EP0234396A2 - Dispositif d'affûtage des forets - Google Patents

Dispositif d'affûtage des forets Download PDF

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Publication number
EP0234396A2
EP0234396A2 EP87101801A EP87101801A EP0234396A2 EP 0234396 A2 EP0234396 A2 EP 0234396A2 EP 87101801 A EP87101801 A EP 87101801A EP 87101801 A EP87101801 A EP 87101801A EP 0234396 A2 EP0234396 A2 EP 0234396A2
Authority
EP
European Patent Office
Prior art keywords
clamping
drill
prism
axis
stops
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Withdrawn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
EP87101801A
Other languages
German (de)
English (en)
Other versions
EP0234396A3 (fr
Inventor
Albert Hammedinger
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 EP0234396A2 publication Critical patent/EP0234396A2/fr
Publication of EP0234396A3 publication Critical patent/EP0234396A3/fr
Withdrawn legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/24Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills
    • B24B3/26Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills of the point of twist drills
    • B24B3/28Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills of the point of twist drills by swivelling the drill around an axis angularly to the drill axis

Definitions

  • the invention relates to a device for sharpening twist drills or the like.
  • a rotatably driven grinding wheel and a clamping element for the drill which can be pivoted about a pivot axis running at right angles to the drill axis and parallel to the grinding plane.
  • DE-A 33 07 935 describes and shows a clamping head for a drill grinding machine in which the swivel axis lies in front of the grinding plane of the grinding wheel facing the drill and within the drill itself.
  • the clamping head To carry out surface grinding, the clamping head must be moved with the drill against the grinding surface of the grinding wheel. Since the pivot axis lies within the drill, this must be carried out before carrying out the second surface grinding, i.e. H. be retracted in the direction of the drill axis before swiveling the chucking head around the swiveling axis in order to place it again against the grinding surface after swiveling the chucking head by the tip angle. Regrinding the drill tip by removing chips is only possible if the drill is moved continuously towards the grinding surface in the direction of its drill axis.
  • the known clamping head not only has a complicated structure, but is also cumbersome to use due to the described mode of operation and not sufficiently precise.
  • a similar device for grinding drills and drill cutters is the subject of DE-C 1 152 636.
  • the drill is clamped in a headstock which is rotatable about a horizontal longitudinal axis, pivotable about a horizontal transverse axis and pivotable about a vertical axis.
  • the vertical axis lies in the grinding plane.
  • this known device for the production of a surface grinding at the tip of the drill after the respective pivoting around The vertical axis can be moved in the direction of its longitudinal axis against the grinding plane.
  • the invention has for its object to provide a device for sharpening twist drills o.
  • the like That is so simple that an exact two-surface grinding or four-surface grinding can be carried out on the drill tip in just a few steps, without the There is a need to move the drill in its axial direction before or after swiveling by the tip angle.
  • this object is achieved according to the invention in that the pivot axis of the clamping member lies at a distance below the grinding plane of the grinding wheel with respect to the tip of the drill.
  • the distance of the swivel axis from the grinding plane is preferably a few millimeters, preferably 2 to mm.
  • the pivot axis of the clamping member is not in front of or on the drill tip, as is the case in the prior art described above, but in front of the drill tip and below the grinding plane, both the tip angle are by a single pivoting movement of the clamping member of the drill and the dimension to be ground for the surface grinding at the tip of the drill.
  • This device can be used to produce a sufficiently precise two-face grinding on the drill tip. If a four-surface grinding is desired for larger drills, it is sufficient to turn the drill by a small amount in the clamping element after completion of the two-surface grinding, in order to then complete the four-surface grinding by creating the clearance angle.
  • stops are provided on both sides to limit the pivoting angle of the clamping member.
  • These stops can be attached to a holding member that is adjustable in the axial direction of the grinding wheel, so that the swivel angle can be adjusted by simply moving the holding member in the axial direction.
  • stops consist of stop bolts which can be rotated about an eccentric axis, so that a fine adjustment of the pivoting angle is possible.
  • two pairs of stops can also be provided for two different swivel angles, of which the stop pair can be brought into an inoperative position for the smaller swivel angle.
  • the stop pair can be pivoted away for the smaller swivel angle, in order to then complete the four-surface grinding by swiveling in the second stop pair.
  • the clamping member has at least one holding bar that can be pivoted about the pivot axis for fixing the drill. It is advantageous if spacer elements can be placed on the retaining strip in the area striking the stops. These spacer elements can consist of U-shaped plastic brackets, by means of which the swivel angle is reduced after being placed on the holding bar.
  • two diametrically opposite retaining strips are fastened to a swivel ring which can be swiveled about the swivel axis and which surrounds the grinding wheel at a distance from its circumference.
  • the clamping element has at least one clamping prism for the drill.
  • a clamping prism for the drill should be detachably fastened to each holding bar in order to be able to first set the exact angular position of the drill on the clamping prism before it is then fastened to the holding bar together with the drill.
  • the clamping prism is connected on its rear side facing away from the drill to a cross-sectionally U-shaped rail which can be placed on the retaining bar and clamped thereon.
  • the clamping prism In order to be able to adjust the clamping prism relative to the rail in this embodiment, it is attached to the rear of the rail by clamping screws. After loosening the clamping screws, the clamping prism can then be adjusted to compensate for manufacturing tolerances of the device and to be able to adjust the drill axis so that it intersects the swivel axis.
  • adjusting screws are screwed into the rail relative to the clamping prism in the direction of displacement of the rail, which are supported in pairs diagonally opposite each other approximately tangentially on a clamping screw.
  • a clamping ring with a clamping screw for fixing the drill is placed on each clamping prism.
  • the drill is fixed in the angular position required for the surface grinding to be attached, so that the clamping prism can then be attached to the holding strip with the drill.
  • Marking lines are attached to the underside of each clamping prism to adjust the main cutting edge at the drill tip.
  • Figure 1 shows the principle of operation of the device designed according to the invention for regrinding the tip of a drill 10. To attach a two-surface grinding, this is first, as shown in dash-dotted lines, moved in a vertical position against a grinding wheel 12 with a vertical axis 14 such that its drill tip grinds the grinding plane 16 Touches grinding wheel 12. The drill 10 is fixed in a clamping prism 18 shown schematically in FIG. 2.
