EP0489410B1 - Dispositif pour l'affûtage de forets - Google Patents

Dispositif pour l'affûtage de forets Download PDF

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Publication number
EP0489410B1
EP0489410B1 EP91120783A EP91120783A EP0489410B1 EP 0489410 B1 EP0489410 B1 EP 0489410B1 EP 91120783 A EP91120783 A EP 91120783A EP 91120783 A EP91120783 A EP 91120783A EP 0489410 B1 EP0489410 B1 EP 0489410B1
Authority
EP
European Patent Office
Prior art keywords
grinding
grinding surface
grinding wheel
drill
guide
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.)
Expired - Lifetime
Application number
EP91120783A
Other languages
German (de)
English (en)
Other versions
EP0489410A1 (fr
Inventor
Folke Werner
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0489410A1 publication Critical patent/EP0489410A1/fr
Application granted granted Critical
Publication of EP0489410B1 publication Critical patent/EP0489410B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B24B3/26—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills of the point of twist drills
    • B24B3/265—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills of the point of twist drills using devices specially adapted for domestic use

Definitions

  • the invention relates to a drill grinding device according to the preamble of claim 1.
  • a straightening arrangement is therefore provided which correspondingly wears down the areas of the grinding surface which are less worn by the drills and the surface section of the grinding wheel which is perpendicular to the central axis, so that such step formation is prevented and the angle of inclination of the grinding surface is retained.
  • no step can arise in the grinding wheel at the end of the grinding surface closest to the drill guide piece, since, seen in the radial direction, no grinding wheel material is present outside this end.
  • the outer ends of the main cutting edges are therefore not rounded.
  • the angle of rise of the grinding surface decreases, with an increase in the tip angle of the drill, which is, however, tolerable within certain limits.
  • devices for example by US-PS 3753320, are known in which a conical grinding surface at its end closest to the drill guide piece forms an acute-angled ridge with the adjoining surface section of the grinding wheel.
  • the guide channels are arranged there in such a way that their center axes meet the end of the grinding surface furthest away from the drill guide piece.
  • a further feature of the invention prevents large pieces of the grinding wheel from breaking out on the ridge in that the surface section of the grinding wheel forming the burr together with the grinding surface is also conical.
  • a particularly efficient material transport from the grinding surface is achieved according to a further feature of the invention in that the grinding surface is an outer cone.
  • FIG. 1 shows a longitudinal section through the exemplary embodiment
  • FIG. 2 shows a plan view of two guide channels, seen in the direction of arrow A in FIG. 1, on a larger scale
  • FIG. 3 shows a detail from FIG. 1 with one into a guide channel 4 to FIG. 3, but after prolonged wear of the grinding wheel
  • FIG. 5 is a plan view of a drill tip.
  • the various parts of the exemplary embodiment are arranged concentrically around the central axis 1.
  • An axis 2 is the spindle of a motor (not shown) arranged in the housing 3.
  • the axis 2 is axially fixed in ball bearings 4.
  • a grinding wheel carrier 5 is fixed between the bearing 4 and the nut 6.
  • An annular grinding wheel 7 is glued to the grinding wheel carrier 5. On its flank facing away from the motor, the grinding wheel has an externally conical grinding surface 8 which, together with an inner cone 9, forms an acute-angled ridge 10.
  • the grinding surface 8 forms with its plane of rotation the angle ⁇ 1 of 35 °, the inner cone 9 the angle ⁇ of 75 °. This gives the acute angle ⁇ of 70 ° on the ridge 10.
  • a drill guide piece 11, 12 is arranged opposite the grinding surface 8. This is rigidly connected to the housing 3 and is composed of a guide channel body 11 and a guide pin plate 12 rigidly connected to it.
  • the guide channel body 11 has guide channels 13 of different diameters which are parallel to the central axis 1 and which externally affect an imaginary cylinder jacket 14 which is coaxial with the central axis 1.
  • the diameter of the cylinder jacket 14 is equal to the diameter of the burr 10 of the grinding wheel.
  • the guide pin plate 12 has openings 15 aligned with the guide channels 13, into each of which two trapezoidal guide pins 16 project for engagement in the flutes 20 of a drill inserted into the guide channel. These each have two stop edges 17 and are dimensioned such that they permit an approximately 30 ° rotation about its axis of the drill inserted into the guide channel.
  • the drill to be ground is inserted by hand into the smallest suitable guide channel 13 and between the guide pins 16 therein until one of its rear grinding surfaces 18 strikes against the rotating grinding surface 8.
  • the periphery of the drill touches approximately the ridge 10.
  • the drill which is pressed lightly against the grinding surface, is now rotated back and forth a few times between the stop edges 17 of the guide pins. It is then pulled back a little, rotated by 180 °, inserted again to the grinding surface and rotated back and forth. Both relief surfaces are now ground.
  • the wear of the grinding wheel is greatest directly on the ridge 10 and decreases continuously with increasing distance from the ridge. In the area of the cutting edge 19 of the drill, the wear of the grinding wheel is minimal. The angle of increase ⁇ of the grinding surface 8 will therefore decrease with increasing wear of the grinding wheel. When the angle of rise ⁇ of the grinding surface has decreased to approximately 30 ° ( ⁇ 2 in FIG. 4), the grinding wheel is replaced. One step in the grinding wheel at the end of the ridge However, the grinding surface cannot be created, since there is no grinding wheel material outside this end of the grinding surface, viewed in the radial direction. The main cutting edges 21 of the drills always remain straight.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Drilling Tools (AREA)

