Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23C—MILLING
  • B23C5/00—Milling-cutters
  • B23C5/28—Features relating to lubricating or cooling
  • B23C5/283—Cutting inserts with internal coolant channels
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23C—MILLING
  • B23C5/00—Milling-cutters
  • B23C5/16—Milling-cutters characterised by physical features other than shape
  • B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
  • B23D77/00—Reaming tools
  • B23D77/006—Reaming tools with means for lubricating or cooling

Definitions

• the present disclosure relates to cutting inserts and rotary cutting tools.
• Patent Document 1 discloses a cutting insert provided with coolant supply holes.
• the cutting insert according to the present disclosure is for use in a rotary cutting tool and comprises a base member and a cutting edge member attached to the base member.
• the cutting edge member has a rake face and a flank face continuous with the rake face. The ridgeline between the rake face and the flank face forms a cutting edge.
• the base member is provided with a flow path through which a fluid passes.
• the base member has a front end face on which the cutting edge member is disposed, a rear end face opposite the front end face, a first side face between the front end face and the rear end face and provided with an inlet of the flow path, and a second side face opposite the first side face and provided with an outlet of the flow path.
• the rear end face is planar.
• the first side face is planar.
• An imaginary plane along the rear end face and an imaginary plane along the first side face are perpendicular.
• a vector in the direction in which the fluid flows out of the outlet and which is parallel to the tangent direction of the outlet of the flow path has a component in the first direction that is perpendicular to the rear end face and extends from the front end face to the rear end face, and the component is positive.
• FIG. 1 is a first perspective schematic view showing the configuration of a cutting insert according to a first embodiment.
• FIG. 2 is a second perspective schematic view showing the configuration of the cutting insert according to the first embodiment.
• FIG. 3 is a cross-sectional schematic view showing the configuration of the cutting insert according to the first embodiment.
• FIG. 4 is a schematic front view showing the shape of the outlet of the flow channel.
• FIG. 5 is a cross-sectional view schematically illustrating the configuration of a cutting insert according to the second embodiment.
• FIG. 6 is a perspective schematic view showing the configuration of a cutting insert according to the third embodiment.
• FIG. 7 is a perspective schematic view showing the configuration of a cutting insert according to a fourth embodiment.
• FIG. 1 is a first perspective schematic view showing the configuration of a cutting insert according to a first embodiment.
• FIG. 2 is a second perspective schematic view showing the configuration of the cutting insert according to the first embodiment.
• FIG. 3 is a cross-sectional schematic view showing the configuration of the cutting insert according
• FIG. 8 is a cross-sectional view schematically illustrating the configuration of a cutting insert according to a fourth embodiment.
• FIG. 9 is a perspective schematic view showing the configuration of the rotary cutting tool according to this embodiment.
• FIG. 10 is a schematic front view showing the configuration of the rotary cutting tool according to this embodiment.
• FIG. 11 is a schematic cross-sectional view taken along line XI-XI in FIG.
• FIG. 12 is a schematic cross-sectional view taken along line XII-XII in FIG.
• FIG. 13 is a schematic cross-sectional view showing a state in which a workpiece is cut using a rotary cutting tool.
• the cutting insert according to the present disclosure is for use in a rotary cutting tool and comprises a base member and a cutting edge member attached to the base member.
• the cutting edge member has a rake face and a flank face continuous with the rake face. The ridgeline of the rake face and the flank face forms a cutting edge.
• the base member is provided with a flow path through which a fluid passes.
• the base member has a front end face on which the cutting edge member is disposed, a rear end face opposite the front end face, a first side face between the front end face and the rear end face and provided with an inlet of the flow path, and a second side face opposite the first side face and provided with an outlet of the flow path.
• the rear end face is planar.
• the first side face is planar.
• An imaginary plane along the rear end face and an imaginary plane along the first side face are perpendicular.
• a vector in which the fluid flows out of the outlet and which is parallel to the tangent direction of the outlet of the flow path has a component in a first direction that is perpendicular to the rear end face and extends from the front end face to the rear end face, and the component is positive. This allows the fluid to be discharged behind the cutting edge, reducing the amount of chips that get into recesses in the workpiece.
• the flow path may have a first flow path portion that forms an inlet and where the fluid accumulates, and a second flow path portion that forms an outlet and is connected to the first flow path portion.
