Fixation member and cutting tool

Abstract

To provide a fixation member that satisfactorily feeds a fluid such as coolant or the like into a flow channel of itself and can discharge it from a discharge port to a cutting place, and a cutting tool.SOLUTION: A fixation member 50, which presses and fixes a cutting insert 40 located on an insert attachment part 12 of a tool body 10, has: a fixation member body 51 having a pressing part 55 which presses the cutting insert 40; a fitting projection 52 which is projected from a bottom of the fixation member body 51, and is fitted into a fitting hole 21 formed in the tool body 10; and a coolant introduction flow channel 71, a coolant discharge flow channel 72 and coolant reservoir 73 that guide a coolant fed from a coolant branch flow channel 32 of the tool body 10 to a discharge port 72a formed at a tip of the fixation member body 51 and discharge the coolant. On an outer peripheral surface of the fitting projection 52, an inflow port 74 of the coolant introduction flow channel 71 communicating with an outflow port 26 of the coolant branch flow channel 32 of the tool body 10 is formed.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a fixing member and a cutting tool. [Background technology]

[0002] A cutting tool for cutting a workpiece includes a tool body, a cutting insert disposed on an attachment part of the tool body, and a fixing member for fixing the cutting insert to the tool body (see, for example, Patent Document 1). In this cutting tool, the fixing member is provided with a protrusion that fits into a connecting part consisting of a hole in the tool body, a flow path is formed that opens on the end face of the protrusion, coolant is introduced into the flow path from the opening on the end face of the protrusion, and the coolant is discharged to the cutting location from an outlet at the tip of the fixing member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2018 / 034339 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the flow passage opening at the end face of the protruding part of the fixed member cannot have a large hole diameter, and the cross-sectional area of ​​the flow passage is small. As a result, the coolant is suddenly sent from the tool body to the flow passage of the fixed member, which has a small cross-sectional area, causing a large pressure loss, making it difficult to discharge the coolant from the discharge port.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a fixed member and a cutting tool that can effectively deliver a fluid such as coolant to a flow path in the fixed member and discharge it from an outlet to a cutting location. [Means for solving the problem]

[0006] A fixing member according to one embodiment of the present invention is a fixing member that presses and fixes a cutting insert placed in an insert mounting portion of a tool body, and comprises a fixing member main body having a pressing portion that presses the cutting insert, a fitting protrusion that protrudes from the bottom of the fixing member main body and fits into a fitting hole formed in the tool body, and a flow path that guides fluid fed from the supply path of the tool body to an outlet formed at the tip of the fixing member main body and discharges it, and an inlet of the flow path that communicates with an outlet of the supply path of the tool body is formed on the outer peripheral surface of the fitting protrusion.

[0007] In the fixing member having the above configuration, an inlet communicating with the outlet of the supply passage of the tool body is formed on the outer peripheral surface of the fitting protrusion. Therefore, the hole diameter of the inlet can be made larger than when the inlet of the flow passage is formed on the end surface of the fitting protrusion. This reduces the pressure loss of the fluid sent from the supply passage of the tool body to the flow passage, and allows the fluid to be smoothly discharged from the outlet at the tip of the fixing member body. Therefore, the fluid can be efficiently supplied to the cutting point by the cutting insert for cooling and lubrication. In addition, since there is no inlet on the end surface of the fitting protrusion that is fitted into the fitting hole of the tool body, a spring for detaching the fixing member body from the tool body can be attached to the end of the fitting protrusion.

[0008] The flow path has an inlet flow path on the inlet side, a discharge flow path on the discharge outlet side, and a fluid reservoir provided midway between the inlet flow path and the discharge flow path, and the fluid reservoir may have a flow path cross-section larger than the inlet flow path and the discharge flow path.

[0009] The introduction flow channel may be formed from the inlet toward the fluid reservoir while curving inside the fitting projection.

