WO2015194408A1 - Foret - Google Patents

Foret Download PDF

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Publication number
WO2015194408A1
WO2015194408A1 PCT/JP2015/066435 JP2015066435W WO2015194408A1 WO 2015194408 A1 WO2015194408 A1 WO 2015194408A1 JP 2015066435 W JP2015066435 W JP 2015066435W WO 2015194408 A1 WO2015194408 A1 WO 2015194408A1
Authority
WO
WIPO (PCT)
Prior art keywords
cutting edge
drill
outer end
thinning
width
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2015/066435
Other languages
English (en)
Japanese (ja)
Inventor
和昌 栗塚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Electric Hardmetal Corp
Original Assignee
Sumitomo Electric Hardmetal Corp
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 Sumitomo Electric Hardmetal Corp filed Critical Sumitomo Electric Hardmetal Corp
Priority to DE112015002883.8T priority Critical patent/DE112015002883T5/de
Priority to CN201580001605.5A priority patent/CN105473262B/zh
Publication of WO2015194408A1 publication Critical patent/WO2015194408A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B23B2251/08—Side or plan views of cutting edges
    • B23B2251/087—Cutting edges with a wave form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/12—Cross sectional views of the cutting edges
    • B23B2251/122—Bevelled cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/12—Cross sectional views of the cutting edges
    • B23B2251/125—Rounded cutting edges
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/18—Configuration of the drill point

