US3885925A - Method for the sharpening of four faces drills and sharpening machine for carrying out this method - Google Patents

Method for the sharpening of four faces drills and sharpening machine for carrying out this method Download PDF

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Publication number
US3885925A
US3885925A US407131A US40713173A US3885925A US 3885925 A US3885925 A US 3885925A US 407131 A US407131 A US 407131A US 40713173 A US40713173 A US 40713173A US 3885925 A US3885925 A US 3885925A
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Prior art keywords
drill
wheels
grinding
wheel
sharpening
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Expired - Lifetime
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US407131A
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English (en)
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Alexander Tatar
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    • 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
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/002—Grinding heads

Definitions

  • the method according to the invention is characterized by the fact that, for each pair of faces of a four faced drill to be sharpened, the drill having cutting and clearance faces, one may urge the drill to pass a first time opposite two grinding wheels, one of which, having the thinnest grain, is then situated back from the alignment of the working plane of the other grinding wheel, such that only the last named wheel which has the roughest grain, contacts the drill and shapes the clearance face thereof; thereafter, the drill may be urged to'pass anew opposite the two grinding wheels, during a reverse movement, after a relative movement between the drill and the grinding wheels has been effected, such that the grinding wheel then contacts the cutting face of the drill after the two grinding wheels have been brought into a same plane.
  • the grinding wheel having the roughest grain shapes first the cutting face of the drill and the grinding wheel having the thinnest grain finishes the operation on this same face.
  • the machine constructed in accord the invention is characterized by the fact that it comprises two grinding wheels having different grains mounted in such a way as to be able to effect a relative movement such that they can occupy a position in which only the grinding wheel having the roughest grain is able to work, and a position in which both are able to work.
  • Means are provided to permit the drill to move opposite to the said grinding wheels and means synchronizing the movements of the grinding wheels and of the drill are provided so that, in one direction of the displacements of the drill opposite the grinding wheels, only the grinding wheel having the roughest grain makes contact with the ,drill while, in the reverse direction, the two grinding wheels operate successively, the one having the roughest grain first attacking the drill and the one having the thinnest grain then finishing the work.
  • the drawing shows, by way of example, one embodiment of apparatus constructed in accordance with the invention, and one modification thereof.
  • FIG. 1 is a partial axial sectional view of a sharpening machine for four faced drills.
  • FIGS. 2 and 3 are sectional views of a detail, in two different working positions, showing the sharpening processes, and
  • FIGS. 4 and 5 are sectional views of a detail of a modification, corresponding respectively to FIGS. 2 and 3 of the embodiment of FIG. 1.
  • the present machine comprises a quill 1 adapted to rotate in a headstock 2.
  • Quill l carries at one of its ends, a pulley 3 driven by a belt 4 which is itself driven by a motor not shown.
  • the quill l carries, at its opposite end, the hub 5 of a bell shaped grinding wheel 6.
  • the hub 5 carries, freely mounted thereon, a plate 7 which itself carries a bell shaped grinding wheel 8, the grain of which is thinner than that of the grinding wheel 6.
  • a driving finger 13 carried by the hub 5 and which is engaged in a hole of the plate 7 renders the plate angularly rigid with the hub 5, in such a way that the two grinding wheels are rotatably driven by the quill 1.
  • the quill is traversed by two sliding rods 14 connected at their rear ends by a yoke 15 and which are engaged, at their front ends, in a ring 16 which is in contact, by the intermediary of roller bearing 17, with the plate 7.
  • a pusher 18 is controlled by an electromagnet, the coil 19 of which (diagrammatically shown), acts on the yoke 15 for moving it towards the right side of FIG. 1.
