DE3016953C1

DE3016953C1 - Forming device for sheets made of thermoplastic material

Info

Publication number: DE3016953C1
Application number: DE19803016953
Authority: DE
Inventors: Horst 6108 Weiterstadt Bormet
Original assignee: Individual
Current assignee: Individual
Priority date: 1980-05-02
Filing date: 1980-05-02
Publication date: 1983-03-31

Description

Jeweils im Inneren des Unterrahmens 4 bzw. des Oberrahmens 6 ist ein unterer bzw. oberer Spannrahmen 10 bzw. 11 angeordnet Zwischen den Spannrahmen 10, 11 ist die Platte 3 aus thermoplastischem Material, beispielsweise Acrylglas, mit ihren Rändern eingespannt Die beiden Spannrahmen 10, 11 bestehen jeweils aus zwei Längsholmen 12 (Fig 1), die an ihren Enden am Unterrahmen 4 bzw. am Oberrahmen 6 verstellbar befestigt sind. Mehrere Querstege 13 verbinden die Längsholme 12. Die Querstege 13 sind an ihren Enden ebenfalls verstellbar an den Längsholmen 12 befetigt und können ausgewechselt werden, um den gegenseitigen Abstand der Längsholme 12 verändern zu können. Each inside the lower frame 4 and the upper frame 6 is a lower and upper clamping frame 10 and 11 respectively arranged between the clamping frames 10, 11 is the plate 3 made of thermoplastic material, for example acrylic glass, clamped with their edges The two clamping frames 10, 11 each consist of two longitudinal spars 12 (FIG. 1), which at their ends on the lower frame 4 and on the upper frame 6 are adjustable. Several transverse webs 13 connect the longitudinal spars 12. The ends of the transverse webs 13 are also adjustable on the longitudinal spars 12 fastened and can be exchanged for the mutual spacing of the longitudinal spars 12 to be able to change.

Auf diese Weise sind die Spannrahmen 10, 11 verstellbar, so daß der im Inneren des Spannrahmens 10 bzw. 11 zur Verfügung stehende Raum zur Anpassung an unterschiedliche Werkstücksgrößen und Formgrö ßen verändert werden kann.In this way, the clamping frames 10, 11 are adjustable so that the space available for adjustment in the interior of the clamping frame 10 or 11 can be changed to different workpiece sizes and mold sizes.

Um die Einspannung der Platte 3 zwischen den Spannrahmen 10 und 11 zu ermöglichen, ist an den Längsholmen 12 des unteren Spannrahmens 10 jeweils ein in F i g. 3 nur im Schnitt dargestellter, sich im wesentlichen über die gesamte Länge des Längsholms 12 erstreckender Riegel 14 längsverschiebbar geführt. To clamp the plate 3 between the clamping frames 10 and 11 to enable is on the longitudinal spars 12 of the lower clamping frame 10 in each case in Fig. 3 shown only in section, is essentially over the entire Length of the longitudinal spar 12 extending bolt 14 out longitudinally displaceable.

Die Riegel 14 sind mit mehreren hakenförmigen, nach oben ragenden Platten 15 verbunden, die jeweils mit einer Schrägfläche 16 bei ihrer Längsverschiebung mit Spannbolzen 17 in Eingriff treten, die an den Längsholmen 12 des oberen Spannrahmens seitlich angebracht sind. Die Längsverschiebung der Riegel 14 erfolgt jeweils mittels eines Druckmittelzylinders 18, der an einem Ende des Längsholms 12 angebracht ist In gleicher Weise ist der Oberrahmen 6 mit dem Unterrahmen 4 verspannbar. An allen vier Kanten des Unterrahmens 4 ist jeweils ein Riegel 19 längsverschiebbar geführt, der jeweils durch einen Druckmittelzylinder 20 angetrieben wird. Ebenso wie bei der vorher beschriebenen Spanneinrichtung für die Spannrahmen 10, 11 ragen auch von den Riegeln 19 mehrere hakenförmige Platten 21 nach oben, die Schrägflächen 22 aufweisen. Jede dieser Schrägflächen 22 greift bei einer Längsverschiebung des Riegels 19 über einen Spannzapfen 23, der am Oberrahmen 6 angebracht ist Auf diese Weise wird bei einer Längsverschiebung der Riegel 19 der Oberrahmen 6 an allen Seiten gegen den Unterrahmen 4 gezogen. Damit die Scharniere 5 diese Spannbewegung nicht behindern, ist jeder Scharnier zapfen 24 in einem Langloch 25 angeordnet, das die für die Spannbewegung nötige Bewegungsfreiheit gibt ohne daß dadurch die Führung des Oberrahmens 6 gegenüber dem Unterrahmen 4 beeinträchtigt würde.The latches 14 have a plurality of hook-shaped, upwardly protruding Plates 15 connected, each with an inclined surface 16 during their longitudinal displacement with clamping bolts 17 engage, which on the longitudinal spars 12 of the upper clamping frame are attached to the side. The longitudinal displacement of the bolt 14 takes place in each case by means of a pressure medium cylinder 18 which is attached to one end of the longitudinal spar 12 The upper frame 6 can be braced with the lower frame 4 in the same way. At all four edges of the lower frame 4 a bolt 19 is guided in a longitudinally displaceable manner, each of which is driven by a pressure cylinder 20. As with the previously described clamping device for the clamping frames 10, 11 also protrude from the bars 19 several hook-shaped plates 21 upwards, the inclined surfaces 22 have. Each of these inclined surfaces 22 engages in a longitudinal displacement of the Latch 19 via a clamping spigot 23 which is attached to the upper frame 6 on this When the bolt 19 is longitudinally displaced, the upper frame 6 becomes on all sides pulled against the subframe 4. So that the hinges 5 do not have this tensioning movement hinder, each hinge pin 24 is arranged in an elongated hole 25 that the there is freedom of movement necessary for the clamping movement without thereby affecting the guide of the upper frame 6 compared to the lower frame 4 would be impaired.

