EP1185390A1 - Expansion chuck tool - Google Patents

Expansion chuck tool

Info

Publication number
EP1185390A1
EP1185390A1 EP00993834A EP00993834A EP1185390A1 EP 1185390 A1 EP1185390 A1 EP 1185390A1 EP 00993834 A EP00993834 A EP 00993834A EP 00993834 A EP00993834 A EP 00993834A EP 1185390 A1 EP1185390 A1 EP 1185390A1
Authority
EP
European Patent Office
Prior art keywords
base body
expansion
expansion sleeve
tool
tool according
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.)
Withdrawn
Application number
EP00993834A
Other languages
German (de)
French (fr)
Inventor
Herbert Clauss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schunk GmbH and Co KG
Original Assignee
Schunk GmbH and Co KG
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 Schunk GmbH and Co KG filed Critical Schunk GmbH and Co KG
Publication of EP1185390A1 publication Critical patent/EP1185390A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/24—Chucks characterised by features relating primarily to remote control of the gripping means
    • B23B31/30—Chucks characterised by features relating primarily to remote control of the gripping means using fluid-pressure means in the chuck
    • B23B31/305—Chucks characterised by features relating primarily to remote control of the gripping means using fluid-pressure means in the chuck the gripping means is a deformable sleeve

Definitions

  • the present invention relates to an expansion clamping tool with a base body which can be fixed to a work spindle of a machine tool and an expansion sleeve which is inserted into or surrounds the base body to form a closed annular space and is soldered to the base body at least at its axial end regions, the annular space being more elastic Deformation of the expansion sleeve can be acted upon by a hydraulic medium in order to achieve a clamping effect.
  • Expansion clamping tools of this type are known in different embodiments and are primarily used to fix a tool shank such as a drill or milling shank in the work spindle of a corresponding machine tool.
  • the expansion sleeve is usually soldered to the base body at its axial end regions, in order to produce a firm connection to form the closed annular space.
  • the problem with this solution is that the connection points are subjected to severe stresses due to the alternating loads during operation, which can lead to the solder joints breaking.
  • the base body is a thick-walled component compared to the thin-walled expansion sleeve, so that thermal stresses occur in the cooling phase after high-temperature soldering, which can also result in the solder joint cracking.
  • the object of the present invention is to design a clamping tool of the type mentioned at the outset in such a way that a secure connection between the base body and the expansion sleeve is ensured.
  • this object is essentially achieved in that the expansion sleeve and the base body unite at least at their connecting spindle-like connection area the components in the radial direction form a form-fitting connection. Due to the positive connection provided according to the invention, the radial forces which occur in the cooling phase during the manufacture of the solder joints and when the annular space between the base body and the expansion sleeve are acted upon are absorbed with the result that the solder connections are not or only to a very small extent by these forces be claimed. Damage to the soldered connections can therefore be reliably avoided.
  • the expansion sleeve can also be made significantly thinner at its tool-side end area, as a result of which the oil chamber can be structurally moved further to the tool side. This ensures that the cantilever length is shorter and the arrangement is accordingly stiffer.
  • the expansion sleeve and the base body likewise form a positive connection on the connecting region near the working spindle, which fixes the components to one another in the radial direction. Because the expansion sleeve is thus positively integrated into the base body at its two axial end regions, the problems which occur when clamping so-called wistle-notch shafts and which have already been explained above can be significantly reduced, ie the risk of breakages is significantly reduced.
  • corresponding engagement means are preferably provided on the mutually facing end faces of the two components, which are designed as groove / projection connections.
  • annular groove is provided on the tool-side end face of the base body and at least one web engaging in the annular groove, in particular an annular web, is provided on the expansion sleeve.
  • connection at the end region near the work spindle can be produced by an annular groove provided on the base body, into which at least one web, in particular an annular web of the expansion sleeve, engages in a form-fitting manner.
