EP0706870B1 - Tubular saw - Google Patents

Tubular saw Download PDF

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Publication number
EP0706870B1
EP0706870B1 EP95810465A EP95810465A EP0706870B1 EP 0706870 B1 EP0706870 B1 EP 0706870B1 EP 95810465 A EP95810465 A EP 95810465A EP 95810465 A EP95810465 A EP 95810465A EP 0706870 B1 EP0706870 B1 EP 0706870B1
Authority
EP
European Patent Office
Prior art keywords
carrier body
cross
cutouts
wall thickness
auger
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
Application number
EP95810465A
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German (de)
French (fr)
Other versions
EP0706870A1 (en
Inventor
Werner Kleine
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Hilti AG
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Hilti AG
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Filing date
Publication date
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Publication of EP0706870A1 publication Critical patent/EP0706870A1/en
Application granted granted Critical
Publication of EP0706870B1 publication Critical patent/EP0706870B1/en
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
    • B28D1/041—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S408/00—Cutting by use of rotating axially moving tool
    • Y10S408/703—Trepanning
    • 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
    • Y10T408/895—Having axial, core-receiving central portion

Definitions

  • the invention relates to a hollow drill bit with a hollow cylindrical carrier body, the end region on the drilling direction side having open recesses in the drilling direction, which serve to accommodate cutting bodies which project axially beyond the carrier body and on its inner and outer contours.
  • Hollow drill bits are used to produce large holes in components, such holes mostly being used to pass lines and the like.
  • Masonry, concrete, stone and the like come into consideration as material for the components.
  • the construction of the hollow drill bits is largely known per se and generally consists of a hollow cylindrical carrier body, the end region of which on the drilling direction side has open cutouts.
  • cutting bodies are arranged which serve to actually break down the material of the components to be machined.
  • the cutting bodies can consist of hard metal, polycrystalline diamond flakes, diamond cutting edges consisting of diamond grains which are embedded in matrix material and the like.
  • the connection between the cutting body and the carrier body can be made by soldering, welding or sintering connections.
  • these known hollow drill bits Due to the difference between the wall thickness of the carrier body and the dimension of the cutting body measured in the radial direction, these known hollow drill bits are only a relatively small connection area is available, which can be used for a soldered connection, for example. Since the hollow core bits are exposed to considerable stresses due to the torques which occur and any impact forces acting on them, the cutting bodies can become detached from the carrier body, so that the hollow core bit as a whole is unusable.
  • the entire end region of the carrier body on the drilling direction side is provided with a larger wall thickness all round, this larger wall thickness corresponding to the radially measured dimension of the cutting body.
  • the disadvantage of detaching the cutting bodies can thereby largely be remedied, but with the purchase of a further very significant disadvantage, namely the increase in the friction of the carrier body within the bore to be produced due to the circumferential end region with greater wall thickness.
  • a further hollow drill bit is known from US Pat. No. 3,308,689, in which the outer contour of the carrier body widens radially outward in the end region on the drilling direction side, so that the carrier body has an overall greater wall thickness at its free end on the drilling direction side.
  • This free end area on the drilling direction side is provided with a plurality of cut-outs for receiving a cutting body and a plurality of discharge grooves.
  • These removal grooves extend in the drilling direction over the entire extended, drilling direction end region of the carrier body and each open into one of the cutouts.
  • the base areas of these discharge grooves extend tangentially to the non-expanded outer contour of the carrier body. Since the extent of the cutouts in the circumferential direction of the carrier body is greater than the extent of the cutting bodies, only a part of each cutout is available as a connecting surface.
  • the invention has for its object to provide a hollow core bit, which on the one hand leads to high efficiency and on the other hand has a high life expectancy.
  • the object is achieved in that the carrier body of the hollow drill bit has cross-sectional reinforcements which are limited to the surrounding area of the recesses and which adjoin the recesses in the circumferential direction of the carrier body on both sides and counter to the drilling direction.
  • the cross-sectional reinforcements of the carrier body limited according to the invention to the surrounding area of the cutouts lead to such an enlargement of the connecting area that the cutting bodies are sufficiently held in the cutouts even under high loads.
