EP0362753A1 - Dispositif de fixation - Google Patents

Dispositif de fixation Download PDF

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Publication number
EP0362753A1
EP0362753A1 EP89118202A EP89118202A EP0362753A1 EP 0362753 A1 EP0362753 A1 EP 0362753A1 EP 89118202 A EP89118202 A EP 89118202A EP 89118202 A EP89118202 A EP 89118202A EP 0362753 A1 EP0362753 A1 EP 0362753A1
Authority
EP
European Patent Office
Prior art keywords
clamping
pull
clamping device
jaw
workpiece
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
EP89118202A
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German (de)
English (en)
Other versions
EP0362753B1 (fr
Inventor
Manfred Schanz
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Individual
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Individual
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 Individual filed Critical Individual
Publication of EP0362753A1 publication Critical patent/EP0362753A1/fr
Application granted granted Critical
Publication of EP0362753B1 publication Critical patent/EP0362753B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B25B1/2473—Construction of the jaws with pull-down action on the workpiece

Definitions

  • the invention relates to a clamping device for holding workpieces, with clamping jaws which are adjustable relative to one another and have clamping surfaces facing one another, and with a workpiece support.
  • the object of the present invention is to provide a clamping device of the type mentioned at the outset which enables an exact positional positioning of a workpiece, in particular also on the workpiece support (Z-axis) with good repeatability, with the need for cumbersome re-measuring work to be omitted.
  • a pull-down device which can be adjusted by the workpiece to be clamped and acted upon in the clamping direction and has at least one pull-down element which projects beyond the clamping surface and can also be moved towards the support by this adjusting movement.
  • the clamping force acting on the workpiece for example in the X or Y direction, can also be used for exact positioning of the workpiece on the support, so that an additional positioning force in the Z direction, which would otherwise have to be applied from outside, is no longer required is.
  • a free space is provided at least for receiving the part of the pull-down element which projects above the clamping jaw clamping surface in an unloaded position.
  • the pull-down element can thus dodge during the adjustment movement and then, in the end positioning position of the workpiece, reaches an end position lying within the clamping jaw, so that the workpiece then lies against the clamping surface.
  • a preferred embodiment provides that the pull-down element is inserted into a receiving slot which runs obliquely to the workpiece support and extends longitudinally at least over a portion of the clamping jaw and is open towards the clamping surface and which faces away from the clamping surface as a bearing and holder for the pull-down element is formed and has an extension for the pivoting movement of the pull-down element in the vicinity of the clamping surface.
  • the pull-down element can be inserted into such a receiving slot in a simple manner and, due to this accommodation, is not disruptive even in the usual handling of the clamping device.
  • the pull-down element is preferably formed by at least one leaf spring, which is preferably designed as a flat flat part. Such a pull-down element is particularly easy to manufacture.
  • the receiving slot for the pull-down element in the clamping jaw has a curve arched to the clamping surface at least of its slot wall remote from the support and has an exit direction pointing obliquely to the workpiece support.
  • This curvature of the receiving slot makes the flat one in a relaxed position or flat leaf spring deformed and preloaded, so that it rests accordingly at least in the vicinity of the clamping surface on this bulge outside.
  • the leaf spring thus assumes its initial position automatically when not under load and is at the same time jammed in the slot by the deformation and thus held.
  • pull-down devices are provided on both clamping jaws, possibly also on partial jaws belonging to a clamping jaw.
  • the workpiece is pressurized to the support on both clamping surfaces and is thus precisely positioned.
  • a further development of the invention provides that the intended clamping movement of the clamping jaws is somewhat larger than the adjusting movement of the pull-down element and that, in the case of the adjustable clamping jaws, a delivery device for displacing the clamping jaw (s) on the workpiece and preferably combined with the delivery device Clamping device provided for the clamping movement.
