EP0048031B1 - Procédé et dispositif pour affûter la pointe d'un foret hélicoidal - Google Patents

Procédé et dispositif pour affûter la pointe d'un foret hélicoidal Download PDF

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Publication number
EP0048031B1
EP0048031B1 EP81107335A EP81107335A EP0048031B1 EP 0048031 B1 EP0048031 B1 EP 0048031B1 EP 81107335 A EP81107335 A EP 81107335A EP 81107335 A EP81107335 A EP 81107335A EP 0048031 B1 EP0048031 B1 EP 0048031B1
Authority
EP
European Patent Office
Prior art keywords
drill
grinding wheel
axis
grinding
cutting edge
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
Application number
EP81107335A
Other languages
German (de)
English (en)
Other versions
EP0048031A3 (en
EP0048031A2 (fr
Inventor
Herbert Diener
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.)
Cessione guehring Automation & Co GmbH
Guehring Automation GmbH
Original Assignee
Gottlieb Guehring KG
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 Gottlieb Guehring KG filed Critical Gottlieb Guehring KG
Priority to AT81107335T priority Critical patent/ATE15002T1/de
Publication of EP0048031A2 publication Critical patent/EP0048031A2/fr
Publication of EP0048031A3 publication Critical patent/EP0048031A3/de
Application granted granted Critical
Publication of EP0048031B1 publication Critical patent/EP0048031B1/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

