EP0152400A2 - Dispositif pour l'affûtage de forets hélicoidaux - Google Patents

Dispositif pour l'affûtage de forets hélicoidaux Download PDF

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Publication number
EP0152400A2
EP0152400A2 EP85890035A EP85890035A EP0152400A2 EP 0152400 A2 EP0152400 A2 EP 0152400A2 EP 85890035 A EP85890035 A EP 85890035A EP 85890035 A EP85890035 A EP 85890035A EP 0152400 A2 EP0152400 A2 EP 0152400A2
Authority
EP
European Patent Office
Prior art keywords
grinding
grinding surface
drill
guide
guide pin
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.)
Granted
Application number
EP85890035A
Other languages
German (de)
English (en)
Other versions
EP0152400A3 (en
EP0152400B1 (fr
Inventor
Raimund Wurscher
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.)
Wurscher Raimund
Original Assignee
Wurscher Raimund
INTERMEDIUM AG
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 Wurscher Raimund, INTERMEDIUM AG filed Critical Wurscher Raimund
Publication of EP0152400A2 publication Critical patent/EP0152400A2/fr
Publication of EP0152400A3 publication Critical patent/EP0152400A3/de
Application granted granted Critical
Publication of EP0152400B1 publication Critical patent/EP0152400B1/fr
Expired 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

