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EP1722911A1 - Tete a serrage - Google Patents

Tete a serrage

Info

Publication number
EP1722911A1
EP1722911A1 EP05728239A EP05728239A EP1722911A1 EP 1722911 A1 EP1722911 A1 EP 1722911A1 EP 05728239 A EP05728239 A EP 05728239A EP 05728239 A EP05728239 A EP 05728239A EP 1722911 A1 EP1722911 A1 EP 1722911A1
Authority
EP
European Patent Office
Prior art keywords
collet
clamping head
head according
rolling
segment
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Withdrawn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
EP05728239A
Other languages
German (de)
English (en)
Inventor
Walter Grossmann
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.)
Index Werke GmbH and Co KG Hahn and Tessky
Original Assignee
Index Werke GmbH and Co KG Hahn and Tessky
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 Index Werke GmbH and Co KG Hahn and Tessky filed Critical Index Werke GmbH and Co KG Hahn and Tessky
Publication of EP1722911A1 publication Critical patent/EP1722911A1/fr
Withdrawn legal-status Critical Current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
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
    • B23B31/20—Longitudinally-split sleeves, e.g. collet chucks
    • B23B31/201—Characterized by features relating primarily to remote control of the gripping means
    • B23B31/207—Characterized by features relating primarily to remote control of the gripping means using mechanical transmission through the spindle
    • B23B31/2073—Axially fixed cam, moving jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2260/00—Details of constructional elements
    • B23B2260/022—Balls

