EP3943244A1 - Dispositif de serrage et procédé de serrage - Google Patents

Dispositif de serrage et procédé de serrage Download PDF

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Publication number
EP3943244A1
EP3943244A1 EP20187345.2A EP20187345A EP3943244A1 EP 3943244 A1 EP3943244 A1 EP 3943244A1 EP 20187345 A EP20187345 A EP 20187345A EP 3943244 A1 EP3943244 A1 EP 3943244A1
Authority
EP
European Patent Office
Prior art keywords
clamping
jaws
clamping device
workpiece
positive
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.)
Pending
Application number
EP20187345.2A
Other languages
German (de)
English (en)
Inventor
Günter Lang
Philipp Lang
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.)
Lang Technik GmbH
Original Assignee
Lang Technik GmbH
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 Lang Technik GmbH filed Critical Lang Technik GmbH
Priority to EP20187345.2A priority Critical patent/EP3943244A1/fr
Publication of EP3943244A1 publication Critical patent/EP3943244A1/fr
Pending legal-status Critical Current

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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
    • B25B1/00—Vices
    • B25B1/24—Details, e.g. jaws of special shape, slideways
    • B25B1/2405—Construction of the jaws
    • B25B1/2452—Construction of the jaws with supplementary jaws

Definitions

  • the invention relates to a clamping device, in particular for clamping workpieces for mechanical processing of the same.
  • the invention also relates to a corresponding tensioning method.
  • the clamping must be able to absorb and dissipate the machining forces that occur.
  • the transmission of the machining forces from the workpiece to the clamping must be designed in such a way that the workpiece remains securely in the desired clamping position before and during machining.
  • the EP 1 071 542 B1 propose forming a positive-locking structure on the workpiece near its base area, into which corresponding coupling structures of clamping jaws of a vise grip.
  • the result is a mixed form-fitting and friction-locking clamping that takes up very little space on the workpiece, so that almost complete 5-sided machining is possible.
  • a workpiece machined in this way has an unmachined base surface and the clamping structures mentioned. If the base area and the area occupied by the clamping structures are to be machined, a different clamping must be found.
  • the concept according to the invention is based on the idea of picking up workpieces on surfaces that have already been machined and of constructing jaws for this purpose in such a way that they rest flat on machined contours of a workpiece.
  • a clamping device according to the invention is used to realize this concept, which is provided and set up in particular for clamping workpieces for mechanical processing of the same, but can also be used in other ways.
  • the clamping device has two clamping jaws, at least one of which is movably mounted towards and away from the other, with each clamping jaw having a positive-locking structure and a contact surface.
  • the form-fitting structures of the two clamping jaws are arranged opposite one another and face one another.
  • the contact surfaces of the two clamping jaws are arranged opposite one another and face one another.
  • the clamping device also includes two top jaws that can be releasably connected to the clamping jaws. For this purpose, they have a complementary structure that matches the form-fit structures of the clamping jaws and a counter-contact surface. The counter-abutment surface is intended to rest against the abutment surface of the clamping jaw.
  • the clamping device also includes a fixing device with which a top jaw can be fixed to a clamping jaw.
  • the top jaws are preferably made of an easily workable material such as aluminum or an aluminum alloy, a plastic, a fiber composite material or another material that is suitable for the necessary clamping forces from the clamping jaws to transfer the workpiece and the machining forces from the workpiece to the clamping jaws without suffering any disruptive deformation.
  • an easily workable material such as aluminum or an aluminum alloy, a plastic, a fiber composite material or another material that is suitable for the necessary clamping forces from the clamping jaws to transfer the workpiece and the machining forces from the workpiece to the clamping jaws without suffering any disruptive deformation.
  • the clamping device comprises an adjustment device which can move at least one of the two clamping jaws in an adjustment direction, preferably linearly, toward and away from the other clamping jaw. Both clamping jaws are preferably linearly movable and can be adjusted towards and away from one another.
  • the clamping jaws are preferably designed in such a way that they can be used to clamp a workpiece without top jaws.
  • the positive-locking structures can be formed by a plurality of teeth arranged in a grid.
  • the grid can be a linear grid or a two-dimensional grid.
  • the teeth may be arranged in a row, evenly spaced from each other. This allows a voltage of workpieces along the lines of the EP 1 071 542 B1 respectively.
  • the top jaws can be used to machine the sixth side and the remaining areas of the parts of the workpiece used for clamping. These are fixed to the clamping jaws and they then pick up the workpiece on surfaces of the workpiece that have already been machined.
  • top jaws are initially provided as solid bodies without a workpiece receiving structure which, when they are fixed to the clamping jaws and moved towards one another, come into surface contact with one another.