  • the adjustable clamping jaw (s) can be fed up to the workpiece and only then will the pull-down device for positioning on the workpiece support be activated during clamping.
  • the base plate expediently has coordinate bores for fastening fixed clamping jaws or similar stops and / or for connecting to a base clamping plate or a machine tool table.
  • the clamping device can thus be used overall in the manner of a pallet plate or an interchangeable plate, the existing coordinate bores being used for exact positioning when moving this base plate or pallet plate. Overall, this will also result in the clamping of the workpiece in the clamping device maintain targetable positioning accuracy.
  • a clamping device 1 shown in the figures is used to hold workpieces 2. These are held between two clamping jaws 3 which are adjustable in their relative distance from one another. It is preferably provided that one of the clamping jaws is designed as a fixed jaw and the other as a movable jaw.
  • the clamping jaws 3 have clamping surfaces 4 pointing towards one another and in the exemplary embodiment, workpiece supports 5 connected in one piece are also provided.
  • a pull-down device 6 is provided at least on one of the clamping surfaces. This pull-down device 6 is actuated by this workpiece when the workpiece is clamped between the two clamping jaws 3, it being pulled against the workpiece support 5 by a pull-down component derived from the clamping movement.
  • the pull-down device 6 has a pull-down element 7 which projects beyond the clamping surface 4.
  • this pull-down element 7 is formed by a leaf spring 9, which is resilient in the pull-down direction (see arrow Pf 1 in Fig. 1) and with its rake face end points obliquely towards the workpiece support 5. Without the workpiece 2 lying thereon (FIG. 1), the end 23 on the rake face protrudes beyond the rake face 4, whereby this projection can be a few tenths of a millimeter, for example 2/10 millimeters.
  • the leaf spring 9 is in the embodiment in an inclined to the workpiece support 5 and out longitudinally at least over a portion of the clamping jaw 3 extending receiving slot 10 is used, which has an outlet opening in the clamping surface 4. It is preferably provided that this receiving slot 10 has a curve curved to the clamping surface 4, as can be clearly seen in FIGS. 1 to 4. Starting from the inner end of the receiving slot 10, its slot walls 13, 13a run parallel and form a clamping bracket for the leaf spring 9 in this area, which extends over approximately half the depth of the receiving slot 10.
  • the lower or the support-side diaphragm wall 13a has a greater distance from the other diaphragm wall 13 in the region located further outside, this distance being dimensioned such that a free space 8 for pivoting the outer end of the leaf spring 9 into that shown in FIG. 4 Position is present.
  • the leaf spring 9 is preferably designed as a flat flat part in a relaxed position, which is preloaded accordingly after insertion into the curved receiving slot 10. In this pretension position, the leaf spring 9 rests on the diaphragm wall 13 and the outer end 23 protrudes beyond the clamping surface 4.
  • the slot base 24 forms a displacement stop, so that the leaf spring 9 cannot be moved longitudinally when it is acted upon by the workpiece 2 according to the arrow Pf 2 in FIG. 3. Therefore, due to the oblique arrangement of the spring end, there is a pivoting movement toward the workpiece support 5, the pivot radius intersecting the support-side clamping surface section below the pull-down element 7 which is in the rest position.
  • the leaf spring 9 is biased by the curved course of the slot 10, so that its outer end 23 assumes the position shown in FIG. 3 without external stress. At the same time, the leaf spring 9 is also clamped in the slot 10 and is therefore also held in a simple manner.
  • This holder has the further advantage that leaf springs 9 of different thicknesses can be used and are held sufficiently. In Fig. 3, a thinner spring is shown in dashed lines. This makes it possible for different leaf springs or the like. Pull-down elements to be used depending on the desired pull-down force.
  • the lamellar leaf spring 9 can have a thickness of approximately 0.1 mm to approximately 1 mm in the case of smaller clamping devices, a leaf spring with a thickness of 0.2 mm being used in an experimental setup.
  • the thickness of the leaf spring or the like can also be several, for example 2, 3, 4 or 5 mm.