Definitions

  • the invention relates to a device for grinding twist drills with relief surfaces and a relief groove for each relief surface, with a drive axis on which a grinding wheel with a grinding surface is rigidly fastened, and with a drill guide piece arranged opposite the grinding surface and axially immovable with respect to it. through which guide channels of different diameters extend for guiding the relief surfaces of drills of different diameters to the grinding surface and to which at least one guide pin is assigned for each guide channel and which engages in a flute of a drill inserted into the guide channel, all of the guide pins being provided in one between the drill guide piece and the grinding surface Guide pin carriers are arranged.
  • the guide pin carrier is arranged to be axially immovable, but can be pivoted in a certain region around the drive axis in order to adjust the radial position of the guide pins in the guide channels.
  • the guide pins are parts of the drill guide piece, the drill guide piece with respect to which to adjust the distance of the guide pins from the grinding surface Grinding surface is axially adjustable.
  • a disadvantage of the known devices described above is, above all, that the grinding surface moves away from the guide pin due to the wear of the grinding wheel, which requires that the correct distance between the guide pin and the grinding surface is reset (US Pat. No. 3,753,320) or the radial location of the Guide pin in the guide channels is changed (US Pat. No. 3,742,652).
  • Another disadvantage is the fact that after long grinding of small diameter drills - ie of drills that do not touch the entire grinding surface when the grinding wheel rotates - wear of the grinding wheel results in a grooved or step-shaped deformation of the grinding surface. If a larger drill is then ground, this deformation is imprinted in the main cutting edge of this larger drill. If the deformation reaches a certain extent, the grinding wheel will ultimately become completely unusable.
  • the invention is therefore based on the object of providing a drill grinding device in which not only drills of different diameters can be ground without having to clamp them, but also in which the correct distance of the grinding surface from the guide pins and the original shape of the grinding surface are continuously maintained stay.
  • the guide pin carrier is movably supported between the drill guide piece and the grinding surface and is loaded by means of a spring in the direction of the grinding surface and that at least one grinding wheel stop made of a material which is harder is attached to the guide pin carrier is attached as the grinding wheel, for example made of hard metal, which has a stop surface parallel to the grinding surface and acting on it, which limits the spring travel of the guide pin carrier in the direction of the grinding wheel.
  • the rotating grinding wheel is not only worn by the drills but also by the grinding wheel stops, the grinding surface repeatedly takes on the shape of the stop surfaces of the grinding wheel stops, which continuously maintains the original shape of the grinding surface and prevents deformation of the grinding surface.
  • this disadvantageous effect of the grinding wheel stops on the grinding effect of the grinding wheel can be largely prevented.
  • the grinding surface and the abutment surface of the grinding wheel stop in the radial direction can be expanded beyond what is necessary for grinding the largest drill that can be ground in the device, the dimensions of these extensions and the force of the spring being matched to one another such that the between these extensions resulting pressure is less than the average grinding pressure to be expected between the relief surface of a drill and the grinding surface. It should be mentioned that the grinding pressure is applied by hand and that the wear on the grinding wheel increases with increasing pressure.
  • the feature just described fulfills its task best or comes to its fullest effect if, starting from a device in which the grinding surface is conical and the guide channels extend at least approximately parallel to the drive axis of the grinding wheel and at least approximately touch a cylinder jacket coaxial with the drive axis ,
  • the cylinder jacket with an internally conical grinding surface as known per se, lies outside and with an outside conical grinding surface within the guide channels.
  • any distance between the guide pin and the grinding surface can be set, which is between the shortest distance at which the grinding wheel stop lies against the grinding surface and the greatest distance at which the guide pin carrier strikes against the drill guide piece.
  • the positions of the undercut surfaces of the drill with respect to the grinding surface can be changed within a wide range and consequently different undercut angles of the main cutting edges can be achieved.
  • carbide is generally used as the material for the grinding wheel stops. The wear of hard metal when using the usual aluminum oxide disks for grinding drills of the type is ver negligible low.
  • Other materials can also be used for the grinding wheel stops, for example polycrystalline diamond (multi-grain diamond) or cubic boron nitride (CBN).
  • polycrystalline diamond multi-grain diamond
  • CBN cubic boron nitride
  • FIG. 1 shows a longitudinal section in plane II 'in FIG. 2 through an exemplary embodiment of a drill grinding device according to the invention
  • FIG. 2 shows a view of the guide pin carrier and the drill guide piece, seen in the direction of arrow A in FIG. 1
  • 3 shows a pair of guide pins on a larger scale
  • FIGS. 4 and 5 show larger sections through the drill guide piece, the guide pin carrier and the grinding wheel in the area of the largest and the smallest guide channel
  • FIG. 6 shows a section according to FIGS. 4 and 5, but in the area of a 7 on a larger scale
  • FIG. 7 the drill bit tip of a conventional twist drill
  • FIG. 8 the top view of the drill bit according to FIG. 7, and
  • FIG. 9 a longitudinal section similar to FIG. 1 through a second embodiment of the invention.
  • 1 is a drive axle which has a pin 2 which can be clamped in the chuck of a drilling machine, not shown.
