EP0569985B1 - Rotating tool with hardmetal inserts - Google Patents
Rotating tool with hardmetal inserts Download PDFInfo
- Publication number
- EP0569985B1 EP0569985B1 EP93107808A EP93107808A EP0569985B1 EP 0569985 B1 EP0569985 B1 EP 0569985B1 EP 93107808 A EP93107808 A EP 93107808A EP 93107808 A EP93107808 A EP 93107808A EP 0569985 B1 EP0569985 B1 EP 0569985B1
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- EP
- European Patent Office
- Prior art keywords
- rotary tool
- tool according
- pins
- rotation
- axis
- 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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- 238000005553 drilling Methods 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims description 21
- 229910052582 BN Inorganic materials 0.000 claims description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 description 5
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000009528 severe injury Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- 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
- E21B10/56—Button-type inserts
-
- 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
- E21B10/48—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of core type
- E21B10/485—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of core type with inserts in form of chisels, blades or the like
-
- 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
- E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
Definitions
- the invention relates to a rotary tool, in particular a drilling tool, with a front end face in the feed direction and with hard metal inserts protruding in the feed direction over the front end face, which are releasably embedded in a part of the rotary tool body which forms the front end face.
- Such rotary tools are known, for example, as drill bits from US Pat. No. 4,782,902. They contain hard metal inserts which serve as cutting elements. These carbide inserts are firmly connected to the rotary tool body in the manufacture of these rotary tools by means of lock nuts which engage in threads on the hard metal inserts within the front rotary tool body.
- the object of the invention is to provide a rotary tool of the type mentioned in the introduction, in which the replacement of worn carbide inserts can be carried out simply, easily, inexpensively and by any operator.
- the carbide inserts are designed as pins with one working tip. If the pins are given a conical shape tapering from the working tip, they can be inserted into openings with a corresponding, conical shape in the front end face of the rotary tool, whereby a firm but nevertheless detachable connection with the rotary tool body can be obtained. If the conical openings are made continuously from the front end surface, which represents the work area, to the rear end surface, the recessed and fixed pins can be driven out from the rear end surface in the direction of the front end surface without great effort and can be removed from the opening on the front end surface. For example, the pins can be driven out with a mandrel and a hammer without the need for special tools.
- the pins are arranged on circles concentric to the axis of rotation in planes perpendicular to the axis of rotation, pins arranged symmetrically to the axis of rotation each lying on a concentric circle.
- several clearing circles are created which enlarge the clearing area and whose radial distance from one another is less than the maximum diameter of the pins, as a result of which a larger number of pins can act in the clearing surface. This can also be achieved by spiraling the pins.
- a central and continuous opening in the rotary tool body which is symmetrical about the axis of rotation provides a connection possibility to a drive linkage and furthermore enables, for example, the insertion of a center drill to support a rotary tool used as a drill bit.
- Dividing the rotary tool body in two along a cutting plane perpendicular to the axis of rotation into a first half with a front end face and a second half with a rear end face and with connecting faces on which the two halves can lie against one another in the assembled state and can be screwed together further facilitates the replacement of the hard metal inserts, since it is sufficient instead of detaching the entire rotary tool body from a drive linkage, removing the first half of the rotary tool body and replacing the hard metal inserts located therein.
- a rotary tool with a convex end face is typically used as a drill bit.
- a rotary tool which can be used as a ring drill.
- a circle of pins is arranged symmetrically about the axis of rotation on the front face.
- the openings for receiving the pins are only continuous in the first half of the rotary tool body, the ends of the openings facing away from the front end face are protected from the ingress of foreign bodies by the attached second half, which means that unhindered access to the halves immediately after the halves have been released the carbide inserts carrying openings is possible, which significantly facilitates the replacement process.
- radial elevations are arranged on one of the connecting surfaces, which protrude into corresponding recesses in the other Grab the connecting surface.
- a circularly symmetrical elevation around the central opening on one of the connecting surfaces engages in a corresponding recess in the other connecting surface, as a result of which exact centering with the axis of rotation is achieved when the two halves are put together.
- Rotation tools e.g. B. are used as drill bits, pins made of boron nitride and the openings for the insertion of the pins are arranged parallel to the axis of rotation.
- Figure 1 shows a partially sectioned and perspective view of a first embodiment of a rotary tool.
