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WO2020053041A1 - Crampon plaqueur - Google Patents

Crampon plaqueur Download PDF

Info

Publication number
WO2020053041A1
WO2020053041A1 PCT/EP2019/073532 EP2019073532W WO2020053041A1 WO 2020053041 A1 WO2020053041 A1 WO 2020053041A1 EP 2019073532 W EP2019073532 W EP 2019073532W WO 2020053041 A1 WO2020053041 A1 WO 2020053041A1
Authority
WO
WIPO (PCT)
Prior art keywords
clamping
workpiece
pull
support element
workpiece support
Prior art date
Application number
PCT/EP2019/073532
Other languages
German (de)
English (en)
Inventor
Rüdiger Schenke
Original Assignee
Rüdiger Schenke
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 Rüdiger Schenke filed Critical Rüdiger Schenke
Publication of WO2020053041A1 publication Critical patent/WO2020053041A1/fr

Links

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
    • B25B1/06—Arrangements for positively actuating jaws
    • B25B1/10—Arrangements for positively actuating jaws using screws
    • B25B1/103—Arrangements for positively actuating jaws using screws with one screw perpendicular to the jaw faces, e.g. a differential or telescopic screw
    • 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
    • B25B1/02—Vices with sliding jaws
    • 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
    • B25B1/04—Vices with pivoted jaws
    • 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
    • B25B1/06—Arrangements for positively actuating jaws
    • B25B1/18—Arrangements for positively actuating jaws motor driven, e.g. with fluid drive, with or without provision for manual actuation
    • 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
    • B25B1/2431—Construction of the jaws the whole jaw being pivotable around an axis perpendicular to the actioning direction of the vice
    • B25B1/2447—Construction of the jaws the whole jaw being pivotable around an axis perpendicular to the actioning direction of the vice to put one of the jaw faces in a position opposite to the second jaw
    • 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
    • B25B1/2457—Construction of the jaws with auxiliary attachments
    • B25B1/2463—Supports for the workpiece
    • 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 present invention relates to a pull-down clamp, in particular for clamping workpieces for processing by means of 5-axis milling machines or more generally 5-axis processing machines.
  • a pull-down clamp in contrast to the machining of raw workpieces, it is necessary, particularly when machining already partially manufactured workpieces, to clamp them in a precisely defined position in order to comply with the usually very tight manufacturing tolerances.
  • Workpieces clamped in clamps tend to be lifted away from the clamping base or from the base body when the clamping force of up to 40kN and more is applied. This stroke movement can be several hundredths of a millimeter.
  • the reason for this movement is a slight misalignment of the side flanks of the workpiece parallel to the jaw, so that the clamping force leads to different contact forces on the jaws and thus to considerable torque and tilting.
  • Another cause can be the distance between the parallel planes of the spindle serving to introduce the clamping force and the clamping, which lead to a lifting of the workpiece.
  • pull-down jaws are used to pull the workpiece to be machined in the direction of the base body when the clamping force is applied.
  • a resulting forces that are introduced from the workpiece are particularly effectively diverted in the direction of a support plate
  • Machine table or a base plate with at least one clamping jaw having three movable components
  • introduced force are at least partially decomposed into force direction components.
  • This device has the disadvantage of a complex construction of the clamping and support jaws as well as increased signs of wear occurring on rollers and springs.
  • DE 20 44 065 A is a two-part pull-down jaw for
  • the clamping jaw and jaw holder have bevelled, mutually facing contact surfaces.
  • the clamping jaw only receives one via the relatively rigid connection of the two jaws by means of a screw and their attachment to the base body comparatively little game, with which only a correspondingly low pull-down effect can be achieved.
  • the intended compression of the clamping jaw can also lead to signs of fatigue in the material and thus to failure of the device. From DE 545 966 A a vice with pull-down effect is known, with outer vice blocks and a depressing one
  • Tilting press jaws are provided, for which purpose rolling elements or rods are arranged between the blocks.
  • the disadvantage of this device is the increased wear on the rolling elements, the complex structure and the incomplete pull-down effect.
  • the object of the invention is therefore to provide a pull-down clamp that derives the resulting forces even more effectively and is easy to use.
  • This task is carried out in a pull-down clamp having a base body and at least two arranged on the base body
