WO1998004377A2 - Work spindle for a machine tool - Google Patents

Work spindle for a machine tool Download PDF

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Publication number
WO1998004377A2
WO1998004377A2 PCT/EP1997/003659 EP9703659W WO9804377A2 WO 1998004377 A2 WO1998004377 A2 WO 1998004377A2 EP 9703659 W EP9703659 W EP 9703659W WO 9804377 A2 WO9804377 A2 WO 9804377A2
Authority
WO
WIPO (PCT)
Prior art keywords
clamping
rod head
tool
measuring beam
receiver
Prior art date
Application number
PCT/EP1997/003659
Other languages
German (de)
French (fr)
Other versions
WO1998004377A3 (en
Inventor
Heinz Kempkensteffen
Original Assignee
Ima Montagetechnik Gmbh
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 Ima Montagetechnik Gmbh filed Critical Ima Montagetechnik Gmbh
Priority to EP97936635A priority Critical patent/EP0876237A2/en
Publication of WO1998004377A2 publication Critical patent/WO1998004377A2/en
Publication of WO1998004377A3 publication Critical patent/WO1998004377A3/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/54—Arrangements or details not restricted to group B23Q5/02 or group B23Q5/22 respectively, e.g. control handles
    • B23Q5/58—Safety devices
    • 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
    • B23B31/26—Chucks characterised by features relating primarily to remote control of the gripping means using mechanical transmission through the working-spindle
    • B23B31/261—Chucks characterised by features relating primarily to remote control of the gripping means using mechanical transmission through the working-spindle clamping the end of the toolholder shank
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/002—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring the holding action of work or tool holders

Definitions

  • the invention relates to a work spindle for a machine tool with a clamping device having a clamping device for tools with hollow shaft taper and with a sensor device detecting the clamping position of the clamping rod head of the type specified in the preamble of claim 1.
  • Such work spindles are operated in modern machine tools with very high speeds, which lie in the size order of 20 000 min _1.
  • the tool must rest with its stop collar on the associated stop of the clamping device of the tool holder, which is done by tightening the tool via the clamping elements engaging in its hollow shaft cone, to which a corresponding tensile force is exerted by means of the clamping rod and the clamping springs acting on the clamping rod.
  • the ejection cylinder releases the clamping rod head, and it can be determined from the axial position of the released clamping rod head whether the tool held by the clamping device has assumed its correct clamping position. If this is not the case, the work spindle must not start up due to the possible unbalance.
  • the aim is to detect the upper end position of the tension rod head as precisely as possible, for which so-called initiators are used in a known design of generic work spindles.
  • initiators are used in a known design of generic work spindles.
  • These are inductive proximity switches which are arranged in the radial direction of the tension rod at the height of the tension rod head.
  • these initiators must be adjusted very precisely because the hysteresis of the inductive proximity switches alone causes inaccuracies.
  • the entire clamping device of a work spindle settles, which usually leads to the clamping rod head moving upwards when the tool is properly clamped. This is an error condition for the initiators, once they are firmly adjusted, whereupon the spindle start is not released despite the properly clamped tool. The entire machine tool can therefore only be put into operation again after the initiators have been readjusted.
  • the object of the invention is to create a work spindle of the generic type in which the sensor device measures the axial position of the tension rod head in the clamping position in relation to a fixed point on the work spindle and from the measured value signal taking into account the influence of changes, the release signal for the spindle start is formed.
  • This object is achieved in a work spindle of the generic type according to the invention by the characterizing features of claim 1.
