WO1998043793A1 - Mold for compressing shaped bodies from plastic masses - Google Patents

Mold for compressing shaped bodies from plastic masses Download PDF

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Publication number
WO1998043793A1
WO1998043793A1 PCT/EP1998/001736 EP9801736W WO9843793A1 WO 1998043793 A1 WO1998043793 A1 WO 1998043793A1 EP 9801736 W EP9801736 W EP 9801736W WO 9843793 A1 WO9843793 A1 WO 9843793A1
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WO
WIPO (PCT)
Prior art keywords
mold
edge strips
mold according
voltage source
pole
Prior art date
Application number
PCT/EP1998/001736
Other languages
German (de)
French (fr)
Inventor
Rainer Händle
Original Assignee
Rieter-Werke Händle GmbH & Co. KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from EP19970105311 external-priority patent/EP0868985B1/en
Application filed by Rieter-Werke Händle GmbH & Co. KG filed Critical Rieter-Werke Händle GmbH & Co. KG
Priority to PCT/EP1998/001736 priority Critical patent/WO1998043793A1/en
Publication of WO1998043793A1 publication Critical patent/WO1998043793A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B5/00—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in, or on conveyors irrespective of the manner of shaping
    • B28B5/10—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in, or on conveyors irrespective of the manner of shaping in moulds carried on the circumference of a rotating drum
    • B28B5/12—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in, or on conveyors irrespective of the manner of shaping in moulds carried on the circumference of a rotating drum intermittently rotated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
    • B28B13/04—Discharging the shaped articles
    • B28B13/06—Removing the shaped articles from moulds
    • B28B13/065—Removing the shaped articles from moulds by applying electric current or other means of discharging, e.g. pneumatic or hydraulic discharging means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/36—Linings or coatings, e.g. removable, absorbent linings, permanent anti-stick coatings; Linings becoming a non-permanent layer of the moulded article
    • B28B7/364—Linings or coatings, e.g. removable, absorbent linings, permanent anti-stick coatings; Linings becoming a non-permanent layer of the moulded article of plastic material or rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/40—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material
    • B28B7/44—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material for treating with gases or degassing, e.g. for de-aerating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/40—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material
    • B28B7/46—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material for humidifying or dehumidifying