  • a method according to the preamble of claim 1 is known, with which a cylindrical jacket tip grinding of a drill can be produced by a simple translational relative movement between the grinding wheel and the drill axis.
  • the drill bits to be ground are aligned in their holder in a plane that is parallel to the radial plane of the profiled grinding wheel.
  • the translational relative movement between the drill and the grinding wheel takes place in the same plane.
  • the profile of the grinding wheel is formed by a circular sector and thus corresponds to a torus surface section. When the grinding wheel moves past the drill, a cylindrical free surface is ground through this torus surface section.
  • the invention is therefore based on the object of developing the method according to the preamble of claim 1 or the device according to the preamble of claim 4 or of claim 6 such that a high-quality drill bit can be produced while maintaining the simple machining kinematics, the service life of which is compared significantly increased to the values achievable with the known generic method ben is.
  • the process is intended to meet the further boundary condition that it can be transferred to a conventional grinding device for the economical production of high-quality drills both in single and in rotary cycle production processes.
  • the translation movement direction is shifted out of the radial plane of the grinding wheel; however, it remains parallel to the alignment of the main cutting edge.
  • an angle therefore occurs between the direction of translational relative movement and the peripheral speed of the grinding wheel.
  • this also applies to the area of the main cutting edge, so that the grinding marks there run at a certain angle to the cutting edge. This cutting edge becomes more even because there are no more grinding marks that run out at an acute angle to the main cutting edge, which - as can be seen when looking at the main cutting edge under the microscope - produce a cutting edge that is easily "frayed".
  • the steps according to the invention no longer cause excessive stresses which are attributable to the intermediate webs of the grinding grooves which are directly adjacent to the cutting edge.
  • the service life of the drill or drill bit is also increased because the cutting force is no longer given such a large contact surface on the webs between the grinding grooves.
  • the grinding wheel is profiled in such a way that the surface swept by the profile surface during displacement in the direction of translational relative movement forms a lateral surface section of a cylinder.
  • the device according to subclaim 4 enables the application of the new method to the production of drills with rotary transfer machines, which are known within the scope of the preamble of patent claim 4.
  • the blank to be manufactured is clamped firmly in a drill holder and positioned opposite the grinding device.
  • the grinding device is aligned so that the main feed movement of the grinding wheel is essentially parallel to the main cutting edge.
  • the clearance angle can be adjusted by moving the cross support on the longitudinal support, the tip angle by swiveling a support plate.
  • the cross support is delivered by moving the longitudinal support in the axial direction of the drill (regrinding a tip).
  • Fig. 1 shows a drill 1, the tip of which is provided in a conventional manner by means of a cup-shaped grinding wheel 2 with a cylindrical jacket point grinding.
  • the drill 1 is clamped in a holder, not shown, which is mounted in a frame 5 so as to be pivotable about an axis 4 parallel to the grinding wheel radial plane 3.
  • Fig. 1 shows the drill 1 in the position in which its main cutting edge 6 falls in the grinding wheel radial plane 3, i. H. at a moment when the pivoting movement of the drill holder about axis 4 is changing its sign.
  • Half the apex angle d / 2 can be selected by inclining the holder or drill axis 1a to the grinding wheel radial plane 3.
  • a grinding wheel 2 ' can be used, the axis 2a' of the axis 2a of which is pivoted by a certain angle of attack r p about an axis perpendicular to the plane of the drawing in accordance with FIG. 5, so that the grinding grooves then also no longer parallel to the main cutting edge 6, but inclined at an angle r p to it.
  • FIG. 8 shows a grinding wheel 2 'with an elliptical profile 11' in an axial section.
  • the grinding wheel 2 ' rotates about its axis 2a', which is pivoted by an angle of attack ⁇ in the above sense from its orientation perpendicular to the translation-relative movement direction T.
  • the translation-relative movement direction T runs essentially parallel to the plane of the drawing in FIG. 8 and thus parallel to the main cutting edge, as can also be seen in FIG. 9.
  • the 10 and 11 show a device for carrying out both the known grinding method according to DE-OS 2523204 and the new grinding method.
  • This device is particularly suitable when the drill 1 is manufactured in rotary cycle processing machines.
  • the drill 1 is clamped in a drill holder 20 which is mounted on a rotary indexing table 21.
  • the grinding station 22 executing the grinding work cycle has a longitudinal support 23 aligned with the drill holder 20, which can carry out an infeed movement, and a transverse support 24, which can be moved transversely to the longitudinal support 23.
  • the longitudinal support 23 carries a holder 25 which supports the drill tip.
  • a support plate 26 is pivotally mounted in the transverse support 24, the pivot axis Dd of which perpendicularly intersects the extended drill axis 1a.
  • the tip angle ⁇ is set by pivoting the support plate 26.
  • a feed carriage 27 is slidably arranged on the support plate 26, the feed direction representing the above-described relative translational movement direction T.
  • the feed slide 27 carries a grinding wheel holder 28 which is height-adjustable to compensate for the grinding wheel wear and which, in the variant shown in FIG. 10, carries a grinding wheel 2 profiled according to FIGS. 2, 3 and 6, the axis of rotation of which is perpendicular to the drawing plane of FIG. 10.
  • the grinding wheel 2 touches - as viewed in the direction of arrow T - the drill 1 as shown in FIG. 3. When the grinding wheel 2 is moved in the direction of the arrow T, the flank grinding is generated.
  • the clearance angle can be varied by shifting the transverse support 24.
  • the grinding wheel holder 28 is fastened on the feed slide 27 in such a way that it can be pivoted about an axis of rotation D ⁇ which essentially passes through the drill axis and runs perpendicular to the support plate 26 - cf. Fig. 11 -, so a free surface grinding can be generated, the grinding grooves are inclined to the main cutting edge 6 by the adjustable pivoting angle ⁇ .
  • the device shown in FIG. 11 essentially corresponds to the device according to FIG. 10 and represents it viewed in the direction of view parallel to the axis of rotation Dq J.
  • the grinding wheel 2 according to FIG. 10 is replaced by a grinding wheel 2 '.
  • the grinding wheel holder 28 which is pivotally and adjustably mounted on the feed slide 27 and on which the grinding wheel bearing 29 is guided.
  • the grinding wheel holder 28 is - similar to the support plate 26 in Fig. 10 - over a coolie senment 31, immerse in the bolt 32 about the above-mentioned axis of rotation Dq) pivotable.
  • the direction of feed is marked with the arrow T.
  • a motor 30 drives a grinding wheel 2 'profiled according to FIGS. 7 to 9, the axis 2a' of which is pivoted by an angle ⁇ with respect to the position shown in FIG. 10.
  • FIG. 12 shows a further device for carrying out the grinding method described above. It is not the grinding wheel 2 'but the drill holder that carries out the translational relative movement in the direction of the arrow T. This device shown in FIG. 12 can be retrofitted to surface grinding machines with little effort.
  • a machine frame 40 carries a grinding wheel 2 ', so that its grinding wheel axis 2a' is aligned horizontally.
  • a machine bed 41 receives a horizontally aligned support support 42, which via corresponding horizontal guides, for. B. 43 is pivotable and adjustable about a vertical axis.
  • the adjustment support 42 carries a feed slide 44 which can be displaced along the adjustment support 42 by means of a drive unit 45.
  • a drill holder 46 is mounted in the feed carriage 44 so as to be pivotable and adjustable about an axis perpendicular to the adjustment support 42. The drill holder 46 receives the drill 1.
  • the Bohrerhal is ö to adjust the tip angle t augmentation pivoted accordingly.
  • the adjustment support 42 defines the angle of attack ⁇ , which must be adapted to the contour of the grinding wheel profile.
  • the adjustment support 42 can also be rigidly attached to the machine bed 41 and the grinding wheel 2 'can be pivoted about a vertical axis in the frame 40 in order to be able to implement the method described above.

