EP1987923B1 - Layer with limited air permeability for a device for positioning workpieces - Google Patents
Layer with limited air permeability for a device for positioning workpieces Download PDFInfo
- 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
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- air permeability
- limited air
- sealing strips
- 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.)
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Links
- 230000035699 permeability Effects 0.000 title claims 33
- 238000007789 sealing Methods 0.000 claims description 100
- 239000010410 layer Substances 0.000 claims description 92
- 230000001070 adhesive effect Effects 0.000 claims description 19
- 239000000853 adhesive Substances 0.000 claims description 15
- 239000011241 protective layer Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 7
- 229920001296 polysiloxane Polymers 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 6
- 239000012876 carrier material Substances 0.000 claims description 5
- 239000004831 Hot glue Substances 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 3
- 239000010730 cutting oil Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000007650 screen-printing Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 239000011888 foil Substances 0.000 claims description 2
- 230000003746 surface roughness Effects 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims 1
- 239000003292 glue Substances 0.000 claims 1
- 238000003801 milling Methods 0.000 description 21
- 239000000123 paper Substances 0.000 description 17
- 230000000694 effects Effects 0.000 description 9
- 238000003754 machining Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 239000011094 fiberboard Substances 0.000 description 2
- 239000004834 spray adhesive Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000005068 cooling lubricant Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
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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- Mechanical Engineering (AREA)
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Description
Die Erfindung betrifft eine begrenzt luftdurchlässige Schicht für eine Vorrichtung zur Positionierung und Befestigung von zu bearbeitenden Werkstücken nach dem Oberbegriff des Anspruchs 1.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.
Eine begrenzt luftdurchlässige Schicht für eine Vorrichtung zur Positionierung von Werkstücken geht aus der
Aus der
Aus der
Während der Bearbeitung des Werkstücks, beispielsweise durch Fräsen, kann es vorkommen, dass der Fräskopf bis hinunter in die begrenzt luftdurchlässige Schicht fährt und hierbei die Schicht teilweise beschädigt. In diesem Falle wird durch die begrenzt luftdurchlässige Schicht sichergestellt, dass das Vakuum nicht vollständig zusammenbricht, sondern das Werkstück auf der Platte weiterhin gehalten wird. Eine solche Vorrichtung ist auch aus der
Gegenstand der
Bei den aus der
Die
Der Erfindung liegt daher die Aufgabe zugrunde, die vorgenannten Nachteile zu beseitigen und eine begrenzt luftdurchlässige Schicht zu schaffen, die zum Einen leicht kostengünstig herstellbar ist und zum Anderen leicht zu handhaben ist und auch bei kleinen zu bearbeitenden Werkstücken sowie bei Werkstücken mit rauer Oberfläche eine sehr gute Positionierung und ein sehr gutes Halten des Werkstücks auf der Grundplatte durch das Vakuum ermöglicht.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.
Diese Aufgabe wird gelöst durch eine begrenzt luftdurchlässige Schicht mit den Merkmalen des Anspruchs 1. Durch das Zusammenwirken der Saugbereiche zwischen Werkstück und Grundplatte, die durch die Dichtelemente ausgebildet werden, mit dem Trägermaterial der begrenzt luftdurchlässigen Schicht, das so ausgebildet ist, dass sich eine maximale Durchströmbarkeit senkrecht zur Grundplatte einstellt, wird ein zuverlässiges Halten beliebiger Werkstücke mit sehr großer Haltekraft ermöglicht.This object is achieved by a limited air-permeable layer having the features of claim 1. By the interaction of the suction regions between the workpiece and the base plate, which are formed by the sealing elements, with the carrier material of the limited air-permeable layer, which is designed so that a maximum Throughflow adjustable perpendicular to the base plate, a reliable holding any workpieces with very high holding power is possible.