Definitions

  • This invention relates to a drill in which the cutting edge is reinforced, and more particularly to a drill in which the cutting load is reduced while maintaining the strength of the cutting edge.
  • the strengthening process of the cutting edge of a scissors drill is usually performed by a method of blunting the cutting edge.
  • the blunting of the cutting edge is performed by a method as shown in Patent Documents 1 and 2 below, for example.
  • the drill of patent document 1 forms the negative land which blunts a blade edge on a rake face, and makes the width of the negative land attached to the thinning part cutting edge in the front view of the drill larger than the width of the negative land attached to the main cutting edge. .
  • the drill of patent document 2 gives the honing process which rounds a blade edge to a blade edge part.
  • the honing width of the thinning part cutting edge is made constant over the entire length of the thinning part cutting edge, and the honing width of the outer peripheral part cutting edge connected to the radial outer end of the thinning part cutting blade is cut at the radial outer end. Widened to more than 1.5 times the honing width of the blade.
  • the width of the negative land or the honing is made constant for the thinned portion cutting edge, the width is made constant for the outer peripheral portion cutting edge, or the width from the rotation center side to the outer peripheral side is changed. Processing to increase the width was adopted.
  • the cutting edge is unnecessarily blunted to a portion where it is difficult to apply a cutting load, which increases the cutting load.
  • the present invention has an object to reduce the cutting load while maintaining the strength of the cutting edge of the drill with the drill subjected to the strengthening process (blunting process) applied to the cutting edge as the object of improvement.
  • a drill having a honing surface or a negative land formed in the entire region of the cutting edge, and the width of the honing surface or the negative land in the drill axis direction when viewed perpendicularly to the drill axis is the center of rotation.
  • the honing surface for reinforcing the cutting edge and the negative land are configured as described above, and the cutting load is reduced as compared with the conventional drill subjected to the cutting edge strengthening treatment.
  • FIG. 2 is an enlarged view of a part of a side surface of the drill, which is a view perpendicular to the drill axis of the drill of FIG. 1. It is a figure which expands and shows the front of the drill of FIG.
  • FIG. 4 is an enlarged cross-sectional view of a position along line XX in FIG. 3. It is an expanded sectional view showing other examples of blade edge processing of a drill of this invention. It is the figure which compared the measured value of the axial direction cutting load in a performance evaluation test.
  • the illustrated drill 1 is a twist drill having a twisted groove 3 on the outer periphery of a main body 2.
  • the groove surface at the tip of the twisted groove 3 is a rake surface 4, and the groove surface of the thinning portion 7 formed at the ridge line at the position where the rake surface 4 intersects the flank 5 at the tip and the center of the tip of the main body 2.
  • a cutting edge 6 is formed by a ridgeline at a position where the flank 5 intersects.
  • the scissors drill has a margin 8 and a shank 9 connected to the rear of the main body 2.
  • the scissors cutting blade 6 includes a thinning portion cutting edge 6a along the thinning portion and an outer peripheral portion cutting blade 6b connected to the radially outer end of the thinning portion cutting edge 6a.
  • the illustrated outer peripheral cutting edge 6b includes a concave arc cutting edge 6b- 1 connected to the outer end of the thinning cutting edge 6a, and a convex arc cutting extending from the outer end of the concave arc cutting edge 6b- 1 to the outermost periphery.
  • the blade portion 6b- 2 is combined.
  • the blade cutting edge 6 is subjected to a cutting edge strengthening process over the entire area.
  • the edge is rounded by a honing process.
  • FIG. 3 is a honing surface formed by the edge-strengthening process.
  • the width w in the drill axis direction when viewed perpendicularly to the drill axis gradually increases from the center of rotation toward the outer end of the thinning portion cutting edge 6 a.
  • the drill axis direction width w as viewed perpendicularly to the drill axis gradually decreases.
  • the width in the drill axis direction when viewed perpendicular to the drill axis gradually increases again from Mp toward the outer end of the cutting edge 6 (the radial outer end of the convex arc cutting edge portion 6b- 2 ).
  • the appropriate width w of the honing surface 10 in the drill axis direction when viewed perpendicularly to the drill axis is 0.02 mm to 0.06 mm.
  • the radius of curvature of the concave arc cutting edge portion 6b- 1 is set appropriately, for example, 0.5D (D is a drill diameter) or more, the concave arc cutting edge portion 6b- 1 is intermediate between the concave arc cutting edge portion 6b- 1 .
  • the concentration of the cutting load applied to the point Mp hardly occurs, and the cutting load applied to the intermediate point Mp is smaller than the cutting load applied to the outer end of the thinning portion cutting edge 6a.
  • the degree of strengthening of the cutting edge near the intermediate point Mp of the concave arc cutting edge portion 6b- 1 (which is determined by the drill axis direction width w of the honing surface 10 when viewed perpendicularly to the drill axis) is determined by the thinning portion cutting edge 6a. It is possible to reduce the cutting load by suppressing the blunting more than necessary to the region where the cutting load is difficult to be applied.
  • the honing surface 10 can be replaced with a negative land 11 as shown in FIG. Even with a structure in which the negative land 11 is provided on the rake face by polishing or grinding, the cutting edge can be strengthened.
  • This form also increases the width w in the drill axis direction in the negative view of the drill axis of the negative land gradually from the rotation center toward the outer end of the thinning portion cutting edge, and then the concave arc cutting edge portion from the outer end of the thinning portion cutting edge.
  • the outer peripheral cutting edge 6b of the illustrated drill has a convex arc cutting edge 6b- 2 on the outer end side.
  • the outer peripheral cutting edge 6b has a concave arc cutting as shown in FIG. 2 of the above-mentioned patent document 2 from the inner end connected to the outer end of the thinning cutting edge 6a to the outer end extending to the outer periphery of the drill. You may be comprised with the blade.
  • Sample 1 a honing surface for reinforcing the cutting edge was formed over the entire area of the cutting edge.
  • the width in the drill axis direction when viewed perpendicularly to the drill axis is gradually increased from the inner end to the outer end of the thinning portion cutting edge, and then the concave arc cutting edge portion of the thinning portion cutting edge is increased. It gradually decreased toward the intermediate point, and further increased gradually from the intermediate point of the concave arc cutting edge part toward the outermost end of the cutting edge.
  • the drill axial width of the honing surface at the inner end of the thinning part cutting edge in a perpendicular view of the drill axis is 0.02 mm
  • the drilling axial width of the honing surface at the outer end of the thinning part cutting edge is 0.05 mm
  • a concave arc The drill axial width of the honing surface at the midpoint of the cutting edge is 0.02 mm
  • the drill axial width of the honing surface at the outermost end of the cutting edge is 0.06 mm.
  • Example 2 For comparison, a carbide twist drill (sample 2 and sample 3) having the same diameter and the same blade shape was also prototyped.
  • Sample 2 the width in the drill axis direction of the honing surface as viewed from the right angle of the drill axis was uniformly 0.06 mm over the entire cutting edge.
  • Sample 3 has a honing surface with a drill axis width of 0.02 mm at the rotation center in a right angle view of the drill axis and a honing surface with a drill axis width of 0.06 mm at the outermost edge of the cutting edge.
  • the axial width was gradually increased from the center of rotation to the outermost edge of the cutting edge.
  • the cutting load is measured by a method of measuring the axial load applied to the measuring tool by placing the work material on the measuring tool (cutting dynamometer made by Nihon Kissler) and cutting the work material from above. It was.
  • the cutting load of sample 1 is about 300 kgf ⁇ cm less than that of sample 2.
  • the fluctuation width of the cutting load is about 300 Kgf ⁇ cm in the sample 2, while the sample 1 is as small as 200 Kgf ⁇ cm.
  • Sample 3 has a peak cutting load peak value of about 1500 Kgf ⁇ cm at the beginning of cutting, whereas Sample 1 is stable with an upper limit of cutting load from the beginning of cutting to the end of machining of about 1200 Kgf ⁇ cm. Therefore, the fluctuation width of the cutting load during processing is also smaller than that of the sample 3.

