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EP1263557A1 - Drill, especially a forstner bit or a multi-spur machine bit - Google Patents

Drill, especially a forstner bit or a multi-spur machine bit

Info

Publication number
EP1263557A1
EP1263557A1 EP01911226A EP01911226A EP1263557A1 EP 1263557 A1 EP1263557 A1 EP 1263557A1 EP 01911226 A EP01911226 A EP 01911226A EP 01911226 A EP01911226 A EP 01911226A EP 1263557 A1 EP1263557 A1 EP 1263557A1
Authority
EP
European Patent Office
Prior art keywords
drill
cutter
head
bit
spur
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
EP01911226A
Other languages
German (de)
French (fr)
Other versions
EP1263557B1 (en
Inventor
Helmut Eberhard
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.)
Johann Eberhard GmbH
Original Assignee
Johann Eberhard GmbH
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
Priority claimed from AT3572000A external-priority patent/AT409600B/en
Application filed by Johann Eberhard GmbH filed Critical Johann Eberhard GmbH
Publication of EP1263557A1 publication Critical patent/EP1263557A1/en
Application granted granted Critical
Publication of EP1263557B1 publication Critical patent/EP1263557B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G15/00—Boring or turning tools; Augers

Definitions

  • Drills especially Forstner drills or artificial drills
  • the invention relates to a drill, in particular Forstner drill or artificial drill, with a drill shank and a cutting head which has a central mandrel from which a first and a second end cutting edge extend radially outward in the opposite direction of attack, with the circumferential ends of the first and the second end cutting edge is adjoined in each case by a hollow cylinder segment-like wall which delimits the circumference of the cutting head and has a peripheral cutting edge which, at its end remote from the front cutting edge, delimits a chip space which opens to the other end cutting edge and penetrates the drilling head.
  • Drill bits of this type are mass-produced products that are intended for use in hand, column, dowel or row drilling machines and are produced and sold in large quantities. It can be used to drill holes with a relatively large diameter in a wide variety of materials, from plastic-coated chipboard, glued wood panels to acrylic panels and other base materials.
  • the disadvantage of previously known drills lies in the relatively high drilling forces or torques that have to be applied by the drilling machines, since the end cutting edges and the peripheral cutting edges with their straight edges have to overcome a high material resistance.
  • peripheral edges of such known drills tend to overheat due to the high load during the drilling process, which is evident from a blue tarnish. This can result in permanent damage to the drill.
  • circumferential cutting edges with a tooth-like design have been used. However, these cause the drill to be guided improperly and the borehole is torn out.
  • the object of the invention is to provide a drill of the type mentioned, with the help of which the efficiency of the energy used for a bore to be drilled can be increased or with which bores can be carried out using low drilling forces, the material load on the drill being kept relatively low becomes.
  • the two peripheral cutting edges have, at least partially along their course, undulating depressions and elevations.
  • the constant friction occurring in known circumferential cutting edges within the drilling material is reduced to a more or less punctiform friction, thereby avoiding permanent rubbing. In this way, a lower torque of the drilling machine is required to drill a hole, which is why the drill penetrates much easier, for example, into the wood.
  • the wave-shaped depressions and elevations are formed by serrated edges.
  • the invention further relates to a method for producing a drill, in particular a Forstner drill or an artificial drill.
  • the object of the invention is to enable automated machining of the peripheral cutting edges of a drill in a technically simple and precise manner.
  • the drill shaft is ground and then the elevations and depressions are hard-milled with a hard milling cutter, in particular with the formation of a serrated edge. In this way, a very precise design of the peripheral cutting edges can be achieved.
  • Fig.l is an end view of an embodiment of the drill according to the invention.
  • FIG. 2 shows a side view of the drill according to Fig.l
  • FIG. 3 shows a view rotated by 90 ° with respect to the illustration in FIG
  • Figure 4 shows a detail of the view shown in Figure 3.
  • Fig.l and Fig.2 show a Forstner bit, which is composed essentially of a drill shaft 2, which is used for clamping in a drill chuck, and a cutting head 4.
  • the cutting head 4 has a protruding central dome 1, from which a first and a second end cutting edge 100, 100 'extend radially outward in the opposite direction of attack.
  • the central mandrel is pointed in a pyramid-like manner, as a result of which the drill can be placed precisely on a marking for a borehole.
  • the mandrel 1 penetrates so far into the material to be drilled that the drill is prevented from slipping when the drilling machine is started up.
  • a hollow cylinder segment-like wall 10 which delimits the circumference of the cutting head 4, adjoins a peripheral cutting edge 8, one at the end of which is removed from the end cutting edge Front cutting edge opening, the chip head penetrating chip space 7 limited.
  • a surface 12 that slopes down toward the adjacent wall 10 runs from the end cutting edges 100, 100 ′.
  • the two circumferential cutting edges 8 have undulating depressions 13 and elevations 14 along their course. These can also run only along partial areas of the peripheral cutting edges 8.
  • the wave-shaped depressions 13 and elevations 14 are preferably formed by serrated edges.
  • the invention can be applied to a Forstner bit, an artificial bit or a similar wood bit.
  • the drill according to the invention is manufactured in the following sections.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Drilling Tools (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Drilling And Boring (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

