Cutting tool

Abstract

The cutting tool has a body. The main body has a front end surface, a rear end surface, and an outermost peripheral surface. The rear end face is opposite to the front end face. The outermost peripheral surface is connected to the front end surface and the rear end surface, respectively. The body has a first member, a second member, and a fixing member. The first member surrounds the axis. The first member has a first outer peripheral surface. The second member has an inner peripheral surface. The inner peripheral surface surrounds the first outer peripheral surface. The second member forms each of a front end surface, a rear end surface, and an outermost peripheral surface. The fixing member blocks a gap between the first outer peripheral surface and the inner peripheral surface. A through hole is formed in the first member. The through-hole extends along an axis. A space is formed between the first member and the second member. The space surrounds the through hole. A flow path is formed in the second member. The flow path is connected to the space. The flow path opens at the outermost peripheral surface.

Description

Technical Field

[0001] The present invention relates to a cutting tool. Background Art

[0002] In Japanese Unexamined Patent Application Publication No. 2010-234457 (Patent Document 1), a cutting tool in which a plurality of cutting blades are mounted on a tool body is disclosed. In the tool body, ejection holes for ejecting a coolant toward the cutting blades are formed.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2010-234457 Summary of the Invention

[0006] The cutting tool according to the present invention is configured to be rotatable about an axis. The cutting tool includes a main body and a cutting blade. The main body includes a front end face, a rear end face, and an outermost peripheral face. The rear end face is located opposite to the front end face. The outermost peripheral face is connected to the front end face and the rear end face, respectively. Pocket holes are formed in the outermost peripheral face. The cutting blade is disposed in the pocket hole. The main body includes a first member, a second member, a support member, and a fixing member. The first member surrounds the axis. The first member has a first outer peripheral face. The second member has an inner peripheral face. The inner peripheral face surrounds the first outer peripheral face. The second member forms each of the front end face, the rear end face, and the outermost peripheral face. The support member connects the first outer peripheral face and the inner peripheral face. The support member is separated from the front end face and the rear end face, respectively. The fixing member closes a gap between the first outer peripheral face and the inner peripheral face. A through hole is formed in the first member. The through hole extends along the axis. A space is formed between the first member and the second member. The space surrounds the through hole. A flow path is formed in the second member. The flow path is connected to the space. The flow path opens at the outermost peripheral face. Brief Description of the Drawings

[0007] Figure 1 is a perspective schematic view showing the configuration of the cutting tool according to the first embodiment.

[0008] Figure 2 is a front view schematic view showing the configuration of the cutting tool according to the first embodiment.

[0009] Figure 3 is along Figure 2 a longitudinal sectional schematic view taken along line III-III.

[0010] Figure 4 is along Figure 3 a cross-sectional schematic view taken along line IV-IV.

[0011] Figure 5 is along Figure 3Schematic cross-sectional view of the V-V line.

[0012] Figure 6 It is an enlarged three-dimensional schematic view showing the structure of the cutting blade and the pocket.

[0013] Figure 7 It is an enlarged three-dimensional schematic view showing the structure of the pocket.

[0014] Figure 8 It is a longitudinal sectional schematic view showing the cross-sectional shape of the first flow path portion.

[0015] Figure 9 It shows Figure 5 An enlarged cross-sectional schematic view of region IX.

[0016] Figure 10 It is a partial cross-sectional schematic view showing the structure of the cutting tool according to the second embodiment.

[0017] Figure 11 It is a bottom view schematic view showing the structure of the cage.

[0018] Figure 12 It is along Figure 10 A cross-sectional schematic view of the XII-XII line.

[0019] Figure 13 It is an enlarged three-dimensional schematic view showing the flow of the cutting fluid in the periphery of the cutting blade. Detailed implementation mode

[0020] [Problems to be solved by the present invention]

[0021] The object of the present invention is to provide a cutting tool capable of increasing the flow rate of the cutting fluid discharged from the outermost peripheral surface of the main body.

[0022] [Effects of the present invention]

[0023] According to the present invention, it is possible to provide a cutting tool capable of increasing the flow rate of the cutting fluid discharged from the outermost peripheral surface of the main body.

[0024] [Description of the embodiments of the present invention]

[0025] First, the content of the embodiments of the present invention will be listed and described.

[0026] (1) The cutting tool 500 according to the present invention is configured to be rotatable about an axis A. The cutting tool 500 includes a main body 100 and a cutting blade 200. The main body 100 includes a front end face 1, a rear end face 2, and an outermost peripheral face 21. The rear end face 2 is located opposite to the front end face 1. The outermost peripheral face 21 is connected to the front end face 1 and the rear end face 2 respectively. Pocket holes 70 are formed in the outermost peripheral face 21. The cutting blade 200 is disposed in the pocket holes 70. The main body 100 includes a first member 10, a second member 20, a support member 30, and a fixing member 40. The first member 10 surrounds the axis A. The first member 10 has a first outer peripheral face 11. The second member 20 has an inner peripheral face 22. The inner peripheral face 22 surrounds the first outer peripheral face 11. The second member 20 forms each of the front end face 1, the rear end face 2, and the outermost peripheral face 21. The support member 30 connects the first outer peripheral face 11 and the inner peripheral face 22. The support member 30 is separated from the front end face 1 and the rear end face 2 respectively. The fixing member 40 seals the gap between the first outer peripheral face 11 and the inner peripheral face 22. A through hole 91 is formed in the first member 10. The through hole 91 extends along the axis A. A space 92 is formed between the first member 10 and the second member 20. The space 92 surrounds the through hole 91. A flow path 50 is formed in the second member 20. The flow path 50 is connected to the space 92. The flow path 50 opens at the outermost peripheral face 21.

[0027] Therefore, the cutting fluid supplied into the main body 100 flows into the space 92. Thereby, the flow rate of the cutting fluid flowing out into the through hole 91 can be reduced. Therefore, it is possible to suppress the cutting fluid from flowing out of the main body 100 through the through hole 91. As a result, compared with the case where the space 92 is not formed, the flow rate of the cutting fluid discharged from the outermost peripheral face 21 can be increased.

[0028] (2) In the cutting tool 500 according to the above (1), the flow path 50 may also have a flow path portion 53 that is curved when viewed along the axis A. Therefore, the design freedom of the flow path portion 53 can be improved, and at the same time, the pressure loss of the cutting fluid flowing in the flow path portion 53 can be reduced.

[0029] (3) In the cutting tool 500 according to the above (1) or (2), in a cross section perpendicular to the extending direction of the flow path 50, the shape of the flow path 50 is elliptical.

