JP6555605B1 - Blade-replaceable rolling tool body and blade-replaceable rolling tool - Google Patents

Abstract

An object of the present invention is to provide a body for a cutting edge exchangeable rolling tool capable of improving a cooling capacity. The body 20 has a tip seat 22A for mounting a cutting insert 40A for drilling, a supply portion 28A for supplying coolant from the outside, and a coolant supplied from the supply portion 28A inside the body 20 for flowing the coolant. A flow path to be formed and an injection portion 24A communicating with the chip seat are formed in order to bring the coolant that has flowed through the flow path into contact with the side surface or the bottom surface of the cutting insert 40A facing the chip seat 22A. [Selection] Figure 1

Description

  The present invention relates to a body for a blade-tip-exchangeable rolling tool and a blade-tip-exchangeable rolling tool.

  2. Description of the Related Art Conventionally, a technique is known in which coolant is injected from the tip of a tool body (also referred to as a holder or a body) in order to cool a cutting edge of a cutting edge exchange type rolling tool such as a cutting edge exchange type drill. The coolant sprayed from the tip of the tool body flows through the gap between the bottom surface of the hole formed by a drill or the like and the tool tip surface, and is supplied to the cutting edge.

  Further, a technique is known in which a coolant injection port is formed on the wall surface of a chip discharge groove and the coolant is sprayed toward the cutting edge.

  Patent Document 1 discloses a technique for spraying coolant from a first coolant liquid ejection hole toward a tip cutting edge in a drill.

  Patent Document 2 discloses a drill insert that ensures chip discharge and suppresses the generation of cracks due to chip abrasion.

Japanese Utility Model 1-64319 microfilm JP 2018-47532 A

  However, the conventional cooling methods have insufficient cooling capacity.

  Then, an object of this invention is to provide the body for cutting-blade replacement | exchange type cutting tools and a cutting-blade replacement | exchange-type cutting tool with a higher cooling effect than before.

  The cutting edge replaceable rolling tool body according to one aspect of the present disclosure can have a cutting insert attached to the tip. Then, the work can be machined by rotating around the rotation axis. In this body, a chip seat for attaching a cutting insert and a supply part for supplying coolant from the outside are formed. In addition, a flow path for flowing the coolant supplied from the supply unit is formed inside the body. Further, when the cutting insert is attached, the second injection portion for bringing the coolant into contact with the exposed end face of the cutting insert and the coolant flowing through the flow path are brought into contact with the side surface or the bottom surface of the cutting insert facing the chip seat. Therefore, an injection part communicating with the tip seat is formed. A supply part and an injection | pouring part are comprised from the hole opened on the surface of a body, for example. The injection unit may directly inject the coolant toward the end surface of the cutting insert, or the injection unit may be formed on the tip surface and the coolant that has collided with the processing surface may be brought into contact with the end surface of the cutting insert.

  Moreover, you may form the groove | channel for flowing a coolant along the bottom face of a cutting insert in the seat surface which opposes the bottom face of the cutting insert of a chip seat.

  In addition, the cutting edge replaceable rolling tool body according to another aspect of the present disclosure can have a cutting insert attached to the tip. Then, the work can be machined by rotating around the rotation axis. This body has a tip seat for attaching a cutting insert. Further, when the cutting insert is attached, an injection portion communicating with the chip seat is formed in order to make the coolant flowing through the inside of the body contact the side surface or the bottom surface of the cutting insert facing the chip seat. Furthermore, in order to make the coolant which distribute | circulated the inside of a body contact the end surface of a cutting insert, the injection part connected to the front end surface of a body is formed. A supply part and an injection | pouring part are comprised from the hole opened on the surface of a body, for example.

  Moreover, the blade-tip-exchangeable rolling tool according to one aspect of the present disclosure includes a blade-tip-exchangeable rolling tool body and a cutting insert.