The invention relates to a drill, especially a Forstner bit or a multi-spur machine bit, having a drill shaft (2) and a cutter head (4) which is provided with a central mandrel (1). A first and a second spur cutter (100, 100') radially extend towards the outside from said mandrel and in opposite tool approach directions. A hollow cylinder segment-like wall (10) respectively that has a circumference cutter (8) and defines the circumference of the cutter head (4) is joined to the ends of the first and second spur cutter (100, 100'), whereby said ends face the circumference. Said wall defines a chip space (7) on the end thereof that faces away from the spur cutter (100, 100'). Said space opens to the respective remaining spur cutter and penetrates the drill head. The two circumference cutters (8) are provided with wave-shaped cavities (13) and elevations (14), at least partially along the side thereof.

Description

Bohrer, insbesondere Forstnerbohrer oder Kunstbohrer Drills, especially Forstner drills or artificial drills
Die Erfindung betrifft einen Bohrer, insbesondere Forstnerbohrer oder Kunstbohrer, mit einem Bohrschaft und einem Schneidkopf, welcher einen zentralen Dorn aufweist, von dem aus sich eine erste und eine zweite Stirnschneide radial in zueinander entgegengesetzter Anstellrichtung nach außen erstrecken, wobei an den umfangseitigen Enden der ersten und der zweiten Stirnschneide jeweils eine den Umfang des Schneidkopfes begrenzende, hohlzylindersegment-artige Wand mit einer Umfangschneide anschließt, die an ihrem von der Stirnschneide entfernten Ende einen jeweils zur anderen Stirnschneide sich öffnenden, den Bohrkopf durchdringenden Spanraum begrenzt.The invention relates to a drill, in particular Forstner drill or artificial drill, with a drill shank and a cutting head which has a central mandrel from which a first and a second end cutting edge extend radially outward in the opposite direction of attack, with the circumferential ends of the first and the second end cutting edge is adjoined in each case by a hollow cylinder segment-like wall which delimits the circumference of the cutting head and has a peripheral cutting edge which, at its end remote from the front cutting edge, delimits a chip space which opens to the other end cutting edge and penetrates the drilling head.
Bohrer dieser Art sind Massenprodukte, die für den Einsatz in Hand-, Ständer- , Dübel- oder Reihenbohrmaschinen vorgesehen sind und in großer Stückzahl produziert und vertrieben werden. Es können damit Bohrungen mit relativ großem Durchmesser in verschiedensten Materialien, von kunststoffbeschichteten Spanfaserplatten, verleimten Holzplatten bis zu Acrylglasplatten und anderen Grundwerkstoffen gebohrt werden. Der Nachteil bisher bekannter Bohrer liegt in den relativ hohen Bohrkräften bzw. Drehmomenten, die von den Bohrmaschinen aufgebracht werden müssen, da die Stirnschneiden und die Umfangschneiden mit ihren geraden Kanten einen hohen Materialwiderstand überwinden müssen.Drill bits of this type are mass-produced products that are intended for use in hand, column, dowel or row drilling machines and are produced and sold in large quantities. It can be used to drill holes with a relatively large diameter in a wide variety of materials, from plastic-coated chipboard, glued wood panels to acrylic panels and other base materials. The disadvantage of previously known drills lies in the relatively high drilling forces or torques that have to be applied by the drilling machines, since the end cutting edges and the peripheral cutting edges with their straight edges have to overcome a high material resistance.
