WO2023243005A1 - Foret - Google Patents

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Publication number
WO2023243005A1
WO2023243005A1 PCT/JP2022/023991 JP2022023991W WO2023243005A1 WO 2023243005 A1 WO2023243005 A1 WO 2023243005A1 JP 2022023991 W JP2022023991 W JP 2022023991W WO 2023243005 A1 WO2023243005 A1 WO 2023243005A1
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WO
WIPO (PCT)
Prior art keywords
outer circumferential
axis
outer peripheral
diameter
drill
Prior art date
Application number
PCT/JP2022/023991
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English (en)
Japanese (ja)
Inventor
直宏 中村
Original Assignee
住友電工ハードメタル株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友電工ハードメタル株式会社 filed Critical 住友電工ハードメタル株式会社
Priority to PCT/JP2022/023991 priority Critical patent/WO2023243005A1/fr
Priority to JP2022567118A priority patent/JP7206573B1/ja
Publication of WO2023243005A1 publication Critical patent/WO2023243005A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines

Definitions

  • the present disclosure relates to a drill.
  • Patent Document 1 JP-A-6-15512 (Patent Document 1) describes a drill in which a margin portion is formed.
  • a drill according to the present disclosure is a drill that rotates around an axis and includes a cutting edge, a helical groove surface, a first outer peripheral margin surface, and an approach surface.
  • the helical groove surface is continuous with the cutting edge.
  • the first outer peripheral margin surface is located at the rear of the outermost peripheral end of the cutting blade in the rotational direction and has a diameter larger than the diameter of the cutting blade.
  • the approach surface is located between the first outer peripheral margin surface and the helical groove surface, continues to the outermost peripheral end, and is formed along the leading edge of the helical groove surface. When viewed in the direction along the axis, the approach surface is inclined with respect to the first peripheral margin surface.
  • the length of the approach surface in the direction parallel to the axis is 0.5 times or more the diameter of the first outer peripheral margin surface.
  • FIG. 1 is a schematic plan view showing the configuration of a drill according to the first embodiment.
  • FIG. 2 is a schematic front view showing the configuration of the drill according to the first embodiment.
  • FIG. 3 is an enlarged front view of region III in FIG.
  • FIG. 4 is a schematic perspective view showing the front end portion of the drill according to the first embodiment.
  • FIG. 5 is an enlarged schematic diagram of region V in FIG.
  • FIG. 6 is a schematic diagram showing a state in which the cutting edge is rotationally projected onto a rotational projection plane including the axis when the drill is rotated around the axis.
  • FIG. 7 is a schematic cross-sectional view taken along line VII-VII in FIG.
  • FIG. 8 is a schematic front view showing the configuration of a drill according to the second embodiment.
  • FIG. 9 is a schematic plan view showing the configuration of a drill according to the second embodiment.
  • FIG. 10 shows the diameter of the hole formed using the drill according to Sample 1.
  • FIG. 11 shows the diameter of the hole formed
  • An object of the present disclosure is to provide a drill capable of drilling holes with high precision.
  • the drill 100 is a drill 100 that rotates around an axis X, and includes a cutting edge 3, a helical groove surface 5, a first outer peripheral margin surface 10, and an approach surface 8. ing.
  • the twisted groove surface 5 is continuous with the cutting edge 3.
  • the first outer peripheral margin surface 10 is located at the rear of the outermost peripheral end of the cutting blade 3 in the rotational direction, and has a diameter larger than the diameter of the cutting blade 3.
  • the approach surface 8 is located between the first outer peripheral margin surface 10 and the helical groove surface 5 , continues to the outermost peripheral end, and is formed along the leading edge 7 of the helical groove surface 5 . Viewed in the direction along the axis X, the approach surface 8 is inclined with respect to the first outer peripheral margin surface 10. The length of the approach surface 8 in the direction parallel to the axis X is 0.5 times or more the diameter of the first outer peripheral margin surface 10.
  • the value obtained by subtracting the diameter of the cutting edge 3 from the diameter of the first outer peripheral margin surface 10 may be 0.01 mm or more and 0.08 mm or less.
  • the width of the approach surface 8 may be 0.1 mm or more and 0.4 mm or less.
  • the inclination angle of the approach surface 8 with respect to the first outer peripheral margin surface 10 is 3° or more and 15° or less when viewed in the direction along the axis X. It may be.
  • the core thickness of the drill 100 may be 28% or more and 40% or less of the diameter of the first outer peripheral margin surface 10.
  • the central angle of the twisted groove surface 5 may be 0.5 times or more and 1 time or less of the central angle of the portion other than the twisted groove surface 5.
  • the drill further includes a second outer circumferential margin surface 20 that is spaced apart from the first outer circumferential margin surface 10 and located at the rear of the first outer circumferential margin surface 10 in the rotational direction. It's okay.