Landscapes

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

Abstract

L'invention concerne un foret qui a une section d'amincissement formée au niveau du centre de rotation, et un bord de coupe comportant un bord de coupe de section d'amincissement formé dans la section d'amincissement et une section de bord de coupe en arc concave qui s'étend depuis l'extrémité extérieure du bord de coupe de section d'amincissement ; et dans lequel une surface de rodage ou plateau négatif est formée sur l'intégralité du bord de coupe. La largeur de la surface de rodage ou plateau négatif dans la direction de l'axe du foret lorsque vue dans le sens perpendiculaire par rapport à l'axe du foret augmente progressivement depuis le centre de rotation jusqu'à l'extrémité extérieure du bord de coupe de section d'amincissement, diminue progressivement depuis l'extrémité extérieure du bord de coupe de section d'amincissement jusqu'à un point médian de la section de bord de coupe en arc concave, et augmente progressivement depuis le point médian jusqu'à l'extrémité extérieure du bord de coupe.
PCT/JP2015/066435 2014-06-17 2015-06-08 Foret Ceased WO2015194408A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE112015002883.8T DE112015002883T5 (de) 2014-06-17 2015-06-08 Bohrer
CN201580001605.5A CN105473262B (zh) 2014-06-17 2015-06-08 钻头

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-124053 2014-06-17
JP2014124053A JP6288585B2 (ja) 2014-06-17 2014-06-17 ドリル

Publications (1)

Publication Number Publication Date
WO2015194408A1 true WO2015194408A1 (fr) 2015-12-23

Family

ID=54935395

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/066435 Ceased WO2015194408A1 (fr) 2014-06-17 2015-06-08 Foret

Country Status (4)

Country Link
JP (1) JP6288585B2 (fr)
CN (1) CN105473262B (fr)
DE (1) DE112015002883T5 (fr)
WO (1) WO2015194408A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019021785A1 (fr) * 2017-07-27 2019-01-31 住友電工ハードメタル株式会社 Foret
JP6750790B1 (ja) * 2019-10-15 2020-09-02 住友電工ハードメタル株式会社 ドリル
EP3733334A4 (fr) * 2017-12-26 2021-09-22 Moldino Tool Engineering, Ltd. Foret
US11407040B2 (en) * 2018-05-21 2022-08-09 Osg Corporation Drill
US20230278113A1 (en) * 2020-07-23 2023-09-07 Milwaukee Electric Tool Corporation Step drill bit

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107971542A (zh) * 2017-12-27 2018-05-01 苏州阿诺精密切削技术有限公司 用于加工腰形孔的阶梯钻铣刀
DE112019004552B4 (de) 2018-09-12 2024-11-28 Kyocera Corporation Schneideinsatz, rotationswerkzeug und verfahren zur herstellung eines maschinell bearbeiteten produkts
US12576452B2 (en) 2020-07-27 2026-03-17 Mitsubishi Materials Corporation Drill
JP7268691B2 (ja) * 2021-01-27 2023-05-08 株式会社タンガロイ ドリル
JP7510647B2 (ja) * 2021-02-24 2024-07-04 株式会社デンソー 回転工具
JP7663064B2 (ja) * 2021-11-02 2025-04-16 三菱マテリアル株式会社 ドリル
JP7380813B1 (ja) 2022-11-29 2023-11-15 株式会社タンガロイ 穴あけ工具