  • the clamping prism 18 and with it the drill 10 are then rotated about a pivot axis 20 which is at a distance a of preferably 2 to 3 mm below the grinding plane 16.
  • This pivoting of the drill 10 by the pivot angle denoted by beta is limited by two stops 22 which are arranged at the same distance on both sides of the axis 14.
  • FIG. 2 shows the two ground surfaces 24 with the respective main cutting edge 26 and the transverse cutting edge 28.
  • the drill 10 In order to produce an exact two-surface grinding, the drill 10 must be fixed to the clamping prism 18 in accordance with FIG. 2 such that the main cutting edge 26 runs parallel to a prism surface 30.
  • two-face grinding is generally not sufficient; it is therefore necessary to apply a four-surface grinding in order to produce a undercut 32 and thus a clearance angle on the main cutting edges 26.
  • the drill tip must have a distance from the grinding plane 16 after completion of the two-face grinding in the starting position shown in dash-dotted lines in FIG.
  • the drill must be rotated in the clamping prism 16 in order to produce the relief grinding 32 until the main cutting edge 26 is aligned with a marking line 34 corresponding to the drill diameter.
  • a plurality of marking lines 34 are attached to the underside of the clamping prism 18 and are assigned to different drill diameters.
  • the drill 10 After the drill 10 is fixed to the clamping prism 18 in the manner described, it is pivoted again into two end positions, the pivot angle however being smaller than the pivot angle Beta for the first two-surface grinding.
  • the stops 22 For this purpose, the stops 22 must be changed, which will be discussed in more detail below.
  • FIGS 3-6 show a first embodiment of a device according to the invention.
  • the grinding wheel 12 is accommodated with a drive motor, not shown, which can be switched on and off by a push button 26, in a cylindrical housing 38 which has a flat foot 40.
  • the upper part of the housing 38 which is open at the top, is box-shaped and has flat boundary walls 42.
  • Two mutually opposite boundary walls 42 each carry a bearing 44 for a pivot pin 46, by which the pivot axis 20 is defined.
  • the two pivot pins 44 are connected to each other by a pivot ring 48, which the Grips grinding wheel 12 at a distance from its circumference.
  • a holding strip 50 is fastened, which extends straight up and down from the pivot pin 46.
  • Each retaining strip 50 carries a clamping prism 18 at its upper end.
  • the clamping prism 18 has a U-shaped rail 52 on its rear side facing away from the drill 10, the legs 54 of which have a distance from one another which corresponds to the width of the retaining strip 50. This allows the rail 52 and with it the prism 18 to be placed on the retaining bar 50 without play.
  • FIGS 3, 5 and 6 show that a U-shaped clamp 56 is fastened to each clamping prism 18, for example by a pin 58, and that the clamp 56 carries a locking screw 60.
  • the locking screw 60 is tightened so that its tip presses against the holding bar 50. It is essential that the retaining strip 50 is flatter than the height of the two legs 54 of the rail 52.
  • a clamping ring 62 with a rectangular cross section is placed on the clamping prism 18 and carries a clamping screw 64.
  • the tip of the clamping screw 64 is rotatably fastened in a pressure plate 66 which is supported against the free ends of the legs 54 of the U-shaped rail 52.
  • the clamping screw 64 is tightened so that the clamping ring 62 clamps the drill 10 in the clamping prism 18.
  • the clamping prism 18 with the drill 10 fixed therein can then be placed on the holding strip 50 and pushed up to the desired distance of the drill tip from the grinding plane 16. Only now is that Locking screw 60 is tightened so that the unit drill 10 - clamping prism 18 is fixed to the retaining bar 50.
  • the drill 10 For the production of a four-surface grinding, the drill 10 must be rotated by a few degrees, which has been discussed in detail at the beginning. For this purpose, only the locking screw 60 has to be loosened so that the clamping prism 18 can be removed from the holding strip 50. Then the drill 10 is brought into its new angular position by loosening the clamping screw 64.
  • stops 22 are attached to the boundary wall 42 of the housing.
  • Figure 6 shows that a lower pair of stops 22 and an upper pair of stops 22 'are provided, the upper pair of stops 22' defines the pivot angle Beta for a two-surface grinding, while the lower pair of stops 22 serves for a larger pivot angle when the clearance angle is made for a four-surface grinding shall be.
  • the two lower stops 22 are each fastened to a folding arm 68 which can be pivoted downward about a horizontal folding axis 70 into an inoperative position of the two stops 22. This process is indicated by an arrow in FIG. 5.
  • stops 22 are assigned to each retaining strip 50. These consist of cylindrical stop bolts which are rotatable about an eccentric axis, not shown. This allows fine adjustment of the stops 22.
  • a half-shell 72 For the rough adjustment of the two stops 22, these are attached to a half-shell 72, the outside 74 of which is flat, while its partially cylindrical inside abuts the cylindrical inner housing 38.
  • the stops 22 for the opposite retaining strip 50 are also attached to such a half-shell 72.
  • Both half-shells 72 can be clamped against one another by screw bolts 76 and thus against the cylindrical wall of the housing 38. After loosening the bolts 76, the two half-shells 72 can be adjusted together in the vertical direction, as a result of which the swivel angle Beta of the two retaining strips 50 is also changed.
  • a guide bar 78 which is attached to the outside of the housing 38 and engages in the gap between the two half-shells 72, serves for the vertical guidance of the two half-shells 72.
  • a U-shaped spacer 80 must be placed on the lower end of the retaining bar 50 to reduce the swivel angle beta for the production of a four-surface grinding, which spacer 80 is pivoted when the retaining bar is pivoted 50 strikes at the two stops 22.
  • FIGS. 8-11 show a modified embodiment of a clamping prism 18, which is adjustably attached to the U-shaped rail 52 with its rear side facing away from the prism surfaces 30.
  • Two clamping screws 82 are used for fastening, the threaded shaft of which is screwed into a threaded bore 84 of the clamping prism 18 and passes through the corresponding bore in the rail 52 with radial play.
  • the clamping prism 18 can be adjusted relative to the rail 52 in order to compensate for manufacturing tolerances of the device and to bring the axis of the drill 10 into such a position that it intersects the pivot axis 20.
  • the clamping prism 18 In order to be able to carry out this fine adjustment of the clamping prism 18 relative to the rail 52 without any problems, the latter has two threaded bores running at right angles to the axis of the clamping screw 82, into each of which an adjusting screw 86 is screwed. The opposite ends of the two adjusting screws 86 are supported approximately tangentially on the clamping screw 82. By screwing in or unscrewing the two adjusting screws 86, the rail 52 can be adjusted at right angles to the axis of the clamping screws 82 on the rear side of the clamping prism 18. After setting the exact position of the clamping prism 18, the two clamping screws 82 are tightened again.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP87101801A 1986-02-13 1987-02-10 Dispositif d'affûtage des forets Withdrawn EP0234396A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863604536 DE3604536C1 (de) 1986-02-13 1986-02-13 Bohrerschaerfvorrichtung
DE3604536 1986-02-13

