EP1987923B1 - Couche à perméabilité à l'air limitée pour un dispositif de positionnement de pièces à usiner - Google Patents

Couche à perméabilité à l'air limitée pour un dispositif de positionnement de pièces à usiner Download PDF

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Publication number
EP1987923B1
EP1987923B1 EP20080007947 EP08007947A EP1987923B1 EP 1987923 B1 EP1987923 B1 EP 1987923B1 EP 20080007947 EP20080007947 EP 20080007947 EP 08007947 A EP08007947 A EP 08007947A EP 1987923 B1 EP1987923 B1 EP 1987923B1
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EP
European Patent Office
Prior art keywords
layer
air permeability
limited air
sealing strips
workpiece
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EP20080007947
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German (de)
English (en)
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EP1987923A3 (fr
EP1987923A2 (fr
Inventor
Monika Reck
Matthias Reck
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.)
Datron AG
Original Assignee
Datron AG
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Priority claimed from DE102007031579A external-priority patent/DE102007031579A1/de
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Publication of EP1987923A2 publication Critical patent/EP1987923A2/fr
Publication of EP1987923A3 publication Critical patent/EP1987923A3/fr
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Publication of EP1987923B1 publication Critical patent/EP1987923B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
    • B25B11/005—Vacuum work holders

Definitions

  • the invention relates to a limited air-permeable layer for a device for positioning and fastening of workpieces to be machined according to the preamble of claim 1.
  • a limited air-permeable layer for a device for positioning workpieces goes out of the US 3,335,994 out.
  • this layer is disadvantageous in that it is porous and thus in each direction, that is formed substantially equally permeable to air both perpendicular to the surface and in the plane of the layer. For this reason, the sealing elements must be injected into the pores. By such a production of the sealing elements a complete seal can be ensured by the sealing elements only with great effort.
  • a jig protrudes with a plate in which channels are arranged, which are connected via connections to a plurality of vacuum chambers.
  • sealing elements On the surface of the plate are sealing elements arranged in the form of sealing strips which form a plurality of respective closed, sealed suction regions between the workpiece and the base plate.
  • the plate itself is made of aluminum or a stainless steel or other suitable solid material in a non-porous form.
  • Such a device is also from the DE 201 17 390 U1 as well as from the DE 103 57 268 B3 known.
  • the DE 40 30 113 A1 also proposes pretreating the filter paper with an adhesive or with an adhesive.
  • This spray adhesives are used, which are applied flat. This surface application of the spray adhesive is associated with high costs. In addition, there is an additional chemical burden.
  • the pretreated filter paper is also difficult to handle.
  • the invention is therefore an object of the invention to eliminate the aforementioned disadvantages and to provide a limited air-permeable layer that is easy to produce on the one hand and on the other hand easy to handle and even for small workpieces and workpieces with rough surface a very good positioning and a very good holding of the workpiece on the base plate by the vacuum allows.
  • the basic idea of the invention is, as it were, to form a plurality of juxtaposed suction cups by the plurality of sealing elements which each form a closed, sealed suction region, which in conjunction with the carrier material, which due to its design enables maximum flowability perpendicular to the base plate, substantially increases the holding forces of the workpiece Even if the milling head partially damaged the limited air-permeable layer, for example, when milling out openings having workpieces or when milling the workpiece edges. In this case, so to speak, the other closed and sealed suction areas or suction cups take over the holding of the workpiece.
  • the limited air-permeable layer is advantageously formed by an applied to the top of the base plate formed by the carrier sheet or by a plate on which at least a surface, the sealing elements are attached.
  • This sheet / plate can, as will be explained in more detail below, be formed from a variety of materials.
  • the carrier material is designed so that a maximum flow-through perpendicular to the base plate.
  • This can be realized by a variety of materials.
  • filter paper may be formed.
  • the sheet has only a small thickness of about 0.5 mm to 2 mm.
  • the sheet can also be formed by a likewise thin so-called skin board or by an MDF or HDF board, so a medium density fiberboard or a high density fiberboard, which are porous.