- a first half 31 of a rotary tool body 15 contains openings 13 for receiving hard metal inserts 12, which are inserted in such a way that they protrude from a front end face 11. These openings 13 extend continuously from the front end surface 11 to a connecting surface 34 of the first half 31 with a second half 32. Starting from the front end surface 11 in the direction of the connecting surface 34, the openings 13 have a conically tapering shape.
- the carbide inserts 12 have a corresponding conical tapering shape, so that a non-positive connection is made possible. This is shown enlarged and in a sectional view in FIG. 2.
- the hard metal insert 12 slides into the opening 13 until a frictional force fit of the hard metal insert 12 is achieved due to the conical shape. If the hard metal insert 12 is seated firmly in the opening 13, a working tip 14 projects beyond the front end face 11.
- a pin-like object with a correspondingly small diameter can reach into the openings 13 from the connecting surface 34 and the hard metal inserts 12 can be knocked out in the feed direction, for example by means of a hammer.
- the second half 32 of the rotary tool body 15 is designed such that it attaches to the first half 31 in a form-fitting manner.
- a circularly symmetrical elevation 50 which is arranged on one of the two halves 31 or 32, is used by a central opening 20 present in the rotary tool body 15, which elevation 50 in a corresponding recess 51 on the other of the two halves 32 or 31 engages.
- radial elevations 40 are arranged in the second half, which in turn engage in corresponding recesses 41 in the first half 31.
- this arrangement can also be implemented in reverse.
- Screws 21, which engage through openings 22 in the second half 32 in threaded bores 23 in the first half, are used to fasten the two halves 31 and 32 together.
- Figure 3 shows a perspective view of a second embodiment of a rotary tool according to the invention.
- the central opening 120 is expanded so far that the front end face 111 consists only of a narrow ring.
- the openings 113 with the hard metal inserts 112 are arranged in a circle symmetrically about the axis of rotation 116. Thus, cylindrical segments can be drilled out without the need for expensive hard metal inserts 112 over the entire cross section of the drilling opening.
- four radial elevations 140 in the second half 132 which engage in corresponding recesses 141 in the first half 131, transmit the torque from the second half 132 to the first half 131 of the rotary tool body 115.
- a circularly symmetrical elevation as in FIG. 1 (reference number 50) with a corresponding recess (reference number 51 in FIG. 1) can also be applied to this exemplary embodiment for precise centering when the two halves 131 and 132 are assembled with respect to the axis of rotation 116.
- screws can be used which engage through openings in one of the two halves 131 and 132 in corresponding threaded bores in the corresponding other half.
- the rotary tool as described above by way of example in possible embodiments, is distinguished by a very simple handling in relation to the replacement of worn carbide inserts. Neither expensive special tools nor specially trained personnel are required for this.
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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)
- Earth Drilling (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
Description
Die Erfindung betrifft ein Rotationswerkzeug, insbesondere ein Bohrwerkzeug, mit einer in Vorschubrichtung vorderen Stirnfläche und mit in Vorschubrichtung über die vordere Stirnfläche vortretenden Hartmetalleinsätzen, die lösbar in einen Teil des Rotationswerkzeugkörpers, der die vordere Stirnfläche bildet, eingelassen sind.The invention relates to a rotary tool, in particular a drilling tool, with a front end face in the feed direction and with hard metal inserts protruding in the feed direction over the front end face, which are releasably embedded in a part of the rotary tool body which forms the front end face.
Solche Rotationswerkzeuge sind beispielsweise bekannt als Bohrkronen aus dem US-PS 4 782 902. Sie enthalten Hartmetalleinsätze, die als Schneidelemente dienen. Diese Hartmetalleinsätze werden bei der Herstellung dieser Rotationswerkzeuge mittels Kontermuttern, die in Gewinde an den Hartmetalleinsätzen innerhalb des vorderen Rotationswerkzeugkörpers eingreifen, fest mit dem Rotationswerkzeugkörper verbunden.Such rotary tools are known, for example, as drill bits from US Pat. No. 4,782,902. They contain hard metal inserts which serve as cutting elements. These carbide inserts are firmly connected to the rotary tool body in the manufacture of these rotary tools by means of lock nuts which engage in threads on the hard metal inserts within the front rotary tool body.
