchangeable cutting tool 30 of the present embodiment described above, the coolant injection member 37 is disposed at the tip of the tool body 31, and the coolant flowing through the coolant supply path 36 in the tool body 31 is The coolant is ejected toward the flank 8 and the cutting edge 5 through the cylindrical portion 43 of the coolant ejection member 37 and the first ejection hole 51.
That is, since the first ejection hole 51 in the flank ejection portion 44 of the coolant ejection member 37 and the coolant supply path 36 communicate with each other via the cylinder portion 43, the coolant other than the first ejection hole 51. Leakage from the site in an unintended direction is prevented.

More specifically, since the cylindrical portion 43 of the coolant ejection member 37 surrounds the coolant flowing inside by the peripheral wall of the cylindrical portion 43, leakage of the coolant from the peripheral wall to the outside is prevented. Further, the first ejection hole 51 of the coolant ejection member 37 is different from the conventional notch of the plate-like member described in Patent Document 1 (Japanese Patent Laid-Open No. 10-76404) described above. In the form example, since it is a “hole” that opens in a V shape, it has an annular opening periphery. By forming such an annular opening peripheral edge, leakage of coolant from a portion other than the ejection hole 51 is prevented.

In this way, the coolant ejection member 37 has openings (inlet 43a and outlet 51a) at both ends of the flow path from the connecting portion of the cylinder portion 43 to the coolant supply path 36 to the first ejection holes 51. Except for being hermetically sealed, it is possible to reliably prevent unintended leakage of the coolant.
Therefore, according to the present embodiment, a sufficient amount of coolant can be efficiently supplied to the flank 8 and the cutting edge 5 without increasing the amount of coolant supplied.

Moreover, since the coolant ejection member 37 is detachably provided at the distal end portion of the tool main body 31, the following remarkable effects are obtained.
That is, as in this embodiment, when the cutting insert 1 having the cutting edge 5 is detachably attached to the tip of the tool body 31 (in the case of the blade tip replaceable cutting tool 30), a plurality of types of cutting inserts 1 are used. A plurality of types of coolant ejection members having different shapes, arrangements, sizes, etc. of the first ejection holes 51 corresponding to various shapes of the cutting edges 5 and types of cutting (hereinafter abbreviated as the shapes of the cutting edges 5). 37 can be prepared. Then, a coolant spraying member 37 having a predetermined first spraying hole 51 suitable for the shape of the predetermined cutting edge 5 of the cutting insert 1 is selected from these coolant spraying members 37 and mounted on the tool body 31. be able to.

That is, it is possible to appropriately select and use the coolant ejection member 37 having the first ejection hole 51 having an optimum shape corresponding to various shapes of the cutting edge 5 and the like.
Therefore, the coolant can be accurately and stably supplied toward the flank 8 and the cutting edge 5 regardless of the shape of the cutting edge 5 and the like.

In addition, among the flow paths formed in the coolant ejection member 37, the cross-sectional shape of the inlet 43 a connected to the coolant supply path 36 in the cylindrical portion 43 and the side opposite to the cylindrical portion 43 in the first ejection hole 51 are provided. The cross-sectional shape of the outlet 51a located at the end (that is, the end on the cutting blade 5 side) is different from each other.
Therefore, as described in the present embodiment, for example, the cross-sectional shape of the inflow port 43a is a circular shape that can be easily connected to the coolant supply path 36 and can be easily manufactured, and the cross-sectional shape of the outflow port 51a is the shape of a cutting edge 5 The coolant can be efficiently supplied to the cutting edge 5 in a V shape, a linear shape, a curved shape, or the like corresponding to.

Moreover, since the cross-sectional area of the outflow port 51a is smaller than the cross-sectional area of the inflow port 43a in the flow path of the coolant jetting member 37, the flow rate of the coolant flowing through the inflow port 43a is more circulated. The flow rate of the coolant can be increased. As a result, the coolant ejected from the outlet 51a of the first ejection hole 51 can easily enter a slight gap between the work material and the flank 8 and reach the cutting edge 5 easily. The cooling effect in the vicinity of 5 can be remarkably enhanced. Therefore, there are effects such as improvement of cutting accuracy, high efficiency of cutting, and extension of tool life (long life).