  • the width of each of the first outer circumferential margin surface 10 and the second outer circumferential margin surface 20 may be 5% or more and 20% or less of the diameter of the first outer circumferential margin surface 10.
  • the front end of the second outer circumferential margin surface 20 may be located axially rearward than the front end of the first outer circumferential margin surface 10.
  • the amount of retraction of the second outer circumferential margin surface 20 with respect to the first outer circumferential margin surface 10 may be 2% or more and 10% or less of the diameter of the first outer circumferential margin surface 10.
  • flank surface 40 continuous to the cutting edge 3 and the outer circumferential intermediate surface 4 between the first outer circumferential margin surface 10 and the second outer circumferential margin surface 20 are provided. You may also have more.
  • the flank 40 includes a first flank part 43 and a first chamfer face part 41 that is located on the outer peripheral side of the first flank part 43, is inclined with respect to the first flank part 43, and is continuous with the first flank part 43. It may have.
  • the first chamfer surface portion 41 may be continuous with the outer circumferential intermediate surface 4.
  • the flank 40 includes the second flank part 44 which is located rearward in the rotational direction of the first flank part 43 and is connected to the first flank part 43;
  • the second chamfer surface portion 42 may be located rearward in the rotational direction of the second flank portion 44 and connected to the second outer peripheral margin surface 20 .
  • the drill 100 may further include a flank 40 continuous to the cutting edge 3.
  • the flank 40 includes a first flank part 43 and a first chamfer face part 41 that is located on the outer peripheral side of the first flank part 43, is inclined with respect to the first flank part 43, and is continuous with the first flank part 43. It may have.
  • the cutting edge 3 may have a main cutting edge portion 32 continuous to the first flank portion 43 and a chamfer cutting edge portion 33 continuous to the first chamfer surface portion 41 .
  • the rotation locus of the axis X and the rotation locus of the chamfer cutting edge 33 form on a rotational projection plane in which the cutting edge 3 is projected onto a plane including the axis X.
  • the angle may be greater than or equal to 15° and less than or equal to 45°.
  • the length of the chamfer cutting edge portion 33 in the direction parallel to the axis X is 3% or more and 10% or less of the diameter of the first outer peripheral margin surface 10. It's okay.
  • the drill 100 may further include a flank 40 continuous to the cutting edge 3. Coolant supply holes 30 may be provided in the flank 40 .
  • the drill 100 further includes a second outer circumferential margin surface 20 that is spaced apart from the first outer circumferential margin surface 10 and located rearward of the first outer circumferential margin surface 10 in the rotational direction. It's okay.
  • the value obtained by subtracting the diameter of the cutting edge 3 from the diameter of the first outer peripheral margin surface 10 may be 0.01 mm or more and 0.08 mm or less.
  • the width of the approach surface 8 may be 0.1 mm or more and 0.4 mm or less.
  • the inclination angle of the approach surface 8 with respect to the first outer peripheral margin surface 10 may be 3° or more and 15° or less.
  • each of the first outer circumferential margin surface 10 and the second outer circumferential margin surface 20 may be 5% or more and 20% or less of the diameter of the first outer circumferential margin surface 10.
  • the front end of the second outer circumferential margin surface 20 is located axially rearward than the front end of the first outer circumferential margin surface 10, and the second outer circumferential margin surface is opposite to the first outer circumferential margin surface 10.
  • the amount of recess 20 may be 2% or more and 10% or less of the diameter of the first outer circumferential margin surface 10.
  • FIG. 1 is a schematic plan view showing the configuration of a drill 100 according to the first embodiment.
  • the drill 100 according to the first embodiment includes a front end 1, a rear end 2, a flank surface 40, a thinning surface 6, an outer peripheral surface 9, a twisted groove surface 5, and a shank 17. It mainly has The drill 100 according to the first embodiment is a drill 100 for metal processing.
  • the outer peripheral surface 9 is provided in a spiral shape around the axis X.
  • the outer circumferential surface 9 is continuous with the twisted groove surface 5.
  • the twisted groove surface 5 constitutes a flute.
  • the twisted groove surface 5 is provided in a spiral shape around the axis X.
  • the cutting edge 3 is provided at a position close to the front end 1 of the drill 100.
  • the front end 1 of the drill 100 is the part that faces the workpiece.
  • the rear end 2 of the drill 100 is a portion facing the tool main shaft that rotates the drill 100.
  • the shank 17 is a part attached to the tool spindle.
  • the axis X passes through the front end 1 and the rear end 2.
  • Drill 100 rotates around axis X.
  • the direction along axis X is the axial direction.
  • the direction perpendicular to the axial direction is the radial direction.
  • the direction from the front end 1 to the rear end 2 is referred to as the rear in the axial direction.
  • the direction from the rear end 2 to the front end 1 is referred to as the front in the axial direction.