Das Verfahren zur Befestigung der Hartmetalleinsätze an den Rotationswerkzeugkörpern mittels einer Schraubverbindung ist sehr aufwendig, kostenintensiv, benötigt spezielles Werkzeug und kann nur von speziell geschulten Fachleuten durchgeführt werden. Für den Anwender eines solchen Rotationswerkzeuges führt dies zu einem umständlichen und teuren Recyclingverfahren, bei dem ein abgenutztes Rotationswerkzeug erst wieder zum Hersteller gebracht werden muß, wo die abgenutzten Stifte entfernt und neue Stifte mit dem aufwendigen Schraubverfahren angebracht werden, bevor es erneut einsatzbereit ist. Meist ist es daher billiger ein abgenutztes Rotationswerkzeug durch ein neues zu ersetzen und das abgenutzte wegzuwerfen.The method for fastening the hard metal inserts to the rotary tool bodies by means of a screw connection is very complex, cost-intensive, requires special tools and can only be carried out by specially trained specialists. For the user of such a rotary tool, this leads to a cumbersome and expensive recycling process, in which a worn rotary tool first has to be brought back to the manufacturer, where the worn pins are removed and new pins are attached using the complex screwing process before it is ready for use again. It is therefore usually cheaper to replace a worn rotary tool with a new one and to throw away the worn one.
Aufgabe der Erfindung ist es, ein Rotationswerkzeug der eingangs genannten Art zur Verfügung zu stellen, bei dem die Erneuerung abgenutzter Hartmetalleinsätze einfach, problemlos, kostengünstig und von jedem Bediener durchgeführt werden kann.The object of the invention is to provide a rotary tool of the type mentioned in the introduction, in which the replacement of worn carbide inserts can be carried out simply, easily, inexpensively and by any operator.
Diese Aufgabe wird bei einem Rotationswerkzeug der eingangs genannten Art erfindungsgemäß dadurch gelöst, daß die Hartmetalleinsätze Stifte sind mit einer Arbeitsspitze und eine konische Form aufweisen, die sich von der Arbeitsspitze ausgehend verjüngt, und daß die Öffnungen in der vorderen Stirnfläche zur Aufnahme der Stifte entsprechend ausgebildet sind, und daß dadurch ein fester, aber trotzdem jederzeit lösbarer Klemmsitz mit dem Rotationswerkzeugkörper erhaltbar ist.This object is achieved according to the invention in a rotary tool of the type mentioned at the outset in that the hard metal inserts have pins with a working tip and a conical shape which tapers starting from the working tip, and in that the openings in the front end face are designed to accommodate the pins are, and that thereby a firm, but still releasable clamp fit can be obtained with the rotary tool body.
Durch die Repararturmöglichkeit der Rotationswerkzeuge vor Ort wird ein kostengünstiger und problemloser Betrieb von Rotationswerkzeugen benutzenden Maschinen erreicht. Beispielsweise erforderte die starke Beschädigung eines einzigen Hartmetalleinsatzes bisher das Auswechseln des gesamten Rotationswerkzeugkörpers. Bei einem Rotationswerkzeug der vorliegenden Erfindung braucht lediglich der beschädigte Hartmetalleinsatz ausgewechselt zu werden. Dabei ist dies ohne besondere Vorkenntnisse von jedem Bediener solcher Maschinen ausführbar.Due to the possibility of repairing the rotary tools on site, inexpensive and problem-free operation of machines using rotary tools is achieved. For example, the severe damage to a single hard metal insert previously required the replacement of the entire rotary tool body. In a rotary tool of the present invention, only the damaged hard metal insert needs to be replaced. This can be done by any operator of such machines without special previous knowledge.
Gleichzeitig wird ein umweltfreundlicher Recyclingprozeß ohne umweltbelastende Abfallprodukte erreicht und der Industrieabfall von weggeworfenen Rotatonswerkzeugkörpern entlastet.At the same time, an environmentally friendly recycling process without environmentally harmful waste products is achieved and the industrial waste is relieved of discarded Rotatons tool bodies.