Definitions

  • the invention relates to a mold for pressing molded articles made of plastic materials, in particular ceramic material, according to the preamble of claim 1.
  • edges are each formed in one piece with the associated metal support part.
  • each mold half has a supporting part made of light metal or a light metal alloy, in particular an aluminum alloy, and a core made of synthetic resin, the side of which faces the mold cavity forms the negative form of the molded body to be produced.
  • This side of the core is covered with a rubber blanket, which provides an insulating intermediate layer between the mold and the molded body to be pressed. per forms.
  • the reason for the choice of synthetic resin for the production of the shaping cores was that synthetic resin is much easier and cheaper to modify than a solid metal mold when the molded body to be produced is modified. However, the detachment of the molded body from such a "composite shape" is difficult.
  • the invention has for its object to provide a mold for pressing moldings made of plastic materials, the mold halves made of composite material with a metal support member and a shaping core made of synthetic resin and nevertheless facilitates detachment of the pressed molded body from the mold by applying electrical current .
  • the two edge strips of the mold halves are spaced apart from one another by the ceramic mass when the mold is closed.
  • a voltage source is connected to one of the edge strips and to the other half of the mold. Current then flows from the rim on the ceramic composition between the two edge strips, the second edge strip and the current ⁇ conductive connections to the metal supporting part of the other mold half.
  • This process can be carried out by reversing the polarity of the voltage source, preferably a DC voltage source be repeated.
  • the detachment effect produced by "electric shocks" only in the edge region of the mold halves is sufficient to detach the molded body from the mold halves after the pressing process.
  • a method for releasing moldings from plastic materials from a mold has the features of claim 9.
  • a DC voltage source with a voltage of preferably 60 V is used, the negative pole of which is successively applied to the edge strip of one mold half and the other mold half via a changeover relay.
  • the edge strips are made of chrome-nickel steel, for example.
  • the edge strips are preferably arranged in an area outside the mold cavity and thus surround the mold cavity.
  • the plastic mass pressed into the distance between the edge strips in the form of a strip when the mold is closed, which creates a connection with the mold hollow body and conducts the current over the edge strips when an electrical voltage is applied, is surprisingly sufficient to detach the hollow mold body from the relevant mold half .
  • the remaining space in the intermediate strip-shaped rest of the plastic mass is when opening the mold and removing the molded body is separated from this Tin ⁇ or falls on it.
  • Air and / or water from the mold cavity are advantageous aspirated by measures according to one of claims 7 or 8.
  • Fig. 2 is a schematic representation of a drum arrangement with a total of five lower molds and an upper mold and a circuit arrangement for applying voltage surges to the lower mold and the upper mold, which are designed in detail according to FIG. 1.
  • an upper mold has a support part 2 made of an aluminum alloy and a core 4 made of synthetic resin, which is spanned by an intermediate layer made of a rubber membrane 6 on the mold cavity side.
  • An edge strip 8 made of chrome-nickel steel is stretched by means of countersunk screws 10 against the support part 2 and the core 4 while clamping the edge 12 of the rubber blanket 6. The edge strip 8 runs around the shape.
  • the lower mold has the same structure as the upper mold, and its components are therefore identified by the same reference numbers, which are, however, indicated with a line.
  • the lower mold has a support part 2 'made of an aluminum alloy, which is lined with a core 4 1 made of synthetic resin.
  • the mold cavity side of the core 4 ' is covered by a preformed rubber membrane 6'.
  • the edge 12 'of this rubber membrane is clamped to the support part 2' via an edge strip 8 'by means of countersunk screws 10'.
  • the countersunk screws 10, 10 ' are recessed with their heads 11, 11 * in the edge strips 8, 8'.
  • holes 3, 3 'are provided in the support parts 2, 2' through which a suction effect can be exerted can communicate through the porous cores 4, 4 'to the rubber blanket 6 or the rubber membrane 6'.
  • At least one of the support parts 2, 2 ', in the exemplary embodiment shown the lower support part 2', and the associated core 4 'with the rubber membrane 6' placed thereon are penetrated by hollow screws 16, 17 which are connected via a hose arrangement 18 to a passage 19 in the support part 2 'for discharging air and / or water from the mold cavity are tightly connected.
  • fine openings can also be provided in the region of the holes 3, 3 'in the rubber membranes 6, 6', so that air and / or water can then be sucked out of the mold cavity via the holes 3, 3 ' .
  • FIG. 2 shows a drum arrangement 20 with five lower molds with supporting parts 2 'and an upper mold 2 located in the uppermost position, which is acted upon by a press ram 22 via insulation 21. Between the upper form and a roof tile blank 13 is shown in the lower mold. The edge strips 8,8 'are also indicated.
  • an electrical circuit comprising a DC voltage source 24 is shown, which is electrically conductively connected via a changeover relay 26 on the one hand to the edge strip 8 of the upper mold and on the other hand to the shaft 28 of the drum arrangement 20 and thus to the metal support part 2 'of the lower mold.
  • the polarity of the negative pole and positive pole of the direct current source 24 can be switched via the changeover relay 26.
  • a current surge of the DC voltage source is applied for a predetermined, expedient period of time via the negative pole of the voltage source 24 attached to the upper edge strip 8 in order to cause the upper mold half to be detached from the top of the roof tile blank 13.
  • the polarity is reversed, so that the negative pole via the shaft 28 and the lower mold half, i.e. the support part 2 ', the screws 10' and the edge strip 8 'flows in the opposite direction over the strip 14 to the edge strip 8 in the upper mold half.
  • the lower mold half is detached from the brick blank 13.
  • the upper mold half can be lifted off without the risk of parts of the molded body 13 adhering to the mold and the drum arrangement 20 can be advanced by one step in the direction of the arrow, in which case the finished molded body can also be lifted off the lower mold half without the risk of damage.

Abstract

The invention relates to a mold for compressing shaped bodies (13) from ceramic material. The inventive device has two light-metal or light-metal alloy semi-molds, each having a supporting member (2, 2'), a plastic resin core (4, 4') and metallic edge strips (8, 8') on the hollow cavity of the mold. Said edge strips (8, 8') are electroconductively connected to the appropriate semi-molds, and one of the edge strips can be joined to the pole of an electrical voltage source. The other pole can be joined to the other appropriate semi-mold . A gap (14) filled with plastic mass separates the edge strips (8, 8') of both semi-molds when the mold is closed. When voltage is applied, electricity flows through said gap producing an electroshock which results in separation of the shaped body from the respective semi-mold.