[0030] (4) In the cutting tool 500 according to any one of the above (1) to (3), it may also be that, in a cross section perpendicular to the extending direction of the flow path 50, when the width of the flow path 50 in a first direction 101 from the front end face 1 toward the rear end face 2 is a first width W1, and the width of the flow path 50 in a second direction 102 perpendicular to the first direction 101 is a second width W2, the first width W1 is larger than the second width W2.

[0031] (5) According to the cutting tool 500 described in any one of (1) to (4) above, the cutting blade 200 may also include a bottom surface 83 and a rake face 81. The bottom surface 83 may also be in contact with the outermost peripheral surface 21. The rake face 81 may also be located opposite to the bottom surface 83. The outermost peripheral surface 21 may also have a seat surface 41 and a first surface 61. The seat surface 41 may also be in contact with the bottom surface 83. The first surface 61 may also be located in front of the seat surface 41 in the rotational direction R. The seat surface 41 and the first surface 61 may also form a pocket 70. The flow path 50 may also have a first flow path portion 51. The first flow path portion 51 may also open at the first surface 61. The first flow path portion 51 may also open toward the rake face 81. Therefore, the cutting edge 84 connected to the rake face 81 can be effectively cooled.

[0032] (6) According to the cutting tool 500 described in (5) above, the flow path 50 may also be based on a second flow path portion 52. The second flow path portion 52 may also open at the first surface 61. The second flow path portion 52 may also be separated from the first flow path portion 51. The second flow path portion 52 may also open toward the rake face 81. At the first surface 61, a first opening 151 and a second opening 152 may also be formed. The first opening 151 may also be connected to the first flow path portion 51. The second opening 152 may also be connected to the second flow path portion 52. The area of the first opening 151 may also be different from the area of the second opening 152.

[0033] (7) According to the cutting tool 500 described in (5) above, the flow path 50 may also have a second flow path portion 52. The second flow path portion 52 may also open at the first surface 61. The second flow path portion 52 may also be separated from the first flow path portion 51. The second flow path portion 52 may also open toward the rake face 81. When the area of the first flow path portion 51 in a cross-section perpendicular to the extending direction of the first flow path portion 51 is a first area, and the area of the second flow path portion 52 in a cross-section perpendicular to the extending direction of the second flow path portion 52 is a second area, the first area may also be different from the second area.

[0034] (8) According to the cutting tool 500 described in any one of (5) to (7) above, the cutting blade 200 may also include a flank face 82. The flank face 82 may also be connected to the rake face 81. The outermost peripheral surface 21 may also have a second surface 62. The second surface 62 may also be located behind the seat surface 41 in the rotational direction R. The second surface 62 may also be located in the direction from the axis A toward the outermost peripheral surface 21 with respect to the seat surface 41. The flow path 50 may also have a third flow path portion 53. The third flow path portion 53 may also open at the second surface 62. The third flow path portion 53 may also open toward the flank face 82. Therefore, the cutting edge 84 connected to the flank face 82 can be effectively cooled.

[0035] (9)According to the cutting tool 500 according to any one of (1) to (8) above, the first member 10 may also include a first inner peripheral surface 12. The first inner peripheral surface 12 may also form a through hole 91. The first inner peripheral surface 12 may also have a first inner peripheral surface portion 13 and a second inner peripheral surface portion 14. The first inner peripheral surface portion 13 extends along the axis A. The second inner peripheral surface portion 14 is located between the first inner peripheral surface portion 13 and the front end surface 1. The second inner peripheral surface portion 14 is inclined with respect to the first inner peripheral surface portion 13. The diameter of the second inner peripheral surface portion 14 may also become smaller as it separates from the front end surface 1.

[0036] When forming the main body 100 using a three-dimensional printer, when forming a portion that protrudes in a direction perpendicular to the stacking direction of the three-dimensional printer, a support material is required. In this case, it is necessary to remove the support material from the main body 100. As a result, the time required for forming the main body 100 increases. According to the cutting tool 500 according to (9) above, when the stacking direction of the three-dimensional printer is the first direction 101, in the formation of the second inner peripheral surface portion 14, the amount of support material used can be reduced. As a result, the time required for forming the main body 100 can be reduced.

[0037] (10) The cutting tool 500 according to any one of (1) to (9) above may also further include a cage 300. The cage 300 may be configured to supply cutting fluid to the space 92. In the cage 300, at least one discharge port 98 may be formed. The first member 10, the second member 20, and the support member 30 may also form at least one inlet 99. The at least one inlet 99 may be connected to the space 92. When viewed along the axis A, the at least one discharge port 98 may overlap with the at least one inlet 99. The number of the at least one discharge port 98 may be the same as the number of the at least one inlet 99.

[0038] Therefore, compared with the case where the discharge port 98 does not overlap with the inlet 99 when viewed along the axis A, the distance between the discharge port 98 and the inlet 99 becomes shorter. As a result, when the cutting fluid discharged from the discharge port 98 flows toward the inlet 99, the pressure loss of the cutting fluid can be reduced.

[0039] [Details of Embodiments of the Present Invention]

[0040] Next, the details of the embodiments of the present invention will be described based on the drawings. It should be noted that the same or corresponding parts in the following drawings are denoted by the same reference numerals, and their description will not be repeated.

[0041] (First Embodiment)

[0042] First, the configuration of the cutting tool 500 according to the first embodiment will be described.

[0043] Figure 1 is a perspective view showing the configuration of the cutting tool 500 according to the first embodiment. Figure 2 is a front view showing the configuration of the cutting tool 500 according to the first embodiment. As Figure 1 and Figure 2 shown, the cutting tool 500 mainly includes a main body 100, a plurality of cutting inserts 200, and a plurality of first fastening screws 90. The cutting tool 500 is configured to be rotatable about an axis A. In other words, the cutting tool 500 is a rotary cutting tool. The cutting tool 500 is, for example, an end mill. The cutting tool 500 is, for example, a repeat cutting tool.

[0044] The main body 100 has a first front end face 1, a first rear end face 2, a second outer peripheral face 21, and a first inner peripheral face 12. The first rear end face 2 is located opposite to the first front end face 1. The first rear end face 2 is arranged to face a tool spindle (not shown) that rotates the cutting tool 500. The direction from the first front end face 1 toward the first rear end face 2 is defined as the first direction 101. The direction from the first rear end face 2 toward the first front end face 1 is defined as the third direction 103.

[0045] The second outer peripheral face 21 is connected to the first front end face 1 and the first rear end face 2 respectively. The second outer peripheral face 21 is the outermost peripheral face of the main body 100. The second outer peripheral face 21 surrounds the axis A. The second outer peripheral face 21 has an outermost peripheral portion 68. A plurality of pocket holes 70 are formed in the second outer peripheral face 21. The plurality of pocket holes 70 are respectively recessed inward with respect to the outermost peripheral portion 68. The inward direction means the direction from the second outer peripheral face 21 toward the axis A.

