EP3520965B1 - Agencement de broche de serrage à effet de traction vers le bas - Google Patents

Agencement de broche de serrage à effet de traction vers le bas Download PDF

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Publication number
EP3520965B1
EP3520965B1 EP19150211.1A EP19150211A EP3520965B1 EP 3520965 B1 EP3520965 B1 EP 3520965B1 EP 19150211 A EP19150211 A EP 19150211A EP 3520965 B1 EP3520965 B1 EP 3520965B1
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EP
European Patent Office
Prior art keywords
mandrel
workpiece
base plate
recess
counter bearing
Prior art date
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EP19150211.1A
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German (de)
English (en)
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EP3520965A1 (fr
Inventor
André Haug
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ICG GmbH and Co KG
Original Assignee
Kipp Verpachtungen EK
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Publication of EP3520965A1 publication Critical patent/EP3520965A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/06—Arrangements for positively actuating jaws
    • B25B5/08—Arrangements for positively actuating jaws using cams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B5/00—Clamps
    • B25B5/14—Clamps for work of special profile

Definitions

  • Such a mandrel arrangement is based on, for example EP 0 785 049 A1 emerged.
  • a mandrel arrangement is from the Company publication "Mandrels Collet Chucks” from Röhm GmbH, 89567 Sontheim / Brenz, DE, dated 09/2017, page 7017 , known.
  • a workpiece can be fastened in particular with a so-called mandrel.
  • the mandrel is inserted axially into a recess in the workpiece relative to the workpiece and spread open radially.
  • the expansion of the mandrel can take place with a wedge-shaped expansion element that is moved in the axial direction in the mandrel, for example by screwing it in.
  • the clamped workpiece typically rests on a counter bearing that is formed on a lower part of the mandrel component.
  • Such a mandrel is for example from the Catalog "Control parts
  • Such mandrels can position a workpiece exactly transversely to the axis of the mandrel.
  • an additional clamping device is usually used which presses the workpiece onto the counter bearing.
  • a mandrel arrangement is known in which a sleeve mandrel is mounted displaceably on a base body via a resilient pressure piece.
  • a clamping cone is arranged in the case mandrel, which has an intermediate piece can be moved axially with respect to the base body. By pulling down the clamping cone, the sleeve mandrel is expanded radially as well as axially drawn towards the base body.
  • a workpiece can also be clamped in the axial direction by pulling it against the base body, so that an additional clamping device is not necessary.
  • Such workpieces are typically brought up to the mandrel for fastening to the mandrel arrangement along the axis of rotation of the workpiece or along the axis of the mandrel and placed on the mandrel, and then the mandrel is expanded. After machining, the mandrel is first released and then the workpiece is lifted and removed along the axis of the mandrel.
  • the known mandrel arrangement can also be used well for this application.
  • a workpiece transport axis along the axis of the mandrel is often not provided, for example for reasons of cost, or would be cumbersome for the process flow within the scope of the intended machining. There may simply be too little space for the workpiece to be lifted off axially, especially when the workpiece is handled manually. However, a workpiece transport axis is then often set up transversely to the axis of the mandrel, or it would be more efficient for the process sequence, for example to carry out further processing on the workpiece with the same axial position but at a different lateral position. For reasons of space, it is often particularly easy to feed the workpiece from the side to set up, again especially for manual workpiece handling. In such applications, however, the mandrel would block the workpiece from moving.
  • the invention is based on the object of presenting a mandrel arrangement which can be used effectively with a workpiece transport transverse to the axis of the mandrel.
  • the mandrel arrangement comprises a base plate on which a front bearing is formed for contact with the workpiece and a rear bearing for contact with the counter bearing; the base plate forms a recess into which the mandrel along the actuation axis all the way behind the front bearing is retractable into the recess, and there is a clamping device by means of which the actuator can be moved along the clamping direction towards the counter bearing and towards the base plate.
  • an indirect contact of the workpiece on the counter bearing is set up, namely via the base plate.
  • the base plate is supported by a rear bearing on the counter bearing and, with the front bearing, provides a system for the workpiece.
  • the base plate forms a recess into which the mandrel can be inserted or retracted.