  • a workpiece contour can be incorporated, for example milled, into the two top jaws machined against one another. This can be done on the basis of the data set that was used to machine the workpiece. While this record for the workpiece to be created defines the outer contour, it is now used to process the top jaws to create the appropriate inner contour.
  • the positive-locking structures of the two clamping jaws are arranged in a common plane.
  • a tooth of the form-fitting structure of one of the two clamping jaws is preferably aligned in the adjustment direction with a tooth of the form-fitting structure of the other of the two clamping jaws.
  • the teeth of the two clamping jaws are to a certain extent "on a gap" so that it is immediately apparent if the two top jaws are confused with one another.
  • a top jaw is permanently assigned to its clamping jaws in order to rule out errors that could otherwise occur if the two top jaws were mixed up.
  • the positive-locking structures can be arranged on the contact surfaces. However, it is preferred to arrange the positive-locking structures outside of the contact surfaces of the clamping jaws.
  • the contact surfaces can be plane surfaces.
  • a magnetic holding device is preferably provided as the fixing device.
  • the clamping jaws consist at least partially of a ferromagnetic material.
  • the top jaws can be provided with permanent magnets and otherwise consist of non-magnetic or diamagnetic material. It is preferred that each top jaw at least one, preferably two permanent magnets, which are arranged on the counter-bearing surface.
  • each top jaw can have at least one pocket in which a permanent magnet is held. The permanent magnet is preferably secured in the pocket by a clamping effect, so that the permanent magnet can be removed from the pocket when the top jaw is recycled.
  • the inventive method uses for a clamping device a vise with two clamping jaws, the preferably form-fitting structures, for example, on the model of EP 1 071 542 B1 exhibit.
  • the clamping jaws are assigned top jaws, which are initially provided as blanks.
  • the blanks have a complementary structure for the form-fitting structure of the clamping jaws. Moreover, they are designed in such a way that they rest against the contact surfaces of the clamping jaws with counter-abutment surfaces as soon as the complementary structures are in engagement with the positive-locking structures.
  • top jaws To form the workpiece contour in the top jaws, these are first clamped with their end faces against each other.
  • the workpiece contour is then machined into the top jaws using a suitable tool, for example a milling tool, based on the data set describing the workpiece.
  • a controlled dimensional allowance can be provided, so that the contour worked into the top jaws is smaller by a desired amount than the contour of the workpiece to be clamped.
  • the dimensional allowance can be defined uniformly for the entire contour or also locally differently in order to enable the workpiece to be securely clamped in the machined contour without damaging the workpiece.
  • top jaws After the workpiece contour has been worked into the top jaws, a machined workpiece can be picked up by them.
  • the top jaws can now from the Jaws removed and kept ready for later use. It is also possible to use them immediately to clamp workpieces that have already been pre-machined.
  • the work sequence is typically as follows: First, a workpiece is prepared for 5-sided machining by attaching complementary structures to the workpiece that match the positive-locking structures of the clamping jaws. This can be done in an embossing station, for example. The workpiece is then received between the clamping jaws, with the complementary structures of the workpiece being in engagement with the form-fitting structures of the clamping jaws and the clamping jaws being clamped against the workpiece. The workpiece is machined in this state, with the clamping being maintained throughout the machining process. Once this processing is complete, the workpiece is unclamped and the top jaws are placed on the clamping jaws. The workpiece can now be clamped in the prepared contour of the top jaws. The complementary structure and its base are now exposed for editing.
  • top jaws are used up or have become obsolete when the workpiece shape is changed, they can be disposed of and recycled. If the top jaws are made of aluminum, this is particularly easy.
  • the magnets contained in the top jaws can be detached from their clamping seat with a simple hand tool, for example a screwdriver, and grasped separately or reused.
  • the top jaws prepared in this way for recycling can be melted down.
  • FIG 1 a clamping device 10 with a workpiece 11 accommodated therein is illustrated schematically.
  • the clamping device serves to hold the workpiece in a manner suitable for 6-sided machining. It is assumed here that the workpiece 11 is initially held in a manner that enables 5-sided machining, while it is held in the figure 1 eagerly ready to work on his sixth side.
  • the clamping device 10 has a vise 12 to which a base body 13 belongs. This is set up for connection to a machine tool and for this purpose has several, for example four, clamping bolts 14 to 17 provided on its underside.
  • the clamping bolts 14 to 17 are, for example, essentially cylindrical bodies which are provided with an annular groove and which fit into corresponding receiving openings in a clamping plate.