  • the measuring beam which is aligned either coaxially, axially parallel or obliquely to the spindle axis with a directional component parallel thereto, provides an exact measured value for the distance between the fixed location on the working spindle and the clamping rod head in its clamping position, the can be compared with a reference value in the evaluation unit. If the measured length value determined via the measuring beam changes and the tool concerned is still properly clamped in the clamping position of the clamping rod, then the reference value stored in the evaluation unit can be easily adapted to this.
  • the invention is explained in more detail below with reference to the drawing using an exemplary embodiment.
  • the drawing shows a schematic longitudinal section through a work spindle for a machine tool.
  • a tool holder 1 can be seen at the lower end of the work spindle, which is equipped with a clamping device in order to be able to hold tools 2 which have a radial stop collar 3 and a hollow shaft taper 5.
  • the tool 2 rests with its stop collar 3 against a stop 4, such as a lower stop surface of the tool holder 1, whereby the axial position of the hollow shaft taper 5 in a corresponding hollow taper 16 of the tool holder 1 is predetermined.
  • clamping elements 6 engage the hollow shaft 5 of the tool 1 and exert a tensile force on the tool 2 in order to hold it securely in its stop collar 3 on the stop 4 of the tool holder 1.
  • the clamping elements 6 are essentially movable inwards in the radial direction with their engaging ends. The outwardly spread position of the clamping elements 6 is accordingly their clamping position.
  • the axial tensile force required for clamping the respective tool 2 is transmitted to the clamping elements 6 by a clamping rod 7 which is guided coaxially through the work spindle.
  • the tension rod 7 is acted upon by coaxially surrounding springs 8 which act on the tension rod 7 in such a way that the latter is pressed upwards when the work spindle is oriented vertically.
  • Clamping rod 7 can be moved down to the tool holder 1, and an ejection cylinder 10 is used, which is arranged coaxially with the clamping rod 7 above it and acts on a clamping rod head 9 formed at the upper end of the clamping rod 7.
  • the clamping rod head 9 In the clamping position, in which the tool 2 is properly clamped in the tool holder 1, the clamping rod head 9 assumes an upper end position, which is taken as a reference for releasing the start of the work spindle. For this purpose, the distance of the spindle head 9 from a fixed location on the work spindle is measured and compared with a predetermined length value.
  • the sensor device 11 has an optical transmitter 12 and an optical receiver 13, the transmitter 12 generating an optical measuring beam 14, which passes coaxially downward through the ejection cylinder 10.
  • the ejection cylinder 10 has an axially continuous bore 15 which opens at the lower end of the ejection cylinder 10 towards the tension rod head 9.
  • the optical measuring beam 14 thus strikes the tension rod head 9 and is reflected by it, so that the reflected part of the measuring beam 14 strikes the receiver 13 of the sensor unit 11.
  • the length of the measuring beam between the sensor device 11 and the tension rod head 9 can be determined in an evaluation unit, not shown in the drawing, for which different methods are sufficiently known. It is crucial that a change in the axial position of the tension rod head 9 is reliably detected further away from the tool holder 1, which is due to the entire clamping device being set and has no influence on a correct clamping position of the tool 2. In this way, the length value determined in the evaluation unit via the measuring beam can be compared with a reference value which, depending on the axial position changes of the tension rod head 9, is newly specified or immediately programmed differently in order to match the start-up release signal for if the length value supplied by the measuring beam and the reference value match Generate work spindle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machine Tool Sensing Apparatuses (AREA)
  • Gripping On Spindles (AREA)