Description

Form zum Pressen von Formkörpern aus plastischen Massen Mold for pressing moldings from plastic masses
Die Erfindung betrifft eine Form zum Pressen von Formkörpern aus plastischen Massen, insbesondere keramischem Material gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a mold for pressing molded articles made of plastic materials, in particular ceramic material, according to the preamble of claim 1.
Bei einer bekannten Form dieser Art (DE-B-1 224 649) sind die Ränder jeweils einteilig mit dem zugehörigen metallenen Stützteil ausgebildet.In a known form of this type (DE-B-1 224 649), the edges are each formed in one piece with the associated metal support part.
Es ist auch ein Verfahren zum Ablösen gepreßter Formkörper aus plastischen, insbesondere keramischen Massen bekannt, bei der zwei elektrisch gegeneinander isolierte, metallene Formhälften nacheinander mit dem Minuspol einer elektrischen Gleichspannungsquelle verbunden werden (DE-AS 1 052 290) , um so durch Elektro-Schockwirkung ein Ablösen des gepreßten Formkörpers von der jeweiligen Formhälfte zu bewirken.There is also known a method for detaching molded articles made of plastic, in particular ceramic materials, in which two metal mold halves which are electrically insulated from one another are successively connected to the negative pole of an electrical DC voltage source (DE-AS 1 052 290), in this way by means of an electrical shock effect to cause detachment of the pressed molded body from the respective mold half.
Auf dem Gebiet der Ziegelherstellung ist die Entwicklung in den vergangenen Jahrzehnten von der reinen Metallform aus Vollmaterial zu Verbundformen übergegangen, bei denen jede Formhälfte ein Stützteil aus Leichtmetall oder einer Leichtmetallegierung, insbesondere einer Aluminiumlegierung, und einen Kern aus Kunstharz aufweist, dessen dem Formhohlraum zugewandte Seite die Negativform des herzu- - stellenden Formkörpers bildet. Diese Seite des Kerns wird mit einem Gummituch überspannt, das eine isolierende Zwischenlage zwischen der Form und dem zu pressenden Formkör- per bildet. Grund für die Wahl von Kunstharz zum Herstellen der formgebenden Kerne war, daß Kunstharz bei einer Abänderung des herzustellenden Formkörpers viel leichter und billiger zu modifizieren ist als eine Vollmetallform. Jedoch bereitet das Ablösen des Formkörpers von einer solchen "Verbundform" Schwierigkeiten.In the field of brick production, the development in recent decades has gone from the pure metal mold made of solid material to composite molds, in which each mold half has a supporting part made of light metal or a light metal alloy, in particular an aluminum alloy, and a core made of synthetic resin, the side of which faces the mold cavity forms the negative form of the molded body to be produced. This side of the core is covered with a rubber blanket, which provides an insulating intermediate layer between the mold and the molded body to be pressed. per forms. The reason for the choice of synthetic resin for the production of the shaping cores was that synthetic resin is much easier and cheaper to modify than a solid metal mold when the molded body to be produced is modified. However, the detachment of the molded body from such a "composite shape" is difficult.
Bei der der wie beschrieben gestalteten Verbundform mit einem Stützteil aus Metall und mit einem Kunstharzkern als formgebendem Formteil und darüber gespanntem Gummituch besteht das Problem, daß weder Kunstharz noch Gummi elektrischen Strom leiten. Somit scheidet eine einfache Übernahme des bekannten Ablöseverfahrens mittels Elektro-Schockwirkung für solche Verbundformen aus.In the case of the composite mold designed as described with a supporting part made of metal and with a synthetic resin core as the shaping molded part and a rubber blanket stretched over it, there is the problem that neither synthetic resin nor rubber conduct electrical current. A simple takeover of the known detachment process by means of an electric shock effect is therefore ruled out for such composite shapes.
Der Erfindung liegt die Aufgabe zugrunde, eine Form zum Pressen von Formkörpern aus plastischen Massen zu schaffen, die Formhälften aus Verbundmaterial mit einem metallenen Stützteil und einen formgebenden Kern aus Kunstharz aufweist und gleichwohl durch Anlegen von elektrischem Strom ein Ablösen des gepreßten Formkörpers aus der Form erleichtert.The invention has for its object to provide a mold for pressing moldings made of plastic materials, the mold halves made of composite material with a metal support member and a shaping core made of synthetic resin and nevertheless facilitates detachment of the pressed molded body from the mold by applying electrical current .