  • the direction parallel to the radial direction and away from the axis X is referred to as the outer peripheral side.
  • FIG. 2 is a schematic front view showing the configuration of the drill 100 according to the first embodiment.
  • the flank 40 is continuous with the cutting edge 3.
  • the ridgeline between the flank surface 40 and the helical groove surface 5 constitutes the cutting edge 3.
  • the helical groove surface 5 close to the cutting edge 3 functions as a rake surface.
  • the flank surface 40 has a first flank section 43 , a first chamfer surface section 41 , a second flank section 44 , and a second chamfer surface section 42 .
  • the first flank portion 43 is continuous with the cutting blade 3.
  • the first chamfer surface part 41 is continuous with the first flank part 43.
  • the first chamfer surface portion 41 is located closer to the outer circumference than the first flank portion 43 .
  • the first chamfer surface part 41 is inclined with respect to the first flank part 43.
  • the second flank part 44 is located at the rear of the first flank part 43 in the rotational direction.
  • the second flank part 44 is continuous with the first flank part 43.
  • the second flank part 44 is inclined with respect to the first flank part 43.
  • the second chamfer surface portion 42 is located further rearward than the second flank portion 44 in the rotational direction.
  • the second chamfer surface portion 42 is continuous with the second flank portion 44 .
  • the second chamfer surface section 42 is inclined with respect to the second flank section 44 .
  • the outer circumferential surface 9 of the drill 100 has a first outer circumferential margin surface 10, a second outer circumferential margin surface 20, an outer circumferential intermediate surface 4, a first side surface 11, and a second side surface 12.
  • the second outer peripheral margin surface 20 is spaced apart from the first outer peripheral margin surface 10.
  • the second outer circumferential margin surface 20 is located further rearward than the first outer circumferential margin surface 10 in the rotational direction.
  • the outer circumferential intermediate surface 4 is located between the first outer circumferential margin surface 10 and the second outer circumferential margin surface 20.
  • the first side surface 11 is continuous with each of the first outer peripheral margin surface 10 and the outer peripheral intermediate surface 4.
  • the first side surface 11 is located between the first outer peripheral margin surface 10 and the outer peripheral intermediate surface 4.
  • the second side surface 12 is continuous with each of the second outer peripheral margin surface 20 and the outer peripheral intermediate surface 4.
  • the second side surface 12 is located between the second outer peripheral margin surface 20 and the outer peripheral intermediate surface 4.
  • the width of the first outer peripheral margin surface 10 is a first width W1.
  • the first width W1 is, for example, 5% or more and 20% or less of the diameter of the first outer peripheral margin surface 10.
  • the first outer peripheral margin surface 10 has an arcuate shape.
  • the width of the first outer peripheral margin surface 10 is the length of a line segment connecting both ends of the arc-shaped first outer peripheral margin surface 10.
  • the lower limit of the first width W1 is not particularly limited, but may be, for example, 7% or more of the diameter of the first outer peripheral margin surface 10, or 9% or more.
  • the upper limit of the first width W1 is not particularly limited, but may be, for example, 18% or less or 16% or less of the diameter of the first outer peripheral margin surface 10.
  • the width of the second outer peripheral margin surface 20 is a second width W2.
  • the second width W2 is, for example, 5% or more and 20% or less of the diameter of the first outer peripheral margin surface 10.
  • the shape of the second outer peripheral margin surface 20 is arcuate.
  • the width of the second outer circumferential margin surface 20 is the length of a line segment connecting both ends of the arc-shaped second outer circumferential margin surface 20.
  • the lower limit of the second width W2 is not particularly limited, but may be, for example, 7% or more or 9% or more of the diameter of the first outer peripheral margin surface 10.
  • the upper limit of the second width W2 is not particularly limited, but may be, for example, 18% or less or 16% or less of the diameter of the first outer peripheral margin surface 10.
  • the first outer peripheral margin surface 10 is continuous with the first chamfer surface portion 41.
  • the first chamfer surface section 41 is continuous with each of the first flank section 43 and the second flank section 44 .
  • the first chamfer surface portion 41 may be continuous with the outer circumferential intermediate surface 4.
  • the second outer peripheral margin surface 20 is continuous with the second chamfer surface portion 42.
  • the second chamfer surface portion 42 may be continuous with the outer circumferential intermediate surface 4.
  • Coolant supply holes 30 may be provided in the flank 40 .
  • the coolant supply hole 30 may be open at the second flank portion 44 .
  • the cutting edge 3 is continuous with the helical groove surface 5.
  • the cutting edge 3 has a thinning cutting edge portion 31, a main cutting edge portion 32, and a chamfer cutting edge portion 33.
  • the main cutting edge portion 32 is continuous with the thinning cutting edge portion 31.