  • sealing elements themselves are preferably raised sealing strips, which can also be referred to as sealing walls. These sealing strips or sealing walls allow a high surface pressure and thus a particularly optimal seal.
  • the sealing strips are elastically formed. They adapt to such small bumps of the workpiece to be machined and / or the base plate and increase in this way the sealing effect significantly.
  • a particularly advantageous embodiment provides that these sealing strips have a sticky nature. As a result, the workpiece is already held by the adhesive effect, whereby in particular a slight positioning is possible.
  • the stickiness of the sealing strips is advantageously adapted to the workpiece to be machined such that after the machining operation, when the workpiece is removed again from the limited air-permeable layer, a residue-free detachment is possible.
  • the tackiness is adjusted so that no adhesive residue adheres to the machined workpiece.
  • the sealing strips are preferably made of an elastic, not vulnerable to cutting oils and coolants adhesive.
  • the sealing strips are in an advantageous embodiment, side by side on the surface of the limited air-permeable layer under example, forming any pattern of stochastically distributed lines that intersect and thus form each suction areas arranged.
  • Another embodiment provides a repeating pattern, such as a checker or a pattern of adjacent circles or a honeycomb pattern.
  • a repeating pattern such as a checker or a pattern of adjacent circles or a honeycomb pattern.
  • Such a pattern has the advantage that it can be adapted to any contours of the workpieces to be machined.
  • the size of the suction areas formed for example by the checks or the honeycomb is advantageously adapted to the size of the workpiece to be machined. For small workpieces to be machined the check pattern is therefore smaller than larger workpieces to be machined.
  • one or more adhesive points to provide within the suction areas, the height of which corresponds to the height of the sealing strip substantially. As a result, a further improved holding of the workpiece is achieved due to the adhesive effect.
  • Another advantageous embodiment which allows processing of juxtaposed workpieces in use, provides that the sealing strips on the surface of the air-permeable limited layer run so that their contour is copied to the workpieces to be machined in each case. If in this case z. B. heart-shaped pattern to be produced, they can be milled by a computer-controlled milling machine side by side from a solid workpiece block. The sealing strips run closed heart-shaped and indeed arranged side by side on the layer that the milled parts are held on the plate after processing. Thus, the sealing strips run just slightly before the edge, which the milling head bypasses during the milling out of the parts, so that they still run within the workpiece to be machined, the contour of which replicates.
  • the height of the sealing strips is advantageously adapted to the surface roughness.
  • a workpiece having a rough surface requires higher sealing strips than a workpiece with a smooth surface.
  • the limited air-permeable layer also has on its side facing away from the workpiece and the base plate side facing at least one sealing element.
  • the sealing element advantageously extends at the edge region of the limited air-permeable layer, ie in the vicinity of the edge region of the sheet or the plate. This gives a particularly optimal effect of holding vacuum.
  • the sealing strips can be applied to the limited air-permeable layer in a variety of ways.
  • the sealing strips are applied by a computer-controlled dispenser, so by a targeted computer-controlled application by means of a movable nozzle on the surface of the air-permeable limited layer .
  • Another possibility is the application of the sealing strips by means of a calender.
  • Yet another possibility is the spraying of hot glue in the form of sealing strips, the spraying of adhesive on stencils or the application of the sealing strips by gravure by means of transfer rollers.
  • the sealing strips are covered in the case of a sticky consistency by a peelable protective layer.
  • This protective layer can be formed for example by a silicone paper or a protective film. Through them a transport of overlying arches is possible.
  • the peelable protective layer is also formed air-impermeable, so that it is caused no weakening of the vacuum in the event that the workpiece does not completely cover the limited air-permeable layer. In this case, for example, the contour of the workpiece is traced by means of a knife and deducted in this area, the protective layer. The workpiece is then placed on this area, being held in an optimal manner due to the suction areas formed by the sealing elements.