Zur Lösung dieser Aufgabe dient Anspruch 1.To solve this problem, claim 1.
Bei der Form nach der Erfindung haben die beiden Randleisten der Formhälften in geschlossenem Zustand der Form einen durch die keramische Masse ausgefüllten Abstand voneinander. An eine der Randleisten und an die andere Formhälfte wird eine Spannungsquelle angeschlossen. Strom fließt dann von der Randleiste über die keramische Masse zwischen den beiden Randleisten, die zweite Randleiste und deren strom¬ leitende Verbindungen zu dem metallenen Stützteil der anderen Formhälfte. Dieser Vorgang kann durch Umpolen der Spannungsquelle , vorzugsweise einer Gleichspannungsquelle wiederholt werden. Überraschenderweise genügt die so durch "Elektro-Schocks" allein im Randbereich der Formhälften erzeugte Ablösewirkung zum Ablösen des Formkörpers von den Formhälften nach dem Preßvorgang.In the mold according to the invention, the two edge strips of the mold halves are spaced apart from one another by the ceramic mass when the mold is closed. A voltage source is connected to one of the edge strips and to the other half of the mold. Current then flows from the rim on the ceramic composition between the two edge strips, the second edge strip and the current ¬ conductive connections to the metal supporting part of the other mold half. This process can be carried out by reversing the polarity of the voltage source, preferably a DC voltage source be repeated. Surprisingly, the detachment effect produced by "electric shocks" only in the edge region of the mold halves is sufficient to detach the molded body from the mold halves after the pressing process.
Ein Verfahren zum Lösen von Formkörpern aus plastischen Massen aus einer Form gemäß Patentanspruch 1 hat erfindungsgemäß die Merkmale des Anspruchs 9.According to the invention, a method for releasing moldings from plastic materials from a mold has the features of claim 9.
Um Stromstöße gewünschter Dauer und Stärke auf die Oberform und die Unterform aufschalten zu können, wird eine Gleichspannungsquelle mit einer Spannung von vorzugsweise 60 V eingesetzt, deren Minuspol über ein Umschaltrelais nacheinander an die Randleiste der einen Formhälfte und die andere Formhälfte angelegt wird.In order to be able to connect current impulses of the desired duration and strength to the upper mold and the lower mold, a DC voltage source with a voltage of preferably 60 V is used, the negative pole of which is successively applied to the edge strip of one mold half and the other mold half via a changeover relay.
Die Randleisten bestehen beispielsweise aus Chrom-Nickel- Stahl.The edge strips are made of chrome-nickel steel, for example.
Vorzugweise sind die Randleisten in einem Bereich außerhalb des Formhohlraums angeordnet und umgeben somit den Formhohlraum.The edge strips are preferably arranged in an area outside the mold cavity and thus surround the mold cavity.
Die bei geschlossener Form in den Abstand zwischen den Randleisten in Form eines Streifens eingedrückte plastische Masse, welche eine Verbindung mit dem Formhohlkörper herstellt und bei Anlegen einer elektrischen Spannung den Strom über die Randleisten leitet, reicht überraschenderweise dazu aus, den Formhohlkörper von der betreffenden Formhälfte abzulösen. Der in dem Zwischenraum verbleibende streifenförmige Rest der plastischen Masse wird beim Öffnen der Form und Herausnehmen des Formkörpers von diesem abge¬ trennt oder fällt davon ab.The plastic mass pressed into the distance between the edge strips in the form of a strip when the mold is closed, which creates a connection with the mold hollow body and conducts the current over the edge strips when an electrical voltage is applied, is surprisingly sufficient to detach the hollow mold body from the relevant mold half . The remaining space in the intermediate strip-shaped rest of the plastic mass is when opening the mold and removing the molded body is separated from this abge ¬ or falls on it.
Vorteilhaft werden Luft und/oder Wasser aus dem Formhohl- räum durch Maßnahmen gemäß einem der Ansprüche 7 oder 8 abgesaugt.Air and / or water from the mold cavity are advantageous aspirated by measures according to one of claims 7 or 8.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.Further advantageous embodiments of the invention are specified in the subclaims.
