WO2004013450A1 - Drill, in particular masonry drill - Google Patents

Drill, in particular masonry drill Download PDF

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Publication number
WO2004013450A1
WO2004013450A1 PCT/AT2003/000222 AT0300222W WO2004013450A1 WO 2004013450 A1 WO2004013450 A1 WO 2004013450A1 AT 0300222 W AT0300222 W AT 0300222W WO 2004013450 A1 WO2004013450 A1 WO 2004013450A1
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WO
WIPO (PCT)
Prior art keywords
drill
cutting
cutting edges
tip
angle
Prior art date
Application number
PCT/AT2003/000222
Other languages
German (de)
French (fr)
Inventor
Ronald Huber
Original Assignee
Ceratizit Austria Aktiengesellschaft
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 Ceratizit Austria Aktiengesellschaft filed Critical Ceratizit Austria Aktiengesellschaft
Priority to AU2003281844A priority Critical patent/AU2003281844A1/en
Priority to US10/533,559 priority patent/US20060118341A1/en
Priority to EP03739852A priority patent/EP1527252A1/en
Publication of WO2004013450A1 publication Critical patent/WO2004013450A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/02—Twist drills
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
    • E21B10/445—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts percussion type, e.g. for masonry
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2226/00—Materials of tools or workpieces not comprising a metal
    • B23B2226/75—Stone, rock or concrete
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/18—Configuration of the drill point
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2251/00—Details of tools for drilling machines
    • B23B2251/50—Drilling tools comprising cutting inserts

Definitions

  • the invention relates to a drill, in particular a rock drill with an elongated shaft and a cutting plate with roof edges inclined at one end, each cutting edge being contiguous due to the abutting of a rake face lying in front of the cutting edge in the direction of rotation of the drill and an open surface lying behind the cutting edge in the direction of rotation of the drill , which each enclose a wedge angle ⁇ with one another, and the cutting plate in the center region of the drill has a centering tip which is offset from the edge regions and in which the cutting edges are set back in the direction of rotation with respect to the cutting edges of the edge regions.
  • US 2,879,036 and EP 0 761 927 describe such drills with cutting plates in which the centering tip is stepped away from the edge regions.
  • the cutting edges of the centering tip and the cutting edges of the edge regions are at the same height with respect to the direction of rotation and each have a rake angle of 90 °.
  • the cutting edges of the centering tip are set back in relation to the cutting edges of the edge regions with respect to the direction of rotation.
  • the rake surfaces of the cutting edges of the centering point have a rake angle ⁇ which is in the range from 50 ° to 60 °, while their free surfaces have a clearance angle ⁇ in the range from 30 ° to 40 °. This results in a wedge angle ⁇ between 80 ° and 100 °.
  • a centering tip is robust and suitable for chiseling, but it has only bad ones
  • the object of the present invention is to provide a drill, in particular a stone drill with a centering tip, which in addition to good chisel properties also has good cutting properties. According to the invention, this is achieved in that the cutting edges of the centering tip have a rake angle ⁇ in the range from 70 ° to 90 ° and a wedge angle ⁇ in the range from 50 ° to 70 °, at least in the area immediately adjacent to the cutting edges.