  • Corresponding clamping slides acting, for example, laterally on each clamping bolt 14 to 17 and engaging in the respective annular grooves press the clamping bolts 14 to 17 against the wall of the receiving opening and thus lead to a secure and precise positioning of the vice 12 in relation to the clamping plate, not shown.
  • Two clamping jaws 18, 19 are mounted on the base body 13 so that they can be adjusted linearly toward and away from one another.
  • the base body 13 has corresponding guide structures, for example sliding surfaces 20 , 21 and guide grooves 22 , 23 .
  • the two clamping jaws 18, 19 are engaged with a rotatably mounted threaded spindle 24.
  • the threaded spindle 24 is centrally mounted on the base body 13 so that it cannot be moved axially, but is rotatable.
  • the threaded spindle has threads on both sides of this bearing, namely a right-hand thread on one side and a left-hand thread on the opposite side. Appropriate Threads are formed in the jaws 18,19. By rotating the threaded spindle 24, the clamping jaws 18, 19 are moved towards or away from each other.
  • the clamping jaws 18, 19 are assigned top jaws 25, 26 which are releasably fixed to the clamping jaws 18, 19.
  • the top jaws 25, 26 together have an inner contour 27, which can be seen in FIG.
  • the inner contour 27 is defined by the wall of an opening which is delimited jointly by the two top jaws 25, 26 when the two top jaws 25, 26 are possibly moved together to a vanishing gap of a few 100ths or 10ths of a millimeter.
  • top jaws 25, 26 are releasably fixed to the clamping jaws 18, 19.
  • click on figure 2 refer, in which first top jaw blanks 25a, 26a are illustrated, where the inner contour 27 is still missing.
  • the top jaw blanks 25a, 26a are adapted to the shape of the clamping jaws 18, 19 in their jaw-side contour.
  • the clamping jaws 18, 19, which are preferably made of steel or another ferromagnetic, in particular soft-magnetic material, have a row of teeth 28, 29 on the sides facing one another. These are in figure 2 right above the second clamping jaw 19 exemplified enlarged.
  • the teeth 28, 29 of the clamping jaw 19 form a form-fitting structure 30.
  • Such a form-fitting structure 31 is formed at the same height on the opposite first clamping jaw 18.
  • the teeth 28, 29 and the teeth of the positive-locking structure 31 preferably lie in a common plane.
  • the pairs of opposing teeth of the two clamping jaws 18, 19 can be arranged in alignment with one another in the adjustment direction V.
  • the adjustment direction V is specified by the linear guide formed by the base body 13 .
  • the clamping jaws 18, 19 have contact surfaces 32, 33, which are preferably designed as flat surfaces and can be arranged below the form-fitting structures 30, 31.
  • the contact surfaces 32, 33 are preferably oriented parallel to one another and face one another. Support shoulders 34, 35 can be formed above the same.
  • the top jaw blanks 25a, 26a have complementary structures 36, 37 that match the positive-locking structures 30, 31.
  • the complementary structure 37 of the top jaw blank 25a is illustrated as an example.
  • Complementary structure 37 includes a series of indentations 38 that mate with corresponding teeth of interlocking structure 31 .
  • the complementary structure 36 has corresponding depressions ( figure 2 ) that fit the teeth 28, 29 of the form-fitting structure 30.
  • top jaw blank 25a has a counter-contact surface 39, which is connected to the contact surface 33 in Contact is as soon as the complementary structure 37 is in engagement with the form-fitting structure 31 .
  • a corresponding counter-contact surface 40 is provided on the top jaw blank 26a ( figure 2 ).
  • fixing devices are provided, of which the fixing device 41 of the top jaw blank 25a in figure 6 is illustrated as an example.
  • the top jaw blank 26a has a corresponding fixing device, for which the following description applies accordingly.
  • the fixing device 41 includes at least one permanent magnet or, as in figure 6 shown, two permanent magnets 42,43 placed in respective pockets 44,45.
  • the pockets 44, 45 are provided in the mating surface 39 of the top jaw blank 25a.
  • the pocket 44 has a first portion 44a which is large enough to accommodate a cylindrical permanent magnet 42, for example, disc-like in shape, within the pocket.
  • the pocket 44 preferably has a second section 44b, the contour of which is so narrow that the permanent magnet 42 jams in the pocket 44 when it is pushed into this area.
  • the permanent magnet 42 has a circular cross-section
  • the pocket preferably has an elongate, for example oval, contour.
  • the mutually opposite side walls 44c, 44d are preferably at an acute angle to one another, measured both in the displacement direction of the permanent magnet 42 and measured in the depth of the pocket 44.
  • the pocket 44 has a certain undercut.
  • the permanent magnet 42 is as shown in the detail view figure 6 appears on the right, by lateral displacement in the Bag 44 clampable. In this way it is not pulled out of the pocket even by large axial forces.
  • the pocket 45 is designed accordingly, the above description of the pocket 44 applies accordingly.
  • the clamping device 10 is used as follows:
  • the clamping device 10 is set up for clamping a tool piece which has complementary structures for interacting with the positive-locking structures 30 , 31 .
  • the clamping of such workpieces is based on the model and teaching of EP 1 071 542 B1 or in a similar way.