Abstract

Such a work spindle has a clamping device with a clamping rod (7) that is spring-loaded and acts on clamping elements (6) which can engage in a hollow shaft taper of the corresponding tool (2). The correct chucked position of the tool (2) that has been mounted is determined by means of the axial position of the clamping-rod head (9), using a sensor facility (11) that generates a release signal for spindle start-up. The sensor facility (11) comprises a sender (12) and a receiver (13) for a measurement beam (14), whose length can be determined in an evaluation unit. The measurement beam, directed in the direction of the stroke of the clamping-rod head, or roughly in that direction, runs between the clamping-rod head (9) and a site on the work spindle fixed with respect to the frame; its length is compared in the evaluation unit with a length value which can be entered or preprogrammed, and if these two values agree, the start-up release signal is generated.

Description

ARBEITSSPINDEL FÜR EINE WERKZEUGMASCHINEWORK SPINDLE FOR A MACHINE TOOL
TECHNISCHES GEBIETTECHNICAL AREA
Die Erfindung bezieht sich auf eine Arbeitsspindel für eine Werkzeugmaschine mit einer eine Spannstange aufweisenden Spannvorrichtung für Werkzeuge mit Hohlschaftkegel sowie mit einer die Spannlage des Spannstangenkopfes erfassenden Sensoreinrichtung der im Gattungsbegriff des Patentanspruchs 1 näher bezeichneten Art.The invention relates to a work spindle for a machine tool with a clamping device having a clamping device for tools with hollow shaft taper and with a sensor device detecting the clamping position of the clamping rod head of the type specified in the preamble of claim 1.
Solche Arbeitsspindeln werden bei modernen Werkzeugmaschinen mit sehr hohen Drehzahlen betrieben, die in der Größen- Ordnung von 20 000 min _1 liegen. Hierbei ist es erforderlich, den Anlauf der Arbeitsspindel erst dann freizugeben, wenn das jeweils aufgenommene Werkzeug exakt seine vorbestimmte Spannlage erreicht hat. Das Werkzeug muß dazu mit seinem Anschlagbund an dem zugeordneten Anschlag der Spann- Vorrichtung der Werkzeugaufnahme anliegen, was durch Anziehen des Werkzeuges über die in dessen Hohlschaftkegel eingreifenden Spannelemente geschieht, auf welche mittels der Spannstange und der die Spannstange beaufschlagenden Spannfedern eine entsprechende Zugkraft ausgeübt wird. In der Spannlage gibt der Ausstoßzylinder den Spannstangenkopf frei, und man kann aus der axialen Lage des freigegebenen Spannstangenkopfes ermitteln, ob das von der Spannvorrichtung gehaltene Werkzeug seine ordnungsgemäße Spannposition eingenommen hat. Ist dies nicht der Fall, darf wegen der damit möglichen Unwuchten der Anlauf der Arbeitsspindel nicht erfolgen. STAND DER TECHNIKSuch work spindles are operated in modern machine tools with very high speeds, which lie in the size order of 20 000 min _1. In this case, it is necessary to only release the start-up of the work spindle when the tool picked up in each case has exactly reached its predetermined clamping position. For this purpose, the tool must rest with its stop collar on the associated stop of the clamping device of the tool holder, which is done by tightening the tool via the clamping elements engaging in its hollow shaft cone, to which a corresponding tensile force is exerted by means of the clamping rod and the clamping springs acting on the clamping rod. In the clamping position, the ejection cylinder releases the clamping rod head, and it can be determined from the axial position of the released clamping rod head whether the tool held by the clamping device has assumed its correct clamping position. If this is not the case, the work spindle must not start up due to the possible unbalance. STATE OF THE ART