  • Rake angle ⁇ a good cutting action of the centering tip is achieved without surprisingly no deterioration of the chiseling action of the centering tip and without the wear of the centering tip, which is particularly highly stressed in the center area, reaching a level which would undesirably reduce the service life of the drill.
  • a particularly good centering and drilling effect is achieved when the cutting edges are set back about a third of the thickness of the cutting plate and run parallel to the cutting edges of the edge areas.
  • the width of the centering tip b is in the range of 25% - 50% of the drill diameter d.
  • the good drilling effect of the drill according to the invention can also be further improved in that the envelope of the cutting edges of the centering tip is offset from the envelope of the cutting edges of the edge sections in the drill center by a certain distance a in the direction of the drill axis.
  • a distance a in the order of 10% to 15% of the drill diameter has proven itself.
  • the tip angle ⁇ i of the cutting edges of the centering tip is smaller than the tip angle ⁇ 2 of the cutting edges of the edge sections.
  • the tip angle ⁇ i is advantageously approximately 130 °, while the tip angle ⁇ 2 is approximately 150 °. It is also advantageous if the rake faces of the cutting edges
  • Centering tip have a flat area directly adjacent to the cutting edges, which merges into curved surfaces that run out centrally and downwards, the flat area having a rake angle ⁇ of approximately 90 °. In this way, a particularly good removal of the processed material is achieved.
  • Fig. 1 is a perspective view of the drill head of a drill according to the invention
  • Fig. 2 shows the drill head of FIG. 1 in a front view perpendicular to the main cutting edges
  • Fig. 3 shows the drill head of FIG. 1 in plan view
  • FIG. 5 the cutting plate of the drill head according to FIG. 3 in section BB
  • the drill -1- has an elongated shaft -15-, only partially shown, with helically twisted grooves -16-, for removing the drilled out material.
  • the direction of rotation of the drill around the axis of rotation D is indicated by the arrow -17-.
  • the end of the shaft -15- is provided with a slot transversely to the axis of rotation D of the drill -1-, into which a carbide cutting plate -2- is soldered with a somewhat circumferential projection.
  • the cutting plate -2- has a centering tip with two roof-shaped adjoining cutting edges -4-4'-, as well as edge sections adjacent to the centering tip with roof-shaped inclined cutting edges -3-3 '.
  • the cutting edges -4-4 'of the centering point enclose a tip angle ⁇ i of 130 ° with one another, while the cutting edges -3-3'- of the edge sections enclose a tip angle ⁇ of 150 ° with one another.
  • the cutting edges -3-3'- of the edge areas are formed by the abutment of the rake faces -5-5'- and the flank faces -7-7 ', including a wedge angle ⁇ of 50 °.
  • the rake angle ⁇ is 90 °.
  • the cutting edges -4-4 'of the centering point are in relation to the The direction of rotation of the drill relative to the cutting edges -3-3'- is reset by a third of the insert thickness s and is formed by the adjoining rake faces -6-6'- and the flank faces -8-8 '.
  • the rake faces -6-6'- each have a flat area -11-11'- directly adjacent to the cutting edges -4-4'-, which has a rake angle ⁇ of 90 °.
  • the flat area -11-11'- merges into a centrally extending curved surface -12-12 'and into a curved curved surface -13-13'-.
  • the envelope curve -9- of the cutting edges -4-4'- of the centering tip is offset from the envelope curve -10- of the cutting edges -3-3 'of the edge sections in the drill center by a distance a in the order of 14% of the drill diameter d.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Drilling Tools (AREA)

