EP0824626B1 - Drilling tool - Google Patents
Drilling tool Download PDFInfo
- Publication number
- EP0824626B1 EP0824626B1 EP96914085A EP96914085A EP0824626B1 EP 0824626 B1 EP0824626 B1 EP 0824626B1 EP 96914085 A EP96914085 A EP 96914085A EP 96914085 A EP96914085 A EP 96914085A EP 0824626 B1 EP0824626 B1 EP 0824626B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cutting edge
- drilling tool
- tool according
- drilling
- main
- 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 - Lifetime
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/58—Chisel-type inserts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/89—Tool or Tool with support
- Y10T408/905—Having stepped cutting edges
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/89—Tool or Tool with support
- Y10T408/909—Having peripherally spaced cutting edges
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T408/00—Cutting by use of rotating axially moving tool
- Y10T408/89—Tool or Tool with support
- Y10T408/909—Having peripherally spaced cutting edges
- Y10T408/9095—Having peripherally spaced cutting edges with axially extending relief channel
- Y10T408/9097—Spiral channel
Definitions
- the present invention relates to a drilling tool with a Drilling head with an end face pointing in the feed direction, one main insert, one in the drill axis lying drill bit forms and on both sides essentially is inclined roof-shaped, at least two Additional blades that are essentially symmetrical under one Angles to the main cutting axis are arranged and their Cutting axes the main cutting axis in the drill axis of the Cut the drill head, and has drill flutes, the Main insert a primary cutting edge that overlaps radially extends at least one side of the main insert and has a secondary cutting edge that extends over in essentially the remaining length of the main insert extends radially and axially against the feed direction compared to the primary cutting edge by at least the drilling feed in Millimeters per revolution is reset.
- Drilling tools known from DE-PS 43 38 667 and DE-PS 35 00 202 have a main insert that overlaps the entire drill head determining the borehole diameter extends of the drilling tool and point and as a cutting element is axially symmetrical. Deliver such drilling tools unsatisfactory drilling progress and / or require a lot of effort. Furthermore, can a symmetrical cutting edge structure in use, even with transverse ones Vibrations cause a geometrically uneven Result in hole shape.
- the invention is therefore based on the object of a drilling tool of the type mentioned above, with which higher drilling progress and circular holes can be.
- this object is achieved in that the both sides of the Main insert have different lengths, whereby the long side over the circumferential contour of the base body protrudes, the primary cutting edge extends over at least the long one Side of the main insert and the secondary cutting edge itself over essentially the remaining length of the Main cutting insert extends radially and the radially outer Ends of the additional cutting edges on the same rotating circle as that radially outer end of the primary cutting edge and together the Determine nominal drilling diameter while the radially outer end the secondary cutting edge lies radially inward, as well as the Additional cutting on at least part of their cutting lengths Advance in the direction of drilling feed over the secondary cutting edge stand behind the primary cutting edge.
- the axial offset of the secondary cutting edge is advantageously increased the primary cutting edge depending on the material properties of the material to be drilled.
- the secondary cutting edge is advantageously approximately Set back 0.3 to 1.5 mm from the primary cutting edge.
- the length of the secondary cutting edge depending on the material properties of the material to be drilled is selected.
- the radially outer End of the short side of the main insert with secondary cutting edge does not protrude beyond the circumferential contour of the base body.
- the primary cutting edge overlaps 5/8 to 3/4 of the nominal drilling diameter extends.
- the angle between the respective additional cutting edge is and the main insert preferably 20 ° to 70 °.
- angle ( ⁇ ) between the respective additional cutting edge and the main insert selected depending on the volume of drilling dust is.
- additional drilling dust grooves are arranged behind the additional cutting edges.
- the cross section of the drilling dust grooves depending on the amount of machined Drilling dust per time is selected.
- the additional cutting edges include pins.
- the invention is based on the surprising finding that by the inventive design of the drilling tool at least four cutting edges, of which only three cutting edges determine the contour of the borehole, geometrically round boreholes be achieved because a circle is geometric through three points is not overdetermined.
- the insert is in the range of the selected shape higher peripheral speed or the longer distance several Cutting in use. This reduces cutting edge wear per cutting edge.
- Fig. 1 shows a top view of the end face of a drilling tool according to the present invention.
