EP3520965A1 - 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
EP3520965A1
EP3520965A1 EP19150211.1A EP19150211A EP3520965A1 EP 3520965 A1 EP3520965 A1 EP 3520965A1 EP 19150211 A EP19150211 A EP 19150211A EP 3520965 A1 EP3520965 A1 EP 3520965A1
Authority
EP
European Patent Office
Prior art keywords
mandrel
workpiece
base plate
recess
bearing
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.)
Granted
Application number
EP19150211.1A
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German (de)
English (en)
Other versions
EP3520965B1 (fr
Inventor
André Haug
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.)
ICG GmbH and Co KG
Original Assignee
Kipp Verpachtungen EK
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Filing date
Publication date
Application filed by Kipp Verpachtungen EK filed Critical Kipp Verpachtungen EK
Publication of EP3520965A1 publication Critical patent/EP3520965A1/fr
Application granted granted Critical
Publication of EP3520965B1 publication Critical patent/EP3520965B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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

  • An attachment of a workpiece can be done in particular with a so-called mandrel.
  • the mandrel is introduced relative to the workpiece axially in a recess of the workpiece and radially spread. This jams the mandrel in the workpiece and can hold it in position.
  • the spreading of the mandrel can be done with a wedge-shaped expansion element, which is moved in the axial direction in the mandrel, such as by screwing.
  • the braced workpiece is typically on a counter bearing, which is formed on a lower part of the mandrel component.
  • Such a mandrel is for example from the Catalog "Control Elements
  • Such mandrels can accurately position a workpiece transverse to the axis of the mandrel.
  • an additional clamping device is used, which presses the workpiece onto the counter bearing.
  • a mandrel arrangement in which a sleeve clamping mandrel is displaceably mounted on a base body via a resilient pressure piece.
  • a clamping cone In the sleeve mandrel a clamping cone is arranged, which has an intermediate piece can be moved axially relative to the main body. By pulling down the clamping cone both the sleeve mandrel is spread radially, as well as drawn axially to the body.
  • a workpiece can also be clamped in the axial direction by being used on the base body, so that an additional clamping device is not necessary.
  • Such workpieces are typically introduced for attachment to the mandrel assembly along the axis of rotation of the workpiece or along the axis of the mandrel to the mandrel and placed on the mandrel, and then the mandrel is spread. After machining, the mandrel is first relaxed and then lifted the workpiece along the axis of the mandrel and led away.
  • the known mandrel arrangement can also be used well.
  • a workpiece transport axis along the axis of the mandrel is often not provided, for example for cost reasons, or would be cumbersome for the process flow in the context of the proposed processing. It may simply be too little space for an axial lifting of the workpiece, especially in manual workpiece handling. However, then often a workpiece transport axis is arranged transversely to the axis of the mandrel, or would be more efficient for the process flow, such as to perform a further machining on the workpiece at the same axial position, but at a different lateral position. Also, often for reasons of space, a workpiece feed from the side is particularly easy set up, again in particular with manual workpiece handling. In such applications, however, the mandrel would block the workpiece against a process.
  • the invention has for its object to present a mandrel arrangement that can be used well with a workpiece transport transverse to the axis of the mandrel.
  • a mandrel arrangement of the type mentioned which is characterized that a base plate is present, on which a front bearing is formed for a bearing of the workpiece and a rear bearing for a bearing of the counter bearing, that the base plate forms a recess, in which the mandrel along the actuating axis is completely retractable into the recess behind the front bearing, and that a tensioning device is provided, by means of which the actuator can be moved along the clamping direction to the counter bearing to and on the base plate.
  • an indirect installation of the workpiece is set up on the counter bearing, namely via the base plate.
  • the base plate supports itself with a rear bearing at the counter bearing, and provides with the front bearing a plant 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 Mandrel (and possibly other parts that protrude axially beyond the mandrel) completely behind the front bearing or a corresponding front bearing plane, which typically runs perpendicular to the actuating axis / Verspannrichutng, can be withdrawn.
  • a machining station or measuring station on which the mandrel arrangement is installed with a reduced space requirement axially above the mandrel (relative to its position with clamped workpiece) or axially above the workpiece (based on its braced on the base plate position) get along.
  • the invention thus simplifies workpiece transport transversely to the actuating axis of the mandrel, both for automated (mechanical) and for manual workpiece handling.