[0046] The first inner peripheral face 12 is connected to the first front end face 1. The first inner peripheral face 12 surrounds the axis A. The first inner peripheral face 12 is surrounded by the second outer peripheral face 21. A first through hole 91 is formed in the main body 100. The first inner peripheral face 12 forms the first through hole 91. A groove portion 94 is formed in the first rear end face 2. The groove portion 94 extends, for example, along a direction perpendicular to the axis A.

[0047] As Figure 1 and Figure 2 shown, the cutting inserts 200 are arranged in the pocket holes 70. Specifically, one cutting insert 200 is arranged in one pocket hole 70. On the second outer peripheral face 21, the cutting inserts 200 are arranged along a curve that spirally extends around the axis A. The cutting inserts 200 are mounted on the main body 100 using the first fastening screws 90.

[0048] The number of cutting blades 200 mounted on the main body 100 is, for example, 15. In the rotational direction R, three cutting blades 200 are arranged in a row. In other words, three cutting blades 200 constitute one layer. The number of layers of the cutting blades 200 is five. From another perspective, the cutting blades 200 are classified into three groups. One group contains five cutting blades 200. The five cutting blades 200 included in one group are arranged along a spiral curve. In other words, the cutting blades 200 are arranged along each of the three spiral curves. The three spiral curves are separated from each other.

[0049] Similarly, the number of pocket holes 70 formed in the second outer peripheral surface 21 is, for example, 15. In the rotational direction R, three pocket holes 70 are arranged in a row. In other words, three pocket holes 70 constitute one layer. The number of layers of the pocket holes 70 is five. From another perspective, the pocket holes 70 are classified into three groups. One group contains five pocket holes 70. The five pocket holes 70 included in one group are arranged along a spiral curve. In other words, the pocket holes 70 are arranged along each of the three spiral curves. The five pocket holes 70 included in one group may also be connected to each other.

[0050] Figure 3 is along Figure 2 the longitudinal sectional schematic view of line III-III. Figure 3 The shown section is a section that includes the axis A and intersects with the support member 30. As Figure 3 shown, the main body 100 has a first member 10, a second member 20, a support member 30, and a fixing member 40.

[0051] The first member 10 extends along the axis A. The first member 10 has a first outer peripheral surface 11, an inclined surface 15, and a first inner peripheral surface 12. The first outer peripheral surface 11 extends along the axis A. The inclined surface 15 is connected to the first outer peripheral surface 11 and the first inner peripheral surface 12 respectively.

[0052] The first inner peripheral surface 12 has a first inner peripheral surface portion 13 and a second inner peripheral surface portion 14. The first inner peripheral surface portion 13 is connected to the inclined surface 15. The first inner peripheral surface portion 13 extends along the axis A. The second inner peripheral surface portion 14 is connected to the first inner peripheral surface portion 13. In the first direction 101, the second inner peripheral surface portion 14 is located between the first inner peripheral surface portion 13 and the first front end surface 1. The second inner peripheral surface portion 14 may also be connected to the first front end surface 1. The second inner peripheral surface portion 14 is inclined outward with respect to the first inner peripheral surface portion 13. From another perspective, the diameter of the second inner peripheral surface portion 14 becomes smaller as it separates from the first front end surface 1. The outer side refers to the direction from the axis A toward the second outer peripheral surface 21.

[0053] The second member 20 forms each of the first front face 1, the first rear face 2, and the second outer peripheral face 21. The second member 20 has a second inner peripheral face 22. The second inner peripheral face 22 is separated from the first outer peripheral face 11 and the first front face 1 respectively. The second inner peripheral face 22 faces the first outer peripheral face 11. The second inner peripheral face 22 is connected to the first rear face 2. The second inner peripheral face 22 extends along the axis A. The second inner peripheral face 22 may also be substantially parallel to the first outer peripheral face 11.

[0054] The support member 30 is located between the first outer peripheral face 11 and the second inner peripheral face 22. The support member 30 connects the first member 10 and the second member 20. Specifically, the support member 30 connects the first outer peripheral face 11 and the second inner peripheral face 22. The support member 30 is separated from the first front face 1 and the first rear face 2 respectively. In the first direction 101, the support member 30 is located between the first front face 1 and the first rear face 2.

[0055] The support member 30 has a fourth face 34 and a fifth face 35. The fourth face 34 is connected to the inclined face 15 and the second inner peripheral face 22 respectively. In the first direction 101, the fourth face 34 may also be located between the inclined face 15 and the first front face 1. The fourth face 34 is, for example, planar. The fifth face 35 is located opposite to the fourth face 34. Specifically, the fifth face 35 is in the third direction 103 with respect to the fourth face 34. The fifth face 35 is connected to the first outer peripheral face 11 and the second inner peripheral face 22 respectively. The fifth face 35 is recessed in the first direction 101. In the first direction 101, the fifth face 35 is located between the fourth face 34 and the first front face 1.

[0056] The fixing member 40 connects the first member 10 and the second member 20, and seals the gap between the first outer peripheral face 11 and the second inner peripheral face 22. The fixing member 40 is separated from the support member 30. The fixing member 40 is in the third direction 103 with respect to the support member 30. The fixing member 40 may also form a part of the first front face 1. The fixing member 40 surrounds the axis A. The fixing member 40 has a third face 45. The third face 45 is connected to the first outer peripheral face 11 and the second inner peripheral face 22 respectively. The third face 45 faces the fifth face 35 of the support member 30.

[0057] A first through hole 91 is formed in the first member 10. The first through hole 91 may also penetrate the first front face 1 and the inclined face 15. The first through hole 91 extends along the axis A.

[0058] An insertion hole 95 is formed in the main body 100. The insertion hole 95 extends along the axis A. The insertion hole 95 is formed by the second inner peripheral face 22. At the first rear face 2, the insertion hole 95 opens. The insertion hole 95 is connected to the first through hole 91. The insertion hole 95 is formed in the first direction 101 with respect to the first through hole 91.

[0059] A space 92 is formed between the first member 10 and the second member 20. Specifically, the space 92 is formed by the first outer peripheral surface 11, the second inner peripheral surface 22, and the third surface 45. The space 92 is connected to the insertion hole 95. The space 92 is separated from the first through hole 91. From another perspective, the space 92 is separated from the first through hole 91 by the first member 10. The space 92 is separated from the outside of the main body 100 by the second member 20 and the fixing member 40. The space 92 extends along the axis A.