• the width of the outlet in a direction perpendicular to the rake face in a front view of the outlet may be greater than the width of the outlet in a direction parallel to the rake face. This increases the amount of fluid discharged. As a result, it is possible to further reduce the amount of chips entering recesses formed in the workpiece.
• the angle between the direction in which the fluid flows into the inlet and the tangential direction of the inlet of the flow path and the second direction opposite the first direction may be greater than or equal to 0° and less than or equal to 90°, and the angle between the direction in which the fluid flows out of the outlet and the tangential direction of the outlet of the flow path and the second direction may be greater than 90° and less than or equal to 180°.
• This allows the fluid to be released from the outlet of the flow path in an area close to the cutting edge. As a result, it is possible to further reduce the amount of chips entering recesses provided in the workpiece.
• the width of the outlet in a direction perpendicular to the rake face in a front view of the outlet may be greater than the width of the outlet in a direction parallel to the rake face.
• the angle between the direction in which the fluid flows into the inlet and the tangential direction of the inlet of the flow path and a second direction opposite the first direction may be greater than 0° and less than 90°
• the angle between the direction in which the fluid flows out of the outlet and the tangential direction of the outlet of the flow path and the second direction may be greater than 90° and less than 180°.
• a protruding wall portion may be provided on the second side surface.
• the outlet may open to the side surface of the protruding wall portion.
• the protruding wall portion can prevent chips from moving forward of the cutting edge. As a result, it is possible to further reduce chips from entering recesses provided in the workpiece.
• the number of outlets may be two or more.
• a rotary cutting tool is rotatable about an axis and comprises a cutting insert and a main body to which the cutting insert is attached.
• the cutting insert includes a base member and a cutting edge member attached to the base member.
• the cutting edge member has a rake face and a flank face continuous with the rake face. The ridges of the rake face and the flank face form a cutting edge.
• the base member is provided with a flow path through which a fluid passes.
• the base member has a front end face on which the cutting edge member is disposed, a rear end face opposite the front end face, a first side face between the front end face and the rear end face and provided with an inlet of the flow path, and a second side face opposite the first side face and provided with an outlet of the flow path.
• the main body has a first side face facing the workpiece and a second side face opposite the first side face.
• the direction in which the fluid flows out of the outlet and the tangent direction of the outlet of the flow path are parallel to the axis and form an angle greater than 90° and less than 180° with the forward axis extending from the second surface to the first surface. This allows the fluid to be discharged in the direction opposite the direction in which the workpiece is located. As a result, it is possible to reduce the amount of chips entering the recesses in the workpiece.
• the main body may be provided with a third flow path portion through which a fluid passes.
• the third flow path portion may have a main body outlet connected to the flow path, and a main body inlet opposite the main body outlet.
• the angle formed by the direction from the main body inlet toward the main body outlet and the forward axis may be greater than 0° and less than 90°. This allows the fluid to be released from the flow path outlet in an area close to the cutting edge. As a result, it is possible to further reduce the amount of chips entering recesses provided in the workpiece.
• Fig. 1 is a first perspective schematic view showing the configuration of a cutting insert according to a first embodiment.
• the cutting insert 1 according to the first embodiment is for a rotary cutting tool and has a base member 10 and a cutting edge member 20.
• the cutting edge member 20 is attached to the base member 10.
• the cutting edge member 20 has a rake face 21 and a flank face 22.
• the flank face 22 is continuous with the rake face 21.
• the ridge line between the rake face 21 and the flank face 22 forms a cutting edge 23.
• FIG 2 is a second perspective schematic diagram showing the configuration of the cutting insert 1 according to the first embodiment.
• the base member 10 has a front end face 15, a rear end face 16, a first side face 11, a second side face 12, a third side face 13, and a fourth side face 14.
• the front end face 15 faces the workpiece.
• the rear end face 16 is located opposite the front end face 15.
• the rear end face 16 is flat.
• the direction from the front end face 15 to the rear end face 16 is defined as a first direction R1 (see Figure 3).
• the first direction R1 is perpendicular to the rear end face 16.
• the direction opposite to the first direction R1 is defined as a second direction R2 (see Figure 3).
• a cutting edge member 20 is disposed on the front end face 15. A portion of the cutting edge 23 formed by the cutting edge member 20 is located in the second direction R2 relative to the front end face 15.
• the base member 10 has a flow path 50.