- a main cutting plate 12 is arranged, which forms a drill tip 14 lying in the drill axis and inclined essentially roof-shaped on both sides is trained.
- Symmetrical to the main cutting axis 16 on the main cutting plate 12 are two additional cutting edges 18 arranged at an angle a of 60 °, the Cutting axes the main cutting axis 16 in the drill axis of the drill head.
- Drill dust grooves 20 Between the main insert 12 and the additional cut 18 are Drill dust grooves 20.
- the main cutting tip 12 points from the drill tip 14 proceeding from a long side 22, which extends over the peripheral contour of the base body 10 protrudes, and a short side 24 on, which also over the circumferential contour of the base body protrudes, but in relation to the central axis of the tool is shorter than the long side 22.
- the main insert 12 has a primary cutting edge 26 which overlaps 5/8 of the nominal drilling diameter, i.e. over the long side 22 and contiguous over part of the short side 24 extends, and a secondary cutting edge 28, which extends over the remaining length of the short side 24 extends.
- the main cutting insert according to the invention which basically takes over the main guiding work and the essential part of the chiseling effect, has a significantly higher rock removal ratio due to the shortening of the effective cutting length (with the same drilling diameter) compared to a drilling tool according to the prior art, whereby the drilling tool works much faster.
- the radially outer ends of the additional cutters 18 lie on the same rotation circle with a diameter D 1 , which corresponds to the nominal drilling diameter of the drilling tool, as the radially outer end of the primary cutting edge 26.
- FIG 2 shows an edge region of the drilling tool of Figure 1 in detail.
- This edge area comprises part of the short side 24 of the main insert 12 and one of the two additional cutting edges 18.
- the primary cutting edge 26 extends over the long side 22 and part of the short Page 24 for a total of 5/8 of the nominal drilling diameter D1.
- the additional cutting edges 18 comprise cutting plates, the cutting edges 19 of which The embodiment shown here is essentially parallel to the cutting edges of the primary cutting edge 26 and the secondary cutting edge 28 are aligned, but in the direction of drilling feed V protrude beyond the secondary cutting edge 28 and behind the primary cutting edge 26 stand back.
- the cutting edge such as pins with a cone or truncated cone and the same, the course of the cutting edge between the Primary cutting edge 26 and the secondary cutting edge 28 lie.
- Such a cutter with four or more cutting edges delivers circular drill holes as compared to a conventional one Vierschneider only three points, namely the radial outer ends of the primary cutting edge 26 and the additional cutting edges 18, used to make a circular borehole deliver.
- the preferably suitable values from 0.3 to 1.5 mm for the resetting of the secondary cutting edge 28 compared to the Primary cutting edge 26 result from the specific rock of the current drilling progress.
Abstract
Description
Die vorliegende Erfindung betrifft ein Bohrwerkzeug mit einem Bohrkopf mit einer in Vorschubrichtung weisenden Stirnseite, die eine Hauptschneidplatte, die eine in der Bohrerachse liegende Bohrerspitze bildet und zu beiden Seiten im wesentlichen dachförmig geneigt ausgebildet ist, mindestens zwei Zusatzschneiden, die im wesentlichen symmetrisch unter einem Winkel zu der Hauptschneidachse angeordnet sind und deren Schneidachsen die Hauptschneidachse in der Bohrerachse des Bohrkopfes schneiden, und Bohrmehlnuten aufweist, wobei die Hauptschneidplatte eine Primärschneide, die sich über mindestens eine Seite der Hauptschneidplatte radial erstreckt und eine Sekundärschneide aufweist, die sich über im wesentlichen die verbleibende Länge der Hauptschneidplatte radial erstreckt und entgegen der Vorschubrichtung axial gegenüber der Primärschneide um mindestens den Bohrvorschub in Millimeter pro Umdrehung zurückgesetzt ist. The present invention relates to a drilling tool with a Drilling head with an end face pointing in the feed direction, one main insert, one in the drill axis lying drill bit forms and on both sides essentially is inclined roof-shaped, at least two Additional blades that are essentially symmetrical under one Angles to the main cutting axis are arranged and their Cutting axes the main cutting axis in the drill axis of the Cut the drill head, and has drill flutes, the Main insert a primary cutting edge that overlaps radially extends at least one side of the main insert and has a secondary cutting edge that extends over in essentially the remaining length of the main insert extends radially and axially against the feed direction compared to the primary cutting edge by at least the drilling feed in Millimeters per revolution is reset.