Die Erfindung ist im folgenden anhand schematischer Zeichnungen an einem Ausführungsbeispiel mit weiteren Einzelheiten näher erläutert. Es zeigen:The invention is explained below with reference to schematic drawings of an embodiment with further details. Show it:
Fig. 1 einen Teilschnitt durch eine Form gemäß der Erfindung in geschlossenem Zustand,1 is a partial section through a mold according to the invention in the closed state,
Fig. 2 eine schematische Darstellung einer Trommelanordnung mit insgesamt fünf Unterformen und einer Oberform sowie eine Schaltungsanordnung zum Aufbringen von Spannungsstoßen auf die Unterform und die Oberform, die im einzelnen gemäß Fig. 1 ausgebildet sind.Fig. 2 is a schematic representation of a drum arrangement with a total of five lower molds and an upper mold and a circuit arrangement for applying voltage surges to the lower mold and the upper mold, which are designed in detail according to FIG. 1.
Gemäß Fig. 1 weist eine Oberform ein Stützteil 2 aus einer Aluminiumlegierung und einen Kern 4 aus Kunstharz auf, der formhohlraumseitig von einer Zwischenlage aus einer Gummimembran 6 überspannt ist. Eine Randleiste 8 aus Chrom- Nickel-Stahl ist mittels Senkkopfschrauben 10 gegen das Stützteil 2 und den Kern 4 unter Einspannung des Randes 12 des Gummituches 6 gespannt. Die Randleiste 8 läuft um die Form um.1, an upper mold has a support part 2 made of an aluminum alloy and a core 4 made of synthetic resin, which is spanned by an intermediate layer made of a rubber membrane 6 on the mold cavity side. An edge strip 8 made of chrome-nickel steel is stretched by means of countersunk screws 10 against the support part 2 and the core 4 while clamping the edge 12 of the rubber blanket 6. The edge strip 8 runs around the shape.
Die Unterform hat im Prinzip den gleichen Aufbau wie die Oberform, und ihre Bestandteile sind deshalb mit gleichen Bezugszahlen bezeichnet, die jedoch mit einem Strich indiziert sind. So hat die Unterform ein Stützteil 2' aus- einer Aluminiumlegierung, das mit einem Kern 41 aus Kunstharz ausgekleidet ist. Die Formhohlraumseite des Kernes 4 'ist von einer vorgeformten Gummimembran 6' bedeckt. Der Rand 12' dieser Gummimembran ist über eine Randleiste 8' mittels Senkkopfschrauben 10' mit dem Stützteil 2' verspannt. Die Senkkopfschrauben 10, 10' sind mit ihren Köpfen 11, 11* in den Randleisten 8, 8 'versenkt angeordnet.In principle, the lower mold has the same structure as the upper mold, and its components are therefore identified by the same reference numbers, which are, however, indicated with a line. For example, the lower mold has a support part 2 'made of an aluminum alloy, which is lined with a core 4 1 made of synthetic resin. The mold cavity side of the core 4 'is covered by a preformed rubber membrane 6'. The edge 12 'of this rubber membrane is clamped to the support part 2' via an edge strip 8 'by means of countersunk screws 10'. The countersunk screws 10, 10 'are recessed with their heads 11, 11 * in the edge strips 8, 8'.
Um das Gummituch 6 bzw. die Gummimembran 6' glatt und dicht an die Formhohlraumseite der Kerne 4, 4' angeschmiegt zu halten, sind Bohrungen 3, 3' in den Stützteilen 2, 2' vorgesehen, über welche eine Saugwirkung ausgeübt werden kann, die sich durch die porösen Kerne 4, 4' hindurch dem Gummituch 6 bzw. der Gummimembran 6' mitteilen kann.In order to keep the rubber blanket 6 or the rubber membrane 6 'smooth and tight against the mold cavity side of the cores 4, 4', holes 3, 3 'are provided in the support parts 2, 2' through which a suction effect can be exerted can communicate through the porous cores 4, 4 'to the rubber blanket 6 or the rubber membrane 6'.
Mindestens eines der Stützteile 2, 2', im gezeigten Ausführungsbeispiel das untere Stützteil 2', sowie der zugehörige Kern 4' mit aufgelegter Gummimembran 6' sind von Hohl- schrauben 16,17 durchsetzt, die über eine Schlauchanordnung 18 an einen Durchlaß 19 im Stützteil 2' zum Abführen von Luft und/oder Wasser aus dem Formhohlraum dicht angeschlossen sind.At least one of the support parts 2, 2 ', in the exemplary embodiment shown the lower support part 2', and the associated core 4 'with the rubber membrane 6' placed thereon are penetrated by hollow screws 16, 17 which are connected via a hose arrangement 18 to a passage 19 in the support part 2 'for discharging air and / or water from the mold cavity are tightly connected.