Perspective view of blade-type replaceable drill Right side view of body for replaceable blade drill Left side view of body for replaceable drill

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments are exemplifications for explaining the present invention, and are not intended to limit the present invention only to the embodiments.

  The present invention can be variously modified without departing from the gist thereof. For example, the present invention may be applied by removing or modifying some additional components in an embodiment within the ordinary creation ability of those skilled in the art.

  FIG. 1 is a perspective view of a blade 10 replaceable drill 10. 2 and 3 are a right side view and a left side view, respectively, when the front view of the body 20 with the cutting inserts 40A and 40B removed is a front view, and FIG. When the cutting insert 40A is attached, it corresponds to an end view seen from the direction facing the end face 40A1, and FIG. 3 shows a cutting insert when a seating surface 22B3 or a cutting insert 40B described later is attached. This corresponds to an end view seen from the direction facing the end face of 40B.

  The drill 10 includes a body 20 and two cutting inserts 40 </ b> A and 40 </ b> B attached to the tip of the body 20.

  The body 20 is configured to be rotatable about a rotation axis AX, and includes a cylindrical base end portion 20B and a front end portion 20A configured integrally with the base end portion 20B and gripping the cutting inserts 40A and 40B. Is done.

  As shown in FIG. 2, a tip seat 22A for gripping the cutting insert 40A is formed at the end of the distal end portion 20A in the rotation axis AX direction. The tip seat 22A has a wall surface 22A1 facing the rotation axis AX, that is, the front end direction of the body 20, a wall surface 22A2 facing the rotation axis AX, that is, the wall surface 22A2 facing the outer diameter direction of the body 20, and the rotation shaft. A seating surface 22A3 that is perpendicular to AX and faces the traveling direction in which the body 20 rotates is provided. Further, the connecting portion connecting the seating surface 22A3 and the wall surface 22A1 and the connecting portion connecting the seating surface 22A3 and the wall surface 22A2 are respectively formed with a sash 22A5 and a sash 22A6 formed so as to be recessed inwardly around the body 20. Is formed. In addition, a screw hole 22A4 that opens substantially perpendicularly to the seating surface 22A3 is formed at the center of the seating surface 22A3. As illustrated in FIG. 2, the surface facing the predetermined direction is not limited to a plane whose normal is the direction, and is generally a plane facing the predetermined direction or a curved surface. That means.

  On the other hand, as shown in FIG. 1, the cutting insert 40 </ b> A has an end surface 40 </ b> A <b> 1 that functions as a rake surface and faces the rotation direction, a side surface 40 </ b> A <b> 2 that functions as a flank surface and faces the rotation axis AX, and a side surface facing the outer diameter direction. 40A3, a side surface 40A4 facing the direction of the base end 20B, a side surface 40A5 facing the inner diameter direction, and a bottom surface. Further, a cutting edge is formed at the connection portion between the end face 40A1 and the side face 40A2. Further, the cutting insert 40A is formed with a through-hole penetrating the center portion thereof.

  As shown in the figure, the male screw passing through the through hole is screwed with the female screw formed in the screw hole 22A4, and the end face of the cutting insert 40A is pressed in the direction of the seating surface 22A3 with the head of the male screw. The cutting insert 40 </ b> A can be attached to the body 20.

  When the cutting insert 40A is attached to the body 20, the side surface 40A4 abuts (or is sufficiently close to) the wall surface 22A1. Further, the side surface 40A5 facing the inner diameter direction is in contact with (or sufficiently close to) the wall surface 22A2. Further, the bottom surface of the cutting insert 40A comes into contact with the seating surface 22A3. Further, since the relief 22A5 and the relief 22A6 are formed, each ridge line connecting the bottom surface of the cutting insert 40A and the side surface 40A4 and the side surface 40A5 and the surface of the tip seat 22A are opposed to each other. For this reason, it can suppress that a ridgeline is damaged. In the present embodiment, the tip seat 22A further includes a wall portion 22A7. For this reason, the side surface 40A3 facing the outer diameter direction of the cutting insert 40A is supported by the wall portion.

