DE202015008601U1 - Clamping device for workpieces - Google Patents

Clamping device for workpieces

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Publication number
DE202015008601U1
DE202015008601U1 DE202015008601.2U DE202015008601U DE202015008601U1 DE 202015008601 U1 DE202015008601 U1 DE 202015008601U1 DE 202015008601 U DE202015008601 U DE 202015008601U DE 202015008601 U1 DE202015008601 U1 DE 202015008601U1
Authority
DE
Germany
Prior art keywords
element
ball cage
characterized
device according
tensioning
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
DE202015008601.2U
Other languages
German (de)
Original Assignee
Horst Knäbel
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 Horst Knäbel filed Critical Horst Knäbel
Priority to DE202015008601.2U priority Critical patent/DE202015008601U1/en
Publication of DE202015008601U1 publication Critical patent/DE202015008601U1/en
Application status is Expired - Lifetime legal-status Critical
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B31/00Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02Chucks
    • B23B31/10Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/12Chucks with simultaneously-acting jaws, whether or not also individually adjustable
    • B23B31/20Longitudinally-split sleeves, e.g. collet chucks
    • B23B31/201Longitudinally-split sleeves, e.g. collet chucks characterised by features relating primarily to remote control of the gripping means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23BTURNING; BORING
    • B23B31/00Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/40Expansion mandrels
    • B23B31/4006Gripping the work or tool by a split sleeve

Abstract

Device for excitingly receiving a workpiece to be machined and / or measured, rotating concentrically about the rotation axis of a machine, consisting of a clamping element having a conical annular surface, a support element with an identically conical surface and an axially displacing one another in the axial direction Tensioning element, wherein the tensioning element has at least one slit extending in the axial direction, characterized in that on the conical surface (4a) of the tensioning element (4) a ball-shaped ball cage (in the same way conical and with a plurality of balls (6) of the same diameter (FIG. 7) is applied and the clamping element (4) via the balls (6) with the cone having the same surface (5a) of the support element (5) is non-positively connected.