  • the main cutting edge portion 32 is located on the outer peripheral side of the thinning cutting edge portion 31.
  • the chamfer cutting edge portion 33 is continuous with the main cutting edge portion 32.
  • the chamfer cutting edge portion 33 is located on the outer peripheral side of the main cutting edge portion 32.
  • the main cutting edge portion 32 is continuous with the first flank portion 43 .
  • the chamfer cutting edge portion 33 is continuous with the first chamfer surface portion 41.
  • FIG. 3 is an enlarged front view of region III in FIG. 2.
  • the drill 100 according to the first embodiment has an approach surface 8.
  • the approach surface 8 is continuous with the chamfer cutting edge portion 33 at the outermost peripheral end of the cutting edge 3.
  • the approach surface 8 is inclined with respect to the chamfer cutting edge 33 when viewed in the direction along the axis X.
  • the approach surface 8 is located at the rear of the chamfer cutting edge portion 33 in the rotational direction.
  • the first outer peripheral margin surface 10 is continuous with the approach surface 8.
  • the first outer peripheral margin surface 10 is located at the rear of the approach surface 8 in the rotational direction.
  • the first outer peripheral margin surface 10 is located at the rear of the outermost peripheral end of the cutting blade 3 in the rotational direction.
  • the approach surface 8 is located between the outermost peripheral end of the cutting edge 3 and the first outer peripheral margin surface 10.
  • the diameter of the cutting blade 3 when viewed in the direction along the axis X is a second diameter D2.
  • the diameter of the first outer peripheral margin surface 10 is a first diameter D1.
  • the first diameter D1 is larger than the second diameter D2.
  • the second diameter D2 is twice the distance between the outermost peripheral end of the cutting blade 3 and the axis X.
  • the first diameter D1 is twice the distance between the first outer peripheral margin surface 10 and the axis X.
  • the value obtained by subtracting the second diameter D2 from the first diameter D1 is, for example, 0.01 mm or more and 0.08 mm or less.
  • the lower limit of the value obtained by subtracting the second diameter D2 from the first diameter D1 is not particularly limited, but may be, for example, 0.02 mm or more, or 0.03 mm or more.
  • the lower limit of the value obtained by subtracting the second diameter D2 from the first diameter D1 is not particularly limited, but may be, for example, 0.06 mm or less, or 0.05 mm or less.
  • the boundary between the chamfer cutting edge 33 and the approach surface 8 is a first boundary 51.
  • the first boundary 51 is the front end of the approach surface 8 .
  • the first boundary portion 51 corresponds to the outermost peripheral end of the cutting blade 3.
  • the boundary between the approach surface 8 and the first outer peripheral margin surface 10 is a second boundary 52 .
  • the second boundary 52 is the rear end of the approach surface 8 and the front end of the first outer peripheral margin surface 10.
  • the boundary between the first outer peripheral margin surface 10 and the first side surface 11 is a third boundary 53 .
  • the third boundary 53 is the rear end of the first outer peripheral margin surface 10 .
  • the approach surface 8 is inclined with respect to the first outer peripheral margin surface 10 when viewed in the direction along the axis X.
  • the distance between the axis X and the second boundary portion 52 is greater than the distance between the axis X and the first boundary portion 51.
  • the inclination angle of the approach surface 8 with respect to the first outer peripheral margin surface 10 is a first angle ⁇ 1.
  • the first angle ⁇ 1 is the inclination angle of a straight line passing through the first boundary portion 51 and the second boundary portion 52 with respect to the tangent of the first outer peripheral margin surface 10 at the second boundary portion 52.
  • the first angle ⁇ 1 is, for example, 3° or more and 15° or less.
  • the lower limit of the first angle ⁇ 1 is not particularly limited, but may be, for example, 5° or more, or 7° or more.
  • the upper limit of the first angle ⁇ 1 is not particularly limited, but may be, for example, 12° or less, or 8° or less.
  • the first width W1 is the length of a line segment connecting the second boundary portion 52 and the third boundary portion 53.
  • the width of the approach surface 8 is a fourth width W4.
  • the fourth width W4 is the length of a line segment connecting the first boundary portion 51 and the second boundary portion 52.
  • the fourth width W4 is, for example, 0.1 mm or more and 0.4 mm or less.
  • the lower limit of the fourth width W4 is not particularly limited, but may be, for example, 0.15 mm or more, or 0.20 mm or more.
  • the upper limit of the fourth width W4 is not particularly limited, but may be, for example, 0.35 mm or less, or 0.30 mm or less.
  • FIG. 4 is a schematic perspective view showing the front end of the drill 100 according to the first embodiment.
  • the approach surface 8 is located between the first outer peripheral margin surface 10 and the helical groove surface 5.
  • the approach surface 8 is continuous with the outermost peripheral end of the cutting blade 3.