  • the annular groove and the web engaging therewith expediently have a rectangular or a triangular cross section. Any other cross-section is also conceivable, as long as a positive connection is made that avoids relative radial movements of the base body and the expansion sleeve relative to one another.
  • Figure 1 shows a first embodiment of a stretching tool according to the invention in longitudinal section
  • Figure 2 shows a further embodiment of a stretching tool according to the present invention in longitudinal section.
  • the expansion chucks 1 each comprise a base body 2 made of a dimensionally stable material, which, in a manner known per se, has a fastening cone for clamping on a rotary driven work spindle of a machine tool on its left-hand end region, which is not shown.
  • a connecting shaft 3 is provided with a central axial bore 4, into which an expansion sleeve 5 is inserted.
  • the expansion sleeve 5 forms a receptacle 6 into which a cylindrical shank of a tool such as a drill or milling cutter can be inserted.
  • annular space 7 is formed between the expansion sleeve 5 and the base body 2, which surrounds the receptacle 6 and is aligned coaxially with the latter.
  • the annular space 7, the axial length of which corresponds approximately to the required clamping range, is toward the receptacle 6 from a relatively narrow inner wall 8 of the expansion sleeve 5 and radially outward from the wall of the base body 2, the wall thickness of which is several times greater than the wall thickness of the inner wall 8 is limited.
  • the annular space 7 is filled with a hydraulic medium such as oil and is not in shown way via a channel formed in the base body 2 in connection with a hydraulic medium source through which it can be pressurized for clamping a tool.
  • the pressure medium source can be formed in a manner known per se from a cylinder space formed in the base body 2, which is closed at the end by a piston-like actuator which can be screwed into the cylinder space to increase the pressure or can be screwed out of the cylinder space to reduce the pressure.
  • This hydraulic pressure is transmitted via the channel to the annular space 7 and causes an elastic bulging of the inner wall 8 inwards until it firmly encloses the tool shank inserted in the receptacle 5.
  • the expansion sleeve 5 is firmly connected to the base body 2 by being soldered to the base body 2 at its axial end regions in a manner known per se. According to the invention, it is now provided that the expansion sleeve 5 also forms a positive connection with the base body 2 at the connection points.
  • an annular groove 9 is provided in the end face of the base body 2 on the tool-side end region, into which a corresponding annular web 10 of the expansion sleeve 5 engages in a form-fitting manner.
  • the expansion sleeve 5 has an annular web 11 on its end face on the work spindle, which engages in a corresponding annular groove 12 in the base body 2.
  • the form-fitting connections between the base body 2 and the expansion sleeve 5 ensure that radial forces which occur during operation when pressure is applied of the annular space 7 occur and try to separate the two components 2, 5 from each other, do not strain the solder joints.
  • the interlocking connections on the tool-side end of the expansion chuck 1 are formed in a corresponding manner by an annular groove 9 of rectangular cross section provided on the base body 2, which comes into engagement with a corresponding annular web 10 on the expansion sleeve 5 , Differences only exist with regard to the positive connection formed on the spindle-side connection area.
  • this is formed by an annular groove 12 with a rectangular cross section provided on the base body 2 and a corresponding annular web 11 on the expansion sleeve, while in the embodiment shown in FIG. 2 the annular groove 12 on the base body and the annular web 11 engaged therewith have a triangular cross section.
  • the triangular cross section has the advantage that it forms a guide when the expansion sleeve 5 is inserted into the base body 2.

Abstract

The invention relates to an expansion chuck tool having a base body (2) that can be fixed to a work spindle of a machine tool. The inventive expansion chuck tool also comprises an expansion sleeve (5) which is inserted into said base body (2) and thus results in a closed annular space (7) or surrounds said body and is soldered to the base body (2) at least in the axial end regions (2) thereof. The expansion sleeve (5) and the base body (2) form a positive locking at least in the connection area which is not situated in the proximity of the work spindle. The components (2, 5) are fixed to each other in the radial direction by means of said positive locking.