  • the actuator extends 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 formed with a pull rod, and the tensioning device on movement of the actuator along the clamping direction by means of the pull rod, the spreader pulls on the counter bearing, in particular wherein the pull rod through the counter bearing through to Chuck is guided.
  • more complex power transmission such as with a push rod and a C-shaped throw, come into consideration.
  • a second elastic element is present, with which the actuator is biased against the mandrel opposite to the clamping direction.
  • the expansion element is automatically pushed back axially against the clamping direction when the tensioning device is unloaded, so that the mandrel returns to a non-spread-open position.
  • the radial strain of the workpiece is then released very reliable in relaxation of the clamping device; In particular, no access from above (from the side facing away from the counter bearing) through the workpiece on the mandrel necessary to pick up (about manually) a friction-induced self-locking radial strain of the workpiece.
  • the second elastic element may in particular be designed as a compression spring.
  • a first spring rate of the first elastic element is greater than a second spring rate of the second elastic element. This ensures that in the course of the tensioning of the tensioning device, ie when moving the actuator along the clamping direction towards the counter bearing, first of all the radial spreading of the mandrel can take place (and thereby the workpiece is taken), and then above all (when gripped workpiece) the axial pulling down of the workpiece can take place. The pulling down of the workpiece thus takes place only when it is securely gripped, whereby a particularly reliable and defined attachment of the workpiece is achieved. If the spreading of the mandrel to contact the workpiece requires a significant force, this should be taken into account in the design of the spring hardness, and the first spring hardness of the first elastic member to be chosen correspondingly larger.
  • the second elastic element is formed with a helical spring which presses the expansion element away from a base part of the mandrel against the clamping direction.
  • This embodiment is particularly simple and compact.
  • the coil spring is typically completely gripped by the mandrel.
  • the expansion element is formed with one or more cone-shaped surfaces and / or the mandrel forms one or more cone-shaped mating surfaces for the expansion element.
  • the cone-shaped surfaces and / or mating surfaces By the cone-shaped surfaces and / or mating surfaces, the axial movement of the actuator in the clamping direction can be deflected in a radial movement for the spreading of the mandrel in a simple and reliable manner.
  • Cone-sheath-shaped means that the surface or counter surface describes at least a part of the surface of a cone sheath.
  • cone-shaped surfaces and other types of wedge-shaped surfaces or mating surfaces are possible, however, cone-shaped surfaces are usually very easy to manufacture and have a very low tilting tendency.
  • the mandrel is formed substantially sleeve-shaped, wherein at least the spreader for spreading the mandrel in the mandrel is axially movable.
  • the sleeve shape allows the accommodation of functional components in the interior of the mandrel, such as a second elastic member and parts of the actuator, and thus allows a particularly compact structure.
  • the mandrel is formed with a plurality of expanding jaws, which are separated by substantially parallel to the operating axis extending column.
  • the expansion jaws are typically connected at one axial end to a foot part (on the side of the counter bearing), and can bend 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 it is also possible, for example, for expanding balls to be pressed radially outward by a wedge-shaped, in particular cone-shaped, spreading element.
  • An advantageous embodiment provides that the recess of the base plate is formed with a stop which limits an axial insertion of the mandrel into the base plate. This facilitates the handling of the mandrel arrangement; the retracted mandrel can not fall through the base plate and be lost by mistake.
  • the recess of the base plate is formed continuously, so that the mandrel can be passed completely through the recess of the base plate.
  • the continuous configuration of the recess relates to the (maximum) radial width of the mandrel, with respect to which the recess has a larger (minimum) radial width to the mandrel completely to carry out.
  • a clamping assembly formed from the tensioning device, the counter bearing, the actuator and the mandrel) can be easily offset on the base plate between different through recesses of the base plate, in particular to handle a different type of workpiece.
  • the base plate in the axial direction can be made particularly thin and thus save material cost, especially in the axial direction thinner than the mandrel is long.
  • the mandrel may be pulled back behind the front bearing so that it (at least partially) on the opposite side out of the base plate is led out.
