WO2012017645A1 - ドリル - Google Patents

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Publication number
WO2012017645A1
WO2012017645A1 PCT/JP2011/004386 JP2011004386W WO2012017645A1 WO 2012017645 A1 WO2012017645 A1 WO 2012017645A1 JP 2011004386 W JP2011004386 W JP 2011004386W WO 2012017645 A1 WO2012017645 A1 WO 2012017645A1
Authority
WO
WIPO (PCT)
Prior art keywords
drill
cutting edge
outer peripheral
cutting
cutting blade
Prior art date
Application number
PCT/JP2011/004386
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
昌尚 岩田
良太 長江
秀城 福岡
Original Assignee
株式会社イワタツール
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 株式会社イワタツール filed Critical 株式会社イワタツール
Publication of WO2012017645A1 publication Critical patent/WO2012017645A1/ja

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/02—Twist drills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/04—Angles, e.g. cutting angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/14—Configuration of the cutting part, i.e. the main cutting edges

Definitions

  • the present invention relates to a drill suitable for high-speed machining of holes.
  • Patent Document 1 discloses a twist drill in which the corner cutting edge is formed on the outer periphery of the cutting edge and the strength of the outer peripheral end portion is improved to improve the strength of the cutting edge.
  • the corner cutting edge is made large in order to improve the strength of the cutting edge, the chips are discharged toward the outer circumference, so that the chips hit the wall surface of the hole and generate heat or are not easily discharged to the outside.
  • a large resistance is applied to the drill, cutting performance is degraded, the drill is broken, and the life of the drill is shortened. For this reason, there is a problem that the feed amount of the drill cannot be increased and the sufficiently high-speed drilling cannot be performed.
  • the present invention realizes a long-life drill capable of high-speed machining by improving the cutting edge strength and controlling the chip discharge direction to the upward direction of the hole so that it is efficiently discharged. Objective.
  • a chip discharge groove is formed on the outer peripheral portion of the drill, and the relief formed on the rake face of the inner peripheral surface of the chip discharge groove and the tip of the drill.
  • the cutting edge is formed to recede toward the rear in the rotation direction of the drill toward the outer circumferential direction, and the cutting when the drill tip is viewed from the front.
  • the rake angle ⁇ in the radial direction at the outer peripheral edge of the blade is ⁇ 50 ° ⁇ ⁇ ⁇ 15 °
  • the tip angle of the cutting blade is the largest at the center
  • the width W from the outer peripheral edge of the cutting blade is The technical means that the tip angle ⁇ is formed to satisfy 50 ° ⁇ ⁇ ⁇ 110 ° in a region satisfying 0.2D ⁇ W ⁇ 0.4D (D: diameter of the drill) is used.
  • the cutting edge is formed by retreating toward the rear in the rotation direction of the drill toward the outer circumferential direction, and at the outer peripheral end of the cutting edge when the front end of the drill is viewed from the front.
  • the tip angle of the cutting edge is maximum at the center, and the tip angle ⁇ is in a region where the width W from the outer peripheral end of the cutting edge satisfies 0.2D ⁇ W ⁇ 0.4D (D: diameter of the drill).
  • D diameter of the drill
  • the chamfer portion is chamfered at the outer peripheral end portion of the cutting blade, and the width L of the chamfer portion is 0.05D ⁇ L ⁇ 0.
  • the chip discharge direction can be controlled in the hole upward direction so as to be efficiently discharged, so that the width is wider than the conventional drill as in the invention of claim 2.
  • a chamfer part can be provided.
