EP0481220B1 - Clamping chuck - Google Patents

Clamping chuck Download PDF

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Publication number
EP0481220B1
EP0481220B1 EP91115623A EP91115623A EP0481220B1 EP 0481220 B1 EP0481220 B1 EP 0481220B1 EP 91115623 A EP91115623 A EP 91115623A EP 91115623 A EP91115623 A EP 91115623A EP 0481220 B1 EP0481220 B1 EP 0481220B1
Authority
EP
European Patent Office
Prior art keywords
clamping chuck
clamping
locking element
chuck
chuck 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.)
Expired - Lifetime
Application number
EP91115623A
Other languages
German (de)
French (fr)
Other versions
EP0481220A2 (en
EP0481220A3 (en
Inventor
Peter Baumgärtner
Karl Wieland
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0481220A2 publication Critical patent/EP0481220A2/en
Publication of EP0481220A3 publication Critical patent/EP0481220A3/en
Application granted granted Critical
Publication of EP0481220B1 publication Critical patent/EP0481220B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/16—Longitudinal screw clamp
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/17—Socket type
    • Y10T279/17111—Fluid-conduit drill holding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/94—Tool-support
    • Y10T408/95—Tool-support with tool-retaining means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/30952—Milling with cutter holder

Definitions

  • the invention relates to a chuck according to the preamble of claim 1 and is primarily intended for use with tools that have at least one so-called driving surface or recess on their cylindrical shank according to the corresponding standard.
  • collet chucks previously known for this tool group or the so-called sleeve chucks with a clamping screw acting radially on the tool shank are relative to the head part or free end of the diameter there due to the arrangement of the radial clamping elements kept thick, so that in many cases it is difficult or impossible to get to the points to be machined on the respective workpiece.
  • the object of the present invention is therefore also to create a new type of chuck for commercially available tools of the type in question, which can be kept at its free end comprising the tool shank, as long as desired and extremely small in diameter.
  • the chuck front part itself is free of radially acting clamping elements and thus only needs to be so strong in its diameter or wall thickness that there is sufficient material strength to accommodate the workers acting on the tool.
  • cutting tools 1 such as milling cutters, drills, countersinks and the like.
  • recessed driving surface 1b with inclined stop collars 1c or the like lying in the axial direction is, as already mentioned above, distinguished from the known prior art above all by its general structure from the fact that the clamping force "P" acting on the tool shaft 1a extends in the axial direction and is transmitted by a locking member 2 or 2a between the tool shaft 1a and the chuck front part 3a, thereby producing axially and radially acting clamping forces.
  • the chuck is therefore in the form of an elongated sleeve 3, 3a with a central longitudinal bore 1d, clamping screw 4 inserted at one end therein and in the chuck front part 3a channel 3b accessible from the outside for inserting the locking member 2 or 2a.
  • the channel 3b receiving the locking member 2 or 2a in the chuck front part 3a runs obliquely from its outer surface in the direction of the free, slightly tapered end 3c of the front part 3a and in accordance with the design of the Locking member as a ball 2, polygon 2a or the like. Is also correspondingly profiled in its cross section.
  • the training as an angular part in the possibly angular channel is particularly advantageous for larger tools and at higher working pressures; A corresponding part 2a can be seen from FIG. 2, the parallel contact of the rear side 2a 'on the stop collar 1c of the driving surface 1b being particularly advantageous for the angular locking member 2a.

Abstract

A chuck (3, 3a), especially for chucking cutting tools (1) such as milling cutters, drills, counterboring bits and the like with a cylindrical shank (1a) and a recessed driving surface (1b) located on this shank (1a) and having stop collars (1c) or the like lying in the axial direction, is designed in such a way that the chucking force (P) acting on the tool shank (1a) runs in the axial direction and is transmitted by a locking member (2) between the tool shank (1a) and the front part (3a) of the chuck. <IMAGE>

Description

Die Erfindung bezieht sich auf ein Spannfutter nach dem Oberbegriff des Patentanspruches 1 und ist vornehmlich bestimmt für die Verwendung bei Werkzeugen, die gemäß entsprechender Norm auf ihrem zylindrischen Schaft mindestens eine sogenannte Mitnahmefläche oder Aussparung haben.The invention relates to a chuck according to the preamble of claim 1 and is primarily intended for use with tools that have at least one so-called driving surface or recess on their cylindrical shank according to the corresponding standard.

