EP0450026A1 - Foret helicoidal - Google Patents

Foret helicoidal

Info

Publication number
EP0450026A1
EP0450026A1 EP90915413A EP90915413A EP0450026A1 EP 0450026 A1 EP0450026 A1 EP 0450026A1 EP 90915413 A EP90915413 A EP 90915413A EP 90915413 A EP90915413 A EP 90915413A EP 0450026 A1 EP0450026 A1 EP 0450026A1
Authority
EP
European Patent Office
Prior art keywords
drill
cutting
twist
cutting part
recess
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.)
Withdrawn
Application number
EP90915413A
Other languages
German (de)
English (en)
Inventor
Gebhard MÜLLER
Simon Escher
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.)
Hertel AG Werkzeuge and Hartstoffe
Original Assignee
Hertel AG Werkzeuge and Hartstoffe
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 Hertel AG Werkzeuge and Hartstoffe filed Critical Hertel AG Werkzeuge and Hartstoffe
Publication of EP0450026A1 publication Critical patent/EP0450026A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/10—Bits for countersinking
    • B23B51/102—Back spot-facing or chamfering
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/34—Combined cutting means
    • Y10T408/352—Combined cutting means including rotating cutter other than rotating, axially moving Tool
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/905—Having stepped cutting edges
    • Y10T408/906—Axially spaced
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/909—Having peripherally spaced cutting edges
    • Y10T408/9095—Having peripherally spaced cutting edges with axially extending relief channel
    • Y10T408/9097—Spiral channel

Definitions

  • the invention relates to a twist drill, in particular made of solid carbide.
  • twist drills for drilling through holes with a device for lowering backwards, which is activated after the through hole has been produced and provides the hole exit with a countersink.
  • Such twist drills with radially fold-out counterbores are structurally complex and, because of the requirement of a certain installation space, can only be realized on drills of a certain diameter.
  • the invention has for its object to provide a twist drill of the type mentioned in such a way that it can also be used to produce a backward lowering of the through hole made with it, without the backward countersink being a separate, fold-out part and thereby requiring a complex folding mechanism.
  • This task assumes that path-controlled, namely CNC milling machines, are also used in modern machine tool technology for drilling such drill holes.
  • the backward lowering on the above-mentioned machines can be easily produced by means of a circular milling process.
  • the twist drill is in one piece and, due to the design according to the invention, is effective in producing the through hole as a drill and in producing the backward countersink as a milling cutter, namely as a circular milling cutter.
  • an excessively negative rake angle of around -30 ° determined by the swirl angle of the swirl groove is avoided.
  • the rake angle of the chip form step is preferably between + 10 ° and -10 °.
  • the insertion length is of course to be dimensioned such that a Backward lowering is possible at all, ie that it is at least as large, but better than the length of the through hole to be drilled.
  • a further embodiment provides that the shoulder of the recess facing away from the cutting edges for lowering forward is likewise designed in the way of circular milling. This embodiment can also be present in isolation, without the other puncture shoulder being designed for lowering backwards.
  • Fig. 2 is a side view of the drill of FIG. 1 in a 90 ° in
  • Figure 3 is a schematic representation of the drill when lowering backwards
  • Fig. 4 is an illustration of the drill when lowering forward in the way of
  • the twist drill In its longitudinal extent, the twist drill essentially consists of the cutting part 1, the shank 2 and the recess 3 in between.
  • the recess 3 forms a shoulder, the diameter 4 of which is larger than the core diameter of the drill but smaller than the drill diameter 5.
  • the between The swirl grooves 6, 7, which are inserted from the cutting part 1 into the recess 2, are formed as step segments 8, 12 which diverge in the direction of the drill cutting edges 10 and have an approximately conical surface shape.
  • a chip shaping step is incorporated to form a backward cutting edge 14 or 15, the rake surface 16 of which extends radially inwards towards the drill axis 18 from the cutting part 1 of the drill beyond the penetration diameter 4 into the swirl groove 6 or 7 is enough.
  • the surfaces of the rake faces are flat. Their rake angle 17 is between + 10 ° and -10 °.
  • the backward cutting edges 14, 15 form an angle 19 with the drill axis 18 on about 45 ° each.
  • the ring segment surfaces 11, 12 are slightly twisted against the swirl direction of the swirl grooves 6, 7 to form the clearance angle around the drill axis 18.
  • the length 33 of the recess 3 corresponds approximately to the cutting length of the cutting part 1.
  • the transition stages 22, 23 located between the swirl grooves 6.7 and immersed in the recess 3 by the further cutting part 21 are as ring segment surfaces meeting in the direction of the drill cutting edges 10 and having an approximately conical surface shape 24.25 trained.
  • a chip shaping step is also incorporated, but here in each case to form a forward cutting edge 26, 27, the chip face 28 of which is also radially inward toward the drill axis 18 from the further cutting part 21 of the drill via the recess diameter 4 extends into the swirl grooves 6,7.
  • the through hole 29 (FIG. 3) is first drilled in the axial feed direction 30.
  • the drill is then laterally offset for backward circular milling with further rotation in the cutting direction 13 in the lateral direction 31, the drill being guided in the circular direction 32, that is to say on a circular arc around the central axis of the borehole, along the ring edge of the outlet opening of the through hole 29.
  • the forward cutting edges 26, 27 of the further cutting part 21 are used for circular milling of the ring edge of the entrance opening of the through hole 29 (FIG. 4).
  • the drill is advanced further in the feed direction 30.