[0060] A plurality of connection ports 160 are formed in the second inner peripheral surface 22. The connection ports 160 connect the space 92 and the flow path 50. From another perspective, in the second inner peripheral surface 22, the flow path 50 opens. The details of the flow path 50 will be described later. The plurality of connection ports 160 are separated from the insertion hole 95. In the first direction 101, the connection ports 160 are located between the third surface 45 and the inclined surface 15.

[0061] Figure 4 is along Figure 3 Cross-sectional schematic view taken along line IV-IV. Figure 4 The cross-section shown is a cross-section perpendicular to the axis A and intersecting the support member 30.

[0062] As Figure 4 shown, the first member 10 surrounds the axis A. In other words, the first inner peripheral surface 12 surrounds the axis A. When viewed along the axis A, the shape of the first member 10 is annular. The second member 20 surrounds the first member 10. In other words, the second inner peripheral surface 22 surrounds the first member 10. When viewed along the axis A, the shape of the second member 20 is annular. The third surface 45 surrounds the axis A. When viewed along the axis A, the shape of the third surface 45 is annular. A plurality of connection ports 160 may also be formed in the third surface 45.

[0063] The main body 100 has a plurality of support members 30. The number of support members 30 is, for example, three. The three support members 30 are separated from each other. When viewed along the axis A, the three support members 30 are, for example, located at positions that are triple-symmetric with respect to the axis A.

[0064] Figure 5 is along Figure 3 Cross-sectional schematic view taken along line V-V. Figure 5 The cross-section shown is a cross-section perpendicular to the axis A and passing between the support member 30 and the fixing member 40 in the first direction 101. As Figure 3 and Figure 5 shown, the space 92 surrounds the first through hole 91. From another perspective, the space 92 surrounds the axis A. When viewed along the axis A, the space 92 is annular.

[0065] Figure 6is an enlarged three-dimensional schematic view showing the configuration of the cutting blade 200 and the pocket 70. As Figure 6 shown, the cutting blade 200 has a bottom surface 83, a rake face 81, a flank face 82, and a flat surface 80. The bottom surface 83 contacts the second outer peripheral surface 21 of the main body 100. The bottom surface 83 is, for example, planar. The rake face 81 is located opposite the bottom surface 83. The flank face 82 is connected to the rake face 81 and the bottom surface 83, respectively. The ridge line between the rake face 81 and the flank face 82 forms a cutting edge 84. The cutting edge 84 may also be formed to incline rearward in the rotational direction R as it separates from the first front end face 1 (refer to Figure 1 and Figure 2 ).) in the first direction 101. The flat surface 80 is located opposite the bottom surface 83. The flat surface 80 is connected to the rake face 81. A second through hole 79 is formed in the flat surface 80.

[0066] Figure 7 is an enlarged three-dimensional schematic view showing the configuration of the pocket 70. Figure 7 The enlarged three-dimensional schematic view shown corresponds to the enlarged three-dimensional schematic view shown in Figure 6 . In Figure 7 , a part of the plurality of cutting blades 200 is not shown.

[0067] As Figure 6 and Figure 7 shown, the second outer peripheral surface 21 has a first seating surface 41, a second seating surface 42, a third seating surface 43, a first surface 61, and a second surface 62. The first seating surface 41, the second seating surface 42, the third seating surface 43, the first surface 61, and the second surface 62 form the pocket 70. The first seating surface 41, the second seating surface 42, and the third seating surface 43 are surfaces for arranging the cutting blade 200, respectively.

[0068] As Figure 6 and Figure 7 shown, the first seating surface 41 contacts the bottom surface 83 of the cutting blade 200. The first seating surface 41 is, for example, planar. The second seating surface 42 is located in the third direction 103 with respect to the first seating surface 41. The second seating surface 42 is, for example, planar. The third seating surface 43 is located in the first direction 101 with respect to the second seating surface 42. The third seating surface 43 is, for example, planar. In the radial direction, the third seating surface 43 is located inside with respect to each of the first seating surface 41 and the second seating surface 42. The radial direction means the direction perpendicular to the axis A and from the axis A toward the second outer peripheral surface 21.

[0069] The first surface 61 is located in front of the first seating surface 41 in the rotational direction R. The first surface 61 is, for example, planar. The second surface 62 is connected to the first seating surface 41 and the outermost peripheral portion 68, respectively. The second surface 62 is located behind the first seating surface 41 in the rotational direction R. The second surface 62 is separated from the first surface 61. In the radial direction, the second surface 62 is located between the first seating surface 41 and the outermost peripheral portion 68.

[0070] As Figure 6 and Figure 7 shown, a flow path 50 is formed in the main body 100. In Figure 6 and Figure 7 , the flow path 50 is indicated by a dashed line. The flow path 50 opens at the second outer peripheral surface 21. Specifically, the flow path 50 opens at the first surface 61 and the second surface 62, respectively. From another perspective, an opening 150 of the flow path 50 is formed in each of the first surface 61 and the second surface 62. The flow path 50 is connected to the space 92 (refer to Figure 3 ). The flow path 50 connects the space 92 to the outside of the main body 100.

[0071] The flow path 50 has a first flow path portion 51, a second flow path portion 52, a third flow path portion 53, a fourth flow path portion 54, and a fifth flow path portion 55. The first flow path portion 51, the second flow path portion 52, the third flow path portion 53, the fourth flow path portion 54, and the fifth flow path portion 55 are separated from each other.

[0072] A plurality of flow path portions are connected to one pocket hole 70. The number of flow path portions connected to one pocket hole 70 is, for example, five. A plurality of openings 150 are formed in the first surface 61. The number of openings 150 formed in the first surface 61 is, for example, three. A plurality of openings 150 are formed in the second surface 62. The number of openings 150 formed in the second surface 62 is, for example, two. The opening 150 has a first opening 151, a second opening 152, a third opening 153, a fourth opening 154, and a fifth opening 155.

[0073] The first flow path portion 51 opens at the first surface 61. From another perspective, a first opening 151 is formed in the first surface 61. The first opening 151 is connected to the first flow path portion 51. The first flow path portion 51 opens toward the rake face 81. In this specification, a flow path opening toward the rake face 81 means that the flow path opens in such a way that the liquid discharged linearly from the flow path touches the rake face 81.

[0074] The second flow path portion 52 opens at the first surface 61. From another perspective, a second opening 152 is formed in the first surface 61. The second opening 152 is connected to the second flow path portion 52. The second flow path portion 52 opens toward the rake face 81. The second flow path portion 52 may be located in the third direction 103 with respect to the first flow path portion 51.