  • the rest of the limited air-permeable layer is covered during the processing of the workpiece by the air-impermeable protective layer. In this way it is ensured that the vacuum in the region of the workpiece which is to be held is made high, which is not the case with a limited air-permeable layer which does not carry a protective layer. In this latter case, the vacuum would be weakened.
  • the course of the sealing strips is preferably adapted to the openings in the base plate.
  • the sealing strips may be arranged such that each adjoining corners come to rest precisely above an opening in the base plate, so that these openings are effectively distributed over four suction regions.
  • the invention is not limited to such an arrangement, but it may also be provided that the openings are located within the suction regions. In this case, a plurality of openings can be arranged within the suction regions.
  • a device for positioning and fixing of workpieces to be machined shown in FIG Fig. 1 and Fig. 2 , Has a substantially flat, openings 115 having base plate 110.
  • the openings 115 are connected at their lower side via corresponding channels 116 to a vacuum pump 118, by means of which, in a manner known per se, a vacuum is applied to the upper side of the base plate 110 for holding a workpiece 300, 310, 320, 340 (FIG. Fig. 3 and Fig. 4 ) is possible.
  • the top of the base plate 110 is covered with a limited air-permeable layer 120, which may be formed for example in the form of a paper sheet, in particular a paper sheet of filter paper or the like, or a so-called skin board or MDF or HDF board.
  • This limited air-permeable layer 120 is formed porous. It acts as a throttle and damping of the vacuum and allows a uniformly distributed effect of the vacuum on a workpiece to be positioned and fastened 300, 310, 320, 340 ( Fig. 3 . Fig. 4 ).
  • the limited air-permeable layer 120 consists of a carrier material which is formed so that a maximum flow-through perpendicular to the base plate 110 sets.
  • this limited air-permeable layer prevents the vacuum from collapsing due to the throttling action, since the air flow is limited by the throttling action.
  • sealing strips 140 and 142 are, for example, as in FIG Fig. 1 and Fig. 2 represented, caricatured or arranged in the form of squares so that each intersecting sealing strips 140, 142 form a closed suction region 145.
  • suction areas 145 are next to each other.
  • the sealing strips 140, 142 are on the surface of the layer 120, for example by screen printing technology or by computer-controlled application by means of so-called dispenser or by a calender applied raised sealing walls. Moreover, it is possible to produce the sealing strips by spraying hot glue in the form of the sealing strips, spraying adhesive on a stencil or by gravure by means of transfer rollers.
  • sealing strips need in no case be arranged in a regular order on the limited air-permeable layer. Rather, it is also possible to realize the sealing strips 140, 142 as stochastically distributed lines which intersect and thus form respective closed suction regions.
  • the sealing strips 140, 142 are preferably made of an elastic material, so that they adapt to slight unevenness of the workpiece 300, 310, 320, 340, in particular if this has a rough surface, while achieving an optimal seal.
  • the sealing strips have a sticky consistency.
  • the workpiece 300, 310, 320, 340 to be machined is already held by the tackiness of the sealing strips 140, 142.
  • the stickiness also increases the tightness.
  • further adhesive points 141 may also be provided, as shown schematically in the upper left region of FIG Fig. 2a are shown. These adhesive dots 141 improve the adhesion of the workpiece to the limited air-permeable layer 120 without affecting the effect of the suction regions 145 formed by the sealing strips 140, 142.
  • suction regions 145 ensure that the workpiece 300 (see FIG. Fig. 3 ) is also held securely on the base plate 110 when the milling head (not shown) has damaged the limited air-permeable layer 120 by moving the outer contour. In this case, as in Fig. 3 Although several suction areas 145 "damaged", which means so much that the vacuum has collapsed in these suction areas. In the interior of the workpiece 300, however, suction regions 149 are active and securely hold the workpiece 300 on the base plate 110.
  • the sealing strips 140, 142 which can also be referred to as sealing walls, can be positioned so that in each case one corner of a suction region 145 comes to lie above an opening 115 in the base plate. In this way, the opening 115 acts to a certain extent simultaneously in four juxtaposed suction regions 145.