Description

Beschreibung:Description:
DehnspannwerkzeugDehnspannwerkzeug
Die vorliegende Erfindung betrifft ein Dehnspannwerkzeug mit einem an einer Arbeitsspindel einer Werkzeugmaschine fixierbaren Grundkörper und einer Dehnbüchse, die unter Bildung eines geschlossenen Ringraums in den Grundkörper eingesetzt ist oder diesen umgibt und zumindest an ihren axialen Endbereichen mit dem Grundkörper verlötet ist, wobei der Ringraum unter elastischer Verformung der Dehnbüchse mit einem Hydraulikmittel beaufschlagbar ist, um eine Spannwirkung zu erzielen.The present invention relates to an expansion clamping tool with a base body which can be fixed to a work spindle of a machine tool and an expansion sleeve which is inserted into or surrounds the base body to form a closed annular space and is soldered to the base body at least at its axial end regions, the annular space being more elastic Deformation of the expansion sleeve can be acted upon by a hydraulic medium in order to achieve a clamping effect.
Dehnspannwerkzeuge dieser Art sind in unterschiedlichen Ausführungsformen bekannt und werden in erster Linie eingesetzt, um einen Werkzeugschaft wie beispielsweise einen Bohrer- oder Fräserschaft in der Arbeitsspindel einer entsprechenden Werkzeugmaschine zu fixieren. Man unterscheidet zwei Arten von Dehnspannwerkzeugen, nämlich zum einen sogenannte Spanndorne, bei denen die Dehnbüchse den Grundkörper umgibt und sich bei Druckbeaufschlagung des Ringraums zur Spannung in einer Bohrung radial nach außen aufweitet, und zum anderen Spannfutter, bei denen die Dehnbüchse in den Grunkörper eingesetzt ist und zum Spannen einer Welle oder eines Schaftes radial nach innen verformt wird.Expansion clamping tools of this type are known in different embodiments and are primarily used to fix a tool shank such as a drill or milling shank in the work spindle of a corresponding machine tool. A distinction is made between two types of expansion tools, namely the so-called mandrels, in which the expansion sleeve surrounds the base body and expands radially outwards when the annular space is pressurized to tension in a bore, and the other chuck, in which the Expansion sleeve is inserted into the green body and is deformed radially inwards for tensioning a shaft or a shaft.
Bei den bekannten Dehnspannwerkzeugen ist die Dehnbüchse an ihren axialen Endbereichen mit dem Grundkörper in der Regel verlötet, um eine feste Verbindung unter Bildung des geschlossenen Ringraums herzustellen. Problematisch an dieser Lösung ist, daß die Verbindungsstellen durch die Wechselbelastungen im Betrieb starken Beanspruchungen unterworfen sind, die zum Bruch der Lötstellen führen können. Eine weitere Problematik besteht darin, daß der Grundkörper ein im Vergleich zur dünnwandigen Dehnbüchse dickwandiges Bauteil darstellt, so daß in der Abkühlphase nach dem Hochtemperaturlöten Wärmespannungen auftreten, die ebenfalls ein Reißen der Lötstelle zur Folge haben können. Beim Spannen von sogenannten Wistle-Notch- Schäften mit herkömmlichen Spannwerkzeugen kann es ferner aufgrund der bei diesen Schäften vorhandenen Ausnehmungen zu Ausbeulungen der Dehnbüchse und damit zu Brüchen kommen.In the known expansion clamping tools, the expansion sleeve is usually soldered to the base body at its axial end regions, in order to produce a firm connection to form the closed annular space. The problem with this solution is that the connection points are subjected to severe stresses due to the alternating loads during operation, which can lead to the solder joints breaking. Another problem is that the base body is a thick-walled component compared to the thin-walled expansion sleeve, so that thermal stresses occur in the cooling phase after high-temperature soldering, which can also result in the solder joint cracking. When clamping so-called wistle-notch shafts with conventional clamping tools, bulges of the expansion sleeve and thus breakage can also occur due to the recesses present in these shafts.