• a fluid passes through the flow path 50.
• the fluid is, for example, a coolant, but is not limited to coolant.
• the fluid may be a liquid, a gas, or a mist.
• the base member 10 has an inlet (hereinafter referred to as the first opening 41) for the flow path 50 and an outlet (hereinafter referred to as the second opening 42) for the flow path 50.
• the first opening 41 is provided on the first side surface 11.
• the first side surface 11 is located between the front end surface 15 and the rear end surface 16.
• the first side surface 11 is planar.
• An imaginary plane along the rear end surface 16 and an imaginary plane along the first side surface 11 are perpendicular to each other.
• the second opening 42 is provided on the second side surface 12.
• the second side surface 12 is located opposite the first side surface 11.
• the second side surface 12 is located between the front end surface 15 and the rear end surface 16. The fluid enters the flow path 50 through the first opening 41.
• the base member 10 has a mounting screw arrangement hole 2.
• the mounting screw arrangement hole 2 penetrates the base member 10.
• a mounting screw 3 is arranged in the mounting screw arrangement hole 2 (see Figure 9).
• the mounting screw arrangement hole 2 opens to each of the first side surface 11 and the second side surface 12. In a direction parallel to the first direction R1, the mounting screw arrangement hole 2 is located between the second opening 42 and the rear end face 16.
• the cutting insert 1 is attached to the main body portion 70 using the mounting screw 3 (see Figure 9).
• the fourth side surface 14 is opposite the third side surface 13. In the direction from the third side surface 13 toward the fourth side surface 14, the cutting edge member 20 is disposed between the third side surface 13 and the fourth side surface 14. In the direction parallel to the first direction R1, each of the third side surface 13 and the fourth side surface 14 is located between the front end surface 15 and the rear end surface 16.
• FIG. 3 is a cross-sectional schematic diagram showing the configuration of the cutting insert 1 according to the first embodiment.
• the cross section shown in FIG. 3 is parallel to the first direction R1 and intersects with each of the inlet and outlet of the flow path 50.
• the flow path 50 has a first flow path section 51 and a second flow path section 52.
• the first flow path section 51 forms the inlet (first opening 41) of the flow path 50. Fluid accumulates in the first flow path section 51.
• the second flow path section 52 forms the outlet (second opening 42) of the flow path 50.
• the second flow path section 52 is connected to the first flow path section 51.
• the second flow path section 52 is located downstream of the first flow path section 51.
• the volume of the first flow path section 51 may be larger than the volume of the second flow path section 52.
• a third opening 43 is provided on the side of the first flow path section 51.
• the third opening 43 is the inlet of the second flow path section 52.
• the fluid enters the second flow path section 52 through the third opening 43.
• the direction in which the fluid enters the first flow path section 51 through the first opening 41 is referred to as the first flow direction A1.
• the first flow direction A1 may be, for example, perpendicular to the second direction R2, or may be inclined with respect to a line perpendicular to the second direction R2.
• the direction in which the fluid enters the second flow path section 52 through the third opening 43 is referred to as the second flow direction A2.
• the second flow direction A2 is, for example, substantially the same direction as the second direction R2.
• the cross section shown in FIG. 3 includes the center of the second opening 42 and the center of the third opening 43.
• the center of an opening is defined as the midpoint between the two points where the opening intersects with a straight line in the direction in which the width of the opening is greatest, as viewed in the direction of fluid flow through the opening.
• the direction in which the fluid flows out of the second opening 42 and is also tangential to the second opening 42 is the third flow direction A3.
• a vector parallel to the third flow direction A3 has a component in the first direction R1. This component is positive.
• the angle between the third flow direction A3 and the second direction R2 (hereinafter referred to as the first angle ⁇ 1) is greater than 90° and less than 180°.
• the first angle ⁇ 1 may be greater than 100°, greater than 110°, or greater than 120°.
• the first angle ⁇ 1 may be less than 170°, less than 160°, or less than 150°.
• the tangential direction of the second opening 42 is measured at a position in the second flow path section 52 closest to the second opening 42, excluding the chamfered portion of the second opening 42.
• a protruding wall portion 19 is provided on the second side surface 12.
• the protruding wall portion 19 is continuous with the front end surface 15.
• the protruding wall portion 19 has a first region 31 and a second region 32.
• the first region 31 extends along the first direction R1.
