EP1716998B1 - Verdichtungsüberwachungsvorrichtung und -Verfahren für eine isostatische Presse - Google Patents

Verdichtungsüberwachungsvorrichtung und -Verfahren für eine isostatische Presse Download PDF

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Publication number
EP1716998B1
EP1716998B1 EP06075716A EP06075716A EP1716998B1 EP 1716998 B1 EP1716998 B1 EP 1716998B1 EP 06075716 A EP06075716 A EP 06075716A EP 06075716 A EP06075716 A EP 06075716A EP 1716998 B1 EP1716998 B1 EP 1716998B1
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EP
European Patent Office
Prior art keywords
oil
air space
mould
compaction
valve
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Application number
EP06075716A
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English (en)
French (fr)
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EP1716998A3 (de
EP1716998A2 (de
Inventor
Marco c/o SACMI Coop. MECCANICI IMOLA SC Salieri
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Sacmi Imola SC
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Sacmi Imola SC
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Priority to PL06075716T priority Critical patent/PL1716998T3/pl
Publication of EP1716998A2 publication Critical patent/EP1716998A2/de
Publication of EP1716998A3 publication Critical patent/EP1716998A3/de
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Publication of EP1716998B1 publication Critical patent/EP1716998B1/de
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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
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/003—Pressing by means acting upon the material via flexible mould wall parts, e.g. by means of inflatable cores, isostatic presses
    • 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
    • B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
    • B28B17/0063—Control arrangements
    • B28B17/0081—Process control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
    • B30B5/02—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of a flexible element, e.g. diaphragm, urged by fluid pressure