Claims (1)

  1. Dispositif pour l'affûtage de forets hélicoïdaux pourvus de surfaces en dépouille (18), et d'une goujure (20) et d'un tranchant principal (21) pour chaque surface en dépouille (18), comportant
    - un axe médian (1),
    - une meule (7) disposée en rotation autour de l'axe médian (1) et pourvue d'une surface d'affûtage extérieure conique (8) dont l'extrémité intérieure (10) définit un cercle coaxial, et
    - un élément de guidage (11, 12) qui est disposé en face de la surface d'affûtage (8) et qui comporte des conduits de guidage (13) globalement parallèles à l'axe médian (1) et, dans ces conduits de guidage (13), des ergots de guidage (16) qui pénètrent dans les goujures (20) d'un foret introduit jusqu'à la surface d'affûtage et qui limitent une rotation autour de son axe, les conduits de guidage (13) étant globalement tangents à une enveloppe cylindrique imaginaire coaxiale (14) qui rencontre l'extrémité intérieure (10) de la surface d'affûtage (8),
    caractérisé en ce que la surface d'affûtage (8) forme avec une section de surface intérieure conique (9) de la meule (7) qui fait suite à son extrémité intérieure (10) une arête à angle aigu (10).
EP91120783A 1990-12-03 1991-12-03 Dispositif pour l'affûtage de forets Expired - Lifetime EP0489410B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4038524 1990-12-03
DE4038524A DE4038524A1 (de) 1990-12-03 1990-12-03 Bohrerschleifeinrichtung

Publications (2)

Publication Number Publication Date
EP0489410A1 EP0489410A1 (fr) 1992-06-10
EP0489410B1 true EP0489410B1 (fr) 1997-09-24

Family

ID=6419494

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91120783A Expired - Lifetime EP0489410B1 (fr) 1990-12-03 1991-12-03 Dispositif pour l'affûtage de forets

Country Status (6)

Country Link
US (1) US5210977A (fr)
EP (1) EP0489410B1 (fr)
JP (1) JP2556790B2 (fr)
AU (1) AU646905B2 (fr)
CA (1) CA2056162A1 (fr)
DE (2) DE4038524A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5788559A (en) * 1994-02-25 1998-08-04 Jungnitsch; Paul Lewis Web adjust drill bit sharpener and method of using
US5564871A (en) * 1994-06-16 1996-10-15 Lagsdin; Andry Chamfer machine
US5676591A (en) * 1996-08-13 1997-10-14 Huang; Cheng-Hsien Bit sharpener
US9199315B2 (en) 2000-06-02 2015-12-01 Kennametal Inc. Twist drill and method for producing a twist drill which method includes forming a flute of a twist drill
US6676500B1 (en) * 2002-11-12 2004-01-13 Sophin Lin Drill bit sharpener
JP2005262341A (ja) * 2004-03-16 2005-09-29 Noritake Super Abrasive:Kk Ｃｍｐパッドコンディショナー
US7488239B2 (en) * 2006-11-08 2009-02-10 Rolf Tamm Assembly for grinding electrodes
DE102009044855A1 (de) * 2009-12-10 2011-06-16 Rolf Tamm Bausatz zum Nachrüsten einer Elektrodenschleifvorrichtung und Elektrodenschleifvorrichtung
US8690643B2 (en) * 2010-07-06 2014-04-08 Western New England University Portable drill bit sharpener
CN102126952A (zh) * 2010-12-17 2011-07-20 张家港瀚康化工有限公司 丁二酸单乙酯酰氯的制备方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2078306A (en) * 1935-12-26 1937-04-27 Roderick O Baalmann Drill sharpener
US3067548A (en) * 1960-06-06 1962-12-11 Winslow Product Engineering Co Drill pointing method and machine
SE325210B (fr) * 1967-05-03 1970-06-22 R Wurscher
US3579924A (en) * 1967-05-10 1971-05-25 Mataichi Saito Method for continuously grinding a drill tip end into a normal shape and into a split point
US3742652A (en) * 1970-03-06 1973-07-03 Black & Decker Mfg Co Drill sharpener
DE2343228A1 (de) * 1973-08-28 1975-03-20 Bosch Gmbh Robert Bohrerschleifeinrichtung
GB2132518B (en) * 1982-12-17 1986-03-26 Keith Harris Stand for storing and sharpening chisels, plane irons and drill bits
AT380419B (de) * 1984-02-14 1986-05-26 Wurscher Raimund August Einrichtung zum schleifen von spiralbohrern
AT380418B (de) * 1984-02-14 1986-05-26 Wurscher Raimund August Einrichtung zum schleifen von spiralbohrern
GB8509028D0 (en) * 1985-04-09 1985-05-15 Bicc Plc Honing tool
AT385703B (de) * 1986-07-07 1988-05-10 Wurscher Raimund Einrichtung zum schleifen von spiralbohrern

Also Published As

Publication number Publication date
US5210977A (en) 1993-05-18
JPH0523956A (ja) 1993-02-02
AU8827391A (en) 1992-06-04
DE59108860D1 (de) 1997-10-30
JP2556790B2 (ja) 1996-11-20
EP0489410A1 (fr) 1992-06-10
DE4038524C2 (fr) 1992-11-12
DE4038524A1 (de) 1992-06-04
CA2056162A1 (fr) 1992-06-04
AU646905B2 (en) 1994-03-10

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