  • Common, known measures such as soldering, welding or sintering connections are sufficient for the connection.
  • the partial cross-sectional reinforcements do not significantly increase the friction between the carrier body and the bore to be produced in the component, especially not in such a way that excessive heat is generated occurs. Because the cross-sectional reinforcements do not extend over the entire circumference of the carrier body, there is still sufficient space for the removal of the dismantled material. This also eliminates the risk of compression of the mined material, which can lead to a drop in performance.
  • the cross-sectional reinforcements can only project beyond the wall thickness of the support body, for example, only on the outer contour; this from the point of view that the greatest friction occurs on the outer contour and material that has largely been removed must also be removed on the outer contour.
  • the carrier body in such a way that the cross-sectional reinforcements project beyond the wall thickness only on the inner contour.
  • This application is suitable, for example, for hollow core bits, which are primarily used to produce shorter holes.
  • an optimal compromise can be to have both the inner contour and the outer contour of the carrier body protrude from the cross-sectional reinforcements.
  • the wall thickness of the carrier body in the area of the cross-sectional reinforcements expediently corresponds to 1.2 to 1.8 times the remaining wall thickness of the carrier body.
  • the cross-sectional reinforcements can be adapted to the respective application and the diameter ratio under consideration.
  • the distribution in the circumferential direction of the cross-sectional reinforcements is expediently symmetrical, based on the cutouts.
  • the dimension of the cross-sectional reinforcements measured in the axial direction is also advantageously matched to the respective applications.
  • the cross-sectional reinforcements expediently then extend at the base of the recesses counter to the drilling direction by an amount which corresponds to 0.5 to 1.4 times the width of the recesses measured in the circumferential direction of the carrier body
  • the carrier body 1 shows a hollow core bit according to the invention with carrier body 1 and cutting bodies 2. Contrary to the direction of drilling, the carrier body 1 is provided with a bottom 1a, which is penetrated by a threaded bore 1b, so that an adapter can be accommodated therein.
  • the cutting bodies 2 are arranged in recesses 1c of the carrier body 1.
  • the carrier body 1 has cross-sectional reinforcements 1d in the vicinity of these cutouts 1c.
  • the cross-sectional reinforcements 1d project beyond the wall thickness T of the carrier body 1 by way of example both on the inner and on the outer contour.
  • the wall thickness Q in the area of the cross-sectional reinforcements 1d is thus greater than the remaining wall thickness T of the carrier body 1, the wall thickness Q in the area of the cross-sectional reinforcements 1d corresponding substantially less to approximately the same as the radially measured dimension of the cutting bodies 2.
  • the cross-sectional reinforcements 1d in the circumferential direction of the carrier body 1 adjoin the cutouts 1c on both sides, namely by the dimension U measured in the circumferential direction of the carrier body 1.
  • This dimension U corresponds to a Proportion of the width B of the cutouts 1c measured in the circumferential direction.
  • the cross-sectional reinforcements 1d extend counter to the direction of drilling beyond the base of the recesses 1c, namely by the dimension G, as again shown in FIG. 1 and in particular in FIG. 2.
  • the carrier body 1 can be produced in various ways. However, non-cutting shaping is preferably used. There are also various possibilities for the connection between the carrier body 1 and the cutting body 2. However, a soldered connection is preferably used.

Abstract

The hollow body (1) contains recesses (1c) in its forward end open in the drilling direction in which cutters (2) are inserted, these protruding in the axial direction and also beyond the body surface on the inside and outside. The body has portions (1d) of increased cross-section (1d) adjacent to the cutter recesses. The cutter recesses can protrude beyond the body wall at the inside and/or outside. The wall thickness (Q) at these points can be between 1.2 and 1.8 times that of the remainder, while their length (U) either side of the recesses can be between 0.3 and 1 times that (B) of the recesses. At the base of each recess, the thickened portion can extend away from the working direction for a distance (G) equal to between 0.5 and 1.4 times the width (B).

Description

Die Erfindung betrifft eine Hohlbohrkrone mit einem hohlzylindrischen Trägerkörper, dessen bohrrichtungsseitiger Endbereich in Bohrrichtung offene Aussparungen aufweist, die der Aufnahme von Schneidkörpem dienen, welche den Trägerkörper axial sowie an seiner Innen- und Aussenkontur überragen.The invention relates to a hollow drill bit with a hollow cylindrical carrier body, the end region on the drilling direction side having open recesses in the drilling direction, which serve to accommodate cutting bodies which project axially beyond the carrier body and on its inner and outer contours.