Description

  • The invention relates to a device for exciting recording of a machined and / or to be measured, concentrically about the rotation axis of a machine rotating workpiece consisting of a conical annular surface having clamping element, a support member having an identical conical surface and one the two Parts in the axial direction to each other displacing clamping member, wherein the clamping element has at least one slot extending in the axial direction.
  • To accommodate workpieces that have a central opening and must be very accurately processed and / or checked after their processing, so-called mandrels are known, which consist of a support member and a workpiece receiving clamping element. In this case, the support element has a conical surface and the clamping element is provided with an identical, conical surface. Furthermore, the clamping element has at least one slot extending in the axial direction. By means of a tensioning element, the tensioning element can now be displaced axially relative to the support element. Due to the conicity, this leads to a change in the diameter of the clamping element and thus to a clamping of the workpiece located on the clamping element. The support member may be formed either like a spine or a sleeve, so that a workpiece can be clamped either from the outside or from the inside.
  • In these known clamping devices, it is considered disadvantageous that during the axial displacement of the clamping element on or in the support element, a very high sliding friction is created, which leads to a high wear of these elements and thus to immediacy impairment of concentricity and on the other hand, especially with a small cone angle, to overcome the static friction when relaxing the workpiece requires very expensive measures.
  • The present invention is therefore based on the object to improve the known clamping device to the effect that in a simple, inexpensive and inventive device, the frictional forces are greatly reduced to minimize wear as much as possible to grant a high concentricity even in the long term and thus a highly accurate to create a practical clamping device with a much longer service life.
  • To solve this problem is proposed according to the invention in a device of the type described above, that on the conical surface of the clamping element in the same way conical and equipped with a plurality of balls of the same diameter ringfederähnlicher ball cage is applied and that the clamping element on the balls with the surface of the support element having the same cone is non-positively connected.
  • This configuration of the device ensures that the clamping element, in particular at small cone angles, almost frictionless and exactly concentric move on the support member and away from him, that the wear, the running accuracy and the life of a high-quality, commercial linear ball guide corresponds and that can be sealed by the design and arrangement of the ball cage, the slot of the clamping element and its end faces in a meaningful way.
  • Further features of such a device are disclosed in claims 2 to 10.
  • The invention and further advantages thereof are explained in more detail below with reference to embodiments shown in a drawing. Show
  • 1 a longitudinal section through a clamping device for receiving workpieces with a bore according to the invention,
  • 2 a parallel to the axis, but offset by 90 ° longitudinal cut by the clamping device accordingly 1 .
  • 3 a perspective view of a longitudinally slotted ball cage,
  • 4 a longitudinal section through a clamping device for receiving workpieces with a clamping pin or cylindrical projection according to the invention,
  • 5 a parallel to the axis, but offset by 90 ° longitudinal section through the clamping device accordingly 4 ,
  • The in the 1 and 2 the drawing to see clamping device 1 consists of a trained as a mandrel support element 5 that has a conical outer surface 5a has. In this case, the cone has a cone angle of 1 ° to 8 °, in the present case of 6 °. The thicker end of the support element 5 is in the illustrated embodiment in one piece with a connecting part designed as a flange 9 manufactured, over which the support element 5 be flanged to a correspondingly formed part, for example the spindle of a lathe can. In the connection part 9 For example, there are four radial tapped holes 9a incorporated, the known screws 10 be able to record. About these screws 10 can the connection part 9 and thus the mandrel-like support element 5 be aligned exactly with the axis of rotation of the machine.
  • On the conical surface 5a of the support element 5 is one with a slot 7b provided, ring spring-like ball cage 7 according to the 3 attached, which has a conical, a truncated cone corresponding shape with a cone angle of 6 °. The ball cage 7 can consist of a metallic material as well as of suitable plastic, such as Teflon. In this ball cage 7 are a variety of openings 7d provided in several circumferential rows over the entire surface of the ball cage 7 are arranged mirror-inverted arranged aligned with each other and each one made as a precision ball ball 6 made of hardened steel, carbide or ceramic. These balls 6 For example, have a diameter of 1.0 to 4.0 mm and are preferably with grease in the openings 7d of the ball cage 7 used.
  • The distance between the individual openings 7d or the balls 6 should be as low as possible to reduce the tension on the largest possible number of balls 6 to distribute and thus keep the surface pressure low despite high clamping force. The number of openings 7d and therefore the number of balls 6 is always of the clamping diameter of the clamping device 1 depends and is in the illustrated embodiment at about 120. The trained as a slotted ring spring-like sleeve ball cage 7 is dimensioned so that it is with a corresponding bias to the conical surface 4a one with a slot 4b provided clamping element 4 invests. Along the slot 4b and in the opposite area are in the ball cage 7 no openings 7d or balls 6 to provide for a diametrical arrangement of the slots 4b . 7b of the clamping element 4 and the ball cage 7 a sufficiently large cover of the slot 4b of the clamping element 4 to ensure and so one of the bias and the nature, in particular the roughness of both surfaces 4a . 7a to achieve appropriate radial seal.
  • While the 1 the diametrical arrangement of the slots 4b . 7b of the clamping element 4 and the ball cage 7 illustrates that shows 2 the axial arrangement of the balls 6 and an axial stop 12a for a aufzunehmendes, but not shown here workpiece. The 1 and 2 further show that the clamping element 4 and the ball cage 7 advantageous to have the same length and together as a disc 3a trained tendon 3 axially on the conically increasing outer diameter of the support element 5 can be pushed. At the opposite end face of the clamping element 4 and the ball cage 7 there is a rubber-elastic spring washer 11 , For example, Vulkollan, on the one hand on an end face of the connecting part 9 and on the other hand on the end faces of the clamping element 4 and the ball cage 7 supports and so takes over the axial sealing.
  • The tensioning device 1 of the embodiment according to the 4 and 5 corresponds essentially to the embodiment of the 1 and 2 , Accordingly, the identical parts are provided with the same reference numerals. In the 4 and 5 is only the support element 5 formed as a sleeve with a tapered bore, which is the ball cage 7 and the tensioning element 4 encloses. This device is used to hold workpieces that are to be fixed via a pin or a cylindrical approach. One notable difference is that the tendon 3a is designed as a threaded ring, the front side both on the clamping element 4 as well as on the ball cage 7 against the existing here rubber-elastic spring washer 11 suppressed. The rubber-elastic spring washer 11 This is about a with the support element 5 connected disc 12 supported, which can also be used as a stop for the workpiece to be clamped if necessary.
  • In order to avoid a dimensional over-determination, it is advantageous between the ball cage 7 and the support element 5 allow a gap of about 0.1 to 0.5 mm. In order to seal this gap to the outside, is in devices according to the 3 and 4 the use of a seal 14 , For example, an O-ring, between the threaded ring 3b and the support element 5 proposed. Such a seal can be used in devices according to the 1 and 2 omitted, since the tendon 3a closes the free space sufficiently tight.
  • In all cases, during the clamping process on the tendon 3a the slotted clamping element 4 from the balls 6 carried on the support element 5 moved and over the cone of the support element 5 a concentric change in the diameter of the clamping element 4 achieved and thus fixes the workpiece. The ball cage 7 ensures that the largest possible number of balls 6 optimally positioned and the slot 4b of the clamping element 4 is sealed radially and axially in a meaningful way.
  • By the formation of the slot 4b in the clamping element 4 and the related embodiment of the cage 7 It is possible not only to clamp workpieces with cylindrical bore or cylindrical pin or approach exactly, but also to fix in the same way profiled hubs and profiled pin exactly when the clamping element 4 identifies a corresponding counter profile. Another special feature is the profile-centered tensioning of a spline by means of a clamping element 4 whose slot 4b spiraling. Such a clamping element 4 applies during clamping in the same way on both sides of the flanks of the profile.
  • To the advantage of such, inventive clamping device 1 To be able to fully utilize, the smallest possible clamping range should be selected for a very precise and concentric fixation of the workpiece. So it is possible to get along with very small cone angles of 1 to 6 °. At a cone angle of, for example, 3 ° is achieved by an axial feed of the tendon 3a of about 1 mm achieves a clamping range of about 50 μm, which corresponds approximately to the tolerance range of a 200 mm H7 bore. The achievable radial clamping force is at an axial feed force of about 100 N at least nearly 2000 N.
  • LIST OF REFERENCE NUMBERS
  • 1
    jig
    2
    the rotation axis
    3
    tendon
    3a
    Tensioner as a disc
    3b
    Tensioning element as threaded ring
    4
    clamping element
    4a
    conical surface of the clamping element
    4b
    Slot of the clamping element
    4c
    the slot near the region of the clamping element
    5
    support element
    5a
    conical surface of the support element
    6
    precision balls
    7
    ball cage
    7a
    conical surface of the ball cage
    7b
    Slot of the ball cage
    7c
    the slot near the area of the ball cage
    7d
    Openings in the ball cage
    8th
    sealing element
    9
    connector
    10
    screws
    11
    rubber-elastic spring washer
    12
    disc
    12a
    attack
    14
    poetry