Die bislang für diese Werkzeuggruppe bekannten Zangenspannfutter oder die sogenannten Hülsenspannfutter mit radial auf den Werkzeugschaft wirkender Klemmschraube, z.B. nach der FR-A 2 644 089, sind, bedingt durch die Anordnung der Radialspannelemente, an ihrem Kopfteil bzw. freien Ende vom dortigen Durchmesser her relativ dick gehalten, so daß man in vielen Fällen nur schwer oder gar nicht an die am jeweiligen Werkstück zu bearbeitenden Stellen herankommt.The collet chucks previously known for this tool group or the so-called sleeve chucks with a clamping screw acting radially on the tool shank, for example according to FR-A 2 644 089, are relative to the head part or free end of the diameter there due to the arrangement of the radial clamping elements kept thick, so that in many cases it is difficult or impossible to get to the points to be machined on the respective workpiece.

Die Aufgabe der vorliegenden Erfindung besteht deshalb auch darin, für handelsübliche Werkzeuge der hier zur Rede stehenden Art ein neuartiges Spannfutter zu schaffen, das an seinem freien, den Werkzeugschaft umfassenden, Ende beliebig lang und vom Durchmesser her extrem klein gehalten werden kann.The object of the present invention is therefore also to create a new type of chuck for commercially available tools of the type in question, which can be kept at its free end comprising the tool shank, as long as desired and extremely small in diameter.

Gelöst wird diese Aufgabe mit einem Spannfutter mit den Merkmalen von Anspruch 1 in genereller neuer Art und Weise, wobei die auf den Werkzeugschaft einwirkende Einspannkraft weitestgehend in axialer Richtung verläuft und durch ein Sperrglied zwischen Werkzeugschaft und Spannfuttervorderteil übertragen wird und dadurch axial und radial wirkende Spannkräfte erzeugt werden.This object is achieved with a chuck with the features of claim 1 in a generally new way, the clamping force acting on the tool shank largely extending in the axial direction and being transmitted by a locking member between the tool shank and the chuck front part and thereby generating axially and radially acting clamping forces become.

Hierdurch ist das Spannfuttervorderteil selbst frei von radial wirkenden Spannelementen und braucht somit in seinem Durchmesser bzw. seiner Wandstärke nur so stark ausgebildet zu werden, daß genügend Materialfestigkeit zur Aufnahme der auf das Werkzeug wirkenden Arbeitskräfte vorhanden ist.As a result, the chuck front part itself is free of radially acting clamping elements and thus only needs to be so strong in its diameter or wall thickness that there is sufficient material strength to accommodate the workers acting on the tool.

Die hierbei speziellen baulichen Merkmale eines Ausführungsbeispiels der Erfindung sind in den Unteransprüchen gegeben, in der Zeichnung in zwei alternativen Ausführungsbeispielen dargestellt und anhand dieser Darstellungen im folgenden noch näher erläutert. Es zeigen:

Fig. 1
ein erfindungsgemäß ausgeführtes Spannfutter im Längsschnitt
und
Fig. 2
eine Alternative zu Fig. 1.
The special structural features of an embodiment of the invention are given in the subclaims, shown in the drawing in two alternative embodiments and based on these representations in the following explained. Show it:
Fig. 1
an inventive chuck in longitudinal section
and
Fig. 2
an alternative to FIG. 1.