• the second region 32 is continuous with the first region 31.
• the second region 32 is located closer to the first region 31 in the first direction R1.
• the second region 32 is inclined with respect to the first region 31.
• the second region 32 is located on the opposite side of the front end surface 15 from the first region 31.
• the outlet of the flow path 50 is provided in the second region 32.
• the second side surface 12 has a third region 33 and a fourth region 34.
• the third region 33 is located in the first direction R1 relative to the second region 32.
• the third region 33 is continuous with the second region 32 (see Figure 1).
• the third region 33 is curved in a concave manner.
• the fourth region 34 is located in the first direction R1 relative to the third region 33.
• the fourth region 34 is continuous with the third region 33.
• the fourth region 34 extends along the first direction R1.
• the mounting screw arrangement hole 2 opens into the fourth region 34.
• Chips of the workpiece cut by the cutting edge 23 move from the cutting edge 23 toward the third region 33, where they curl and break apart.
• the broken chips are blown in the third flow direction A3 by the fluid exiting the second opening 42 of the flow path 50. Note that some of the fluid exiting the second opening 42 of the flow path 50 may hit the third region 33.
• FIG. 4 is a schematic front view showing the shape of the outlet of the flow path 50.
• the second opening 42 which is the outlet of the flow path 50, has an elongated shape.
• first width W1 the width of the outlet in a direction perpendicular to the rake face 21
• second width W2 the width of the outlet in a direction parallel to the rake face 21
• first width W1 may be 1.5 times or more, or may be 2 times or more, the second width W2.
• the first width W1 may be 10 times or less, or may be 5 times or less, the second width W2.
• the cutting insert 1 according to the second embodiment is substantially the same as the cutting insert 1 according to the first embodiment, except that the fluid flow path 50 does not have a flow path portion where the fluid accumulates.
• the following description will focus on the configuration that differs from the cutting insert 1 according to the first embodiment.
• FIG. 5 is a cross-sectional schematic diagram showing the configuration of a cutting insert 1 according to the second embodiment.
• the cross-sectional view shown in FIG. 5 corresponds to the cross-sectional view shown in FIG. 3.
• the fluid flow path 50 does not have a flow path portion where the fluid accumulates.
• the width of the flow path 50 in the second direction R2 may continuously decrease.
• the first opening 41 forming the inlet of the flow path 50 has a first opening end 41a and a second opening end 41b. In the second direction R2, the second opening end 41b is located between the first opening end 41a and the front end face 15.
• the direction in which the fluid flows into the flow path 50 and is also the tangent direction of the flow path 50 at the first opening end 41a is defined as the seventh tangent direction A7.
• the angle between the second direction R2 and the seventh tangent direction A7 is defined as the seventh angle ⁇ 7.
• the direction in which the fluid flows into the flow path 50 and is also the tangent direction of the flow path 50 at the second opening end 41b is defined as the eighth tangent direction A8.
• the angle between the second direction R2 and the eighth tangent direction A8 is defined as the eighth angle ⁇ 8.
• the direction in which the fluid flows into the inlet and is also the angle between the tangent direction of the inlet of the flow path 50 and the second direction R2 is defined as the second angle ⁇ 2.
• the second angle ⁇ 2 is defined as the average value of the seventh angle ⁇ 7 and the eighth angle ⁇ 8.
• the tangential direction of the flow path 50 at the first opening end 41a is measured at a position on the flow path 50 closest to the first opening end 41a, excluding the chamfered portion on the first opening end 41a.
• the tangential direction of the flow path 50 at the second opening end 41b is measured at a position on the flow path 50 closest to the second opening end 41b, excluding the chamfered portion on the second opening end 41b.
• the second angle ⁇ 2 is greater than or equal to 0° and less than or equal to 90°.
• the second angle ⁇ 2 may be greater than or equal to 10°, or may be greater than or equal to 20°.
• the second angle ⁇ 2 may be less than or equal to 80°, or may be less than or equal to 70°.
• the cutting insert 1 according to the third embodiment differs from the cutting insert 1 according to the first embodiment mainly in that the number of outlets of the flow path 50 is two or more, and other configurations are substantially the same as those of the cutting insert 1 according to the first embodiment.
• the configurations different from the cutting insert 1 according to the first embodiment will be mainly described.
• FIG. 6 is a schematic perspective view showing the configuration of a cutting insert 1 according to a third embodiment.
