EP0143870A1 - Dispositif auxiliaire pour l'affûtage de forets hélicoidaux - Google Patents

Dispositif auxiliaire pour l'affûtage de forets hélicoidaux Download PDF

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Publication number
EP0143870A1
EP0143870A1 EP84103750A EP84103750A EP0143870A1 EP 0143870 A1 EP0143870 A1 EP 0143870A1 EP 84103750 A EP84103750 A EP 84103750A EP 84103750 A EP84103750 A EP 84103750A EP 0143870 A1 EP0143870 A1 EP 0143870A1
Authority
EP
European Patent Office
Prior art keywords
drill
auxiliary device
main cutting
cutting edge
polyhedron body
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
EP84103750A
Other languages
German (de)
English (en)
Other versions
EP0143870B1 (fr
Inventor
Robert Wolff
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
Priority to AT84103750T priority Critical patent/ATE31655T1/de
Publication of EP0143870A1 publication Critical patent/EP0143870A1/fr
Application granted granted Critical
Publication of EP0143870B1 publication Critical patent/EP0143870B1/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
    • B24B3/247—Supports for drills

Definitions

  • the invention relates to an auxiliary device for regrinding twist drills, with a receiving channel for the twist drill to be set against a grinding wheel.
  • the invention has for its object to provide an inexpensive auxiliary device for regrinding twist drills, which is easy and safe to use and allows exact regrinding.
  • the auxiliary device consists of a handheld polyhedron body which can be clamped onto the twist drill and which has at the outlet end for the drill tip a visible edge running parallel to a drill main cutting edge, which is several times longer than the main cutting edge, and its bearing surface on one Grinding table or the like. Trained bottom is inclined by the clearance angle of the main cutting edge with respect to the drill axis.
  • the long visible edge of the auxiliary device enables such a good orientation that using the lower contact surface also ensures that the exact tip angle is not a problem.
  • the underside of the auxiliary device which is designed as a support surface, automatically ensures, due to its inclination, that the clearance angle is independent of the Dexterity and the sense of proportion of the user is precisely adjusted at all times. Because of its construction from only a few parts, such an auxiliary device can be manufactured extremely inexpensively.
  • the polyhedron body at the outlet end for the drill tip can be tapered roof-shaped with the tip angle of the drill and both its underside and its top surface can be designed as contact surfaces inclined to the drill axis by the clearance angle.
  • the polyhedron body can consist of two clamping jaws, essentially divided along the drill receiving channel. This split design of the polyhedron body saves a separate, complex clamping device for the drill, which is advantageous in terms of both manufacture and handling.
  • one of the clamping jaws can have a screwing pin which engages in the other clamping jaws and is provided with a threaded bore and which is provided with a passage for the drill.
  • the clamping screw can be accessible from the side area of the auxiliary device for clamping the two clamping jaws together. Since this side area does not come into contact with the grinding table, grinding wheel or the like, the screw head can be designed as an easy-to-use rotary handle. The top and bottom can be retained as full contact areas.
  • the two clamping jaws can be provided with positively interlocking guide lugs and associated receptacles.
  • these guide lugs and receptacles ensure exact guidance of the two polyhedron halves to one another, so that the flatness, i. H. the tilting freedom of the auxiliary device, the contact surfaces is guaranteed.
  • Such guide devices are necessary because the spiral shape of the secondary cutting edges can result in a slight displacement of the two clamping jaws against one another when clamping a drill.
  • the polyhedron body can be in one piece and have a transverse channel for a clamping screw opening into the drill receiving channel.
  • This embodiment variant is particularly favorable in terms of production.
  • the locking screw should be made of soft metal or plastic.
  • the side surfaces of the polyhedron body can be designed as contact surfaces for a guide stop on the grinding table side.
  • the formation of the side surfaces as contact surfaces for a guide stop is advantageous when extreme demands are placed on the accuracy of the tip angle, and especially when a large number of drills are to be reground. In the latter case, a single alignment of the guide stop on the grinding table side is sufficient to always achieve an exact tip angle.
  • Fig. 1 shows an auxiliary device 1 with an inserted drill 2, which rests on a grinding table 3.
  • the drill tip 4 is placed on the peripheral surface of a grinding wheel 5.