  • the sealing strips 140, 142 can also run in any other way, for example so that in each case an opening 115 comes to lie in a suction region 145 ( Fig. 1b . 2 B ).
  • sealing strips 140, 142 such that in each case a plurality of openings 115 are arranged within the suction regions 145, as shown schematically in FIG Fig. 2c is shown.
  • the sealing strips 140, 142 and thus the suction regions 145 need not be matched to the openings 115 in order to achieve the effect according to the invention.
  • the sealing strips 140, 142 are preferably formed by an elastic adhesive, which is insensitive to cutting oils and coolants, as used in a milling operation and is not attacked.
  • the sticky sealing strips 140, 142 forming the suction regions 145 are covered by a protective layer 200, which is realized, for example, by a silicone paper or by a film.
  • This silicone paper or the film is easily peelable from the sealing strips 140, 142.
  • the covering by the silicone paper or foil is due to two reasons. On the one hand, transport of superimposed, for example paper sheets, limited air-permeable layers 120 is possible in this way, without the sheets sticking to one another. On the other hand - and this is a very significant effect - is made by the air-impermeable protective layer 200 in the form of silicone paper or film, the vacuum in the suction regions 145, which are not covered by the workpiece 300, not weakened or otherwise negatively affected.
  • Fig. 3 As in Fig. 3 is shown, for example, the contour of a workpiece to be machined 300 to be held on the plate 110, for example, by means of a knife traced.
  • the protective layer 200 is pulled off along a contour 210 formed in this way, so that the workpiece 300 is arranged to a certain extent on the limited air-permeable layer 120.
  • the inner suction areas in Fig. 3
  • the twelve illustrated suction areas 149 in contrast, fully fulfill their purpose, namely the maintenance of holding vacuum and thus the exercise of a high holding power.
  • sealing strips 140, 142 as a raised ramps allow a high surface pressure - compared to the surface application of, for example, adhesives, as known from the prior art. As a result, the sealing effect is further increased significantly.
  • This in Fig. 1 and Fig. 3 illustrated embodiment allows the positioning and arrangement of workpieces 300, 310, 320, 340 with any contour.
  • the square or square arrangement of the sealing strips 140, 142 is in this case adapted to a certain extent from the outset workpieces of any contour, it being noted that the distance between the sealing elements 140 and 142 and thus the size of the checks on the size of the workpieces to be tuned so in that narrower side-by-side sealing elements 140, 142 (smaller checks) are provided for smaller workpieces than for larger workpieces.
  • FIG Fig. 4 Another embodiment, shown in FIG Fig. 4 , provides to adapt the sealing elements of the contour of the workpiece to be machined.
  • a sealing element 146 shown in the form of a circular line.
  • the suction region 146 ' is also circular.
  • the contour of the workpiece 340 to be machined which is held on the plate 110, for example, traced by a knife.
  • the protective layer 200 is then pulled off along the contour 210 "formed in this way, so that the workpiece 340 is arranged almost accurately on the limited air-permeable layer 120.
  • the sealing elements 147 are respectively disposed on the outer edge of the workpiece 310 and the opening 315 and thus form a closed, an opening having a rectangular suction region 147 '.
  • the expected outer contour of the workpiece 310 to be machined is traced by means of a knife, and the protective layer 200 is drawn off along this contour 210 'in order to arrange the workpiece 310 on the limited air-permeable layer 120 practically in this case.
  • a sealing element 148 is provided which follows the contour of the workpiece 320 is substantially and closed, so that a sealing region 148 'is formed, which has like the workpiece 320 has an L-shape.
  • the outer contour of the workpiece 320 is again traveled by means of a knife, for example, and the protective layer 200 along the resulting contour 210 "'of the limited air-permeable layer 120th away.
  • each adapted to the shape of the workpiece to be machined can be made in particular when a plurality of adjacent equally contoured workpieces to a certain extent "in use" to be processed.
  • the course of the sealing elements 146, 147 or 148 and thus the formation of the suction regions 146 'or 147' or 148 ' can be adapted to the coordinates of the milling cutter.