  • the workpiece is first provided with suitable complementary structures, for example in an embossing station or by other suitable means, and is clamped between the two clamping jaws 18, 19 in a mixed positive and frictional manner.
  • suitable complementary structures for example in an embossing station or by other suitable means
  • the clamping device 10 is used for this purpose with the top jaws 25, 26 belonging to it.
  • they are first provided as top jaw blanks 25a, 26a. They are made of aluminum, for example, and can, like it figure 2 indicates to be attached to the clamping jaws 18, 19 and fixed to them.
  • the positive-locking structures 30, 31 of the clamping jaws 18, 19 engage in the complementary structures 36, 37 of the top jaw blanks 25a, 26a.
  • the fixing device 41 of the first top jaw blank 25a fixes the top jaw blank 25a on the clamping jaw 18.
  • a similarly designed fixing device attaches the top jaw blank 26a to the clamping jaw 19.
  • This state is in figure 3 illustrated.
  • the two clamping jaws 18, 19 are moved towards one another by turning the threaded spindle 24 in such a way that the two top jaw blanks 25a, 26a, as in figure 4 shown, abut one another with their end faces and preferably bear against one another with pretension.
  • the in figure 5 The illustrated inner contour 27 is incorporated into the two top jaw blanks 25a, 26a made of aluminum, for example, so that the two top jaws 25, 26 with the desired workpiece contour are finally available.
  • the workpiece 11 can now be clamped in this inner contour 27 by first moving the clamping jaws 18, 19 slightly apart, inserting the workpiece 11 into the inner contour 27 and then by tightening the threaded spindle 24, the workpiece 11 is clamped.
  • the top jaws 25, 26 can be kept ready and used again whenever they are needed, without having to produce the top jaws 25, 26 again. If they are used up or if a change is made to a different workpiece type, corresponding top jaws 25, 26 are newly produced from the blanks 25a, 26a using the corresponding workpiece data record.
  • the clamping jaws 18, 19 of the clamping device 10 are reversible. They can be unscrewed from the threaded spindle 24, rotated through 180° and placed back on the base body 13 and engaged again with the threaded spindle 24.
  • the clamping jaws 18, 19 have form-fitting structures 30', 31', for which the previous description of the positive-locking structures 30, 31 applies accordingly.
  • the clamping jaws 18, 19 preferably have planar contact surfaces 32', 33' parallel to one another on their sides that now face one another, to which the description of the contact surfaces 32, 33 applies correspondingly.
  • the clamping jaws 18, 19 are assigned top jaw blanks 25a', 26a', the nature of which is also consistent with the description given for the top jaw blanks 25a, 26a.
  • the fixing devices 41 are formed in the corresponding mating surfaces 40', 39'.
  • Corresponding pockets for accommodating magnets can be provided, these pockets 44', 45' being designed in accordance with the previous description of pockets 44, 45.
  • You can, as in figure 2 and 6 illustrated, lying or according to figure 9 be arranged standing. In any case, however, they have an insertion section 44a and a clamping section 44b. These sections are dimensioned such that a permanent magnet inserted into the pocket 44' is clamped between the side walls 44c, 44d.
  • top jaw blanks 25a', 26a' are as shown in FIG figure 7 and figure 8 attached to the jaws 18, 19 and as above in connection with the Figures 1 to 6 machined as described to produce top jaws. These are used in accordance with the above description of the previous exemplary embodiment.
  • the permanent magnets 42, 43 can be easily removed from the corresponding top clamping jaws 25, 26. They are urged out of their clamped position between side walls 44c, 44d, for example by inserting the blade of a screwdriver into portion 44b of pocket 44 and twisting slightly. Get the permanent magnet then out of its clamp seat into the region 44a of the pocket 44, it falls out of this and can be seized separately. The remaining top jaw can now be recycled, for example by being melted down.
  • the vise 12 with the top jaws 25, 26 can also be used for workpieces 11 which themselves do not have or have not had a complementary structure.
  • the invention is independent of the manner in which the workpiece 11 has been clamped and processed before being clamped between the top jaws 25, 26.
  • top jaws 25, 26 are assigned to a vice and can be fixed in the correct position on the clamping jaws 18, 19.
  • positive-locking structures 30, 31 are used, which are formed on the clamping jaws and are otherwise used to clamp workpieces.
  • the top jaws have corresponding complementary structures 36, 37 and a fixing device which consists, for example, of permanent magnets which are embedded in the top jaws 25, 26 and are held there, preferably in a clamped but detachable manner.
  • the top jaws 25, 26 are preferably made of a material that is easy to process, such as aluminum, and can thus be provided with an inner contour 27, which is adapted to the workpiece 11, based on the data set that is otherwise used for processing the workpiece.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)
EP20187345.2A 2020-07-23 2020-07-23 Dispositif de serrage et procédé de serrage Pending EP3943244A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20187345.2A EP3943244A1 (fr) 2020-07-23 2020-07-23 Dispositif de serrage et procédé de serrage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20187345.2A EP3943244A1 (fr) 2020-07-23 2020-07-23 Dispositif de serrage et procédé de serrage