• the number of outlets (second openings 42) of the flow path 50 may be two.
• the second flow path section 52 may branch into two from the first flow path section 51.
• the fluid outlets may be arranged side by side in a direction perpendicular to the rake face 21.
• the number of outlets of the flow path 50 is not limited to two.
• the number of outlets of the flow path 50 may be three, or four or more.
• the cutting insert 1 according to the fourth embodiment differs from the cutting insert 1 according to the first embodiment mainly in that the flow path 50 has two outlets and the orientation of the outlets is different, but the other configurations are substantially the same as those of the cutting insert 1 according to the first embodiment. Below, the configurations different from those of the cutting insert 1 according to the first embodiment will be mainly described.
• FIG. 7 is a schematic perspective view showing the configuration of a cutting insert 1 according to a fourth embodiment.
• FIG. 8 is a schematic cross-sectional view showing the configuration of a cutting insert 1 according to a fourth embodiment.
• the cross-sectional view shown in FIG. 8 corresponds to the cross-sectional view shown in FIG. 3.
• the flow path 50 has a first flow path section 51, a second flow path section 52, and a fourth flow path section 54.
• the first flow path section 51 has a first opening 41.
• the first opening 41 is the inlet of the first flow path section 51.
• the second flow path section 52 has a second opening 42 and a third opening 43.
• the second opening 42 is the outlet of the second flow path section 52.
• the second flow path section 52 is connected to the first flow path section 51.
• the third opening 43 is the inlet of the second flow path section 52 and the outlet of the first flow path section 51.
• the fourth flow path section 54 has a fourth opening 44 and a fifth opening 45.
• the fourth opening 44 is the outlet of the fourth flow path section 54.
• the fourth flow path section 54 is connected to the first flow path section 51.
• the fifth opening 45 is the inlet of the fourth flow path section 54 and the outlet of the first flow path section 51.
• the fluid enters the fourth flow path section 54 through the fifth opening 45.
• the direction in which the fluid enters the fourth flow path section 54 through the fifth opening 45 is referred to as the fifth flow direction A5.
• the fifth flow direction A5 is, for example, substantially the same direction as the second direction R2.
• the direction in which the fluid flows out of the fourth opening 44 and is also tangential to the fourth opening 44 is defined as the fourth flow direction A4.
• the fourth flow direction A4 is different from the third flow direction A3. When viewed in a direction perpendicular to the rake face 21, the fourth flow direction A4 may intersect with the cutting edge 23.
• the fourth flow direction A4 may be substantially the same direction as the first flow direction A1.
• the tangential direction of the fourth opening 44 is measured at a position in the fourth flow path section 54 closest to the fourth opening 44, excluding the chamfered portion of the fourth opening 44.
• the fourth opening 44 is provided in the first region 31 of the protruding wall portion 19.
• the second opening 42 is provided in the second region 32 of the protruding wall portion 19.
• the fourth opening 44 is located between the front end face 15 and the second opening 42.
• the fifth opening 45 is located between the third opening 43 and the first side surface 11.
• FIG. 9 is a schematic perspective view showing the configuration of a rotary cutting tool according to this embodiment.
• the rotary cutting tool according to this embodiment is, for example, a milling cutter.
• the rotary cutting tool is rotatable around an axis B.
• the rotary cutting tool mainly comprises a main body 70, a cutting insert 1, a mounting screw 3, and a position adjustment screw 4.
• the cutting insert 1 is attached to the main body 70.
• the main body 70 has a first surface 71, a second surface 72, an outer peripheral surface 73, and an inner peripheral surface 74.
• the first surface 71 is the surface facing the workpiece.
• the second surface 72 is opposite the first surface 71.
• the second surface 72 faces the spindle of the machine tool.
• the outer peripheral surface 73 is continuous with each of the first surface 71 and the second surface 72. In the direction along the axis B, the outer peripheral surface 73 is located between the first surface 71 and the second surface 72.
• a plurality of cutting inserts 1 are arranged at the boundary between the first surface 71 and the outer peripheral surface 73. The plurality of cutting inserts 1 are arranged at equal intervals along the rotational direction.
• the cutting insert 1 is attached to the main body 70 using a mounting screw 3.