  • the base plate in particular by means of the recess in the base plate, forms a guide for the mandrel.
  • a third elastic element is present, by means of which the counter bearing is biased against the base plate in abutting counter bearing and rear bearing along the actuating axis of the base plate away. This (with the tensioning device relaxed) retraction of a terminal ensemble (formed by the entirety of mandrel, actuator, counter bearing and clamping device) is facilitated, in particular to retract the terminal ensemble or the mandrel behind the front bearing of the base plate.
  • the clamping device is formed with an eccentric lever.
  • An eccentric lever is simple and safe to handle.
  • the clamping device may be formed, for example, with a cone screw.
  • one or more profiled contact surfaces are formed on the mandrel for engagement with the wall of the recess of the workpiece.
  • the scope of the present invention also includes the use of a tensioning mandrel arrangement according to the invention, which is characterized in that, with the tensioning device inserted into the recess of the workpiece, the actuator is moved along the clamping direction so far towards the counterbearing, that the mandrel is spread in the recess spread and the workpiece is applied without play to the base plate and thus indirectly to the counter bearing.
  • the attachment of the workpiece to the base plate is robust, and both in the axial direction and across it precise and well reproducible. Accordingly, machining processes and measurements are possible with great accuracy.
  • the Fig. 1 shows in a schematic longitudinal section and Fig. 2 in a side view at 90 ° rotation relative to the Fig. 1 a mandrel arrangement 1 according to the invention.
  • the mandrel arrangement 1 comprises a tensioning device 2 (here formed with an eccentric lever 3), a counter bearing 4 (here formed on a base element 5 on which the eccentric lever 3 is mounted), a here substantially sleeve-shaped mandrel 6, an actuator 7 and a base plate 8.
  • the entirety (contiguous assembly) of clamping device 2, counter bearing 4, mandrel 6 and actuator 7 is also referred to as terminal assembly 10.
  • the mandrel arrangement 1 is used to attach a workpiece 9 on the base plate 8.
  • the base plate 8 is typically fixed in place, such as on a machine frame (not shown).
  • the recess 11 acts as a guide for the mandrel 6, so in that it is movable parallel to a clamping direction VR or along an actuation axis BA of the actuator 7 in the base plate 8.
  • the clamp assembly 10 is loosely inserted into the recess 11 of the base plate 8 in the state shown (with a relaxed clamping device 2), and could easily be pulled down as far as desired from the recess 11.
  • the clamp assembly 10 could be pulled down so far that the mandrel 6 and the clamp assembly 10 can be completely withdrawn entirely behind a front bearing 12 of the base plate 8, which is here formed with a front bearing plane 13; the recess 11 is thus continuous with respect to the mandrel 6 (or its radial width).
  • a workpiece bearing against the front bearing 12 could be moved along the front bearing 12 in a barrier-free manner (not shown in greater detail).
  • the terminal ensemble 10 could be completely pulled out of the recess 11, in particular to put the terminal 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 mandrel 6.
  • an expansion element 15 is formed, which is formed with cone-shaped surfaces 16. These are based on cone-shaped mating surfaces 17 in the interior of the mandrel 6 from, namely on the inner sides of expansion jaws 18 a, 18 b, the are separated by axially extending column 19.
  • the column 19 are at the bottom in relief holes 20 on to prevent cracking during spreading of the expansion jaws 18a, 18b.
  • the expanding jaws 18a, 18b are from the common foot part 21 of the mandrel 6 from.
  • the actuator 7 With the tensioning 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 is extended relatively far upwards, ie against the Verspannraum VR away from the counter bearing 4, corresponding to a relaxed state of the tensioning device 2.
  • the expansion element 15 exercises in the relaxed state only a small radial force on the wedge effect of the cone-shaped surfaces 16 on the expanding mandrel 6, so that the expansion jaws 18a, 18b are pressed only slightly radially outward. In this state, the expanding mandrel 6 can be easily introduced or executed with radial clearance in a recess 23 of the workpiece 9.
  • the workpiece 9 is loosely fitted with its recess 23 on the mandrel 6 in order to prepare the clamping of the workpiece 9 on the base plate 8.
  • the terminal ensemble 10 is gripped by an operator and pressed up against the base plate 8.
  • the counter bearing 4 and a rear bearing 24 of the base plate 8 come to a mutual investment.
  • the workpiece 9 is up to the Base plate 8 pushed up, so that a lower workpiece side 25 comes to rest on the front bearing 12 of the base plate 8;
  • the mandrel 6 projects slightly deeper into the recess 23 of the workpiece 9.
  • the tensioning device 2 is tensioned; the tensioned state of the tensioning device 2 is in Fig. 3 shown.
  • the mandrel 6 Due to a relatively small second spring hardness of the second elastic member 22 compared to a first spring hardness of the first elastic member 14, the mandrel 6 has 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 14th has the mandrel 6 away from the counter bearing 4.