[0075] The third flow path portion 53 opens at the second surface 62. From another perspective, a third opening 153 is formed in the second surface 62. The third opening 153 is connected to the third flow path portion 53. The third flow path portion 53 opens toward the flank face 82. In this specification, a flow path opening toward the flank face 82 means that the flow path opens in such a way that the liquid discharged linearly from the flow path touches the flank face 82.

[0076] The fourth flow path portion 54 opens on the first surface 61. In other words, a fourth opening portion 154 is formed on the first surface 61. The fourth opening portion 154 is connected to the fourth flow path portion 54. The fourth flow path portion 54 opens toward the rake face 81. In the first direction 101, the fourth flow path portion 54 may also be located between the first flow path portion 51 and the second flow path portion 52.

[0077] The fifth flow path portion 55 opens on the second surface 62. In other words, a fifth opening portion 155 is formed on the second surface 62. The fifth opening portion 155 is connected to the fifth flow path portion 55. The fifth flow path portion 55 opens toward the flank face 82. The fifth flow path portion 55 may also be located in the third direction 103 with respect to the third flow path portion 53.

[0078] The area of the first opening portion 151 is different from the area of the second opening portion 152. When viewed from a direction perpendicular to the first surface 61, the area of the second opening portion 152 may be larger than the area of the first opening portion 151. Thus, compared with the flow rate of the liquid discharged from the first flow path portion 51, the flow rate of the liquid discharged from the second flow path portion 52 can be increased. Therefore, the portion of the cutting edge 84 close to the first front end face 1 can be effectively cooled. When viewed in a direction perpendicular to the first surface 61, the area of the fourth opening portion 154 may be substantially the same as the area of the first opening portion 151.

[0079] The area of the first flow path portion 51 in a cross section perpendicular to the extending direction of the first flow path portion 51 is defined as the first area. The area of the second flow path portion 52 in a cross section perpendicular to the extending direction of the second flow path portion 52 is defined as the second area. The area of the third flow path portion 53 in a cross section perpendicular to the extending direction of the third flow path portion 53 is defined as the third area. The area of the fourth flow path portion 54 in a cross section perpendicular to the extending direction of the fourth flow path portion 54 is defined as the fourth area. The area of the fifth flow path portion 55 in a cross section perpendicular to the extending direction of the fifth flow path portion 55 is defined as the fifth area.

[0080] The first area may be different from the second area. The second area may be larger than the first area. The fourth area may be substantially the same as the first area. The third area may be substantially the same as the fifth area. The third area may be smaller than the second area.

[0081] As Figure 6 and Figure 7As shown, the plurality of openings 150 formed in the first surface 61 may also be arranged along the direction in which the cutting edge 84 extends. Specifically, the first opening 151, the second opening 152, and the fourth opening 154 may also be arranged along the direction in which the cutting edge 84 extends. Similarly, the plurality of openings 150 formed in the second surface 62 may also be arranged along the direction in which the cutting edge 84 extends. Specifically, the third opening 153 and the fifth opening 155 may also be arranged along the direction in which the cutting edge 84 extends.

[0082] As Figure 6 and Figure 7 As shown, a first screw hole 93 is formed in the first seating surface 41. In the first direction 101, the first screw hole 93 is formed between the third flow path portion 53 and the fifth flow path portion 55. In the first screw hole 93, the first fastening screw 90 and the main body 100 are fastened. The first fastening screw 90 is located within the second through hole 79 of the cutting blade 200.

[0083] In the above description, a configuration in which the flow path 50 has five flow path portions has been described. However, the configuration of the cutting tool 500 according to the present invention is not limited to the above configuration. Specifically, the number of flow path portions that the flow path 50 has may be less than 5 or may be 5 or more. On the first surface 61 and the second surface 62, five or more openings 150 may also be formed. On the first surface 61, three or more openings 150 may also be formed. On the second surface 62, two or more openings 150 may also be formed.

[0084] Figure 8 is a longitudinal cross-sectional view showing the cross-sectional shape of the first flow path portion 51. Figure 8 The cross-section shown is a cross-section perpendicular to the direction in which the first flow path portion 51 extends. As Figure 8 shown, in the cross-section perpendicular to the direction in which the flow path 50 extends, the direction perpendicular to the first direction 101 is defined as the second direction 102.

[0085] In the cross-section perpendicular to the direction in which the first flow path portion 51 extends, the shape of the first flow path portion 51 is, for example, elliptical. The ellipse is not limited to a geometric ellipse. The ellipse may also be a shape that includes an arc of an ellipse and is elongated.

[0086] In the cross-section perpendicular to the direction in which the flow path 50 extends, the width of the flow path 50 in the first direction 101 is defined as the first width W1. In the cross-section perpendicular to the direction in which the flow path 50 extends, the width of the flow path 50 in the second direction 102 is defined as the second width W2. As Figure 8As shown, the first width W1 may also be greater than the second width W2. The value obtained by dividing the first width W1 by the second width W2 is, for example, 1.5 or more and 2.5 or less. In a cross-section perpendicular to the direction in which the flow path 50 extends, the shape of the flow path 50 may also be an ellipse that is long in the first direction 101.

[0087] In the above description, the configuration in which the first width W1 is greater than the second width W2 has been described. However, the configuration of the cutting tool 500 according to the present invention is not limited to the above configuration. Specifically, the first width W1 may also be smaller than the second width W2. In a cross-section perpendicular to the direction in which the flow path 50 extends, the shape of the flow path 50 may also be an ellipse that is long in the second direction 102. The first width W1 may also be substantially the same as the second width W2. In a cross-section perpendicular to the direction in which the flow path 50 extends, the shape of the flow path 50 may also be circular.

[0088] Figure 9 represents Figure 5 an enlarged cross-sectional schematic view of the region IX. In Figure 9 it, the dashed line indicates the flow path 50. As Figure 9 shown, the flow path 50 is formed in the second member 20. When observing along the axis A, the first flow path portion 51, the second flow path portion 52, the third flow path portion 53, the fourth flow path portion 54, and the fifth flow path portion 55 do not overlap with each other. In other words, when observing along the axis A, the first flow path portion 51, the second flow path portion 52, the third flow path portion 53, the fourth flow path portion 54, and the fifth flow path portion 55 are separated from each other.

[0089] When observing along the axis A, the first flow path portion 51 is linear. When observing along the axis A, the first flow path portion 51 is inclined rearward in the rotational direction R with respect to the radial direction. When observing along the axis A, the second flow path portion 52 may be located in front of the first flow path portion 51 in the rotational direction R. When observing along the axis A, the second flow path portion 52 is inclined rearward in the rotational direction R with respect to the radial direction. When observing along the axis A, the fourth flow path portion 54 may be located in front of the first flow path portion 51 in the rotational direction R. When observing along the axis A, the fourth flow path portion 54 is linear. When observing along the axis A, the fourth flow path portion 54 is inclined rearward in the rotational direction R with respect to the radial direction.