  • the cutting blade has a plurality of linear shapes in which the tip angle and the rake angle in the radial direction become smaller toward the outer peripheral direction of the drill.
  • the technical means of being constituted by a cutting blade is used.
  • the cutting blade when the cutting blade is constituted by a plurality of linear cutting blades, it is possible to facilitate re-polishing of the cutting blade after manufacturing and use of the drill.
  • a drill 1 that rotates around an axis and drills a hole includes a pair of chip discharge grooves 11 formed in a spiral shape in the axial direction of the outer peripheral portion, a rake face 11 a of the chip discharge groove 11, and a drill A cutting edge 14 having a predetermined tip angle is formed at the ridge line portion by the flank formed in the tip (in this embodiment, the first flank 12 and the second flank 13).
  • a chisel edge 15 is formed at the center of the tip of the drill 1 by intersecting the first flank 12. Further, a thinning portion 16 is formed on the inner peripheral side of the tip portion of the cutting blade 14 by cutting out the inner wall surface of the rake face 11a.
  • a margin portion 17 and a second picking surface 18 having an outer diameter smaller than that of the margin portion 17 are formed.
  • the cutting edge 14 is formed to recede toward the rear in the rotation direction of the drill so that the rake angle in the radial direction becomes smaller toward the outer periphery of the drill.
  • the cutting blade 14 is formed by connecting a plurality of cutting blades formed in a straight line, and the first cutting blade formed by the first flank 12 and the rake face 11a from the center side. 14a, a second cutting edge 14b formed by the second flank 13 and the rake face 11a is provided.
  • the cutting blade 14 by constituting the cutting blade 14 with a plurality of linear cutting blades, re-polishing of the cutting blade after the manufacture and use of the drill can be facilitated.
  • a chamfer portion 19 chamfered toward the rear in the rotation direction of the drill is formed at the outer peripheral end portion of the cutting blade 14.
  • the chamfer portion 19 is formed so that the rake angle ⁇ in the radial direction satisfies ⁇ 50 ° ⁇ ⁇ ⁇ 15 °.
  • the width L of the chamfer portion is formed such that 0.05D ⁇ L ⁇ 0.3D with respect to the diameter D of the drill.
  • the cutting edge 14 is formed such that the rake angle ⁇ in the radial direction at the outer peripheral end portion satisfies the above condition.
  • the cutting edge 14 is formed so that the tip angle becomes smaller toward the outer peripheral direction of the drill.
  • the tip angle ⁇ of the first cutting edge 14a is formed to be 118 ° to 150 °.
  • the cutting edge 14 has a tip angle ⁇ of 50 ° ⁇ ⁇ ⁇ 110 ° in a region where the width W from the outer peripheral edge of the cutting blade satisfies 0.2D ⁇ W ⁇ 0.4D (D: diameter of the drill). It is comprised so that.
  • the 2nd cutting blade 14b and the chamfer part 19 (area
  • the cutting edge 14 is formed so as to recede toward the rear in the rotation direction of the drill toward the outer peripheral direction, thereby increasing the contact length between the work material and the cutting edge 14 and per unit length of the cutting edge.
  • the load can be reduced. If the rake angle ⁇ is too large, the effect of preventing the outer peripheral edge from being lost is reduced. If the rake angle ⁇ is too small, the cutting resistance increases, so ⁇ 50 ° ⁇ ⁇ ⁇ 15 °, preferably ⁇ 40 °. It is preferable to configure so that ⁇ ⁇ ⁇ ⁇ 20 °.
  • the chamfer portion 19 having a width L wider than that of the conventional drill can be obtained because the chip can be discharged efficiently by controlling the chip discharge direction to the upward direction of the hole as described later. Can be provided. Thereby, the intensity