  • the grinding wheel 3 is glued to the grinding wheel carrier 5, which is fastened on the drive shaft 1 between the locking ring 6 and the nut 7.
  • the grinding surface 4a of the grinding wheel 3, which is intended to receive the relief surfaces of the drills has an internal conical shape and is expanded towards the outside by an extension 4b which lies in a plane perpendicular to the drive axis 1.
  • the drive axis 1 is mounted in a drill guide piece 9 arranged opposite the grinding surface 4a by means of a ball bearing 8 inserted in a hollow cylinder 9c of the latter.
  • the drill guide piece 9 extend parallel to the drive axis 1 guide channels 15 of different diameters for guiding drills of different diameters to the grinding surface 4a.
  • the guide channels 15 lie within a circle 16 (FIG. 2) tangent to all guide channels, the diameter of which is equal to the outer diameter of the grinding surface 4a and the center of which lies in the grinding wheel axis.
  • a hollow cylinder 9a on the drill guide piece 9 surrounds the grinding wheel 3.
  • 9b denotes a handle formed on the drill guide piece 9.
  • a retaining ring 10 is fastened in a groove on the outer wall of the hollow cylinder 9c of the drill guide piece 9.
  • Two rigidly connected and substantially annular plates 11 and 12 form a guide pin carrier.
  • the plate 11 has bores 17 aligned with the guide channels 15, the diameter of which is equal to the diameter of the corresponding guide channel.
  • the plate 12 has openings 18 aligned with the bores 17, into each of which two guide pins 20 (FIG. 3) for engagement in the flutes 19 (FIG. 8) of a drill protrude.
  • Each guide pin 20 has two stop edges 21 which limit rotation of a drill inserted into the corresponding guide channel and between the guide pins 20 to the right and left.
  • Two diametrically opposed and outwardly projecting projections 22 on the guide pin carrier 11, 12 extend into corresponding recesses 23 in the hollow cylinder 9a and serve for exact alignment of the guide pin carrier 11, 12 with the drill guide piece 9.
  • the axially movable guide pin carrier 11, 12 is mounted between the latter essentially cylindrical periphery and an inner cylindrical surface 9d on the drill guide piece 9.
  • Three grinding wheel stops 13 made of hard metal are soldered to the grinding wheel side on the grinding wheel side, along the grinding surface 4a. You have one each with the grinding Surface 4a parallel stop surface 24a and an extension 24b of this stop surface, which runs parallel to the extension 4b of the grinding surface 4a.
  • the drill receives a central grinding within practically usable limits, sufficient relief grinding 27 (FIG. 7) and both a suitable relief grinding angle j / (FIG. 7) and a suitable cross cutting angle (Fig. 8). If a larger relief, etc. is desired, the drill is ground in the next closest matching guide channel 15.
  • the part of the grinding surface 4a touched by the drill is worn by the drill and at least the part not touched by the drill is worn by the grinding wheel stops 13. This prevents the grinding surface from being deformed. However, the part touched by the grinding wheel stops is also blunted and loses part of its grinding effect.
  • the grinding surface 4a has a total width 28 (FIG. 4) of 5 mm. Since it can be assumed that drills of different diameters are ground in the device, a strip approximately 2.5 mm wide is sharp. Since this sharp strip lies in the outer area of the grinding surface 4a, due to the special geometry of twist drills, even with a 10 mm drill, about two thirds of the entire relief surface is already in this sharp area.
  • the spring 14 constantly presses the guide pin carrier 11, 12 with its grinding wheel stops 13 against the grinding surface 4a. Consequently, despite wear of the grinding wheel, the distance between the guide pin 20 and the grinding surface 4a remains at least largely constant. Drills can thus be ground with a largely identical grinding result until the guide pin carrier 11, 12 strikes the locking ring 10. Then the grinding wheel must be replaced.
  • FIG. 9 has an annular stop 28 'which is provided with an external thread which engages adjustably in an internal thread arranged on the hollow cylinder 9a' of the drill guide piece 9 '. All other parts of this embodiment are identical to the previously described embodiment.
  • the guide pin carrier 11 ', 12' abuts against the upper edge of the stop 28 '.
  • the guide pin carrier 11 ', 12' can move from an end position in which the grinding wheel stops 13 'bear against the grinding surface 4a' to the other end position in which the guide pin carrier 11 ', 12' strikes against the drill guide piece 9 ', are moved axially.
  • the position of the relief surfaces of the drills in relation to the grinding surface depends on the distance between the guide pins and the grinding surface. Consequently, in a device according to FIG. 9, the positions of the relief surfaces of the drills can be changed within a range corresponding to the distance between the end positions of the guide pin carrier 11 ', 12', and different sizes of relief grinding 27, relief grinding angle and transverse ⁇ cutting angle ⁇ e can be achieved.
  • the exemplary embodiments described are designed as additional devices for hand drilling machines.
  • An exemplary embodiment according to the invention could also be designed as an autonomous unit with a built-in motor.
  • a satisfactory effect of the specific features of the invention taking into account both the grinding action of the wheel on the drill and the action of the grinding wheel stops on the grinding surface, should be achieved at a working speed of the grinding surface of about 3 to 30 m / s, the optimal effect is about 20 m / s.
  • the optimal effect is about 20 m / s.
  • an outer diameter of the grinding wheel of approximately 80 mm, this corresponds to approximately 700 rpm to 7000 rpm or 5000 rpm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Drilling Tools (AREA)
  • Earth Drilling (AREA)
EP85890035A 1984-02-14 1985-02-13 Dispositif pour l'affûtage de forets hélicoidaux Expired EP0152400B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0046484A AT380419B (de) 1984-02-14 1984-02-14 Einrichtung zum schleifen von spiralbohrern
AT464/84 1984-02-14