[0010] A cutting tool according to one embodiment of the present invention comprises the above-mentioned fixing member, a tool body having an insert mounting portion in which a cutting insert is disposed and a fixing member mounting portion to which the fixing member is assembled, and a cutting insert that is disposed in the insert mounting portion and pressed and fixed by the fixing member, and the tool body comprises a fitting hole formed in the fixing member mounting portion into which the fitting protrusion of the fixing member is fitted, and a supply passage formed on the inner surface of the fitting hole and having an outlet communicating with an inlet on the outer surface of the fitting protrusion. Effect of the Invention

[0011] According to the present invention, there is provided a fixed member and a cutting tool that can effectively feed a fluid such as a coolant into a flow passage in the fixed member and discharge the fluid from a discharge port to a cutting location. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a side view of a cutting tool according to the present embodiment. [Diagram 2] FIG. 2 is a perspective view of the tip of the cutting tool according to this embodiment. [Diagram 3] FIG. 3 is a schematic side view of a clamping portion of the cutting insert. [Figure 4] FIG. 4 is a schematic perspective view of a clamping portion of the cutting insert as viewed from behind. [Diagram 5] FIG. 5 is a perspective view of the tip of the tool body with the cutting insert placed in the insert attachment portion. [Figure 6] FIG. 6 is a plan view of the tip of the tool body with the cutting insert disposed in the insert attachment portion. [Figure 7] FIG. 7 is a side view of the fixing member. [Figure 8] FIG. 8 is a perspective view of the fixing member. [Figure 9] FIG. 9 is a front view of the fixing member. [Figure 10] FIG. 10 is a perspective view of the fixing member as viewed from the lower rear. [Figure 11]FIG. 11 is a perspective view seen from the rear surface side of a fixing member having a coil spring attached to the tip of a fitting projection. [Figure 12] FIG. 12 is a plan view of the fixing member illustrating the shape of the fitting projection of the fixing member. [Figure 13] FIG. 13 is a perspective view of the fixing member, showing a state in which the fixing screw is engaged with the engaging recess formed in the fitting protrusion of the fixing member. [Figure 14] FIG. 14 is a side view of a portion of a fixing member having a guide protrusion in front of a fitting projection. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. (cutting tools) 1 to 4, a cutting tool 100 according to this embodiment has a tool body 10 and a cutting insert 40, and the tool body 10 is provided with a fixing member 50 and a fixing screw 23. This cutting tool 100 is a turning tool in which the cutting insert 40 is attached to the tip of the tool body 10 and performs external cutting or internal cutting on a rotating workpiece by the cutting insert 40 at the tip of the tool body 10. The cutting insert 40 is pressed and fixed by the fixing member 50 of the tool body 10.

[0014] (Tool body) The tool body 10 is formed in a prismatic shape, and the cutting insert 40 is attached to the tip of the tool body 10. The tool body 10 has an insert attachment portion 12 at its tip, and the cutting insert 40 is attached to the insert attachment portion 12. The tool body 10 is formed from a metal material such as steel. As the material of the tool body 10, for example, alloy tool steel (SKS5), die steel (SKD61), maraging steel, etc., which have elasticity and are not easily plastically deformed, are preferable. The shape of the tool body 10 is not limited to a prismatic shape.

[0015] The insert mounting portion 12 has a mounting surface 13 and a side wall surface 14 that is provided on the rear side of the mounting surface 13 and is substantially perpendicular to the mounting surface 13. A cutting insert 40 is placed on the mounting surface 13 of the insert mounting portion 12 via a shim 15. Note that a structure in which the cutting insert 40 is placed on the mounting surface 13 without providing the shim 15 may also be used.

[0016] The tool body 10 has a fixed member mounting portion 16 on the rear side of the insert mounting portion 12, and a fixed member 50 is attached to this fixed member mounting portion 16. The fixed member mounting portion 16 has a mounting surface 17 consisting of a flat surface that is connected to the side wall surface 14 of the insert mounting portion 12. The fixed member mounting portion 16 also has a sliding surface 18 on the rear side of the mounting surface 17. This sliding surface 18 is an inclined surface that gradually slopes downward from the mounting surface 17 side toward the rear.

[0017] As shown in Figs. 5 and 6, the fixing member mounting portion 16 has a fitting hole 21 and a female thread 22. The fitting hole 21 is formed perpendicular to the mounting surface 17. The female thread 22 opens to the side of the fitting hole 21 and is formed obliquely toward the fitting hole 21. The female thread 22 communicates with the fitting hole 21 at the inner circumferential surface. A fixing screw 23 is screwed into the female thread 22 from the upper side of the fixing member mounting portion 16, and its tip protrudes into the fitting hole 21. A hollow set screw is used as the fixing screw 23. In this example, a structure in which the fixing screw 23 is screwed into the female thread 22 is illustrated, but instead of the female thread 22, a hole portion communicating with the fitting hole 21 may be formed, and a pressing member such as a pin may be inserted into the hole portion by operating a cam or lever.