Claims (10)

  1. Device for excitingly receiving a workpiece to be machined and / or measured, rotating concentrically around the rotation axis of a machine, comprising a clamping element having a conical annular surface, a support element with an identically conical surface and an axially displacing one another in the axial direction Tensioning element, wherein the tensioning element has at least one slot extending in the axial direction, characterized in that on the conical surface ( 4a ) of the tensioning element ( 4 ) in the same way conical and with a plurality of balls ( 6 ) of the same diameter populated ring spring-like ball cage ( 7 ) and the tensioning element ( 4 ) over the balls ( 6 ) with the same cone having surface ( 5a ) of the support element ( 5 ) is positively connected.
  2. Device according to claim 1, characterized in that the ball cage ( 7 ) a slot extending in the axial direction ( 7b ) having.
  3. Device according to claim 1 and 2, that the slots ( 4b . 7b ) of the tensioning element ( 4 ) and the ball cage ( 7 ) parallel or oblique to, or spirally along the axis of rotation ( 2 ) are formed.
  4. Device according to claim 1 and 2, characterized in that the balls ( 6 ) - except in the area of slots ( 4b , 7b ) - over the entire circumference of the ball cage ( 7 ) are evenly distributed and arranged in mirror image to each other.
  5. Device according to one of claims 1 to 4, characterized in that the slots ( 4b . 7b ) of the tensioning element ( 4 ) and the ball cage ( 7 ) are arranged at least approximately diametrically opposite one another.
  6. Device according to one of claims 1 to 5, characterized in that the clamping element ( 4 ) together with ball cage ( 7 ) is axially displaceable and that the end face of the clamping element ( 4 ) and / or the end face of the ball cage ( 7 ) a sealing element ( 11 ) or designed as a sealing element tendon ( 3 ) assigned.
  7. Device according to one of claims 1 to 5, characterized in that the tendon ( 3 ) as a screw ( 3a ) or as a threaded ring ( 3b ) is trained.
  8. Device according to one of claims 1 to 6, characterized in that the support element ( 5 ) in one piece with a connecting part which can be flange-mounted to the spindle of a machine ( 9 ) is trained.
  9. Device according to one of claims 1 to 7, characterized in that the connecting part ( 9 ) via adjusting screws ( 10 ) radially to the rotation axis ( 2 ) of the machine is alignable.
  10. Device according to one of claims 1 to 8, characterized in that the cone angle of the support element ( 5 ), the tensioning element ( 3 ) and the ball cage ( 7 ) a tensioning device ( 1 ) always formed exactly the same size and preferably between 0.5 and 6 ° can be selected.
DE202015008601.2U 2015-12-15 2015-12-15 Clamping device for workpieces Expired - Lifetime DE202015008601U1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE202015008601.2U DE202015008601U1 (en) 2015-12-15 2015-12-15 Clamping device for workpieces