  • the approach surface 8 is formed along the leading edge 7 of the helical groove surface 5. From another point of view, the leading edge 7 is constituted by a ridgeline between the approach surface 8 and the helical groove surface 5.
  • the approach surface 8 extends from the first chamfer surface portion 41 toward the rear end 2 along the first outer peripheral margin surface 10 .
  • the length of the approach surface 8 in the direction parallel to the axis X is a third length L3.
  • the third length L3 is 0.5 times or more the first diameter D1.
  • the lower limit of the third length L3 is not particularly limited, but may be, for example, one or more times the first diameter D1, or two or more times the first diameter D1.
  • the upper limit of the third length L3 is not particularly limited, but may be, for example, 20 times or less or 10 times or less the first diameter D1.
  • FIG. 5 is an enlarged schematic diagram of region V in FIG. 1.
  • the front end of the second outer circumferential margin surface 20 is located axially rearward than the front end of the first outer circumferential margin surface 10.
  • the second outer peripheral margin surface 20 is located between the front end of the first outer peripheral margin surface 10 and the rear end 2 of the drill 100.
  • the distance between the front end of the first outer circumferential margin surface 10 and the front end of the second outer circumferential margin surface 20 is defined as a recess amount L1 of the second outer circumferential margin surface 20 with respect to the first outer circumferential margin surface 10.
  • the retraction amount L1 is, for example, 2% or more and 10% or less of the first diameter D1.
  • the lower limit of the retraction amount L1 is not particularly limited, but may be, for example, 3% or more of the first diameter D1, or 4% or more.
  • the upper limit of the retraction amount L1 is not particularly limited, but may be, for example, 9% or less of the first diameter D1 or 8% or less.
  • the length of the chamfer cutting edge portion 33 in the direction parallel to the axis X is a second length L2.
  • the second length L2 is, for example, 3% or more and 10% or less of the first diameter D1.
  • the lower limit of the second length L2 is not particularly limited, but may be, for example, 4% or more of the first diameter D1 or 5% or more of the first diameter D1.
  • the upper limit of the second length L2 is not particularly limited, but may be, for example, 9% or less of the first diameter D1 or 8% or less of the first diameter D1.
  • the thinning surface 6 is continuous with the twisted groove surface 5.
  • the thinning cutting edge portion 31 is continuous with the thinning surface 6.
  • the ridgeline between the thinning surface 6 and the first flank portion 43 constitutes the thinning cutting edge portion 31.
  • the helical groove surface 5 is continuous with each of the main cutting edge portion 32 and the chamfer cutting edge portion 33.
  • the ridgeline between the helical groove surface 5 and the first flank section 43 constitutes the main cutting edge section 32 .
  • the ridgeline between the twisted groove surface 5 and the first chamfer surface portion 41 constitutes a chamfer cutting edge portion 33 .
  • FIG. 6 is a schematic diagram showing a state in which the cutting blade 3 is rotationally projected onto a rotational projection plane including the axis X when the drill 100 is rotated around the axis X.
  • the rotational projection trajectory 130 of the cutting blade 3 includes a first projection trajectory 131, a second projection trajectory 132, and a third projection trajectory 133.
  • the first projection trajectory 131 is a trajectory obtained by projecting the thinning cutting edge portion 31 onto the rotational projection plane.
  • the second projection trajectory 132 is a trajectory obtained by projecting the main cutting edge portion 32 onto the rotational projection plane.
  • the third projection trajectory 133 is a trajectory obtained by projecting the chamfer cutting edge portion 33 onto the rotational projection plane.
  • the angle between the projected locus 134 of the axis X and the third projected locus 133 of the chamfer cutting edge 33 is a second angle ⁇ 2.
  • the second angle ⁇ 2 is, for example, 15° or more and 45° or less.
  • the lower limit of the second angle ⁇ 2 is not particularly limited, but may be, for example, 17° or more, or 19° or more.
  • the upper limit of the second angle ⁇ 2 is not particularly limited, but may be, for example, 43° or less, or 41° or less.
  • FIG. 7 is a schematic cross-sectional view taken along line VII-VII in FIG. 1.
  • the cross section shown in FIG. 7 is perpendicular to axis X. In the direction along the axis X, the distance between the cross section shown in FIG. 7 and the front end 1 of the drill 100 is the same as the first diameter D1.
  • the core thickness of the drill 100 is a third diameter D3.
  • the third diameter D3 is, for example, 28% or more and 40% or less of the first diameter D1.
  • the lower limit of the third diameter D3 is not particularly limited, but may be, for example, 30% or more of the first diameter D1, or 32% or more of the first diameter D1.
  • the upper limit of the third diameter D3 is not particularly limited, but may be, for example, 38% or less, or 36% or less.
  • the core thickness of the drill 100 is twice the shortest distance between the axis X and the helical groove surface 5 in a cross section perpendicular to the axis X.