Hohlbohrkronen dienen der Herstellung grosser Bohrungen in Bauteilen, wobei solche Bohrungen zumeist der Durchführung von Leitungen und dergleichen dienen. Als Material für die Bauteile kommt Mauerwerk, Beton, Gestein und dergleichen in Betracht.Hollow drill bits are used to produce large holes in components, such holes mostly being used to pass lines and the like. Masonry, concrete, stone and the like come into consideration as material for the components.

Der Aufbau der Hohlbohrkronen ist an sich weitgehend bekannt und besteht in der Regel aus einem hohlzylindrischen Trägerkörper, dessen bohrrichtungsseitiger Endbereich offene Aussparungen aufweist. In diesen offenen Aussparungen sind Schneidkörper angeordnet, die dem eigentlichen Abbau des Materials der jeweils zu bearbeitenden Bauteile dienen. Die Schneidkörper können aus Hartmetall, polykristallinen Diamantplättchen, Diamantschneiden bestehend aus Diamantkömem, die in Matrixmaterial eingelagert sind und dergleichen bestehen. Die Verbindung zwischen den Schneidkörpem und dem Trägerkörper kann über Löt-, Schweiss- oder Sinterverbindungen erfolgen.The construction of the hollow drill bits is largely known per se and generally consists of a hollow cylindrical carrier body, the end region of which on the drilling direction side has open cutouts. In these open recesses, cutting bodies are arranged which serve to actually break down the material of the components to be machined. The cutting bodies can consist of hard metal, polycrystalline diamond flakes, diamond cutting edges consisting of diamond grains which are embedded in matrix material and the like. The connection between the cutting body and the carrier body can be made by soldering, welding or sintering connections.

Zur Gewährleistung, dass das abgebaute Material der Bauteile abgeführt werden kann und die Reibung des Trägerkörpers innerhalb der herzustellenden Bohrung nicht zu gross wird, sind bei den bekannten Hohlbohrkronen Massnahmen vorgesehen, die zu einem Ringspalt zwischen Trägerkörper und Bohrung im Bauteil führen. Dazu ist es bekannt, das in radialer Richtung gemessene Mass der Schneidkörper etwas grösser zu wählen, als die Wandstärke des Trägerkörpers, so dass die Schneidkörper die Innenund Aussenkontur des Trägerkörpers überragen. Eine solche Hohlbohrkrone ist beispielsweise aus der DE-OS 39 30 250 bekannt.To ensure that the degraded material of the components can be removed and the friction of the carrier body within the bore to be produced does not become too great, measures are provided in the known hollow core bits that lead to an annular gap between the carrier body and the bore in the component. For this purpose, it is known to choose the dimension of the cutting bodies measured in the radial direction to be somewhat larger than the wall thickness of the carrier body, so that the cutting bodies project beyond the inner and outer contours of the carrier body. Such a hollow core bit is known for example from DE-OS 39 30 250.

Aufgrund der Differenz zwischen Wandstärke des Trägerkörpers und dem in radialer Richtung gemessenen Mass der Schneidkörper steht bei diesen bekannten Hohlbohrkronen nur eine relativ kleine Verbindungsfläche zur Verfügung, welche beispielsweise für eine Lötverbindung herangezogen werden kann. Da die Hohlbohrkronen aufgrund der auftretenden Drehmomente und gegebenenfalls einwirkenden Schlagkräfte erheblichen Beanspruchungen ausgesetzt sind, kann es zu einem Loslösen der Schneidkörper vom Trägerkörper kommen, so dass die Hohlbohrkrone als Ganzes unbrauchbar wird.Due to the difference between the wall thickness of the carrier body and the dimension of the cutting body measured in the radial direction, these known hollow drill bits are only a relatively small connection area is available, which can be used for a soldered connection, for example. Since the hollow core bits are exposed to considerable stresses due to the torques which occur and any impact forces acting on them, the cutting bodies can become detached from the carrier body, so that the hollow core bit as a whole is unusable.