Die Umfangschneiden solcher bekannten Bohrer neigen dazu, sich aufgrund der hohen Belastung während des Bohrvorganges zu überhitzen, was durch ein Blau- Anlaufen ersichtlich wird. Es kann dadurch zu einer dauerhaften Schädigung des Bohrers kommen. Zur Vermeidung dieses Uberhitzungseffektes sind Umfangschneiden mit zahnähnlicher Ausbildung eingesetzt worden. Diese verursachen jedoch eine unsaubere Führung des Bohrers und es kommt zum Ausreißen des Bohrloches.The peripheral edges of such known drills tend to overheat due to the high load during the drilling process, which is evident from a blue tarnish. This can result in permanent damage to the drill. To avoid this overheating effect, circumferential cutting edges with a tooth-like design have been used. However, these cause the drill to be guided improperly and the borehole is torn out.
Aufgabe der Erfindung ist es, einen Bohrer der eingangs genannten Art anzugeben, mit dessen Hilfe der Wirkungsgrad der für eine durchzuführende Bohrung aufgewandten Energie erhöht werden kann bzw. mit dem Bohrungen unter Anwendung geringer Bohrkräfte ausgeführt werden können, wobei die Materialbelastung des Bohrers relativ gering gehalten wird.The object of the invention is to provide a drill of the type mentioned, with the help of which the efficiency of the energy used for a bore to be drilled can be increased or with which bores can be carried out using low drilling forces, the material load on the drill being kept relatively low becomes.
Erfindungsgemäß wird dies dadurch erreicht, daß die beiden Umfangschneiden zumindest teilweise entlang ihres Verlaufes wellenförmige Vertiefungen und Erhebungen aufweisen.According to the invention, this is achieved in that the two peripheral cutting edges have, at least partially along their course, undulating depressions and elevations.
Durch die wellenförmig gestalteten Umfangschneiden, die als gezogene Vorschneider wirken, wird die bei bekannten Umfangschneiden auftretende ständige Reibung innerhalb des Bohrmaterials auf eine mehr oder wenige punktförmige Reibung herabgesetzt und dadurch ein permanentes Reiben vermieden. Auf diese Weise ist ein geringeres Drehmoment der Bohrmaschine für das Ausführen einer Bohrung erforderlich, weswegen der Bohrer wesentlich leichter z.B. in das Holz eindringt. In weiterer Ausbildung der Erfindung kann vorgesehen sein, daß die wellenförmigen Vertiefungen und Erhebungen durch Wellenschliff gebildet sind.Due to the wave-shaped circumferential cutting edges, which act as drawn pre-cutters, the constant friction occurring in known circumferential cutting edges within the drilling material is reduced to a more or less punctiform friction, thereby avoiding permanent rubbing. In this way, a lower torque of the drilling machine is required to drill a hole, which is why the drill penetrates much easier, for example, into the wood. In a further embodiment of the invention it can be provided that the wave-shaped depressions and elevations are formed by serrated edges.
