EP0078472A2 - Machine pour affûter les pointes de forets - Google Patents

Machine pour affûter les pointes de forets Download PDF

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Publication number
EP0078472A2
EP0078472A2 EP82109810A EP82109810A EP0078472A2 EP 0078472 A2 EP0078472 A2 EP 0078472A2 EP 82109810 A EP82109810 A EP 82109810A EP 82109810 A EP82109810 A EP 82109810A EP 0078472 A2 EP0078472 A2 EP 0078472A2
Authority
EP
European Patent Office
Prior art keywords
platen
machine
support
drill
inclined surface
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Withdrawn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
EP82109810A
Other languages
German (de)
English (en)
Other versions
EP0078472A3 (fr
Inventor
Chanoch Gay
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.)
Etm Engineers' Tool Manufacturing Co Ltd
Original Assignee
Etm Engineers' Tool Manufacturing Co Ltd
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 Etm Engineers' Tool Manufacturing Co Ltd filed Critical Etm Engineers' Tool Manufacturing Co Ltd
Publication of EP0078472A2 publication Critical patent/EP0078472A2/fr
Publication of EP0078472A3 publication Critical patent/EP0078472A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/24—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills
    • B24B3/247—Supports for drills

Definitions

  • the present invention relates to a machine for reconditioning and regrinding worn points of twist drills.
  • the conventional twist drill is a slender rod shaped piece of steel along which extend two helical flutes (see Fig. 1).
  • the pointed end of the drill shows two oppositely disposed lands, i, e. substantially triangular areas, being mirror representations of one another (see Fig. 1). These areas extend in two curved planer defining an angle between them - and which are also in angular relation to the axis of the drill.
  • the edges of these triangular areas, the so-called "lips" are apt to become worn and require regrinding.
  • Both types of these machines employ holders for the orill which holders - in turn - are carried in a support presenting the drill tip to the grind stone at a predetermined angle, corresponding to ihe angle of the drill point, which is a constant.
  • the known machines have the disadvantage of requiring the change of position of a drill between the grinding of one flank to the opposite one. This is a time consuming operation since it requires also the proper re orientation of the support, drill holder and drill.
  • Another disadvantage is that in order to advance the drill while regrinding, the operation must be stopped to release the drill, reposition it and then restart.
  • Another disadvantage is that the grinding stone must be redressed or smoothened.
  • a further disadvantage is the need to adjust the lip relief setting.
  • a machine for grinding the points of twist drills which comprises, as is usual, a grind stone, a drill holder and a support for the latter, the said support being carried on a platen, which platen is movable in a horizontal plane towards and away from the grindstone, the said platen being further supported on an inclined surface of a member which latter is adapted to be moved so that the place of support of the platen on such inclined surface is at a higher or lower level of the said inclined surface.
  • annular grindstone having an inner, cylindrical face is used.
  • FIGs 1 and 2 there is seen the point of a twist drill with its two lands a and b which have lips a and b 1 .
  • the two lands are ground by being presented to the cylindrical face of a grindstone.
  • the inner cylindrical edge face of an annular grindstone is the one to which the point is held for grinding.
  • the lands are - as seen, of roughly triangular shape, the sides of the triangles being slightly curved.
  • the surface of each land is ground convexly and the respective lip, which is the active cutting part of the drill, is appropriately sharpened.
  • the new machine is mounted on a bottom plate I and derives its drive from an electrical motor 2 which drives the grindstone 3.
  • This latter is an annulus, the inner cylindrical face 3a of which, is operative.
  • a member 4 On bottom plate 1 lies flat a member 4 (also see Fig. 5).
  • Member 4 is plate-like, and has a plane underside with which it rests on plate I.
  • the member 4 is pivotally connected at 4a with the plate 1.
  • At its upper side the member 4 has two inclined areas 5. From its outwardly directed side extends a handle 6.
  • Above member 4 lies a U-shaped member 10 which is journalled between two blocks 9. From the said member 10 extend downwardly screw threaded legs 8 (only one of which is seen in Fig. 2), which, with their lower ends, stand on member 4 within the range of the inclined areas 5.
  • the support S which pivots about an axle lla (Fig. 3). It consists of a plate 11 and two oppositely disposed fixed jaws 12 which between them define a space which tapers towards the grindstone 3.
  • the space constitutes the emplacement for a drill holder.
  • the holder comprises two jaws 13 which are loosely connected by pins 14, fixed in the side cf one of jaws 13, entering holes 15 in the opposite, complementary jaw 13.
  • the portion of both jaws 13 which extends towards the grindstone 3 tapers off gradually in that direction, he sides of the jaws 13 which face one another have each a longitudinally extending groove 16 in which the drill to be reconditioned can be placed.
  • the two jaws 13, held together by pins 14 can be slidingly inserted between the fixed jaws 12.
  • At the rear end of plate 11 extends - normal thereto - a block 17, from which extends a rod or spiral spring 18 which holds jaws 13 in
  • a handle 31 To block 7 there i E connected a handle 31 to which reference will be made later.
  • From the outer side of block 17 extends a centrally bored bar 19 into which enters, via screw 19a, a slender, elongated pin 20, which emerges from a bore in block 17 to enter into a gap between jaws 13 and apply its end onto the rear end of the drill held between jaws 13.
  • This pin can be immobilized. by a set screw 21.
  • By turning screw 19a pin 20 can be moved.
  • the grindstone 3 is enclosed by a protective hood 23 beside which is turnably affixed on plate 2, a block 24, in which is held a locator 25 having a V-cutout 25, said block 24 having a collar 24' with a mark 24".
  • a second mark 25' is marked on the turnable locator 25.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP82109810A 1981-10-30 1982-10-23 Machine pour affûter les pointes de forets Withdrawn EP0078472A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL64173A IL64173A (en) 1981-10-30 1981-10-30 Machine for grinding points of drills
IL64173 1981-10-30