Bei vertikal angeordneten Arbeitsspindeln geht es darum, die obere Endlage des Spannstangenkopfes möglichst exakt zu erfassen, wozu in bekannter Ausführung gattungsbildender Arbeitsspindeln sogenannte Initiatoren eingesetzt werden. Es handelt sich hierbei um induktive Näherungsschalter die in radialer Richtung zur Spannstange auf der Höhe des Spannstangenkopfes angeordnet sind. Bei erster Inbetrieb- nähme der Arbeitsspindel müssen diese Initiatoren sehr exakt justiert werden, weil allein schon die Hysterese der induktiven Näherungsschalter Ungenauigkeiten bedingt. Nach einiger Betriebszeit setzt sich die gesamte Spannvorrichtung einer Arbeitsspindel, was in der Regel dazu führt, daß der Spannstangenkopf bei ordnungsgemäßem gespanntem Werkzeug weiter nach oben fährt. Für die einmal fest justierten Initiatoren ist dies ein Fehlerzustand, woraufhin trotz ordnungsgemäß gespanntem Werkzeug die Freigabe des Spindelanlaufs nicht erfolgt. Man kann deshalb die gesamte Werk- zeugmaschine erst dann wieder in Betrieb nehmen, nachdem die Initiatoren neu einjustiert worden sind.In the case of vertically arranged work spindles, the aim is to detect the upper end position of the tension rod head as precisely as possible, for which so-called initiators are used in a known design of generic work spindles. These are inductive proximity switches which are arranged in the radial direction of the tension rod at the height of the tension rod head. When the work spindle is started up for the first time, these initiators must be adjusted very precisely because the hysteresis of the inductive proximity switches alone causes inaccuracies. After some operating time, the entire clamping device of a work spindle settles, which usually leads to the clamping rod head moving upwards when the tool is properly clamped. This is an error condition for the initiators, once they are firmly adjusted, whereupon the spindle start is not released despite the properly clamped tool. The entire machine tool can therefore only be put into operation again after the initiators have been readjusted.
DIE ERFINDUNGTHE INVENTION
Der Erfindung liegt nun die Aufgabe zugrunde, eine Arbeitsspindel der gattungsgemäßen Art zu schaffen, bei der mittels der Sensoreinrichtung die axiale Position des Spannstangenkopfes in der Spannlage bezogen auf einen Festpunkt an der Arbeitsspindel gemessen und aus dem Meßwertsignal unter Berücksichtigung von Änderungseinflüssen das Freigabesignal für den Spindelanlauf gebildet wird. Diese Aufgabe wird bei einer Arbeitsspindel der gattungsbildenden Art nach der Erfindung durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst.The object of the invention is to create a work spindle of the generic type in which the sensor device measures the axial position of the tension rod head in the clamping position in relation to a fixed point on the work spindle and from the measured value signal taking into account the influence of changes, the release signal for the spindle start is formed. This object is achieved in a work spindle of the generic type according to the invention by the characterizing features of claim 1.
Für die Erfindung ist wesentlich, daß der Meßstrahl, der entweder koaxial, achsparallel oder schräg zur Spindelachse mit einer dazu parallelen Richtungskomponente ausgerichtet ist einen exakten Meßwert für den Abstand zwischen dem gestellfesten Ort an der Arbeitsspindel und dem Spannstangen- köpf in dessen Spannlage liefert, der in der Auswerteinheit mit einem Referenzwert verglichen werden kann. Ändert sich der über den Meßstrahl ermittelte Längenmeßwert und ist hierbei nach wie vor in der Spannlage der Spannstange das betreffende Werkzeug ordnungsgemäß eingespannt, dann kann hieran der in der Auswerteinheit abgespeicherte Referenzwert leicht angepaßt werden. Es ist sogar möglich, mit zunehmender Betriebsdauer systembedingte Positionsänderungen des Spannstangenkopfes in der Spannlage vorab zu bestimmen und entsprechende Referenzwerte in der Auswerteinheit zu programmieren, so daß sich daran die Sensoreinrichtung selbstätig anpaßt. So können dadurch hervorgerufene Stillstände der Werkzeugmaschine weitestgehend unterbunden oder sogar völlig vermieden werden.It is essential for the invention that the measuring beam, which is aligned either coaxially, axially parallel or obliquely to the spindle axis with a directional component parallel thereto, provides an exact measured value for the distance between the fixed location on the working spindle and the clamping rod head in its clamping position, the can be compared with a reference value in the evaluation unit. If the measured length value determined via the measuring beam changes and the tool concerned is still properly clamped in the clamping position of the clamping rod, then the reference value stored in the evaluation unit can be easily adapted to this. It is even possible to determine system-related changes in the position of the tension rod head in the tensioning position in advance with increasing operating time and to program corresponding reference values in the evaluation unit so that the sensor device adapts itself to this. As a result, machine tool downtimes can be largely prevented or even completely avoided.