Abstract

The invention relates to a drill (1), in particular a masonry drill comprising an elongated shaft (15) and a cutting plate (2), one end of which has inclined cutting edges (3, 3'; 4, 4') that form a point. Each cutting edge (3, 3'; 4, 4') is formed by the abutment of a cutting face (5, 5'; 6, 6'), lying in front of the cutting edge (3, 3'; 4, 4') in the rotational direction (17) of the drill (1) and a flank (7, 7'; 8, 8'), lying behind the cutting edge (3, 3'; 4, 4') in the rotational direction (17) of the drill (1), each cutting face and flank respectively forming a wedge angle η. In the central region of the drill (1), the cutting plate (2) has a centring tip that is stepped in relation to the marginal regions, the cutting edges (4, 4') of said tip being set back in the rotational direction (17) in relation to the cutting edges (3, 3') of the marginal regions. The cutting edges (4, 4') of the centring tip have a cutting angle α ranging between 70° and 90° and a wedge angle η ranging between 50° and 70°, at least in the immediate vicinity of said edges (4, 4').

Description

BOHRER, INSBESONDERE STEINBOHRER DRILLS, ESPECIALLY STONE DRILLS
Die Erfindung betrifft einen Bohrer, insbesondere Steinbohrer mit einem länglichen Schaft und einer Schneidplatte mit dachförmig geneigten Schneidkanten an einem Ende, wobei jede Schneidkante durch das Aneinandergrenzen einer in Drehrichtung des Bohrers vor der Schneidkante liegenden Spanfläche und einer in Drehrichtung des Bohrers hinter der Schneidkante liegenden Freifläche, welche jeweils einen Keilwinkel γ miteinander einschließen, gebildet wird und wobei die Schneidplatte im Zentrumsbereich des Bohrers eine gegenüber den Randbereichen abgesetzte Zentrierspitze aufweist, bei der die Schneidkanten gegenüber den Schneidkanten der Randbereiche im Drehrichtung zurückgesetzt sind.The invention relates to a drill, in particular a rock drill with an elongated shaft and a cutting plate with roof edges inclined at one end, each cutting edge being contiguous due to the abutting of a rake face lying in front of the cutting edge in the direction of rotation of the drill and an open surface lying behind the cutting edge in the direction of rotation of the drill , which each enclose a wedge angle γ with one another, and the cutting plate in the center region of the drill has a centering tip which is offset from the edge regions and in which the cutting edges are set back in the direction of rotation with respect to the cutting edges of the edge regions.
Die US 2 879 036 sowie die EP 0 761 927 beschreiben beispielsweise derartige Bohrer mit Schneidplatten, bei denen die Zentrierspitze stufenförmig von den Randbereichen abgesetzt ist. Bei der Schneidplattenausführung gemäß der US 2 879 036 liegen die Schneidkanten der Zentrierspitze und die Schneidkanten der Randbereiche in Bezug auf die Drehrichtung auf gleicher Höhe und weisen jeweils einen Spanwinkel von 90° auf. Bei der Schneidplatte gemäß der EP 0 761 927 sind die Schneidkanten der Zentrierspitze gegenüber den Schneidkanten der Randbereiche in Bezug auf die Drehrichtung zurückversetzt. Die Spanflächen der Schneidkanten der Zentrierspitze weisen einen Spanwinkel α auf, der im Bereich von 50° bis 60° liegt, während ihre Freiflächen einen Freiwinkel ß im Bereich von 30° bis 40° aufweisen. Das ergibt einen Keilwinkel γ zwischen 80° und 100°. Eine derartige Zentrierspitze ist zwar robust und eignet sich zum Meißeln, sie besitzt jedoch nur schlechteUS 2,879,036 and EP 0 761 927, for example, describe such drills with cutting plates in which the centering tip is stepped away from the edge regions. In the cutting insert design according to US Pat. No. 2,879,036, the cutting edges of the centering tip and the cutting edges of the edge regions are at the same height with respect to the direction of rotation and each have a rake angle of 90 °. In the cutting insert according to EP 0 761 927, the cutting edges of the centering tip are set back in relation to the cutting edges of the edge regions with respect to the direction of rotation. The rake surfaces of the cutting edges of the centering point have a rake angle α which is in the range from 50 ° to 60 °, while their free surfaces have a clearance angle β in the range from 30 ° to 40 °. This results in a wedge angle γ between 80 ° and 100 °. Such a centering tip is robust and suitable for chiseling, but it has only bad ones
Schneideigenschaften, was insgesamt den Bohrfortschritt pro Zeiteinheit verringert.Cutting properties, which overall reduces the drilling progress per unit of time.