Zur Senkung der Produktionskosten werden die Hartmetalleinsätze als Stifte mit einer Arbeitsspitze ausgeführt. Gibt man den Stiften eine von der Arbeitspitze ausgehend verjüngende konische Form, so sind sie in Öffnungen mit entsprechender, konischer Form in der vorderen Stirnfläche des Rotationswerkzeugs einführbar, wodurch eine feste aber trotzdem jederzeit lösbare Verbindung mit dem Rotationswerkzeugkörper erhaltbar ist. Sind die konischen Öffnungen durchgehend von der vorderen Stirnflache, die den Arbeitsbereich darstellt, bis zur hinteren Stirnfläche ausgeführt, so sind die eingelassenen und festsitzenden Stifte von der hinteren Stirnfläche in Richtung vorderer Stirnfläche ohne großen Aufwand austreibbar und an der vorderen Stirnfläche aus der Öffnung entnehmbar. Beispielsweise sind die Stifte mit einem Dorn und einem Hammer austreibbar, ohne dabei Spezialwerkzeug zu benötigen.To reduce production costs, the carbide inserts are designed as pins with one working tip. If the pins are given a conical shape tapering from the working tip, they can be inserted into openings with a corresponding, conical shape in the front end face of the rotary tool, whereby a firm but nevertheless detachable connection with the rotary tool body can be obtained. If the conical openings are made continuously from the front end surface, which represents the work area, to the rear end surface, the recessed and fixed pins can be driven out from the rear end surface in the direction of the front end surface without great effort and can be removed from the opening on the front end surface. For example, the pins can be driven out with a mandrel and a hammer without the need for special tools.
Die Stifte sind auf, zur Rotationsachse konzentrischen, Kreisen in Ebenen senkrecht zur Rotationsachse angeordnet, wobei jeweils zur Rotationsachse symmetrisch angeordnete Stifte auf einem konzentrischen Kreis liegen. Dadurch werden mehrere Abräumkreise geschaffen, die den Abräumbereich vergrößern und deren radialer Abstand voneinander geringer ist als der maximale Durchmesser der Stifte, wodurch eine größere Anzahl Stifte in der Abräumfläche wirken können. Dies kann auch durch eine spiralige Anordnung der Stifte erreicht werden.The pins are arranged on circles concentric to the axis of rotation in planes perpendicular to the axis of rotation, pins arranged symmetrically to the axis of rotation each lying on a concentric circle. As a result, several clearing circles are created which enlarge the clearing area and whose radial distance from one another is less than the maximum diameter of the pins, as a result of which a larger number of pins can act in the clearing surface. This can also be achieved by spiraling the pins.
Eine um die Rotationsachse symmetrische, mittige und durchgehende Öffnung im Rotationswerkzeugkörper ergibt eine Anschlußmöglichkeit an ein Antriebsgestänge und ermöglicht weiterhin z.B. das Einführen eines Zentrierbohrers zur Unterstützung eines als Bohrkrone verwendeten Rotationswerkzeuges.A central and continuous opening in the rotary tool body which is symmetrical about the axis of rotation provides a connection possibility to a drive linkage and furthermore enables, for example, the insertion of a center drill to support a rotary tool used as a drill bit.
Eine Zweiteilung des Rotationswerkzeugkörpers entlang einer Schnittebene senkrecht zur Rotationsachse in eine erste Hälfte mit vorderer Stirnfläche und eine zweite Hälfte mit einer hinterer Stirnfläche und mit Verbindungsflächen an denen die beiden Hälften im zusammengesetzten Zustand aneinanderliegen und miteinander verschraubt werden können, erleichtert das Auswechseln der Hartmetalleinsätze weiter, da es ausreicht statt den ganzen Rotationswerkzeugkörper von einem Antriebsgestänge zu lösen, die erste Hälfte des Rotationswerkzeugkörpers abzunehmen und die darin befindlichen Hartmetalleinsätze auszutauschen.Dividing the rotary tool body in two along a cutting plane perpendicular to the axis of rotation into a first half with a front end face and a second half with a rear end face and with connecting faces on which the two halves can lie against one another in the assembled state and can be screwed together further facilitates the replacement of the hard metal inserts, since it is sufficient instead of detaching the entire rotary tool body from a drive linkage, removing the first half of the rotary tool body and replacing the hard metal inserts located therein.
Ein Rotationswerkzeug mit konvexer Stirnfläche wird typischerweise als Bohrkrone verwendet.A rotary tool with a convex end face is typically used as a drill bit.
Bei Ausdehnung der mittigen Öffnung, so daß nur noch ein schmaler Ring als vordere Stirnfläche vorhanden ist, erhält man ein Rotationswerkzeug, das als Kranzbohrer eingesetzt werden kann. Bei dieser Ausführungsform, wird üblicherweise nur ein Kreis von Stiften symmetrisch um die Rotationsachse auf der vorderen Stirnfläche angeordnet.When the central opening is expanded so that only a narrow ring is left as the front end face, a rotary tool is obtained which can be used as a ring drill. In this embodiment, usually only a circle of pins is arranged symmetrically about the axis of rotation on the front face.