Landscapes

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

Abstract

La partie coupante (1) d'un foret hélicoïdal est pourvue d'une encoche (3) permettant le fraisage circulaire. Des tranchants inverses (14, 15) incorporés dans les gradins de transition (8, 9) entre la partie coupante (1) et l'encoche (3) présentent des faces de coupe (16) qui s'étendent radialement vers l'intérieur en direction de l'axe (18) du foret en partant de la partie coupante (1) de ce dernier au-delà du diamètre (4) de l'encoche pour aboutir dans les rainures hélicoïdales (6, 7).
EP90915413A 1989-10-31 1990-10-31 Foret helicoidal Withdrawn EP0450026A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8912860U 1989-10-31
DE8912860U DE8912860U1 (de) 1989-10-31 1989-10-31 Spiralbohrer

Publications (1)

Publication Number Publication Date
EP0450026A1 true EP0450026A1 (fr) 1991-10-09

Family

ID=6844165

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90915413A Withdrawn EP0450026A1 (fr) 1989-10-31 1990-10-31 Foret helicoidal

Country Status (4)

Country Link
US (1) US5186584A (fr)
EP (1) EP0450026A1 (fr)
DE (1) DE8912860U1 (fr)
WO (1) WO1991006387A1 (fr)

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9207000U1 (de) * 1992-05-23 1993-06-24 Heule, Heinrich, Au Entgratwerkzeug mit zusätzlichem Schneidwerkzeug
DE4228322A1 (de) * 1992-08-26 1994-03-03 Guenther Wirth Bohrfräser
FR2713527B1 (fr) * 1993-12-08 1996-01-12 Snecma Foret de perçage à tête hémisphérique à coupe évolutive.
GB9606370D0 (en) * 1996-03-26 1996-06-05 Dormer Tools Sheffield Ltd Improvements in or relating to twist drills
US7018143B2 (en) * 1996-08-15 2006-03-28 Bitmoore, An Oregon General Partnership Reduced energy consuming, lateral cutting twist drill
DE19735024B4 (de) * 1997-08-13 2006-09-28 Bauer, Walter, Dr.-Ing. Bohrer für zusätzliche Rückseitenbearbeitung
DE29803261U1 (de) * 1998-02-25 1998-04-16 Giess & Quanz Gmbh Bohrwerkzeug
JPH11254218A (ja) * 1998-03-09 1999-09-21 Masao Kubota 穴加工を主体とする複合切刃工具及び加工方法
US5944462A (en) * 1998-04-23 1999-08-31 Kennametal Inc. Hole cutting tool for chamfering and grooving
US5921728A (en) * 1998-10-23 1999-07-13 K-Line Industries, Inc. Reamer with radial relief and cutting land
WO2003018242A1 (fr) * 2001-08-23 2003-03-06 Bitmoore, An Oregon General Partnership Foret helicoidal a coupe laterale a consommation reduite d'energie,