Die Aufgabe der vorliegenden Erfindung ist es, einen Bohrer insbesondere Steinbohrer mit Zentrierspitze zu schaffen, der neben guten Meißeleigenschaften auch gute Schneideigenschaften aufweist. Erfindungsgemäß wird dies dadurch erreicht, dass die Schneidkanten der Zentrierspitze zumindest im unmittelbar an die Schneidkanten angrenzenden Bereich einen Spanwinkel α im Bereich von 70° bis 90° und einen Keilwinkel γ im Bereich von 50° bis 70° aufweisen.The object of the present invention is to provide a drill, in particular a stone drill with a centering tip, which in addition to good chisel properties also has good cutting properties. According to the invention, this is achieved in that the cutting edges of the centering tip have a rake angle α in the range from 70 ° to 90 ° and a wedge angle γ in the range from 50 ° to 70 °, at least in the area immediately adjacent to the cutting edges.
Durch den schlanken Keilwinkel γ in Verbindung mit dem speziellenDue to the slim wedge angle γ in connection with the special
Spanwinkel α wird eine gute Schneidwirkung der Zentrierspitze erreicht, ohne dass überraschenderweise eine Verschlechterung der Meißelwirkung der Zentrierspitze auftritt und ohne dass der Verschleiß der insbesondere im Zentrumsbereich extrem beanspruchten Zentrierspitze ein Maß erreicht, welches die Standzeit des Bohrers in unerwünschter Weise herabsetzten würde.Rake angle α, a good cutting action of the centering tip is achieved without surprisingly no deterioration of the chiseling action of the centering tip and without the wear of the centering tip, which is particularly highly stressed in the center area, reaching a level which would undesirably reduce the service life of the drill.
Ein besonders guter Zentrier- und Anbohreffekt wird dann erreicht, wenn die Schneidkanten etwa ein Drittel der Stärke der Schneidplatte zurückgesetzt sind und parallel zu den Schneidkanten der Randbereiche verlaufen.A particularly good centering and drilling effect is achieved when the cutting edges are set back about a third of the thickness of the cutting plate and run parallel to the cutting edges of the edge areas.
Weiters ist es von Vorteil, wenn die Breite der Zentrierspitze b im Bereich von 25 % - 50 % vom Bohrerdurchmesser d liegt.It is also advantageous if the width of the centering tip b is in the range of 25% - 50% of the drill diameter d.
Der gute Anbohreffekt des erfindungsgemäßen Bohrers kann auch dadurch zusätzlich verbessert werden, dass die Hüllkurve der Schneidkanten der Zentrierspitze gegenüber der Hüllkurve der Schneidkanten der Randabschnitte im Bohrerzentrum mit einem bestimmten Abstand a in Richtung der Bohrerachse abgesetzt ist. Dabei hat sich ein Abstand a in der Größenordung von 10 % bis 15 % vom Bohrerdurchmesser bewährt.The good drilling effect of the drill according to the invention can also be further improved in that the envelope of the cutting edges of the centering tip is offset from the envelope of the cutting edges of the edge sections in the drill center by a certain distance a in the direction of the drill axis. A distance a in the order of 10% to 15% of the drill diameter has proven itself.
Ein weiterer positiver Effekt hinsichtlich guter Anbohrwirkung wird dadurch erzielt, dass der Spitzenwinkel δi der Schneidkanten der Zentrierspitze kleiner ist, als der Spitzenwinkel δ2 der Schneidkanten der Randabschnitte. Der Spitzenwinkel δi beträgt vorteilhafterweise etwa 130°, während der Spitzenwinkel δ2 etwa 150° beträgt. Von Vorteil ist es auch, wenn die Spanflächen der Schneidkanten derAnother positive effect with regard to good drilling effect is achieved in that the tip angle δi of the cutting edges of the centering tip is smaller than the tip angle δ 2 of the cutting edges of the edge sections. The tip angle δi is advantageously approximately 130 °, while the tip angle δ 2 is approximately 150 °. It is also advantageous if the rake faces of the cutting edges
Zentrierspitze einen unmittelbar an die Schneidkanten angrenzenden ebenen Bereich aufweisen, der in zentral und nach unten auslaufende kurvenförmige Flächen übergeht, wobei der ebene Bereich einen Spanwinkel α von etwa 90° aufweist. Auf diese Weise wird ein besonders guter Abtransport des abgearbeiteten Materials erreicht.Centering tip have a flat area directly adjacent to the cutting edges, which merges into curved surfaces that run out centrally and downwards, the flat area having a rake angle α of approximately 90 °. In this way, a particularly good removal of the processed material is achieved.
Im folgenden wird die Erfindung an Hand von Figuren näher erläutert.The invention is explained in more detail below with reference to figures.
Es zeigen;Show it;
Fig. 1 eine perspektivische Ansicht des Bohrerkopfes eines erfindungsgemäßen BohrersFig. 1 is a perspective view of the drill head of a drill according to the invention