Durch die Ausbildung eines Wellenschliffes auf der Umfangschneide wird eine sehr saubere Schnittführung des Bohrers gewährleistet und ein Ausreißen der Bohrung vermieden.The formation of a serrated edge on the circumferential cutting edge ensures a very clean cut of the drill and prevents the hole from being torn out.
Weiters betrifft die Erfindung ein Verfahren zur Herstellung eines Bohrers, insbesondere eines Forstnerbohrers oder eines Kunstbohrers.The invention further relates to a method for producing a drill, in particular a Forstner drill or an artificial drill.
Aufgabe der Erfindung ist es, eine automatisierte Bearbeitung der Umfangschneiden eines Bohrers auf technisch einfache und präzise Weise zu ermöglichen.The object of the invention is to enable automated machining of the peripheral cutting edges of a drill in a technically simple and precise manner.
Erfindungsgemäß wird dies dadurch erreicht, daß in die Umfangschneiden des gehärteten Bohrkopfes entlang ihres Verlaufes wellenförmige Vertiefungen und Erhebungen hartgefräst werden.According to the invention, this is achieved in that undulating depressions and elevations are hard-milled in the peripheral cutting edges of the hardened drill head along their course.
Nach dem Härten des Bohrer-Rohlings wird der Bohrschaft geschliffen und anschließend werden die Erhebungen und Vertiefungen, insbesondere unter Ausbildung eines Wellenschliffes, mit einem Hartfräser hartgefräst. Auf diese Weise kann eine sehr genaue Gestaltung der Umfangschneiden erreicht werden.After the drill blank has hardened, the drill shaft is ground and then the elevations and depressions are hard-milled with a hard milling cutter, in particular with the formation of a serrated edge. In this way, a very precise design of the peripheral cutting edges can be achieved.
Nachfolgend wird die Erfindung anhand des in den beigeschlossenen Zeichnungen dargestellten Ausführungsbeispiels eingehend erläutert. Es zeigt dabeiThe invention is explained in detail below with reference to the exemplary embodiment illustrated in the accompanying drawings. It shows
Fig.l eine Stirnansicht einer Ausführungsform des erfindungsgemäßen Bohrers;Fig.l is an end view of an embodiment of the drill according to the invention;
Fig.2 eine Seitenansicht des Bohrers gemäß Fig.l;2 shows a side view of the drill according to Fig.l;
Fig.3 eine gegenüber der Darstellung in Fig.2 um 90° gedrehte Ansicht und3 shows a view rotated by 90 ° with respect to the illustration in FIG
Fig.4 ein Detail der in Fig.3 gezeigten Ansicht.Figure 4 shows a detail of the view shown in Figure 3.
Fig.l und Fig.2 zeigen einen Forstnerbohrer, der sich im wesentlichen aus einem Bohrschaft 2, der zum Einspannen in ein Bohrfutter dient, und aus einem Schneidkopf 4 zusammensetzt. Der Schneidkopf 4 weist einen vorstehenden zentralen Dom 1 auf, von dem aus sich eine erste und eine zweite Stirnschneide 100, 100' radial in zueinander entgegengesetzter Anstellrichtung nach außen erstrecken. Im Ausführungsbeispiel gemäß Fig.l ist der zentrale Dorn pyramidenartig zugespitzt, wodurch ein präzises Aufsetzen des Bohrers auf eine