  • Yoke 15 operates rods 14 to move ring 16 and bearings 17 against plate 7 to force plate 7 toward the right as viewed in FIG. 1, against the action of the springs 9, bringing the grinding wheel 8 into a position in which its working plane 11 coincides with the working plane 12 of the grinding wheel 6.
  • a four faced drill such as drill 20 of FIG. 2 and 3 is moved opposite the two grinding wheels in the direction of the arrow 21 of FIG. 2 while the grinding wheels occupy their relative position in which the grinding wheel 8 is eclipsed and only grinding wheel 6 is able to work.
  • the axis of the drill then occupies the position indicated by I in FIGS. 2 and 3.
  • the grinding wheel 6, the grain of which is rougher than that of wheel 8 shapes one of the clearance faces of the drill, which face is designated by 22.
  • the drill is then rocked or pivoted with respect to the working plane of the grinding wheel so that the axis of the drill occupies the position indicated at II in FIGS. 2 and 3, while the grinding wheel 8 is advanced so that its working plane coincides with that of the grinding wheel 6.
  • the synchronisation of the movements is obtained, for instance, by means of a micro-switch feeding the coil 19 of the electro-magnet controlling the pusher 18, which microswitch is itself operated for instance by the carriage, not represented, which carries the drill 20 and which produces its movements opposite the grinding wheel.
  • one of the cutting faces 24 of the drill is first shaped by the grinding wheel 6, the grain of which is rougher than that of wheel 8, then polished by the grinding wheel 8 the grain of which is thinner than that of wheel 6.
  • the relative movement between the grinding wheel and the drill which is effected after the first displacement of the drill, so as to present its cutting face after its clearance face into contact with the grinding wheels. can be effected instead of being obtained by a rocking movement of the drill by rocking the two grinding wheels. This rocking is possible if the headstock 2 of the quill l is articulated on the frame of the machine.
  • FIGS. 4 and 5 ifhe modification described above is represented in FIGS. 4 and 5 in which. as it can be seen, the axis of the tirill maintains its direction unchanged while, on the contrary. the grinding wheels 6 and 8 have their worktng plane situated in a position l in FIG 4 and in a position ll in FIG. 5. the passage from one to the other peing obtained by a rocking movement through the grinding wheels. of an angle equivalent to the angle be tween the two positions l and II of the drill 20 in FIGS. l and 2.
  • Machine for sharpening a four faced drill comprising, two grinding wheels respectively having grinding surfaces of different grain roughnesses. said wheels being cooperatively mounted for movement one relative the other to alternatively occupy a first position in which only the grinding wheel having the rougher grain surface is operable on the drill and a second position in which both wheels are so operable, means for moving the drill opposite said wheels, and means for synchronizing the movement of the grinding wheels and the drill, whereby in one direction of displacement of the drill opposite the grinding wheels only the grinding wheel having the rougher grain surface makes contact with the drill and in the reverse direction of displacement of the drill the two wheels operate successively on the drill such that the wheel having the rougher grain surface first makes contact with the drill and immediately thereafter the wheel having the thinner grain surface makes contact with the drill to finish the sharpening of the drill.
  • Machine is claimed in claim 4 in which said grinding wheels are of generally bell-shaped configuration and are mounted concentrically one with the other, the wheel with the thinner grain surface being positioned surrounding the wheel with the rougher grain surface and being moveable axially relative to the wheel with the rougher grain surface between a first eclipsed position in which the working plane of the thinner grain grinding surface is positioned behind the working plane of the wheel with the rougher grain grinding surface and a second position in which the grinding surfaces of the two wheels are in the same working plane.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US407131A 1972-10-23 1973-10-17 Method for the sharpening of four faces drills and sharpening machine for carrying out this method Expired - Lifetime US3885925A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1546172A CH553621A (fr) 1972-10-23 1972-10-23 Procede pour l'affutage de forets a quatre faces et machine d'affutage pour la mise en oeuvre de ce procede.