Vorteilhafte Ausgestaltungsmerkmale der Erfindung ergeben sich aus den Unteransprüchen.Advantageous design features of the invention result from the subclaims.
KURZBESCHREIBUNG DER ZEICHNUNGSABBILDUNGBRIEF DESCRIPTION OF THE DRAWING ILLUSTRATION
Die Erfindung wird nachfolgend anhand der Zeichnung an einem Ausführungsbeispiel noch näher erläutert. Die Zeichnung zeigt einen schematischen Längsschnitt durch eine Arbeitsspindel für eine Werkzeugmaschine.The invention is explained in more detail below with reference to the drawing using an exemplary embodiment. The drawing shows a schematic longitudinal section through a work spindle for a machine tool.
BESTER WEG ZUR AUSFÜHRUNG DER ERFINDUNGBEST WAY TO CARRY OUT THE INVENTION
Im einzelnen erkennt man am Unterende der Arbeitsspindel eine Werkzeugaufnahme 1, die mit einer Spannvorrichtung ausgestattet ist, um Werkzeuge 2, die einen radialen Anschlagbund 3 und einen Hohlschaftkegel 5 haben, aufnehmen zu können. In ordnungsgemäßer Spannlage liegt das Werkzeug 2 mit seinem Anschlagbund 3 an einem Anschlag 4, wie einer unteren Anschlagfläche der Werkzeugaufnahme 1 an, womit die axiale Lage des Hohlschaftkegels 5 in einem entsprechenden Hohlkegel 16 der Werkzeugaufnahme 1 vorgegeben ist.In detail, a tool holder 1 can be seen at the lower end of the work spindle, which is equipped with a clamping device in order to be able to hold tools 2 which have a radial stop collar 3 and a hollow shaft taper 5. In the correct clamping position, the tool 2 rests with its stop collar 3 against a stop 4, such as a lower stop surface of the tool holder 1, whereby the axial position of the hollow shaft taper 5 in a corresponding hollow taper 16 of the tool holder 1 is predetermined.
In der Spannlage greifen in den Hohlschaft 5 des Werkzeugs 1 Spannelemente 6 ein, die eine Zugkraft auf das Werkzeug 2 ausüben, um es in sicherer Anlage seines Anschlagbundes 3 am Anschlag 4 der Werkzeugaufnahme 1 zu halten. Die Spann- elemente 6 sind zur Freigabe des Werkzeugs 2 mit ihren Eingriffsenden im wesentlichen in radialer Richtung nach innen hin beweglich, entsprechend ist die nach außen gespreizte Lage der Spannelemente 6 deren Spannlage.In the clamping position, clamping elements 6 engage the hollow shaft 5 of the tool 1 and exert a tensile force on the tool 2 in order to hold it securely in its stop collar 3 on the stop 4 of the tool holder 1. To release the tool 2, the clamping elements 6 are essentially movable inwards in the radial direction with their engaging ends. The outwardly spread position of the clamping elements 6 is accordingly their clamping position.
Die für das Spannen des jeweiligen Werkzeugs 2 notwendige axiale Zugkraft wird auf die Spannelemente 6 von einer Spannstange 7 übertragen, die koaxial durch die Arbeitsspindel hindurchgeführt ist. Die Spannstange 7 wird von koaxial umgebenden Federn 8 beaufschlagt, die derart an der Spannstange 7 angreifen, daß diese bei vertikaler Ausrichtung der Arbeitsspindel nach oben hin gedrückt wird. Zur Freigabe des Werkzeugs 2 muß in umgekehrter Richtung die Spannstange 7 zur Werkzeugaufnahme 1 hin nach unten verschoben werden, und dazu dient ein Ausstoßzylinder 10, der koaxial mit der Spannstange 7 oberhalb dieser angeordnet ist und einen am Oberende der Spannstange 7 ausgebildeten Spannstangenkopf 9 beaufschlagt.The axial tensile force required for clamping the respective tool 2 is transmitted to the clamping elements 6 by a clamping rod 7 which is guided coaxially through the work spindle. The tension rod 7 is acted upon by coaxially surrounding springs 8 which act on the tension rod 7 in such a way that the latter is pressed upwards when the work spindle is oriented vertically. To release the tool 2 in the opposite direction Clamping rod 7 can be moved down to the tool holder 1, and an ejection cylinder 10 is used, which is arranged coaxially with the clamping rod 7 above it and acts on a clamping rod head 9 formed at the upper end of the clamping rod 7.