  • the first central angle ⁇ 3 is formed by a line segment connecting the end of the helical groove surface 5 at the front in the rotational direction and the axis X, and a line segment connecting the end of the helical groove surface 5 at the rear in the rotational direction and the axis X. It's an angle.
  • the end of the helical groove surface 5 at the front in the rotational direction is the boundary between the second outer peripheral margin surface 20 and the helical groove surface 5 .
  • the end of the helical groove surface 5 at the rear in the rotational direction is the boundary between the approach surface 8 and the helical groove surface 5.
  • the second central angle ⁇ 4 is a value obtained by subtracting the first central angle ⁇ 3 from the value obtained by dividing 360° by N.
  • the second central angle ⁇ 4 is the value obtained by subtracting the first central angle ⁇ 3 from 180°.
  • the first central angle ⁇ 3 is, for example, 0.5 to 1 times the second central angle ⁇ 4.
  • the cross section perpendicular to the axis It may be twice or more. In the cross section perpendicular to the axis It may be twice or less.
  • one cutting edge 3 is provided with a margin part that forms the first outer peripheral margin surface 10 and a margin part that forms the second outer peripheral margin surface 20.
  • the drill 100 according to the first embodiment includes two cutting edges 3, two approach surfaces 8, four margins, two helical groove surfaces 5, and two flank surfaces 40. have. Viewed in a direction along axis X, the shape of drill 100 is substantially rotationally symmetrical with respect to axis X. If the number of cutting edges of the drill 100 is N, then the shape of the drill 100 is substantially N-fold symmetrical with respect to the axis X. When the number of cutting edges 3 of the drill 100 is two, the shape of the drill 100 is two-fold symmetrical with respect to the axis X.
  • the drill 100 according to the second embodiment differs from the drill 100 according to the first embodiment in that it has a third outer peripheral margin surface 60, and is substantially different from the drill 100 according to the first embodiment in other respects. are essentially the same.
  • differences from the drill 100 according to the first embodiment will be mainly described.
  • FIG. 8 is a schematic front view showing the configuration of a drill 100 according to the second embodiment.
  • the schematic front view shown in FIG. 8 corresponds to the schematic front view shown in FIG. 2.
  • the drill 100 according to the second embodiment has a third outer peripheral margin surface 60.
  • the third outer circumferential margin surface 60 is located between the first outer circumferential margin surface 10 and the second outer circumferential margin surface 20.
  • the third outer circumferential margin surface 60 is spaced apart from each of the first outer circumferential margin surface 10 and the second outer circumferential margin surface 20.
  • the width of the third outer peripheral margin surface 60 is a third width W3.
  • the third width W3 is, for example, 5% or more and 20% or less of the diameter of the first outer peripheral margin surface 10.
  • the third outer peripheral margin surface 60 has an arcuate shape.
  • the width of the third outer peripheral margin surface 60 is the length of a line segment connecting both ends of the arc-shaped third outer peripheral margin surface 60.
  • FIG. 9 is a schematic plan view showing the configuration of a drill 100 according to the second embodiment.
  • the schematic plan view shown in FIG. 9 corresponds to the schematic plan view shown in FIG. 5.
  • the outer peripheral surface 9 of the drill 100 according to the second embodiment has a third side surface 63 and a fourth side surface 64.
  • the third side surface 63 is continuous with the third outer peripheral margin surface 60.
  • the third side surface 63 is located forward of the third outer peripheral margin surface 60 in the rotational direction.
  • the fourth side surface 64 is continuous with the third outer peripheral margin surface 60.
  • the fourth side surface 64 is located at the rear of the third outer peripheral margin surface 60 in the rotational direction.
  • the outer peripheral intermediate surface 4 has a first intermediate region 61 and a second intermediate region 62.
  • the first intermediate region 61 is continuous with each of the first side surface 11 and the third side surface 63.
  • the first intermediate region 61 is located at the rear of the first side surface 11 in the rotational direction and at the front of the third side surface 63 in the rotational direction.
  • the second intermediate region 62 is continuous with each of the second side surface 12 and the fourth side surface 64.
  • the second intermediate region 62 is located at the rear of the fourth side surface 64 in the rotational direction and at the front of the second side surface 12 in the rotational direction.
  • one cutting edge 3 has a margin part forming the first outer peripheral margin surface 10, a margin part forming the second outer peripheral margin surface 20, and a third outer peripheral margin surface 60.
  • a margin portion is provided.
  • the drill 100 according to the second embodiment includes two cutting edges 3, two approach surfaces 8, six margins, two helical groove surfaces 5, and two flank surfaces 40. have.
  • the work material is, for example, a metal such as stainless steel (SUS).
  • the work material may be carbon steel, alloy steel, or a difficult-to-cut material.