  Further, as shown in FIG. 2, the body 20 is formed with an injection portion 24 </ b> A for injecting and contacting the coolant flowing inside the body 20 toward the side surface and the bottom surface of the cutting insert 40 </ b> A. The injection portion 24A is formed as an opening hole that communicates with the seat surface 22A3 of the tip seat 22A. As shown in this figure, the injection unit 24A is located in the end surface viewed from the direction facing the seating surface 22A3 (on the rotation axis AX side (in the region where the tip seat 22A exists in the outer diameter direction perpendicular to the rotation axis AX). It is formed on the rotation axis AX side from the midpoint) and on the base end 20B side (region on the base end 20B side from the midpoint of the area where the tip seat 22A exists in the rotation axis AX direction). . For this reason, when the cutting insert 40A is attached, a part of the region on the rotation axis AX side and the base end portion 20B side of the bottom surface of the cutting insert 40A faces the injection unit 24A.

  Furthermore, the injection part 24A or the flow path connected to the injection part 24A is formed so as to include an intersection where the wall surfaces 22A1, 22A2, and the seating surface 22A3 extend. For this reason, 24 A of injection parts are connected also to the stencil 22A5 and the stagnation 22A6. When the cutting insert 40A is attached, the thinning 22A5 and the thinning 22A6 are opposed to a part of the two side surfaces 40A4 and 40A5 of the cutting insert 40A, respectively. Therefore, the coolant injected from the injection unit 24A comes into contact with part of the bottom surface of the cutting insert 40A and part of the two side surfaces 40A4 and 40A5.

  Further, as shown in the figure, a groove 26A1 and a groove 26A2 communicating with the injection portion 24A are formed on the seat surface 22A3, and a groove 26A3 communicating with the groove 26A2 is further formed. The groove 26A1 is formed so as to extend from the injection portion 24A in the direction of the rotation axis AX, and communicates with the distal end surface 20A5 (FIG. 1) of the body 20. The groove 26 </ b> A <b> 2 is formed to extend in the diagonal direction and communicates with the front end surface 20 </ b> A <b> 5 of the body 20. Further, since the groove 26A3 is formed so as to be separated from each other substantially parallel to the groove 26A1, the groove 26A3 communicates with the distal end surface 20A5 of the body 20 in the same manner as the groove 26A1. However, the groove 26A3 and the groove 26A2 are formed in the middle through the screw hole 22A4. Further, when the groove is further formed and viewed from the direction facing the seating surface 22A3, the seating surface 22A3 is divided into four parts in a direction perpendicular to and parallel to the rotation axis AX (the rotation axis AX of the seating surface 22A3). And a straight line passing through the midpoint in the direction perpendicular to the rotation axis AX and a straight line passing through the midpoint in the direction parallel to the rotation axis AX and perpendicular to the rotation axis AX). At least one groove may be formed in each region.

  Next, other configurations of the body 20 will be described. As shown in FIG. 1, the outer side surface 20A1 including an outer surface exposed in the outer diameter direction of the distal end portion 20A includes a curved surface having a constant arc centered on the rotation axis in a cross section perpendicular to the rotation axis AX. And a second take-up surface 20A2 that is connected to the outer surface 20A1 and is connected to the wall surface 20A4 by gradually decreasing the distance from the rotation axis AX in a cross section perpendicular to the rotation axis AX. Furthermore, when the cutting insert 40A is attached to the wall surface 20A4 formed in the same direction as the wall surface 22A2 so as to connect the wall surface 22A2 and the second picking surface 20A2 when viewed from the front end, the end surface 40A1 is substantially the same. A chip discharge groove 27 is formed from a wall surface 20A3 formed facing the rotation direction of the body 20 so as to extend in the same direction as the base end portion 20B. As shown in the figure, the chip discharge groove 27 is formed to be twisted so as to advance in the direction opposite to the rotation direction as it approaches the base end portion 20B.