In addition, the cross-sectional shape of the inlet 43a of the flow path of the coolant ejection member 37 is circular, and the cross-sectional shape of the outlet 51a is any of V-shape, linear shape, and curved shape corresponding to the shape of the cutting edge 5. If it is, the following effects are obtained.
That is, in this case, since the cross-sectional shape of the inflow port 43a of the flow path is circular, the flow path is easily connected to the coolant supply path 36 and is easy to manufacture. In addition, since the cross-sectional shape of the outlet 51a of the flow path is any one of a V shape, a straight line shape, and a curved shape corresponding to the shape of the cutting edge 5, the coolant whose flow rate is increased as described above is cut off. The blade 5 can be supplied efficiently (without waste) and accurately.

Moreover, in this embodiment, the cross-sectional area of the flow path of the 1st ejection hole 51 is made constant from the connection part 51b with the inside of the cylinder part 43 in this 1st ejection hole 51 to the outflow port 51a. Yes. Therefore, the coolant flowing inside the first ejection hole 51 does not cause turbulent flow from the connection portion 51b with the cylindrical portion 43 in the first ejection hole 51 to the outlet 51a ( Without causing pressure loss), the air is ejected toward the flank 8 and the cutting edge 5 while maintaining a high flow rate. Thereby, the effect mentioned above becomes still more remarkable.

In the present embodiment, the cross-sectional area of the flow path inside the cylindrical portion 43 decreases from the inflow port 43a inside the cylindrical portion 43 toward the connecting portion 43b with the first ejection hole 51. Has an effect.
That is, in this case, the coolant flowing inside the cylindrical portion 43 gradually increases the flow velocity toward the first ejection hole 51, and after flowing into the first ejection hole 51, the flow velocity is increased most. It will be. Then, the coolant is jetted toward the flank 8 and the cutting edge 5 with the flow velocity being the highest.

That is, according to the above configuration, since the flow path in the coolant ejection member 37 is not expanded after being narrowed, for example, as in the prior art, the pressure loss of the coolant flowing through the flow path in the coolant ejection member 37 is reduced. Is kept small over the entire area from the inlet 43a to the outlet 51a, and the coolant supply efficiency is significantly increased.

Moreover, since the flow path in the coolant ejection member 37 has a smaller width of the outlet 51a than the width of the inlet 43a (width of the cross section of the flow path), the pressure loss of the coolant flowing through the flow path is more effectively reduced. Can be suppressed. And the flow rate of the coolant which distribute | circulates the outflow port 51a can be remarkably raised rather than the flow rate of the coolant which distribute | circulates the inflow port 43a, and a coolant can be made to reach the cutting edge 5 reliably.

Moreover, in this embodiment, the cylinder part 43 goes to the cutting blade 5 side from the 1st ejection hole 51 as it goes to at least any one of the front end side and side of the tool main body 31 from the connection part with the coolant supply path 36. Since it is inclined and extended, the following effects are obtained.
That is, in this case, the cylinder portion 43 of the coolant ejection member 37 extends in an inclined manner so that the cylinder portion 43 and the coolant supply path 36, and the cylinder portion 43 and the first ejection hole 51 intersect each other at an obtuse angle. Connected at a gentle angle, the pressure loss of the coolant flowing inside these can be reduced. As a result, it is possible to prevent the coolant supply pressure from being reduced or the flow velocity from being reduced inside the tool, and the coolant supply efficiency to the flank 8 and the cutting edge 5 can be further increased.

Moreover, in this embodiment, the rake face ejection part 50 in which the tip part of the tool body 31 communicates with the coolant supply path 36 and the second ejection hole 52 opened toward the rake face 7 and the cutting edge 5 is formed. Since it is provided, the following effects are achieved.
In other words, in this case, the rake face ejection part 50 is provided at the tip of the tool body 31, and the coolant flowing through the coolant supply path 36 in the tool body 31 is the second ejection hole of the rake face ejection part 50. Through 52, it is ejected toward the rake face 7 and the cutting edge 5.