Sind die Öffnungen zur Aufnahme der Stifte lediglich in der ersten Hälfte des Rotationswerkzeugkörpers durchgehend ausgeführt, so werden die der vorderen Stirnfläche abgewandten Enden der Öffnungen durch die aufgesetzte zweite Hälfte vor dem Eindringen von Fremdkörpern geschützt, wodurch nach dem lösen der Hälften sofort ungehinderter Zugriff auf die die Hartmetalleinsätze tragenden Öffnungen möglich ist, was den Auswechselvorgang wesentlich erleichtert.If the openings for receiving the pins are only continuous in the first half of the rotary tool body, the ends of the openings facing away from the front end face are protected from the ingress of foreign bodies by the attached second half, which means that unhindered access to the halves immediately after the halves have been released the carbide inserts carrying openings is possible, which significantly facilitates the replacement process.
Zur Übertragung des Drehmoments von der zweiten auf die erste Hälfte sind an einer der Verbindungsflächen radiale Erhebungen angeordnet, die in entsprechende Aussparungen in der anderen Verbindungsfläche greifen. Eine kreissymmetrische Erhöhung um die mittige Öffnung an einer der Verbindungsflächen greift in eine entsprechende Aussparung in der anderen Verbindungsfläche, wodurch eine exakte Zentrierung zur Rotationsachse beim Zusammensetzen der beiden Hälften erreicht wird.To transmit the torque from the second to the first half, radial elevations are arranged on one of the connecting surfaces, which protrude into corresponding recesses in the other Grab the connecting surface. A circularly symmetrical elevation around the central opening on one of the connecting surfaces engages in a corresponding recess in the other connecting surface, as a result of which exact centering with the axis of rotation is achieved when the two halves are put together.
Rotationswerkzeuge, die z. B. als Bohrkronen verwendet werden, erhalten Stifte aus Bornitrit und die Öffnungen zum Einlassen der Stifte sind parallel zur Rotationsachse angeordnet.Rotation tools, e.g. B. are used as drill bits, pins made of boron nitride and the openings for the insertion of the pins are arranged parallel to the axis of rotation.
Im folgenden werden bevorzugte Ausführungsformen der Erfindung anhand der beigefügten Zeichnungen näher erläutert.Preferred embodiments of the invention are explained in more detail below with reference to the accompanying drawings.
Darin zeigen:
- Figur 1:
- eine erste Ausführungsform eines erfindungsgemäßen Rotationswerkzeuges in teilweise geschnittener und perspektivischer Ansicht mit auseinandergezogenen Hälften;
- Figur 2:
- eine Schnittansicht eines Hartmetalleinsatzes und der zugehörigen Öffnung;
- Figur 3:
- eine zweite Ausführungsform eines erfindungsgemäßen Rotationswerkzeuges in teilweise geschnittener und perspektivischer Ansicht mit auseiandergezogenen Hälften.
- Figure 1:
- a first embodiment of a rotary tool according to the invention in a partially cut and perspective view with the halves pulled apart;
- Figure 2:
- a sectional view of a hard metal insert and the associated opening;
- Figure 3:
- a second embodiment of a rotary tool according to the invention in a partially cut and perspective view with the halves pulled apart.
Im folgenden werden für übereinstimmende Elemente die gleichen Bezugszeichen verwendet.The same reference numerals are used below for matching elements.