Aufgabe der vorliegenden Erfindung ist es, ein Spannwerkzeug der eingangs genannten Art so auszugestalten, daß eine sichere Verbindung von Grundkörper und Dehnbüchse gewährleistet ist.The object of the present invention is to design a clamping tool of the type mentioned at the outset in such a way that a secure connection between the base body and the expansion sleeve is ensured.
Diese Aufgabe ist erfindungsgemäß im wesentlichen dadurch gelöst, daß die Dehnbüchse und der Grundkörper zumindest an ihrem arbeitsspindelfemen Verbindungsbereich einen die Bauteile in radialer Richtung aneinander fixierenden Formschluß bilden. Durch den erfindungsgemäß vorgesehenen Formschluß werden die Radialkräfte, die in der Abkühlphase bei der Herstellung der Lötstellen sowie bei einer Beaufschlagung des Ringraums zwischen dem Grundkörper und der Dehnbüchse auftreten, aufgefangen mit der Folge, daß die Lötverbindungen nicht oder in nur sehr geringem Maß durch diese Kräfte beansprucht werden. Beschädigungen der Lötverbindungen können daher zuverlässig vermieden werden.According to the invention, this object is essentially achieved in that the expansion sleeve and the base body unite at least at their connecting spindle-like connection area the components in the radial direction form a form-fitting connection. Due to the positive connection provided according to the invention, the radial forces which occur in the cooling phase during the manufacture of the solder joints and when the annular space between the base body and the expansion sleeve are acted upon are absorbed with the result that the solder connections are not or only to a very small extent by these forces be claimed. Damage to the soldered connections can therefore be reliably avoided.
Durch den vorgesehenen Formschluß kann die Dehnbüchse an ihrem werkzeugseitigen Endbereich auch deutlich dünner ausgebildet werden, wodurch die Ölkammer konstruktiv weiter zur Werkzeugseite verlagert werden kann. Hierdurch wird erreicht, daß die Auskraglänge geringer und entsprechend die Anordnung steifer wird.Due to the form fit provided, the expansion sleeve can also be made significantly thinner at its tool-side end area, as a result of which the oil chamber can be structurally moved further to the tool side. This ensures that the cantilever length is shorter and the arrangement is accordingly stiffer.
Gemäß einer Ausführungsform der Erfindung ist vorgesehen, daß die Dehnbüchse und der Grundkörper an ihrem arbeits- spindelnahen Verbindungsbereich ebenfalls einen die Bauteile in radialer Richtung aneinander fixierenden Formschluß bilden. Dadurch, daß somit die Dehnbüchse an ihren beiden axialen Endbereichen formschlüssig in den Grundkörper eingebunden ist, kann die beim Spannen von sogenannten Wistle-Notch-Schäften auftretende und zuvor bereits erläuterte Problematik deutlich herabgesetzt werden, d.h. die Gefahr von Brüchen wird deutlich vermindert. Zur Herstellung der Formschlußverbindungen zwischen Grundkörper und Dehnbüchse sind vorzugsweise an den zueinander weisenden Stirnflächen der beiden Bauteile entsprechende Eingriffsmittel vorgesehen, die als Nut/Vorsprung-Verbindungen ausgebildet sind. Gemäß einer bevorzugten Ausführungsform ist dabei an der werkzeugsei- tigen Stirnfläche des Grundkörpers eine Ringnut und an