Alternativ können auch feine Öffnungen (nicht gezeigt) im Bereich der Löcher 3,3' in den Gummimembranen 6,6' vorgesehen sein, so daß dann ein Absaugen von Luft und/oder Wasser aus dem Formhohlraum über die Löcher 3,3' ermöglicht ist.Alternatively, fine openings (not shown) can also be provided in the region of the holes 3, 3 'in the rubber membranes 6, 6', so that air and / or water can then be sucked out of the mold cavity via the holes 3, 3 ' .
Im geschlossenen Zustand der Form gemäß Fig. 1 verbleibt ein Abstand zwischen den beiden parallelen Randleisten 8 , 8', der durch einen Streifen 14 von keramischem Material beim Preßvorgang eines Formkörpers 13, wie eines Dachziegelrohlings, zumindest teilweise ausgefüllt wird.In the closed state of the mold according to FIG. 1 there remains a distance between the two parallel edge strips 8, 8 ', which is at least partially filled by a strip 14 of ceramic material during the pressing process of a molded body 13, such as a roof tile blank.
Fig. 2 zeigt eine Trommelanordnung 20 mit fünf Unterformen mit Stützteilen 2' und einer in der obersten Lage befindlichen Oberform 2, die über eine Isolierung 21 von einem Preßstempel 22 beaufschlagt ist. Zwischen der Oberform und der Unterform ist ein Dachziegelrohling 13 dargestellt. Die Randleisten 8,8' sind ebenfalls angedeutet.FIG. 2 shows a drum arrangement 20 with five lower molds with supporting parts 2 'and an upper mold 2 located in the uppermost position, which is acted upon by a press ram 22 via insulation 21. Between the upper form and a roof tile blank 13 is shown in the lower mold. The edge strips 8,8 'are also indicated.
Ferner ist eine elektrische Schaltung umfassend eine Gleichspannungsquelle 24 dargestellt, welche über ein Umschaltrelais 26 einerseits mit der Randleiste 8 der Oberform und andererseits mit der Welle 28 der Trommelanordnung 20 und somit mit dem metallenen Stützteil 2 ' der Unterform elektrisch leitend verbunden ist.Furthermore, an electrical circuit comprising a DC voltage source 24 is shown, which is electrically conductively connected via a changeover relay 26 on the one hand to the edge strip 8 of the upper mold and on the other hand to the shaft 28 of the drum arrangement 20 and thus to the metal support part 2 'of the lower mold.
Über das Umschaltrelais 26 kann die Polung von Minuspol und Pluspol der Gleichstromquelle 24 umgeschaltet werden.The polarity of the negative pole and positive pole of the direct current source 24 can be switched via the changeover relay 26.
Im Betrieb wird nach abgeschlossenem Preßvorgang über den an der oberen Randleiste 8 angebrachten Minuspol der Spannungsquelle 24 ein Stromstoß der Gleichspannungsquelle für eine vorbestimmte, zweckmäßige Zeitdauer aufgebracht, um ein Lösen der oberen Formhälfte von der Oberseite des Dach- ziegelrohlinges 13 zu bewirken. Dann wird die Polung umgekehrt, so daß der Minuspol über die Welle 28 und die untere Formhälfte, d.h. das Stützteil 2', die Schrauben 10' und die Randleiste 8 ' in entgegengesetzter Richtung über den Streifen 14 zur Randleiste 8 in die obere Formhälfte fließt. Dadurch wird auch die untere Formhälfte von dem Ziegelrohling 13 gelöst. Nun kann ohne die Gefahr eines Anhaftens von Teilen des Formkörpers 13 an der Form die obere Formhälfte abgehoben und die Trommelanordnung 20 um einen Schritt in Pfeilrichtung weitergeschaltet werden, wobei dann der fertiggestellte Formkörper ohne die Gefahr der Beschädigung auch von der unteren Formhälfte abgehoben werden kann. In operation, after the pressing process has been completed, a current surge of the DC voltage source is applied for a predetermined, expedient period of time via the negative pole of the voltage source 24 attached to the upper edge strip 8 in order to cause the upper mold half to be detached from the top of the roof tile blank 13. Then the polarity is reversed, so that the negative pole via the shaft 28 and the lower mold half, i.e. the support part 2 ', the screws 10' and the edge strip 8 'flows in the opposite direction over the strip 14 to the edge strip 8 in the upper mold half. As a result, the lower mold half is detached from the brick blank 13. Now the upper mold half can be lifted off without the risk of parts of the molded body 13 adhering to the mold and the drum arrangement 20 can be advanced by one step in the direction of the arrow, in which case the finished molded body can also be lifted off the lower mold half without the risk of damage.