  • the first outer peripheral margin surface 10 is located rearward in the rotational direction than the outermost peripheral end of the cutting blade 3 and has a diameter larger than the diameter of the cutting blade 3. .
  • the drill 100 according to the present embodiment has the approach surface 8 that is inclined with respect to the first outer peripheral margin surface 10 when viewed in the direction along the axis X.
  • the approach surface 8 is located between the first outer peripheral margin surface 10 and the helical groove surface 5 , continues to the outermost peripheral end, and is formed along the leading edge 7 of the helical groove surface 5 .
  • the diameter changes more gently from the leading edge 7 to the first outer peripheral margin surface 10 than in the case where the approach surface 8 is not provided. Therefore, it is possible to suppress welding of the cut material to the outer peripheral margin surface due to frictional heat generated by the burnishing.
  • the length of the approach surface 8 in the direction parallel to the axis X is 0.5 times or more the diameter of the first outer peripheral margin surface 10. Thereby, even if the cutting edge 3 is reground, the approach surface 8 can remain. Therefore, the life of the drill 100 can be extended.
  • the value obtained by subtracting the diameter of the cutting edge 3 from the diameter of the first outer peripheral margin surface 10 may be 0.01 mm or more and 0.08 mm or less.
  • the value obtained by subtracting the diameter of the cutting edge 3 from the diameter of the first outer peripheral margin surface 10 may be 0.01 mm or more and 0.08 mm or less.
  • the width of the approach surface 8 when viewed in the direction along the axis X may be 0.1 mm or more and 0.4 mm or less.
  • the width of the approach surface 8 By setting the width of the approach surface 8 to 0.1 mm or more, welding of chips can be further suppressed.
  • the outer peripheral margin surface By setting the width of the approach surface 8 to 0.4 mm or less, the outer peripheral margin surface can be provided at a position close to the cutting edge 3. Thereby, deterioration of the accuracy of the hole diameter can be suppressed.
  • the inclination angle of the approach surface 8 with respect to the first outer peripheral margin surface 10 may be 3° or more and 15° or less when viewed in the direction along the axis X.
  • the difference between the diameter of the first outer circumferential margin surface 10 and the diameter of the cutting edge 3 can be increased.
  • the inclination angle of the approach surface 8 with respect to the first outer circumferential margin surface 10 is 15 degrees or less, the angle of the approach surface 8 with respect to the first outer circumferential margin surface 10 becomes excessively large, thereby causing welding of the workpiece material. can be suppressed.
  • the core thickness of the drill 100 may be 28% or more and 40% or less of the diameter of the cutting edge 3.
  • the central angle of the twisted groove surface 5 may be 0.5 times or more and 1 time or less of the central angle of the portion other than the twisted groove surface 5.
  • the drill 100 when viewed in the direction along the axis It may be 5% or more and 20% or less.
  • the width of each of the first outer circumferential margin surface 10 and the second outer circumferential margin surface 20 By setting the width of each of the first outer circumferential margin surface 10 and the second outer circumferential margin surface 20 to 5% or more of the diameter of the first outer circumferential margin surface 10, the vanishing effect can be enhanced.
  • the width of each of the first outer circumferential margin surface 10 and the second outer circumferential margin surface 20 By setting the width of each of the first outer circumferential margin surface 10 and the second outer circumferential margin surface 20 to 20% or less, it is possible to suppress wear of the drill 100 due to excessive burnishing.
  • the second outer peripheral margin surface 20 is located between the front end of the first outer peripheral margin surface 10 and the rear end 2 of the drill 100 in the direction parallel to the axis X. It's okay.
  • the amount of retraction of the second outer circumferential margin surface 20 with respect to the first outer circumferential margin surface 10 may be 2% or more and 10% or less of the diameter of the first outer circumferential margin surface 10.
  • the cutting edge 3 has the main cutting edge portion 32 continuous to the first flank surface portion 43 and the chamfer cutting edge portion 33 continuous to the first chamfer surface portion 41. It's okay. Thereby, burrs formed in the holes can be removed. Therefore, finishing reaming is not necessary.
  • the coolant supply hole 30 may be provided in the flank surface 40. Therefore, even if the drill 100 becomes high in temperature due to burnishing, the drill 100 can be cooled by supplying coolant from the coolant supply hole 30. As a result, the roughness of the hole surface can be further reduced.
  • sample preparation First, drills 100 of samples 1 and 2 were prepared.
  • the drill 100 of Sample 1 is a comparative example.
  • the sample 2 drill 100 is an example.
  • the drill 100 of Sample 2 has an approach surface 8 .
  • the inclination angle (first angle ⁇ 1) of the approach surface 8 with respect to the first outer peripheral margin surface 10 was set to 7°.
  • the width of the approach surface 8 (fourth width W4) was set to 0.3 mm.
  • the drill 100 of sample 1 does not have an approach surface 8.