Publications (1)

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EP3943244A1 true EP3943244A1 (fr) 2022-01-26

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EP20187345.2A Pending EP3943244A1 (fr) 2020-07-23 2020-07-23 Dispositif de serrage et procédé de serrage

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4079454A1 (fr) 2021-04-20 2022-10-26 Lang Technik GmbH Procédé et dispositif d'application d'une structure de serrage à une pièce

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2144062A (en) * 1983-07-29 1985-02-27 David Peter Mcneill Workpiece mounting arrangement
EP1071542B1 (fr) 1998-04-11 2002-05-29 Günter Lang Systeme et procede de serrage pour la fixation de pieces a usiner
US6427995B1 (en) * 1999-04-26 2002-08-06 Prairie Technical Industries, Inc. Quick change jaw system
DE102012104660A1 (de) * 2012-05-30 2013-12-05 Holger Krüger Greiferbackenanordnung
DE102014112845A1 (de) * 2014-09-05 2016-03-10 Jochen Eggert Spannbacken-Schnellverschluss, insbesondere eines Nullpunkt-Spannsystems

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2144062A (en) * 1983-07-29 1985-02-27 David Peter Mcneill Workpiece mounting arrangement
EP1071542B1 (fr) 1998-04-11 2002-05-29 Günter Lang Systeme et procede de serrage pour la fixation de pieces a usiner
US6427995B1 (en) * 1999-04-26 2002-08-06 Prairie Technical Industries, Inc. Quick change jaw system
DE102012104660A1 (de) * 2012-05-30 2013-12-05 Holger Krüger Greiferbackenanordnung
DE102014112845A1 (de) * 2014-09-05 2016-03-10 Jochen Eggert Spannbacken-Schnellverschluss, insbesondere eines Nullpunkt-Spannsystems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4079454A1 (fr) 2021-04-20 2022-10-26 Lang Technik GmbH Procédé et dispositif d'application d'une structure de serrage à une pièce

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