  • the region where the rake angle in the radial direction has a negative value corresponds to the first cutting edge 14a, the second cutting edge 14b, and the chamfer portion 19.
  • chips are discharged toward the outer peripheral direction, but the width W from the outer peripheral end of the cutting blade is 0.2D ⁇ W ⁇ 0.4D (D: drill
  • the tip angle ⁇ is 50 ° ⁇ ⁇ ⁇ 110 °, preferably 60 ° ⁇ ⁇ ⁇ 100 ° in a region satisfying It can be efficiently discharged.
  • the tip angle ⁇ when the tip angle ⁇ is less than 50 °, chips are easily discharged in the central direction, and the cutting edge becomes longer, so that the cutting resistance increases. Moreover, even if the tip angle ⁇ exceeds 100 °, the action of discharging chips to the upper surface of the hole surface becomes small.
  • the configuration in which the cutting blade 14 includes the first cutting blade 14a and the second cutting blade 14b and the chamfer portion 19 is illustrated is exemplified, but the configuration is not limited thereto.
  • the cutting edge 14 may be constituted by three or more linear cutting edges such that the tip angle ⁇ and the rake angle ⁇ in the radial direction become smaller toward the outer peripheral direction of the drill 1.
  • the cutting edge 14 can be formed by a circular arc or a smooth curve convex in the rotation direction. According to this, since the cutting edge 14 has no corners, the stress concentration is small and the length of the cutting edge 14 is increased, so that the strength of the cutting edge 14 can be improved.
  • the chamfer part 19 may not be formed. It can also be formed in a curved shape in which the tip angle ⁇ continuously decreases. In this case, the outer side corresponds to the region having the width W from the point where the tip angle ⁇ is 110 ° or less.
  • Example 1 Hole drilling was performed using a drill according to an example of the present invention and a conventional drill, and the life of each drill was evaluated.
  • the drill of the example is the same as the drill 1 in the above embodiment, the diameter D is 1 mm, the rake angle ⁇ is ⁇ 38 °, the tip angle ⁇ of the first cutting edge 14a is 140 °, and the tip angle ⁇ of the second cutting edge 14b.
  • the chamfer portion 19 had a width L of 0.13 mm (0.13D).
  • a twist drill having a straight edge with no chamfer portion formed and having a tip angle of 120 ° was used as a drill of the comparative example.
  • Example 1 shows the processing conditions and life. As high-speed machining conditions, the feed amount was set to 0.1 mm / rev, which is twice the 0.05 mm / rev adopted as general machining conditions. Example 1 and Comparative Example 1 are the same processing conditions, and Example 2 is a condition in which the number of rotations is increased.
  • the drill of the present invention has a longer life than conventional drills under high-speed machining conditions.
  • the cutting edge 14 is formed so as to recede toward the rear in the rotation direction of the drill 1 in the outer peripheral direction, and the rake angle ⁇ in the radial direction at the outer peripheral end of the cutting edge 14 is ⁇
  • the contact length between the work material and the cutting blade 14 is lengthened to reduce the load per unit length of the cutting blade 14, and the cutting blade
  • the strength of the outer peripheral end portion of 14 can be improved.
  • the tip angle ⁇ is 50 ° ⁇ ⁇ ⁇ 110 ° in a region where the width W from the outer peripheral end portion of the cutting edge satisfies 0.2D ⁇ W ⁇ 0.4D (D: diameter of the drill).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)
PCT/JP2011/004386 2010-08-06 2011-08-03 ドリル WO2012017645A1 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010176946A JP5800477B2 (ja) 2010-08-06 2010-08-06 ドリル
JP2010-176946 2010-08-06