Bei der aus der CH-PS 414 438 bekannten Hohlbohrkrone ist der gesamte bohrrichtungsseitige Endbereich des Trägerkörpers umlaufend mit einer grösseren Wandstärke versehen, wobei diese grössere Wandstärke dem radial gemessenen Mass der Schneidkörper entspricht. Damit entsteht keine Differenz zwischen Wandstärke des Trägerkörpers und dem radial gemessenen Mass der Schneidkörper, so dass das gesamte in radialer Richtung gemessene Mass der Schneidkörper für die Verbindung mit dem Trägerkörper zur Verfügung steht. Der Nachteil des Loslösens der Schneidkörper kann dadurch weitgehend behoben werden, allerdings unter Erkauf eines weiteren ganz wesentlichen Nachteiles, nämlich dem Anstieg der Reibung des Trägerkörpers innerhalb der herzustellenden Bohrung aufgrund des umlaufenden Endbereiches mit grösserer Wandstärke. Darüber hinaus kann aufgrund des in diesem Endbereich fehlenden Ringspaltes das abgebaute Material nicht entweichen. Nebst der durch die Reibung entstehenden Wärme erfolgt zusätzlich eine Verdichtung des abgebauten Materials, so dass die dadurch entstehenden Ueberbeanspruchungen nebst einem Leistungsabfall wiederum zu einem vorzeitigen Ausfall der Hohlbohrkrone als Ganzes führen können.In the case of the hollow drill bit known from CH-PS 414 438, the entire end region of the carrier body on the drilling direction side is provided with a larger wall thickness all round, this larger wall thickness corresponding to the radially measured dimension of the cutting body. There is therefore no difference between the wall thickness of the carrier body and the radially measured dimension of the cutting bodies, so that the entire dimension of the cutting bodies measured in the radial direction is available for connection to the carrier body. The disadvantage of detaching the cutting bodies can thereby largely be remedied, but with the purchase of a further very significant disadvantage, namely the increase in the friction of the carrier body within the bore to be produced due to the circumferential end region with greater wall thickness. In addition, due to the lack of an annular gap in this end region, the mined material cannot escape. In addition to the heat generated by the friction, the mined material is also compressed, so that the resulting stresses, in addition to a drop in performance, can in turn lead to premature failure of the hollow core bit as a whole.

Eine weitere Hohlbohrkrone ist aus der US-3 308 689 bekannt, bei der sich die Aussenkontur des Trägerkörper im bohrrichtungsseitigen Endbereich in radialer Richtung nach aussen hin erweitert, so dass der Trägerkörper an seinem bohrrichtungsseitigen freien Ende eine insgesamt grössere Wandstärke aufweist. Dieser bohrrichtungsseitige freie Endbereich ist versehen mit mehreren, der Aufnahme eines Schneidkörpers dienenden Aussparungen und mehreren Abfuhmuten. Diese Abfuhmuten erstrecken sich in Bohrrichtung über den gesamten erweiterten, bohrrichtungsseitigen Endbereich des Trägerkörpers und münden in jeweils eine der Aussparungen. Die Grundflächen dieser Abfuhrnuten erstrecken sich tangential zur nicht erweiterten Aussenkontur des Trägerkörpers. Da die Erstreckung der Aussparungen in Umfangsrichtung des Trägerkörpers grösser ist als die Erstreckung der Schneidkörper, steht nur ein Teil jeder Aussparung als Verbindungsfläche zur Verfügung.A further hollow drill bit is known from US Pat. No. 3,308,689, in which the outer contour of the carrier body widens radially outward in the end region on the drilling direction side, so that the carrier body has an overall greater wall thickness at its free end on the drilling direction side. This free end area on the drilling direction side is provided with a plurality of cut-outs for receiving a cutting body and a plurality of discharge grooves. These removal grooves extend in the drilling direction over the entire extended, drilling direction end region of the carrier body and each open into one of the cutouts. The base areas of these discharge grooves extend tangentially to the non-expanded outer contour of the carrier body. Since the extent of the cutouts in the circumferential direction of the carrier body is greater than the extent of the cutting bodies, only a part of each cutout is available as a connecting surface.