  • the auxiliary device 1 is designed as a polyhedron body 6 and consists of two clamping jaws 7, 8.
  • the end faces 9, 10 of the clamping jaws 7, 8 lying at the outlet end 11 for the drill tip 4 are chamfered and form visible edges 12, 13, which each run parallel to one of the two main cutting edges 14, 15.
  • the visible edges 12, 13 are chamfered so that the drill axis 16 is brought to the grinding wheel 5 at an angle ⁇ of 30 °. This results in a usual tip angle ⁇ at the drill tip 4 of 120 °; see also FIG. 5.
  • auxiliary device 1 shows the auxiliary device 1, the underside 18 of which is designed as a supporting surface 17 and which rests on the grinding table 3.
  • the bearing surface 17 is inclined by the clearance angle 8 with respect to the drill axis 16, so that the main cutting edge 14 (not visible here) is given a corresponding clearance angle ⁇ .
  • the clearance angle ⁇ has a common size of 6 °; in principle, other clearance angles are also conceivable for special cases such as hard metal cutting or the like.
  • the top side 19 of the auxiliary device 1 is also designed as a support surface 20 and is inclined in the same way by the clearance angle y with respect to the drill axis 16. To grind the main cutting edge 15, it is therefore sufficient to turn the auxiliary device 1 through 180 ° and now to align it with the visible edge 12.
  • the exact clamping of the drill 2 in the auxiliary device 1 is facilitated by markings 21, on which the main cutting edges 14, 15 are aligned and thus receive a horizontal orientation.
  • the drill 2 in the two-part embodiment of the auxiliary device 1 is inserted into a receiving channel 22, which is formed from two V-grooves 23, 24, each of which is assigned to a clamping jaw 7, 8.
  • the clamping jaw 7 has a threaded bore 25 provided with a Verschraubungsza p fen 26 which is provided with a passage 27 for the drill. 2
  • the drill 2 can now be clamped in the receiving channel 22 via the clamping screw 28. Since the tensioning screw 28 can be operated from the side surface 29, the head of the tensioning screw 28 can be designed as a hand turning handle 30.
  • the clamping jaws 8 is provided with a receptacle 31 for the screw pin 26 designed as a guide projection 32, so that the two clamping jaws 7, 8 cannot move against one another.
  • the auxiliary device 1 made of a soft material such. B. plastic
  • auxiliary device 37 which is designed as a one-piece polyhedron body 38.
  • the drill 2 is here in a receiving channel 39 with a diamond-shaped cross section and is tightened by a clamping screw 40 which is screwed into a transverse channel 41. Otherwise, the same geometric conditions apply to the polyhedron body 38 as for the polyhedron body 6.
  • the auxiliary device 37 it is otherwise irrelevant if the drill axis 16 is somewhat off-center in the case of smaller or larger drill diameters, since this results in the geometric orientation specifications by the polyhedron body 38 do not change.
  • FIG. 5 shows a drill tip 4 with the main cutting edges 14, 15 and the spiral auxiliary cutting edges 50, 51.
  • the main cutting edges 14, 15 together form the tip angle ⁇ .
  • a free surface 52 can be seen behind the main cutting edge 15, as is created by grinding at the clearance angle t. While with a drill with a diameter of less than 6 mm, simple grinding under the clearance angle ⁇ is sufficient, for larger drill diameters it is advantageous to provide an additional relief surface 53.
  • This relief surface 53 can also be produced with the auxiliary devices 1 and 37 without any problems.
  • the drill 2 is then rotated in the receiving channel 22 or 39 in the arrow direction 54 shown in FIG. 2 by approximately 15 ° , so that the orientation of the main cutting edges 14, 15 no longer coincides with the markings 21.
  • the relief grinding surface 53 is then created by lightly grinding again.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Drilling Tools (AREA)
EP84103750A 1983-10-27 1984-04-05 Dispositif auxiliaire pour l'affûtage de forets hélicoidaux Expired EP0143870B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84103750T ATE31655T1 (de) 1983-10-27 1984-04-05 Hilfsgeraet zum nachschleifen von spiralbohrern.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833338910 DE3338910A1 (de) 1983-10-27 1983-10-27 Hilfsgeraet zum nachschleifen von spiralbohrern
DE3338910 1983-10-27

Publications (2)

Publication Number Publication Date
EP0143870A1 true EP0143870A1 (fr) 1985-06-12
EP0143870B1 EP0143870B1 (fr) 1988-01-07

Family

ID=6212809

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84103750A Expired EP0143870B1 (fr) 1983-10-27 1984-04-05 Dispositif auxiliaire pour l'affûtage de forets hélicoidaux

Country Status (5)

Country Link
US (1) US4566227A (fr)
EP (1) EP0143870B1 (fr)
JP (1) JPS6094261A (fr)
AT (1) ATE31655T1 (fr)
DE (2) DE3338910A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102099154A (zh) * 2008-06-26 2011-06-15 Tj开发公司 用于磨锐螺旋钻尖端的装置以及其使用方法