Markierung für ein Bohrloch ermöglicht wird. Dabei dringt der Dorn 1 soweit in das zu bohrende Material ein, daß ein Verrutschen des Bohrers bei Inbetriebnahme der Bohrmaschine verhindert wird.Fig.l and Fig.2 show a Forstner bit, which is composed essentially of a drill shaft 2, which is used for clamping in a drill chuck, and a cutting head 4. The cutting head 4 has a protruding central dome 1, from which a first and a second end cutting edge 100, 100 'extend radially outward in the opposite direction of attack. In the exemplary embodiment according to FIG. 1, the central mandrel is pointed in a pyramid-like manner, as a result of which the drill can be placed precisely on a marking for a borehole. The mandrel 1 penetrates so far into the material to be drilled that the drill is prevented from slipping when the drilling machine is started up.
An den umf angsei ti gen Enden der ersten und der zweiten Stirnschneide 100, 100' schließt jeweils eine den Umfang des Schneidkopfes 4 begrenzende, hohlzylindersegment- artige Wand 10 mit einer Umfangschneide 8 an, die an ihrem von der Stirnschneide entfernten Ende einen jeweils zur anderen Stirnschneide sich öffnenden, den Bohrkopf durchdringenden Spanraum 7 begrenzt. Von den Stirnschneiden 100, 100' verläuft eine jeweils zur anschließenden Wand 10 hin abfallende Fläche 12. Um eine Überhitzung der Umfangschneiden 8 zu vermeiden, ist vorgesehen, daß die beiden Umfangschneiden 8 entlang ihres Verlaufes wellenförmige Vertiefungen 13 und Erhebungen 14 aufweisen. Diese können auch nur entlang von Teilbereichen der Umfangschneiden 8 verlaufen.At the circumferential ends of the first and the second end cutting edges 100, 100 ', a hollow cylinder segment-like wall 10, which delimits the circumference of the cutting head 4, adjoins a peripheral cutting edge 8, one at the end of which is removed from the end cutting edge Front cutting edge opening, the chip head penetrating chip space 7 limited. A surface 12 that slopes down toward the adjacent wall 10 runs from the end cutting edges 100, 100 ′. In order to avoid overheating of the circumferential cutting edges 8, it is provided that the two circumferential cutting edges 8 have undulating depressions 13 and elevations 14 along their course. These can also run only along partial areas of the peripheral cutting edges 8.
Vorzugsweise sind die wellenförmigen Vertiefungen 13 und Erhebungen 14 durch Wellenschliff gebildet sind.The wave-shaped depressions 13 and elevations 14 are preferably formed by serrated edges.
Die Erfindung kann auf einen Forstnerbohrer, einen Kunstbohrer oder einen ähnlichen Holzbohrer angewandt werden.The invention can be applied to a Forstner bit, an artificial bit or a similar wood bit.
Die Herstellung des erfindungsgemäßen Bohrers geht in folgenden Schirtten vor sich.The drill according to the invention is manufactured in the following sections.
1) Schmieden des Rohlings, gegebenenfalls Brünieren1) Forging the blank, if necessary burnishing
2) Härten2) hardening
3) Schleifen des Bohrschafts3) Grinding the drill shaft
4) Hartfräsen der Erhebungen/Vertiefungen bzw. des Wellenschliffes aus dem gehärteten Bohrkopf. 4) Hard milling of the elevations / depressions or the serrated edge from the hardened drill head.