  • the recess is large enough that the Clamping mandrel (and possibly other parts that protrude axially beyond the clamping mandrel) can be withdrawn completely behind the front bearing or a corresponding front bearing plane, which typically runs perpendicular to the actuation axis / Verspannrichutng.
  • a processing station or measuring station at which the mandrel arrangement is installed can be installed with a reduced space requirement axially above the mandrel (in relation to its position with clamped workpiece) or axially above the workpiece (in relation to its position clamped on the base plate) get along.
  • the invention therefore simplifies workpiece transport transversely to the actuation axis of the mandrel, both for automated (machine) and for manual workpiece handling.
  • the actuator protrudes through the counter bearing and protrudes into the base plate or through the base plate.
  • the clamping device typically engages the actuator and the component of the counter bearing.
  • a preferred embodiment of a mandrel arrangement according to the invention provides that the actuator is designed with a pull rod, and the clamping device pulls the expansion element towards the counter bearing by means of the pull rod when the actuator moves along the tensioning direction, in particular the pull rod through the counter bearing to Jig is guided.
  • This enables a particularly compact and robust structure.
  • more complex force transmissions for example with a push rod and a C-shaped wraparound, can also be considered.
  • the expansion element is automatically pushed back axially against the tensioning direction when the tensioning device is relieved, so that the tensioning mandrel returns to a non-expanded position.
  • the radial tensioning of the workpiece is then relieved very reliably when the clamping device is released; In particular, no access from above (from the side facing away from the counter bearing) through the workpiece to the mandrel is necessary in order to (for example manually) release a friction-related, self-locking radial tensioning of the workpiece.
  • This embodiment is therefore particularly useful when the recess of the workpiece is designed as a blind hole and access to the mandrel from above is therefore not possible.
  • the second elastic element can in particular be designed as a compression spring.
  • a first spring stiffness of the first elastic element is greater than a second spring stiffness of the second elastic element. This ensures that in the course of the tensioning of the tensioning device, that is to say when the actuator is moved along the tensioning direction towards the counter bearing, primarily the radial expansion of the mandrel can take place (and thereby the workpiece is gripped), and then especially (when the workpiece is gripped) the axial pulling down of the workpiece can take place. The workpiece is therefore only pulled down when it is securely gripped, whereby a particularly reliable and defined fastening of the workpiece is achieved. If the expansion of the mandrel requires a noticeable force until it comes into contact with the workpiece, this should be taken into account when designing the spring stiffness and the first spring stiffness of the first elastic element should be selected correspondingly larger.
  • the second elastic element is designed with a helical spring which presses the expansion element away from a base part of the clamping mandrel against the clamping direction.
  • This embodiment is particularly simple and compact.
  • the helical spring is typically completely encompassed by the mandrel.
  • the expansion element is designed with one or more conical surface-shaped surfaces and / or the clamping mandrel forms one or more conical surface-shaped counter-surfaces for the expansion element.
  • Conical jacket-shaped here means that the surface or mating surface describes at least part of the surface of a conical jacket.
  • conical surface-shaped surfaces other types of wedge-shaped surfaces or counter surfaces are also possible, but conical surface-shaped surfaces are usually particularly easy to manufacture and have a particularly low tendency to tilt.
  • mandrel is essentially sleeve-shaped, with at least the expansion element being axially displaceable in the mandrel for spreading the mandrel.
  • the sleeve shape enables functional components to be accommodated in the interior of the mandrel, such as a second elastic element and parts of the actuator, and thus allows a particularly compact design.
  • the mandrel is designed with several expanding jaws, which are separated from one another by gaps that run essentially parallel to the actuation axis.
  • the expanding jaws are typically connected at one axial end to a foot part (on the side of the counter bearing) and can bend up in a substantially radial direction at the opposite axial end (on the side facing away from the counter bearing).
  • This type of mandrel is simple and inexpensive to manufacture.
  • expanding jaws expanding balls are also possible, for example, which are pressed radially outward by a wedge-shaped, in particular conical-jacket-shaped expanding element.
  • An advantageous embodiment provides that the recess of the base plate is designed with a stop which limits axial insertion of the mandrel into the base plate. This facilitates the handling of the mandrel arrangement; the retracted mandrel cannot fall through the base plate and be accidentally lost.