  • the spring force can also be influenced by the free projection of the spring protruding over the clamping length.
  • the stroke in the pull-down direction also results.
  • a pull-down stroke of approximately 2/10 to 3/10 millimeters would result from a protrusion of approximately 2/10 millimeters.
  • the pull-down stroke of the supernatant could be increased accordingly.
  • the leaf spring 9 can extend over the entire length of a clamping jaw 3, one of its longitudinal edges projecting beyond the clamping surface 4 as the outer end 23. It is expedient if the receiving slot 10 is formed open at the edges at its lateral ends, so that the leaf spring 9 can then also be used from these sides. On the other hand, this leaf spring can also be inserted into the slot 10 from the clamping surface 4. There is also the possibility that several pull-down elements 7 are arranged in series in the longitudinal direction of the clamping jaw 3.
  • the pull-down device 6 can be arranged both on the fixed and on the movable clamping jaw. It is preferably provided that such pull-down devices 6 are provided on both jaws.
  • FIG. 6 shows a clamping device in which a fixed, longitudinally continuous clamping jaw 3 and on the opposite side a movable clamping jaw formed from several partial clamping jaws 3a, 3b are provided. It can also be seen here that these partial clamping jaws can be designed differently not only in their longitudinal extent, but also in their clamping distance, in order to be able to clamp workpieces provided with recesses accordingly.
  • the partial clamping jaws 3a, 3b can each be provided with pull-down devices 6.
  • clamping devices 1 are shown, in which the actual clamping movement of the clamping jaws 3 is matched to the adjusting movement of the pull-down element or elements 7.
  • the clamping movement of the clamping jaws is somewhat larger than the adjusting movement of the pull-down element.
  • the clamping devices 1 have a combined feed and clamping device 14 for the movable clamping jaws 3.
  • the movable jaws 3 can be moved up to the workpiece, this workpiece then resting on the pull-down elements 7 of the jaws 3.
  • the subsequent clamping process then causes only a very small adjustment path of the clamping jaws, within which the pull-down movement of the leaf springs 9 or the like also takes place.
  • the feed and clamping device 14 has clamping screws 15 (see FIGS. 5 and 7) which engage on the movable clamping jaws, which reach through the movable clamping jaws and pass through slits 16 extending obliquely in the clamping direction in a base plate 17 belonging to the clamping device 1 and on the back thereof
  • Base plate 17 are screwed into longitudinally adjustable locking blocks 18.
  • locking blocks 18 locking fields formed by a locking profile 21 are provided on the underside of the base plate 17 along the sliding slots 16.
  • the locking blocks 18 have a corresponding counter-profile on their side facing the base plate 17, which engages in the locking profile 21 on the base plate 17.
  • the clamping screws 15 can be loosened to such an extent that the locking profiling disengages, so that the locking blocks can then be adjusted along the sliding slots 16. If the actual clamping position is reached with this rough adjustment, for example with the clamping jaws resting on the workpiece, the clamping screws 15 are tightened, the locking blocks 18 are fixed by engagement with the locking profile 21 and the clamping displacement of the movable clamping jaws 3 then takes place by further tightening of the clamping screws.
  • This displacement path is comparatively small and, depending on the division of the latching profile 21, can be dimensioned according to this division distance or less. For example, clamping paths of 0.5 to 2 mm can be provided.
  • the oblique through holes for the clamping screws 15 located in the movable jaws are so be Measure that the clamping screws have a certain amount of play due to their tilting, as they are slightly inclined when clamping the jaws.
  • spherical washers are placed under the head. Because of this slight inclination, the locking profile 21 and the corresponding counter-profile of the locking blocks 18 are expediently formed with rounded flanks in order to keep transverse forces which are otherwise transmitted to the tensioning screws away during the tilting movement.
  • a workpiece 2 is clamped in FIG. 5 and, for clarification, the movable clamping jaw is also indicated in another displacement position. It can also be clearly seen in this figure that the workpiece 2 rests on supports 5 which are integrally connected to the clamping jaws 3. These conditions are formed here by corresponding projections below the clamping surfaces 4.