[0090] When observing along the axis A, the third flow path portion 53 is located behind the first flow path portion 51 in the rotational direction R. When observing along the axis A, the third flow path portion 53 is curved. When observing along the axis A, the third flow path portion 53 is curved forward in the rotational direction R with respect to the radial direction. From another perspective, in the second surface 62, the third flow path portion 53 opens forward in the rotational direction R. When observing along the axis A, the third flow path portion 53 is arched. When observing along the axis A, the third flow path portion 53 may be bow-shaped or arc-shaped.

[0091] When viewed along the axis A, the fifth flow path portion 55 may also be located in front of the third flow path portion 53 in the rotational direction R. When viewed along the axis A, the fifth flow path portion 55 is curved. When viewed along the axis A, the fifth flow path portion 55 is curved forward in the rotational direction R with respect to the radial direction. In other words, in the second surface 62, the fifth flow path portion 55 opens forward in the rotational direction R. When viewed along the axis A, the fifth flow path portion 55 is arched. When viewed along the axis A, the fifth flow path portion 55 may be bow-shaped or arc-shaped.

[0092] As Figure 9 shown, in the radial direction, the cutting edge 84 is located outside with respect to the outermost peripheral surface 68. As Figure 7 and Figure 9 shown, in the radial direction, the second surface 62 is located outside with respect to the first seating surface 41. In the radial direction, the first surface 61 may also be located inside with respect to the first seating surface 41. The main body 100 according to the present invention can be manufactured, for example, by using a three-dimensional printer.

[0093] (Second Embodiment)

[0094] Next, the configuration of the cutting tool 500 according to the second embodiment will be described. The cutting tool 500 according to the second embodiment mainly differs from the cutting tool 500 according to the first embodiment in that it has a cage 300, and for other points, it is substantially the same as the configuration of the cutting tool 500 according to the first embodiment. Hereinafter, the description will focus on the points that are different from the configuration of the cutting tool 500 according to the first embodiment.

[0095] Figure 10 is a partial cross-sectional schematic view showing the configuration of the cutting tool 500 according to the second embodiment. In Figure 10 , cross-sections of the main body 100, the cutting insert 200, and the first fastening screw 90 are shown. Figure 10 The cross-section shown is a cross-section that includes the axis A and intersects the support member 30.

[0096] As Figure 10 shown, the cutting tool 500 may also further include a cage 300 and a second fastening screw 400. The cage 300 is configured to supply cutting fluid to the space 92. The cage 300 contacts the first rear end surface 2. The cage 300 is located in the first direction 101 with respect to the first member 10. The second fastening screw 400 fixes the cage 300 and the main body 100.

[0097] As Figure 10As shown, the cage 300 has a second front end face 96 and a second rear end face 97. In the first direction 101, the second front end face 96 is located between the first front end face 1 and the first rear end face 2. At the second front end face 96, the cage 300 faces the first member 10. The second rear end face 97 is located in the first direction 101 relative to the first rear end face 2.

[0098] As Figure 10 shown, the cage 300 has an insertion portion 85, a base portion 86, a connecting portion 87, and a protruding portion 88. The insertion portion 85 is located within the insertion hole 95 (see Figure 3 ). The insertion portion 85 forms the second front end face 96. The insertion portion 85 is located in the first direction 101 relative to the first member 10. The insertion portion 85 can also be separated from the first member 10. A second screw hole 89 is provided at the second front end face 96. The second screw hole 89 is provided along the axis A.

[0099] The base portion 86 is connected to the insertion portion 85. The base portion 86 is located in the first direction 101 relative to the insertion portion 85. The base portion 86 abuts against the first rear end face 2. The protruding portion 88 is connected to the base portion 86. The protruding portion 88 is located in the third direction 103 relative to the base portion 86. The protruding portion 88 is disposed within the groove portion 94. From another perspective, in the groove portion 94, the protruding portion 88 engages with the main body 100.

[0100] The connecting portion 87 is connected to the base portion 86. The connecting portion 87 is located in the first direction 101 relative to the base portion 86. The connecting portion 87 forms the second rear end face 97. The connecting portion 87 is the part that is mounted on the tool spindle (not shown). The shape of the connecting portion 87 is, for example, a conical trapezoid. As it goes from the second rear end face 97 toward the third direction 103, the diameter of the connecting portion 87 becomes larger.

[0101] As Figure 10 shown, the second fastening screw 400 is located within the first through hole 91. The second fastening screw 400 is, for example, a countersunk screw. The second fastening screw 400 has a screw portion 401 and a head 402. The screw portion 401 is surrounded by the first inner peripheral surface portion 13. The screw portion 401 can also be separated from the first inner peripheral surface portion 13. The screw portion 401 is fastened to the cage 300 at the second screw hole 89. The head 402 is connected to the screw portion 401. The shape of the head 402 is, for example, a conical trapezoid. The head 402 abuts against the second inner peripheral surface portion 14.

[0102] Figure 11 is a bottom view schematic diagram showing the structure of the cage 300. In Figure 11 it shows the structure of the cage 300 observed in the first direction 101. As Figure 11As shown, a plurality of discharge ports 98 are formed in the cage 300. Specifically, a plurality of discharge ports 98 are provided on the second front end face 96. The discharge port 98 is an opening through which the cutting fluid is discharged. The number of the discharge ports 98 is, for example, three. When observed along the axis A, the plurality of discharge ports 98 are located at positions that are triple-symmetric with respect to, for example, the axis A.

[0103] As Figure 11 shown, the cage 300 has, for example, two protrusion portions 88. When observed along the axis A, the insertion portion 85 is located between the two protrusion portions 88.

[0104] Figure 12 is a cross-sectional schematic view along Figure 10 the XII-XII line. Figure 12 The cross-section shown is a cross-section perpendicular to the axis A and passing between the first member 10 and the cage 300. In Figure 12 this, the discharge ports 98 projected onto the cross-section are indicated by dashed lines.

[0105] As Figure 12 shown, the first member 10, the second member 20, and the support member 30 form at least one inlet 99. Specifically, the first member 10, the second member 20, and the support member 30 form, for example, three inlets 99. The inlets 99 are located between the insertion hole 95 (refer to Figure 3 ) and the space 92 (refer to Figure 3 ). The inlets 99 connect the insertion hole 95 and the space 92.