Figur 1 zeigt in teilweise geschnittener und perspektivischer Darstellung eine erste Ausführungsform eines Rotationswerkzeuges. Eine erste Hälfte 31 eines Rotationswerkzeugkörpers 15 enthält Öffnungen 13 zur Aufnahme von Hartmetalleinsätzen 12, die derart eingeführt sind, daß sie aus einer vorderen Stirnfläche 11 herausragen. Diese Öffnungen 13 erstrecken sich von der vorderen Stirnfläche 11 durchgehend bis zu einer Verbindungsfläche 34 der ersten Hälfte 31 mit einer zweiten Hälfte 32. Die Öffnungen 13 haben ausgehend von der vorderen Stirnfläche 11 in Richtung der Verbindungsfläche 34 eine sich konisch verjüngende Form. Eine entsprechende konisch verjüngende Form weisen die Hartmetalleinsätze 12 auf, so daß eine kraftschlüssige Verbindung ermöglicht wird. Dies zeigt vergrößert und in Schnittansicht die Figur 2. Beim Einführen der Hartmetalleinsätze 12 in die Öffnungen 13 gleitet der Hartmetalleinsatz 12 soweit in die Öffnung 13, bis durch die konische Formgebung ein Kraftschluß durch Reibungskraft ein fester Sitz des Hartmetalleinsatzes 12 erzielt ist. Sitzt der Hartmetalleinsatz 12 fest in der Öffnung 13, so ragt eine Arbeitspitze 14 über die vordere Stirnfläche 11 hinaus.Figure 1 shows a partially sectioned and perspective view of a first embodiment of a rotary tool. A
Bei abgelöster zweiter Hälfte 32, wie dies in der Figur 1 dargestellt ist, kann ein stiftartiger Gegenstand mit entprechend kleinem Durchmesser von der Verbindungsfläche 34 aus in die Öffnungen 13 greifen und es können beispielsweise mittels eines Hammers die Hartmetalleinsätze 12 in Vorschubrichtung herausgeschlagen werden.When the
Die zweite Hälfte 32 des Rotationswerkzeugkörpers 15 ist derart ausgebildet, daß sie sich formschlüssig an die erste Hälfte 31 angefügt. Zur genauen Zentrierung beim Zusammensetzen bezüglich einer Rotationsachse 16 dient eine an einer der beiden Hälften 31 oder 32 angeordnete, kreissymmetrische Erhöhung 50 um eine im Rotationswerkzeugkörper 15 vorhandene mittige Öffnung 20, welche Erhöhung 50 in eine entsprechende Aussparung 51 an der anderen der beiden Hälften 32 oder 31 greift.The
Zur Drehmomentübertragung sind in der zweiten Hälfte 32 radiale Erhebungen 40 angeordnet, die wiederum in entsprechende Aussparungen 41 in der ersten Hälfte 31 eingreifen. Selbstverständlich kann diese Anordnung auch umgekehrt verwirklicht sein.For the transmission of
Zur Befestigung der beiden Hälften 31 und 32 miteinander dienen Schrauben 21, die durch Öffnungen 22 in der zweiten Hälfte 32 in Gewindebohrungen 23 in der ersten Hälfte greifen.
Da die Öffnungen 13 zur Aufnahme der Hartmetalleinsätze 12 lediglich in der ersten Hälfte 31 durchgehend ausgeführt sind, werden sie von der aufgesetzten zweiten Hälfte 32 verdeckt und somit vor dem Eindringen von Fremdkörpern geschützt.Since the
Figur 3 zeigt in perspektivischer Darstellung eine zweite Ausführungsform eines erfindungsgemäßen Rotationswerkzeuges. Hier ist die mittige Öffnung 120 so weit ausgedehnt, daß die vordere Stirnfläche 111 lediglich aus einem schmalen Kranz besteht.Figure 3 shows a perspective view of a second embodiment of a rotary tool according to the invention. Here, the
Die Öffnungen 113 mit den Hartmetalleinsätzen 112 sind in einem Kreis symmetrisch um die Rotationsachse 116 angeordnet. Somit können zylinderförmige Segmente ausgebohrt werden, ohne daß auf dem ganzen Querschnitt der Bohröffnung teure Hartmetalleinsätze 112 notwendig sind.The
Hier übertragen vier radiale Erhebungen 140 in der zweiten Hälfte 132, die in entsprechende Aussparungen 141 in der ersten Hälfte 131 greifen, das Drehmoment von der zweiten Hälfte 132 auf die erste Hälfte 131 des Rotationswerkzeugkörpers 115.Here, four
Eine kreissymmetrische Erhöhung wie in Fig. 1 (Bezugszeichen 50) mit entsprechender Aussparung (Bezugszeichen 51 in Fig. 1) kann auch an diesem Ausführungsbeispiel zur genauen Zentrierung beim Zusammensetzen der beiden Hälften 131 und 132 bezüglich der Rotationsachse 116 angebracht werden. Zur Befestigung der beiden Hälften 131 und 132 können beispielsweise Schrauben, die durch Öffnungen in einer der beiden Hälften 131 und 132 in entsprechende Gewindebohrungen in der entsprechend anderen Hälfte greifen, verwendet werden.A circularly symmetrical elevation as in FIG. 1 (reference number 50) with a corresponding recess (
Das Rotationswerkzeug, wie es oben beispielhaft in möglichen Ausführungsformen beschrieben ist, zeichnet sich aus durch eine sehr einfache Handhabung in Bezug auf die Erneuerung von abgenutzten Hartmetalleinsätzen. Hierfür wird weder teueres Spezialwerkzeug, noch speziell geschultes Personal benötigt.The rotary tool, as described above by way of example in possible embodiments, is distinguished by a very simple handling in relation to the replacement of worn carbide inserts. Neither expensive special tools nor specially trained personnel are required for this.