  • a depression 19 (FIGS. 5 and 7) is provided in the area of the locking profiles 21, the depth of which is dimensioned for receiving the locking blocks 18.
  • 17 fitting bores 22 are provided in this fixed jaw and in the base plate, into which pins or preferably expansion mandrels can be inserted. Through this, an exact position of the fixed jaw is first achieved. This position is then secured by retaining screws 26.
  • the base plate 17 (FIG. 6) has fastening points for two positions of the fixed clamping jaw 3. If necessary, attachment points can also be provided for more different positions of the clamping jaw 3.
  • FIG. 7 and 8 show a somewhat modified holder for the fixed jaw 3, wherein here instead of fitting bores 22 in the base plate 17 grooves 27 for different positions of the fixed jaw 3 and on this corresponding longitudinal springs 28 for engaging in the groove 27 are provided.
  • the clamping jaw 3 is fastened with retaining screws 26.
  • a longitudinal stop is also indicated in FIGS. 5 and 6, which on the foot side has a guide projection which engages under the support projection of the clamping jaw 3 and is therefore already well held in its respective position.
  • the clamping jaw 3 has a series of threaded holes below its clamping surface 4, into which fastening screws 30 of the longitudinal stop 29 can be screwed.
  • the longitudinal stop can thus be attached at virtually any position along the fixed jaw 3. It also has an adjusting screw 31 for fine adjustment of the longitudinal stop position.
  • Fig. 7 shows a modified embodiment of a pull-down device 6a, in which the pull-down element 7a is formed by a part of the clamping jaw 3, which protrudes slightly above the clamping surface 4 and by an oblique longitudinal slot, which is open at the edge towards the clamping surface 4, in regions thereof remaining jaw body is separated.
  • the pull-down device 6 or 6a according to the invention can also be implemented in various other embodiments, wherein the pull-down element can also be attached to a swivel joint, which on the other hand is connected to the jaw body.
  • a machine tool table or other base e.g. also a base clamping plate 25 (see FIG. 7) of a pallet system
  • 17 coordinate bores 20 are provided in the base plate.
  • These coordinate bores which correspond to corresponding bores in a base plate 25 or a machine table, enable precise positioning and holding via expansion mandrels.
  • the clamping device can thus be quickly and precisely connected to a corresponding base.
  • stepped pins it is also possible to fix the position of the clamping device 1 in the T-slots of a processing machine.
  • the clamping device 1 can generally be used to hold workpieces during machining. Because of the high positioning accuracy and also repeatability, use in the production of mold plates, mold cores and the like, ejector plates, eroding electrodes, etc. is particularly possible.
  • the pull-down device 6 can also be mounted in a separate jaw part, which can also be retrofitted to the existing clamping jaws.
  • FIG. 5 also shows a pressure piece 32 which presses the tensioning screw 15 laterally approximately in the feed direction of the movable clamping jaw, through which the tensioning screw rests on one side in the loosened position against the through hole.
  • the maximum span way can be comparatively small and thus the tilting movement can be kept within limits. If the movable clamping jaw is moved up to the workpiece to be clamped, the pull-down path of the pull-down device (s) 6 and then the actual clamping path must be bridged from this position. For this, the comparatively small span of the tensioning device 14 must be sufficient.
  • the tensioning screw and also the locking block 18 connected therewith take up the position lying furthest forward in the tensioning direction before the tensioning process, so that the full tensioning path is subsequently available.
  • the pressure piece has an external thread with which it can be screwed into a threaded bore 33 in the movable clamping jaw 3. At its end facing the tensioning screw 15, a spring-loaded pressure pin 34 protrudes from the pressure piece 32.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jigs For Machine Tools (AREA)
EP89118202A 1988-10-04 1989-09-30 Dispositif de fixation Expired - Lifetime EP0362753B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3833742A DE3833742A1 (de) 1988-10-04 1988-10-04 Einspannvorrichtung
DE3833742 1988-10-04