der Dehnbüchse wenigstens ein in die Ringnut eingreifender Steg, insbesondere ein Ringsteg, vorgesehen. In ähnlicher Weise kann die Verbindung am arbeitsspindelnahen Endbereich durch eine am Grundkörper vorgesehene Ringnut, in die wenigstens ein Steg, insbesondere ein Ringsteg der Dehnbüchse formschlüssig eingreift, hergestellt werden. Die Ringnut und der damit in Eingriff kommende Steg haben zweckmäßigerweise einen rechteckigen oder einen dreieckigen Querschnitt. Jeder andere Querschnitt ist aber ebenso denkbar, solange ein Formschluß hergestellt wird, der relative Radialbewegungen von Grundkörper und Dehnbüchse zueinander vermeidet.According to one embodiment of the invention, it is provided that the expansion sleeve and the base body likewise form a positive connection on the connecting region near the working spindle, which fixes the components to one another in the radial direction. Because the expansion sleeve is thus positively integrated into the base body at its two axial end regions, the problems which occur when clamping so-called wistle-notch shafts and which have already been explained above can be significantly reduced, ie the risk of breakages is significantly reduced. To produce the positive connections between the base body and the expansion sleeve, corresponding engagement means are preferably provided on the mutually facing end faces of the two components, which are designed as groove / projection connections. According to a preferred embodiment, an annular groove is provided on the tool-side end face of the base body and at least one web engaging in the annular groove, in particular an annular web, is provided on the expansion sleeve. In a similar manner, the connection at the end region near the work spindle can be produced by an annular groove provided on the base body, into which at least one web, in particular an annular web of the expansion sleeve, engages in a form-fitting manner. The annular groove and the web engaging therewith expediently have a rectangular or a triangular cross section. Any other cross-section is also conceivable, as long as a positive connection is made that avoids relative radial movements of the base body and the expansion sleeve relative to one another.
Hinsichtlich weiterer Ausgestaltungen der Erfindung wird auf die Unteransprüche sowie die nachfolgende Beschreibung eines Ausführungsbeispiels unter Bezugnahme auf die beiliegende Zeichnung verwiesen. In der Zeichnung zeigtWith regard to further refinements of the invention, reference is made to the subclaims and the following description of an exemplary embodiment with reference to the accompanying drawing. In the drawing shows
Figur 1 eine erste Ausführungsform eines erfindungsgemäßen Dehnspannwerkzeugs im Längsschnitt und Figur 2 eine weitere Ausführungsform eines Dehnspannwerkzeugs gemäß der vorliegenden Erfindung im Längsschnitt.Figure 1 shows a first embodiment of a stretching tool according to the invention in longitudinal section and Figure 2 shows a further embodiment of a stretching tool according to the present invention in longitudinal section.