Aus der DE-PS 43 38 667 und der DE-PS 35 00 202 bekannte Bohrwerkzeuge weisen eine Hauptschneidplatte auf, die sich über den gesamten, den Bohrlochdurchmesser bestimmenden Bohrkopf des Bohrwerkzeuges erstreckt und als Schneidelement punkt- und achsensymmetrisch aufgebaut ist. Derartige Bohrwerkzeuge liefern einen noch immer unbefriedigenden Bohrfortschritt und/ oder erfordern einen hohen Kraftaufwand. Darüber hinaus kann ein symmetrischer Schneidenaufbau im Einsatz auch zu transversalen Schwingungen führen, die eine geometrisch ungleichmäßige Lochform zur Folge haben.Drilling tools known from DE-PS 43 38 667 and DE-PS 35 00 202 have a main insert that overlaps the entire drill head determining the borehole diameter extends of the drilling tool and point and as a cutting element is axially symmetrical. Deliver such drilling tools unsatisfactory drilling progress and / or require a lot of effort. Furthermore, can a symmetrical cutting edge structure in use, even with transverse ones Vibrations cause a geometrically uneven Result in hole shape.
Die DE 29 52 296 A1 beschreibt ein Bohrwerkzeug gemäß dem Oberbegriff von Anspruch 1. Da bei diesem Bohrwerkzeug das Bohren durch vier Schneiden ausgeführt wird, ist das Bohrloch geometrisch überbestimmt und lassen sich keine runden Bohrlöcher erzielen. DE 29 52 296 A1 describes a drilling tool according to the Preamble of claim 1. Since in this drilling tool Drilling by four cutting edges is the borehole geometrically overdetermined and there are no round drill holes achieve.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Bohrwerkzeug der obengenannten Art zur Verfügung zu stellen, mit dem ein höherer Bohrfortschritt und kreisrunde Bohrlöcher erzielt werden können.The invention is therefore based on the object of a drilling tool of the type mentioned above, with which higher drilling progress and circular holes can be.
Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß die beiden von der Bohrerspitze ausgehenden Seiten der Hauptschneidplatte unterschiedliche Längen aufweisen, wobei die lange Seite über die Umfangskontur des Grundkörpers hinausragt, die Primärschneide sich über mindestens die lange Seite der Hauptschneidplatte und die Sekundärschneide sich über im wesentlichen die verbleibende Länge der Hauptschneidplatte radial erstreckt und die radial äußeren Enden der Zusatzschneiden auf demselben Rotationskreis wie das radial äußere Ende der Primärschneide liegen und gemeinsam den Nennbohrdurchmesser bestimmen, während das radial äußere Ende der Sekundärschneide radial nach innen zurückliegt, sowie die Zusatzschneiden zumindest auf einem Teil ihrer Schneidlängen in Bohrvorschubrichtung über die Sekundärschneide vor- und hinter der Primärschneide zurückstehen.According to the invention this object is achieved in that the both sides of the Main insert have different lengths, whereby the long side over the circumferential contour of the base body protrudes, the primary cutting edge extends over at least the long one Side of the main insert and the secondary cutting edge itself over essentially the remaining length of the Main cutting insert extends radially and the radially outer Ends of the additional cutting edges on the same rotating circle as that radially outer end of the primary cutting edge and together the Determine nominal drilling diameter while the radially outer end the secondary cutting edge lies radially inward, as well as the Additional cutting on at least part of their cutting lengths Advance in the direction of drilling feed over the secondary cutting edge stand behind the primary cutting edge.
Günstigerweise ist der axiale Versatz der Sekundärschneide zu der Primärschneide in Abhängigkeit von den Werkstoffeigenschaften des zu bohrenden Materials gewählt.The axial offset of the secondary cutting edge is advantageously increased the primary cutting edge depending on the material properties of the material to be drilled.