  • the recess of the base plate is continuous, so that the clamping mandrel can be passed completely through the recess of the base plate.
  • the continuous design of the recess relates to the (maximum) radial width of the mandrel, compared to which the recess has a larger (minimum) radial width around the mandrel completely to be able to perform.
  • a clamping assembly formed from the clamping device, the counter bearing, the actuator and the clamping mandrel) can easily be moved on the base plate between various continuous recesses in the base plate, in particular in order to handle a different type of workpiece.
  • the base plate can be made particularly thin in the axial direction and thus cost-effective in a material-saving manner, in particular thinner in the axial direction than the length of the mandrel.
  • the mandrel can be pulled back behind the front bearing in that it is (at least partially) led out of the base plate on the opposite side.
  • the base plate in particular by means of the recess in the base plate, forms a guide for the clamping mandrel.
  • a third elastic element is present, by means of which the counter bearing is pretensioned away from the base plate along the actuation axis with respect to the base plate when the counter bearing and the rear bearing are in contact with one another. This makes it easier to retract a clamp assembly (formed by the entirety of the clamping mandrel, actuator, counter bearing and clamping device) when the clamping device is relaxed, in particular to pull the clamping assembly or the clamping mandrel back behind the front bearing of the base plate.
  • the clamping device is designed with an eccentric lever.
  • An eccentric lever is simple and safe to handle.
  • the clamping device can also be designed with a conical screw, for example.
  • An embodiment is also advantageous in which one or more profiled contact surfaces, in particular serrated contact surfaces, are formed on the clamping mandrel for contact with the wall of the recess in the workpiece.
  • the scope of the present invention also includes the use of a clamping mandrel arrangement according to the invention, described above, which is characterized in that when the clamping mandrel is inserted into the recess of the workpiece with the clamping device, the actuator is moved along the clamping direction so far towards the counter bearing, that the mandrel is clamped expanded in the recess and the workpiece is placed on the base plate and thus indirectly on the counter bearing without play.
  • the fastening of the workpiece to the base plate is robust and precise and easily reproducible both in the axial direction and across it. Accordingly, machining processes and measurements with great accuracy are possible.
  • a variant of this use is preferred, in which, with the workpiece resting on the base plate without play, the workpiece is subjected to a drilling and / or milling process.
  • a backlash-free alignment of the workpiece is particularly important for these operations.
  • the workpiece is held stationary and, in particular, is not rotated.
  • the Fig. 1 shows in a schematic longitudinal section and Fig. 2 in a side view under 90 ° rotation compared to the Fig. 1 a mandrel arrangement 1 according to the invention.
  • the clamping mandrel arrangement 1 comprises a clamping device 2 (here designed with an eccentric lever 3), a counter bearing 4 (here designed on a base element 5 on which the eccentric lever 3 is also mounted), a clamping mandrel 6 that is essentially sleeve-shaped here, an actuator 7 and a base plate 8.
  • the entirety (coherent assembly) of clamping device 2, counter bearing 4, clamping mandrel 6 and actuator 7 is also referred to as the clamping assembly 10.
  • the mandrel arrangement 1 is used to fasten a workpiece 9 on the base plate 8.
  • the base plate 8 is typically locked in place, for example on a machine frame (not shown in detail).
  • the recess 11 acts as a guide for the mandrel 6, see above that it can be moved in the base plate 8 parallel to a bracing direction VR or along an actuation axis BA of the actuator 7.
  • the clamping assembly 10 In the state shown (with the tensioning device 2 relaxed), the clamping assembly 10 is loosely inserted into the recess 11 of the base plate 8, and could easily be pulled downward out of the recess 11 as far as desired. In particular, the clamping assembly 10 could be pulled down so far that the mandrel 6 and also the clamping assembly 10 as a whole can be withdrawn completely behind a front bearing 12 of the base plate 8, which is formed here with a front bearing plane 13; the recess 11 is thus continuous with regard to the mandrel 6 (or its radial width). With complete retraction behind the front bearing 12, a workpiece resting on the front bearing 12 could be moved along the front bearing 12 without barriers (not shown in more detail).