Publications (2)

Publication Number Publication Date
EP0078472A2 true EP0078472A2 (fr) 1983-05-11
EP0078472A3 EP0078472A3 (fr) 1984-10-10

Family

ID=11053006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82109810A Withdrawn EP0078472A3 (fr) 1981-10-30 1982-10-23 Machine pour affûter les pointes de forets

Country Status (4)

Country Link
EP (1) EP0078472A3 (fr)
JP (1) JPS5882655A (fr)
AU (1) AU8969382A (fr)
IL (1) IL64173A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263513A3 (fr) * 1986-10-08 1988-12-14 Toyo Machinery Co., Ltd. Affûteuse de forets ayant un support pour foret inclus des mandrins pour serrer la queue et le corps du foret
CN100519067C (zh) * 2004-06-01 2009-07-29 罗诺曼迪克有限公司 将待加工零件保持在磨床中的保持夹钳
CN102490113A (zh) * 2011-12-06 2012-06-13 东莞市升力智能科技有限公司 一种高精度旋转定位工作台
CN110125737A (zh) * 2019-06-03 2019-08-16 深圳市金洲精工科技股份有限公司 一种托架机构

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3627012A1 (de) * 1986-08-09 1988-02-18 Reinhold Reiling Vorrichtung zum schleifen der schneiden von bohrern
AU620945B2 (en) * 1988-12-19 1992-02-27 David N. Lockwood Improved drill bit sharpener
US5752706A (en) * 1996-07-18 1998-05-19 Hodges; Lyndon W. Adjustable tool holder for machine tools
JP5593425B2 (ja) * 2012-12-19 2014-09-24 昭 三上 刃物砥ぎ具
TWI803868B (zh) * 2021-05-07 2023-06-01 香港商創國興業有限公司 鑽頭的重製方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2512888A (en) * 1948-05-08 1950-06-27 Henry Hildebrandt Apparatus for grinding drills
US3383809A (en) * 1965-05-20 1968-05-21 Paul D. Owen Tool grinding apparatus
US3494080A (en) * 1967-06-14 1970-02-10 Efrain Laguna Machine for grinding split point drills
FR1589568A (fr) * 1968-10-18 1970-03-31
FR2180603A1 (fr) * 1972-04-18 1973-11-30 Isnard Louis

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263513A3 (fr) * 1986-10-08 1988-12-14 Toyo Machinery Co., Ltd. Affûteuse de forets ayant un support pour foret inclus des mandrins pour serrer la queue et le corps du foret
CN100519067C (zh) * 2004-06-01 2009-07-29 罗诺曼迪克有限公司 将待加工零件保持在磨床中的保持夹钳
CN102490113A (zh) * 2011-12-06 2012-06-13 东莞市升力智能科技有限公司 一种高精度旋转定位工作台
CN102490113B (zh) * 2011-12-06 2014-09-03 东莞市升力智能科技有限公司 一种高精度旋转定位工作台
CN110125737A (zh) * 2019-06-03 2019-08-16 深圳市金洲精工科技股份有限公司 一种托架机构
CN110125737B (zh) * 2019-06-03 2024-03-19 深圳市金洲精工科技股份有限公司 一种托架机构

Also Published As

Publication number Publication date
AU8969382A (en) 1983-05-05
IL64173A (en) 1984-03-30
JPS5882655A (ja) 1983-05-18
EP0078472A3 (fr) 1984-10-10
IL64173A0 (en) 1982-01-31

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Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

PUAL Search report despatched

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AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19850410

17Q First examination report despatched

Effective date: 19860429

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19860501

RIN1 Information on inventor provided before grant (corrected)

Inventor name: GAY, CHANOCH