Definitions

  • the invention relates to a clamping head for workpieces or tools, comprising a collet holder and collet segments of a collet arranged on and guided through the collet holder and having clamping surfaces for clamping the respective workpiece or tool.
  • the collet segments on the collet carrier are usually guided by conical surfaces, which, however, only allow a flat contact in a single position when the collet segments are displaced relative to the collet carrier, in other positions there is either a double linear or a simple linear system.
  • the invention is therefore based on the object of improving a clamping head of the generic type in such a way that a variable setting and adjustment of the clamping forces exerted by the collet segments is possible.
  • This object is achieved according to the invention in a chuck of the type described in the introduction in that each collet segment is supported on the collet carrier by at least one defined frictional relationship in all relative positions of the collet segment relative to the collet carrier creating support element.
  • the collet segment introduces only a part of its radial opposing supporting forces via the at least one supporting element into the collet holder.
  • the respective collet element introduces supporting forces opposite radial clamping forces exclusively into the collet holder via the at least one supporting element.
  • a particularly expedient embodiment of the solution according to the invention provides, however, that the support element forms a rotational entrainment between the collet holder and the respective collet segment when it rotates about the collet axis.
  • the support element is arranged in a rotationally fixed manner relative to the collet holder with respect to a rotation about the collet axis.
  • a favorable solution provides that the support element is arranged in a rotationally fixed manner on the respective collet segment with respect to a rotation about the collet axis.
  • a particularly advantageous embodiment of the support element according to the invention provides that it comprises rolling elements which can be moved in a rolling manner on at least one rolling surface, so that at least between the rolling elements and the rolling surface there is only rolling or rolling friction, but no more sliding friction or static friction, which occurs when the collet segment is adjusted must be overcome.
  • the rolling surface preferably runs at an acute angle to the collet axis.
  • the rolling elements are expediently mounted in a rolling element receptacle in order to prevent the rolling elements from loosening when the collet is changed.
  • the rolling element holder is arranged either on the collet holder or the respective collet segment.
  • the rolling surface is arranged on the collet segment or the collet carrier.
  • the rolling surface is arranged in a recess, so that rotational rotation can take place via the rolling element receptacle and the arrangement of the rolling surface in the recess.
  • the rolling element receptacle has a rolling surface.
  • the rolling elements in the rolling element receptacle can thus be moved essentially without sliding friction by rolling on their rolling surface.
  • the rolling elements in the rolling element receptacle are held in a starting position by a resilient element, wherein the respective collet segment rests against the respective collet segment in its starting position in the starting position and when moving In the direction of the clamping position, the rolling elements in the rolling element receptacle then move against the force of the resilient element and roll on the opposite rolling surfaces.
  • the rolling elements lie one behind the other in the rolling element receptacle, that is to say are arranged in direct contact with one another.
  • the rolling element receptacle is a sliding receptacle that supports the rolling element by means of sliding friction.
  • Such a slide mount could either be arranged directly in the collet holder or in the respective collet segment.
  • a further advantageous solution provides that the rolling elements are arranged in a guide body which is encompassed by the support element.
  • Such a guide body offers the possibility of using this to achieve the rotational entrainment between the collet holder and the respective collet segment.
  • the guide body is arranged on the collet holder in a rotationally fixed manner with respect to rotation about the collet axis.
  • the guide body is arranged in a rotationally fixed manner on the respective collet segment with respect to rotation about the collet axis.
  • Such a sliding body is guided by sliding friction, but the fact that it has a defined sliding surface has the advantage that this surface is the same size in all relative positions of the collet segment relative to the collet carrier, so that defined frictional relationships are present which are easier Have it designed in the sense of reduced friction.
  • the sliding body has a sliding surface which can be moved on a slideway.
  • the sliding body is provided with lubricant pockets.
  • These lubricant pockets can be arranged on an outside of the sliding body.
  • the lubricant pockets are arranged to penetrate into the sliding body, starting from the sliding surface. Furthermore, in order to achieve constant lubrication of the sliding surface, it is particularly advantageous if the lubricant pockets are open on the radially outer side of the sliding surface with respect to the collet axis. This has the great advantage that the centrifugal force can be used with the rotating clamping head to convey the lubricant from the lubricant pockets to the sliding surface.
  • the sliding body is arranged on the clamping head according to the invention, it is particularly advantageous if the sliding body is arranged on the collet segment and the slideway on the collet carrier.
  • the slideway extends at an acute angle to the collet axis.
  • a further advantageous embodiment of a clamping head according to the invention provides that the support element comprises at least one tilting body which is articulated on the one hand on the collet holder and on the other hand on the respective collet segment.
  • the tilting bodies are each arranged with end regions in these supporting receptacles.
  • the tilting bodies In the context of the exemplary embodiment with tilting bodies, it is expedient to arrange the tilting bodies in such a way that they move radially from the starting position to the clamping position on the axis of the collet when the respective collet segment moves.