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0192019A (ja) * 1987-10-05 1989-04-11 Mitsubishi Metal Corp ドリル
JPH0425308A (ja) * 1990-05-16 1992-01-29 Toshiba Tungaloy Co Ltd ツイストドリル
US20030129031A1 (en) * 2002-01-09 2003-07-10 Allied Machine & Engineering Corp. Drill with specialized drill point geometry
JP2004268230A (ja) * 2003-03-11 2004-09-30 Mitsubishi Materials Corp ドリル
JP2009018360A (ja) * 2007-07-10 2009-01-29 Sumitomo Electric Hardmetal Corp 金属加工用ドリル
WO2009054400A1 (fr) * 2007-10-26 2009-04-30 Sumitomo Electric Hardmetal Corp. Foret hélicoïdal
JP2014008549A (ja) * 2012-06-28 2014-01-20 Sumitomo Electric Hardmetal Corp ドリル

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3900978B2 (ja) * 2002-03-13 2007-04-04 三菱マテリアル株式会社 穴明け工具
SE531188C2 (sv) * 2007-05-29 2009-01-13 Sandvik Intellectual Property Borrkropp för spånavskiljande bearbetning
JP5994654B2 (ja) * 2013-01-23 2016-09-21 三菱マテリアル株式会社 超高硬度焼結体付きドリルおよびその製造方法
CN203621576U (zh) * 2013-04-23 2014-06-04 深圳市航天精密刀具有限公司 一种用于钛合金与碳纤维叠层材料钻削的金刚石钻头

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0192019A (ja) * 1987-10-05 1989-04-11 Mitsubishi Metal Corp ドリル
JPH0425308A (ja) * 1990-05-16 1992-01-29 Toshiba Tungaloy Co Ltd ツイストドリル
US20030129031A1 (en) * 2002-01-09 2003-07-10 Allied Machine & Engineering Corp. Drill with specialized drill point geometry
JP2004268230A (ja) * 2003-03-11 2004-09-30 Mitsubishi Materials Corp ドリル
JP2009018360A (ja) * 2007-07-10 2009-01-29 Sumitomo Electric Hardmetal Corp 金属加工用ドリル
WO2009054400A1 (fr) * 2007-10-26 2009-04-30 Sumitomo Electric Hardmetal Corp. Foret hélicoïdal
JP2014008549A (ja) * 2012-06-28 2014-01-20 Sumitomo Electric Hardmetal Corp ドリル

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019021785A1 (fr) * 2017-07-27 2019-01-31 住友電工ハードメタル株式会社 Foret
US10646934B2 (en) 2017-07-27 2020-05-12 Sumitomo Electric Hardmetal Corp. Drill
JPWO2019021785A1 (ja) * 2017-07-27 2020-05-28 住友電工ハードメタル株式会社 ドリル
JP7078825B2 (ja) 2017-07-27 2022-06-01 住友電工ハードメタル株式会社 ドリル
EP3733334A4 (fr) * 2017-12-26 2021-09-22 Moldino Tool Engineering, Ltd. Foret
US11407040B2 (en) * 2018-05-21 2022-08-09 Osg Corporation Drill
JP6750790B1 (ja) * 2019-10-15 2020-09-02 住友電工ハードメタル株式会社 ドリル
WO2021074958A1 (fr) * 2019-10-15 2021-04-22 住友電工ハードメタル株式会社 Foret
US20230278113A1 (en) * 2020-07-23 2023-09-07 Milwaukee Electric Tool Corporation Step drill bit

Also Published As

Publication number Publication date
CN105473262B (zh) 2017-06-30
CN105473262A (zh) 2016-04-06
JP2016002617A (ja) 2016-01-12
JP6288585B2 (ja) 2018-03-07
DE112015002883T5 (de) 2017-03-02

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