Publications (2)

Publication Number Publication Date
EP0234396A2 true EP0234396A2 (fr) 1987-09-02
EP0234396A3 EP0234396A3 (fr) 1988-11-23

Family

ID=6294026

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87101801A Withdrawn EP0234396A3 (fr) 1986-02-13 1987-02-10 Dispositif d'affûtage des forets

Country Status (2)

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EP (1) EP0234396A3 (fr)
DE (1) DE3604536C1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1695793A1 (fr) * 2005-02-25 2006-08-30 Rollomatic S.A. Machine transfert pour la production de mèches ou forets

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1138018A (fr) * 1955-12-06 1957-06-06 Procédé et appareil d'affûtage des forets
US2829473A (en) * 1957-05-24 1958-04-08 Maurice J Pruner Drill bit grinder
DE3307935A1 (de) * 1982-03-09 1983-10-06 Gottstein Fritz Einspannkopf fuer eine bohrer-schleifmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1138018A (fr) * 1955-12-06 1957-06-06 Procédé et appareil d'affûtage des forets
US2829473A (en) * 1957-05-24 1958-04-08 Maurice J Pruner Drill bit grinder
DE3307935A1 (de) * 1982-03-09 1983-10-06 Gottstein Fritz Einspannkopf fuer eine bohrer-schleifmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1695793A1 (fr) * 2005-02-25 2006-08-30 Rollomatic S.A. Machine transfert pour la production de mèches ou forets
WO2006089444A1 (fr) * 2005-02-25 2006-08-31 Rollomatic Sa Machine transfert pour la production de mèches ou forets

Also Published As

Publication number Publication date
DE3604536C1 (de) 1987-08-20
EP0234396A3 (fr) 1988-11-23

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