Claims

Patentansprüche claims
Form zum Pressen von Formkörpern aus plastischen Massen, insbesondere keramischem Material, mit zwei Formhälften, die jeweils ein Stützteil (2,2') aus Leichtmetall oder einer Leichtmetallegierung, und einen Kern (4,4') aus Kunstharz aufweisen und jeweils mit einem Pol einer elektrischen Spannungsquelle (24) verbindbar sind, wobei die Ränder der beiden Formhälften in geschlossenem Zustand der Form einen durch die plastische Masse ausgefüllten Abstand (14) voneinander haben, dadurch g e k e n n z e i c h n e t, daß jeder Kern (4,4') formhohlraumseitig von einer Zwischenlage (6,6') aus einem Elastomer, wie einem Gummituch (6) oder einer Gummimembran (6') abgedeckt ist, daß jede Zwischenlage (6,6') zwischen einer formhohlraumsei- tigen, metallenen Randleiste (8,8'), die mit der zugehörigen Formhälfte elektrisch leitend verbunden ist, und der Formhälfte eingespannt ist und daß der eine Pol der Spannungsquelle (24) über eine Randleiste (8 oder 8') und der andere Pol direkt mit der zugehörigen Formhälfte verbindbar sind.Mold for pressing molded articles made of plastic materials, in particular ceramic material, with two mold halves, each with a supporting part (2,2 ') made of light metal or a light metal alloy, and a core (4,4') made of synthetic resin, each with a pole an electrical voltage source (24) can be connected, the edges of the two mold halves being in the closed state of the mold at a distance (14) filled by the plastic mass, characterized in that each core (4, 4 ') on the mold cavity side is separated from an intermediate layer ( 6,6 ') made of an elastomer, such as a rubber blanket (6) or a rubber membrane (6'), that each intermediate layer (6,6 ') between a mold-side, metal edge strip (8,8'), the is electrically conductively connected to the associated mold half, and the mold half is clamped in and that the one pole of the voltage source (24) via an edge strip (8 or 8 ') and the other pole directly with d he associated mold half are connectable.
Form nach Anspruch 1, dadurch g e k e n n - - z e i c h n e t, daß die Randleiste (8,8') mit der zugehörigen Formhälfte (2,Mold according to claim 1, characterized in that the edge strip (8, 8 ') with the associated mold half (2,
2') über Schrauben (10,10') lösbar verbunden ist. 2 ') is detachably connected via screws (10, 10').
3. Form nach Anspruch 2 , dadurch g e k e n z e i c h n e t, daß die Schrauben (10,10') Senkköpfe (11,11') haben, die in die Randleisten (8,8') versenkt sind.3. Mold according to claim 2, characterized in that the screws (10, 10 ') have countersunk heads (11, 11') which are countersunk in the edge strips (8, 8 ').
4. Form nach einem der Ansprüche 1 bis 3, dadurch g e k e n n z e i c h n e t, daß die Randleisten (8,8') in einem Bereich außerhalb des Formhohlraumes angeordnet sind.4. Mold according to one of claims 1 to 3, characterized in that the edge strips (8, 8 ') are arranged in an area outside the mold cavity.
5. Form nach einem der Ansprüche 1 bis 4, dadurch g e k e n n z e i c h n e t, daß die Randleisten aus Chrom-Nickelstahl bestehen.5. Mold according to one of claims 1 to 4, characterized in that the edge strips consist of chrome-nickel steel.
6. Form nach einem der Ansprüche 1 bis 5 , dadurch g e k e n n z e i c h n e t, daß die beiden Formhälften mit zum Formhohlraum hin mündenden Löchern6. Mold according to one of claims 1 to 5, characterized in that the two mold halves with holes opening towards the mold cavity
(3; 3') zum Ansaugen der Zwischenlage (6,6') an die Formseite des Kerns (4,4*) mittels über die Löcher zugeführter Unterdruckluft versehen sind.(3; 3 ') for sucking the intermediate layer (6,6') onto the mold side of the core (4,4 *) are provided by means of vacuum air supplied via the holes.
7. Form nach Anspruch 6 , dadurch g e k e n n z e i c h n e t, daß die Zwischenlage (6, 6') im Bereich der Löcher (3; 3') mit feinen Öffnungen zum Durchlassen von Luft und Wasser ausgestattet sind, wobei Luft und/oder Wasser über die Löcher (3;3') absaugbar sind.7. Mold according to claim 6, characterized in that the intermediate layer (6, 6 ') in the region of the holes (3; 3') are equipped with fine openings for passage of air and water, air and / or water through the holes (3; 3 ') can be suctioned off.
8. Form nach einem der Ansprüche 1 bis 6, dadurch g e k e n n z e i c h n e t, daß mindestens eine der beiden Zwischenlagen (6') mittels Hohlschrauben8. Mold according to one of claims 1 to 6, characterized in that at least one of the two intermediate layers (6 ') by means of banjo bolts
(16,17) an der zugehörigen Formhälfte (2', 4') gehalten ist, wobei über diese Hohlschrauben Luft und Wasser aus dem Formhohlraum abgeführt werden können. Verfahren zum Lösen von Formkörpern aus plastischen Massen aus einer Form nach einem der Ansprüche 1 bis 8, dadurch g e k e n n z e i c h n e t, daß die Pole einer Gleichspannungsquelle (24) mittels eines Umschaltrelais (26) abwechselnd an die eine Randleiste (8,8') und die andere Formhälfte (2 ',2) angelegt werden, wobei jeweils für eine vorbestimmte, zweckmäßige Zeitdauer ein Stromstoß aufgebracht wird. (16, 17) is held on the associated mold half (2 ', 4'), air and water being able to be discharged from the mold cavity via these banjo bolts. Method for releasing molded articles from plastic masses from a mold according to one of Claims 1 to 8, characterized in that the poles of a DC voltage source (24) are alternately connected to one edge strip (8, 8 ') and the other by means of a changeover relay (26) Mold half (2 ', 2) are applied, wherein a current surge is applied in each case for a predetermined, expedient period of time.
PCT/EP1998/001736 1997-03-27 1998-03-24 Mold for compressing shaped bodies from plastic masses WO1998043793A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP1998/001736 WO1998043793A1 (en) 1997-03-27 1998-03-24 Mold for compressing shaped bodies from plastic masses