• the position adjustment screw 4 adjusts the position of the cutting insert 1 in the direction along the axis B. In the direction along the axis B, the position adjustment screw 4 is located between the cutting insert 1 and the second surface 72. A corresponding position adjustment screw 4 is provided for each of the multiple cutting inserts 1.
• FIG. 10 is a schematic front view showing the configuration of a rotary cutting tool according to this embodiment.
• a third flow path portion 80 is provided in the main body portion 70.
• a fluid passes through the third flow path portion 80.
• the third flow path portion 80 extends from the inner circumferential surface 74 of the main body portion 70 toward the outer circumferential surface 73.
• the third flow path portion 80 has a main body inlet 81 and a main body outlet 82.
• the main body inlet 81 opens to the inner circumferential surface 74.
• the main body outlet 82 is located opposite the main body inlet 81.
• the third flow path portion 80 when viewed along the axis B, the third flow path portion 80 extends linearly.
• a plurality of third flow path portions 80 are provided to correspond to each of the plurality of cutting inserts 1.
• FIG. 11 is a schematic cross-sectional view taken along line XI-XI in FIG. 10.
• the schematic cross-sectional view shown in FIG. 11 is parallel to the axis B and intersects with the outlet and inlet of the flow path 50 provided in the cutting insert 1.
• the cross section shown in FIG. 11 includes the center of the second opening 42, which is the outlet of the second flow path portion 52, and the center of the third opening 43, which is the inlet of the second flow path portion 52.
• the third flow direction A3 is the direction in which the fluid flows out from the outlet of the cutting insert 1 and is tangential to the outlet of the flow path 50 of the cutting insert 1.
• the forward axial direction R3 is parallel to the axis B and is a direction from the second surface 72 toward the first surface 71.
• the angle formed by the third flow direction A3 and the forward axial direction R3 (hereinafter also referred to as the tenth angle ⁇ 10) is greater than 90° and less than or equal to 180°.
• the tenth angle ⁇ 10 is substantially the same as the first angle ⁇ 1.
• the tenth angle ⁇ 10 may be greater than 100°, greater than 110°, or greater than 120°.
• the tenth angle ⁇ 10 may be equal to or less than 170°, equal to or less than 160°, or equal to or less than 150°.
• Figure 12 is a schematic cross-sectional view taken along line XII-XII in Figure 10.
• the schematic cross-sectional view shown in Figure 12 is parallel to axis B and intersects with each of the main body inlet 81 and the main body outlet 82.
• the cross section shown in Figure 12 includes the center of the main body inlet 81 and the center of the main body outlet 82.
• the main body outlet 82 of the third flow path portion 80 is connected to the flow path 50 of the cutting insert 1.
• the fluid that leaves the main body outlet 82 enters the first flow path portion 51 provided in the cutting insert 1 from the first opening 41 of the cutting insert 1.
• the fluid that enters the first flow path portion 51 passes through the second flow path portion 52 and is released to the outside of the cutting insert 1 from the second opening 42.
• the direction from the main body inlet 81 to the main body outlet 82 is the sixth flow direction A6.
• the angle between the sixth flow direction A6 and the forward axis R3 (hereinafter also referred to as the third angle ⁇ 3) is greater than 0° and less than or equal to 90°.
• the center of the main body inlet 81 is determined at the cross section closest to the main body inlet 81 among the cross sections in which the contour of the third flow path section 80 is continuously continuous when the third flow path section 80 is virtually cut along a plane perpendicular to the sixth flow direction A6.
• the center of the main body outlet 82 is determined at the cross section closest to the main body outlet 82 among the cross sections in which the contour of the third flow path section 80 is continuously continuous when the third flow path section 80 is virtually cut along a plane perpendicular to the sixth flow direction A6.
• the center of the inlet or outlet is defined as the midpoint between the two points where the flow path intersects with a straight line in the direction in which the width of the flow path in the cross section is at its maximum, when viewed in a direction perpendicular to the cross section.
• the third angle ⁇ 3 may be greater than 10°, greater than 20°, or greater than 30°.
• the third angle ⁇ 3 may be equal to or less than 80°, equal to or less than 70°, or equal to or less than 60°.
• FIG. 13 is a schematic cross-sectional view showing a state in which a workpiece is cut using a rotary cutting tool. 13 , the rotary cutting tool 100 is positioned so that the first surface 71 of the rotary cutting tool 100 faces the workpiece 90.
• the workpiece 90 is, for example, an engine block.