[0018] Furthermore, a guide recess 25 is formed on the inner circumferential surface of the fitting hole 21. This guide recess 25 is provided on the opposite side to the insert mounting portion 12, and is formed in a spherical concave shape. Furthermore, an outflow port 26 is formed on the inner circumferential surface of the fitting hole 21. This outflow port 26 is also provided on the opposite side to the insert mounting portion 12, and is provided lower than the guide recess 25.

[0019] As shown in FIG. 1, a tool body 10 having an insert mounting portion 12 and a fixing member mounting portion 16 at its tip has a main coolant passage 31, branch coolant passages 32, 33, and multiple coolant discharge passages 34 therein.

[0020] The main coolant passage 31 is formed along the longitudinal direction of the tool body 10. The main coolant passage 31 has a plurality of inlets 35, 36, and 37. The inlet 35 is formed on the rear end surface of the tool body 10, the inlet 36 is formed on the bottom surface at the middle in the longitudinal direction of the tool body 10, and the inlet 37 is formed on the bottom surface at the tip side of the tool body 10. The main coolant passage 31 is supplied with coolant from any one of the inlets 35, 36, and 37, and the inlets 35, 36, and 37 that are not used for supplying coolant are sealed with enamel set screws or the like.

[0021] The coolant branch passage 32 is formed at the upper part on the tip side of the tool body 10, and one end thereof is connected to the main coolant passage 31. The other end of this coolant branch passage 32 is connected to the fitting hole 21, and its opening portion serves as the outlet 26. The coolant supplied to the main coolant passage 31 is sent to this coolant branch passage 32. Note that the fluid supplied to the main coolant passage 31 is not limited to coolant, and various lubricants and coolants can be used, and mist or air may also be supplied.

[0022] The coolant branch passage 33 is formed at the lower part on the tip side of the tool body 10, and one end of the coolant branch passage 33 is connected to the main coolant passage 31. The other end of the coolant branch passage 33 is connected to one end of a plurality of coolant discharge passages 34. The other end of the coolant discharge passage 34 opens near the tip of the tool body 10, and this opening portion is a discharge port 34a. The coolant supplied to the main coolant passage 31 is sent to the coolant branch passage 33. The coolant sent to the coolant branch passage 33 passes through the coolant discharge passage 34 and is discharged from the discharge port 34a, and cools and lubricates the vicinity of the flank face of the cutting insert 40.

[0023] (Cutting insert) 5 and 6, the cutting insert 40 attached to the insert attachment portion 12 of the tool body 10 is formed in, for example, a flat, substantially triangular three-dimensional shape. The cutting insert 40 has end faces 43 on the front and back, and each end face 43 has three corner portions 41. The cutting insert 40 also has a fixing hole portion 42 in its center.

[0024] The cutting insert 40 has substantially triangular end faces 43 facing each other and three peripheral side faces 44 connecting these end faces 43. In this cutting insert 40, the vicinity of each corner portion 41 on the ridge line 45 between each end face 43 and the peripheral side face 44 is formed as a cutting edge 46.

[0025] The cutting insert 40 is placed and fixed on the insert attachment portion 12 of the tool body 10 with one of the end faces 43 facing upward and one of the three corner portions 41 facing the tip direction. In this way, the cutting insert 40 is capable of cutting at a total of six locations by using one of the three corner portions 41, each having a cutting edge 46, on each end face 43 facing the tip direction.

[0026] (Fixing member) 7 to 11, the fixing member 50 has a fixing member main body 51 and a fitting protrusion 52. The fitting protrusion 52 extends downward from the bottom of the fixing member main body 51.

[0027] The fixing member body 51 has a pressing portion 55 on the tip side from the fitting protrusion 52, and a pressing protrusion 56 protruding downward is formed on this pressing portion 55. This pressing protrusion 56 is a protrusion for fixing the cutting insert 40, and may have any shape as long as it can press the inner circumferential surface of the fixing hole portion 42 of the cutting insert. In addition, the fixing member body 51 has a sliding surface 58 on the rear end portion 57 side from the fitting protrusion 52, which gradually slopes backward as it goes downward.

[0028] The fitting projection 52 is formed in a cylindrical shape. The fitting projection 52 has engagement recesses 61 on both sides. The engagement recesses 61 are formed in a concave shape that gradually inclines toward the center toward the protruding direction of the fitting projection 52. A contact protrusion 62 that protrudes in a spherical convex shape is formed at the bottom of the engagement recess 61. In addition, a guide protrusion 63 in a spherical convex shape is formed near the base on the rear side of the fitting projection 52. Furthermore, the fitting projection 52 has an annular recess 65 at its tip, and a coil spring 66 is fitted and attached to the annular recess 65. In addition, an annular O-ring 67 is attached to the base of the fitting projection 52.