  • the first diameter D1 of the drill 100 of Sample 1 was 7.993 mm.
  • the first diameter D1 of the drill 100 of Sample 2 was 8.003 mm.
  • FIG. 10 shows the diameter of a hole formed using the drill 100 according to Sample 1.
  • FIG. 11 shows the diameter of a hole formed using the drill 100 according to Sample 2.
  • Table 1 shows the diameters of holes formed using the drills 100 according to Samples 1 and 2.
  • the position indicated by the broken line corresponds to the first diameter D1 of the drill 100.
  • the hole diameter enlargement when forming a hole using the drill 100 according to sample 2 is the same as when using the drill 100 according to sample 1. This was smaller than the amount of expansion of the hole diameter when the hole was formed. From the above results, it was demonstrated that the drill 100 of the example can reduce the amount of expansion of the hole diameter compared to the drill 100 of the comparative example.
  • the thrust component of the cutting resistance was evaluated using the drills 100 of Samples 1 and 2.
  • the workpiece material was S50C.
  • the depth of the hole was 24 mm.
  • Hole formation was performed using four different cutting conditions.
  • the cutting speed Vc was 80 m/min or 120 m/min.
  • the feed amount f was 0.15 mm/rotation or 0.25 mm/rotation.
  • the thrust component of cutting resistance was measured while forming a hole in a workpiece.
  • Table 2 shows the thrust component of the cutting resistance of the drill 100 according to Samples 1 and 2. As shown in Table 2, when compared under the same cutting conditions, the thrust component of the cutting resistance of the drill 100 according to sample 2 is approximately the same as the thrust component of the cutting resistance of the drill 100 according to sample 1. was confirmed.
  • Table 3 shows the surface Ra of holes formed using the drill 100 according to Samples 1 and 2. As shown in Table 3, when compared under the same cutting conditions, the Ra of the surface of the hole formed using the drill 100 according to Sample 2 is the same as that of the surface of the hole formed using the drill 100 according to Sample 1. It was smaller than Ra. The above results demonstrate that the drill 100 of the example can reduce the roughness of the hole surface compared to the drill 100 of the comparative example.
  • Table 4 shows Ra and Rz of the surface of the hole formed after the cutting length of 23.6 m. As shown in Table 4, Ra and Rz of the surface of the hole formed using the drill 100 according to Sample 2 are smaller than Ra and Rz of the surface of the hole formed using the drill 100 according to Sample 1. Ta. From the above results, it was demonstrated that the drill 100 of the example can reduce the roughness of the hole surface compared to the drill 100 of the comparative example even after the cutting length of 23.6 m has elapsed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)

Abstract

Le foret de l'invention possède une arête coupante, une face de goujure hélicoïdale, une première face de listel périphérique externe, et une face d'approche. La face de goujure hélicoïdale est liée à l'arête coupante. La première face de listel périphérique externe est positionnée en arrière dans une direction de rotation par rapport à l'extrémité périphérique la plus externe de l'arête coupante, et possède un diamètre supérieur au diamètre de l'arête coupante. La face d'approche est positionnée entre la première face de listel périphérique externe et la face de goujure hélicoïdale, est liée à l'extrémité périphérique la plus externe, et est formée suivant un bord d'attaque de la face de goujure hélicoïdale. Dans une vue dans une direction suivant une ligne axiale, la face d'approche est inclinée par rapport à la première face de listel périphérique externe. La longueur de la face d'approche dans une direction parallèle à la ligne axiale, est supérieure ou égale à 0,5 fois le diamètre de la première face de listel périphérique externe.
PCT/JP2022/023991 2022-06-15 2022-06-15 Foret WO2023243005A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63237807A (ja) * 1987-03-25 1988-10-04 Mitsubishi Metal Corp ドリル
JPH0615512A (ja) * 1992-07-03 1994-01-25 Toshiaki Hosoi ドリルおよびドリルの切刃形成方法
JP2003136317A (ja) * 2001-10-25 2003-05-14 Osg Corp ドリル
JP2018114589A (ja) * 2017-01-18 2018-07-26 三菱日立ツール株式会社 ドリル
JP2021053783A (ja) * 2019-10-01 2021-04-08 三菱マテリアル株式会社 ドリル

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63237807A (ja) * 1987-03-25 1988-10-04 Mitsubishi Metal Corp ドリル
JPH0615512A (ja) * 1992-07-03 1994-01-25 Toshiaki Hosoi ドリルおよびドリルの切刃形成方法
JP2003136317A (ja) * 2001-10-25 2003-05-14 Osg Corp ドリル
JP2018114589A (ja) * 2017-01-18 2018-07-26 三菱日立ツール株式会社 ドリル
JP2021053783A (ja) * 2019-10-01 2021-04-08 三菱マテリアル株式会社 ドリル

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