  • Such a design of the sealing elements allows a particularly large suction area and thus a particularly optimal positioning and attachment of the workpieces to be machined on the limited air-permeable layer 120th
  • workpiece-dependent sealing elements 146, 147, 148 can also be produced in this case, for example by screen printing technique or by the other methods described above.
  • one or more adhesive points, within the suction regions 145, 146 ', 147', 148 ' provide, the height of which corresponds to the height of the sealing strip substantially. As a result, a further improved holding of the workpiece is achieved due to the adhesive effect (not shown).
  • the base plate 110 facing surface of the limited air-permeable layer 120 may also be provided on the base plate 110 facing surface of the limited air-permeable layer 120 form one or more the holding vacuum further increasing suction areas.
  • sealing elements 190 extend at the edge region of the sheet which forms the limited air-permeable layer 120.
  • the base plate 110 facing surface of the limited air-permeable layer 120 is first covered with a silicone paper or a protective film.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Labeling Devices (AREA)
  • Laminated Bodies (AREA)
  • Jigs For Machine Tools (AREA)
  • Connection Of Plates (AREA)

Claims (26)

  1. Couche (120) ayant une perméabilité à l'air limitée pour un dispositif de positionnement et de fixation de pièces à usiner (300 ; 310 ; 320 ; 340) sur la face supérieure d'une plaque de base (110) essentiellement plane comprenant des ouvertures (115), ces ouvertures (115) étant en liaison fluidique avec une pompe à vide (118) sur la face inférieure de la plaque de base (110), la couche (120) ayant une perméabilité alors limitée étant située entre la pièce à usiner (300 ; 310 ; 320 ; 340) et la face supérieure de la plaque de base (110), et comportant, au moins sur sa face tournée vers la pièce à usiner des éléments d'étanchéité (140, 142 ; 146 ; 147 ; 148) qui forment entre la pièce à usiner (300 ; 310 ; 320 ; 340) et la plaque de base (110) un ensemble de zones d'aspiration rendues étanches respectivement fermées (145, 146' ; 147' ; 148'),
    caractérisé par
    une feuille en un matériau support appliquée sur la face supérieure de la plaque de base (110) et qui est réalisée de façon à ce qu'il s'établisse une perméabilité maximum perpendiculairement à la plaque de base (110), et sur au moins l'une des faces de laquelle sont fixés les éléments d'étanchéité (140, 142, ; 146 ; 147 ; 148).
  2. Couche (120) ayant une perméabilité à l'air limitée conforme à la revendication 1,
    caractérisée en ce que
    la feuille est en papier, en particulier en papier filtre.
  3. Couche (120) ayant une perméabilité à l'air limitée conforme à la revendication 1,
    caractérisée en ce que
    la feuille est réalisée en carton parcheminé.
  4. Couche (120) ayant une perméabilité à l'air limitée conforme à la revendication 2 ou 3,
    caractérisée en ce que
    la feuille réalisée en papier ou en carton parcheminé a une épaisseur de 0,5 mm à 2 mm.
  5. Couche (120) ayant une perméabilité à l'air limitée conforme à la revendication 1,
    caractérisée en ce que
    la feuille est formée par une plaque MDF ou par une plaque HDF.
  6. Couche (120) ayant une perméabilité à l'air limitée conforme à l'une des revendications précédentes,
    caractérisée en ce que
    les éléments d'étanchéité sont des bandes d'étanchéité bosselées (140, 142 ; 146 ; 147 ; 148).
  7. Couche (120) ayant une perméabilité à l'air limitée conforme à la revendication 6,
    caractérisée en ce que les bandes d'étanchéité (140, 142 ; 146 ; 147 ; 148) présentent une élasticité.
  8. Couche (120) ayant une perméabilité à l'air limitée conforme à la revendication 6 ou 7,
    caractérisée en ce que
    les bandes d'étanchéité (140, 142 ; 146 ; 147 ; 148) ont une nature collante.