  In the rear end surface of the body 20 facing the direction opposite to the rotation axis AX, an opening hole including a supply portion 28A for supplying coolant is formed. Further, a first flow path is formed inside the body 20 so as to connect the supply unit 28A and the injection unit 24A. The first flow path is formed by twisting along the chip discharge groove 27 below the wall surface 20A3 and becomes a flow path perpendicular to the seating surface 22A3 in the vicinity of the injection section 24A and connected to the injection section 24A. .

  Further, a second injection portion 32 formed of an opening hole is formed on the front end surface 20A5 of the body 20. Moreover, the 2nd injection part 32 is connected to a 1st flow path by the 3rd flow path. For this reason, the coolant supplied from the supply unit 28A passes through the first flow path, and a part thereof is injected from the injection unit 24A toward the seat surface 22A3, and the other part is supplied from the second injection unit 32 to the rotation axis AX. Spray in the direction.

  Hereinafter, regarding the chip seat 22B formed at the tip of the body 20 and the cutting insert 40B attached to the chip seat 22B, the same numbers are given to the constituent elements that perform the same functions as the chip seat 22A and the cutting insert 40A. Thus, the detailed description will be simplified, and different parts will be mainly described.

  Similarly to the tip seat 22A, the tip seat 22B includes a wall surface 22B1, a wall surface 22B2, a seat surface 22B3, a screw hole 22B4, a fillet 22B5, and a fillet 22B6. Further, a third injection part 24B and grooves 26B1 to 26B2 are formed. However, as shown in FIG. 3, the grooves 26B1 and 26B2 are different from the grooves 26A1 to 26A3. Specifically, the groove 26B1 communicates with the third injection portion 24B, extends in the diagonal direction of the seat surface 22B3 via the screw hole 22B4, and communicates with the distal end surface 20A5. Further, the groove 26B2 communicates with the screw hole 22B4 and the tip surface 20A5. Thus, by forming the groove 26B1 connecting the third injection portion 24B and the screw hole 22B4, the coolant can be circulated along the screw groove formed in the screw hole 22B4. It becomes possible to distribute the coolant through the gap between the male screw for fixing 40B and the cutting insert 40B. In addition, a part of the coolant can be allowed to flow into the groove 26B2.

  As with the cutting insert 40A, the cutting insert 40B includes an end surface that functions as a rake face, a side surface that functions as a flank, two side surfaces that contact and face the wall surface 22B1 and the wall surface 22B2 of the chip seat 22B, and the chip seat 22B. A bottom surface abutting on the surface. However, the cutting edge of the cutting insert 40A functions as a center blade, while the cutting edge of the cutting insert 40B functions as an outer peripheral blade. For this reason, as shown in FIG. 1, the cutting edge of the cutting insert 40A is formed so as to be able to machine the central portion of the hole passing through the rotation axis AX in the end view, while the cutting edge of the cutting insert 40B is The outer peripheral portion of the hole and the wall surface are formed so as to be machined in the end view. Therefore, the tip seat 22A and the tip seat 22B have different shapes, and the seat surface 22A3 and the seat surface 22B3 have different shapes.

  In the rear end surface of the body 20 facing the direction opposite to the rotation axis AX, an opening hole made of a second supply portion for supplying coolant is formed. In addition, a second flow path that connects the second supply unit and the third injection unit 24B is formed inside the body 20. The second flow path is formed below the chip discharge groove corresponding to the cutting insert 40B while proceeding in the direction of the rotation axis AX from the second supply unit, and in the second flow path immediately before the third injection unit 24B, It is formed perpendicular to the seating surface 22B3.

  Hereinafter, the operation and effect when the work material is processed using the drill 10 configured by attaching the cutting insert 40A and the cutting insert 40B to the body 20 as described above will be described.