[0029] 12, the fitting protrusion 52 has a tip 52a formed in a circular shape with an outer diameter D1. In contrast, the base end 52b side of the fitting protrusion 52 is formed in an elliptical shape having a major axis D1 and a minor axis D2, with the front-to-rear direction of the fixing member 50 being the minor axis direction. As a result, the dimension of the fitting protrusion 52 in the front-to-rear direction becomes gradually smaller from the tip 52a to the base end 52b.

[0030] The fixed member 50 has a coolant introduction flow passage (introduction flow passage) 71, a coolant discharge flow passage (discharge flow passage) 72, and a coolant reservoir (fluid reservoir) 73. The coolant introduction flow passage 71, the coolant discharge flow passage 72, and the coolant reservoir 73 constitute a coolant flow passage (flow passage) in the fixed member 50. One end of the coolant introduction flow passage 71 opens on the tip side of the guide protrusion 63 on the rear side of the fitting protrusion 52, and this opening portion is an inlet 74. The coolant introduction flow passage 71 is formed from the inlet 74 toward the fixed member main body 51 while curving upward on the fitting protrusion 52. In this example, two coolant discharge flow passages 72 are formed. These coolant discharge flow passages 72 are formed, for example, in parallel on the tip side of the fixed member main body 51 along the front-rear direction, and open at the tip of the fixed member main body 51. The opening portion of these coolant discharge flow passages 72 is an outlet 72a. The coolant reservoir 73 is formed in a position above the fitting protrusion 52 in the fixed member body 51. The coolant inlet flow passage 71 and the coolant discharge flow passage 72 are each connected to the coolant reservoir 73. The coolant reservoir 73 has a flow passage cross section larger than the coolant inlet flow passage 71 and the coolant discharge flow passage 72. Note that the two coolant discharge flow passages 72 are not limited to being arranged in parallel.

[0031] (Fixing cutting insert) Next, a case where the cutting insert 40 disposed in the insert attachment portion 12 of the tool body 10 is fixed by the fixing member 50 will be described.

[0032] First, with respect to the tool body 10 with the cutting insert 40 disposed in the insert mounting portion 12, the fitting protrusion 52 of the fixing member 50 is inserted into the fitting hole 21 of the fixing member mounting portion 16, and the fixing member body 51 is disposed on the upper part of the fixing member mounting portion 16. Then, the pressing protrusion 56 formed on the pressing portion 55 of the fixing member body 51 is fitted into the fixing hole 42 of the cutting insert 40. At this time, the coil spring 66 at the tip of the fitting protrusion 52 is abutted against the bottom 21a of the fitting hole 21.

[0033] In this state, the fixing screw 23 is screwed into the female thread 22 of the fixing member mounting portion 16 of the tool body 10. Then, as shown in Fig. 13, the tip of the fixing screw 23 protrudes into the fitting hole 21 and is inserted into one of the engagement recesses 61 formed in the fitting protrusion 52, and abuts against the contact protrusion 62 formed at the bottom of the engagement recess 61. Then, by further screwing in the fixing screw 23, the fitting protrusion 52 is pulled into the fitting hole 21 against the biasing force of the coil spring 66 by the fastening force of the fixing screw 23. As a result, the fixing member 50 is pressed toward the fixing member mounting portion 16 of the tool body 10. Then, the cutting insert 40 is pressed against the shim 15 of the insert mounting portion 12 of the tool body 10 by the pressing force F1 by the pressing portion 55 of the fixing member 50.

[0034] In addition, by pressing the fixing member 50 against the fixing member mounting portion 16, the sliding surface 58 of the fixing member main body 51 comes into contact with and slides against the sliding surface 18 of the tool body 10. Then, the fixing member 50 is pulled toward the rear of the tool body 10 by a component force F3 of the reaction force F2 from the sliding surface 18 of the tool body 10. As a result, the pressing protrusion 56 fitted into the fixing hole portion 42 of the cutting insert 40 moves rearward while abutting against the inner peripheral surface of the fixing hole portion 42. Therefore, the pressing protrusion 56 of the fixing member 50 pulls the cutting insert 40 toward the rear side of the insert mounting portion 12 of the tool body 10 and presses it against the side wall surface 14. In this way, the cutting tool 100 is provided with a double clamp type fixing method in which the fixing member 50 presses two points, the upper end surface 43 of the cutting insert 40 and the inner peripheral surface of the fixing hole portion 42.