Grundidee der Erfindung ist es, durch die Mehrzahl von jeweils geschlossen verlaufenden, abgedichtete Saugbereiche bildenden Dichtelemente gewissermaßen mehrere nebeneinander liegende Saugnäpfe auszubilden, die in Verbindung mit dem Trägermaterial, das aufgrund seiner Ausbildung eine maximale Durchströmbarkeit senkrecht zur Grundplatte ermöglicht, die Haltekräfte des Werkstücks wesentlich erhöhen, selbst dann, wenn der Fräskopf die begrenzt luftdurchlässige Schicht, beispielsweise beim Ausfräsen von Öffnungen aufweisenden Werkstücken oder beim Umfräsen der Werkstückränder, teilweise beschädigt. In diesem Falle übernehmen gewissermaßen die anderen geschlossenen und abgedichteten Saugbereiche oder Saugnäpfe das Halten des Werkstücks.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.
Durch die in den abhängigen Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der in dem unabhängigen Anspruch angegebenen begrenzt luftdurchlässigen Schicht möglich.The measures listed in the dependent claims advantageous refinements and improvements of the independent claim specified limited air permeable layer are possible.
So wird die begrenzt luftdurchlässige Schicht vorteilhafterweise durch einen auf die Oberseite der Grundplatte aufgelegten durch das Trägermaterial gebildeten Bogen oder durch eine Platte gebildet, auf dessen/deren wenigstens einer Oberfläche die Dichtelemente befestigt sind. Dieser Bogen/diese Platte kann, wie nachstehend noch näher erläutert wird, aus den unterschiedlichsten Materialien gebildet sein.Thus, 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.
Das Trägermaterial ist so ausgebildet, dass sich eine maximale Durchströmbarkeit senkrecht zur Grundplatte einstellt. Dies kann durch die unterschiedlichsten Materialien realisiert werden. Gemäß einer vorteilhaften Ausgestaltung kann der Bogen aus Papier, insbesondere Filterpapier, gebildet sein. Der Bogen weist nur eine geringe Dicke von etwa 0,5 mm bis 2 mm auf. Hierdurch wird die maximale Durchströmbarkeit senkrecht zur Grundplatte realisiert und gleichzeitig verhindert, dass eine seitliche Einströmung stattfindet, denn durch die geringe "Dicke" des bogenförmigen Trägers ist dieser senkrecht zur Grundplatte leicht durchströmbar, während er in der Ebene der Grundplatte oder anders ausgedrückt senkrecht zur Durchströmungsrichtung aufgrund seiner flächigen Ausdehnung ein großes Hindernis für durchströmende Luft darstellt.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. According to an advantageous embodiment of the sheet of paper, in particular filter paper may be formed. The sheet has only a small thickness of about 0.5 mm to 2 mm. As a result, the maximum Durchströmbarkeit is realized perpendicular to the base plate and at the same time prevents a lateral inflow, because by the small "thickness" of the arcuate support this is perpendicular to the base plate easily flowed through, while in the plane of the base plate or in other words perpendicular to the flow direction Due to its areal expansion, it represents a major obstacle to air flowing through.
Der Bogen kann aber auch durch eine ebenfalls dünn ausgebildete so genannte Skinpappe gebildet werden oder durch eine MDF- oder HDF-Platte, also eine mitteldichte Faserplatte oder eine hochdichte Faserplatte, die porös ausgebildet sind.However, 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.
Die Dichtelemente selbst sind bevorzugt erhabene Dichtstreifen, die auch als Dichtwälle bezeichnet werden können. Diese Dichtstreifen oder Dichtwälle ermöglichen eine hohe Flächenpressung und damit eine besonders optimale Abdichtung.The 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.
Bevorzugt sind die Dichtstreifen elastisch ausgebildet. Sie passen sich so kleinen Unebenheiten des zu bearbeitenden Werkstücks und/oder der Grundplatte an und erhöhen auf diese Weise die Dichtwirkung wesentlich. Eine besonders vorteilhafte Ausführungsform sieht vor, dass diese Dichtstreifen eine klebrige Beschaffenheit aufweisen. Hierdurch wird das Werkstück bereits durch die Klebewirkung gehalten, wobei hierdurch insbesondere auch eine leichte Positionierung möglich ist.Preferably, 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.