Publications (3)

Publication Number Publication Date
EP0152400A2 true EP0152400A2 (fr) 1985-08-21
EP0152400A3 EP0152400A3 (en) 1986-12-30
EP0152400B1 EP0152400B1 (fr) 1988-05-11

Family

ID=3491313

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85890035A Expired EP0152400B1 (fr) 1984-02-14 1985-02-13 Dispositif pour l'affûtage de forets hélicoidaux

Country Status (7)

Country Link
US (1) US4574529A (fr)
EP (1) EP0152400B1 (fr)
JP (1) JPS60180757A (fr)
AT (2) AT380419B (fr)
CA (1) CA1233988A (fr)
DE (1) DE3562578D1 (fr)
ES (1) ES8601748A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0489410A1 (fr) * 1990-12-03 1992-06-10 Folke Werner Dispositif pour l'affûtage de forets

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT385703B (de) * 1986-07-07 1988-05-10 Wurscher Raimund Einrichtung zum schleifen von spiralbohrern
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
US9855966B2 (en) * 2012-11-20 2018-01-02 Glenn S. Welch Sharpening tool, sharpening system and kit
CN102974872A (zh) * 2012-12-19 2013-03-20 南通第五机床有限公司 一种钻床用立卧转换钻头
CN112507523B (zh) * 2020-11-16 2024-05-17 深圳数马电子技术有限公司 一种麻花钻模型的建立方法以及装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2800755A (en) * 1955-03-14 1957-07-30 Joseph D Perra Drill sharpener
DE2042014A1 (de) * 1969-10-07 1971-04-22 Wurscher Raimund Dr Phil Einrichtung zum Schleifen von Bohrern
DE1959470A1 (de) * 1969-11-27 1971-07-22 Wurscher Raimund August Einrichtung zum Schleifen von Bohrern
FR2242853A5 (en) * 1973-08-28 1975-03-28 Bosch Gmbh Robert Drill grinder with guide body - fixed guide pins engaging drill flutes screw adjusted towards grinding wheel

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE325210B (fr) * 1967-05-03 1970-06-22 R Wurscher
US3742652A (en) * 1970-03-06 1973-07-03 Black & Decker Mfg Co Drill sharpener
US4016680A (en) * 1974-04-01 1977-04-12 The Black And Decker Manufacturing Company Sharpener for twist drills including grinding wheel dressing means

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2800755A (en) * 1955-03-14 1957-07-30 Joseph D Perra Drill sharpener
DE2042014A1 (de) * 1969-10-07 1971-04-22 Wurscher Raimund Dr Phil Einrichtung zum Schleifen von Bohrern
DE1959470A1 (de) * 1969-11-27 1971-07-22 Wurscher Raimund August Einrichtung zum Schleifen von Bohrern
FR2242853A5 (en) * 1973-08-28 1975-03-28 Bosch Gmbh Robert Drill grinder with guide body - fixed guide pins engaging drill flutes screw adjusted towards grinding wheel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0489410A1 (fr) * 1990-12-03 1992-06-10 Folke Werner Dispositif pour l'affûtage de forets

Also Published As

Publication number Publication date
AT380419B (de) 1986-05-26
CA1233988A (fr) 1988-03-15
US4574529A (en) 1986-03-11
DE3562578D1 (en) 1988-06-16
ATE34113T1 (de) 1988-05-15
ATA46484A (de) 1985-10-15
ES540321A0 (es) 1985-11-16
EP0152400A3 (en) 1986-12-30
EP0152400B1 (fr) 1988-05-11
JPS60180757A (ja) 1985-09-14
JPS6236827B2 (fr) 1987-08-10
ES8601748A1 (es) 1985-11-16

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