Publications (2)

Publication Number Publication Date
EP0362753A1 true EP0362753A1 (fr) 1990-04-11
EP0362753B1 EP0362753B1 (fr) 1993-06-09

Family

ID=6364360

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89118202A Expired - Lifetime EP0362753B1 (fr) 1988-10-04 1989-09-30 Dispositif de fixation

Country Status (2)

Country Link
EP (1) EP0362753B1 (fr)
DE (2) DE3833742A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0641623A1 (fr) * 1993-09-01 1995-03-08 Manfred Schanz Dispositif de serrage pour tenir des pièces
EP1762339A1 (fr) 2005-09-07 2007-03-14 System 3R International AB Mâchoire de serrage déformable pour un étau

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5019129A (en) * 1990-07-18 1991-05-28 Lars Johanson Workpiece holding system
DE10345629B4 (de) * 2003-09-29 2007-11-08 Wimmer Gmbh Vorrichtung zum Einspannen eines nicht-elastischen Bauteils
DE102015103531B3 (de) * 2015-03-11 2016-08-04 Helmholtz-Zentrum Berlin Für Materialien Und Energie Gmbh Niederhaltespanner
DE102017121286C5 (de) 2017-09-14 2023-06-22 Schunk Gmbh & Co. Kg Spann- Und Greiftechnik Spannbacke
CN107639184B (zh) * 2017-10-27 2024-01-16 昆山迈征自动化科技有限公司 一种线缆剪切装置
CN114800403B (zh) * 2022-03-15 2024-06-21 安徽荣盛精密科技有限责任公司 一种精密零配件加工用装夹装置
DE102022109309B3 (de) 2022-04-14 2023-05-04 Rüdiger Schenke Niederzugspanner

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2728251A (en) * 1954-06-08 1955-12-27 Sheffield Twist Drill & Steel Improved vise having jaws movable downwardly when clamping a workpiece
DE1301765B (de) * 1966-02-11 1969-08-21 Gressel Ag Aadorf Tiefspannbacke fuer Schraubstoecke
DE2227917A1 (de) * 1972-06-08 1973-12-20 Alexander Rudolf Winkler Parallelschraubstock mit klemmvorrichtung
EP0052379A2 (fr) * 1980-11-19 1982-05-26 Gerhard Arnold Dispositif de serrage, notamment étau

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2411059A (en) * 1944-12-26 1946-11-12 Rubenstein Charles Work hold-down device
DE843341C (de) * 1947-03-24 1952-07-07 Walter Haas Spannvorrichtung zum Festhalten von Werkstuecken
DE821178C (de) * 1949-12-02 1951-11-15 Bernhard Nienkemper Spannbacken fuer Schraubstoecke und Werkzeugmaschinen
CH283847A (de) * 1950-08-17 1952-06-30 Schenk Max Maschinen-Parallelschraubstock
US2760535A (en) * 1952-09-08 1956-08-28 Mertz David Threaded stud and nut actuated quick-set clamp
US2806411A (en) * 1956-08-31 1957-09-17 William O Backman Hold-down unit for clamping devices
DE1283169B (de) * 1964-09-25 1968-11-14 Franz Arnold Maschinenschraubstock mit Tiefspannbacken
DE2447243B2 (de) * 1974-10-03 1976-11-25 Prewo, Willi, 7126 Sersheim Niederzug-werkstueckspannvorrichtung, insbesondere niederzug-maschinenschraubstock

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2728251A (en) * 1954-06-08 1955-12-27 Sheffield Twist Drill & Steel Improved vise having jaws movable downwardly when clamping a workpiece
DE1301765B (de) * 1966-02-11 1969-08-21 Gressel Ag Aadorf Tiefspannbacke fuer Schraubstoecke
DE2227917A1 (de) * 1972-06-08 1973-12-20 Alexander Rudolf Winkler Parallelschraubstock mit klemmvorrichtung
EP0052379A2 (fr) * 1980-11-19 1982-05-26 Gerhard Arnold Dispositif de serrage, notamment étau

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0641623A1 (fr) * 1993-09-01 1995-03-08 Manfred Schanz Dispositif de serrage pour tenir des pièces
EP1762339A1 (fr) 2005-09-07 2007-03-14 System 3R International AB Mâchoire de serrage déformable pour un étau

Also Published As

Publication number Publication date
DE3833742A1 (de) 1990-04-05
EP0362753B1 (fr) 1993-06-09
DE58904620D1 (de) 1993-07-15

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