Das dargestellte Spannfutter 3, 3a zum Spannen von vornehmlich spanabhebenden Werkzeugen 1 wie Fräser, Bohrer, Senker u. dgl. mit zylindrischem Schaft 1a und auf diesem befindlicher, vertieft angeordneter Mitnahmefläche 1b mit in axialer Richtung liegenden, geneigten Anschlagbunden 1c o. dgl., zeichnet sich, wie bereits zuvor erwähnt, gegegenüber dem bekannten Stand der Technik vor allem dadurch in seinem generellen Aufbau aus, daß die auf den Werkzeugschaft 1a einwirkende Einspannkraft "P" in axialer Richtung verläuft und durch ein Sperrglied 2 bzw. 2a zwischen Werkzeugschaft 1a und Spannfuttervorderteil 3a übertragen wird und dadurch axial und radial wirkende Spannkräfte erzeugt werden.
In baulicher Ausgestaltung ist deshalb das Spannfutter in Form einer langgestreckten Hülse 3, 3a mit zentrisch durchlaufender Längsbohrung 1d, darin einendig eingesetzter Spannschraube 4 sowie im Spannfuttervorderteil 3a von außen zugänglichem Kanal 3b zum Einsetzen des Sperrgliedes 2 bzw. 2a ausgebildet.The chuck 3, 3a shown for clamping primarily cutting tools 1 such as milling cutters, drills, countersinks and the like. Like. With cylindrical shaft 1a and on it, recessed driving surface 1b with inclined stop collars 1c or the like lying in the axial direction, is, as already mentioned above, distinguished from the known prior art above all by its general structure from the fact that the clamping force "P" acting on the tool shaft 1a extends in the axial direction and is transmitted by a locking member 2 or 2a between the tool shaft 1a and the chuck front part 3a, thereby producing axially and radially acting clamping forces.
In a structural configuration, the chuck is therefore in the form of an elongated sleeve 3, 3a with a central longitudinal bore 1d, clamping screw 4 inserted at one end therein and in the chuck front part 3a channel 3b accessible from the outside for inserting the locking member 2 or 2a.

Eine vorteilhafte Ausführungsvariante des letzteren ist dabei vor allem dadurch gegeben, daß der das Sperrglied 2 bzw. 2a aufnehmende Kanal 3b im Spannfuttervorderteil 3a von dessen Außenfläche her schräg in Richtung auf das freie, leicht verjüngte Ende 3c des Vorderteils 3a verläuft und entsprechend der Gestaltung des Sperrgliedes als Kugel 2, Vielkant 2a o. dgl. in seinem Querschnitt ebenfalls entsprechend profiliert ist. Die Ausbildung als kantiges Teil im ggf. kantigen Kanal ist dabei insbesondere für größere Werkzeuge und bei höheren Arbeitsdrücken von Vorteil; aus Fig. 2 ist ein entsprechender Teil 2a ersichtlich, wobei bei dem kantigen Sperrglied 2a noch von besonderem Vorteil die parallele Anlage der Rückseite 2a' am dortigen Anschlagbund 1c der Mitnahmefläche 1b ist.An advantageous embodiment of the latter is given above all by the fact that the channel 3b receiving the locking member 2 or 2a in the chuck front part 3a runs obliquely from its outer surface in the direction of the free, slightly tapered end 3c of the front part 3a and in accordance with the design of the Locking member as a ball 2, polygon 2a or the like. Is also correspondingly profiled in its cross section. The training as an angular part in the possibly angular channel is particularly advantageous for larger tools and at higher working pressures; A corresponding part 2a can be seen from FIG. 2, the parallel contact of the rear side 2a 'on the stop collar 1c of the driving surface 1b being particularly advantageous for the angular locking member 2a.

Bei dieser neuen Ausgestaltung dient zur Übertragung der Einspannkraft "P" von der Spannschraube 4 über

  • die ursprünglichen Beschreibungsseiten 5 und 6 schließen unverändert an -
den Werkzeugschaft 1a zum Sperrglied 2 bzw. 2a ein Druckstück 5 in Form eines losen, zylinderischen Zwischengliedes, welches samt Spannschraube 4, 4b und Werkzeugschaft 1a zum Zwecke der Kühlmittelzuführung rohrförmig ausgebildet bzw. mit einer Innenbohrung 6 versehen sein kann.In this new embodiment, the clamping force "P" is transmitted from the clamping screw 4 via
  • the original description pages 5 and 6 continue unchanged -
the tool shaft 1a to the locking member 2 or 2a, a pressure piece 5 in the form of a loose, cylindrical intermediate member, which together with the clamping screw 4, 4b and tool shaft 1a can be tubular for the purpose of supplying coolant or can be provided with an inner bore 6.