  • Figure 1 shows a longitudinal section through a first embodiment of a clamping head according to the invention.
  • Figure 2 is a plan view of the first embodiment in the direction of arrow A in Fig. 1.
  • Fig. 3 is a section along line 3-3 in Fig. 1;
  • FIG. 4 shows an enlarged, fragmentary illustration of the clamping head corresponding to FIG. 1 in the region of the rolling elements effective between a collet segment and the collet holder;
  • FIG. 5 shows a section similar to FIG. 1 through a second embodiment of a clamping head according to the invention
  • Fig. 6 is a section along line 6-6 in Fig. 5;
  • FIG. 7 shows a section similar to FIG. 1 through a third embodiment of a clamping head according to the invention
  • Fig. 8 is a section along line 8-8 in Fig. 5;
  • Fig. 9 is a section along line 9-9 in Fig. 8;
  • FIG. 10 shows a section similar to FIG. 1 through a fourth embodiment of a clamping head according to the invention
  • Fig. 11 is a section along line 11-11 in Fig. 10;
  • FIG. 12 shows a section along line 12-12 in FIG. 11; 13 shows a half-sided section along line 1-1 through a fifth embodiment of a clamping head according to the invention in the clamping position of the collet segment shown;
  • a first exemplary embodiment of a clamping head designated as a whole by 10 in FIG. 1, is held on a spindle head 12 of a spindle 14 of a machine tool, which can be driven to rotate about a spindle axis 16.
  • the spindle 14 comprises a spindle tube 18 carrying the spindle head 12, in which a tensioning tube 20 for actuating the tensioning head 10 is movably guided in a direction of displacement 22 parallel to the spindle axis 16.
  • the clamping head 10 is in turn formed by a clamping head housing 30 which is mounted directly on the spindle head 12 and which in turn comprises a collet holder 32.
  • the collet holder 32 is part of the clamping head housing 30 and thus together with the clamping head housing 30 with the spindle 14 about the spindle axis 16.
  • the collet holder 32 encloses a collet designated as a whole as 34, which, as shown in FIG. 2, comprises, for example, three collet segments 36a, 36b and 36c, that are arranged around a collet axis 38 coinciding with the spindle axis 16 in the circumferential direction 40 with spaces 42 between successive collet segments 36, in which spaces 42 resilient intermediate pieces 44 are seated, which bear against the collet segments 36.
  • Each of the collet segments 36a to 36c in turn comprises a clamping surface 46a to 46c facing the collet axis 38, with which a workpiece or tool that can be inserted into the collet 34 can be clamped in that the respective collet segment 36a to 36c in a radial direction 48a to 48c to the collet axis 38 can be moved in order to clamp the workpiece or tool circumferentially with the clamping surfaces 46a to 46c.
  • each of the collet segments 36a to 36c is provided with a support surface 50, which in this case extends at an acute angle to the collet axis 38.
  • each of the collet segments 36 is supported on a row 52 of rolling elements 60 which acts as a supporting element and, in the first exemplary embodiment, is formed from the individual rolling elements 60 lying one behind the other in a longitudinal direction 54, the longitudinal direction 54 being at the same angle to the collet axis 38 runs like the support surface 50.
  • the rolling bodies 60 with their contact surfaces 62 supporting the support surface 50, form a guide for the support surface 50, which parallel the respective collet segment 36 with respect to the collet axis 38 positions aligned to each other, wherein the clamping surfaces 46 can be positioned at different radial distances from the collet 38 due to the acute angle between the collet axis 38 and the support surface 50.
  • the rolling elements 60 are guided in the first embodiment in a recess 64 in the collet holder 32, the bore 64 being machined parallel to the longitudinal direction in the collet holder 32, but in such a way that the recess 64 is not completely in the collet holder 32, but one parallel to it Has longitudinal direction 54 opening 66 through which the rolling elements 60 protrude with a portion 68.
  • the partial region 68 is a spherical cap which has a smaller extent than a hemisphere, so that the rolling elements 60 designed as balls are guided in the recess 64 over more than half of their circumference and thus in each case center points 70 of the rolling bodies 60 designed as balls lie on a side of the opening 66 facing away from the partial region 68 within the recess 64.
  • the recess 64 is designed in such a way that the rolling bodies 60 designed as balls are preferably, as shown in FIGS. 1 and 4, supported with contact surfaces 72 on a base 74 of the recess 64 opposite the opening 66, which is also parallel to the longitudinal direction 54 and thus also runs parallel to the support surface 50. Furthermore, the rolling elements 60a to 60d are enclosed in the recess 64, specifically by means of an inner end plate 76 arranged on the collet holder 32 and an outer end plate 78, a compression spring 80 also being supported on the inner end plate, which compresses the rolling elements 60a to 60d moves towards the outer end plate 78 and holds in a starting position.
  • the collet segments 36 rest with their supporting surfaces 50 on the contact surfaces 62 of the rolling elements 60a to 60d in the form of balls when the collet segments 36 are in their open starting position.
  • the collet segments 36 are pulled. moved by means of the tensioning tube 20 in the direction of the spindle head 12, the pressure of the support surfaces 50 on the contact surfaces 62 of the rolling elements and the pressure of the contact surfaces 72 of the rolling elements 60a to 60d on the bottom 74 of the bore 64 lead to the rolling elements 60a to 60d rolling on the one hand on the base 74 as a rolling surface and on the other hand on the supporting surface 50 of the collet segments 36 as an opposite rolling surface, the rolling elements 60a to 60d migrating away from the outer end plate 78 in the direction of the inner end plate 76.
  • the collet segments 36 can be moved with their clamping surfaces 46 into a clamping position, the
  • the compression spring 80 is compressed when the rolling elements 60 move in the direction of the inner end plate 76.
  • a tensile or releasing force is preferably applied to the collet segments 36a to 36c via a collet adapter 82, which engages in a circumferential groove 84 of the collet segments facing it with a nose 86 and, on the other hand, is connected to the collet tube 20.