  • the base body having an upper side facing the clamping blocks
  • the pull-down clamp further comprising a spindle acting between the clamping blocks for changing a distance between the clamping blocks, at least one
  • Clamping block has a clamping element arranged on the base body and a workpiece support element articulated thereon, the clamping element acting on the workpiece support element, the spindle being fastened to the clamping element and the workpiece support element being penetrating, the workpiece support element having a clamping section which can be rotated relative to the base body in an area furthest from the base body has a clamping surface directed towards and contacted by the clamping element and one of the
  • Has clamping surface opposite workpiece contact surface wherein a clamping force in the case of use only acts on the workpiece contacted by the workpiece support element, in that the workpiece contact surface and the clamping surface are not formed parallel to one another and an axis of rotation of the clamping section is arranged perpendicular to the workpiece support element and below a workpiece contact line.
  • the tensioning element is applied to the tensioning surface
  • Clamping force initially causes a rotation of the clamping section along an axis of rotation, which is transverse to the longitudinal axis of the main body and below a workpiece contact line, whereby the clamping force receives a force component in the direction of the top, in particular in the direction of the top normal. Due to the non-parallelism of the clamping surface and the contacting part
  • the workpiece contact surface is not orthogonal to the top. This makes the
  • the clamping surface is also not orthogonal to the upper side, which enables more effective force dissipation in the direction of the base body.
  • Workpiece support element has a weakening, so that a
  • Clamping section is greater than a material thickness in one
  • the axis of rotation of the clamping section is thus arranged within the weakened area with a smaller width.
  • the workpiece contact surface and clamping surface are each arranged at angles a and ⁇ greater than 0 ° to a top normal, with ⁇ being greater than a and with a maximum angle difference ⁇ -a being selected such that one of these corresponding change in length of the clamping section is reversible.
  • This allows a partial derivation of the clamping force in the direction of the body.
  • the maximum angle difference ß - a corresponding to the deformation within the elastic limits enables reversible usability.
  • a smaller angle difference delays material fatigue, which means that the
  • the angle a is selected between 0.5 ° and 5 ° between 1 ° and 4 °, preferably between 2.5 ° and 3.5 °, so that the
  • Clamping section is given. It is also provided in an embodiment of the invention that the angle ⁇ is chosen between 1 ° and 10 °, in particular between 2 ° and 8 °, preferably between 3 ° and 5 °. As a result, the successive tilting of the clamping section and clamping surface is particularly effective and enables a particularly large pull-down effect. According to another embodiment of the invention, it is provided that the workpiece contact surface has a second angle g to
  • the kink line is arranged above a workpiece contact line. This very advantageously enables an effective tilting of the over the
  • Base body is the most distant area contacting.
  • a lever arm acting in the basic body direction is enlarged. It is also ensured that the clamping section is not deformed above the clamping surface.
  • the invention provides in a further development that a vertical extension of the clamping surface is larger than a further vertical extension of the part of the clamping element that contacts the clamping surface. A lever arm thus extended to an axis of rotation of the clamping surface facilitates the rotation of the clamping surface when the clamping force is introduced.
  • the clamping section is an independent component which is attached to a part of the workpiece support element on the basic body side. This very advantageously facilitates the manufacture of a pull-down tensioning device according to the invention.
  • FIG. 1 a pull-down tensioning device according to the invention schematically in FIG.
  • Fig. 2 a section of another invention
  • Fig. 1 shows a pull-down clamp 1 according to the invention with a preloaded workpiece 17 schematically in side view.
  • a base body 2 On a base body 2, two mutually spaced clamping blocks 3 are attached to the top 4 thereof, each having a workpiece support element 6 and a clamping element 7. It is the respective one
  • Workpiece support element 6 is displaceably arranged on the base body 2, with a clamping element 7 in the part 19 of the base body
  • Workpiece support elements 6 are each one Supporting element 15 is supported and fixed in the clamping operation on the base body 2.
  • the support elements 15 further facilitate setting a workpiece width for prestressing a workpiece 17.
  • the clamping elements 7 indirectly introduce a clamping force into the workpiece 17, as will be described further below.