Diese zuvor beschriebene neue Art des Spannens ermöglicht nunmehr erstmals eine Bauform, bei der das Spannfuttervorderteil 3a in seinem Durchmesser "d" wesentlich kleiner als derjenige "D" der Spannfutterhülse 3 sowie je nach Einsatzzweck beliebig lang "L" gehalten bzw. ausgebildet werden kann, ohne daß dabei Schwingungen o. dgl. am Werkzeug auftreten, da das verspannte, stangen- oder rohrförmige Druckstück 5 stabilisierend auf die gesamte Spannfutterhülse 3 wirkt.This previously described new type of clamping now makes it possible for the first time to have a design in which the chuck front part 3a, in its diameter “d”, is significantly smaller than that “D” of the chuck sleeve 3 and, depending on the intended use, can be kept or formed as long as desired “L”, without vibrations or the like occurring on the tool, since the clamped, rod-shaped or tubular pressure piece 5 has a stabilizing effect on the entire chuck sleeve 3.

Weitere Vorteile dieser neuen Ausbildung nach den Fig. 1 und 2 sind u. a.:

  • a. Das Spannfutter erlaubt durch seine schlanke Bauweise den Einsatz von Normalwerkzeugen, wo sonst überlange und damit teure Sonderwerkzeuge eingesetzt werden müßten.
  • b. Ebenso können auch Vollhartmetallwerkzeuge für die Bearbeitung von tiefliegenden und randnahen Bohrungen mit hervorragenden Stückzeiten eingesetzt werden, was ebenfalls beachtliche Einsparungen ergibt, da die Anschaffung von teuren Sonderwerkzeugen entfällt.
  • c. Das Spannsystem ist für alle Werkzeuge mit einer sogenannten Spannfläche oder ähnlichem geeignet.
  • d. Die kombinierte Spannung stabilisiert das Werkzeug und ermöglicht zudem eine innere Kühlmittelzufuhr.
Other advantages of this new design according to FIGS. 1 and 2 include:
  • a. Due to its slim design, the chuck allows the use of normal tools, where otherwise long and therefore expensive special tools would have to be used.
  • b. Solid carbide tools can also be used to machine deep and near-edge bores with excellent piece times, which also results in considerable savings, since there is no need to purchase expensive special tools.
  • c. The clamping system is suitable for all tools with a so-called clamping surface or the like.
  • d. The combined clamping stabilizes the tool and also enables an internal coolant supply.

BezugsziffernverzeichnisReference number index

11
WerkzeugTool
1a1a
WerkzeugschaftTool shank
1b1b
MitnahmeflächeTake-away area
1c1c
AnschlagbundStop collar
1d1d
LängsbohrungLongitudinal bore
22nd
SperrgliedLocking member
2a2a
Sperrglied ( Fig. 2 )Locking member (Fig. 2)
2a'2a '
Rückseiteback
33rd
Spannfutter(-hülse)Chuck (sleeve)
3a3a
VorderteilFront part
3b3b
Kanalchannel
3c3c
freies Endefree end
44th
SpannschraubeClamping screw
4a4a
KopfstückHeadpiece
4b4b
InnensechskantHexagon socket
55
DruckstückPressure piece
66
InnenbohrungInner bore
PP
EinspannkraftClamping force
LL
Hülsenvorderteil-LängeSleeve front length
dd
Hülsenvorderteil-DurchmesserSleeve front part diameter
DD
Spannfutter-DorchmesserChuck dagger knife

Claims (6)