In der Spannlage, in der das Werkzeug 2 ordnungsgemäß in der Werkzeugaufnahme 1 gespannt ist, nimmt der Spannstangenkopf 9 eine obere Endlage ein, die als Referenz für die Freigabe des Anlaufs der Arbeitsspindel genommen wird. Dazu wird der Abstand des Spindelkopfes 9 von einem gestellfesten Ort an der Arbeitsspindel gemessen und mit einem vorgegebenen Längenwert verglichen.In the clamping position, in which the tool 2 is properly clamped in the tool holder 1, the clamping rod head 9 assumes an upper end position, which is taken as a reference for releasing the start of the work spindle. For this purpose, the distance of the spindle head 9 from a fixed location on the work spindle is measured and compared with a predetermined length value.
Dazu dient eine Sensoreinrichtung 11, die oberhalb des Ausstoßzylinders 10 angeordnet ist. Die Sensoreinrichtung 11 weist einen optischen Sender 12 und einen optischen Empfänger 13 auf, wobei der Sender 12 einen optischen Meßstrahl 14 erzeugt, der nach unten hin koaxial durch den Ausstoßzy- linder 10 hindurchtritt. Dazu hat der Ausstoßzylinder 10 eine axial durchgehende Bohrung 15, die am Unterende des Ausstoßzylinders 10 zu dem Spannstangenkopf 9 hin öffnet. Der optische Meßstrahl 14 trifft somit auf den Spannstangenkopf 9 auf und wird von diesem reflektiert, so daß der zurückgeworfene Teil des Meßstrahls 14 auf den Empfänger 13 der Sensoreinheit 11 trifft.A sensor device 11, which is arranged above the ejection cylinder 10, serves this purpose. The sensor device 11 has an optical transmitter 12 and an optical receiver 13, the transmitter 12 generating an optical measuring beam 14, which passes coaxially downward through the ejection cylinder 10. For this purpose, the ejection cylinder 10 has an axially continuous bore 15 which opens at the lower end of the ejection cylinder 10 towards the tension rod head 9. The optical measuring beam 14 thus strikes the tension rod head 9 and is reflected by it, so that the reflected part of the measuring beam 14 strikes the receiver 13 of the sensor unit 11.
In einer in der Zeichnung nicht dargestellten Auswerteinheit kann die Länge des Meßstrahls zwischen der Sensorein- richtung 11 und dem Spannstangenkopf 9 ermittelt werden, wozu unterschiedliche Methoden hinreichend bekannt sind. Entscheidend ist, daß eine Änderung der axialen Position des Spannstangenkopfes 9 weiter von der Werkzeugaufnahme 1 weg sicher erfaßt wird, die durch ein Setzen der gesamten Spannvorrichtung bedingt ist und keinen Einfluß auf eine ordnungsgemäße Spannlage des Werkzeugs 2 hat. So kann man den in der Auswerteinheit über den Meßstrahl ermittelten Längenwert mit einem Referenzwert vergleichen, der je nach axialen Positionsänderungen des Spannstangenkopfes 9 neu vorgegeben oder sogleich unterschiedlich einprogrammiert wird, um bei Übereinstimmung des vom Meßstrahl gelieferten Längenwertes und des Referenzwertes das Anlauffreigabesig- nal für die Arbeitsspindel zu erzeugen. The length of the measuring beam between the sensor device 11 and the tension rod head 9 can be determined in an evaluation unit, not shown in the drawing, for which different methods are sufficiently known. It is crucial that a change in the axial position of the tension rod head 9 is reliably detected further away from the tool holder 1, which is due to the entire clamping device being set and has no influence on a correct clamping position of the tool 2. In this way, the length value determined in the evaluation unit via the measuring beam can be compared with a reference value which, depending on the axial position changes of the tension rod head 9, is newly specified or immediately programmed differently in order to match the start-up release signal for if the length value supplied by the measuring beam and the reference value match Generate work spindle.