Therefore, the coolant can be supplied from the first ejection hole 51 of the flank ejection portion 44 of the coolant ejection member 37 toward the flank 8 and the cutting edge 5, and the second ejection hole 52 of the rake surface ejection portion 50. Therefore, the coolant can be supplied toward the rake face 7 and the cutting edge 5.
That is, the coolant can be supplied toward the cutting edge 5 from two different directions (on the rake face 7 and on the flank face 8) out of the directions orthogonal to the cutting edge 5 (the blade length direction). The coolant can surely reach the blade 5 and the cooling effect in the vicinity of the cutting blade 5 can be remarkably enhanced.

In the present embodiment, the flank 8 is located between the first ejection hole 51 and the cutting edge 5, and the rake face 7 is located between the second ejection hole 52 and the cutting edge 5. Therefore, the following effects are achieved.
That is, in this case, the coolant ejected from the first ejection holes 51 is supplied from the direction substantially orthogonal to the cutting edge 5 through the flank 8. Further, the coolant ejected from the second ejection holes 52 is supplied from the direction substantially orthogonal to the cutting edge 5 through the rake face 7. For this reason, it becomes easy to supply coolant uniformly over the whole blade length of the cutting edge 5, and the cooling effect becomes more stable.

Moreover, in this embodiment, since the rake face ejection part 50 is formed in a protruding shape at the tip of the tool body 31, the second ejection hole 52 of the rake face ejection part 50 is engaged with, for example, a breaker shape or the like. It becomes easy to open straight toward the rake face 7 and the cutting edge 5. For this reason, the coolant ejected from the second ejection holes 52 can reach the rake face 7 and the cutting edge 5 more reliably.

Further, in the present embodiment, a plurality of second ejection holes 52 are formed apart from each other at the tip of the tool body 31, and the second ejection holes 52 are directed toward the rake face 7 and the cutting edge 5. The coolant is ejected. That is, coolant is supplied to the rake face 7 and the cutting edge 5 from a plurality of different directions. Therefore, the coolant can reliably reach the cutting edge 5 regardless of the discharge direction of the chips flowing from the cutting edge 5 onto the rake face 7.

In this embodiment, since an annular seal member such as an O-ring is attached to the outer periphery of the cylindrical portion 43 of the coolant ejection member 37, the coolant can be prevented from unintentionally flowing on the outer periphery of the cylindrical portion 43. At the same time, the coolant can be prevented from leaking to the outside such as the tool tip side or the side. Therefore, the operational effects of the present embodiment described above become more prominent.
Further, since the contact member increases the contact resistance with the hole 41 of the tool main body 31 in which the cylindrical portion 43 is disposed, the coolant ejection member 37 can be easily removed from the tool main body 31 due to the coolant supply pressure or the like. Can be suppressed. In other words, the seal member can prevent the coolant ejection member 37 from coming off, and if this effect can be obtained sufficiently, the mounting screw 45 need not be provided.

In order to obtain the action of preventing the coolant jetting member 37 from coming off without providing the mounting screw 45, the upper surface (at least the inner peripheral edge) of the mounting portion 40 on the extension line along the central axis C direction of the cylindrical portion 43 In addition, it is preferable that the back surface of the sheet member 35 (the back surface 3b of the cutting insert 1 when the sheet member 35 is not provided) is positioned so that these can be contacted.

Further, in the present embodiment, an accommodation recess 38 communicating with the coolant supply path 36 is formed at the tip of the tool body 31, and the coolant jetting member 37 is accommodated in the accommodation recess 38. Play.
In other words, according to the above configuration, the coolant ejection member 37 is housed in the housing recess 38 and is prevented from protruding (projecting) greatly from the tip of the tool body 31.
Therefore, the outer shape of the cutting edge replaceable cutting tool 30 can be reduced to a compact size while the above-described remarkable effects are obtained by the coolant spraying member 37, and the condition of the turning process can be achieved by mounting the coolant spraying member 37. It can also be suppressed.

Further, in the present embodiment, the flank ejection portion 44 and the first ejection hole 51 are more than the cutting blade 5 of the cutting insert 1 in the tool top view when the tip portion of the tool body 31 is viewed along the vertical direction. 31 is disposed on the inner side (the base end side in the axis O direction and the inner side of the side). Therefore, while the excellent effect can be obtained by the first ejection hole 51 as described above, the flank ejection portion 44 can be prevented from interfering with the work material during turning, and the influence on the machining conditions can be prevented. Can be suppressed.