[0035] Here, the fitting protrusion 52 of the fixed member 50 has an elliptical base end 52b smaller in the front-rear direction than the tip 52a. Therefore, in the front-rear direction of the fixed member 50, a gap is formed between the fitting protrusion 52 and the fitting hole 21, which gradually becomes larger toward the base end 52b of the fitting protrusion 52. As a result, when the fitting protrusion 52 is pulled into the fitting hole 21 by the fixing screw 23, the fixed member 50 is displaced smoothly toward the rear of the tool body 10. The fitting protrusion 52 may be elliptical in shape with the front-rear direction of the fixed member 50 being the minor axis direction over the entire length. In this case, by making the minor axis dimension on the base end 52b side smaller than the minor axis on the tip 52a side, a gap is formed between the fitting protrusion 52 and the fitting hole 21, which gradually becomes larger toward the base end 52b of the fitting protrusion 52, in the front-rear direction of the fixed member 50, and the fixed member 50 fitted in the fitting hole 21 can be displaced smoothly toward the rear of the tool body 10.

[0036] In addition, in a clamped state in which the cutting insert 40 is fixed to the insert attachment portion 12, the guide protrusion 63 formed on the fitting protrusion 52 of the fixing member 50 is fitted into the guide recess 25 formed in the fitting hole 21 of the tool body 10. As a result, the fixing member 50 is prevented from rotating around the axis of the fitting protrusion 52 of the fixing member 50 by the guide protrusion 63 and the guide recess 25 which fit together. Therefore, the fluctuation of the fixing member 50 during cutting processing by the cutting insert 40 of the cutting tool 100 is suppressed, and good cutting processing by the cutting insert 40 is possible.

[0037] 14, a guide protrusion 63 may also be provided on the front side of the fitting protrusion 52 of the fixing member 50. In this case, a guide recess 25 into which the guide protrusion 63 provided on the front side of the fitting protrusion 52 can be fitted is provided on the insert attachment portion 12 side of the fitting hole 21. This can further enhance the anti-rotation effect around the axis of the fitting protrusion 52 of the fixing member 50.

[0038] In addition, in a clamped state in which the cutting insert 40 is fixed to the insert mounting portion 12, the O-ring 67 attached to the base of the fitting projection 52 of the fixing member 50 is in close contact with the mounting surface 17 of the fixing member mounting portion 16 of the tool body 10. This provides a seal between the bottom of the fixing member 50 and the mounting surface 17 of the fixing member mounting portion 16.

[0039] Furthermore, in a clamped state in which the cutting insert 40 is fixed to the insert attachment portion 12, the inlet 74 of the coolant introduction passage 71 formed in the fitting protrusion 52 of the fixed member 50 is communicated with the outlet 26 of the coolant branch passage 32, which is a supply passage formed in the fitting hole 21 of the tool body 10. As a result, the coolant sent from the main coolant passage 31 to the coolant branch passage 32 is sent to the coolant introduction passage 71 of the fixed member 51. The coolant sent to the coolant introduction passage 71 is then sent to the coolant discharge passage 72 via the coolant reservoir 73 and discharged from the discharge port 72a at the tip of the fixed member 50. As a result, the coolant discharged from the discharge port 34a at the tip of the tool body 10 and the coolant discharged from the discharge port 72a at the tip of the fixed member 50 are sprayed onto the cutting portion by the cutting insert 40. As a result, the cutting portion by the cutting insert 40 is well cooled and lubricated. Here, a coolant reservoir 73 having a large flow passage cross section is provided between the coolant inlet flow passage 71 and the coolant outlet flow passage 72. This reduces pressure loss of the coolant when it is sent from the coolant inlet flow passage 71 to the coolant outlet flow passage 72 having a small inner diameter, and allows the coolant to be discharged well from the outlet port 72a.

[0040] (Removing the cutting insert) Next, a case where the cutting insert 40 fixed to the insert attachment portion 12 of the tool body 10 by the fixing member 50 is removed will be described.