Claims

P A T E N T A N S P R Ü C H E PATENT CLAIMS
1. Bohrer, insbesondere Forstnerbohrer oder Kunstbohrer, mit einem Bohrschaft und einem Schneidkopf, welcher einen zentralen Dorn aufweist, von dem aus sich eine erste und eine zweite Stirnschneide radial in zueinander entgegengesetzter Anstellrichtung nach außen erstrecken, wobei an den umfangseitigen Enden der ersten und der zweiten Stirnschneide jeweils eine den Umfang des Schneidkopfes begrenzende, hohlzylindersegment-artige Wand mit einer Umfangschneide anschließt, die an ihrem von der Stirnschneide entfernten Ende einen jeweils zur anderen Stirnschneide sich öffnenden, den Bohrkopf durchdringenden Spanraum begrenzt, dadurch gekennzeichnet, daß die beiden Umfangschneiden (8) zumindest teilweise entlang ihres Verlaufes wellenförmige Vertiefungen (13) und Erhebungen (14) aufweisen.1. Drills, in particular Forstner drills or artificial drills, with a drill shank and a cutting head which has a central mandrel from which a first and a second end cutting edge extend radially outward in the opposite direction of attack, with the circumferential ends of the first and the second end cutting edge each adjoins a hollow cylinder segment-like wall which delimits the circumference of the cutting head and has a peripheral cutting edge which, at its end remote from the front cutting edge, delimits a chip space which opens to the other front cutting edge and penetrates the drill head, characterized in that the two peripheral cutting edges (8 ) have at least partially wavy depressions (13) and elevations (14) along their course.
2. Bohrer nach Anspruch 1, dadurch gekennzeichnet, daß die wellenförmigen Vertiefungen (13) und Erhebungen (14) durch Wellenschliff gebildet sind.2. Drill according to claim 1, characterized in that the undulating depressions (13) and elevations (14) are formed by serrated edges.
3. Verfahren zur Herstellung eines Bohrers, insbesondere eines Forstnerbohrers oder eines Kunstbohrers, dadurch gekennzeichnet, daß in die Umfangschneiden (8) des gehärteten Bohrkopfes entlang ihres Verlaufes wellenförmige Vertiefungen (13) und Erhebungen (14) hartgefräst werden.3. A method for producing a drill, in particular a Forstner bit or an artificial drill, characterized in that undulating depressions (13) and elevations (14) are hard-milled in the peripheral cutting edges (8) of the hardened drill head along their course.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß in die Umfangschneiden (8) ein Wellenschliff hartgefräst wird. 4. The method according to claim 3, characterized in that a serrated edge is hard milled in the peripheral cutting edges (8).
EP01911226A 2000-03-03 2001-02-27 Drill, especially a forstner bit or a multi-spur machine bit Expired - Lifetime EP1263557B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
AT3572000A AT409600B (en) 2000-03-03 2000-03-03 Drill has drill shaft and cutter head with central mandrel, two end cutter blades, chip space defined by hollow cylindrical wall, with peripheral cutter blade.
AT3572000 2000-03-03
US25529100P 2000-12-13 2000-12-13
US255291P 2000-12-13
PCT/AT2001/000053 WO2001064407A1 (en) 2000-03-03 2001-02-27 Drill, especially a forstner bit or a multi-spur machine bit

Publications (2)

Publication Number Publication Date
EP1263557A1 true EP1263557A1 (en) 2002-12-11
EP1263557B1 EP1263557B1 (en) 2004-05-06

Family

ID=25608302

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01911226A Expired - Lifetime EP1263557B1 (en) 2000-03-03 2001-02-27 Drill, especially a forstner bit or a multi-spur machine bit

Country Status (9)

Country Link
EP (1) EP1263557B1 (en)
JP (1) JP5110755B2 (en)
AT (1) ATE265917T1 (en)
AU (1) AU4031201A (en)
CA (1) CA2401134C (en)
DE (1) DE50102205D1 (en)
ES (1) ES2221888T3 (en)
PT (1) PT1263557E (en)
WO (1) WO2001064407A1 (en)

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US7648316B2 (en) 2006-01-26 2010-01-19 Wolfcraft, Gmbh Forstner drill bit

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JP7390756B1 (en) 2022-11-17 2023-12-04 株式会社オーゾネ Wooden bat processing equipment and wooden bat processing method

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Publication number Priority date Publication date Assignee Title
US7648316B2 (en) 2006-01-26 2010-01-19 Wolfcraft, Gmbh Forstner drill bit

Also Published As

Publication number Publication date
JP2004502565A (en) 2004-01-29
WO2001064407A1 (en) 2001-09-07
EP1263557B1 (en) 2004-05-06
CA2401134A1 (en) 2001-09-07
JP5110755B2 (en) 2012-12-26
ES2221888T3 (en) 2005-01-16
CA2401134C (en) 2008-08-26
DE50102205D1 (en) 2004-06-09
AU4031201A (en) 2001-09-12
PT1263557E (en) 2004-09-30
ATE265917T1 (en) 2004-05-15

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