Claims

PATENTANSPRÜCHE PATENT CLAIMS
1. Arbeitsspindel für eine Werkzeugmaschine mit einer Spannvorrichtung für Werkzeuge (2) mit Hohlschaftkegel (5) sowie einem Anschlagbund (3) zur Anlage in der Spannlage an einem Anschlag (4) der Spannvorrichtung, die mittels einer koaxial durch die Arbeitsspindel hindurchgeführten Spannstange (7) gegen die Kraft von Spannfedern (8) aus einer gespreizten, in den Hohlschaft (5) des betreffenden Werkzeugs (2) eingreifenden Spannlage unter Freigabe des Werkzeugs (2) einschwenkbare Spannelemente (6) hat, wobei oberhalb des Spannstangenkopfes (9) ein diesen bei Werkzeugfreigabe beaufschlagender Ausstoßzylinder (10) angeordnet und ferner eine die Lage des Spannstangenkopfes (9) in dessen Spannlage erfassende Sensoreinrichtung (11) zur Erzeugung eines Signals für die Freigabe des Anlaufs der Arbeitsspindel vorhanden ist, dadurch gekennzeichnet, daß die Sensoreinrichtung (11) aus einem Sender (12) sowie einem Empfänger (13) für einen in einer Auswerteinheit längenmäßig bestimmbaren Meßstrahl (14) besteht, der in Hubrichtung oder zumindest mit einer Richtungskomponente in Hubrichtung des Spannstangenkopfes (9) ausgerichtet ist und sich zwischen dem Spannstangenkopf (9) oder einem damit festen Teil und einem an der Arbeitsspindel gestellfesten Ort erstreckt, und daß die Länge des Meßstrahls (14) in der Auswerteinheit mit einem unterschiedlich eingebbaren oder vorprogrammierten Längenwert verglichen und bei Übereinstimmung das Anlauffreigabe-Signal erzeugt wird. 1.Working spindle for a machine tool with a clamping device for tools (2) with a hollow shaft taper (5) and a stop collar (3) for bearing in the clamping position on a stop (4) of the clamping device, which is guided by means of a clamping rod (7 ) against the force of tension springs (8) from a spread, in the hollow shaft (5) of the tool (2) engaging clamping position with release of the tool (2) has pivotable clamping elements (6), above the tension rod head (9) When the tool is released, ejection cylinder (10) is arranged and there is also a sensor device (11) detecting the position of the tension rod head (9) in its clamping position for generating a signal for releasing the start of the work spindle, characterized in that the sensor device (11) is off a transmitter (12) and a receiver (13) for a lengthwise determinable in an evaluation unit Measuring beam (14) exists, which is aligned in the stroke direction or at least with a directional component in the stroke direction of the tension rod head (9) and extends between the tension rod head (9) or a part fixed therewith and a location fixed to the work spindle, and that the length of the Measuring beam (14) is compared in the evaluation unit with a differently entered or preprogrammed length value and, if they match, the start-up enable signal is generated.
2. Arbeitsspindel nach Anspruch 1, dadurch gekennzeichnet, daß der Sender (12) und der Empfänger (13) der Sensoreinrichtung (11) in einer gestellfest mit der Ar- beitsspindel angeordneten, baulichen Einheit zusammengefaßt sind und der Spannstangenkopf (9) oder das damit feste Teil als Reflektor für den Meßstrahl (14) ausgebildet ist.2. Working spindle according to Claim 1, characterized in that the transmitter (12) and the receiver (13) of the sensor device (11) are combined in a structural unit arranged fixed to the frame with the working spindle, and the tension rod head (9) or so fixed part is designed as a reflector for the measuring beam (14).
3. Arbeitsspindel nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Sender (12) der Sensoreinrichtung (11) einen optischen Meßstrahl (14) erzeugt und der Empfänger (13) als optischer Empfänger ausgebildet ist.3. Working spindle according to claim 1 or 2, characterized in that the transmitter (12) of the sensor device (11) generates an optical measuring beam (14) and the receiver (13) is designed as an optical receiver.
4. Arbeitsspindel nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Ausstoßzylinder (10) in seinem zentralen Bereich durchgehend hohl ausgebildet ist und der Sender (12) so- wie der Empfänger (13) der Sensoreinrichtung (11) oberhalb des Ausstoßzylinders (10) so angeordnet sind, daß der Meßstrahl (14) im wesentlichen koaxial durch den Ausstoßzylinder (10) hindurchtritt. 4. Working spindle according to one of claims 1 to 3, characterized in that the ejection cylinder (10) is hollow throughout in its central region and the transmitter (12) and the receiver (13) of the sensor device (11) above the ejection cylinder (10) are arranged so that the measuring beam (14) passes substantially coaxially through the ejection cylinder (10).
PCT/EP1997/003659 1996-07-25 1997-07-10 Work spindle for a machine tool WO1998004377A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97936635A EP0876237A2 (en) 1996-07-25 1997-07-10 Work spindle for a machine tool

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996129991 DE19629991A1 (en) 1996-07-25 1996-07-25 Working spindle for a machine tool
DE19629991.8 1996-07-25

Publications (2)

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WO1998004377A2 true WO1998004377A2 (en) 1998-02-05
WO1998004377A3 WO1998004377A3 (en) 1998-03-26

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EP (1) EP0876237A2 (en)
DE (1) DE19629991A1 (en)
WO (1) WO1998004377A2 (en)

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DE502007001543D1 (en) 2007-05-15 2009-10-29 Hueller Hille Gmbh Motorized working spindle for a machine tool
CH705129B1 (en) * 2011-06-17 2015-06-30 Mario Baldaccini Meccanica Di Prec E Device and process for the electro-spindle in the tool change with the said device.
DE102013107791B4 (en) * 2013-07-22 2017-05-04 Chiron-Werke Gmbh & Co. Kg machine tool
DE102016108407A1 (en) * 2016-05-06 2017-11-09 Ott-Jakob Spanntechnik Gmbh Release device for a tool or workpiece clamp
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EP0221802A1 (en) * 1985-10-14 1987-05-13 AEROSPATIALE Société Nationale Industrielle Safety tool holder for a machine tool

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Publication number Priority date Publication date Assignee Title
CN111886100A (en) * 2019-02-27 2020-11-03 萨卡多机电学有限公司 Electric spindle

Also Published As

Publication number Publication date
DE19629991A1 (en) 1998-01-29
WO1998004377A3 (en) 1998-03-26
EP0876237A2 (en) 1998-11-11

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