Die Klebrigkeit der Dichtstreifen wird dabei vorteilhafterweise an das zu bearbeitende Werkstück angepasst derart, dass nach dem Bearbeitungsvorgang, wenn das Werkstück wieder von der begrenzt luftdurchlässigen Schicht entfernt wird, ein rückstandsfreies Ablösen möglich ist. Anders ausgedrückt wird die Klebrigkeit so eingestellt, dass keine Klebereste an dem bearbeiteten Werkstück haften.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. In other words, the tackiness is adjusted so that no adhesive residue adheres to the machined workpiece.
Die Dichtstreifen bestehen vorzugsweise aus einem elastischen, von Schneidölen und Kühlmitteln nicht angreifbaren Klebstoff.The sealing strips are preferably made of an elastic, not vulnerable to cutting oils and coolants adhesive.
Die Dichtstreifen sind bei einer vorteilhaften Ausführungsform nebeneinander auf der Oberfläche der begrenzt luftdurchlässigen Schicht unter beispielsweise Ausbildung eines beliebigen Musters von stochastisch verteilten Linien, die sich kreuzen und so jeweils Saugbereiche ausbilden, angeordnet.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.
Eine andere Ausführungsform sieht ein sich wiederholendes Muster vor, beispielsweise ein Karomuster oder ein Muster nebeneinanderliegender Kreise oder ein Wabenmuster. Ein solches Muster hat den Vorteil, dass es an beliebige Konturen der zu bearbeitenden Werkstücke anpassbar ist.Another embodiment provides 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.
Dabei wird die Größe der beispielsweise durch die Karos oder die Waben gebildeten Saugbereiche vorteilhafterweise an die Größe des zu bearbeitenden Werkstücks angepasst. Bei kleinen zu bearbeitenden Werkstücken ist das Karomuster demnach kleiner ausgebildet als bei größeren zu bearbeitenden Werkstücken.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.
Es kann gemäß einer Ausgestaltung der Erfindung auch vorgesehen sein, einen oder mehrere Klebepunkte, innerhalb der Saugbereiche vorzusehen, wobei deren Höhe der Höhe der Dichtstreifen im wesentlichen entspricht. Hierdurch wird ein weiter verbessertes Halten des Werkstücks aufgrund der Klebwirkung erzielt.It may also be provided according to an embodiment of the invention, 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.
Eine andere vorteilhafte Ausgestaltung, die eine Bearbeitung von nebeneinander liegenden Werkstücken im Nutzen ermöglicht, sieht vor, dass die Dichtstreifen auf der Oberfläche der begrenzt luftdurchlässigen Schicht so verlaufen, dass ihre Kontur den zu bearbeitenden Werkstücken jeweils nachgebildet ist. Wenn in diesem Falle z. B. herzförmige Muster hergestellt werden sollen, so können diese durch eine computergesteuerte Fräsmaschine nebeneinanderliegend aus einem massiven Werkstückblock herausgefräst werden. Die Dichtstreifen verlaufen dabei geschlossen herzförmig und zwar so nebeneinanderliegend auf der Schicht angeordnet, dass die ausgefrästen Teile nach der Bearbeitung auf der Platte gehalten werden. Die Dichtstreifen verlaufen also gerade geringfügig vor dem Rand, den der Fräskopf bei dem Herausfräsen der Teile umfährt, sodass sie noch innerhalb des zu bearbeitenden Werkstücks, dessen Kontur nachbildend, verlaufen.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.
Die Höhe der Dichtstreifen wird vorteilhafterweise an die Oberflächenrauigkeit angepasst. Ein Werkstück, das eine raue Oberfläche aufweist, erfordert dabei höhere Dichtstreifen als ein Werkstück mit einer glatten Oberfläche.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.
Bei einer weiteren vorteilhaften Ausführungsform ist vorgesehen, dass die begrenzt luftdurchlässige Schicht auch auf ihrer dem Werkstück abgewandten und der Grundplatte zugewandten Seite wenigstens ein Dichtelement aufweist. In diesem Falle verläuft das Dichtelement vorteilhafterweise am Randbereich der begrenzt luftdurchlässigen Schicht, also in der Nähe des Randbereichs des Bogens oder der Platte. Hierdurch wird eine besonders optimale Wirkung des Haltevakuums vermittelt.In a further advantageous embodiment, it is provided that 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. In this case, 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.
