EP0865888B1 - Matrice pour le pressage isostatique de carreaux en céramique et méthode de fabrication de cette matrice - Google Patents

Matrice pour le pressage isostatique de carreaux en céramique et méthode de fabrication de cette matrice Download PDF

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Publication number
EP0865888B1
EP0865888B1 EP98104765A EP98104765A EP0865888B1 EP 0865888 B1 EP0865888 B1 EP 0865888B1 EP 98104765 A EP98104765 A EP 98104765A EP 98104765 A EP98104765 A EP 98104765A EP 0865888 B1 EP0865888 B1 EP 0865888B1
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EP
European Patent Office
Prior art keywords
insert
positioning means
elastic positioning
punch
punch according
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.)
Expired - Lifetime
Application number
EP98104765A
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German (de)
English (en)
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EP0865888A1 (fr
Inventor
Nunzio Annovi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Annovi Srl
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Annovi Srl
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Filing date
Publication date
Application filed by Annovi Srl filed Critical Annovi Srl
Publication of EP0865888A1 publication Critical patent/EP0865888A1/fr
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Publication of EP0865888B1 publication Critical patent/EP0865888B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
    • B30B15/022—Moulds for compacting material in powder, granular of pasta form
    • B30B15/024—Moulds for compacting material in powder, granular of pasta form using elastic mould parts
    • 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
    • B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
    • B28B3/024—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form the pressure on the material being transmitted through flexible or resilient wall parts, e.g. flexible cushions on the ramming surface, resilient wall parts pressing as a result of deformation caused by ram pressure
    • 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
    • B28B7/346—Manufacture of moulds

Definitions

  • the invention concerns an isobaric punch for pressing ceramic tiles and a method for making said punch.
  • dies for ceramic tiles comprising a punch body provided with a plurality of intercommunicating cavities containing oil, said cavities being closed at an active end by an elastic membrane; inside each cavities a respective piston, peripherally provided with a sealing ring, is interposed between the oil and the membrane.
  • isobaric dies are also known, in which membrane control elements are provided, instead of pistons, which are kept at an intermediate position in the respective cavities by means of positioning elements which are squashed, or broken, or somehow neutralized, after the vulcanization of the membrane, thus releasing the control elements which are so free to move towards the powders to be pressed, or in opposite direction, due to the action, respectively, of the oil, or of the powders.
  • positioning elements made of elastic material are described, which are interposed between the bottom of each cavity and the central portion of each control element.
  • the control elements may be relatively unstable and, sometimes, may tend to block in the respective cavities when they are non uniformly stressed by the powders.
  • the particular allocation of the elastic positioning elements makes necessary to carry out the vulcanization with the cavities turned downwards, to avoid the fluid material, from which the membrane will be made, filling said cavities completely.
  • Aim of the present invention is to improve the dies for pressing ceramic powders eliminating the drawbacks indicated above.
  • said elastic means are received in a corresponding annular seat provided in said bottom portion.
  • each rigid insert has a central zone and a peripheral zone, the peripheral zone having a thickness which is less than the thickness of the central zone.
  • a peripheral sealing element is interposed between each rigid insert and the membrane, to avoid the leakages of liquid plastic material during vulcanization.
  • sealing means are located on the rigid inserts, said sealing means being suitable to prevent portions of said material from penetrating into said cavities, during vulcanization.
  • An isobaric punch 1 for pressing ceramic tiles 2 inside a matrix 3, comprises an elastic membrane 4 vulcanized on the outer face of the punch and reproducing, in negative, the back side of the tile 2.
  • the punch 1 is provided with a plurality of cavities 5, obtained in the punch body in the areas amongst supporting appendixes 6 of the tile.
  • the membrane 4 is provided with corresponding grooves 7 corresponding to the appendixes 6.
  • the cavities 5 are intercommunicating through a series of holes 8 obtained in the punch body in such a way as to form a circuit, closed by a screw cap 13, wherein some oil is injected.
  • each cavity 5 there is accommodated a respective insert 9 which is free to move, during pressing, towards the tile 2, or away from it, depending on the local density of the powders forming the said tile.
  • Each insert 9 has, preferably, an edge portion 10 having a reduced thickness, to avoid blockings even when the combined action of the powders and of the oil forces the insert to tilt with respect to the relevant cavity 5.
  • annular shaped elastic means 11 for example consisting of a ring having circular section and preferably inserted into an annular seat 12 of each cavity.
  • the annular shaped elastic means 10 acts itself as a gasket element when, in making the punch, a liquid resin is poured onto the inserts and onto the free surface of the punch body to form the membrane 4.
  • each insert may be directly in contact with the membrane 4 without interposition of any gasket element.
  • each insert 4 with a disk-shaped gasket element 14, which is located on each insert before the resin being poured, or before the rubber being applied.
  • the gasket element may consist of a ring 15 like the annular shaped elastic means 11, so as to obtain a reduction of the variety of pieces forming the punch 1.
  • Figure 5 shows that the disk-shaped gasket element 14 may have a central hole 16 to facilitate anchoring of the membrane 4 to the respective insert, so that, when it is necessary to remove the membrane for regenerating the die, the inserts stay attached to the membrane and follow it, so emptying automatically the respective cavities.
  • each insert 9 may have, upon its face facing the membrane 4, a depression 17, which is advantageously truncated-cone shaped, for further improving anchoring of the membrane to the inserts 9.
  • the depression 17 may extend up to the periphery of the insert 9, so defining a raised edge 18 which may be wrapped up by a lip 19 of the elastic medium underneath, which includes, for example, a ring 20 with rectangular section.
  • the presence of the lip 19 constitutes a further guarantee against blocking of the insert 9 in the respective cavity 5, because it makes even impossible any contact between the insert and the lateral walls of the cavity, avoiding, in this way, blockings or seizures.
  • the annular shaped elastic means 20 may even not require the presence of the raised edge 18 of the insert 9, i.e. the lip 19 may simply wrap up the outer peripheral surface of the insert 9.
  • the cavities may be made communicating with each other by means of through-openings 21 obtained on the walls 22 which define the cavities 6, or by means of holes 24 converging in a V-shaped formation.
  • the elastic means may have a semicircular section 23, in such a way as to have greater yieldingness during pressing.
  • the various forms of cross section of the elastic means make the insert 9 more or less freely movable.
  • an insert with circular section may enter the respective cavity owing to forces which are less than forces that should be required if the insert would be provided with a rectangular or square section having corresponding dimensions.
  • the elastic means in its various versions, should substantially not alter its form and dimensions during the vulcanization of the membrane 4, so that the inserts 9 are allowed to stay in an intermediate position in the respective cavity up to solidification of the membrane 4.
  • the form of the inserts 9 and of their respective edge 10 having less thickness, is such that the central portion protrudes towards the bottom of the cavity 5.
  • the central portion may constitute a stop means of the motion of the insert towards the bottom of the cavity to prevent the elastic means from being damaged.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)