Landscapes

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

Claims (9)

1. Procédé pour produire un affûtage de pointe de corps cylindriques de forets hélicoïdaux, le tranchant principal (6) du foret (1) étant incliné au moyen d'une monture de foret (20; 46) d'un angle au sommet prédéterminé (δ) par rapport à la surface périphérique d'enlèvement de copeaux d'une meule (2') dont la périphérie est profilée de façon correspondante, et la surface latérale cylindrique (Z) définissant la face de dépouille principale (7a, 7b) du foret et son angle de dépuille (a) étant engendré au moyen d'un mouvement relatif de translation (T) produit entre la meule (2') et l'axe (1a) du foret, sensiblement parallèle au tranchant principal (6), caractérisé en ce que le mouvement relativ de translation (T) est effectué dans une direction qui fait un angle d'inclinaison réglable (tp) avec le plan radial (R) de la meule (2').
2. Procédé selon la revendication 1, caractérisé en ce que le foret (1) pivote, pendant l'affûtage en synchronisme avec le mouvement relativ de translation (T), avec une certaine vitesse angulaire, autour d'un axe coïncidant avec le tranchant principal (6).
3. Procédé selon la revendication 1, caractérisé en ce que le foret (17) pivote, pendant l'affûtage en synchronisme avec le mouvement relatif de translation (T), avec une certaine vitesse angulaire autour de l'axe (1 a) du foret.
4. Dispositif pour mettre en oeuvre le procédé selon l'une des revendications 1 à 3, dans le cas d'un usinage du foret par le procédé de transfert rotatif pa à pas, comportant une monture de foret (20) fixée sur un plateau de transfert rotatif (21) et une unité d'affûtage (22) qui comporte un support d'avance longitudinal (23) aligné avec l'axe (1a) du foret, un support transversal (24) qui y est guidé de façon à pouvoir effecteur des translations, pour régler l'angle de dépouille (a), ansi qu'une plaque de support (26) placée de façon à pouvoir pivoter autour d'un axe de pivotement (Dδ) perpendiculaire à l'axe (1 a) du foret et au tranchant principal (6) dans le support transversal (24), dont le pivotement permet de fixer l'angle au sommet (δ) du foret (1) et sur laquelle est placé un chariot (27) mobile parallèlement au tranchant principal (6), qui porte, au moyen d'une monture (28), une meule montée autour d'un axe de rotation (2a'), caractérisé en ce que l'axe de rotation (2a') de la meule est parallèle à la plaque de support (26), et en ce que la meule (2') peut au moyen de la monture (28), pivoter dans un plan parallèle à la plaque de support (26) et être bloquée pour l'affûtage, et présente, sur sa face extérieure, un profilage (11') dont le contour, observé dans le plan radial (R) de la meule, forme un secteur d'ellipse et, observé dans la direction d'avencement (T) du chariot, un secteur de cercle (10) qui vient coïncider avec la face de dépouille (7a, 7b) à affûter.
5. Dispositif selon la revendication 4, caractérisé en ce que l'axe de rotation (2a') de la meule (2') est décalé en rotation de la position parallèle à l'axe de rotation de la plaque de support (26) d'un certain angle d'inclinaison (ϕ).
6. Dispositif pour mettre en oeuvre le procédé selon l'une des revendications 1 à 3, au moyen d'une machine universelle ou d'une machine à affûter, les surfaces dont l'axe de la meule est dirigé horizontalement, comportant une meule (2') fixe dans un bâti (40) et un dispositif d'affûtage (42 à 46) comportant une monture de foret (46) positionnant le tranchant principal (6) par rapport à la surface à affûter, caractérisé en ce que la monture (46) du foret est placée de façon à pouvoir pivoter dans un plan vertical par rapport au bâti (40) et sur un chariot d'avancement (44) mobile horizontalement qui est guidé sur un support de réglage (42) pouvant pivoter autour d'un axe vertical et être fixé sur le bâti (40), et en ce que la meule (2') présente une face extérieure profilée dont le contour forme, en observant dans le plan raidal (R) de la meule, in secteur d'ellipse (10') et, dans le sens d'avancement (T) du chariot d'avancement (44) un secteur de cercle (10) qui vient coïncider avec la face de dépouille (7a, 7b) du foret (1) à affûter.
7. Dispositif selon la revendication 6, caractérisé en ce que le support de réglage (42) est incliné par rapport au plan radial (R) de la meule (2').
8. Dispositif selon l'une des revendications 4 à 7, caractérisé en ce que la monture de foret peut pivoter autour d'un axe coïncidant avec le tranchant principal (6).
9. Dispositif selon l'une des revendications 4 à 7, caractérisé en ce que la monture de foret (20, 46) peut tourner autour de l'axe (1 a) du foret (1).
EP81107335A 1980-09-17 1981-09-16 Procédé et dispositif pour affûter la pointe d'un foret hélicoidal Expired EP0048031B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81107335T ATE15002T1 (de) 1980-09-17 1981-09-16 Verfahren und vorrichtung zur erzeugung eines spiralbohrer-spitzenanschliffs.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3035099 1980-09-17
DE3035099A DE3035099C2 (de) 1980-09-17 1980-09-17 Verfahren und Vorrichtung zur Erzeugung eines Zylindermaterial-Spitzenanschliffs von Spiralbohrern