Die Dichtstreifen können auf die begrenzt luftdurchlässige Schicht auf die unterschiedlichste Art und Weise aufgebracht werden. Eine sehr vorteilhafte, da einfach und kostengünstig herzustellende Möglichkeit stellt das Aufdrucken der Dichtstreifen mittels Siebdrucktechnik dar. Bei einer wiederum anderen Ausführungsform werden die Dichtstreifen durch einen computergesteuerten Dispenser, also durch ein gezieltes computergesteuertes Aufbringen mittels einer verfahrbaren Düse auf die Oberfläche der begrenzt luftdurchlässigen Schicht aufgebracht. Eine weitere Möglichkeit ist das Aufbringen der Dichtstreifen mittels eines Kalanders. Eine wiederum andere Möglichkeit ist das Aufsprühen von Heißkleber in Gestalt der Dichtstreifen, das Aufsprühen von Kleber über Schablonen oder das Aufbringen der Dichtstreifen durch Tiefdruck mittels Übertragungswalzen.The sealing strips can be applied to the limited air-permeable layer in a variety of ways. In a yet another embodiment, 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.
Die Dichtstreifen sind im Falle einer klebrigen Konsistenz durch eine abziehbare Schutzschicht überdeckt. Diese Schutzschicht kann beispielsweise durch ein Silikonpapier oder eine Schutzfolie gebildet werden. Durch sie ist ein Transport übereinanderliegender Bögen möglich. Die abziehbare Schutzschicht ist darüber hinaus luftundurchlässig ausgebildet, sodass durch sie keine Abschwächung des Vakuums für den Fall hervorgerufen wird, dass das Werkstück die begrenzt luftdurchlässige Schicht nicht vollständig überdeckt. In diesem Falle wird beispielsweise mittels eines Messers die Kontur des Werkstücks nachgezeichnet und in diesem Bereich die Schutzschicht abgezogen. Das Werkstück wird sodann auf diesen Bereich aufgelegt, wobei es aufgrund der durch die Dichtelemente gebildeten Saugbereiche in optimaler Weise gehalten wird. Der Rest der begrenzt luftdurchlässigen Schicht ist dabei während der Bearbeitung des Werkstücks von der luftundurchlässigen Schutzschicht überdeckt. Auf diese Weise ist sichergestellt, dass das Vakuum im Bereich des Werkstücks, das gehalten werden soll, hoch ausgebildet ist, was bei einer begrenzt luftdurchlässigen Schicht, die keine Schutzschicht trägt, nicht der Fall ist. In diesem letzteren Falle würde das Vakuum geschwächt.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.
Der Verlauf der Dichtstreifen ist bevorzugt an die Öffnungen in der Grundplatte angepasst. Es können beispielsweise im Falle eines Karomusters die Dichtstreifen so angeordnet sein, dass jeweils aneinandergrenzende Ecken genau über einer Öffnung in der Grundplatte zu liegen kommen, sodass diese Öffnungen gewissermaßen auf vier Saugbereiche verteilt ist. Die Erfindung ist jedoch nicht auf eine solche Anordnung beschränkt, sondern es kann auch vorgesehen sein, dass die Öffnungen innerhalb der Saugbereiche liegen. Dabei können auch mehrere Öffnungen innerhalb der Saugbereiche angeordnet sein.The course of the sealing strips is preferably adapted to the openings in the base plate. For example, in the case of a checker pattern, 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. However, 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.
Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen:
- Fig. 1a
- schematisch die Anordnung einer erfindungsgemäßen begrenzt luftdurchlässigen Schicht über einer ersten Grundplatte;
- Fig. 1b
- schematisch die Anordnung einer erfindungsgemäßen begrenzt luftdurchlässigen Schicht über einer anderen Grundplatte;
- Fig. 2a
- schematisch, in Draufsicht die Anordnung der Dichtelemente sowie fakultativ möglicher Klebepunkte auf einer begrenzt luftdurchlässigen Schicht über der ersten, in
Fig 1a dargestellten Grundplatte; - Fig. 2b
- schematisch in Draufsicht die Anordnung einer mit Dichtelementen versehenen begrenzt luftdurchlässigen Schicht über der weiteren, in
Fig. 1b dargestellten Grundplatte; - Fig. 2c
- die Anordnung einer mit Dichtelementen versehenen begrenzt luftdurchlässigen Schicht über einer dritten Grundplatte;
- Fig. 3
- ein auf einer ersten Ausführungsform der begrenzt luftdurchlässigen Schicht positioniertes Werkstück;
- Fig. 4
- drei auf einer zweiten Ausführungsform der begrenzt luftdurchlässigen Schicht positionierte Werkstücke.