Fig. 2 den Bohrerkopf nach Fig. 1 in Vorderansicht senkrecht zu den HauptschneidkantenFig. 2 shows the drill head of FIG. 1 in a front view perpendicular to the main cutting edges
Fig. 3 den Bohrerkopf nach Fig. 1 in DraufsichtFig. 3 shows the drill head of FIG. 1 in plan view
Fig. 4 die Schneidplatte des Bohrerkopfes nach Fig. 3 im Schnitt A - A Fig. 5 die Schneidplatte des Bohrerkopfes nach Fig. 3 im Schnitt B - B3 in section A - A. FIG. 5 the cutting plate of the drill head according to FIG. 3 in section BB
Entsprechend den Figuren 1 bis 3 weist der erfindungsgemäße Bohrer -1- einen, nur teilweise dargestellten, länglichen Schaft -15- mit wendeiförmig verdrallten Nuten -16-, zur Abfuhr des ausgebohrten Materials, auf. Die Drehrichtung des Bohrers um die Drehachse D ist durch den Pfeil -17- angedeutet. Zur Ausbildung des Bohrerkopfes ist das Ende des Schaftes -15- mit einem Schlitz quer zur Drehachse D des Bohrers -1- versehen, in den mit etwas umfangsseitigem Überstand eine Schneidplatte -2- aus Hartmetall eingelötet ist. Die Schneidplatte -2- weist eine Zentrierspitze mit zwei dachförmig aneinandergrenzende Schneidkanten -4-4'-, sowie an die Zentrierspitze angrenzende Randabschnitte mit dachförmig geneigten Schneidkanten -3-3' auf. Die Schneidkanten -4-4' der Zentrierspitze schließen miteinander einen Spitzenwinkel δi von 130° ein, während die Schneidkanten -3-3'- der Randabschnitte einen Spitzenwinkel δ von 150° miteinander einschließen. Die Schneidkanten -3-3'- der Randbereiche werden durch das Aneinandergrenzen der Spanflächen -5-5'- und der Freiflächen -7-7' unter Einschluss eines Keilwinkels γ von 50° gebildet. Der Spanwinkel α beträgt 90°. Die Schneidkanten -4-4' der Zentrierspitze sind in Bezug auf die Drehrichtung des Bohrers gegenüber den Schneidkanten -3-3'- um ein Drittel der Schneidplattenstärke s zurückgesetzt und werden durch das Aneinandergrenzen der Spanflächen -6-6'- und der Freiflächen -8-8' gebildet. Die Spanflächen -6-6'- weisen jeweils einen unmittelbar an die Schneidkanten -4-4'- angrenzenden ebenen Bereich -11-11'- auf, der einen Spanwinkel α von 90° aufweist. Der ebene Bereich -11-11'- geht in eine zentral auslaufende kurvenförmige Fläche -12-12' und in eine nach unten auslaufende kurvenförmige Fläche -13-13'- über. Die Hüllkurve -9- der Schneidkanten -4-4'- der Zentrierspitze ist gegenüber der Hüllkurve -10- der Schneidkanten -3-3' der Randabschnitte im Bohrerzentrum um einen Abstand a in der Größenordung von 14 % des Bohrerdurchmessers d abgesetzt.According to FIGS. 1 to 3, the drill -1- according to the invention has an elongated shaft -15-, only partially shown, with helically twisted grooves -16-, for removing the drilled out material. The direction of rotation of the drill around the axis of rotation D is indicated by the arrow -17-. To form the drill head, the end of the shaft -15- is provided with a slot transversely to the axis of rotation D of the drill -1-, into which a carbide cutting plate -2- is soldered with a somewhat circumferential projection. The cutting plate -2- has a centering tip with two roof-shaped adjoining cutting edges -4-4'-, as well as edge sections adjacent to the centering tip with roof-shaped inclined cutting edges -3-3 '. The cutting edges -4-4 'of the centering point enclose a tip angle δi of 130 ° with one another, while the cutting edges -3-3'- of the edge sections enclose a tip angle δ of 150 ° with one another. The cutting edges -3-3'- of the edge areas are formed by the abutment of the rake faces -5-5'- and the flank faces -7-7 ', including a wedge angle γ of 50 °. The rake angle α is 90 °. The cutting edges -4-4 'of the centering point are in relation to the The direction of rotation of the drill relative to the cutting edges -3-3'- is reset by a third of the insert thickness s and is formed by the adjoining rake faces -6-6'- and the flank faces -8-8 '. The rake faces -6-6'- each have a flat area -11-11'- directly adjacent to the cutting edges -4-4'-, which has a rake angle α of 90 °. The flat area -11-11'- merges into a centrally extending curved surface -12-12 'and into a curved curved surface -13-13'-. The envelope curve -9- of the cutting edges -4-4'- of the centering tip is offset from the envelope curve -10- of the cutting edges -3-3 'of the edge sections in the drill center by a distance a in the order of 14% of the drill diameter d.
Die Figuren stellen besonders vorteilhafte Ausgestaltungen der Erfindung dar. Die Erfindung ist jedoch keinesfalls darauf beschränkt. The figures represent particularly advantageous embodiments of the invention. However, the invention is in no way limited to this.