  A cutting insert 40A and a cutting insert 40B attached to the body 20 are also connected by connecting the body 20 to a machining center or the like on which a rotation driving body (not shown) represented by an electric motor or the like is mounted and rotating about the rotation axis AX. It can be rotated around the rotation axis AX. Further, a coolant (not shown) for supplying liquid coolant such as water or cutting oil is connected to the supply unit 28A to supply the coolant, whereby the coolant can be circulated in the first flow path inside the body 20. it can. Similarly, the coolant can be circulated in the second flow path of the body 20 by connecting the pump to the second supply unit and supplying the coolant. However, the coolant may be supplied from a single supply unit by branching the first supply unit to form the second flow path.

  Part of the coolant that has flowed through the first flow path is injected from the second injection unit 32 through the third flow path that communicates therewith. Since the coolant passing through the third flow path generally proceeds in the direction of the rotation axis AX, the flow velocity is higher than that of the coolant flowing out from the injection section 24A. For this reason, chips generated by vigorously injecting the coolant toward the processing surface processed by the cutting edge of the cutting insert 40A can be discharged. Moreover, since at least a part of the coolant that has collided with the surface of the work is directed toward the end surface 40A1 of the cutting insert 40A, the region on the end surface 40A1 side of the cutting insert 40 can be cooled. A part of the coolant that has flowed through the first flow path is injected from the injection unit 24A. Here, since the first flow path immediately before the injection unit 24A is formed perpendicular to the seating surface 22A3, the coolant is injected in a direction substantially perpendicular to the seating surface 22A3, thereby cooling the bottom surface of the cutting insert 40A. Therefore, the cutting insert 40A can be cooled from both sides of the end surface 40A1 side exposed to the outside and the bottom side facing the chip seat 22A.

  Further, since the injection portion 24A communicates with the groove 26A1 and the groove 26A2, a part of the coolant flows into the groove 26A1 and the groove 26A2 and flows out while taking heat from the bottom surface of the cutting insert 40A. Further, since the groove 26A3 communicates with the groove 26A2, the coolant also flows into these. In addition, since the injection portion 24A is formed on the rotation axis AX side, the region where the bottom surface of the cutting insert 40A needs to be cooled can be uniformly cooled using centrifugal force. Furthermore, since a part of the coolant flows into the screw hole 22A4, the heat of the cutting insert can be taken from the surface of the screw hole 22A4 facing the male screw that fixes the cutting insert 40A. Further, since the injection portion 24A communicates with the fillet 22A5 and the fillet 22A6, a part of the coolant also flows into the fillet 22A5 and the fillet 22A6, and the side surface 40A4 and the side surface 40A5 of the cutting insert 40A can be cooled. . In addition, an injection part may be formed in wall surface 20A4 so that coolant may contact the end surface 40A1 or cutting edge of cutting insert 40A directly, and a coolant may make it advance diagonally.

  Thereafter, the coolant flows from the side surface 40A3 of the cutting insert 40A into the chip discharge groove 27 and is discharged. Since the wall portion 22A7 covers only a part of the side surface 40A3, the coolant can be promoted to flow into the chip discharge groove 27.

  Similarly, the coolant that has flowed in the second flow path is injected from the third injection portion 24B in a direction substantially perpendicular to the seating surface 22B3, cools the bottom surface of the cutting insert 40B, flows into the groove 26B1, and then enters the cutting insert. It flows out while taking heat from the bottom of 40B. Further, since the groove 26B1 advances in the diagonal direction on the seating surface 22B3, the coolant can flow out toward the wall surface of the hole. Accordingly, it is possible to help discharge chips generated by processing the wall surface of the hole with the outer peripheral blade.

  As described above, according to the body 20 and the drill 10 for the cutting edge-replaceable rolling tool described above, the cutting insert 40A is cooled from the end face 40A1 side by the coolant discharged from the second injection portion 32 opened toward the tip. At the same time, the cutting insert 40A can be cooled from the bottom surface side by the coolant injected from the injection portion 24A on the bottom surface side of the chip seat 22A. Thus, by simultaneously cooling from two directions, the cutting insert 40A can be uniformly cooled in a shorter time than before.