• a plurality of recesses 92 are formed in the workpiece surface 91 of the engine block.
• a coolant fluid is introduced into the third flow path portion 80 of the main body 70. After passing through the third flow path portion 80 of the main body 70, the coolant enters the flow path 50 of the cutting insert 1 and is released to the outside of the cutting insert 1 along the third flow direction A3. Chips of the workpiece 90 cut by the cutting edge 23 move over the rake face 21 and are curled and broken in the third region 33. The broken chips are blown in the third flow direction A3 by the coolant. Some of the coolant cools the cutting edge 23.
• the rotary cutting tool 100 has been described above as being a milling cutter, the rotary cutting tool 100 is not limited to being a milling cutter.
• the rotary cutting tool 100 may also be, for example, a reamer.
• the vector in which the fluid flows out of the outlet and which is parallel to the tangent direction of the outlet of the flow path 50 has a component in the first direction R1 directed from the front end face 15 to the rear end face 16, and this component is positive. This allows the fluid to be discharged behind the cutting edge 23. As a result, it is possible to reduce the amount of chips that get into the recess 92 provided in the workpiece 90.
• the flow path 50 may have a first flow path portion 51 that forms an inlet and where the fluid accumulates, and a second flow path portion 52 that forms an outlet and is connected to the first flow path portion 51. This allows the cutting insert 1 to be made lighter. As a result, the rotary cutting tool 100 can be rotated at high speeds.
• the width of the outlet in a direction perpendicular to the rake face 21 may be greater than the width of the outlet in a direction parallel to the rake face 21 in a front view of the outlet. This increases the amount of fluid discharged. As a result, it is possible to further reduce the amount of chips entering the recess 92 provided in the workpiece 90.
• the angle between the tangential direction of the inlet of the flow channel 50, which is the direction in which the fluid flows into the inlet, and the second direction R2, which is the opposite direction to the first direction R1 may be between 0° and 90°
• the angle between the tangential direction of the outlet of the flow channel 50, which is the direction in which the fluid flows out of the outlet, and the second direction R2 may be between 90° and 180°.
• a protruding wall portion 19 may be provided on the second side surface 12.
• the outlet may open to the side surface of the protruding wall portion 19.
• the protruding wall portion 19 can prevent chips from moving forward of the cutting edge 23. As a result, it is possible to further reduce chips from entering the recess 92 provided in the workpiece 90.
• the angle formed by the direction in which the fluid flows out of the outlet, which is tangential to the outlet of the flow path 50, and the forward axial direction R3, which is parallel to the axis B and extends from the second surface 72 to the first surface 71, is greater than 90° and not greater than 180°. This allows the fluid to be discharged in the direction opposite to the direction in which the workpiece 90 is located. As a result, it is possible to reduce the amount of chips entering the recess 92 provided in the workpiece 90.
• the angle formed by the direction from the main body inlet 81 toward the main body outlet 82 and the forward axial direction R3 may be greater than 0° and less than or equal to 90°. This allows fluid to be effectively introduced through the third flow path portion 80 of the main body portion 70 to the flow path 50 of the cutting insert 1 attached near the boundary between the outer peripheral surface 73 of the main body portion 70 and the first surface 71.
• Cutting insert 2. Mounting screw arrangement hole, 3. Mounting screw, 4. Position adjustment screw, 10. Base member, 11. First side surface, 12. Second side surface, 13. Third side surface, 14. Fourth side surface, 15. Front end surface, 16. Rear end surface, 19. Protruding wall portion, 20. Cutting edge member, 21. Rake face, 22. Relief face, 23. Cutting edge, 31. First region, 32. Second region, 33. Third region, 34. Fourth region, 41. First opening, 41a. First opening end, 41b. Second opening end, 42. Second opening, 43. Third opening, 44. Fourth opening, 45. Fifth opening, 50. Flow path, 51.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Milling Processes (AREA)
• Cutting Tools, Boring Holders, And Turrets (AREA)

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• 2024
  • 2024-02-26 JP JP2024550807A patent/JP7575647B1/ja active Active
  • 2024-02-26 EP EP24808843.7A patent/EP4631657A4/en active Pending
  • 2024-02-26 WO PCT/JP2024/006788 patent/WO2025181857A1/ja active Pending
  • 2024-02-26 CN CN202480002696.3A patent/CN120857998A/zh active Pending

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