  • clamping assembly 10 could be pulled completely out of the recess 11, in particular in order to move the clamping assembly 10 to another recess of the base plate 8 or to a recess of another base plate (not shown in detail).
  • the first elastic element 14 is supported here on the base element 5 or on the counter bearing 4 and on a foot part 21 of the clamping mandrel 6.
  • a spreading element 15 is formed, which is formed with cone-shaped surfaces 16. These are supported on cone-shaped mating surfaces 17 in the interior of the mandrel 6, namely on the inner sides of expanding jaws 18a, 18b, which are separated from one another by axially extending gaps 19. The lower end of the gaps 19 merge into relief bores 20 in order to prevent cracking when the expanding jaws 18a, 18b are spread apart.
  • the expanding jaws 18a, 18b protrude from the common foot part 21 of the mandrel 6.
  • the actuator 7 With the clamping device 2, the actuator 7 can be moved axially along the actuation axis BA relative to the base element 5 or the counter bearing 4. In the position shown, the actuator 7 and thus also the expansion element 15 are extended relatively far upwards, i.e. away from the counter bearing 4 against the tensioning direction VR, corresponding to a relaxed state of the clamping device 2.
  • the expansion element 15 exerts only a small radial force in the relaxed state via the wedge effect of the cone-shaped surfaces 16 on the expanding mandrel 6, so that the expanding jaws 18a, 18b are only pressed slightly radially outward. In this state, the expanding mandrel 6 can be inserted into or out of a recess 23 of the workpiece 9 without any problems with radial play.
  • the workpiece 9 with its recess 23 is loosely attached to the mandrel 6 in order to prepare the clamping of the workpiece 9 on the base plate 8.
  • the operator grips the clamping assembly 10 and presses it upwards onto the base plate 8.
  • the counter bearing 4 and a rear bearing 24 of the base plate 8 come into mutual contact.
  • the workpiece 9 is up to the Base plate 8 pushed so that a lower workpiece side 25 comes to rest on the front bearing 12 of the base plate 8; as a result, the mandrel 6 protrudes somewhat deeper into the recess 23 of the workpiece 9.
  • the clamping device 2 is tensioned; the clamped state of the clamping device 2 is shown in FIG Fig. 3 shown.
  • the mandrel 6 Due to a relatively low second spring stiffness of the second elastic element 22 compared to a first spring stiffness of the first elastic element 14, the mandrel 6 initially remained almost stationary during this movement of the expansion element 15 relative to the counter bearing 4, because the relatively hard first elastic element 14 has kept the mandrel 6 away from the counter bearing 4.
  • the spreading element 15 was able to overcome the comparatively low force of the second elastic element 22 and move downward relative to the mandrel 6 and thereby spread the spreading jaws with the conical surface-shaped surfaces 16 more and more radially.
  • the workpiece 9 is therefore not only secured against lateral displacement 26 relative to the base plate 8 by the clamping mandrel 6, which blocks in the form fit, but also sits on the base plate 8 with no play in the axial direction (see actuation axis BA) on.
  • An axial movement 27 of the workpiece 9 is not possible due to the frictional connection with the mandrel 6.
  • the workpiece 9 is typically subjected to a processing, in particular a drilling or milling processing, or also a measurement, in particular a measurement of its outer dimensions.
  • the Fig. 4 shows a second embodiment of a mandrel arrangement 1 according to the invention. Only the essential differences from the first embodiment are explained.
  • a recess 30 for receiving the mandrel 6 is formed in the base plate 8, which recess forms a shoulder-like stop 31 on the side facing the clamping device 2.
  • the mandrel 6 can therefore not be passed down through the recess 30; the recess 30 is thus with respect to the clamping mandrel 6 (or its radial width) not continuous.
  • the recess 30 merges into an opening 32 through which the actuator 7 and the first elastic element 14 are or can be passed, this opening 32 is not wide enough for the mandrel 6.
  • the clamping assembly 10 comprising the clamping device 2, the counter bearing 4, the actuator 7 and the clamping mandrel 6, is here permanently arranged on the base plate 8 or its recess 30 by encompassing the base plate 8 on both sides in the region of the stop 31; the clamping assembly 10 could only be removed from the base plate 8 by dismantling it.