In den Figuren 1 und 2 sind zwei Ausführungsformen eines als Steilkegelwerkzeughalter ausgebildeten Dehnspannfutters 1 gemäß der vorliegenden Erfindung im Längsschnitt dargestellt. Die Dehnspannfutter 1 umfassen jeweils einen Grundkörper 2 aus einem formsteifen Material, der an seinem nicht dargestellten, linksseitigen Endbereich in an sich bekannter Weise einen Befestigungskonus zur Einspan- nung an einer drehangetriebenen Arbeitsspindel einer Werkzeugmaschine aufweist. An dem anderen Ende des Grundkörpers 2 ist ein Anschlußschaft 3 mit einer zentralen Axialbohrung 4 vorgesehen, in die eine Dehnbüchse 5 eingesetzt ist. Die Dehnbüchse 5 bildet dabei eine Aufnahme 6, in die ein zylindrischer Schaft eines Werkzeugs wie beispielsweise eines Bohrers oder Fräsers eingeschoben werden kann.1 and 2 show two embodiments of an expansion chuck 1 designed as a steep taper tool holder according to the present invention in longitudinal section. The expansion chucks 1 each comprise a base body 2 made of a dimensionally stable material, which, in a manner known per se, has a fastening cone for clamping on a rotary driven work spindle of a machine tool on its left-hand end region, which is not shown. At the other end of the base body 2, a connecting shaft 3 is provided with a central axial bore 4, into which an expansion sleeve 5 is inserted. The expansion sleeve 5 forms a receptacle 6 into which a cylindrical shank of a tool such as a drill or milling cutter can be inserted.
Zwischen der Dehnbüchse 5 und dem Grundkörper 2 ist ein Ringraum 7 ausgebildet, der die Aufnahme 6 umgibt und koaxial zu dieser ausgerichtet ist. Der Ringraum 7, dessen axiale Länge etwa dem erforderlichen Spannbereich entspricht, wird zur Aufnahme 6 hin von einer relativ schmalen Innenwand 8 der Dehnbüchse 5 und radial nach außen von der Wandung des Grundkörpers 2, dessen Wandstärke um ein mehrfaches größer als die Wandstärke der Innenwand 8 ist, begrenzt. Der Ringraum 7 ist mit einem Hydraulikmittel wie beispielsweise Öl gefüllt und steht in nicht dargestellter Weise über einen im Grundkörper 2 ausgebildeten Kanal mit einer Hydraulikmittelquelle in Verbindung, durch die er zum Spannen eines Werkzeugs mit Druck beaufschlagt werden kann. Die Druckmittelquelle kann in an sich bekannter Weise von einem im Grundkörper 2 ausgebildeten Zylinderraum gebildet sein, der endseitig durch ein kolbenartiges Stellorgan verschlossen ist, das zur Erhöhung des Drucks in den Zylinderraum eingeschraubt bzw. zur Verringerung des Drucks aus dieser heraus geschraubt werden kann. Dieser hydraulische Druck wird über den Kanal zum Ringraum 7 übertragen und bewirkt eine elastische Auswölbung der Innenwand 8 nach innen, bis diese den in die Aufnahme 5 eingesetzten Werkzeugschaft fest umschließt.An annular space 7 is formed between the expansion sleeve 5 and the base body 2, which surrounds the receptacle 6 and is aligned coaxially with the latter. The annular space 7, the axial length of which corresponds approximately to the required clamping range, is toward the receptacle 6 from a relatively narrow inner wall 8 of the expansion sleeve 5 and radially outward from the wall of the base body 2, the wall thickness of which is several times greater than the wall thickness of the inner wall 8 is limited. The annular space 7 is filled with a hydraulic medium such as oil and is not in shown way via a channel formed in the base body 2 in connection with a hydraulic medium source through which it can be pressurized for clamping a tool. The pressure medium source can be formed in a manner known per se from a cylinder space formed in the base body 2, which is closed at the end by a piston-like actuator which can be screwed into the cylinder space to increase the pressure or can be screwed out of the cylinder space to reduce the pressure. This hydraulic pressure is transmitted via the channel to the annular space 7 and causes an elastic bulging of the inner wall 8 inwards until it firmly encloses the tool shank inserted in the receptacle 5.