Dabei ist die Sekundärschneide günstigerweise um näherungsweise 0,3 bis 1,5 mm gegenüber der Primärschneide zurückgesetzt.The secondary cutting edge is advantageously approximately Set back 0.3 to 1.5 mm from the primary cutting edge.
Weiterhin ist vorzugsweise vorgesehen, daß die Länge der Sekundärschneide in Abhängigkeit von den Werkstoffeigenschaften des zu bohrenden Materials gewählt ist. Furthermore, it is preferably provided that the length of the secondary cutting edge depending on the material properties of the material to be drilled is selected.
Dabei kann vorgesehen sein, daß das radial äußere Ende der kurzen Seite der Hauptschneidplatte mit Sekundärschneide über die Umfangskontur des Grundkörpers hinausragt.It can be provided that the radially outer end of the short side of the main insert with secondary cutting edge the circumferential contour of the base body protrudes.
Andererseits kann auch vorgesehen sein, daß das radial äußere Ende der kurzen Seite der Hauptschneidplatte mit Sekundärschneide über die Umfangskontur des Grundkörpers nicht hinausragt.On the other hand, it can also be provided that the radially outer End of the short side of the main insert with secondary cutting edge does not protrude beyond the circumferential contour of the base body.
Dabei kann insbesondere vorgesehen sein, daß das radiale äußere Ende der kurzen Seite der Hauptschneidplatte mit Sekundärschneide von der Umfangskontur des Grundkörpers radial nach innen eingezogen ist.It can in particular be provided that the radial outer end of the short side of the main insert with secondary cutting edge radially from the circumferential contour of the base body moved in.
Vorzugsweise ist vorgesehen, daß die Primärschneide sich über 5/8 bis 3/4 des Nennbohrdurchmessers erstreckt.It is preferably provided that the primary cutting edge overlaps 5/8 to 3/4 of the nominal drilling diameter extends.
Weiterhin beträgt der Winkel zwischen der jeweiligen Zusatzschneide und der Hauptschneidplatte vorzugsweise 20° bis 70°. Furthermore, the angle between the respective additional cutting edge is and the main insert preferably 20 ° to 70 °.
Darüber hinaus kann vorgesehen sein, daß der Winkel (α) zwischen der jeweiligen Zusatzschneide und der Hauptschneidplatte in Abhängigkeit von dem anfallenden Bohrmehlvolumen gewählt ist.In addition, it can be provided that the angle (α) between the respective additional cutting edge and the main insert selected depending on the volume of drilling dust is.
Ferner kann vorgesehen sein, daß in Drehrichtung vor den Zusatzschneiden Bohrmehlnuten angeordnet sind.It can also be provided that in the direction of rotation before the additional cutting edges Bohrmehlnuten are arranged.
Darüber hinaus kann vorgesehen sein, daß zusätzliche Bohrmehlnuten hinter den Zusatzschneiden angeordnet sind.In addition, it can be provided that additional drilling dust grooves are arranged behind the additional cutting edges.
Auch kann vorgesehen sein, daß der Querschnitt der Bohrmehlnuten in Abhängigkeit von der anfallenden Menge an zerspantem Bohrmehl pro Zeit gewählt ist.It can also be provided that the cross section of the drilling dust grooves depending on the amount of machined Drilling dust per time is selected.
In einer besonderen Ausführungsform der Erfindung kann vorgesehen sein, daß die Zusatzschneiden Stifte umfassen.In a special embodiment of the invention can be provided be that the additional cutting edges include pins.
Schließlich kann vorgesehen sein, daß das Bohrwerkzeug eine Förderwendel aufweist.Finally, it can be provided that the drilling tool Has funding.
Der Erfindung liegt die überraschende Erkenntnis zugrunde, daß durch die erfindungsgemäße Gestaltung des Bohrwerkzeugs mit mindestens vier Schneiden, von denen jedoch nur drei Schneiden die Kontur des Bohrloches bestimmen, geometrisch runde Bohrlöcher erzielt werden, da ein Kreis durch drei Punkte geometrisch nicht überbestimmt wird.The invention is based on the surprising finding that by the inventive design of the drilling tool at least four cutting edges, of which only three cutting edges determine the contour of the borehole, geometrically round boreholes be achieved because a circle is geometric through three points is not overdetermined.