  In interrupted machining, when the cutting edge during idling is rapidly cooled by coolant, or when a part of the cutting edge is locally cooled, thermal cracks occur due to thermal shock and the tool life is reduced. There is. However, in the case of the blade replacement type drill according to the present embodiment, coolant is also supplied from the injection portion 24A formed on the seating surface 22A3, so that the side surface 40A4 and the side surface 40A5 of the cutting insert 40A, the bottom surface, and the through hole for passing through the male screw The side of the can be cooled. Therefore, it is possible to suppress the cooling of only the cutting edge of the cutting insert 40A, and to reduce the temperature difference between the cutting edge of the cutting insert 40A and other parts as compared with the conventional case. Therefore, the occurrence of thermal cracks can be suppressed. The same applies to the cutting insert 40B.

  In addition, without forming the grooves 26A1 to 26A3, coolant is circulated through the gaps between the wall surface 22A1 and the wall surface 22A2 of the tip seat 22A and the side surface 40A4 and the side surface 40A5 of the cutting insert 40A, as in the case of the fillets 22A5 and 22A6. It may be. In that case, you may form injection part 24A so that coolant may not be injected to seat surface 22A3, but side 40A4 or side 40A5 may be injected.

  Further, the outer shape of the cutting insert and the shape of the cutting insert such as a chip breaker formed on the upper surface of the cutting insert are not limited to this embodiment, and the present invention is applied to cutting inserts for a wide variety of other drilling tools. It is possible. Similarly, the wall surface and the like of the chip seat can be deformed according to the outline shape of the cutting insert. Furthermore, the present invention can also be applied to other turning tools such as a milling cutter and an end mill.

DESCRIPTION OF SYMBOLS 10 ... Drill, 20 ... Body, 20A ... Tip part, 20A1 ... Outer side surface, 20A2 ... Second picking surface, 20A3 ... Wall surface, 20A4 ... Wall surface, 20A5 ... Tip end surface, 20B ... Base end part, 22A ... Tip seat, 22A1 Wall surface, 22A2 ... Wall surface, 22A3 ... Seat surface, 22A4 ... Hole, 22A5 ... Nuts, 22A6 ... Nuts, 22A7 ... Wall portion, 22B ... Tip seat, 22B1 ... Wall surface, 22B2 ... Wall surface, 22B3 ... Seat surface, 22B4 ... Screw Hole, 24A ... injection section, 24B ... third injection section, 26A1-26A3 ... groove, 26B1-26B2 ... groove, 27 ... chip discharge groove, 28A ... supply section, 32 ... second injection section, 40A, 40B ... cutting Insert, 40A1 ... end face, 40A2-40A5 ... side

Claims (6)