Der Erfindung liegt die Aufgabe zugrunde, eine Hohlbohrkrone zu schaffen, die einerseits zu einem hohen Wirkungsgrad führt und andererseits eine hohe Lebenserwartung aufweist.The invention has for its object to provide a hollow core bit, which on the one hand leads to high efficiency and on the other hand has a high life expectancy.

Erfindungsgemäss wird die Aufgabe dadurch gelöst, dass der Trägerkörper der Hohlbohrkrone auf den Umgebungsbereich der Aussparungen begrenzte Querschnittsverstärkungen aufweist, die sich in Umfangsrichtung des Trägerkörpers beidseits und entgegen der Bohrrichtung an die Aussparungen anschliessen.According to the invention, the object is achieved in that the carrier body of the hollow drill bit has cross-sectional reinforcements which are limited to the surrounding area of the recesses and which adjoin the recesses in the circumferential direction of the carrier body on both sides and counter to the drilling direction.

Die erfindungsgemäss auf den Umgebungsbereich der Aussparungen begrenzten Querschnittsverstärkungen des Trägerkörpers führen zu einer derartigen Vergrösserung der Verbindungsfläche, dass die Schneidkörper in den Aussparungen selbst unter hohen Beanspruchungen ausreichend gehaltert sind. Es reichen für die Verbindung übliche, bekannte Massnahmen wie Löt-, Schweiss- oder Sinterverbindungen aus. Nebst dieser Vergrösserung der Verbindungsflächen wird durch die partiellen Querschnittsverstärkungen die Reibung zwischen Trägerkörper und herzustellender Bohrung im Bauteil nicht wesentlich erhöht, vor allem in der Weise nicht, dass eine zu hohe Wärmeentwicklung auftritt. Dadurch, dass sich die Querschnittsverstärkungen nicht über den gesamten Umfang des Trägerkörpers erstrecken, steht für die Abfuhr des abgebauten Materials noch ausreichend Raum zur Verfügung. Damit ist auch die Gefahr einer Verdichtung des abgebauten Materials, welche zu einem Leistungsabfall führen kann, behoben.The cross-sectional reinforcements of the carrier body limited according to the invention to the surrounding area of the cutouts lead to such an enlargement of the connecting area that the cutting bodies are sufficiently held in the cutouts even under high loads. Common, known measures such as soldering, welding or sintering connections are sufficient for the connection. In addition to this enlargement of the connecting surfaces, the partial cross-sectional reinforcements do not significantly increase the friction between the carrier body and the bore to be produced in the component, especially not in such a way that excessive heat is generated occurs. Because the cross-sectional reinforcements do not extend over the entire circumference of the carrier body, there is still sufficient space for the removal of the dismantled material. This also eliminates the risk of compression of the mined material, which can lead to a drop in performance.

Die Querschnittsverstärkungen können die Wandstärke des Trägerkörpers beispielsweise nur an der Aussenkontur überragen; dies unter dem Gesichtspunkt, dass die grösste Reibung an der Aussenkontur auftritt und ebenfalls an der Aussenköntur überwiegend abgebautes Material abgeführt werden muss. Demgegenüber besteht aber auch die Möglichkeit, den Trägerkörper derart auszubilden, dass die Querschnittsverstärkungen die Wandstärke nur an der Innenkontur überragen. Dieser Anwendungsfall ist beispielsweise für Hohlbohrkronen geeignet, welche vornehmlich der Herstellung kürzerer Bohrungen dienen. Ein optimaler Kompromiss kann jedoch darin bestehen, sowohl die Innenkontur als auch die Aussenkontur des Trägerkörpers von den Querschnittsverstärkungen überragen zu lassen.The cross-sectional reinforcements can only project beyond the wall thickness of the support body, for example, only on the outer contour; this from the point of view that the greatest friction occurs on the outer contour and material that has largely been removed must also be removed on the outer contour. In contrast, however, there is also the possibility of designing the carrier body in such a way that the cross-sectional reinforcements project beyond the wall thickness only on the inner contour. This application is suitable, for example, for hollow core bits, which are primarily used to produce shorter holes. However, an optimal compromise can be to have both the inner contour and the outer contour of the carrier body protrude from the cross-sectional reinforcements.