  • the counter bearing 4 is also formed on a collar element 33, which is supported on the base element 5.
  • a third elastic element 34 here again designed as a helical spring 34a under compressive stress, biases the base plate 8 against the bracing direction VR with respect to the counter bearing 4; Base plate 8 and counter bearing 4 are, so to speak, pushed apart.
  • the third elastic element 34 engages here on the counter bearing 4 and on a recessed shoulder 35 of the base plate 8, the shoulder 35 lying on the other side of the rear bearing 24.
  • the actuator 7 including the expansion element 15 and also the clamping mandrel 6 are drawn into the recess 30, essentially up to the stop 31.
  • the clamping device 2 is in a relaxed state.
  • the mandrel 6 and the clamping assembly 10 as a whole are withdrawn behind the front bearing 12 and the associated front bearing plane 13. This makes it possible to move the workpiece 9 on the first bearing 12 in a lateral direction transverse to the actuation axis BA, cf. lateral shift 26.
  • a recess 36 designed as a blind hole is formed here.
  • the workpiece 9 can be arranged at least approximately with its recess 36 above the mandrel 6 or above the recess 30 of the base plate 8.
  • the clamping assembly 10 is then pushed upwards by an operator relative to the base plate 8 until the counter bearing 4 rests on the rear bearing 24 of the base plate 8, cf.
  • the third elastic element 34 is compressed against its spring force.
  • the mandrel 6 penetrates into the recess 36 of the workpiece 9; typically the workpiece 9 is held manually by the operator so that it does not move upwards if there should already be a noticeable friction between the mandrel 6 and the inner wall of the recess 36 of the workpiece 9.
  • the clamping device 2 is then tensioned, cf. Fig. 6
  • the eccentric lever 3 is pivoted to the left.
  • the actuator 7 together with the expansion head 15 is pulled downwards towards the counter bearing 4 in the bracing direction VR.
  • the mandrel 6 initially spreads open, and after the pressure of the expanding jaws of the mandrel 6 has been reached in the recess 36 of the workpiece 9, the workpiece 9 is pulled down onto the base plate 8.
  • the actuator 7 is placed under considerable tensile stress.
  • the workpiece 9 is secured against lateral displacement 26 by a positive fit by means of the mandrel 6, which engages in both recesses 36, 30, and is secured against axial movement 27 by a force fit by means of the expanding jaws of the clamping mandrel 6.
  • the workpiece 9 is typically again subjected to a machining or measurement.
  • the machining is preferably carried out with the workpiece 9 at rest.
  • the second elastic clamping device 22 helps to cancel the spreading of the expanding jaws of the mandrel 6, and the third spring element 34 helps to retract the mandrel 6 or the clamp assembly 10 behind the front bearing 12 and thus completely out of the recess 36 of the workpiece 9 so that it can be moved again in the lateral direction on the first bearing 12 of the base plate 8, cf. lateral displacement 26, for example for a workpiece change.
  • the workpiece 9 can then also be lifted off in the axial direction, cf. axial movement 2 if desired.
  • Fig. 7 shows in schematic cross section a mandrel 6 for the invention.