Publications (1)

Publication Number Publication Date
US3885925A true US3885925A (en) 1975-05-27

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US407131A Expired - Lifetime US3885925A (en) 1972-10-23 1973-10-17 Method for the sharpening of four faces drills and sharpening machine for carrying out this method

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US (1) US3885925A (enrdf_load_stackoverflow)
CH (1) CH553621A (enrdf_load_stackoverflow)
DE (1) DE2352320A1 (enrdf_load_stackoverflow)
FR (1) FR2204136A5 (enrdf_load_stackoverflow)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4442637A (en) * 1979-03-27 1984-04-17 Alexander Ahejew Simultaneous double-acting split abrasive wheel for peripheral sharpening of helix tools and use thereof
US5168661A (en) * 1990-05-30 1992-12-08 The Gleason Works Method of grinding the surfaces of cutting blades and grinding wheel therefor
US5241794A (en) * 1990-05-30 1993-09-07 The Gleason Works Grinding wheel for cutting blades
WO1999002306A1 (en) * 1997-07-10 1999-01-21 Unova U.K. Limited Grinding machine spindle
WO1999039873A1 (de) * 1998-02-04 1999-08-12 Koennemann Ronny Schleifspindel
US20050020198A1 (en) * 2003-05-09 2005-01-27 Peter Nagel Device for the precision working of planar surfaces
US20050173377A1 (en) * 2004-02-05 2005-08-11 Georg Pietsch Semiconductor wafer, apparatus and process for producing the semiconductor wafer
US7303461B1 (en) 2006-12-05 2007-12-04 Pratt & Whitney Canada Corp. Method of machining airfoils by disc tools
US20090209186A1 (en) * 2007-02-16 2009-08-20 Bernhard Krauss Grinding disc for an eccentric grinder
US20100093264A1 (en) * 2008-10-10 2010-04-15 Strasbaugh, Inc. Grinding apparatus having an extendable wheel mount
US20120196510A1 (en) * 2011-01-31 2012-08-02 Apple Inc. Machining process and tools
US20130023188A1 (en) * 2011-07-21 2013-01-24 Taiwan Semiconductor Manufacturing Company, Ltd. Apparatus for Wafer Grinding
US20130102227A1 (en) * 2011-10-21 2013-04-25 Strasbaugh Systems and methods of wafer grinding
US8587939B2 (en) 2011-01-31 2013-11-19 Apple Inc. Handheld portable device
US8665160B2 (en) 2011-01-31 2014-03-04 Apple Inc. Antenna, shielding and grounding
CN104907611A (zh) * 2014-03-13 2015-09-16 钴碳化钨硬质合金公司 一种旋转工具,特别是一种钻孔工具,以及制造旋转工具的方法
US20160129556A1 (en) * 2014-11-06 2016-05-12 Disco Corporation Grinding apparatus
US9393669B2 (en) 2011-10-21 2016-07-19 Strasbaugh Systems and methods of processing substrates
US9457446B2 (en) 2012-10-01 2016-10-04 Strasbaugh Methods and systems for use in grind shape control adaptation
US9610669B2 (en) 2012-10-01 2017-04-04 Strasbaugh Methods and systems for use in grind spindle alignment
US20170368659A1 (en) * 2016-06-28 2017-12-28 Disco Corporation Processing apparatus

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2309016A (en) * 1942-02-09 1943-01-19 Norton Co Composite grinding wheel
US2594137A (en) * 1949-09-12 1952-04-22 Titan Abrasives Company Grinding wheel
US2600815A (en) * 1949-04-20 1952-06-17 Eastman Kodak Co Apparatus for rough and fine grinding of spherical surfaces
US2749684A (en) * 1950-03-18 1956-06-12 Joh Urbanek & Co Combined grinding and lapping disc having flat working surfaces
US2932135A (en) * 1956-12-18 1960-04-12 Tatar Alexander Machine for sharpening four-face drills
US3067551A (en) * 1958-09-22 1962-12-11 Bethlehem Steel Corp Grinding method
US3626436A (en) * 1966-07-19 1971-12-07 Renault Machine for sharpening twist drills

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2309016A (en) * 1942-02-09 1943-01-19 Norton Co Composite grinding wheel
US2600815A (en) * 1949-04-20 1952-06-17 Eastman Kodak Co Apparatus for rough and fine grinding of spherical surfaces
US2594137A (en) * 1949-09-12 1952-04-22 Titan Abrasives Company Grinding wheel
US2749684A (en) * 1950-03-18 1956-06-12 Joh Urbanek & Co Combined grinding and lapping disc having flat working surfaces
US2932135A (en) * 1956-12-18 1960-04-12 Tatar Alexander Machine for sharpening four-face drills
US3067551A (en) * 1958-09-22 1962-12-11 Bethlehem Steel Corp Grinding method
US3626436A (en) * 1966-07-19 1971-12-07 Renault Machine for sharpening twist drills