  • a spindle 5 with which a distance of the clamping blocks 3 from one another can be set, is attached in such a way that it passes through the workpiece support elements 6 and is fastened to the clamping elements 7.
  • the clamping elements 7 are articulated on the respective workpiece support element 6 such that when a clamping force is introduced by operating the spindle 5, the clamping element 7 is movable relative to the workpiece support element 6 on which it is articulated. As a result, the elasticity of the
  • Workpiece support element 6 is each a vertically extending clamping section 12. This is contacted by the articulated clamping element 7 on a clamping surface 8. In the biased state of the workpiece 17 shown, this contact is in particular line-like.
  • the clamping section 12 has a workpiece contact surface 9 on a side opposite the clamping surface 8.
  • a clamping force on a clamped workpiece 17 is only when using the pull-down clamp 1 according to the invention
  • Workpiece contact surfaces 9 can be introduced. Workpiece contact surface 9 and clamping surface 8 are not parallel to one another in a pull-down clamp 1 according to the invention. In particular, workpiece contact surface 9 and clamping surface 8 are each not orthogonal to the upper side 4. In the particularly advantageous embodiment shown, one of an upper side normal 18 and the workpiece contact surface 9
  • clamping section 12 When clamping force 7 is introduced onto clamping section 12, clamping section 12 is rotated relative to workpiece 17.
  • the axis of rotation 21 is perpendicular to both a longitudinal axis of the base body 2 and to the top normal 18 and lies within a weakening 20 of the width of the workpiece support element 6.
  • the force acting on the workpiece 17 from the workpiece contact surface 9 is due to the rotation in a parallel, directed in the direction of the originally introduced clamping force and divided into a vertical component directed in the direction of the upper side 4.
  • the component is causing a first pull-down effect on the workpiece 17. Due to the rotation, the angle a is between
  • Workpiece contact surface 9 and surface normal 18 minimized - workpiece contact surface 9 and surface normal 18 are parallel to one another.
  • the workpiece support element 6 is deformed by the rotation of the clamping section 12 in the region of the axis of rotation 21. This deformation is due to the weakened width in this area
  • the angle ⁇ between the clamping surface 8 and the surface normal 18 is greater than 0 ° even after the rotation - the angle difference ⁇ -a is unchanged. With further clamping force is the
  • Clamping force can now only be derived by deforming the clamping section 12, that is, by tilting the clamping surface 8 relative to the surface normal 18 and to the workpiece contact surface 9.
  • the additionally introduced clamping force is again divided into orthogonal components parallel to the surface normal 18, which
  • a support plate 16 is arranged on the workpiece support element 6, on which a workpiece 17 rests when in use.
  • Fig. 2 shows a detail of a further embodiment of a pull-down tensioning device according to the invention in a perspective view.
  • a workpiece support surface 9 is formed kinked along a kink line 10, so that it has two different angles, a and g, to a surface normal 18.
  • a line-like is still clearly recognizable
  • Design of the workpiece contact surface 9, in particular the workpiece contact line 11 lying below the kink line 10, enables an additional pull-down effect on the workpiece 17.
  • the clamping section 12 is first rotated along the axis of rotation 21 with a first radius 22 by the angle g such that the part of the workpiece contact surface 9 closer to the base body is parallel to the workpiece.
  • the clamping section is rotated a second time along the axis of rotation 21 with a second radius 23 by the angle a-g.
  • a part of the workpiece contact surface 9 lying above the kink line 10 is brought into contact with the workpiece 17.
  • the second rotation is accompanied by a deformation of the clamping section 12 along the fold line 10. Both rotations have a pull-down effect on the workpiece 17.
  • the further pull-down effect due to the tilting of a clamping surface 8 as a result of further deformation of the clamping section 12 then follows when a clamping force 5 is introduced by adjusting a spindle 5.
  • a clamping force 5 is introduced by adjusting a spindle 5.
  • the illustrated embodiment of the invention is a vertical one
  • Extension 13 of the clamping surface 8 is greater than a further vertical extension 14 of the part of the clamping element 7 contacting the clamping surface 8. As a result, a lever arm for tilting the clamping surface 8 is extended, which facilitates the tilting. Furthermore, the embodiment shown with the tapered part of the clamping section 12 lying above the kink line 10 enables better elasticity of the clamping section 12 and the associated better rotatability with the second radius 23.