Unabhängig davon, ob es sich um ein Ueberragen an der Innenkontur, an der Aussenkontur oder an beiden Konturen handelt, entspricht zweckmässigerweise die Wandstärke des Trägerkörpers im Bereich der Querschnittsverstärkungen dem 1,2- bis 1,8-fachen der restlichen Wandstärke des Trägerkörpers.Regardless of whether it is a protrusion on the inner contour, on the outer contour or on both contours, the wall thickness of the carrier body in the area of the cross-sectional reinforcements expediently corresponds to 1.2 to 1.8 times the remaining wall thickness of the carrier body.

In Umfangsrichtung können die Querschnittsverstärkungen dem jeweiligen Anwendungsfall und den in Betracht kommenden Durchmesserverhältnissen angepasst werden. Dabei entspricht vorteilhafterweise das in Umfangsrichtung des Trägerkörpers gemessene Mass der Querschnittsverstärkungen beidseits der Aussparungen je dem 0,3- bis 1-fachen der in Umfangsrichtung des Trägerkörpers gemessenen Breite der Aussparungen. Die Verteilung in Umfangsrichtung der Querschnittsverstärkungen erfolgt zweckmässigerweise symmetrisch, bezogen auf die Aussparungen.In the circumferential direction, the cross-sectional reinforcements can be adapted to the respective application and the diameter ratio under consideration. The dimension of the cross-sectional reinforcements on both sides of the recesses, measured in the circumferential direction of the carrier body, advantageously corresponds to 0.3 to 1 times the width of the recesses measured in the circumferential direction of the carrier body. The distribution in the circumferential direction of the cross-sectional reinforcements is expediently symmetrical, based on the cutouts.

Auch das in axialer Richtung gemessene Mass der Querschnittsverstärkungen ist vorteilhafterweise auf die jeweiligen Anwendungsfälle abgestimmt. Dabei erstrecken sich die Querschnittsverstärkungen zweckmässigerweise anschliessend an den Grund der Ausnehmungen entgegen der Bohrrichtung um ein Mass, das dem 0,5- bis 1,4-fachen der in Umfangsrichtung des Trägerkörpers gemessenen Breite der Aussparungen entsprichtThe dimension of the cross-sectional reinforcements measured in the axial direction is also advantageously matched to the respective applications. The cross-sectional reinforcements expediently then extend at the base of the recesses counter to the drilling direction by an amount which corresponds to 0.5 to 1.4 times the width of the recesses measured in the circumferential direction of the carrier body

Die Erfindung wird nachstehend anhand von Zeichnungen, welche ein Ausführungsbeispiel wiedergeben, näher erläutert. Es zeigen:

Fig. 1
einen Längsschnitt durch eine Hohlbohrkrone gemäss Erfindung;
Fig. 2
eine vergrösserte Ansicht des Details A der Fig. 1;
Fig. 3
einen Schnitt längs der Linie III-III der Fig. 2.
The invention is explained in more detail below with the aid of drawings which represent an exemplary embodiment. Show it:
Fig. 1
a longitudinal section through a hollow core bit according to the invention;
Fig. 2
an enlarged view of detail A of Fig. 1;
Fig. 3
a section along the line III-III of Fig. 2nd

Die Fig. 1 zeigt eine erfindungsgemässe Hohlbohrkrone mit Trägerkörper 1 und Schneidkörpern 2. Entgegen der Bohrrichtung ist der Trägerkörper 1 mit einem Boden 1a versehen, welcher von einer Gewindebohrung 1b durchsetzt ist, so dass ein Adapter darin aufgenommen werden kann.1 shows a hollow core bit according to the invention with carrier body 1 and cutting bodies 2. Contrary to the direction of drilling, the carrier body 1 is provided with a bottom 1a, which is penetrated by a threaded bore 1b, so that an adapter can be accommodated therein.

Wie die Fig. 1 und auch die Fig. 2 und 3 zeigen, sind die Schneidkörper 2 in Aussparungen 1c des Trägerkörpers 1 angeordnet. Der Trägerkörper 1 weist im Umgebungsbereich dieser Aussparungen 1 c Querschnittsverstärkungen 1d auf.As FIG. 1 and also FIGS. 2 and 3 show, the cutting bodies 2 are arranged in recesses 1c of the carrier body 1. The carrier body 1 has cross-sectional reinforcements 1d in the vicinity of these cutouts 1c.