- Fig. 1a
- schematically the arrangement of a limited air-permeable layer according to the invention over a first base plate;
- Fig. 1b
- schematically the arrangement of a limited air-permeable layer according to the invention over another base plate;
- Fig. 2a
- schematically, in plan view, the arrangement of the sealing elements and optionally possible adhesive dots on a limited air-permeable layer over the first, in
Fig. 1a illustrated base plate; - Fig. 2b
- schematically in plan view the arrangement of a provided with sealing elements limited air-permeable layer over the other, in
Fig. 1b illustrated base plate; - Fig. 2c
- the arrangement of a provided with sealing elements limited air permeable layer over a third base plate;
- Fig. 3
- a workpiece positioned on a first embodiment of the limited air-permeable layer;
- Fig. 4
- three on a second embodiment of the limited air-permeable layer positioned workpieces.
Eine Vorrichtung zur Positionierung und Befestigung von zu bearbeitenden Werkstücken, dargestellt in
Die Öffnungen 115 sind an ihrer Unterseite über entsprechende Kanäle 116 mit einer Vakuumpumpe 118 verbunden, durch die auf an sich bekannte Weise ein Vakuum an der Oberseite der Grundplatte 110 zum Halten eines Werkstücks 300, 310, 320, 340 (
Die Oberseite der Grundplatte 110 ist mit einer begrenzt luftdurchlässigen Schicht 120 überdeckt, die beispielsweise in Form eines Papierbogens, insbesondere eines Papierbogens aus Filterpapier oder dergleichen, oder einer so genannten Skinpappe oder einer MDF- oder HDF-Platte ausgebildet sein kann. Diese begrenzt luftdurchlässige Schicht 120 ist porös ausgebildet. Sie wirkt als Drossel und Dämpfung des Vakuums und ermöglicht eine gleichmäßig verteilte Wirkung des Vakuums auf ein zu positionierendes und zu befestigendes Werkstück 300, 310, 320, 340 (
Bei einer an sich bekannten begrenzt luftdurchlässigen Schicht, wie sie beispielsweise aus der
Um derartig nachteilige Effekte zu verhindern, ist es nun Grundidee der Erfindung, auf der begrenzt luftdurchlässigen Schicht 120 eine Vielzahl von Saugbereichen auszubilden. Dies geschieht durch Aufbringen von Dichtstreifen 140 und 142 auf der dem zu bearbeitenden Werkstück 300, 310, 320 und 340 zugewandten Oberfläche. Diese Dichtstreifen 140 und 142 sind beispielsweise, wie in
Auch müssen die Dichtstreifen keinesfalls in einer regelmäßigen Ordnung auf der begrenzt luftdurchlässigen Schicht angeordnet werden. Möglich ist es vielmehr auch, die Dichtstreifen 140, 142 als stochastisch verteilte Linien, die sich kreuzen und so jeweils abgeschlossene Saugbereiche ausbilden, zu realisieren.Also, the 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.