Landscapes

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

Abstract

La présente invention concerne un crampon plaqueur, en particulier pour le serrage de pièces à usiner, lequel permet une amélioration de la décharge des forces générées ainsi qu'une manipulation plus facile. Un crampon plaqueur selon l'invention, comprenant un corps de base et au moins deux blocs de serrage disposés sur le corps de base, le corps de base comprenant une face supérieure faisant face aux blocs de serrage, le crampon plaqueur comprenant en outre une broche agissant entre les blocs de serrage pour une modification de la distance entre les blocs de serrage, au moins un bloc de serrage comprenant un élément de serrage disposé sur le corps de base et un élément d'appui de pièce à usiner monté en pivotement sur l'élément de serrage, l'élément de serrage agissant sur l'élément de support de pièce à usiner, la broche étant fixée sur l'élément de serrage et traversant l'élément de support de pièce à usiner, l'élément de support de pièce à usiner comprenant dans une zone la plus éloignée du corps de base une section de serrage pouvant être tournée contre le corps de base, laquelle comprend une surface de serrage faisant face à l'élément de serrage et mise en contact avec celui-ci et une surface de contact de pièce à usiner faisant face à la surface de serrage, une force de serrage en cas d'utilisation n'agissant qu'à travers l'élément de support de pièce à usiner sur la pièce à usiner mise en contact avec celui-ci, résout cette tâche en ce que la surface de contact de pièce à usiner et la surface de serrage ne sont pas réalisées parallèles l'une à l'autre et qu'un axe de rotation de la section de serrage est disposé perpendiculairement à l'élément de support de pièce à usiner et en dessous d'une ligne de contact de pièce à usiner.
PCT/EP2019/073532 2018-09-10 2019-09-04 Crampon plaqueur WO2020053041A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018122045.6A DE102018122045B3 (de) 2018-09-10 2018-09-10 Niederzugspanner
DE102018122045.6 2018-09-10

Publications (1)

Publication Number Publication Date
WO2020053041A1 true WO2020053041A1 (fr) 2020-03-19

Family

ID=67550675

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/073532 WO2020053041A1 (fr) 2018-09-10 2019-09-04 Crampon plaqueur

Country Status (2)

Country Link
DE (1) DE102018122045B3 (fr)
WO (1) WO2020053041A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022109309B3 (de) 2022-04-14 2023-05-04 Rüdiger Schenke Niederzugspanner
DE102022109332B3 (de) 2022-04-14 2023-05-17 Rüdiger Schenke Zentrumsspannsystem

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE499040C (de) * 1927-02-06 1930-06-13 Johann Schmidt Maschinen-Parallelschraubstock mit niederziehenden Spannbacken
DE545966C (de) 1929-05-16 1932-03-10 Bruno Friedrich Parallelschraubstock
DE2044065A1 (de) 1970-09-05 1972-03-23 Maschinenfabrik Hüma GmbH, 5912 Hilchenbach Zweiteilige Niederziehbacke fur Schraubstocke oder dergleichen
DE4133537A1 (de) 1991-10-10 1993-04-15 Guenter Meywald Spannvorrichtung fuer insbesondere spanabnehmend zu bearbeitende werkstuecke
DE202005018193U1 (de) * 2005-02-02 2006-08-03 Schenke, Rüdiger, Dipl.-Ing. (FH) Spannvorrichtung
DE102009009921A1 (de) 2009-02-24 2010-08-26 Rüdiger Schenke Niederzugspannbacken
DE102013103913A1 (de) * 2013-04-18 2014-10-23 Rüdiger Schenke Spanner

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE499040C (de) * 1927-02-06 1930-06-13 Johann Schmidt Maschinen-Parallelschraubstock mit niederziehenden Spannbacken
DE545966C (de) 1929-05-16 1932-03-10 Bruno Friedrich Parallelschraubstock
DE2044065A1 (de) 1970-09-05 1972-03-23 Maschinenfabrik Hüma GmbH, 5912 Hilchenbach Zweiteilige Niederziehbacke fur Schraubstocke oder dergleichen
DE4133537A1 (de) 1991-10-10 1993-04-15 Guenter Meywald Spannvorrichtung fuer insbesondere spanabnehmend zu bearbeitende werkstuecke
DE202005018193U1 (de) * 2005-02-02 2006-08-03 Schenke, Rüdiger, Dipl.-Ing. (FH) Spannvorrichtung
DE102009009921A1 (de) 2009-02-24 2010-08-26 Rüdiger Schenke Niederzugspannbacken
DE102013103913A1 (de) * 2013-04-18 2014-10-23 Rüdiger Schenke Spanner

Also Published As

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DE102018122045B3 (de) 2019-08-29

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