  • the mandrel 6 On its clamping jaws 18a, the mandrel 6 has radially outwardly profiled contact surfaces 40, which here are jagged with prongs directed downwards (towards the foot part 21 of the mandrel 6). With the profiled contact surfaces 40, an improved hold in the recess of a workpiece is possible.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)

Claims (16)

  1. Ensemble (1) à mandrin de serrage dévolu à l'ablocage d'une pièce (9), comprenant
    - un mandrin de serrage (6) déployable, conçu pour pénétrer dans un évidement (23 ; 36) de la pièce (9),
    - un contre-palier (4) dédié à l'appui direct ou indirect de ladite pièce (9),
    - un actionneur (7), muni d'un élément de déploiement (15) et mobile par rapport au mandrin de serrage (6) le long d'un axe d'actionnement (BA), ledit mandrin de serrage (6) pouvant être déployé sous l'effet d'un mouvement relatif dudit élément de déploiement (15) par rapport audit mandrin de serrage (6), le long d'une direction d'ablocage (VR) s'étendant parallèlement à l'axe d'actionnement (BA), et ledit mandrin de serrage (6) étant de réalisation mobile par rapport au contre-palier (4), le long dudit axe d'actionnement (BA), et
    - un premier élément élastique (14) par lequel ledit mandrin de serrage (6) est soumis, par rapport au contre-palier (4), à une précontrainte l'éloignant dudit contre-palier (4) en sens inverse de la direction d'ablocage (VR),
    comportant une plaque de base (8) sur laquelle sont ménagés un palier antérieur (12), conçu pour procurer un appui à la pièce (9), et un palier postérieur (24) conçu pour procurer un appui au contre-palier (4),
    laquelle plaque de base (8) forme un évidement (11 ; 30), le mandrin de serrage (6) pouvant être intégralement rétracté dans ledit évidement (11 ; 30), le long de l'axe d'actionnement (BA), jusqu'à la zone située derrière le palier antérieur (12),
    et comportant un dispositif de serrage (2) au moyen duquel un mouvement peut être imprimé à l'actionneur (7), le long de la direction d'ablocage (VR), vers le contre-palier (4) et vers la plaque de base (8),
    caractérisé par le fait
    que la plaque de base (8) constitue un guide affecté au mandrin de serrage (6), en particulier au moyen de l'évidement (11 ; 30) pratiqué dans ladite plaque de base (8) ;
    et par la présence d'un deuxième élément élastique (22) par lequel l'actionneur (7) est précontraint, par rapport audit mandrin de serrage (6), en sens inverse de la direction d'ablocage (VR).
  2. Ensemble (1) à mandrin de serrage, selon la revendication 1, caractérisé par le fait que l'actionneur (7) est pourvu d'une tige de traction (7a) et, lors d'un mouvement dudit actionneur (7) le long de la direction d'ablocage (VR), le dispositif de serrage (2) tire l'élément de déploiement (15) vers le contre-palier (4) au moyen de ladite tige de traction (7a),
    sachant notamment que ladite tige de traction (7a) est guidée vers ledit dispositif de serrage (2) en traversant ledit contre-palier (4) de part en part.
  3. Ensemble (1) à mandrin de serrage, selon l'une des revendications précédentes, caractérisé par le fait qu'une première constante de rappel du premier élément élastique (14) est supérieure à une deuxième constante de rappel du deuxième élément élastique (22).
  4. Ensemble (1) à mandrin de serrage, selon l'une des revendications précédentes, caractérisé par le fait que le deuxième élément élastique (22) est muni d'un ressort hélicoïdal (22a) qui pousse l'élément de déploiement (15) à l'écart d'une partie d'embase (21) du mandrin de serrage (6), en sens inverse de la direction d'ablocage (VR).
  5. Ensemble (1) à mandrin de serrage, selon l'une des revendications précédentes, caractérisé par le fait que l'élément de déploiement (15) est doté d'une ou plusieurs surface(s) (16) en forme d'enveloppe conique, et/ou le mandrin de serrage (6) forme une ou plusieurs surface(s) complémentaire(s) (17) en forme d'enveloppe conique, dédiée(s) audit élément de déploiement (15).
  6. Ensemble (1) à mandrin de serrage, selon l'une des revendications précédentes, caractérisé par le fait que le mandrin de serrage (6) est réalisé pour l'essentiel en forme de douille, sachant qu'au moins l'élément de déploiement (15) peut être déplacé axialement dans ledit mandrin de serrage (6), en vue de déployer ledit mandrin de serrage (6).
  7. Ensemble (1) à mandrin de serrage, selon la revendication 6, caractérisé par le fait que le deuxième élément élastique (22) est logé dans l'espace interne du mandrin de serrage (6).
  8. Ensemble (1) à mandrin de serrage, selon l'une des revendications précédentes, caractérisé par le fait que le mandrin de serrage (6) est doté de plusieurs mâchoires déployables (18a, 18b) mutuellement séparées par des espaces interstitiels (19) s'étendant, pour l'essentiel, parallèlement à l'axe d'actionnement (BA).