Claims (16)

  1. Poinçon isobare (1) pour le pressage de carreaux de céramique (2), comprenant un corps de poinçon muni de cavités (5) en intercommunication contenant un fluide incompressible et ayant une extrémité fermée par une membrane élastique (4), l'autre extrémité étant munie d'une portion de fond, un insert rigide respectif (9), coopérant avec un moyen de positionnement élastique respectif (11 ; 20 ; 23), étant reçu à l'intérieur de chaque cavité (5), ledit insert rigide ayant une zone centrale et une zone périphérique avec une portion de bordure, ledit insert (9) faisant face, sur un premier côté, à ladite membrane (4), et, sur le côté opposé, étant en contact avec le moyen de positionnement élastique respectif (11 ; 20 ; 23), caractérisé en ce que ledit moyen de positionnement élastique (11 ; 20 ; 23) possède une forme annulaire et est reçu entre ladite portion de bordure et le fond de la cavité respective, ledit moyen de positionnement élastique étant configuré de manière à coopérer activement avec ledit insert rigide pendant le pressage des carreaux de céramique.
  2. Poinçon selon la revendication 1, caractérisé en ce que ledit moyen de positionnement élastique (11 ; 20 ; 23) est reçu dans un siège annulaire correspondant (12) de ladite cavité (5).
  3. Poinçon selon la revendication 1 ou 2, caractérisé en ce que ledit moyen de positionnement élastique a une section transversale circulaire (11).
  4. Poinçon selon la revendication 1 ou 2, caractérisé en ce que ledit moyen de positionnement élastique a une section transversale rectangulaire (20).
  5. Poinçon selon la revendication 1 ou 2, caractérisé en ce que ledit moyen de positionnement élastique a une section transversale comportant au moins une portion semi-circulaire (23).
  6. Poinçon selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit moyen de positionnement élastique (11 ; 20 ; 23) a une lèvre (19) enveloppant périphériquement l'insert respectif (9).
  7. Poinçon selon la revendication 1, caractérisé en ce que ledit insert (9) possède un creux (17) pour recevoir la membrane (4) et pour s'y ancrer lui-même.
  8. Poinçon selon la revendication 1, caractérisé en ce que ledit insert possède une zone périphérique (10) ayant une épaisseur moindre que l'épaisseur de la zone centrale.
  9. Poinçon selon la revendication 1, caractérisé en ce que ledit insert possède une zone centrale qui saille en direction de ladite portion de fond afin de constituer une surface de butée lorsque l'insert est poussé dans la cavité (5).
  10. Poinçon selon l'une quelconque des revendications précédentes, caractérisé en ce qu 'un élément d'étanchéité périphérique (14 ; 15) est interposé sur le côté dudit insert (9), entre l'insert et la membrane (4).
  11. Poinçon selon la revendication 10, caractérisé en ce que ledit élément d'étanchéité périphérique (14 ; 15) est formé par une bague ayant des dimensions et une forme identiques à celles dudit moyen élastique (11 ; 20 ; 23).
  12. Poinçon selon la revendication 10, caractérisé en ce que ledit élément d'étanchéité périphérique comprend un élément (14) ayant, dans une vue en plan, la même forme que la cavité respective (5) et étant insérable en force dans celle-ci.
  13. Poinçon selon la revendication 12, caractérisé en ce que ledit élément d'étanchéité est muni d'une ouverture centrale (16).