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4442637A (en) * 1979-03-27 1984-04-17 Alexander Ahejew Simultaneous double-acting split abrasive wheel for peripheral sharpening of helix tools and use thereof
US5168661A (en) * 1990-05-30 1992-12-08 The Gleason Works Method of grinding the surfaces of cutting blades and grinding wheel therefor
US5241794A (en) * 1990-05-30 1993-09-07 The Gleason Works Grinding wheel for cutting blades
CN1081512C (zh) * 1997-07-10 2002-03-27 尤诺瓦英国有限公司 具有单旋转主轴的机床
US6277002B1 (en) 1997-07-10 2001-08-21 Unova U.K. Limited Grinding machine spindle
WO1999002306A1 (en) * 1997-07-10 1999-01-21 Unova U.K. Limited Grinding machine spindle
WO1999039873A1 (de) * 1998-02-04 1999-08-12 Koennemann Ronny Schleifspindel
US7014540B2 (en) * 2003-05-09 2006-03-21 Kadia Produktion Gmbh + Co. Device for the precision working of planar surfaces
US20050020198A1 (en) * 2003-05-09 2005-01-27 Peter Nagel Device for the precision working of planar surfaces
US7867059B2 (en) 2004-02-05 2011-01-11 Siltronic Ag Semiconductor wafer, apparatus and process for producing the semiconductor wafer
US20090203297A1 (en) * 2004-02-05 2009-08-13 Siltronic Ag Semiconductor Wafer, Apparatus and Process For Producing The Semiconductor Wafer
US20050173377A1 (en) * 2004-02-05 2005-08-11 Georg Pietsch Semiconductor wafer, apparatus and process for producing the semiconductor wafer
US7303461B1 (en) 2006-12-05 2007-12-04 Pratt & Whitney Canada Corp. Method of machining airfoils by disc tools
US20090209186A1 (en) * 2007-02-16 2009-08-20 Bernhard Krauss Grinding disc for an eccentric grinder
US8113921B2 (en) * 2007-02-16 2012-02-14 Robert Bosch Gmbh Tool set for an eccentric grinder
US20100093264A1 (en) * 2008-10-10 2010-04-15 Strasbaugh, Inc. Grinding apparatus having an extendable wheel mount
US8133093B2 (en) * 2008-10-10 2012-03-13 Strasbaugh, Inc. Grinding apparatus having an extendable wheel mount
US9444131B2 (en) 2011-01-31 2016-09-13 Apple Inc. Antenna, shielding and grounding
US20120196510A1 (en) * 2011-01-31 2012-08-02 Apple Inc. Machining process and tools
US11480998B2 (en) 2011-01-31 2022-10-25 Apple Inc. Handheld portable device
US8587939B2 (en) 2011-01-31 2013-11-19 Apple Inc. Handheld portable device
US8665160B2 (en) 2011-01-31 2014-03-04 Apple Inc. Antenna, shielding and grounding
US8911280B2 (en) * 2011-01-31 2014-12-16 Apple Inc. Apparatus for shaping exterior surface of a metal alloy casing
US10658744B2 (en) 2011-01-31 2020-05-19 Apple Inc. Antenna, shielding and grounding
US10474193B2 (en) 2011-01-31 2019-11-12 Apple Inc. Handheld portable device
US9710017B2 (en) 2011-01-31 2017-07-18 Apple Inc. Method of forming a housing for an electronic device
US20130023188A1 (en) * 2011-07-21 2013-01-24 Taiwan Semiconductor Manufacturing Company, Ltd. Apparatus for Wafer Grinding
US9566683B2 (en) 2011-07-21 2017-02-14 Taiwan Semiconductor Manufacturing Company, Ltd. Method for wafer grinding
US9120194B2 (en) * 2011-07-21 2015-09-01 Taiwan Semiconductor Manufacturing Company, Ltd. Apparatus for wafer grinding
US9393669B2 (en) 2011-10-21 2016-07-19 Strasbaugh Systems and methods of processing substrates
US8968052B2 (en) * 2011-10-21 2015-03-03 Strasbaugh Systems and methods of wafer grinding
US20130102227A1 (en) * 2011-10-21 2013-04-25 Strasbaugh Systems and methods of wafer grinding
US9457446B2 (en) 2012-10-01 2016-10-04 Strasbaugh Methods and systems for use in grind shape control adaptation
US9610669B2 (en) 2012-10-01 2017-04-04 Strasbaugh Methods and systems for use in grind spindle alignment
CN104907611A (zh) * 2014-03-13 2015-09-16 钴碳化钨硬质合金公司 一种旋转工具,特别是一种钻孔工具,以及制造旋转工具的方法
CN104907611B (zh) * 2014-03-13 2020-04-10 钴碳化钨硬质合金公司 一种旋转工具，特别是一种钻孔工具，以及制造旋转工具的方法
US20160129556A1 (en) * 2014-11-06 2016-05-12 Disco Corporation Grinding apparatus
US9731402B2 (en) * 2014-11-06 2017-08-15 Disco Corporation Grinding apparatus
US20170368659A1 (en) * 2016-06-28 2017-12-28 Disco Corporation Processing apparatus

Also Published As

Publication number Publication date
FR2204136A5 (enrdf_load_stackoverflow) 1974-05-17
DE2352320A1 (de) 1974-05-02
CH553621A (fr) 1974-09-13

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