Claims (16)
- A rotary tool, in particular a drilling tool with a front face (11;111) facing ahead in the direction of feed and with hard-metal inserts (12;112) which protrude from the front face (11,111) facing ahead, in the direction of feed, and are releasably inset into a part of the rotary tool body (15;115) forming the front face (11;111) facing ahead
characterised in that the hard-metal inserts are threadless pins (12;112) with a striking tip (14;114) and have a continuous conical shape which tapers from the striking tip (14;114) and that the apertures (13;113) in the front face (11;111) facing ahead are appropriately designed to hold the pins (12;112) thus providing a firm tight grip on the rotary tool body that can nevertheless be released at any time, the conical pin surface being smooth and mounting on the rotary tool body being achieved by pressure connection. - A rotary tool according to claim 1
characterised in that the apertures (13;113) are formed continuously through the rotary tool body (15; 115) from the front face (11;111) facing ahead. - A rotary tool according to claims 1 or 2
characterised in that the pins (12;112) are arranged on circles which are concentric to the axis of rotation (16) in planes which are perpendicular to the axis of rotation (16;116). - A rotary tool according to one of claims 1 to 3
characterised in that pins (12;112) arranged symmetrically to the axis of rotation (16;116) are situated on a concentric circle. - A rotary tool according to claim 1 or 2
characterised in that the pins (12;112) are arranged spirally. - A rotary tool according to one of claims 1 to 5
characterised in that the rotary tool body (15;115) has a symmetrical, central and continuous aperture (20;120) around the axis of rotation (16;116). - A rotary tool according to one of claims 1 to 6
characterised in that, by way of a sectional plane which is perpendicular to the axis of rotation (16;116), the rotary tool body (15;115) is constructed in two parts, a first half (31;131) with the front face (11;111) facing ahead and a second half (32;132) with a rear face (33) and with connecting surfaces (34,35;134,135) by which the two halves (31,32;131,132) lie flush against each other in the assembled state. - A rotary tool according to one of claims 1 to 7
characterised in that the front face (11;111) facing ahead is convex. - A rotary tool according to claim 6 or 7
characterised in that the cross-section of the central aperture (20;120) takes up the major part of the cross-sectional surface of the rotary tool body (15;115). - A rotary tool according to claim 9
characterised in that the pins (12;112) are arranged on a circle around the axis of rotation (16;116). - A rotary tool according to one of claims 7 to 10
characterised in that the apertures (13;113) are continuous only through the first half (31;131) of the rotary tool body (15;115). - A rotary tool according to one of claims 7 to 11
characterised in that radial elevations (40;140) are arranged on one of the connecting surfaces (34,35;134,135) of the two halves (31,32;131,132) which elevations engage corresponding recesses (41,141) in the connecting surface of the other half (32;132) or (31;131). - A rotary tool according to one of claims 7 to 12
characterised in that, on one of the connecting surfaces (34,35;134,135) of the two halves (31,32;131,132), a circular symmetrical elevation (50) is arranged around the central aperture (20;120) which elevation engages a corresponding recess (51) in the connecting surface of the other half (32;132) or (31;131). - A rotary tool according to one of claims 7 to 13
characterised in that the halves (31,32;131,132) of the rotary tool body (15;115) are firmly and releasably connected to each other with screws (21). - A rotary tool according to one of claims 1 to 14
characterised in that the pins (12;112) consist of boron nitride. - A rotary tool according to one of claims 1 to 15