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202015008601.2U DE202015008601U1 (en) 2015-12-15 2015-12-15 Clamping device for workpieces
PCT/EP2016/080321 WO2017102558A1 (en) 2015-12-15 2016-12-08 Clamping device for workpieces

Publications (1)

Publication Number Publication Date
DE202015008601U1 true DE202015008601U1 (en) 2016-01-28

Family

ID=55358824

Family Applications (1)

Application Number Title Priority Date Filing Date
DE202015008601.2U Expired - Lifetime DE202015008601U1 (en) 2015-12-15 2015-12-15 Clamping device for workpieces

Country Status (2)

Country Link
DE (1) DE202015008601U1 (en)
WO (1) WO2017102558A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107186653A (en) * 2017-07-31 2017-09-22 中核(天津)科技发展有限公司 A kind of multi-point support intracavity tubular elements positioner and localization method
CN107202562A (en) * 2017-07-31 2017-09-26 中核(天津)科技发展有限公司 A kind of three coordinate measuring machine positioned based on multi-point support intracavity and measuring method
CN107218912A (en) * 2017-07-31 2017-09-29 中核(天津)科技发展有限公司 A kind of three coordinate measuring machine positioned based on expansible support inner chamber formula and measuring method
CN107246856A (en) * 2017-07-31 2017-10-13 中核(天津)科技发展有限公司 A kind of expansible support inner chamber formula tubular elements positioner and localization method
CN108213480A (en) * 2016-12-15 2018-06-29 中国航空工业集团公司济南特种结构研究所 A kind of thin-wall bush processing tool

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB565256A (en) * 1943-06-10 1944-11-02 Fischer Bearings Company Ltd Improvements relating to mandrels for supporting and driving rotating workpieces
US2819906A (en) * 1953-10-21 1958-01-14 Cushman Chuck Co Collet chuck
JPS5924407Y2 (en) * 1975-03-08 1984-07-19
JPH08323517A (en) * 1995-05-26 1996-12-10 Tetsuo Tagami Chucking device for cutting tool
JP3617745B2 (en) * 1996-11-12 2005-02-09 株式会社コスメック Collet clamp
DE102004011727A1 (en) * 2004-03-05 2005-09-22 Index-Werke Gmbh & Co. Kg Hahn & Tessky Clamping head

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108213480A (en) * 2016-12-15 2018-06-29 中国航空工业集团公司济南特种结构研究所 A kind of thin-wall bush processing tool
CN107186653A (en) * 2017-07-31 2017-09-22 中核(天津)科技发展有限公司 A kind of multi-point support intracavity tubular elements positioner and localization method
CN107202562A (en) * 2017-07-31 2017-09-26 中核(天津)科技发展有限公司 A kind of three coordinate measuring machine positioned based on multi-point support intracavity and measuring method
CN107218912A (en) * 2017-07-31 2017-09-29 中核(天津)科技发展有限公司 A kind of three coordinate measuring machine positioned based on expansible support inner chamber formula and measuring method
CN107246856A (en) * 2017-07-31 2017-10-13 中核(天津)科技发展有限公司 A kind of expansible support inner chamber formula tubular elements positioner and localization method

Also Published As

Publication number Publication date
WO2017102558A1 (en) 2017-06-22

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Legal Events

Date Code Title Description
R207 Utility model specification
R082 Change of representative

Representative=s name: KEENWAY PATENTANWAELTE NEUMANN HEINE TARUTTIS , DE

Representative=s name: WAGNER ALBIGER & PARTNER PATENTANWAELTE MBB, DE

Representative=s name: KNH PATENTANWAELTE KAHLHOEFER NEUMANN ROESSLER, DE

Representative=s name: KNH PATENTANWAELTE NEUMANN HEINE TARUTTIS PART, DE

R082 Change of representative

Representative=s name: KEENWAY PATENTANWAELTE NEUMANN HEINE TARUTTIS , DE

Representative=s name: KNH PATENTANWAELTE KAHLHOEFER NEUMANN ROESSLER, DE

Representative=s name: KNH PATENTANWAELTE NEUMANN HEINE TARUTTIS PART, DE

R156 Lapse of ip right after 3 years