Wie die Fig. 1 und insbesondere die Fig. 3 zeigt, überragen die Querschnittsverstärkungen 1d die Wandstärke T des Trägerkörpers 1 beispielhaft sowohl an der Innen- als auch an der Aussenkontur. Die Wandstärke Q im Bereich der Querschnittsverstärkungen 1d ist damit grösser als die restliche Wandstärke T des Trägerkörpers 1, wobei die Wandstärke Q im Bereich der Querschnittsverstärkungen 1d im wesentlichen kleiner bis annähernd gleich dem radial gemessenen Mass der Schneidkörper 2 entspricht.As FIG. 1 and in particular FIG. 3 shows, the cross-sectional reinforcements 1d project beyond the wall thickness T of the carrier body 1 by way of example both on the inner and on the outer contour. The wall thickness Q in the area of the cross-sectional reinforcements 1d is thus greater than the remaining wall thickness T of the carrier body 1, the wall thickness Q in the area of the cross-sectional reinforcements 1d corresponding substantially less to approximately the same as the radially measured dimension of the cutting bodies 2.

Wiederum aus Fig. 1 und insbesondere aus Fig. 2 ist femer ersichtlich, wie sich die Querschnittsverstärkungen 1d in Umfangsrichtung des Trägerkörpers 1 beidseits an die Aussparungen 1c anschliessen und zwar jeweils um das in Umfangsrichtung des Trägerkörpers 1 gemessene Mass U. Dieses Mass U entspricht einem Anteil der in Umfangsrichtung gemessenen Breite B der Aussparungen 1c. Darüber hinaus erstrecken sich die Querschnittsverstärkungen 1d entgegen der Bohrrichtung über den Grund der Ausnehmungen 1c hinaus und zwar um das Mass G, wie wiederum Fig. 1 und insbesondere Fig. 2 zeigt.Again, from FIG. 1 and in particular from FIG. 2, it can also be seen how the cross-sectional reinforcements 1d in the circumferential direction of the carrier body 1 adjoin the cutouts 1c on both sides, namely by the dimension U measured in the circumferential direction of the carrier body 1. This dimension U corresponds to a Proportion of the width B of the cutouts 1c measured in the circumferential direction. In addition, the cross-sectional reinforcements 1d extend counter to the direction of drilling beyond the base of the recesses 1c, namely by the dimension G, as again shown in FIG. 1 and in particular in FIG. 2.

Herstellen lässt sich der Trägerkörper 1 in verschiedenartiger Weise. In bevorzugter Weise kommt jedoch eine spanlose Umformung zur Anwendung. Ebenso bestehen verschiedene Möglichkeiten der Verbindung zwischen Trägerkörper 1 und Schneidkörpem 2. In bevorzugter Weise findet jedoch eine Lötverbindung Anwendung.The carrier body 1 can be produced in various ways. However, non-cutting shaping is preferably used. There are also various possibilities for the connection between the carrier body 1 and the cutting body 2. However, a soldered connection is preferably used.

Claims (6)

  1. Auger crown with a hollow cylindrical carrier body (1) the end area of which on the drilling side comprises open cutouts (1c) in the drilling direction serving to accommodate cutting elements (2) which axially project over the carrier body (1) both at its inside and outside contour, characterised in that the carrier body (1) comprises cross-sectional reinforcements (1d) which are restricted to the peripheral area of the cutouts (1c) and which are adjacent the cutouts (1c) in the peripheral direction of the carrier body (1) on both sides as well as against the drilling direction.
  2. Auger crown according to Claim 1, characterised in that the cross-sectional reinforcements (1d) project over the wall thickness (T) of the carrier body (1) on the outside contour.
  3. Auger crown according to Claim 1 or 2, characterised in that the cross-sectional reinforcements (1d) project on the inside contour over the wall thickness (T) of the carrier body (1).
  4. Auger crown according to one of Claims 1 to 3, characterised in that the wall thickness (Q) of the carrier body (1) corresponds in the area of the cross-sectional reinforcements (1d) with between 1.2 and 1.8 times the remaining wall thickness (T) of the carrier body (1).
  5. Auger crown according to one of Claims 1 to 4, characterised in that the dimension (U) of the cross-sectional reinforcements as measured in the peripheral direction of the carrier body (1) corresponds on both sides of the cutouts (1c) respectively between 0.3 and 1 times the width (B) of the cutouts (1c) as measured in the peripheral direction of the carrier body (1).
  6. Auger crown according to one of Claims 1 to 5, characterised in that the cross-sectional reinforcements (1d) extend adjoining the base of the cutouts (1c) against the drilling direction by a dimension (G) which corresponds with between 0.5 and 1.4 times the width (B) of the cutouts (1c) as measured in the peripheral direction of the support element.
EP95810465A 1994-10-15 1995-07-14 Tubular saw Expired - Lifetime EP0706870B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4436915 1994-10-15
DE4436915A DE4436915A1 (en) 1994-10-15 1994-10-15 Hollow core bit with a hollow cylindrical carrier body