[0041] To remove the cutting insert 40, first, the fixing screw 23 that fixes the fixing member 50 is loosened. Then, the fixing screw 23 is pulled out from the engagement recess 61 of the fixing member 50. Then, the fixing member 50 is pushed up in a direction away from the fixing member mounting portion 16 of the tool body 10 by the elastic force of the coil spring 66 at the tip of the fitting protrusion 52. This releases the fixing of the cutting insert 40 by the fixing member 50. In this way, when the fixing member 50 is pushed up by the coil spring 66, the guide protrusion 63 of the fitting protrusion 52 that was engaged with the guide recess 25 of the fitting hole 21 slides with the guide recess 25. As a result, the rear side of the fixing member 50 is guided along the contact surface between the guide protrusion 63 and the guide recess 25, and the rear part of the fixing member 50 is smoothly pushed up. Therefore, the fixing member 50 whose rear part is pushed up can be easily gripped and removed from the fixing member mounting portion 16 of the tool body 10.

[0042] As described above, according to the fixing member 50 of this embodiment, the inlet 74 communicating with the outlet 26 of the coolant branch passage 32 of the tool body 10 is formed on the outer circumferential surface of the fitting protrusion 52. Therefore, the hole diameter of the inlet 74 can be made larger than when the inlet 74 of the coolant introduction passage 71 is formed on the end surface of the fitting protrusion 52. This reduces the pressure loss of the coolant sent from the supply path of the tool body 10 to the coolant introduction passage 71, and allows the coolant to be smoothly discharged from the outlet 72a at the tip of the fixing member body 51. Therefore, the coolant can be well supplied to the cutting part by the cutting insert 40 to cool and lubricate it. In addition, since there is no inlet on the end surface of the fitting protrusion 52 that is fitted into the fitting hole 21 of the tool body 10, a spring 66 for releasing the fixing member body 51 from the tool body 10 can be attached to the end of the fitting protrusion 52.

[0043] In addition, a coolant reservoir 73 having a large flow cross section is provided between the coolant inlet flow path 71 and the coolant outlet flow path 72, so that pressure loss when the coolant is sent from the coolant inlet flow path 71 to the coolant outlet flow path 72 is reduced, and the coolant can be discharged smoothly from the outlet port 72a.

[0044] Moreover, the coolant introduction passage 71, into which the coolant is fed from the inlet 73, is formed from the inlet 74 toward the coolant reservoir 73 while curving inside the fitting projection 52, so that the coolant fed from the inlet 74 flows smoothly along the curved coolant introduction passage 71. This makes it possible to reduce pressure loss of the fed coolant. [Explanation of symbols]

[0045] 10 Tool body 12 Insert mounting part 21 Fitting hole 26 Outlet 32 Coolant branch passage (supply passage) 40 Cutting insert 50 Fixing member 51 Fixing member body 52 Fitting protrusion 55 Pressing part 71 Coolant introduction passage (passage) 72 Coolant discharge passage (passage) 72a Discharge port 73 Coolant reservoir (fluid reservoir) 74 Inlet 100 cutting tools

Claims

1. A fixing member that presses and fixes a cutting insert disposed in an insert mounting portion of a tool body, A fixing member body having a pressing portion that presses the cutting insert; a fitting protrusion that protrudes from a bottom of the fixing member body and is fitted into a fitting hole formed in the tool body; a flow path for guiding the fluid fed from the supply path of the tool body to a discharge port formed at a tip of the fixed member body and discharging the fluid; Equipped with An inlet of the flow path communicating with an outlet of the supply path of the tool body is formed on an outer circumferential surface of the fitting projection. Fixing member.

2. The flow path includes an introduction flow path on the inlet side, a discharge flow path on the discharge port side, and a fluid reservoir provided between the introduction flow path and the discharge flow path, and the fluid reservoir has a flow path cross section larger than the introduction flow path and the discharge flow path. The fixing member according to claim 1 .

3. The introduction flow path is formed from the inlet toward the fluid reservoir while curving inside the fitting projection. The fixing member according to claim 2 .

4. A fixing member according to any one of claims 1 to 3, a tool body having an insert mounting portion in which the cutting insert is disposed and a fixing member mounting portion to which the fixing member is attached; a cutting insert that is disposed in the insert attachment portion and is pressed and fixed by the fixing member; Equipped with The tool body includes: a fitting hole formed in the fixing member attachment portion and into which the fitting protrusion of the fixing member is fitted; a supply passage formed on an inner circumferential surface of the fitting hole and having an outlet port communicating with the inlet port on the outer circumferential surface of the fitting projection; Equipped with cutting tools.

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