Second Embodiment
Next, a blade edge replaceable cutting tool 60 according to a second embodiment of the present invention will be described with reference to FIGS. 15 to 18.
Detailed description of the same components as those in the first embodiment will be omitted, and only different points will be described below.

[Differences from the previous embodiment]
As shown in FIGS. 15 to 18, the cutting edge replaceable cutting tool 60 of the present embodiment is different from the first embodiment in the sub-coolant supply path 36b of the coolant supply path 36 and the rake face ejection part 50. .

In the present embodiment, only one sub coolant supply path 36b is connected to the main coolant supply path 36a at the tip of the tool body 31, and the sub coolant supply paths 36b have different extending directions. A plurality of linear flow paths are connected to each other.

Further, in the present embodiment, the rake face ejection portion 50 is provided on the clamp piece 33 detachably attached to the tip portion of the tool body 31. That is, only one rake face ejection part 50 is provided at the tip of the tool body 31. And the 2nd ejection hole 52 is opened in the front end surface which faces the cutting-blade 5 side in the clamp piece 33 (rake face ejection part 50). The clamp piece 33 is formed with a plurality of (two in the illustrated example) second ejection holes 52.

Specifically, the second ejection hole 52 is a coolant flow path provided in the clamp piece 33 (rake face ejection portion 50), and both ends of the flow path are connected to the front end surface of the clamp piece 33 and Open to the bottom. A portion of the second ejection hole 52 that opens to the bottom surface of the clamp piece 33 is connected to the sub-coolant supply passage 36b of the coolant supply passage 36, and this connection portion serves as a coolant inlet. Moreover, the part opened to the front end surface of the clamp piece 33 among the 2nd ejection holes 52 is made into the outflow port of a coolant.

The second ejection hole 52 is hermetically sealed with a wall portion around the entire flow path except for openings at both ends of the flow path (a connection portion with the coolant supply path 36 and an outlet). That is, the second ejection hole 52 is a chamber in which portions other than both end portions thereof are surrounded by the wall portion without a gap.
The second ejection holes 52 extend linearly toward the cutting edge 5 in the vicinity of the outlet, and are formed to extend in a curved shape or a straight line in portions other than the vicinity of the outlet.

[Effects of this embodiment]
According to the cutting edge-exchangeable cutting tool 60 of the present embodiment, it is possible to obtain the same operational effects as those of the first embodiment described above.
Furthermore, since the rake face ejection part 50 is provided on the clamp piece 33, the second ejection hole 52 is directed toward the rake face 7 and the cutting edge 5 without increasing the number of parts at the tip of the tool body 31. It can be opened well.

[Other configurations included in the present invention]
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above-described embodiment, the cutting insert 1 is formed in a substantially rhombic square plate shape, but the present invention is not limited to this. That is, the cutting insert 1 may have a polygonal plate shape or a disk shape other than the rectangular plate shape. Further, according to the shape of the cutting edge 5 of various cutting inserts 1, the cross-sectional shape of the first ejection hole 51 (outlet 51a thereof) may be selected from a V shape, a straight shape, and a curved shape. .

In the above-described embodiment, the cross-sectional area of the flow path in the first ejection hole 51 is constant between the connection portion 51b of the first ejection hole 51 with the inside of the cylindrical portion 43 and the outlet 51a. Although there is, it is not limited to this. For example, the cross-sectional area of the flow path of the first ejection hole 51 may be gradually reduced from the connecting portion 51b of the first ejection hole 51 with the inside of the cylindrical portion 43 toward the outlet 51a. In this case, the cross-sectional area of the flow path inside the cylindrical portion 43 may be constant between the inflow port 43 a and the connection portion 43 b with the first ejection hole 51.
Moreover, although the cross-sectional shape of the 1st ejection hole 51 was made constant from the connection part 51b with the inside of the cylinder part 43 in this 1st ejection hole 51 to the outflow port 51a, It is not limited.

Moreover, in the above-mentioned embodiment, although the rake face ejection part 50 was formed in the projection shape in the front-end | tip part of the tool main body 31, the shape of the rake face ejection part 50 is not limited to a projection shape. .