Die Dehnbüchse 5 ist mit dem Grundkörper 2 fest verbunden, indem sie an ihren axialen Endbereichen mit dem Grundkörper 2 in an sich bekannter Weise verlötet ist. Erfindungsgemäß ist nun vorgesehen, daß die Dehnbüchse 5 mit dem Grundkörper 2 an den Verbindungsstellen zusätzlich einen Formschluß bildet. An dem werkzeugseitigen Endbereich ist hierzu in der Stirnfläche des Grundkörpers 2 eine Ringnut 9 vorgesehen, in die ein entsprechender Ringsteg 10 der Dehnbüchse 5 formschlüssig eingreift. In entsprechender Weise weist die Dehnbüchse 5 an ihrer ar- beitsspindelseitigen Stirnfläche einen Ringsteg 11 auf, der in eine korrespondierende Ringnut 12 des Grundkörpers 2 eingreift. Durch die Formschlußverbindungen zwischen Grundkörper 2 und Dehnbüchse 5 wird erreicht, daß Radialkräfte, welche im Betrieb bei einer Druckbeaufschlagung des Ringraums 7 auftreten und die beiden Bauteile 2 , 5 voneinander zu trennen suchen, die Lötstellen nicht belasten.The expansion sleeve 5 is firmly connected to the base body 2 by being soldered to the base body 2 at its axial end regions in a manner known per se. According to the invention, it is now provided that the expansion sleeve 5 also forms a positive connection with the base body 2 at the connection points. For this purpose, an annular groove 9 is provided in the end face of the base body 2 on the tool-side end region, into which a corresponding annular web 10 of the expansion sleeve 5 engages in a form-fitting manner. In a corresponding manner, the expansion sleeve 5 has an annular web 11 on its end face on the work spindle, which engages in a corresponding annular groove 12 in the base body 2. The form-fitting connections between the base body 2 and the expansion sleeve 5 ensure that radial forces which occur during operation when pressure is applied of the annular space 7 occur and try to separate the two components 2, 5 from each other, do not strain the solder joints.
Bei den in den Figuren 1 und 2 dargestellten Ausführungsformen sind die Formschlußverbindungen am werkzeugseiti- gen Ende des Dehnspannfutters 1 in übereinstimmender Weise durch eine am Grundkörper 2 vorgesehene Ringnut 9 rechteckigen Querschnitts, die mit einem korrespondierenden Ringsteg 10 an der Dehnbüchse 5 in Eingriff kommt, gebildet. Unterschiede bestehen lediglich hinsichtlich des am spindelseitigen Verbindungsbereich gebildeten Formschlußes. Dieser wird bei der in Figur 1 dargestellten Ausführungsform durch eine am Grundkörper 2 vorgesehene Ringnut 12 mit rechteckigem Querschnitt und einen entsprechenden Ringsteg 11 an der Dehnbüchse gebildet, während bei der in Figur 2 dargestellten Ausführungsform die grundkörperseitige Ringnut 12 und der damit in Eingriff stehende Ringsteg 11 einen dreieckigen Querschnitt besitzen. Der dreieckige Querschnitt hat den Vorteil, daß er beim Einsetzen der Dehnbüchse 5 in den Grundkörper 2 eine Führung bildet. In the embodiments shown in FIGS. 1 and 2, the interlocking connections on the tool-side end of the expansion chuck 1 are formed in a corresponding manner by an annular groove 9 of rectangular cross section provided on the base body 2, which comes into engagement with a corresponding annular web 10 on the expansion sleeve 5 , Differences only exist with regard to the positive connection formed on the spindle-side connection area. In the embodiment shown in FIG. 1, this is formed by an annular groove 12 with a rectangular cross section provided on the base body 2 and a corresponding annular web 11 on the expansion sleeve, while in the embodiment shown in FIG. 2 the annular groove 12 on the base body and the annular web 11 engaged therewith have a triangular cross section. The triangular cross section has the advantage that it forms a guide when the expansion sleeve 5 is inserted into the base body 2.