  1. Clamping chuck (3, 3a) with a central receiving bore (1d) for cutting tools (1), which comprise a cylindrical shank (1a) with entraining surface (1b), which is disposed thereon, arranged recessed and bounded in axial direction by inclined stop collars (1c), and with at least one releasable locking element (2) acting on this entraining surface (1b), characterised by an elongate sleeve (3, 3a) with a receiving bore (1d) running through centrally, a clamping screw (4) inserted therein at one end as well as, in the front part (3a) of the clamping chuck, an externally accessible channel (3b) for insertion of the locking element (2).
  2. Clamping chuck according to claim 1, characterised by a presser member (5) as loose intermediate element between the clamping screw (4) and tool shank (1a).
  3. Clamping chuck according to claim 1 or 2, characterised thereby that the clamping screw (4), presser member (5) and tool shank (1a) are constructed to be tubular, or provided with an internal bore (6), for the purpose of supply of coolant.
  4. Clamping chuck according to at least one of the preceding claims, characterised thereby that the channel, which receives the locking element (2 or 2a), in the clamping chuck forward part (3a) extends from the outer surface thereof at an inclination in direction towards the free end (3c) of the same (3a) and in correspondence with the design of the locking element as a ball (2), polyhedron (2a) or the like is likewise correspondingly profiled in its cross-section.
  5. Clamping chuck according to claim 4, characterised by plane-parallel contact of the plane surface rear side (2a') of the locking element (2a) at the adjacent stop collar (1c) of the entraining surface (1b).
  6. Clamping chuck according to one of the preceding claims, characterised thereby that the clamping chuck forward part (3a) is smaller in its diameter (d) than that (D) of the clamping chuck sleeve (3) as well as is as long (length L) as desired according to respective purpose of use.
EP91115623A 1990-10-15 1991-09-14 Clamping chuck Expired - Lifetime EP0481220B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4032694A DE4032694C2 (en) 1990-10-15 1990-10-15 CHUCK
DE4032694 1990-10-15

Publications (3)

Publication Number Publication Date
EP0481220A2 EP0481220A2 (en) 1992-04-22
EP0481220A3 EP0481220A3 (en) 1992-07-15
EP0481220B1 true EP0481220B1 (en) 1995-01-11

Family

ID=6416327

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91115623A Expired - Lifetime EP0481220B1 (en) 1990-10-15 1991-09-14 Clamping chuck

Country Status (7)

Country Link
US (1) US5152541A (en)
EP (1) EP0481220B1 (en)
JP (1) JPH04261704A (en)
AT (1) ATE116885T1 (en)
DE (3) DE4032694C2 (en)
DK (1) DK0481220T3 (en)
ES (1) ES2069157T3 (en)

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US6347914B1 (en) * 2000-03-09 2002-02-19 Black & Decker Inc. Rotary tool holder
DE102004021082A1 (en) * 2004-04-29 2005-11-17 Bilz Werkzeugfabrik Gmbh & Co. Kg Quick-change insert for tools, especially for taps
DE102006062973C5 (en) * 2006-04-10 2020-03-05 Franz Haimer Maschinenbau Kg System of tool holder with a cylindrical tool holder in the form of a collet chuck and tool
DE202011109498U1 (en) 2011-12-27 2012-02-13 Franz Haimer Maschinenbau Kg Tool holder and clamping system with such a tool holder
IN2012CH04699A (en) * 2012-11-09 2015-06-19 Kumar Mada Vijay
US8672592B2 (en) * 2012-05-16 2014-03-18 Iscar, Ltd. Milling collet having pull-out preventer for retaining a fluted milling tool
EP2857127B1 (en) * 2013-10-02 2016-03-16 Eugen Fahrion GmbH & Co. KG Tool holder with a collet chuck for clamping a tool
DE102018133474A1 (en) * 2018-12-21 2020-06-25 Albrecht Präzision GmbH & Co. KG Collet and collet chuck

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Also Published As

Publication number Publication date
JPH04261704A (en) 1992-09-17
US5152541A (en) 1992-10-06
DE4032694C2 (en) 1993-11-04
EP0481220A2 (en) 1992-04-22
ATE116885T1 (en) 1995-01-15
DE9103580U1 (en) 1991-06-27
DK0481220T3 (en) 1995-06-06
ES2069157T3 (en) 1995-05-01
DE4032694A1 (en) 1992-04-16
DE59104230D1 (en) 1995-02-23
EP0481220A3 (en) 1992-07-15

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