US6739809B2 (en) 2001-09-19 2004-05-25 Kennametal Inc. Cutting point for a drill
US6637987B2 (en) 2002-02-26 2003-10-28 Choon Nang Electrical Appliance Mfy., Ltd. Drill bit
US20050019115A1 (en) * 2003-07-24 2005-01-27 Gatton Geoffrey L. Tool and method for forming a valve stem hole
DE10346217A1 (de) * 2003-09-24 2005-04-28 Mapal Fab Praezision Bohrer
US7226250B2 (en) * 2003-12-22 2007-06-05 Hayes Lemmerz International, Inc. Tool and method for forming a lug hole
KR101141414B1 (ko) 2008-10-27 2012-05-03 (주)대동석재공업 타공장치
DE102012012479A1 (de) * 2012-03-26 2013-09-26 MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG Bohrer
CN104325180A (zh) * 2014-10-16 2015-02-04 芜湖中铁科吉富轨道有限公司 一种钢轨钻孔倒棱用刀具及其加工工艺
JP6247807B2 (ja) * 2014-12-12 2017-12-13 株式会社 東陽 切削工具及びこの切削工具を備えた切削装置
US10399151B2 (en) * 2016-02-17 2019-09-03 The Boeing Company Methods of forming holes in a workpiece and associated systems
EP3246120A1 (fr) * 2016-05-18 2017-11-22 HILTI Aktiengesellschaft Perceuse a metaux
CN109562465A (zh) * 2016-12-01 2019-04-02 三菱重工业株式会社 钻头以及具有该钻头的开孔加工装置
JP7064674B2 (ja) * 2017-05-26 2022-05-11 株式会社 東陽 切削工具及びこの切削工具を備えた切削装置
US10245656B2 (en) 2017-07-27 2019-04-02 Greenlee Tools, Inc. Step bit
US10328500B2 (en) * 2017-08-03 2019-06-25 Greenlee Tools, Inc. Cutting and deburring tool
JP6729853B2 (ja) * 2018-08-07 2020-07-29 住友電工ハードメタル株式会社 ドリル
CN112243398A (zh) 2018-09-04 2021-01-19 Mk工具服务有限公司 钻头
CN109352037A (zh) * 2018-11-30 2019-02-19 东风设备制造有限公司 带正反倒角通孔加工用复合刀具
CN109877366B (zh) * 2019-03-05 2020-09-08 广东长盈精密技术有限公司 复合刀具

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3122947A (en) * 1964-03-03 Deburring tool
US1471866A (en) * 1921-04-06 1923-10-23 Albert E Simpson Drill
SE454957B (sv) * 1980-03-24 1988-06-13 Tryckluftteknik Harald Neumann Rotationsverktyg
DE8225992U1 (de) * 1982-09-15 1982-12-23 Kadia Diamant Maschinen- und Werkzeugfabrik O. Kopp GmbH & Co, 7440 Nürtingen Bohr- und entgratkopf und darin einspannbares bohr- und entgratwerkzeug
US4842451A (en) * 1988-02-05 1989-06-27 Dugger Ben A Deburring drill bit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9106387A1 *

Also Published As

Publication number Publication date
WO1991006387A1 (fr) 1991-05-16
DE8912860U1 (de) 1990-02-01
US5186584A (en) 1993-02-16

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19910619

AK Designated contracting states

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Effective date: 19930713