  9. Ensemble (1) à mandrin de serrage, selon la revendication 8, caractérisé par le fait que le mandrin de serrage (6) comporte une partie d'embase (21) commune, au-delà de laquelle les mâchoires déployables (18a, 18b) font saillie, le deuxième élément élastique (22) prenant appui contre ladite partie d'embase (21) dudit mandrin de serrage (6), et contre l'élément de déploiement (15).
  10. Ensemble (1) à mandrin de serrage, selon l'une des revendications 1 à 9, caractérisé par le fait que l'évidement (30) de la plaque de base est pourvu d'une butée (31) limitant une insertion axiale du mandrin de serrage (6) dans ladite plaque de base (8).
  11. Ensemble (1) à mandrin de serrage, selon l'une des revendications 1 à 9, caractérisé par le fait que l'évidement (11) de la plaque de base (8) est de réalisation continue, de sorte que le mandrin de serrage (6) peut être intégralement guidé, de part en part, à travers ledit évidement (11) de ladite plaque de base (8).
  12. Ensemble (1) à mandrin de serrage, selon l'une des revendications précédentes, caractérisé par la présence d'un troisième élément élastique (34) au moyen duquel, lorsque le contre-palier (4) et le palier postérieur (24) sont en applique l'un contre l'autre, ledit contre-palier (4) est soumis le long de l'axe d'actionnement (BA), par rapport à la plaque de base (8), à une précontrainte l'éloignant de ladite plaque de base (8).
  13. Ensemble (1) à mandrin de serrage, selon l'une des revendications précédentes, caractérisé par le fait que le dispositif de serrage (2) est muni d'un levier excentré (3).
  14. Ensemble (1) à mandrin de serrage, selon l'une des revendications précédentes, caractérisé par le fait qu'une ou plusieurs surface(s) profilée(s) de contact (40), en particulier des surfaces dentelées de contact (40) dévolues à une venue en applique contre la paroi de l'évidement (23 ; 36) de la pièce (9), est (sont) ménagée(s) sur le mandrin de serrage (6).
  15. Utilisation d'un ensemble (1) à mandrin de serrage conforme à l'une des revendications précédentes, caractérisée par le fait que, lorsque le mandrin de serrage (6) est inséré dans l'évidement (23 ; 36) de la pièce (9), l'actionneur (7) est mû vers le contre-palier (4) le long de la direction d'ablocage (VR), à l'aide du dispositif de serrage (2), d'une course telle que ledit mandrin de serrage (6) subisse une contrainte de déploiement, dans ledit évidement (23 ; 36), et que ladite pièce (9) soit mise en applique contre la plaque de base (8), avec absence de jeu, et donc indirectement sur ledit contre-palier (4).
  16. Utilisation selon la revendication 15, caractérisée par le fait que, lorsque la pièce (9) se trouve en applique contre la plaque de base (8), avec absence de jeu, ladite pièce (9) est soumise à un usinage par perçage et/ou à un usinage par fraisage.
EP19150211.1A 2018-01-10 2019-01-03 Agencement de broche de serrage à effet de traction vers le bas Active EP3520965B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018200267.3A DE102018200267B3 (de) 2018-01-10 2018-01-10 Vollständig in eine Grundplatte zurückziehbare Spanndorn-Anordnung mit Niederzugeffekt

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EP3520965A1 EP3520965A1 (fr) 2019-08-07
EP3520965B1 true EP3520965B1 (fr) 2020-08-26

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EP19150211.1A Active EP3520965B1 (fr) 2018-01-10 2019-01-03 Agencement de broche de serrage à effet de traction vers le bas

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EP (1) EP3520965B1 (fr)
DE (1) DE102018200267B3 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8313452U1 (de) 1983-05-06 1983-10-20 Keller, Karl, 7312 Kirchheim Spanndorn
JPH01170532A (ja) 1987-12-25 1989-07-05 Kosumetsuku:Kk シリンダ形油圧クランプ
EP0785049B1 (fr) 1996-01-15 2004-11-03 Cianci, Pasquale, Dipl.-Ing Table de support avec dispositif de serrage
JP3550010B2 (ja) * 1997-12-24 2004-08-04 株式会社コスメック クランプ装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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EP3520965A1 (fr) 2019-08-07
DE102018200267B3 (de) 2019-05-09

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