A body that rotates about a rotation axis,
In the body,
A tip seat for mounting the cutting insert;
A supply section for supplying coolant from the outside;
A flow path formed inside the body for flowing the coolant supplied from the supply unit;
A second injection part formed on the body to bring the coolant that has flowed through the flow path into contact with the exposed end surface of the cutting insert;
In order to bring the coolant that has flowed through the flow path into contact with the bottom surface of the cutting insert that faces the chip seat, an injection unit that communicates with the seat surface of the chip seat that faces the bottom surface of the cutting insert;
In order to attach the cutting insert to the chip seat, a screw hole provided to be opened in the seat surface of the chip seat is formed,
In the seat surface, a groove is formed to connect the injection portion and the screw hole, and flow the coolant that has flowed through the injection portion along the bottom surface of the cutting insert ,
The tip seat has a first wall surface facing the front end direction of the body, a second wall surface facing the outer diameter direction of the body, and the seat surface facing the bottom surface of the cutting insert, facing the rotation direction of the body. With
The injection unit is formed to communicate with any of the first wall surface, the second wall surface, and the seat surface,
In the body,
A second tip seat for mounting the second cutting insert;
A second supply unit for supplying a liquid coolant from the outside;
A second flow path formed inside the body for flowing the coolant supplied from the second supply unit;
A third injection portion communicating with the second tip seat is formed to contact the coolant flowing through the second flow path with a side surface or a bottom surface of the second cutting insert facing the second tip seat;
A second seat surface of the second tip seat facing the bottom surface of the second cutting insert communicates with the third injection portion, and a second for flowing the coolant along the bottom surface of the second cutting insert. 2 grooves are formed,
The groove is formed to communicate with the front end surface of the body,
The second groove is formed to communicate with a side surface of the body.
Body for exchangeable cutting tool. The injection unit is formed on the rotary shaft side of the tip seat,
The body for a cutting edge exchangeable turning tool according to claim 1. A body that rotates about a rotation axis,
In the body,
A tip seat for mounting the cutting insert;
A supply section for supplying coolant from the outside;
A flow path formed inside the body for flowing the coolant supplied from the supply unit;
A second injection part formed on the body to bring the coolant that has flowed through the flow path into contact with the exposed end surface of the cutting insert;
In order to bring the coolant that has flowed through the flow path into contact with the bottom surface of the cutting insert that faces the chip seat, an injection unit that communicates with the seat surface of the chip seat that faces the bottom surface of the cutting insert;
In order to attach the cutting insert to the chip seat, a screw hole provided to be opened in the seat surface of the chip seat is formed,
In the seat surface, a groove is formed to connect the injection portion and the screw hole, and flow the coolant that has flowed through the injection portion along the bottom surface of the cutting insert,
The tip seat has a first wall surface facing the front end direction of the body, a second wall surface facing the outer diameter direction of the body, and the seat surface facing the bottom surface of the cutting insert, facing the rotation direction of the body. With
The injection unit is formed to communicate with any of the first wall surface, the second wall surface, and the seat surface.
Body for exchangeable cutting tool. A body that rotates about a rotation axis,
In the body,
A tip seat for mounting the cutting insert;
A supply section for supplying coolant from the outside;
A flow path formed inside the body for flowing the coolant supplied from the supply unit;
A second injection part formed on the body to bring the coolant that has flowed through the flow path into contact with the exposed end surface of the cutting insert;
In order to bring the coolant that has flowed through the flow path into contact with the bottom surface of the cutting insert that faces the chip seat, an injection unit that communicates with the seat surface of the chip seat that faces the bottom surface of the cutting insert;
In order to attach the cutting insert to the chip seat, a screw hole provided to be opened in the seat surface of the chip seat is formed,
In the seat surface, a groove is formed to connect the injection portion and the screw hole, and flow the coolant that has flowed through the injection portion along the bottom surface of the cutting insert,
In the body,
A second tip seat for mounting the second cutting insert;
A second supply unit for supplying a liquid coolant from the outside;
A second flow path formed inside the body for flowing the coolant supplied from the second supply unit;
A third injection portion communicating with the second tip seat is formed to contact the coolant flowing through the second flow path with a side surface or a bottom surface of the second cutting insert facing the second tip seat;
A second seat surface of the second tip seat facing the bottom surface of the second cutting insert communicates with the third injection portion, and a second for flowing the coolant along the bottom surface of the second cutting insert. 2 grooves are formed,
The groove is formed to communicate with the front end surface of the body,
The second groove is formed to communicate with a side surface of the body.
Body for exchangeable cutting tool. The flow path is formed so that the coolant injected from the second injection portion has a velocity component in a direction from the base end to the tip end of the body,
The cutting edge replaceable cutting tool body according to any one of claims 1 to 4, wherein the flow path is formed so that coolant injected from the injection portion has a velocity component in a rotation direction of the body. A cutting edge replaceable rolling tool body according to any one of claims 1 to 5,
A cutting edge exchangeable rolling tool comprising the cutting insert.

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