Wie F ig. 3 zeigt, können die Längsholme 12 und die Querstege 13 aus einem Rahmenprofil bestehen, das an der Rahmeninnenseite eine hinterschnittene Profilnut 26 aufweist, in die jeweils eine am Ende jedes Rahmenstegs 13 angebrachte Klemmplatte 27 greift Die in F i g. 5 in iher aufrechten Stellung im Schnitt gezeigte, rechteckige Klemmplatte 27 ist an einem Klemmbolzen 28 angebracht, der um die Längsachse des Rahmenstegs 13 drehbar in einer Bohrung 29 eines am Ende des Rahmenstegs 13 angeschraubten Abschlußstücks 30 geführt ist. Der Klemmbolzen 28 weist an seinem in die Profilnut 26 des Querstegs 13 ragenden Ende ein Schlüsselprofil, beispielsweise einen Vierkant 31 sowie einen am Klemmbolzen 28 befestigten Lagerring 32 auf. Like fig. 3 shows, the longitudinal spars 12 and the transverse webs 13 consist of a frame profile with an undercut on the inside of the frame Has profile groove 26, in each of which one attached to the end of each frame web 13 Clamping plate 27 engages the in F i g. 5 shown in its upright position in section, rectangular clamping plate 27 is attached to a clamping bolt 28 around the longitudinal axis of the frame web 13 rotatable in a bore 29 of one at the end of the frame web 13 screwed terminator 30 is performed. The clamping bolt 28 has on his in the profile groove 26 of the transverse web 13 protruding end a key profile, for example a square 31 and a bearing ring 32 fastened to the clamping bolt 28.

Die Klemmplatte 27 und/oder die Profilnut 26 weisen in den einander im festgespannten Zustand berührenden Bereichen Anschrägungen 33 auf Zum Festspannen des Querstegs 13 am Längsholm 12 wird die# Klemmplatte 27 in einer gegenüber der F i g. 5 um 900 verdrehten Stellung in die Profilnut 26 eingeführt und dann mittels eines am Vierkant 31 angreifenden Werkzeugs um angenähert 900 gedreht, wobei die zusammenwirkenden Schrägflächen 33 ein Festspannen bewirken. The clamping plate 27 and / or the profile groove 26 point into each other In the clamped state, areas in contact with bevels 33 on For clamping of the crosspiece 13 on the longitudinal spar 12 is the # clamping plate 27 in a opposite to the F i g. 5 inserted into the profile groove 26 rotated by 900 and then by means of a tool acting on the square 31 rotated by approximately 900, the cooperating inclined surfaces 33 cause a tightening.

Im Rahmenprofil der Längsholme 12 und Querstege 13 können auf der dem anderen Spannrahmen 10 bzw. In the frame profile of the longitudinal spars 12 and transverse webs 13 can be on the the other clamping frame 10 or

11 zugekehrten Seite der Profilnut 26 oder auf beiden Seiten der Profilnut 26 längsverlaufende Heizkanäle 34 vorgesehen sein, durch die ein Heizmedium, beispielsweise Wasser, geführt werden kann, um die Spannrahmen aufzuheizen, wenn dies für den jeweiligen Umformvorgang erwünscht oder notwendig ist.11 facing side of the profile groove 26 or on both sides of the profile groove 26 longitudinal heating channels 34 can be provided through which a heating medium, for example Water, can be run to heat the stenter frame, if that is for the particular one Forming process is desired or necessary.

Das in F Ig. 3 gezeigte Rahmenprofil der Längsholme 12 und Querstege 13 ist als Strangpreßprofil aus einer Leichtmetallegierung hoher Festigkeit hergestellt. Zur Festlegung der Platte 3 sind in der der Platte 3 zugekehrten Fläche Rippen 12.1 angeformt, während in der gegenüberliegenden Fläche# zur Abdichtung ein elastisches Dichtungsprofil, beispielsweise eine Rundschnur 12.2, in eine Nut 12.3 eingelegt ist Diese Maßnahmen sind auch bei den Querstegen 13 vorgesehen. That in F Ig. 3 shown frame profile of the longitudinal spars 12 and transverse webs 13 is made as an extruded profile from a light metal alloy of high strength. To fix the plate 3, ribs 12.1 are in the surface facing the plate 3 molded, while in the opposite surface # for sealing an elastic Sealing profile, for example a round cord 12.2, inserted into a groove 12.3 These measures are also provided for the transverse webs 13.