Claims

Patentansprüche claims
1. Bohrer (1 ), insbesondere Steinbohrer mit einem länglichen Schaft (15) und einer Schneidplatte (2) mit dachförmig geneigten Schneidkanten (3,3'; 4,4') an einem Ende, wobei jede Schneidkante (3,3'; 4,4') durch das Aneinandergrenzen einer in Drehrichtung (17) des Bohrers (1 ) vor der1. Drill (1), in particular stone drill with an elongated shaft (15) and a cutting plate (2) with roof-shaped inclined cutting edges (3,3 '; 4,4') at one end, each cutting edge (3,3 '; 4,4 ') by adjoining one in the direction of rotation (17) of the drill (1) in front of
Schneidkante (3,3'; 4,4') liegenden Spanfläche (5,5'; 6,6') und einer in Drehrichtung (17) des Bohrers (1) hinter der Schneidkante (3,3'; 4,4') liegenden Freifläche (7,7'; 8,8'), welche jeweils einen Keilwinkel γ miteinander einschließen, gebildet wird und wobei die Schneidplatte (2) im Zentrumsbereich des Bohrers (1 ), eine gegenüber den Randbereichen abgesetzte Zentrierspitze aufweist, bei der die Schneidkanten (4,4') gegenüber den Schneidkanten (3, 3') der Randbereiche in Drehrichtung (17) zurückgesetzt sind d a d u r c h g e k e n n z e i c h n e t, dass die Schneidkanten (4,4') der Zentrierspitze zumindest im unmittelbar an die Schneidkanten angrenzenden Bereich einen Spanwinkel α im Bereich von 70° bis 90° und einen Keilwinkel γ im Bereich von 50 ° bis 70° aufweisen.Cutting edge (3,3 '; 4,4') lying rake face (5,5 '; 6,6') and one in the direction of rotation (17) of the drill (1) behind the cutting edge (3,3 '; 4,4' ) lying free surface (7,7 '; 8,8'), which each enclose a wedge angle γ with each other, is formed and wherein the cutting plate (2) in the center region of the drill (1) has a centering tip offset from the edge regions, in which the cutting edges (4,4 ') are set back in relation to the cutting edges (3, 3') of the edge areas in the direction of rotation (17), characterized in that the cutting edges (4,4 ') of the centering tip have a rake angle α at least in the area directly adjacent to the cutting edges in the range from 70 ° to 90 ° and have a wedge angle γ in the range from 50 ° to 70 °.
2. Bohrer nach Anspruch 1 , dadurch gekennzeichnet, dass die2. Drill according to claim 1, characterized in that the
Schneidkanten (4,4') der Zentrierspitze etwa um ein Drittel der Stärke s der Schneidplatte (2) zurückgesetzt sind und parallel zu den Schneidkanten (3,3') der Randbereiche verlaufen.Cutting edges (4,4 ') of the centering point are set back by about a third of the thickness s of the cutting plate (2) and run parallel to the cutting edges (3,3') of the edge areas.
3. Bohrer nach einem der Ansprüche 1-2, dadurch gekennzeichnet, dass die Breite b der Zentrierspitze im Bereich von 25 % bis 50 % vom Bohrerdurchmesser d liegt.3. Drill according to one of claims 1-2, characterized in that the width b of the centering tip is in the range from 25% to 50% of the drill diameter d.
4. Bohrer nach einem der Ansprüche 1-3, dadurch gekennzeichnet, dass die Hüllkurve (9) der Schneidkanten (4,4') der Zentrierspitze gegenüber der4. Drill according to one of claims 1-3, characterized in that the envelope (9) of the cutting edges (4,4 ') of the centering point opposite the