Die Dichtstreifen 140, 142 bestehen bevorzugt aus einem elastischen Material, sodass sie sich an leichte Unebenheiten des Werkstücks 300, 310, 320, 340, insbesondere dann, wenn dieses eine raue Oberfläche aufweist, anpassen und dabei gleichzeitig eine optimale Abdichtung erzielen.The sealing strips 140, 142 are preferably made of an elastic material, so that they adapt to slight unevenness of the
Besonders vorteilhaft weisen die Dichtstreifen eine klebrige Konsistenz auf. In diesem Falle wird das zu bearbeitende Werkstück 300, 310, 320, 340 bereits durch die Klebrigkeit der Dichtstreifen 140, 142 gehalten. Die Klebrigkeit erhöht zudem die Dichtigkeit. Neben den Dichtstreifen können im Falle einer klebrigen Konsistenz der Dichtstreifen 140, 142 auch weitere Klebepunkte 141 vorgesehen sein, wie sie schematisch im linken oberen Bereich der
Es ist nun eine der maßgeblichen Ideen der Erfindung, eine Mehrzahl von nebeneinanderliegenden Saugbereichen 145 auszubilden.It is now one of the relevant ideas of the invention to form a plurality of juxtaposed
Durch diese Saugbereiche 145 wird sichergestellt, dass das Werkstück 300 (vergl.
Wie in
Es ist des Weiteren auch möglich, die Dichtstreifen 140, 142 so anzuordnen, dass jeweils mehrere Öffnungen 115 innerhalb der Saugbereiche 145 angeordnet sind, wie dies schematisch in
Generell kann gesagt werden, dass die Dichtstreifen 140, 142 und damit die Saugbereiche 145 zur Erzielung des erfindungsgemäßen Effekts nicht auf die Öffnungen 115 abgestimmt werden müssen.In general, it can be said that the sealing strips 140, 142 and thus the
Die Dichtstreifen 140, 142 werden bevorzugt durch einen elastischen Klebstoff gebildet, der gegenüber Schneidölen und Kühlmitteln, wie sie bei einem Fräsvorgang verwendet werden, unempfindlich ist und nicht angegriffen wird.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.
Die klebrigen, die Saugbereiche 145 bildenden Dichtstreifen 140, 142 sind durch eine Schutzschicht 200 überdeckt, die beispielsweise durch ein Silikonpapier oder durch eine Folie realisiert wird. Dieses Silikonpapier oder die Folie ist leicht von den Dichtstreifen 140, 142 abziehbar. Die Abdeckung durch das Silikonpapier oder die Folie geschieht aufgrund von zwei Gründen. Zum einen ist ein Transport übereinanderliegender, beispielsweise als Papierbögen ausgebildeter begrenzt luftdurchlässiger Schichten 120 auf diese Weise möglich, ohne dass die die Bögen aneinander verkleben. Zum anderen - und dies ist ein ganz wesentlicher Effekt - wird durch die luftundurchlässige Schutzschicht 200 in Form des Silikonpapiers oder der Folie das Vakuum in den Saugbereichen 145, die nicht von dem Werkstück 300 überdeckt sind, nicht geschwächt oder auf andere Weise negativ beeinflusst.The sticky sealing strips 140, 142 forming the
Wie in
Zu bemerken ist auch, dass die Ausbildung der Dichtstreifen 140, 142 als erhabene Wälle eine hohe Flächenpressung ermöglichen - im Vergleich zu der flächigen Aufbringung von beispielsweise Klebstoffen, wie sie aus dem Stand der Technik bekannt ist. Hierdurch wird die Dichtwirkung weiter wesentlich erhöht.It should also be noted that the formation of the 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.