  9. Couche (120) ayant une perméabilité à l'air limitée conforme à la revendication 8,
    caractérisée en ce que
    l'adhésivité est adaptée à la pièce à usiner (300 ; 310 ; 320 ; 340).
  10. Couche (120) ayant une perméabilité à l'air limitée conforme à la revendication 8 ou 9,
    caractérisée en ce que
    les bandes d'étanchéité (140, 142 ; 146 ; 147 ; 148) sont réalisées en un matériau adhésif élastique ne pouvant pas être attaqué par les huiles de coupe et les fluides de refroidissement.
  11. Couche (120) ayant une perméabilité à l'air limitée conforme à la revendication 6 à 10,
    caractérisée en ce que
    les bandes d'étanchéité (140, 142) s'étendent sur la surface en étant réparties de façon aléatoire de sorte qu'elles se croisent respectivement et forment ainsi des zones d'aspiration fermées (145).
  12. Couche (120) ayant une perméabilité à l'air limitée conforme à la revendication 6 à 11,
    caractérisée en ce que
    les bandes d'étanchéité (140, 142 ; 146 ; 147 ; 148) s'étendent sur la surface de façon à former un ensemble de dessins respectivement situés au voisinage les uns des autres, en particulier de dessins en forme de carreaux, de dessins circulaires ou de dessins en forme de nids d'abeilles.
  13. Couche (120) ayant une perméabilité à l'air limitée conforme à l'une des revendications 6 à 12,
    caractérisée en ce que
    à la partie interne des zones d'aspiration (145) sont situés d'autres points adhésifs (141).
  14. Couche (120) ayant une perméabilité à l'air limitée conforme à la revendication 6 à 13,
    caractérisée en ce que
    le tracé des bandes d'étanchéité (146 ; 147 ; 148) reproduit respectivement le contour de la pièce (310 ; 320 ; 340) à usiner.
  15. Couche (120) ayant une perméabilité à l'air limitée conforme à l'une des revendications 6 à 14,
    caractérisée en ce que
    la hauteur des bandes d'étanchéité (140, 142 ; 146 ; 147 ; 148) est adaptée à la rugosité de surface de la pièce à usiner (300 ; 310 ; 320 ; 340).
  16. Couche (120) ayant une perméabilité à l'air limitée conforme à l'une des revendications précédentes,
    caractérisée en ce que
    le tracé des bandes d'étanchéité (140, 142, 146, 147, 148) est adapté aux ouvertures (115) réalisées dans la plaque de base (110).
  17. Couche (120) ayant une perméabilité à l'air limitée conforme à la revendication 16,
    caractérisée en ce que
    les bandes d'étanchéité (140, 142 ; 146 ; 147 ; 148) s'étendent de sorte qu'une ouverture (115) soit répartie sur plusieurs zones d'aspiration (145).
  18. Couche (120) ayant une perméabilité à l'air limitée conforme à la revendication 16,
    caractérisée en ce que
    au moins une ouverture (115) est située dans une zone d'aspiration (145) respective.
  19. Couche (120) ayant une perméabilité à l'air limitée conforme à l'une des revendications précédentes,
    caractérisée en ce que
    plusieurs ouvertures (115) sont situées dans une zone d'aspiration (145 ; 146' ; 147' ; 148') respective.
  20. Couche (120) ayant une perméabilité à l'air limitée conforme à l'une des revendications précédentes,
    caractérisée en ce que
    sur sa face située à l'opposé de la pièce à usiner et tournée vers la face supérieure de la plaque de base (110) est positionné au moins un élément d'étanchéité (190) qui est formé par une bande d'étanchéité (190) formant une structure refermée sur elle-même.
  21. Couche (120) ayant une perméabilité à l'air limitée conforme à la revendication 20,
    caractérisée en ce que
    la bande d'étanchéité (190) s'étend au bord de la couche (120) ayant une perméabilité à l'air limitée.