In the above-described embodiment, the cutting insert 1 is made of cemented carbide or the like, and at least the vicinity of the cutting edge 5 (the cutting edge 5, the rake face 7 and the flank face 8) of the outer surface is a hard film such as a CVD coating film. However, the present invention is not limited to this. That is, the cutting insert 1 is, for example, a PCD (polycrystalline diamond) sintered body or a cBN (cubic boron nitride) sintered body in a concave portion formed in a corner portion of a cemented carbide base metal (base). A cutting edge chip made of an ultra-high hardness sintered body may be integrally formed by brazing or the like. In this case, the cutting edge 5, the rake face 7 and the flank face 8 of the cutting insert 1 are formed in a cutting edge tip.

In the above-described embodiment, the sheet member 35 is interposed between the back surface 3b of the cutting insert 1 and the bottom wall of the insert mounting seat 32. However, the sheet member 35 may not be provided. . In this case, the back surface 3 b of the cutting insert 1 is directly seated on the bottom wall of the insert mounting seat 32.

In the above-described embodiment, the cutting edge

exchangeable cutting tools

30 and 60 have been described as examples of the cutting tool. However, the cutting tool is not limited thereto. That is, the present invention can be applied to a cutting tool that is not a blade-tip-exchangeable type, such as a brazing tool.

In addition, in the range which does not deviate from the meaning of this invention, you may combine each structure (component) demonstrated by the above-mentioned embodiment, a modification, and a remark etc., addition of a structure, omission, substitution, others It can be changed. Further, the present invention is not limited by the above-described embodiments, and is limited only by the scope of the claims.

5 Cutting edge 7 Rake face 8

Relief face

30, 60 Cutting edge exchangeable tool (bite)
31 Tool body 36 Coolant supply path 37 Coolant ejection member 43 Cylinder portion 43a Inflow port 43b inside the cylinder portion Connection portion with the first ejection hole inside the cylinder portion 44 Relief surface ejection portion 50 Rake surface ejection portion 51 First 51a Outlet 51a of the first ejection hole 51b Connection portion of the first ejection hole with the inside of the cylindrical portion 52 Second ejection hole

Claims

A tool body having a shaft shape and having a coolant supply path formed therein;
A cutting edge disposed at the tip of the tool body and formed at the crossing ridge line portion of the rake face and the flank face;
A coolant ejection member detachably provided at the tip of the tool body, and a tool comprising:
The coolant ejection member is
A flank jet portion formed with a first jet hole that opens toward the flank and the cutting edge;
A cylindrical portion having an inner portion communicating with the first ejection hole and the coolant supply path,
In the coolant jet member, a flow path is formed by the first jet hole and the inside of the cylindrical portion,
Among the flow paths, a cross-sectional shape of an inflow port connected to the coolant supply path in the cylindrical portion, and a cross-sectional shape of an outflow port located at an end opposite to the cylindrical portion in the first ejection hole, Are different from each other,
The bite characterized in that the channel has a cross-sectional area of the outlet that is smaller than a cross-sectional area of the inlet.
The byte according to claim 1,
The cross-sectional shape of the inlet is a circular shape,
The cutting tool is characterized in that a cross-sectional shape of the outlet is one of a V shape, a straight line shape, and a curved shape corresponding to the shape of the cutting edge.
The byte according to claim 1 or 2,
The cutting tool characterized in that a cross-sectional area of a flow path in the first ejection hole is constant from a connection portion with the inside of the cylindrical portion to the outlet.
The byte according to claim 3,
The cutting tool according to claim 1, wherein a cross-sectional area of the flow path inside the cylindrical portion decreases from the inflow port toward a connection portion with the first ejection hole.
The byte according to any one of claims 1 to 4,
The bite characterized in that the flow path has a width of the outlet that is smaller than a width of the inlet.
The byte according to any one of claims 1 to 5,
The cylindrical portion extends from the first ejection hole to the cutting edge side in an inclined manner from the connecting portion with the coolant supply path toward at least one of the tip side and the side of the tool body. Byte characterized by
The byte according to any one of claims 1 to 6,
The tip of the tool body is provided with a rake face jetting part formed with a second jet hole that communicates with the coolant supply path and opens toward the rake face and the cutting edge. Part-Time Job.