Das in
Eine andere Ausführungsform, dargestellt in
Bei dem in
Bei dem in
Die in
Diese werkstückabhängigen Dichtelemente 146, 147, 148 können auch in diesem Fall zum Beispiel durch Siebdrucktechnik oder durch die anderen, oben beschriebenen Verfahren hergestellt werden.These workpiece-
Es kann gemäß einer Ausgestaltung der Erfindung auch vorgesehen sein, einen oder mehrere Klebepunkte, innerhalb der Saugbereiche 145, 146', 147', 148' vorzusehen, wobei deren Höhe der Höhe der Dichtstreifen im Wesentlichen entspricht. Hierdurch wird ein weiter verbessertes Halten des Werkstücks aufgrund der Klebwirkung erzielt (nicht dargestellt).It may also be provided according to an embodiment of the invention, one or more adhesive points, within the
Neben der Ausbildung der Saugbereiche auf der dem Werkstück 300, 310, 320, 340 zugewandten Oberfläche der begrenzt luftdurchlässigen Schicht 120 kann auch vorgesehen sein, auf der der Grundplatte 110 zugewandten Oberfläche der begrenzt luftdurchlässigen Schicht 120 einen oder mehrere das Haltevakuum weiter erhöhende Saugbereiche auszubilden. So kann beispielsweise vorgesehen sein, dass am Randbereich des Bogens, der die begrenzt luftdurchlässige Schicht 120 bildet, Dichtelemente 190 verlaufen. In diesem Falle ist auch die der Grundplatte 110 zugewandte Oberfläche der begrenzt luftdurchlässigen Schicht 120 zunächst mit einem Silikonpapier oder einer Schutzfolie überdeckt.In addition to the formation of the suction regions on the
Claims (26)
- Layer with limited air permeability (120) for a device for positioning and attaching to-be-processed workpieces (300; 310; 320, 340) on the upper surface of a substantially even base plate (110) having apertures (115), wherein the apertures (115) are in fluid connection with a vacuum pump (118) at the bottom side of the base plate (110), wherein the layer with limited air permeability (120) is disposed between the workpiece (300; 310; 320; 340) and the upper surface of the base plate (110), and wherein the layer with limited air permeability (120), at least on that one of its sides that is facing the workpiece, has sealing elements (140; 142; 146; 147; 148) which form a plurality of respectively closed sealed suction areas (145; 146'; 147'; 148') between the workpiece (300; 310; 320; 340) and the base plate (110), characterized in that they comprise, on the upper surface of the base plate (110), an applied arch made of a carrier material, which is formed in such a way that a maximal through-flow is created vertically to the base plate (110) and to which, on its at least one surface, the sealing elements (140; 142; 146; 147; 148) are attached.
- Layer with limited air permeability (120) according to claim 1, characterized in that the arch is made of paper, particularly filter paper.
- Layer with limited air permeability (120) according to claim 1, characterized in that the arch is made of skinboard.
- Layer with limited air permeability (120) according to claim 2 or 3, characterized in that the arch that is made of paper or skinboard has a thickness of 0.5 mm to 2 mm.
- Layer with limited air permeability (120) according to claim 1, characterized in that the arch is formed by a MDF or HDF panel.
- Layer with limited air permeability (120) according to any of the preceding claims, characterized in that the sealing elements are elevated sealing strips (140; 142; 146; 147; 148).
- Layer with limited air permeability (120) according to claim 6, characterized in that the sealing strips (140; 142; 146; 147; 148) exhibit an elasticity.
- Layer with limited air permeability (120) according to claims 6 or 7, characterized in that the sealing strips (140; 142; 146; 147; 148) have a sticky quality.
- Layer with limited air permeability (120) according to claim 8, characterized in that the stickiness is adjusted to the workpiece (300; 310; 320; 340) that is to be worked on.
- Layer with limited air permeability (120) according to claims 8 or 9, characterized in that the sealing strips (140; 142; 146; 147; 148) are made from an elastic adhesive that is resistent to cutting oils and cooling agents.
- Layer with limited air permeability (120) according to one of the claims 6 to 10, characterized in that the sealing strips (140; 142) are stochastically distributed and are arranged in such a way on the surface that the sealing strips (140; 142) intersect, respectively, thus forming closed suction areas (145).
- Layer with limited air permeability (120) according to one of the claims 6 to 11, characterized in that the sealing strips (140; 142; 146; 147; 148) are arranged in such a way on the surface that they form a plurality of respectively adjoining patterns, particularly checked patterns or circle patterns or honeycomb patterns.
- Layer with limited air permeability (120) according to one of the claims 6 to 12, characterized in that on the inside of the suction areas (145) further adhesion points (141) are arranged.
- Layer with limited air permeability (120) according to one of the claims 6 to 13, characterized in that the arrangement of the sealing strips (146; 147; 148) is adjusted according to the contour of the respective workpieces that are to be processed (310; 320; 340).
- Layer with limited air permeability (120) according to one of the claims 6 to 14, characterized in that the height of the sealing strips (140; 142; 146; 147; 148) is adjusted to the surface roughness of the workpieces that are to be processed (300; 310; 320; 340).