  14. Procédé de fabrication d'un moule isobare (1) pour des carreaux de céramique (2) comprenant, en séquence, la préparation d'un corps de moule avec des cavités (5) en intercommunication ayant des ouvertures respectives orientées vers le haut, l'insertion d'un moyen de positionnement élastique (11 ; 20 ; 23) et d'un insert rigide respectif (9) dans chaque cavité (5), ledit insert rigide ayant une zone centrale et une zone périphérique avec une portion de bordure, et la vulcanisation d'une membrane (4) de matériau élastique sur les inserts rigides (9) et sur ledit corps de moule, caractérisé en ce que le moyen de positionnement élastique (11 ; 20 ; 23) possède une forme annulaire et est reçu entre ladite portion de bordure et le fond de la cavité respective, ledit moyen de positionnement élastique étant configuré de manière à coopérer activement avec ledit insert rigide pendant le pressage des carreaux de céramique.
  15. Procédé selon la revendication 14, caractérisé en ce qu 'un élément d'étanchéité (14 ; 15) est situé sur les inserts rigides (9) avant ladite vulcanisation, pour éviter que, pendant ladite vulcanisation, des portions dudit matériau ne puissent pénétrer dans lesdites cavités (5).
  16. Procédé selon la revendication 14 ou 15, caractérisé en ce qu 'une pression est exercée sur les éléments rigides (9) pendant la vulcanisation, ladite pression étant propre à ne pas déformer les éléments élastiques de positionnement (11 ; 20 ; 23).
EP98104765A 1997-03-18 1998-03-17 Matrice pour le pressage isostatique de carreaux en céramique et méthode de fabrication de cette matrice Expired - Lifetime EP0865888B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMO970043 1997-03-18
IT97MO000043A IT1292690B1 (it) 1997-03-18 1997-03-18 Punzone isobarico per la pressatura di piastrelle ceramiche e metodo per la fabbricazione di detto punzone.

Publications (2)

Publication Number Publication Date
EP0865888A1 EP0865888A1 (fr) 1998-09-23
EP0865888B1 true EP0865888B1 (fr) 2003-08-13

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Application Number Title Priority Date Filing Date
EP98104765A Expired - Lifetime EP0865888B1 (fr) 1997-03-18 1998-03-17 Matrice pour le pressage isostatique de carreaux en céramique et méthode de fabrication de cette matrice

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EP (1) EP0865888B1 (fr)
DE (1) DE69817049D1 (fr)
IT (1) IT1292690B1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMO20020264A1 (it) * 2002-09-24 2004-03-25 Alfredo Missana Semistampo per la pressatura unidirezionale di materiali
WO2006095254A2 (fr) * 2005-03-09 2006-09-14 Mira Di Algeri Maris Dispositif de compression isostatique
ITMI20111917A1 (it) * 2011-10-24 2013-04-25 Martinelli Ettore Srl Tampone adattativo per la pressatura di prodotti ceramici, quali piastrelle e simili
WO2020058906A1 (fr) * 2018-09-19 2020-03-26 Siti - B&T Group S.P.A. Procédé pour la fabrication de dalles de matériau céramique et/ou pierreux
IT202100014210A1 (it) * 2021-05-31 2022-12-01 Annovi S R L Tampone isostatico per la pressatura di polveri ceramiche

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1269262B (it) * 1994-09-13 1997-03-26 Maris Algeri Stampo isobarico per la pressatura di piastrelle ceramiche, e metodo relativo
EP0759346B1 (fr) * 1995-08-18 2001-11-21 Carlo Antonio Camorani Matrice pour le pressage isostatique

Also Published As

Publication number Publication date
ITMO970043A1 (it) 1998-09-18
DE69817049D1 (de) 2003-09-18
IT1292690B1 (it) 1999-02-11
EP0865888A1 (fr) 1998-09-23

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