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4638603A (en) * 1986-01-29 1987-01-27 Hanson Harvey E Device for sharpening single-flute countersinks
US4974372A (en) * 1989-04-12 1990-12-04 Chantalat Vinit P Universal device for sharpening drill bits
US20050053439A1 (en) * 2003-09-09 2005-03-10 Yuhong Wang Two-flute twist drill
CN102756307A (zh) * 2012-07-31 2012-10-31 长城汽车股份有限公司 修磨复杂刀具的方法及砂轮
US8439727B1 (en) * 2012-08-06 2013-05-14 Leo F. Woodard Drill bit sharpening tool
CN112893750A (zh) * 2021-01-14 2021-06-04 任洪胜 一种五金件胚料加工自动锻造成型机

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2595950A (en) * 1949-05-20 1952-05-06 William C Keebler Tool bit grinding fixture
GB678057A (en) * 1950-06-06 1952-08-27 Leonard Cosens Improvements in or relating to jigs for the grinding of lathe and like cutting tools
US2821820A (en) * 1956-03-05 1958-02-04 Wesley W Thumann Guide for sharpening drill bits
US3169353A (en) * 1961-11-17 1965-02-16 Lester S Krulwich Drill grinding apparatus
US3373530A (en) * 1965-07-30 1968-03-19 Clyde E. Cooprider Sharpening fixture for twist drills
EP0028413A1 (fr) * 1979-11-06 1981-05-13 Hawera Probst GmbH + Co. Accessoire pour le meulage
EP0080093A2 (fr) * 1981-11-25 1983-06-01 Reinhold Reiling Support de forets pour l'affûtage des arêtes tranchantes

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US388784A (en) * 1888-08-28 mossbeeg
US201449A (en) * 1878-03-19 Improvement in drill-grinders
GB575664A (en) * 1943-03-01 1946-02-27 Robert Howard Clark Fixture for grinding thread cutting tools
GB563546A (en) * 1943-03-18 1944-08-18 Charles Crofton And Company En Improvements relating to jigs for use in grinding drill bits
US2408544A (en) * 1945-01-01 1946-10-01 Banner Joseph Twist drill sharpener
US2730849A (en) * 1952-09-20 1956-01-17 James V Novak Drill bit grinding fixtures
US3121983A (en) * 1959-02-05 1964-02-25 Harvey W English Drill grinding attachment
US3932964A (en) * 1971-12-13 1976-01-20 James B. Simms Multi-angle grinding fixture
DE2445453C2 (de) * 1974-09-24 1985-06-13 Robert Bosch Gmbh, 7000 Stuttgart Bohrerschleifeinrichtung
DE2456173A1 (de) * 1974-11-28 1976-08-12 Wolfcraft Robert Wolff Kg Hilfsvorrichtung fuer ein nachschleifen von bohrern
US3961450A (en) * 1975-02-10 1976-06-08 Kenneth Kay Knaell Twist drill sharpening apparatus
DE2632034C2 (de) * 1976-07-16 1986-07-31 Robert 5446 Engeln Wolff Hilfsvorrichtung zur Erleichterung des Nachschleifens von Spiralbohrern

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2595950A (en) * 1949-05-20 1952-05-06 William C Keebler Tool bit grinding fixture
GB678057A (en) * 1950-06-06 1952-08-27 Leonard Cosens Improvements in or relating to jigs for the grinding of lathe and like cutting tools
US2821820A (en) * 1956-03-05 1958-02-04 Wesley W Thumann Guide for sharpening drill bits
US3169353A (en) * 1961-11-17 1965-02-16 Lester S Krulwich Drill grinding apparatus
US3373530A (en) * 1965-07-30 1968-03-19 Clyde E. Cooprider Sharpening fixture for twist drills
EP0028413A1 (fr) * 1979-11-06 1981-05-13 Hawera Probst GmbH + Co. Accessoire pour le meulage
EP0080093A2 (fr) * 1981-11-25 1983-06-01 Reinhold Reiling Support de forets pour l'affûtage des arêtes tranchantes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102099154A (zh) * 2008-06-26 2011-06-15 Tj开发公司 用于磨锐螺旋钻尖端的装置以及其使用方法
EP2321090A4 (fr) * 2008-06-26 2014-03-05 Tj Utveckling Ab Dispositif d'affûtage d'une pointe de foret hélicoïdal et son procédé d'utilisation
AU2009263039B2 (en) * 2008-06-26 2014-07-10 Tormek Ab A device for sharpening a twist drill point and a method for its use

Also Published As

Publication number Publication date
ATE31655T1 (de) 1988-01-15
DE3468355D1 (en) 1988-02-11
EP0143870B1 (fr) 1988-01-07
US4566227A (en) 1986-01-28
DE3338910A1 (de) 1985-05-09
JPS6094261A (ja) 1985-05-27

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