Definitions

  • the present invention refers to an apparatus and method for controlling the compaction of the powder in a ceramic mould by means of a punch of isostatic type according to the pre-amble of claims 1, 5 respectively.
  • one of the punches of the normal ceramic mould comprises a metallic base in which an air space is defined. This air space is closed by a deformable membrane intended to come into contact with the powder and filled by means of a liquid, generally oil.
  • the air space may comprise a grid which defines a series of intercommunicating cells, to whose upper edge the membrane is fixed.
  • the filling of the air space by means of oil occurs by adjusting the pressure inside the punch, causing an elastic deformation of the membrane which remains in contact with the top of the grid, to which it is fixed.
  • Variations of the isostatic mould are known in which the membrane is supported at the metallic base and bound to the same only at distributed zones, so to define adjacent and communicating areas in which the membrane is simply supported at the metallic base.
  • the known isostatic moulds often foresee that the isostatic punch equipped with membrane is the lower punch of the mould, which defines the base of the mould cavity wherein the powder to be pressed is received.
  • the oil modifies its own chemical-physical characteristics following aging, and may become aggressive over time with regards to the membrane: taking into account the very high stress to which it is subjected, which may reach hundreds of Kg per square cm, this phenomenon considerably shortens the life of the mould.
  • the elastic action of the punch may cause defects or breaking of the tile itself.
  • the swellings of the membrane project beyond the upper face of the mould matrix, and are rubbed by the exiting tile, with premature localised wear and deterioration.
  • JP 2003 260600 discloses an apparatus for controlling the compaction of the powder in a ceramic mould according to the pre-amble of claim 1 and shows a system to feed oil under pressure to a mould for printing integrated circuit cards.
  • Such apparatus comprises a double cylinder piston group, composed of two cylinders, the cylinder being positioned in series and each of the cylinders presenting two parts and both cylinders having a common shaft.
  • the cylinder which is upward with respect to the mould, is a double effect cylinder and can act both ways in a compressing and an expanding fashion.
  • the hydraulic circuit is divided in two parts, since the branch of the circuit that is connected to the mould is utilized by a thermal oil, while the rest of the circuit, which is fluidically separated from the branch containing thermall oil, contains another kind of oil Also, downward from the cylinder acting directly on the mould there is no blocking valve. By consequence during pressing operation, the pressure in the mould acts back upon the cylinder.
  • GB 1 234 978 shows a ram that during the pressing cycle can be stopped in a plurality of operative positions.
  • Feeding of the oil to the ram is regulated by a control system to which information on the positions of the ram are fed.
  • a control system to which information on the positions of the ram are fed.
  • Such device provides for position transducers such as a potentiometer that generates an electric signal corresponding to the setting of the pump that actuates the ram and an indicatorof the position of the ram.
  • Such press however is not an isostatic press.
  • Oil pressure is fed from a pump that is associated with a tank and the hydraulic circuit is opened and closed swiftly by means of a device that actuates a valve that opens and closes the admission of oil to the cylinder. In such fashion a variable and pulsing pressure is created on the elastic membranes.
  • EP 0 659 572 shows a method and apparatus for fabricating ceramic with an isostatic mould.
  • An hydraulic cylinder piston group that actuates an hydraulic press is present connected to an hydraulic circuit which in turn provides for a valvolar group and a pressure multiplier.
  • the valve is opened when a pressure is inferior to maximal exercise pressure of the hydraulic cylinder piston group, while opening in the opposite way of the valvolar group is acted upon during repositioning of the pressure multiplier. In such a way, below the membrane in the zone comprised between the print in which the tile feet are formed, a hydraulic pressure is achieved that is sufficient to rise the tile in the final phases of pressing.
  • US 4 718 842 shows a press having a position transducer and optoelectronic means for referencing the position of a first plate of the press.
  • the object of the present invention is to eliminate the above mentioned drawbacks in the scope of a simple and economical solution.
  • the pressing system according to the finding foresees the use of an isostatic mould of substantially known type, associated with means of feeding and control of the oil contained in the same.
  • Said means of feeding and control comprise a volumetric metering device adapted, at every pressing cycle, to insert a precise and desired volume of oil in the punch, means adapted to discharge all of the oil contained in the punch at every pressing cycle and finally means to send towards an oil tank contained inside the pad, with the modes defined here below.
  • the operator decides the metered quantity of oil which must be present in the pad.
  • the quantity of oil contained in the punch is equal to zero, or is in any case such to not deform the elastic membrane.
  • the desired volume of oil is inserted into the mould, so that it is in normal operating configuration at the time it receives the impact of the compaction, and distributes the compaction pressure in isostatic manner.
  • Fig. 1 schematically illustrates an isostatic punch according to the finding with related hydraulic diagram.
  • the punch 1 is inserted in a mould of which one sees only the matrix 2; the known anti-wear plates 11 are peripherally fixed to this matrix, flush to the upper edge.
  • the punch comprises a metallic body 10.
  • the upper surface of the body 10 has a network of grooves 12, and a corresponding network of conduits 13 whose vertical segments lead to the centre of the areas defined by the grooves.
  • the conduits 13 lead to a single collector 14 which leads laterally outside the body 10.
  • the areas defined by the grooves 12 are covered by an anti-stick substance before they are cast and the elastic membrane 3 vulcanised or polymerised in situ; the elastic membrane thus results adherent to the metallic body only at the grooves and along the periphery.
  • the powder 4 to be compressed is supported on the membrane 3.
  • oil When oil is inserted through the conduits 13, it is distributed in the areas between the grooves, swelling the overlying membrane which thus endows the punch with the isostatic property.
  • the volumetric metering device 5 is represented in the figure, schematised as a cylinder 51, wherein a sealed piston 52 slides, dividing the inside of the cylinder into two chambers 54 and 55.
  • the stem 53 is associated with a detection and measurement device 56 of the piston translations, which define the volume of oil fed by the metering device.
  • the chamber 54 of the cylinder is connected to an oil tank 6 by means of the pump 7 and the valve 81.
  • the chamber 55 of the metering device is connected to the collector 14 with the interposition of a valve 82, and to the tube which connects the pump 7 and the valve 81 with the interposition of the valve 83.
  • the collector 14 is directly connected to the tank 6 with the interposition of a two-way valve 84.
  • the operation of the device is as follows.
  • the system configuration illustrated in the figure corresponds to the raised position of the upper cross member of the press, not illustrated.
  • the operator decides beforehand the volume of the oil which he wishes to insert in the punch based on the pad's geometry, appropriately reading the device 56 which is a position transducer, and making sure that the tubing and the chambers 54 and 55 of the metering device are full of oil.
  • valves 81, 82, 83 and 84 together with the device 56 are connected to the mould's control system, for example a PLC, which regulates the following operations in relation with the cycle step of the press.
  • the mould's control system for example a PLC
  • the pump feeds oil under pressure into the chamber 54 of the metering device and the piston moves, transferring the oil contained in the chamber 55 of the metering device to the inside of the mould.
  • valve 81 slide is repositioned in the centre, the valve 82 slide repositioned to the left.
  • the punch is insulated from the metering device and acts like a normal isostatic punch in the subsequent pressing steps.
  • the control system waits for the punch to be completely discharged by means of the position transducer 56, then the valve 82 slide is repositioned to the left, the valve 81 slide is repositioned in the centre and the press cycle continues normally.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Press Drives And Press Lines (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Reciprocating Pumps (AREA)

Claims (5)