Darüber hinaus führen diese drei radial äußeren Punkte zu einer gegenüber einem Vierschneider reduzierten Reibung. Die Passivkraftverteilung der gewählten Hauptschneidplattengeometrie gewährleistet eine seitliche Anlage der Zusatzschneiden in der Bohrungswandung.In addition, these three radially outer points lead to one compared to a four-knife reduced friction. The Passive force distribution of the selected main insert geometry ensures that the additional cutting edges lie on the side in the bore wall.
Gegenüber einem zweischneidigen Werkzeug mit einer durchgehenden Schneidplatte sind bei der gewählten Form im Bereich der höheren Umfangsgeschwindigkeit bzw. des längeren Weges mehrere Schneiden im Einsatz. Somit reduziert sich der Schneidenverschleiß pro Schneide.Compared to a double-edged tool with a continuous one The insert is in the range of the selected shape higher peripheral speed or the longer distance several Cutting in use. This reduces cutting edge wear per cutting edge.
Weitere Merkmale und Vorteile der Erfindung ergeben sich anhand der Ansprüche und der nachstehenden Beschreibung, in der ein Ausführungsbeispiel der vorliegenden Erfindung anhand der beigefügten Zeichnungen erläutert ist.Further features and advantages of the invention can be seen from the following of the claims and the description below, in which an embodiment of the present invention based on the attached drawings is explained.
Dabei zeigt:
- Fig. 1
- eine Aufsicht auf die Stirnflächen eines Bohrwerkzeuges gemäß der vorliegenden Erfindung; und
- Fig. 2
- einen Randbereich des Bohrwerkzeuges von Fig. 1 im Detail.
- Fig. 1
- a plan view of the end faces of a drilling tool according to the present invention; and
- Fig. 2
- an edge region of the drilling tool of FIG. 1 in detail.
Fig. 1 zeigt eine Aufsicht auf die Stirnseite eines Bohrwerkzeugs
gemäß der vorliegenden Erfindung. In einem
Grundkörper 10 ist eine Hauptschneidplatte 12 angeordnet,
die eine in der Bohrerachse liegende Bohrerspitze 14 bildet
und zu beiden Seiten im wesentlichen dachförmig geneigt
ausgebildet ist. Symmetrisch zu der Hauptschneidachse
16 auf der Hauptschneidplatte 12 sind zwei Zusatzschneiden
18 unter einem Winkel a von 60° angeordnet, deren
Schneidachsen die Hauptschneidachse 16 in der Bohrerachse
des Bohrkopfes schneiden. Zwischen der Hauptschneidplatte
12 und den Zusatz schneiden 18 befinden sich
Bohrmehlnuten 20.Fig. 1 shows a top view of the end face of a drilling tool
according to the present invention. In one
Die Hauptschneidplatte 12 weist von der Bohrerspitze 14
ausgehend eine lange Seite 22, die über die Umfangskontur
des Grundkörpers 10 hinausragt, und eine kurze Seite 24
auf, die zwar über auch die Umfangskontur des Grundkörpers
hinausragt, aber bezogen auf die Mittelachse des Werkzeuges
kürzer als die lange Seite 22 ist. Die Hauptschneidplatte
12 weist eine Primärschneide 26 auf, die sich über
5/8 des Nennbohrdurchmessers, d.h. über die lange Seite 22
und über einen Teil der kurzen Seite 24 zusammenhängend
erstreckt, und eine Sekundärschneide 28 auf, die sich über
die verbleibende Länge der kurzen Seite 24 erstreckt.The
Die erfindungsgemäße Hauptschneidplatte, die grundsätzlich
die Hauptführungsarbeit und den wesentlichen Teil der Meißelwirkung
übernimmt, weist aufgrund der Verkürzung der
wirksamen Schneidlänge (bei gleichem Bohrdurchmesser) gegenüber
einem Bohrwerkzeug nach dem Stand der Technik einen
deutlich höheren Gesteinsabtragsquotienten auf, wodurch
das Bohrwerkzeug deutlich schneller arbeitet.