  • the support surface 50 is designed as the bottom of a groove 88 which is rounded in cross section and into which the Rolling elements 60 engage with their partial area 68, which projects beyond the opening 66, so that through the recess 64 and the groove 88 via the rolling elements 60, a rotational entrainment between the collet holder 32 and the collet segments 36 with respect to a rotation about the collet axis 38 and is thus created around the spindle axis 16.
  • the collet segments 36 are aligned relative to the collet carrier 32 by lateral guide surfaces 90 of the collet carrier 32 lying on both sides of the opening 66, against which the collet segments 36 with alignment surfaces 92 rest.
  • the outer end plate 78 is also provided with a seal 94 which bears completely against an outer contour of the collet segments 36 and also engages in the support surfaces designed as depressions.
  • FIGS. 5 and 6 In a second exemplary embodiment of a clamping head according to the invention, shown in FIGS. 5 and 6, those elements which are identical to those of the first exemplary embodiment are provided with the same reference numerals, so that with regard to their description, reference is made in full to the statements relating to the first exemplary embodiment can.
  • the rolling bodies 60 ' are not designed as balls, but rather as rollers which are arranged in a recess 64' in the collet holder 32.
  • rollers 60 'in the recess 64' they are provided with lateral pins 102 which project coaxially to the axis 70 'of the rolling elements 60' designed as rollers and which are formed in one of the recess 64 ' undercut 104 adjoining opening 66 are guided.
  • the rolling elements 60 'designed as rollers also project over a recess 68' with a partial region 68 'and engage with this partial region 68' in a groove 88 'in the respective collet segment 36 which forms the support surface 50' and in this case is rectangular in cross section a, so that in this case as well, the rolling elements 60 'designed as rollers represent a rotary drive for the collet segments 36 when the collet holder 32 rotates about the collet axis 38.
  • the collet segments 36 carry guide bodies 110 which are fixed to the collet segments 36, for example in that they sit in a groove 112 in the collet segments 36 and are secured by a pin 114. are slidably held in the groove 112.
  • These guide bodies 110 engage in a recess 64 ′′ corresponding to their shape, the guide bodies 110 being supported on the base 74 ′′ of the recess 64 ′′ via rolling bodies 60 ′′.
  • the rolling elements 60 are designed such that they move in a rolling manner on the base 74" as a rolling surface.
  • the rolling elements 60 "in the guide body 110 with a partial area 122 in the case of balls as rolling elements 60" with a spherical cap area, are mounted in sliding mounts 124, so that the rolling elements 60 "in the sliding mounts 124 rotate under sliding friction can, but no rolling or rolling friction occurs between the rolling elements 60 ′′ and the guide body 110.
  • the rolling elements 60 ", as shown in FIG. 9, are preferably arranged in a two-dimensional pattern which extends on the one hand in the longitudinal direction 54, but on the other hand also transversely thereto, for example in three adjacent rows 52" a, 52 "b and 52 "c of rolling elements 60".
  • the collet segments 36 are thus supported with respect to the collet carrier 32 on the one hand via sliding friction between the rolling elements 60 "and the guide body 110, and on the other hand via rolling or rolling friction between the rolling elements 60" and the base 74 ", so that compared to the known solutions there is also reduced friction.
  • the third exemplary embodiment is designed in the same way as the first and second exemplary embodiments, so that the same reference numerals are used with regard to the individual features and, in addition, full reference is made to the statements relating to the preceding exemplary embodiments.
  • a sliding surface 130 of the guide body 110 ′′ lying flat on the base 74 ′′ is provided with pockets 132 extending in the longitudinal direction 54 and transversely thereto, into which lubricant, in particular grease, is introduced, which rotates around the spindle axis 16 Spindle 14 is carried out due to the centrifugal forces and constantly forms a lubricating film between the sliding surface 130 and the bottom 74 "of the recess 64" acting as a slideway, so that there is also a support with reduced friction between the collet segments 36 and the collet carrier 32.
  • the fourth exemplary embodiment is designed in the same way as the preceding exemplary embodiments, so that reference is made in full to the statements relating to these exemplary embodiments.
  • tilting elements 140, 142 are provided between the collet holder 32 and the collet segments 36 as support bodies, which are mounted on the one hand with end regions 144 and 146 in tilt receptacles 148 and 150 in the collet holder 32 and on the other hand with End regions 154 and 156 are mounted in tilt receptacles 158 and 160 in the respective collet segment 36.
  • the tilting elements 140 and 142 with their extension in a height direction 162 lying between the end regions 144 and 154 and 146 and 156, act as a leg of a parallelogram, the height direction running between the end regions 144 and 154 and 146 and 156 being at a different angle to the collet axis 38 , depending on how the collet segment 36 is displaced in the displacement direction 22 relative to the collet carrier 32.
  • the tilting receptacles 150 and 152 and 148 and 150 as well as 158 and 160 each lie in geometric planes 164 and 166, which preferably run parallel to one another and at an acute angle to the collet axis 38, namely in the longitudinal direction 54, which are also at the same acute angle the geometric planes 164 and 166, one behind the other.
  • the tilt receptacles 148 and 150 and 158 and 160 are limited in the direction of the geometric planes 164 and 166 transversely to the longitudinal direction 54, so that the tilting elements 140 and 142 transversely to the longitudinal direction 54 in the tilt receptacles 148 and 150 and 158 and 160 transversely to the longitudinal direction 54 are guided to a limited extent and are therefore also effective for transmitting a rotary movement from the collet holder 32 to the individual collet segments 36.
  • tilting elements 140 and 142 act on the basis of the defined one