characterised in that the apertures (13;113) are arranged parallel to the axis of rotation (16;116).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE9206657U | 1992-05-15 | ||
| DE9206657U DE9206657U1 (en) | 1992-05-15 | 1992-05-15 | Rotary tool with carbide inserts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0569985A1 EP0569985A1 (en) | 1993-11-18 |
| EP0569985B1 true EP0569985B1 (en) | 1997-08-06 |
Family
ID=6879583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93107808A Expired - Lifetime EP0569985B1 (en) | 1992-05-15 | 1993-05-13 | Rotating tool with hardmetal inserts |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0569985B1 (en) |
| AT (1) | ATE156400T1 (en) |
| DE (2) | DE9206657U1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10013738A1 (en) * | 2000-03-20 | 2001-10-11 | Tigra Hartstoff Gmbh | Cylinder drill with carbide cutting edges |
| DE10136094A1 (en) * | 2001-07-26 | 2003-02-20 | Tracto Technik | drilling |
| DE10161823A1 (en) * | 2001-12-15 | 2003-06-26 | Tigra Hartstoff Gmbh | Cylinder head drill or similar tool with hard metal cutting |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1806079A (en) * | 1923-11-05 | 1931-05-19 | Sullivan Machinery Co | Core drill |
| US2145466A (en) * | 1937-05-25 | 1939-01-31 | Bertis H Urschel | Rock drill |
| US2460673A (en) * | 1944-06-09 | 1949-02-01 | Irvine J Berscheid | Detachable bit |
| DE7402881U (en) * | 1974-01-29 | 1976-07-08 | Fried. Krupp Huettenwerke Ag, 4630 Bochum | DRILL HEAD FOR CORE OR DRILLING |
| US4085809A (en) * | 1977-01-10 | 1978-04-25 | Robert Lovell | Reconditionable drill bit assembly |
| DE8107768U1 (en) * | 1981-03-17 | 1981-10-01 | Firma Winfried Reithmeier, 8130 Starnberg | Core bit for drilling in masonry or the like. |
| DE8219045U1 (en) * | 1982-07-03 | 1983-01-20 | Schiess AG, 4000 Düsseldorf | DRILLING TOOL FOR DEEP HOLES |
| BR8701601A (en) * | 1986-03-13 | 1988-01-12 | Smith International | ROTARY CUTTERS FOR ROCK DRILLS |
| DE3637456A1 (en) * | 1986-06-09 | 1988-05-11 | Erich Wezel | Hollow drill bit |
| US4782903A (en) * | 1987-01-28 | 1988-11-08 | Strange William S | Replaceable insert stud for drilling bits |
| EP0379584A1 (en) * | 1988-05-23 | 1990-08-01 | VSESOJUZNY NAUCHNO-ISSLEDOVATELSKY INSTITUT TRANSPORTNOGO STROITELSTVA(TsNIIS) | Instrument for percussion-rotary drilling |
| DE3819462C1 (en) * | 1988-06-08 | 1990-05-23 | Johannes 4130 Moers De Radtke | Drilling head for making small-diameter and large-diameter boreholes |
| DE3911657A1 (en) * | 1989-04-10 | 1990-10-11 | Telefunken Electronic Gmbh | Semiconductor component with metallising on basic body - consists of four different materials for switching active semiconductor regions |
| DE3941609C1 (en) * | 1989-12-16 | 1991-10-24 | Johannes 4130 Moers De Radtke | Boring head for mining - has head and shaft provided with fluid flushing channels and tapering surface on head |
| DE4002907A1 (en) * | 1990-02-01 | 1991-08-08 | Leffer Stahl & App | Cylindrical cutting head forms extension of borehole drill pipe |
| DE4004814A1 (en) * | 1990-02-16 | 1991-08-22 | Westa Werkzeugbau | Drill for rock or concrete or earth - has drilling head consisting of individual points of hard metal soldered into head |
| DE9002460U1 (en) * | 1990-03-02 | 1990-05-03 | Drebo Werkzeugfabrik GmbH, 7963 Altshausen | Core drill |
| DE9110283U1 (en) * | 1991-08-20 | 1991-10-17 | Töpfer, Rainer, 2802 Ottersberg | Core bit |
-
1992
- 1992-05-15 DE DE9206657U patent/DE9206657U1/en not_active Expired - Lifetime
-
1993
- 1993-05-13 DE DE59307048T patent/DE59307048D1/en not_active Expired - Fee Related
- 1993-05-13 AT AT93107808T patent/ATE156400T1/en not_active IP Right Cessation
- 1993-05-13 EP EP93107808A patent/EP0569985B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE59307048D1 (en) | 1997-09-11 |
| DE9206657U1 (en) | 1993-09-16 |
| ATE156400T1 (en) | 1997-08-15 |
| EP0569985A1 (en) | 1993-11-18 |
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