Die radial äußeren Enden der Zusatz schneiden 18 liegen auf
demselben Rotationskreis mit einem Durchmesser D1, der dem
Nennbohrdurchmesser des Bohrwerkzeugs entspricht, wie das
radial äußere Ende der Primärschneide 26.The main cutting insert according to the invention, which basically takes over the main guiding work and the essential part of the chiseling effect, has a significantly higher rock removal ratio due to the shortening of the effective cutting length (with the same drilling diameter) compared to a drilling tool according to the prior art, whereby the drilling tool works much faster. The radially outer ends of the
Figur 2 zeigt einen Randbereich des Bohrwerkzeugs von Figur
1 im Detail. Dieser Randbereich umfaßt einen Teil der
kurzen Seite 24 der Hauptschneidplatte 12 und eine der
zwei Zusatzschneiden 18. Die Primärschneide 26 erstreckt
sich über die lange Seite 22 und einen Teil der kurzen
Seite 24 über insgesamt 5/8 des Nennbohrdurchmessers D1.
Daran schließt sich die Sekundärschneide 28 an, wobei diese
gegenüber der Primärschneide 26 in axialer Richtung
entgegen der Bohrvorschubrichtung V zurückgesetzt ist und
ihr radiales äußeres Ende gegenüber dem radial äußeren
Ende der Primärschneide 26 zurückliegt. Die Zusatzschneiden
18 umfassen Schneidplatten, deren Schneiden 19 bei der
hier dargestellten Ausführungsform im wesentlichen parallel
zu den Schneiden der Primärschneide 26 und der Sekundärschneide
28 ausgerichtet sind, jedoch in Bohrvorschubrichtung
V über die Sekundärschneide 28 vorstehen und hinter
der Primärschneide 26 zurückstehen. Bei Sonderformen
der Schneide, wie Stiften mit Kegel oder Kegelstumpf und
dergleichen, soll der Verlauf der Schneide zwischen der
Primärschneide 26 und der Sekundärschneide 28 liegen.Figure 2 shows an edge region of the drilling tool of Figure
1 in detail. This edge area comprises part of the
Ein derartiger Schneider mit vier oder mehr Schneiden liefert
kreisrunde Bohrlöcher, da gegenüber einem herkömmlichen
Vierschneider nur drei Punkte, nämlich die radial
äußeren Enden der Primärschneide 26 und der Zusatzschneiden
18, verwendet werden, um ein kreisrundes Bohrloch zu
liefern.Such a cutter with four or more cutting edges delivers
circular drill holes as compared to a conventional one
Vierschneider only three points, namely the radial
outer ends of the
Die vorzugsweise geeigneten Werte von 0,3 bis 1,5 mm für
das Zurücksetzen der Sekundärschneide 28 gegenüber der
Primärschneide 26 ergeben sich gesteinsspezifisch anhand
des derzeit üblichen Bohrfortschrittes.The preferably suitable values from 0.3 to 1.5 mm for
the resetting of the
Claims (15)
- A drilling tool with a drilling head with an end face pointing in the direction of advance, which comprises a main cutting plate which forms a drill tip lying on the drill axis and which is constructed so as to be inclined substantially in the form of a roof on both sides, at least two additional cutting edges which are arranged substantially symmetrically at an angle to the main cutting axis and the cutting axes of which intersect the main cutting axis on the drill axis of the drilling head, and chip removal grooves, the main cutting plate (12) having a primary cutting edge (26) which extends radially over at least one side (22) of the main cutting plate (12) and a secondary cutting edge (28) which extends radially over substantially the remaining length of the main cutting plate (12) and is set back axially in the opposite direction to the direction of advance relative to the primary cutting edge (26) by at least the drill advance in millimetres per revolution, characterised in that the two sides (22, 24) of the main cutting plate (12) radiating from the drill tip (14) have different lengths, the long side (22) projecting beyond the peripheral contour of the base member (10), the primary cutting edge (26) extending radially over at least the long side (22) of the main cutting plate (12) and the secondary cutting edge (28) extending radially over substantially the remaining length of the main cutting plate (12) and the radially outer ends of the additional cutting edges lie on the same circle of rotation as the radially outer end of the primary cutting edge (26) and jointly define the nominal drill diameter, while the radially outer end of the secondary cutting edge (28) is set back radially inwards, and the additional cutting edges (18) are set back over at least a part of their cutting lengths in the drilling advance direction over the secondary cutting edge (28) in front of and behind the primary cutting edge (26).