Publications (3)

Publication Number Publication Date
EP0048031A2 EP0048031A2 (fr) 1982-03-24
EP0048031A3 EP0048031A3 (en) 1982-07-14
EP0048031B1 true EP0048031B1 (fr) 1985-08-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP81107335A Expired EP0048031B1 (fr) 1980-09-17 1981-09-16 Procédé et dispositif pour affûter la pointe d'un foret hélicoidal

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EP (1) EP0048031B1 (fr)
AT (1) ATE15002T1 (fr)
DE (1) DE3035099C2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3039649C2 (de) * 1979-04-18 1983-12-08 Karl 7539 Kämpfelbach Reiling Vorrichtung zum Schleifen der Schneiden von Spiralbohrern
JPS61279454A (ja) * 1985-06-01 1986-12-10 Toa Kikai Seisakusho:Kk ドリル研削盤
JP2537417Y2 (ja) * 1990-12-15 1997-06-04 株式会社東亜機械製作所 シンニング兼用ドリル研削盤
DE102019214867B4 (de) * 2019-09-27 2021-10-28 Kadia Produktion Gmbh + Co. Honmaschine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1064892A (en) * 1965-03-17 1967-04-12 Brierley Zachry A method of and a machine for grinding twist drill points
DD113713A1 (fr) * 1974-08-23 1975-06-20

Also Published As

Publication number Publication date
EP0048031A3 (en) 1982-07-14
ATE15002T1 (de) 1985-09-15
EP0048031A2 (fr) 1982-03-24
DE3035099C2 (de) 1985-11-28
DE3035099A1 (de) 1982-03-25

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