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP19970105311 EP0868985B1 (en) 1997-03-27 1997-03-27 Mould for pressing articles from plastic masses
EP97105311.1 1997-03-27
PCT/EP1998/001736 WO1998043793A1 (en) 1997-03-27 1998-03-24 Mold for compressing shaped bodies from plastic masses

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WO1998043793A1 true WO1998043793A1 (en) 1998-10-08

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0919344A2 (en) * 1997-10-10 1999-06-02 Rieter-Werke GmbH & Co. KG Die , in particular for pressing roof tiles
EP1961537A3 (en) * 2007-02-21 2010-09-08 Bongioanni Stampi S.r.l. Mold for forming clay tiles and method for obtaining said mold

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR25418E (en) * 1921-09-27 1923-03-07 Deburring molds for flat tiles
DE1224649B (en) * 1961-01-12 1966-09-08 Jean Barnier Laurenties Hollow mold for molding ceramic bodies
GB2067461A (en) * 1980-01-23 1981-07-30 Hutschenreuther Process for the manufacture of dry-pressed mouldings and apparatus for carrying out this process
DE8618713U1 (en) * 1986-07-12 1986-09-18 Ottensteiner Kunststoff GmbH, 4422 Ahaus Press mold for roof tiles
EP0250012A2 (en) * 1986-06-18 1987-12-23 Fonderie Officine Meccaniche BONGIOANNI S.p.A. System of fixing the elastomeric membrane to the upper die for ceramic products
EP0505296A1 (en) * 1991-03-21 1992-09-23 L'industrielle Regionale Du Batiment Method for making articles from a mouldable material in wet paste form, and press mould to carry out the method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR25418E (en) * 1921-09-27 1923-03-07 Deburring molds for flat tiles
DE1224649B (en) * 1961-01-12 1966-09-08 Jean Barnier Laurenties Hollow mold for molding ceramic bodies
GB2067461A (en) * 1980-01-23 1981-07-30 Hutschenreuther Process for the manufacture of dry-pressed mouldings and apparatus for carrying out this process
EP0250012A2 (en) * 1986-06-18 1987-12-23 Fonderie Officine Meccaniche BONGIOANNI S.p.A. System of fixing the elastomeric membrane to the upper die for ceramic products
DE8618713U1 (en) * 1986-07-12 1986-09-18 Ottensteiner Kunststoff GmbH, 4422 Ahaus Press mold for roof tiles
EP0505296A1 (en) * 1991-03-21 1992-09-23 L'industrielle Regionale Du Batiment Method for making articles from a mouldable material in wet paste form, and press mould to carry out the method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0919344A2 (en) * 1997-10-10 1999-06-02 Rieter-Werke GmbH & Co. KG Die , in particular for pressing roof tiles
EP0919344A3 (en) * 1997-10-10 2000-06-21 Rieter-Werke GmbH & Co. KG Die , in particular for pressing roof tiles
EP1961537A3 (en) * 2007-02-21 2010-09-08 Bongioanni Stampi S.r.l. Mold for forming clay tiles and method for obtaining said mold

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