[0106] As Figure 12 shown, when observed along the axis A, the discharge ports 98 and the inlets 99 overlap. Specifically, when observed along the axis A, at least one discharge port 98 and at least one inlet 99 overlap. When observed along the axis A, a part of the discharge port 98 may also overlap with the inclined surface 15. In the radial direction, the discharge ports 98 are located at positions between the first inner peripheral surface 12 and the second inner peripheral surface 22.

[0107] As Figure 12 shown, when observed along the axis A, one discharge port 98 overlaps with one inlet 99. The number of the discharge ports 98 is, for example, the same as the number of the inlets 99. There is no particular limitation on the respective numbers of the discharge ports 98 and the inlets 99.

[0108] Next, the effects of the cutting tool 500 according to the present embodiment will be described.

[0109] When cutting with the cutting tool 500, cutting fluid is supplied into the main body 100. As Figure 10As shown, the cutting fluid flows from the cage 300 in the direction of the first arrow 131. Specifically, the cutting fluid flows from the discharge port 98 into the space 92. The cutting fluid is discharged from the space 92 to the outside of the main body 100 through the flow path 50.

[0110] Figure 13 is an enlarged three-dimensional schematic view showing the flow of the cutting fluid in the periphery of the cutting blade 200. Figure 13 The enlarged three-dimensional schematic view shown corresponds to Figure 6 the enlarged three-dimensional schematic view shown. As Figure 13 shown, the cutting fluid discharged from the flow path 50 flows toward the cutting blade 200 along the second arrow 132. The cutting fluid is supplied to the cutting blade 200 as described above.

[0111] In the case where the space 92 is not formed in the main body 100, the cutting fluid flows out to the outside of the main body 100 through the first through-hole 91. Specifically, the cutting fluid is provided between the second fastening screw 400 and the second inner peripheral surface 14 and flows out to the outside of the main body 100 along the third direction 103. The cutting tool 500 according to the present invention has a first member 10 and a second member 20. A space 92 is formed between the first member 10 and the second member 20. The space 92 surrounds the first through-hole 91. A flow path 50 that is connected to the space 92 and opens on the second outer peripheral surface 21 is formed in the second member 20. Therefore, the cutting fluid supplied into the main body 100 flows into the space 92. As a result, the flow rate of the cutting fluid flowing into the first through-hole 91 can be reduced. Therefore, it is possible to suppress the cutting fluid from flowing out to the outside of the main body 100 through the first through-hole 91. As a result, the flow rate of the cutting fluid discharged from the second outer peripheral surface 21 can be increased as compared with the case where the space 92 is not formed.

[0112] According to the cutting tool 500 of the present invention, the space 92 functions as a dedicated flow path for the cutting fluid. Therefore, the pressure loss of the flow of the cutting fluid can be reduced as compared with the case where the space 92 is not formed.

[0113] According to the cutting tool 500 of the present invention, the cutting fluid before flowing into the flow path 50 can be temporarily held in the space 92. As a result, the flow rate of the cutting fluid flowing into each of the plurality of flow paths 50 from the space 92 can be made uniform. As a result, the flow rate of the cutting fluid discharged from each of the plurality of flow paths 50 can be made uniform.

[0114] According to the cutting tool 500 of the present invention, the main body 100 has a support member 30. The support member 30 connects the first outer peripheral surface 11 and the second inner peripheral surface 22. The support member 30 is separated from the first front end surface 1 and the first rear end surface 2, respectively. Therefore, it is possible to suppress the respective vibrations of the first member 10 and the second member 20 when cutting with the cutting tool 500.

[0115] In the cutting tool 500 according to the present invention, when observed along the axis A, the third flow path portion 53 is bent. Therefore, the design freedom of the third flow path portion 53 can be improved while reducing the pressure loss of the cutting fluid flowing in the third flow path portion 53.

[0116] In the cutting tool 500 according to the present invention, the flow path 50 has a first flow path portion 51. The first flow path portion 51 opens toward the rake face 81. Therefore, the cutting edge 84 connected to the rake face 81 can be effectively cooled.

[0117] In the cutting tool 500 according to the present invention, the flow path 50 has a third flow path portion 53. The third flow path portion 53 opens toward the flank face 82. Therefore, the cutting edge 84 connected to the flank face 82 can be effectively cooled.

[0118] When forming the main body 100 using a three-dimensional printer, a support material is required when forming a portion that protrudes in a direction perpendicular to the stacking direction of the three-dimensional printer. In this case, it is necessary to remove the support material from the main body 100. As a result, the time required for forming the main body 100 increases. In the cutting tool 500 according to the present invention, the first member 10 has a first inner peripheral surface 12. The first inner peripheral surface 12 has a second inner peripheral surface portion 14. The diameter of the second inner peripheral surface portion 14 becomes smaller as it separates from the first front end surface 1. In other words, the second inner peripheral surface portion 14 is inclined with respect to the direction perpendicular to the first direction 101. Therefore, when the stacking direction of the three-dimensional printer is the first direction 101, the amount of support material used can be reduced in the formation of the second inner peripheral surface portion 14. As a result, the time required for forming the main body 100 can be reduced.

[0119] In the cutting tool 500 according to the present invention, at least one discharge port 98 is provided in the cage 300. At least one inlet 99 is formed in the main body 100. When observed along the axis A, at least one discharge port 98 overlaps with at least one inlet 99. Therefore, compared with the case where the discharge port 98 and the inlet 99 do not overlap when observed along the axis A, the distance between the discharge port 98 and the inlet 99 becomes shorter. Thereby, when the cutting fluid discharged from the discharge port 98 flows toward the inlet 99, the pressure loss of the cutting fluid can be reduced.

[0120] Examples

[0121] (Sample preparation)

[0122] First, cutting tools 500 related to Sample 1 and Sample 2 were prepared. The cutting tool 500 related to Sample 1 is a comparative example. The cutting tool 500 related to Sample 2 is an example.

[0123] In the cutting tool 500 related to Sample 1, the space 92 is not formed. In other words, in the cutting tool 500 related to Sample 1, the flow path 50 is connected to the first through hole 91. The configuration of the cutting tool 500 related to Sample 2 becomes Figures 10 to 12 the configuration of the cutting tool 500 shown. Specifically, in the cutting tool 500 related to Sample 2, the space 92 is formed.

[0124] (Evaluation method)

[0125] Next, the uniformity of the discharge amount of the cutting fluid was evaluated using the cutting tools 500 related to Sample 1 and Sample 2. Specifically, taking three pocket holes 70 arranged in the rotational direction R as one layer, 15 pocket holes 70 were classified into five layers. In each pocket hole 70 of the five layers, the total value of the amount of the cutting fluid discharged from the opening 150 was measured. The ratio of the amount of the cutting fluid discharged in each of the five layers to the total value of the amount of the cutting fluid discharged from all the openings 150 was calculated.