Anstelle der Strangpreßausführung der Teile 12 und 13 ist es auch möglich, die Längsholme 12 und Querstege 13 aus mehreren Profilstäben marktgängiger Profile, beispielsweise U-Profile und Rechteckprofile, herzustellen, die miteinander verschraubt und verstiftet sind. Instead of the extrusion of parts 12 and 13, it is also possible, the longitudinal spars 12 and transverse webs 13 made of several profile rods commercially available Profiles, for example U-profiles and rectangular profiles, produce the one another are screwed and pinned.

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Claims

Claims: 1. Forming device for sheets made of thermoplastic Material, with a molding table supporting a mold, above which the plate to be formed with its edge between a lower and an upper clamping frame can be clamped by this is, each on a subframe or a foldable relative to this Upper frame are attached, characterized in that the lower frame (4) together with the upper frame (6) relative to the molding table (2) is adjustable in height that the two clamping frames (10, 11) each consisting of two at their ends on the upper frame (6) or on the lower frame (4) against each other adjustable attached longitudinal bars (12) and from several of these connecting and attached to them interchangeably and adjustably Questegen (13) exist, at least the longitudinal spars (12) having a profile, which has an undercut profile groove (26) on the inside, in each of which one at the end of each transverse web (13) attached clamping plate (27) engages.

2. Forming device according to claim 1, characterized in that the clamping plate (27) on a clamping bolt rotatable about the longitudinal axis of the transverse web (13) (28) attached and in the profile groove (26) by means of an inclined surface (33) at a Rotation is clamped.

The invention relates to a reshaping device for thermoplastic sheets Material, with a molding table supporting a mold, above which the plate to be formed with its edge between a lower and an upper clamping frame can be clamped by this is, each on a subframe or a foldable relative to this Upper frame are attached.

In such a known forming device (CH-PS 3 15 667) is the molding table with the attached lower frame, on which the upper frame can be folded up is stored, jointly adjustable in height.

The lower clamping frame is formed by the edge of the mold; the The upper clamping frame is also made in one piece and cannot be adjusted. To the Adaptation to different shape sizes would have to completely replace the upper frame will. Each of the forms used must have a suitable lower tenter frame Have edge. It is not possible to use forms of different heights.

The object of the invention is therefore to provide a shaping device of the initially mentioned called type so that they can be used with a particularly simple structure suitable for easy replacement of differently sized shapes is.

This object is achieved according to the invention in that the subframe together with the upper frame relative to the molding table is adjustable in height that the two clamping frames each made of two at their ends on the upper frame and on the lower frame mutually adjustable fixed longitudinal spars and from several connecting them and there are interchangeable and adjustable crossbars attached to them, wherein at least the longitudinal spars have a profile that has an undercut on the inside Has a profile groove, in each of which a clamping plate attached to the end of each transverse web engages.

Adjustable clamping frames are known per se in forming devices. However, what all known embodiments have in common is that they are of relative complex structure. The claimed type of adjustable connection of the Cross webs with the longitudinal spars can be made quickly with a simple structural design and easy adjustment too.

A length adjustment option has proven to be advantageous to dispense with the crossbars and instead make them interchangeable. Of the Effort is relatively low because the crossbars themselves are very simple are.

The ability to jointly adjust the height of the subframe and upper frame allows quick and easy replacement also very different large forms.

A particularly advantageous type of detachable fastening of the crossbars on the longitudinal spars is a development of the inventive concept in that the Clamping plate attached to a clamping bolt rotatable about the longitudinal axis of the crosspiece and can be clamped in the profile groove during rotation by means of an inclined surface.

The invention is explained in more detail below using an exemplary embodiment explained, which is shown in the drawing. It shows F i g 1 in a simplified manner Representation of a shaping device in a plan view, FIG. 2 a section along the line II-II in FIG. 1 and 3 show an even more enlarged partial section along line 111-111 in FIG. 1.

The forming device shown in the figures has a frame 1 on (Fig. 2), which carries a molding table 2. The molding table 2 can with (not shown) Openings be provided with a suction device, also not shown see to generate a negative pressure in connection to the plate to be formed 3 to draw in a form that rests on the forming table 2 (not shown).

On the molding table 2 is a composed of double-T profiles Subframe 4 arranged on one side via hinges 5 with a likewise from double-T-profiles standing upper frame 6 is connected so that the upper frame 6 can be opened.

The subframe 4 is provided with vertical guide pins 7, which guided vertically movable in cylindrical guides 8 below the molding table 2 are. Four vertical pressure medium cylinders act on the subframe 4 in order to this to be lifted in relation to the molding table 2.