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machine Tool Units (AREA)

Abstract

L'objectif de l'invention est d'améliorer une tête à serrage pour des pièces ou des outils, comprenant un support de pince de serrage et des segments de pinces de serrage d'une pince de serrage, disposés sur le support et dirigés par celui-ci, lesdits segments présentant des surfaces de serrage destinées à serrer la pièce ou l'outil correspondants, ceci permettant de déplacer ou d'ajuster les forces de serrage exercées par les segments des pinces de serrage. A cet effet, chaque segment de pince de serrage est supporté sur le support pour pinces de serrage par un élément de support créant des relations de frottement définies dans toutes les positions relatives du segments de pinces de serrage par rapport au support des pinces de serrage.
EP05728239A 2004-03-05 2005-03-03 Tete a serrage Withdrawn EP1722911A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004011727A DE102004011727A1 (de) 2004-03-05 2004-03-05 Spannkopf
PCT/EP2005/002218 WO2005084858A1 (fr) 2004-03-05 2005-03-03 Tete a serrage

Publications (1)

Publication Number Publication Date
EP1722911A1 true EP1722911A1 (fr) 2006-11-22

Family

ID=34877566

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05728239A Withdrawn EP1722911A1 (fr) 2004-03-05 2005-03-03 Tete a serrage

Country Status (3)

Country Link
EP (1) EP1722911A1 (fr)
DE (1) DE102004011727A1 (fr)
WO (1) WO2005084858A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1952923A1 (fr) * 2007-02-01 2008-08-06 MARIO PINTO S.p.A. Mandrin à pince pour machines-outils
DE102007038789A1 (de) * 2007-08-07 2009-02-12 Hainbuch Gmbh Spannende Technik Spannvorrichtung und Anordnung einer solchen Spannvorrichtung mit einer Spannzange
DE102013201071B3 (de) * 2013-01-23 2014-05-28 Hainbuch Gmbh Spannende Technik Spanneinrichtung
DE202015008601U1 (de) * 2015-12-15 2016-01-28 Horst Knäbel Spannvorrichtung für Werkstücke
DE102021121569A1 (de) * 2021-08-19 2023-02-23 Bilz Werkzeugfabrik Gmbh & Co. Kg Vorrichtung und Verfahren zum Spannen und Entspannen von Werkzeugen in einer Spannzange

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2545610A (en) * 1949-10-14 1951-03-20 Hardinge Brothers Inc Actuating mechanism for collets and the like
US3521896A (en) * 1968-05-28 1970-07-28 Masakazu Matsumoto Chuck
US4682920A (en) * 1986-03-26 1987-07-28 United Aircraft Products, Inc. Rotating air bearing
DE4209175A1 (de) * 1992-03-20 1993-09-23 Imt Ingenieurgemeinschaft Fuer Spannfutter
DE19853525A1 (de) * 1998-11-20 2000-05-25 Dieter Schlichting Zange zum Halten von Stangenmaterial in Drehmaschinen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005084858A1 *

Also Published As

Publication number Publication date
WO2005084858A1 (fr) 2005-09-15
DE102004011727A1 (de) 2005-09-22

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