Publications (1)

Publication Number Publication Date
WO2012017645A1 true WO2012017645A1 (ja) 2012-02-09

Family

ID=45559166

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2011/004386 WO2012017645A1 (ja) 2010-08-06 2011-08-03 ドリル

Country Status (2)

Country Link
JP (1) JP5800477B2 (enrdf_load_stackoverflow)
WO (1) WO2012017645A1 (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107530792A (zh) * 2015-05-08 2018-01-02 特固克有限会社 切割工具
WO2019233509A1 (de) * 2018-06-08 2019-12-12 Zcc Cutting Tools Europe Gmbh Bohrwerkzeug
US11278970B2 (en) 2018-10-09 2022-03-22 Milwaukee Electric Tool Corporation Drill bit
US11407039B2 (en) * 2018-01-29 2022-08-09 Milwaukee Electric Tool Corporation Drill bit
JP2023068305A (ja) * 2021-11-02 2023-05-17 三菱マテリアル株式会社 ドリル
EP4414110A1 (en) * 2023-02-13 2024-08-14 AB Sandvik Coromant Drill

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6236851B2 (ja) * 2013-04-19 2017-11-29 株式会社不二越 ドリル
JP6294095B2 (ja) * 2014-02-21 2018-03-14 京セラ株式会社 ドリルおよびそれを用いた切削加工物の製造方法
JP7375329B2 (ja) 2019-04-17 2023-11-08 三菱マテリアル株式会社 ドリル
CN116209533A (zh) * 2020-07-27 2023-06-02 三菱综合材料株式会社 钻头
JP2022023828A (ja) * 2020-07-27 2022-02-08 三菱マテリアル株式会社 ドリル
WO2024176439A1 (ja) * 2023-02-24 2024-08-29 三菱マテリアル株式会社 ドリル

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59166405A (ja) * 1983-03-07 1984-09-19 Daijietsuto Kogyo Kk ドリル
GB2184046A (en) * 1985-12-13 1987-06-17 Skf & Dormer Tools Twist drill
JPH0780714A (ja) * 1993-09-14 1995-03-28 Kobe Steel Ltd 超硬質ドリル
JPH0871824A (ja) * 1994-09-12 1996-03-19 O S G Kk 複合材料加工用ドリル
JP2000198011A (ja) * 1998-10-27 2000-07-18 Nachi Fujikoshi Corp ツイストドリル
JP2003205412A (ja) * 2002-01-15 2003-07-22 Nachi Fujikoshi Corp 三溝ドリル
JP2005153023A (ja) * 2002-09-05 2005-06-16 Hitachi Tool Engineering Ltd 深穴加工用ドリル

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02198707A (ja) * 1989-01-24 1990-08-07 Masao Kubota ドリル
KR20030084082A (ko) * 2002-04-24 2003-11-01 고성림 버형성을 최소화하기 위한 스텝 드릴
US7575401B1 (en) * 2004-11-18 2009-08-18 Precorp, Inc. PCD drill for composite materials

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59166405A (ja) * 1983-03-07 1984-09-19 Daijietsuto Kogyo Kk ドリル
GB2184046A (en) * 1985-12-13 1987-06-17 Skf & Dormer Tools Twist drill
JPH0780714A (ja) * 1993-09-14 1995-03-28 Kobe Steel Ltd 超硬質ドリル
JPH0871824A (ja) * 1994-09-12 1996-03-19 O S G Kk 複合材料加工用ドリル
JP2000198011A (ja) * 1998-10-27 2000-07-18 Nachi Fujikoshi Corp ツイストドリル
JP2003205412A (ja) * 2002-01-15 2003-07-22 Nachi Fujikoshi Corp 三溝ドリル
JP2005153023A (ja) * 2002-09-05 2005-06-16 Hitachi Tool Engineering Ltd 深穴加工用ドリル

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107530792A (zh) * 2015-05-08 2018-01-02 特固克有限会社 切割工具
US11407039B2 (en) * 2018-01-29 2022-08-09 Milwaukee Electric Tool Corporation Drill bit
US12296395B2 (en) 2018-01-29 2025-05-13 Milwaukee Electric Tool Corporation Drill bit
WO2019233509A1 (de) * 2018-06-08 2019-12-12 Zcc Cutting Tools Europe Gmbh Bohrwerkzeug
US11278970B2 (en) 2018-10-09 2022-03-22 Milwaukee Electric Tool Corporation Drill bit
JP2023068305A (ja) * 2021-11-02 2023-05-17 三菱マテリアル株式会社 ドリル
JP7663064B2 (ja) 2021-11-02 2025-04-16 三菱マテリアル株式会社 ドリル
EP4414110A1 (en) * 2023-02-13 2024-08-14 AB Sandvik Coromant Drill
WO2024170402A1 (en) * 2023-02-13 2024-08-22 Ab Sandvik Coromant Drill

Also Published As

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JP2012035359A (ja) 2012-02-23

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