  1. Vorrichtung zum Steuern der Verdichtung des Pulvers in einer Pressform für Keramik mit Hilfe eines isostatischen Stempels, der einen Luftzwischenraum umfasst, in dem sich eine zum Stützen der elastischen Pressmembran ausreichende Ölmenge befindet, dadurch gekennzeichnet, dass der Luftzwischenraum durch eine Volumendosiervorrichtung (5) in Verbindung mit einem Tank (6) und einer Speisepumpe (7) steht, welche die gewünschte Ölmenge zum Luftzwischenraum der Pressform schickt, wobei diese Dosiervorrichtung mit Mitteln zum Detektieren und Auslesen (56) der zum Luftzwischenraum der Pressform geschickten Ölmenge und mit Ventilmitteln (81, 82, 83) zum Fördern, Blockieren und Ablassen des Öls zum, im bzw. aus dem Luftzwischenraum der Pressform verbunden ist, um zu gewährleisten, dass sich in diesem Luftzwischenraum ein für jeden Schritt des Verdichtungszyklus vorbestimmtes Ölvolumen befindet.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Luftzwischenraum der Pressform unter Ausschaltung der Dosiervorrichtung (5) durch ein Ventil (84) in direkter Verbindung mit dem Öltank (6) steht.
  3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Dosiervorrichtung (5) aus einem Zylinder besteht, der durch einen Kolben (52) in zwei Abschnitte (54, 55) aufgeteilt wird, von denen der eine (54) durch ein Drei-Wege-Ventil (81) mit der Pumpe (7) verbunden ist, während der andere (55) durch ein Zwei-Wege-Ventil (82) mit dem Luftzwischenraum der Pressform und durch ein Zwei-Wege-Ventil (83) mit der Förderleitung der Pumpe (7) verbunden ist.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass der Kolben (52) einen Schaft umfasst, der mit einem Wegaufnehmer (56) verbunden ist.
  5. Verfahren zum Steuern der Verdichtung von Pulvern in einer Pressform für Keramik mit Hilfe eines einen Luftzwischenraum, in dem sich eine Ölmenge befindet, umfassenden isostatischen Stempels unter Verwendung der Vorrichtung nach einem der Ansprüche 1 bis 4, das die folgenden Vorgänge umfasst:
    - Fördern einer zum Stützen der elastischen Pressmembran ausreichenden dosierten Ölmenge in den Luftzwischenraum;
    - Schritt zum Laden des Pulvers in den Formhohlraum und Ausführung eines ersten Schritts zum geringfügigen Verdichten, der dem Schritt zum Entgasen des Pulvers entspricht;
    - Einleiten in den Luftzwischenraum eines gewünschten dosierten Ölvolumens derart, dass es sich zu dem Zeitpunkt, in dem es für die Endverdichtung beaufschlagt wird, in der normalen Arbeitskonfiguration befindet und den Verdichtungsdruck auf isostatische Weise verteilt;
    - Entfernen aus dem Luftzwischenraum zumindest des zuvor eingeleiteten Öls, das sich wieder im Anfangszustand befindet.
EP06075716A 2005-04-26 2006-03-28 Verdichtungsüberwachungsvorrichtung und -Verfahren für eine isostatische Presse Active EP1716998B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06075716T PL1716998T3 (pl) 2005-04-26 2006-03-28 Aparat i sposób do sterowania prasowaniem za pomocą form izostatycznych

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000042A ITRE20050042A1 (it) 2005-04-26 2005-04-26 Sistema di controllo compattazione mediante stampi isostatici

Publications (3)

Publication Number Publication Date
EP1716998A2 EP1716998A2 (de) 2006-11-02
EP1716998A3 EP1716998A3 (de) 2007-11-07
EP1716998B1 true EP1716998B1 (de) 2011-09-07

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EP06075716A Active EP1716998B1 (de) 2005-04-26 2006-03-28 Verdichtungsüberwachungsvorrichtung und -Verfahren für eine isostatische Presse

Country Status (6)

Country Link
EP (1) EP1716998B1 (de)
CN (1) CN1853890A (de)
ES (1) ES2371769T3 (de)
IT (1) ITRE20050042A1 (de)
PL (1) PL1716998T3 (de)
RU (1) RU2441750C2 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101045313B (zh) * 2007-03-16 2010-06-09 吴锐光 一种陶瓷压机用的节能方法及其装置
ITMO20080040A1 (it) * 2008-02-15 2009-08-16 Sacmi Apparato e metodo di pressatura
IT201700050342A1 (it) * 2017-05-10 2018-11-10 Gape Due S P A Stampo ad elevata controllabilita'
CN108818883B (zh) * 2018-07-09 2023-11-14 广东天恒液压机械有限公司 陶瓷压机电液控制方法及系统
ES2745575A1 (es) * 2018-08-30 2020-03-02 Asitec Ceram S L Punzon isostatico

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1759357B2 (de) 1968-04-24 1977-09-01 Brück, Schlösser & Co GmbH, 4500 Osnabrück Hydraulische presse zum pressen von kunststeinen
FR2570020B1 (fr) 1984-09-11 1988-07-22 Commissariat Energie Atomique Presse automatique
DE4320203A1 (de) 1993-06-18 1994-12-22 B & B Maschinenbau Gmbh Wandung für eine Preßform und eine eine derartige Wandung einbeziehende Preßeinrichtung und Preßform
IT1262344B (it) * 1993-12-21 1996-06-19 Mass Spa Metodo e impianto per la formatura di piastrelle a compattazione e spessore uniformi, e piastrelle cosi' ottenute.
JP3381348B2 (ja) 1993-12-27 2003-02-24 セイコーエプソン株式会社 プリンタ
JP4175819B2 (ja) 2002-03-11 2008-11-05 北川精機株式会社 プレス装置およびプレス装置の制御方法

Also Published As

Publication number Publication date
RU2006113028A (ru) 2008-05-27
ITRE20050042A1 (it) 2006-10-27
EP1716998A3 (de) 2007-11-07
EP1716998A2 (de) 2006-11-02
ES2371769T3 (es) 2012-01-09
CN1853890A (zh) 2006-11-01
RU2441750C2 (ru) 2012-02-10
PL1716998T3 (pl) 2012-02-29

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