  • the expansion element 15 could overcome the comparatively low force of the second elastic element 22 and moved relative to the mandrel 6 down and spread the spreading jaws with the cone-shaped surfaces 16 while continuing to spread radially.
  • the workpiece 9 is not secured against the base plate 8 only by the clamping mandrel 6 which locks in the form-locking connection, but also sits without play on the base plate 8 with respect to the axial direction (see actuating 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 machining, in particular a drilling or milling, or even a measurement, in particular a measurement of its outer dimensions.
  • the Fig. 4 shows a second embodiment of a mandrel arrangement according to the invention 1. Only the essential differences from the first embodiment will be explained.
  • a recess 30 for receiving the mandrel 6 is formed in the base plate 8, which forms a shoulder-like stop 31 on the side facing the clamping device 2.
  • the mandrel 6 can therefore not be guided down through the recess 30; the recess 30 is thus with respect to the mandrel. 6
  • the clamp assembly 10 comprising the clamping device 2, the counter bearing 4, the actuator 7 and the mandrel 6, is here permanently on the base plate 8 and its recess 30 is arranged by the base plate 8 in the region of the stopper 31 engages on both sides; The clamp assembly 10 could only be removed by disassembly of the base plate 8.
  • the counter bearing 4 is formed on a collar element 33, which is supported on the base element 5.
  • a third elastic element 34 again formed here as a coil spring 34a under compressive stress, biases the base plate 8 against the clamping direction VR against the counter bearing 4; Base plate 8 and counter bearing 4 are pushed apart, so to speak.
  • the third elastic element 34 engages here on the counter bearing 4 and on a recessed shoulder 35 of the base plate 8, wherein the shoulder 35 is beyond the rear bearing 24 at.
  • the actuator 7 including the expansion element 15 and also the mandrel 6 are drawn into the recess 30, substantially to the stop 31.
  • the tensioning device 2 is in a relaxed state.
  • the mandrel 6 and the terminal ensemble 10 in total 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 the lateral direction transversely to the actuation axis BA, cf. lateral displacement 26.
  • the clamp assembly 10 For clamping the workpiece 9, the clamp assembly 10 is then pushed relative to the base plate 8 by an operator up until the counter bearing 4 abuts the rear bearing 24 of the base plate 8, see.
  • the third elastic element 34 is compressed against its spring force.
  • the mandrel 6 penetrates into the recess 36 of the workpiece 9;
  • the workpiece 9 is held manually by the operator, so that it does not dodge upwards, if already a noticeable friction between the mandrel 6 and the inner wall of the recess 36 of the workpiece 9 should occur.
  • the tensioning device 2 is tensioned, cf. Fig. 6
  • the eccentric lever 3 is pivoted to the left.
  • the actuator 7 together with the spreading head 15 in the clamping direction VR down to the counter bearing 4 is pulled.
  • the workpiece 9 is pulled down to the base plate 8.
  • the actuator 7 is set under considerable tension.
  • the workpiece 9 is secured against lateral displacement 26 by positive locking by means of the mandrel 6, which engages in both recesses 36, 30, and secured against axial movement 27 by means of frictional connection by means of the expanding jaws of the mandrel 6.
  • the workpiece 9 is typically again subjected to machining or measurement.
  • the processing preferably takes place when the workpiece 9 is at rest.
  • Fig. 7 shows in schematic cross section a mandrel 6 for the invention.
  • the mandrel 6 radially outwardly profiled contact surfaces 40, which are serrated here with down (to the foot part 21 of the mandrel 6 back) directed teeth are formed.
  • the profiled contact surfaces 40 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)
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

Publications (2)

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

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Family Applications (1)

Application Number Title Priority Date Filing Date
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)

Citations (3)

* 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
EP0785049A1 (fr) * 1996-01-15 1997-07-23 Cianci, Pasquale, Dipl.-Ing Table de support avec dispositif de serrage
EP0925871A2 (fr) * 1997-12-24 1999-06-30 Kabushiki Kaisha Kosmek Dispositif de serrage

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01170532A (ja) 1987-12-25 1989-07-05 Kosumetsuku:Kk シリンダ形油圧クランプ

Patent Citations (3)

* 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
EP0785049A1 (fr) * 1996-01-15 1997-07-23 Cianci, Pasquale, Dipl.-Ing Table de support avec dispositif de serrage
EP0925871A2 (fr) * 1997-12-24 1999-06-30 Kabushiki Kaisha Kosmek Dispositif de serrage

Also Published As

Publication number Publication date
EP3520965B1 (fr) 2020-08-26
DE102018200267B3 (de) 2019-05-09

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