  22. Couche (120) ayant une perméabilité à l'air limitée conforme à l'une des revendications 6 à 21,
    caractérisée en ce que
    les bandes d'étanchéité (140, 142 ; 146 ; 147 ; 148) peuvent être appliquées par sérigraphie sur la couche (120) ayant une perméabilité à l'air limitée.
  23. Couche (120) ayant une perméabilité à l'air limitée conforme à l'une des revendications 6 à 21,
    caractérisée en ce que
    les bandes d'étanchéité (140, 142 ; 146 ; 147 ; 148) peuvent être appliquées sur la couche (120) ayant une perméabilité à l'air limitée par distribution commandée par calculateur.
  24. Couche (120) ayant une perméabilité à l'air limitée conforme à l'une des revendications 6 à 21,
    caractérisée en ce que les bandes d'étanchéité (140, 142 ; 146 ; 147 ; 148 ; 190) peuvent être appliquées sur la couche (120) ayant une perméabilité à l'air limitée à l'aide d'une calandre et/ou par pulvérisation d'un adhésif chaud à la forme des bandes d'étanchéité (140, 142 ; 146 ; 147 ; 148 ; 190) et/ou par pulvérisation d'un adhésif sur un pochoir et/ou par impression en taille douce au moyen de rouleaux de transfert.
  25. Couche (120) ayant une perméabilité à l'air limitée conforme à l'une des revendications 6 à 21,
    caractérisée en ce que
    les bandes d'étanchéité (140, 142 ; 146 ; 147 ; 148 ; 190) sont recouvertes par une couche de protection pouvant être extraite par traction (200).
  26. Couche (120) ayant une perméabilité à l'air limitée conforme à la revendication 25,
    caractérisée en ce que
    la couche de protection (200) est un papier au silicone ou un film de protection.
EP20080007947 2007-05-01 2008-04-24 Couche à perméabilité à l'air limitée pour un dispositif de positionnement de pièces à usiner Active EP1987923B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007020669 2007-05-01
DE102007031579A DE102007031579A1 (de) 2007-05-01 2007-07-06 Begrenzt luftdurchlässige Schicht für eine Vorrichtung zur Positionierung von Werkstücken

Publications (3)

Publication Number Publication Date
EP1987923A2 EP1987923A2 (fr) 2008-11-05
EP1987923A3 EP1987923A3 (fr) 2010-09-15
EP1987923B1 true EP1987923B1 (fr) 2014-08-27

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ES2370567B1 (es) * 2009-11-12 2012-11-27 Abengoa Solar New Technologies, S.A. Mesa de conformado para el curvado de espejos.

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US3335994A (en) 1965-04-27 1967-08-15 Cocito Joe Michael Vacuum holder
US3865359A (en) 1972-05-01 1975-02-11 Dbm Industries Ltd Vacuum apparatus
US3907268A (en) * 1974-03-29 1975-09-23 Thomas F Hale Valve means for vacuum holding device
JPS61152499A (ja) * 1984-12-27 1986-07-11 大日本スクリ−ン製造株式会社 硬質板の吸着、保持方法及びその方法の実施に使用する軟質シ−ト
DE4030113A1 (de) 1990-09-24 1992-03-26 Wissner Rolf Vorrichtung zum spannen von zu bearbeitenden platten
US5987729A (en) * 1994-06-24 1999-11-23 Moran; Thomas F. Multiple plenum suction hold down device
DE20117390U1 (de) 2001-10-24 2002-04-25 Wissner Rolf Vorrichtung zum Spannen von zu bearbeitenden Platten mit Unterdruck
DE20310978U1 (de) * 2003-07-17 2003-10-09 Tts Tooltechnic Systems Ag Vorrichtung zum Festspannen von Werkstücken auf einer Werkbank
DE10357268B3 (de) 2003-12-01 2005-06-09 Mb-Portatec Gmbh Verfahren und Anordnung zur Bearbeitung von Dünnblechen und dünnwandigen, einfach oder doppelt gekrümmten Platten oder Schalen

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EP1987923A2 (fr) 2008-11-05

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