Claims

Ansprüche :Dehnspannwerkzeug Requirements: expansion tool
1. Dehnspannwerkzeug mit einem an einer Arbeitsspindel einer Werkzeugmaschine fixierbaren Grundkörper (2) und einer Dehnbüchse (5), die unter Bildung eines geschlossenen Ringraums (7) in den Grundkörper (2) eingesetzt ist oder diesen umgibt und zumindest an ihren axialen Endbereichen mit dem Grundkörper (2) verlötet ist, wobei der Ringraum (7) unter elastischer Verformung der Dehnbüchse (5) mit einem Hydraulikmittel beaufschlagbar ist, um eine Spannwirkung zu erzielen, dadurch gekennzeichnet, daß die Dehnbüchse (5) und der Grundkörper (2) zumindest an ihrem arbeitsspindelfer- nen Verbindungsbereich einen die Bauteile (2, 5) in radialer Richtung aneinander fixierenden Formschluß bilden .1. stretching tool with a fixable on a work spindle of a machine tool base body (2) and an expansion sleeve (5) which is used to form a closed annular space (7) in the base body (2) or surrounds it and at least at its axial end areas with the Base body (2) is soldered, the annular space (7) with elastic deformation of the expansion sleeve (5) can be acted upon by a hydraulic medium in order to achieve a clamping effect, characterized in that the expansion sleeve (5) and the base body (2) at least on Its connection area remote from the work spindle forms a positive connection that fixes the components (2, 5) to one another in the radial direction.
2. Dehnspannwerkzeug nach Anspruch 1 , dadurch gekennzeichnet, daß die Dehnbüchse (5) und der Grundkörper (2) an ihrem arbeitsspindelnahen Verbindungsbereich einen die Bauteile (2, 5) in radialer Richtung aneinander fixierenden Formschluß bilden. 2. Expansion clamping tool according to claim 1, characterized in that the expansion sleeve (5) and the base body (2) form a component (2, 5) in the radial direction which fixes one another in the radial direction on their connection area near the working spindle.
3. Dehnspannwerkzeug nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß an den zueinander weisenden Stirnflächen von Grundkörper (2) und Dehnbüchse (5) zusammenwirkende Eingriffsmittel, die als Nut/Vorsprung- Verbindungen ausgebildet sind, vorgesehen sind.3. Expansion tool according to claim 1 or 2, characterized in that on the mutually facing end faces of the base body (2) and expansion sleeve (5) cooperating engagement means which are designed as groove / projection connections are provided.
4. Dehnspannwerkzeug nach Anspruch 3 , dadurch gekennzeichnet, daß an der werkzeugseitigen Stirnfläche des Grundkörpers (2) eine Ringnut (9) und an der Dehnbüchse (5) wenigstens ein in die Ringnut eingreifender Steg, insbesondere ein Ringsteg (10), vorgesehen ist.4. Expansion tool according to claim 3, characterized in that on the tool-side end face of the base body (2) has an annular groove (9) and on the expansion sleeve (5) at least one web engaging in the annular groove, in particular an annular web (10), is provided.
5. Dehnspannwerkzeug nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß der Formschluß am arbeits- spindelnahen Verbindungsbereich durch eine am Grundkörper (2) vorgesehene Ringnut (12) und einen in die5. Stretching tool according to one of the preceding claims, characterized in that the positive connection on the work spindle near the connection area by an on the base body (2) provided annular groove (12) and one in the
Ringnut (12) formschlüssig eingreifenden Steg, insbesondere Ringsteg (11) der Dehnbüchse (4) gebildet wird.Ring groove (12) engaging web, in particular ring web (11) of the expansion sleeve (4) is formed.
6. Dehnspannwerkzeug nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Ringnut (9, 12) einen rechteckigen Querschnitt besitzt.6. Expansion tool according to one of the preceding claims, characterized in that the annular groove (9, 12) has a rectangular cross section.
7. Dehnspannwerkzeug nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Ringnut (12) einen dreieckigen Querschnitt besitzt. 7. Expansion tool according to one of claims 1 to 6, characterized in that the annular groove (12) has a triangular cross section.
EP00993834A 2000-02-16 2000-10-26 Expansion chuck tool Withdrawn EP1185390A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10007074 2000-02-16
DE2000107074 DE10007074A1 (en) 2000-02-16 2000-02-16 Expansion tool
PCT/EP2000/010534 WO2001060556A1 (en) 2000-02-16 2000-10-26 Expansion chuck tool

Publications (1)

Publication Number Publication Date
EP1185390A1 true EP1185390A1 (en) 2002-03-13

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Application Number Title Priority Date Filing Date
EP00993834A Withdrawn EP1185390A1 (en) 2000-02-16 2000-10-26 Expansion chuck tool

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Country Link
EP (1) EP1185390A1 (en)
JP (1) JP2003522650A (en)
CN (1) CN1347353A (en)
DE (1) DE10007074A1 (en)
WO (1) WO2001060556A1 (en)

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Also Published As

Publication number Publication date
JP2003522650A (en) 2003-07-29
WO2001060556A1 (en) 2001-08-23
DE10007074A1 (en) 2001-09-06
CN1347353A (en) 2002-05-01

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