- A drilling tool according to claim 1,
characterised in that the axial offset of the secondary cutting edge (28) relative to the primary cutting edge (26) is chosen in dependence on the properties of the material for drilling. - A drilling tool according to claim 1 or 2,
characterised in that the secondary cutting edge (28) is set back by approximately 0.3 to 1.5 mm relative to the primary cutting edge (26). - A drilling tool according to any one of the preceding claims, characterised in that the length of the secondary cutting edge (28) is selected in dependence on the properties of the material for drilling.
- A drilling tool according to any one of the preceding claims, characterised in that the radially outer end of the short side (24) of the main cutting plate (12) with the secondary cutting edge (28) projects beyond the peripheral contour of the base member.
- A drilling tool according to any one of claims 1 to 4, characterised in that the radially outer end of the short side (24) of the main cutting plate (12) with the secondary cutting edge (28) does not project beyond the peripheral contour of the base member (10).
- A drilling tool according to claim 6,
characterised in that the radially outer end of the short side (24) of the main cutting plate (12) with the secondary cutting edge (28) is set radially inwards from the peripheral contour of the base member (10). - A drilling tool according to any one of the preceding claims, characterised in that the primary cutting edge (26) extends over 5/8 to 3/4 of the nominal drill diameter.
- A drilling tool according to any one of the preceding claims, characterised in that the angle (α) between the respective additional cutting edge (18) and the main cutting edge (12) is preferably 20° to 70°.
- A drilling tool according to any one of the preceding claims, characterised in that the angle (α) between the respective additional cutting edge (18) and the main cutting plate (12) is selected in dependence on the chip volume occurring.
- A drilling tool according to any one of the preceding claims, characterised in that chip removal grooves (22) are disposed in front of the additional cutting edges (18) as considered in the direction of rotation.
- A drilling tool according to claim 11,
characterised in that additional chip removal grooves (20) are disposed behind the additional cutting edges (18). - A drilling tool according to any one of the preceding claims, characterised in that the cross-section of the chip removal grooves (20) is selected in dependence on the quantity of drilling chips per unit of time.
- A drilling tool according to any one of the preceding claims, characterised in that the additional cutting edges (18) comprise pins or the like.
- A drilling tool according to any one of the preceding claims, characterised in that the drilling tool has a feed helix.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19516270 | 1995-05-09 | ||
| DE19516270A DE19516270C1 (en) | 1995-05-09 | 1995-05-09 | Drilling tool |
| PCT/DE1996/000868 WO1996035856A1 (en) | 1995-05-09 | 1996-05-08 | Drilling tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0824626A1 EP0824626A1 (en) | 1998-02-25 |
| EP0824626B1 true EP0824626B1 (en) | 2000-01-12 |
Family
ID=7761000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96914085A Expired - Lifetime EP0824626B1 (en) | 1995-05-09 | 1996-05-08 | Drilling tool |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6032750A (en) |
| EP (1) | EP0824626B1 (en) |
| AT (1) | ATE188760T1 (en) |
| DE (2) | DE19516270C1 (en) |
| DK (1) | DK0824626T3 (en) |
| WO (1) | WO1996035856A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19807394A1 (en) * | 1998-02-21 | 1999-08-26 | Hilti Ag | Drilling and / or chisel tools |