[0126] (Evaluation results)

[0127] Table 1

[0128]

[0129] Table 1 shows the ratios of the discharge amounts in each column of the cutting tools 500 related to Sample 1 and Sample 2. In Table 1, the first layer refers to the layer closest to the first rear end face 2 within the above five layers. The four layers other than the first layer are the second layer to the fifth layer in order as they are away from the first layer toward the third direction 103.

[0130] As shown in Table 1, in the cutting tool 500 related to Sample 1, the ratios of the discharge amounts from the first layer to the fifth layer are 7% or more and 28% or less. In the cutting tool 500 related to Sample 2, the ratios of the discharge amounts from the first layer to the fifth layer are 18% or more and 21% or less.

[0131] Based on the above results, it was confirmed that, compared with the cutting tool 500 of the comparative example, in the cutting tool 500 of the embodiment, the uniformity of the discharge amount of the cutting fluid is improved in the direction along the axis A.

[0132] It should be considered that the embodiments and examples disclosed herein are illustrative in all aspects and not restrictive. The scope of the present invention is represented not by the above embodiments but by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0133] Description of reference numerals

[0134] 1: First front face (front face); 2: First rear face (rear face); 10: First member; 11: First outer peripheral face; 12: First inner peripheral face; 13: First inner peripheral face portion; 14: Second inner peripheral face portion; 15: Inclined face; 20: Second member; 21: Second outer peripheral face (outermost peripheral face); 22: Second inner peripheral face (inner peripheral face); 30: Support member; 34: Fourth face; 35: Fifth face; 40: Fixing member; 41: First seating face (seating face); 42: Second seating face; 43: Third seating face; 45: Third face; 50: Flow path; 51: First flow path portion; 52: Second flow path portion; 53: Third flow path portion (flow path portion); 54: Fourth flow path portion; 55: Fifth flow path portion; 61: First face; 62: Second face; 68: Outermost peripheral face portion; 70: Pocket hole; 79: Second through hole; 80: Flat surface; 81: Front cutting face; 82: Rear cutting face; 83: Bottom face; 84: Cutting edge; 85: Insertion portion; 86: Base portion; 87: Connection portion; 88: Protrusion portion; 89: Second screw hole; 90: First fastening screw; 91: First through hole (through hole); 92: Space; 93: First screw hole; 94: Groove portion; 95: Insertion hole; 96: Second front face; 97: Second rear face; 98: Discharge port; 99: Inlet port; 100: Main body; 101: First direction; 102: Second direction; 103: Third direction; 131: First arrow; 132: Second arrow; 150: Opening; 151: First opening; 152: Second opening; 153: Third opening; 154: Fourth opening; 155: Fifth opening; 160: Connection port; 200: Cutting insert; 300: Cage; 400: Second fastening screw; 401: Screw portion; 402: Head; 500: Cutting tool; A: Axis; R: Rotation direction; W1: First width; W2: Second width.

Claims

1. A cutting tool that is configured to be rotatable about an axis, wherein, the cutting tool includes: a main body that includes a front end face, a rear end face opposite to the front end face, and an outermost peripheral face that is connected to the front end face and the rear end face respectively and has a pocket formed therein; and a cutting insert that is disposed in the pocket, the main body includes: a first member that surrounds the axis and has a first outer peripheral face; a second member that has an inner peripheral face surrounding the first outer peripheral face and forms each of the front end face, the rear end face, and the outermost peripheral face; a support member that connects the first outer peripheral face and the inner peripheral face and is separated from the front end face and the rear end face respectively; and a fixing member that seals a gap between the first outer peripheral face and the inner peripheral face, a through hole extending along the axis is formed in the first member, a space is formed between the first member and the second member, the space surrounds the through hole, a flow path that is connected to the space and opens in the outermost peripheral face is formed in the second member.

2. The cutting tool according to claim 1, wherein, the flow path has a flow path portion that is curved when viewed along the axis.

3. The cutting tool according to claim 1 or 2, wherein, in a cross section perpendicular to the direction in which the flow path extends, the shape of the flow path is elliptical.

4. The cutting tool according to any one of claims 1 to 3, wherein, in a cross section perpendicular to the direction in which the flow path extends, when the width of the flow path in a first direction from the front end face toward the rear end face is a first width and the width of the flow path in a second direction perpendicular to the first direction is a second width, the first width is larger than the second width.

5. The cutting tool according to any one of claims 1 to 4, wherein, the cutting insert includes a bottom face that contacts the outermost peripheral face and a rake face opposite to the bottom face, the outermost peripheral face has a seating face that contacts the bottom face and a first face that is located in front of the seating face in the rotational direction, the seating face and the first face form the pocket, the flow path has a first flow path portion that opens in the first face, the first flow path portion opens toward the rake face.

6. The cutting tool according to claim 5, wherein, the flow path has a second flow path portion that opens in the first face and is separated from the first flow path portion, the second flow path portion opens toward the rake face, a first opening portion connected to the first flow path portion and a second opening portion connected to the second flow path portion are formed in the first face, the area of the first opening portion is different from the area of the second opening portion.

7. The cutting tool according to claim 5, wherein, the flow path has a second flow path portion that opens in the first face and is separated from the first flow path portion, the second flow path portion opens toward the rake face, When the area of the first flow path portion in a cross-section perpendicular to the direction in which the first flow path portion extends is a first area and the area of the second flow path portion in a cross-section perpendicular to the direction in which the second flow path portion extends is a second area, the first area is different from the second area.

8. The cutting tool according to any one of claims 5 to 7, wherein, the cutting blade includes a flank surface connected to the rake face, the outermost peripheral surface has a second surface that is rearward of the seating surface in the rotational direction and is in a direction from the axis toward the outermost peripheral surface with respect to the seating surface, the flow path has a third flow path portion that opens to the second surface, the third flow path portion opens to the flank surface.

9. The cutting tool according to any one of claims 1 to 8, wherein, the first member includes a first inner peripheral surface that forms the through hole, the first inner peripheral surface has: a first inner peripheral surface portion that extends along the axis; and a second inner peripheral surface portion that is located between the first inner peripheral surface portion and the front end surface and is inclined with respect to the first inner peripheral surface portion, the diameter of the second inner peripheral surface portion decreases as it separates from the front end surface.

10. The cutting tool according to any one of claims 1 to 9, wherein, the cutting tool further includes a cage configured to supply cutting fluid to the space, at least one discharge port is formed in the cage, the first member, the second member, and the support member form at least one inlet connected to the space, when viewed along the axis, the at least one discharge port overlaps with the at least one inlet, the number of the at least one discharge port is the same as the number of the at least one inlet.

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