Publications (2)

Publication Number Publication Date
EP0706870A1 EP0706870A1 (en) 1996-04-17
EP0706870B1 true EP0706870B1 (en) 2001-09-19

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ID=6530874

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Application Number Title Priority Date Filing Date
EP95810465A Expired - Lifetime EP0706870B1 (en) 1994-10-15 1995-07-14 Tubular saw

Country Status (11)

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US (1) US5569002A (en)
EP (1) EP0706870B1 (en)
JP (1) JPH08197533A (en)
KR (1) KR100351536B1 (en)
CN (1) CN1081116C (en)
AT (1) ATE205769T1 (en)
CA (1) CA2160044C (en)
DE (2) DE4436915A1 (en)
DK (1) DK0706870T3 (en)
FI (1) FI105537B (en)
HU (1) HU216525B (en)

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DE19826919A1 (en) * 1998-06-17 1999-12-23 Hilti Ag Tool for processing hard surfaces
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US6637101B2 (en) 2001-06-22 2003-10-28 Radio Frequency Systems, Inc. Coaxial cable preparation tool
US6786684B1 (en) 2001-08-15 2004-09-07 Robert J. Ecker Tubular hole cutter
TWI263552B (en) * 2003-06-05 2006-10-11 Miyanaga Kk Core cutter
CA2559991A1 (en) * 2005-12-20 2007-06-20 Andy Locke A rotary cutting tool for intermittent cutting through metal
JP5318338B2 (en) * 2006-08-10 2013-10-16 マックス株式会社 Non-core drill bit
DE102007018791B3 (en) * 2007-04-20 2008-08-14 Atlas Diamant Werkzeuge Gmbh Making strip connecting cutting segments, used to manufacture core-drilling bit, lays metal strip in sintering mold, adds green molded cutters and completes sintering and bonding in single firing
US20080296069A1 (en) * 2007-05-30 2008-12-04 Nikola Ljubic Novel core drill bit housing and core drill bit
US20140017021A1 (en) * 2012-07-12 2014-01-16 General Electric Company Apparatus for removing retainer material
CN108812748B (en) * 2015-09-02 2021-07-06 九阳股份有限公司 Noodle maker convenient for making chewy noodles

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AT242579B (en) 1962-11-03 1965-09-27 Artur Fischer Process for the production of a hard metal drill, in particular for drilling in hard material such as concrete or stone
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Also Published As

Publication number Publication date
CA2160044A1 (en) 1996-04-16
FI954849A (en) 1996-04-16
US5569002A (en) 1996-10-29
JPH08197533A (en) 1996-08-06
ATE205769T1 (en) 2001-10-15
DE4436915A1 (en) 1996-04-18
HUT72770A (en) 1996-05-28
DK0706870T3 (en) 2001-11-26
HU216525B (en) 1999-07-28
HU9502974D0 (en) 1995-12-28
FI105537B (en) 2000-09-15
FI954849A0 (en) 1995-10-12
CN1081116C (en) 2002-03-20
CN1129635A (en) 1996-08-28
KR960013598A (en) 1996-05-22
EP0706870A1 (en) 1996-04-17
KR100351536B1 (en) 2002-12-28
CA2160044C (en) 1998-12-15
DE59509611D1 (en) 2001-10-25

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