- Layer with limited air permeability (120) according to one of the preceding claims, characterized in that the arrangement of the sealing strips (140; 142; 146; 147; 148) is adjusted to the openings (115) in the base plate (110).
- Layer with limited air permeability (120) according to claim 16, characterized in that the sealing strips (140; 142; 146; 147; 148) are arranged in such a way that one opening (115) is distributed over several suction areas (145).
- Layer with limited air permeability (120) according to claim 16, characterized in that at least one opening (115) is arranged in one suction area (145), respectively.
- Layer with limited air permeability (120) according to one of the preceding claims, characterized in that several openings (115) are arranged in one suction area (145; 146'; 147'; 148';), respectively.
- Layer with limited air permeability (120) according to one of the preceding claims, characterized in that on its surface that is facing away from the workpiece and facing toward the top surface of the base plate (110) at least one sealing element (190) is arranged, which is formed by one single sealing strip (190) that is forming a self-contained structure.
- Layer with limited air permeability (120) according to claim 20, characterized in that the sealing strip (190) is disposed at the edge of the layer with limited air permeability (120).
- Layer with limited air permeability (120) according to one of the claims 6 to 21, characterized in that the sealing strips (140; 142; 146; 147; 148) can be applied onto the layer with limited air permeability (120) by using a screen printing technique.
- Layer with limited air permeability (120) according to one of the claims 6 to 21, characterized in that the sealing strips (140; 142; 146; 147; 148) can be applied onto the layer with limited air permeability (120) by using computer controlled dispensation.
- Layer with limited air permeability (120) according to one of the claims 6 to 21, characterized in that the sealing strips (140; 142; 146; 147; 148; 190) can be applied onto the layer with limited air permeability (120) by using a calender and/or by spraying on hot glue in the form of the sealing strips (140; 142; 146; 147; 148; 190) and/or by spraying on a glue over a stencil and/or by intaglio print using transfer rollers.
- Layer with limited air permeability (120) according to one of the claims 6 to 21, characterized in that the sealing strips (140; 142; 146; 147; 148; 190) are covered by a peelable protective layer (200).
- Layer with limited air permeability (120) according to claim 25, characterized in that the protective layer (200) is a silicone paper or a protective foil.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102007020669 | 2007-05-01 | ||
DE102007031579A DE102007031579A1 (en) | 2007-05-01 | 2007-07-06 | Defined air-permeable layer for work piece positioning and fastening device, has sealing elements on side of layer facing work piece, where sealing elements form set of closed, sealed suction regions between work piece and base plate |
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EP1987923A2 EP1987923A2 (en) | 2008-11-05 |
EP1987923A3 EP1987923A3 (en) | 2010-09-15 |
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EP20080007947 Active EP1987923B1 (en) | 2007-05-01 | 2008-04-24 | Layer with limited air permeability for a device for positioning workpieces |
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DE4030113A1 (en) | 1990-09-24 | 1992-03-26 | Wissner Rolf | Vacuum clamping of flat workpieces for machining - involves use of filter paper between workpiece and perforated baseplate |
US5987729A (en) * | 1994-06-24 | 1999-11-23 | Moran; Thomas F. | Multiple plenum suction hold down device |
DE20117390U1 (en) | 2001-10-24 | 2002-04-25 | Wissner, Rolf, Dipl.-Ing., 37079 Göttingen | Device for clamping plates to be processed with negative pressure |
DE20310978U1 (en) * | 2003-07-17 | 2003-10-09 | TTS Tooltechnic Systems AG & Co. KG, 73240 Wendlingen | Clamping system for workpieces for cabinet making has table with suction openings connected to suction pump and valve bodies with pushbuttons |
DE10357268B3 (en) | 2003-12-01 | 2005-06-09 | Mb-Portatec Gmbh | Method and arrangement for processing thin sheets and thin-walled, single or double curved sheets or shells |
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2008
- 2008-04-24 EP EP20080007947 patent/EP1987923B1/en active Active
Also Published As
Publication number | Publication date |
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EP1987923A2 (en) | 2008-11-05 |
EP1987923A3 (en) | 2010-09-15 |
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