Hüllkurve (10) der Schneidkanten (3,3') der Randabschnitte im Bohrerzentrum um einen Abstand a in Richtung der Bohrerachse abgesetzt ist. Envelope curve (10) of the cutting edges (3,3 ') of the edge sections in the drill center is offset by a distance a in the direction of the drill axis.
5. Bohrer nach Anspruch 4, dadurch gekennzeichnet, dass der Abstand a im Bereich von 10 % bis 15 % vom Bohrerdurchmesser d liegt.5. Drill according to claim 4, characterized in that the distance a is in the range of 10% to 15% of the drill diameter d.
6. Bohrer nach Anspruch 4, dadurch gekennzeichnet dass der Spitzenwinkel δi der Schneidkanten (4,4') der Zentrierspitze kleiner ist als der Spitzenwinkel δ2 der Schneidkanten (3,3') der Randabschnitte.6. Drill according to claim 4, characterized in that the tip angle δi of the cutting edges (4,4 ') of the centering tip is smaller than the tip angle δ 2 of the cutting edges (3,3') of the edge sections.
7. Bohrer nach Anspruch 6, dadurch gekennzeichnet, dass der Spitzenwinkel δi etwa 130° beträgt.7. Drill according to claim 6, characterized in that the tip angle δi is approximately 130 °.
8. Bohrer nach einem der Ansprüche 1-7, dadurch gekennzeichnet, dass der Spitzenwinkel δ2 etwa 150° beträgt.8. Drill according to one of claims 1-7, characterized in that the tip angle δ 2 is approximately 150 °.
9. Bohrer nach einem der Ansprüche 1-8, dadurch gekennzeichnet, dass die Spanflächen (6,6') der Schneidkanten (4,4') der Zentrierspitze einen unmittelbar an die Schneidkanten (4,4') angrenzenden ebenen9. Drill according to one of claims 1-8, characterized in that the rake faces (6,6 ') of the cutting edges (4,4') of the centering tip are directly adjacent to the cutting edges (4,4 ')
Bereich (11,11') aufweisen, der in zentral und nach unten auslaufende kurvenförmige Flächen (12,12'; 13,13') übergeht, wobei der ebene Bereich (11 ,11') einen Spanwinkel α von etwa 90° aufweist und der Keilwinkel γ etwa 60° beträgt.Have area (11, 11 ') which merges into curved and curved surfaces (12, 12'; 13, 13 '), the flat area (11, 11') having a rake angle α of about 90 ° and the wedge angle γ is approximately 60 °.
10. Schneidplatte zur Verwendung in einem Bohrer nach einem der Ansprüche 1 bis 9. 10. Cutting insert for use in a drill according to one of claims 1 to 9.
PCT/AT2003/000222 2002-08-06 2003-08-01 Drill, in particular masonry drill WO2004013450A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2003281844A AU2003281844A1 (en) 2002-08-06 2003-08-01 Drill, in particular masonry drill
US10/533,559 US20060118341A1 (en) 2002-08-06 2003-08-01 Drill in particular masonry drill
EP03739852A EP1527252A1 (en) 2002-08-06 2003-08-01 Drill, in particular masonry drill

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0052402U AT6617U1 (en) 2002-08-06 2002-08-06 DRILLS, ESPECIALLY STONE DRILLS
ATGM524/2002 2002-08-06

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WO2004013450A1 true WO2004013450A1 (en) 2004-02-12

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US (1) US20060118341A1 (en)
EP (1) EP1527252A1 (en)
AT (1) AT6617U1 (en)
AU (1) AU2003281844A1 (en)
WO (1) WO2004013450A1 (en)

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Also Published As

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EP1527252A1 (en) 2005-05-04
AT6617U1 (en) 2004-01-26
AU2003281844A1 (en) 2004-02-23
US20060118341A1 (en) 2006-06-08

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