| DE19811887A1 (en) * | 1998-03-18 | 1999-09-23 | Plica Werkzeugfabrik Ag Mollis | Hammer drilling tool |
| DE19827536A1 (en) | 1998-06-20 | 1999-12-23 | Hilti Ag | Drilling tool |
| DE29901296U1 (en) | 1999-01-26 | 1999-06-10 | Plica Werkzeugfabrik Ag | Drilling tool |
| DE19942986A1 (en) * | 1999-09-09 | 2001-03-15 | Hilti Ag | Drilling tool |
| DE10024433A1 (en) | 2000-05-19 | 2001-11-29 | Hawera Probst Gmbh | Rock drill |
| US7028790B2 (en) * | 2003-09-19 | 2006-04-18 | Jack Moore Associates, Inc. | Rotary drill bit |
| DE10351183A1 (en) | 2003-11-03 | 2005-06-02 | Illinois Tool Works Inc., Glenview | rock drill |
| DE102008054869B4 (en) * | 2008-12-18 | 2010-09-02 | Hilti Aktiengesellschaft | Drilling head for rock drills |
| CN106907112B (en) * | 2017-05-05 | 2023-06-20 | 宜昌神达科技有限公司 | PDC drill bit for well drilling |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2567084A (en) * | 1947-05-23 | 1951-09-04 | Termite Drills Inc | Bit |
| US2673714A (en) * | 1950-08-05 | 1954-03-30 | John M Hargrave | Rock or masonry drill |
| GB961449A (en) * | 1962-03-19 | 1964-06-24 | Ass Elect Ind | Improvements relating to drills |
| DE2348874A1 (en) * | 1973-09-28 | 1975-04-10 | Heinrich B Schaefers | Hard metal tip rock drill - has tip, guide ring and lands all hardened and removable for replacement |
| DE2912394A1 (en) * | 1979-03-29 | 1980-10-09 | Guergen Karl Heinz | Masonry bit for impact drill - has cruciform tungsten carbide insert with shorter cutting edges along one axis |
| DE2952296A1 (en) * | 1979-12-24 | 1981-06-25 | Karlheinz 2110 Buchholz Guergen | Rock drilling machine tool - has cutting plates offset vertically and set back progressively from leading plate |
| DE8337306U1 (en) * | 1983-12-24 | 1984-04-05 | Zitterbart, Heinz, 3436 Hessisch Lichtenau | SPIRAL DRILL FOR A HAND DRILLING MACHINE, ESPECIALLY FOR DRILLING STONE, MARBLE, ARTIFICIAL STONE OR THE LIKE. |
| US4727946A (en) * | 1984-10-26 | 1988-03-01 | Nl Industries, Inc. | Rotary drill bits |
| DE3707798A1 (en) * | 1987-03-11 | 1988-09-22 | Hawera Probst Kg Hartmetall | ROCK DRILL |
| US4787464A (en) * | 1987-11-13 | 1988-11-29 | Gte Products Corporation | Variable rake mine tool insert and method of use |
| DE3742661A1 (en) * | 1987-12-16 | 1989-07-13 | Hawera Probst Kg Hartmetall | ROCK DRILL |
| DE3820695C2 (en) * | 1988-06-18 | 1996-07-25 | Hawera Probst Kg Hartmetall | Rock drill |
| DE3834675A1 (en) * | 1988-10-12 | 1990-04-19 | Hawera Probst Kg Hartmetall | DRILLING TOOL |
| DE3919264C2 (en) * | 1989-06-13 | 1997-01-23 | Duss Maschf | Rotary impact drill for a hand-operated drill |
| JPH04201106A (en) * | 1990-11-30 | 1992-07-22 | Masao Kubota | Drill |
| DE4303590C5 (en) * | 1993-02-08 | 2007-11-22 | Drebo Werkzeugfabrik Gmbh | rock drill |
| DE4306981A1 (en) * | 1993-03-05 | 1994-09-08 | Keil Werkzeugfabrik Karl Eisch | Drill for rock or the like |
-
1995
- 1995-05-09 DE DE19516270A patent/DE19516270C1/en not_active Expired - Fee Related
-
1996
- 1996-05-08 DE DE59604177T patent/DE59604177D1/en not_active Expired - Lifetime
- 1996-05-08 EP EP96914085A patent/EP0824626B1/en not_active Expired - Lifetime
- 1996-05-08 AT AT96914085T patent/ATE188760T1/en not_active IP Right Cessation
- 1996-05-08 DK DK96914085T patent/DK0824626T3/en active
- 1996-05-08 WO PCT/DE1996/000868 patent/WO1996035856A1/en active IP Right Grant
- 1996-05-08 US US08/945,677 patent/US6032750A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DK0824626T3 (en) | 2000-05-29 |
| DE59604177D1 (en) | 2000-02-17 |
| DE19516270C1 (en) | 1997-01-30 |
| ATE188760T1 (en) | 2000-01-15 |
| WO1996035856A1 (en) | 1996-11-14 |
| US6032750A (en) | 2000-03-07 |
| EP0824626A1 (en) | 1998-02-25 |
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