EP0995562A1 - Dispositif pour la fabrication d'éléments en céramique tels que carreaux et produits similaires par pressage de poudre - Google Patents

Dispositif pour la fabrication d'éléments en céramique tels que carreaux et produits similaires par pressage de poudre Download PDF

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Publication number
EP0995562A1
EP0995562A1 EP98119426A EP98119426A EP0995562A1 EP 0995562 A1 EP0995562 A1 EP 0995562A1 EP 98119426 A EP98119426 A EP 98119426A EP 98119426 A EP98119426 A EP 98119426A EP 0995562 A1 EP0995562 A1 EP 0995562A1
Authority
EP
European Patent Office
Prior art keywords
active surface
upper body
powder layer
support
shaping frame
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.)
Withdrawn
Application number
EP98119426A
Other languages
German (de)
English (en)
Inventor
Franco Stefani
Franco Gozzi
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.)
Ronflette Sa C/o System SpA
Ronflette SA
Original Assignee
Ronflette Sa C/o System SpA
Ronflette SA
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
Application filed by Ronflette Sa C/o System SpA, Ronflette SA filed Critical Ronflette Sa C/o System SpA
Priority to EP98119426A priority Critical patent/EP0995562A1/fr
Publication of EP0995562A1 publication Critical patent/EP0995562A1/fr
Withdrawn legal-status Critical Current

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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
    • B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
    • B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
    • B28B13/0215—Feeding the moulding material in measured quantities from a container or silo
    • 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
    • B28B3/021—Ram heads of special form
    • 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
    • B28B3/027—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 using a bottom press ram actuated upwardly towards mould covers
    • 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 invention relates particularly to products obtained through pressing ceramic powders or materials having prevalently plastic characteristics.
  • the invention is usefully applied to the formating of ceramic tiles.
  • the prior art in the field of forming ceramic tiles is based on the use of dies inserted into presses.
  • the dies are, schematically speaking, constituted by a cavity into which powders are deposited, and by at least one punch having the task of pressing the deposited powders.
  • the cavity is geometrically designed according to the form and shape of the tile to be produced. It is afforded in the bottom die and at each pressing cycle must be filled with the correct quantity of powder.
  • the batching of the powders is performed by a special device such as a loading hopper, which exists in many forms but always has the characteristic of having to be introduced into the open die, precisely between the bottom die containing the cavity and the top die or punch.
  • the loading hopper has to make an outward and return motion into the open bottom die, which takes a not inconsiderable time within the context of the whole press-forming cycle. This time consumption becomes particularly relevant when, as happens ever more frequently, double-loading hoppers are used to deposit at least two distinct layers of powder separately, one on top of the other, in the cavity.
  • the consequent lengthening of press-forming cycle time has the immediate negative consequence that the whole plant production rate drops.
  • the structure of the dies in the prior art also contain serious drawbacks, among which one of the most important is certainly the high wear inflicted on the various parts of the die due to the relative motion of the punches and the cavities.
  • the phenomenon is so considerable that in traditional dies the punch is heated by special devices so that it expands to take up the play which over a period of time is created between it and the bottom die.
  • a functional defect in the prior art surely due to the structure and the specific functioning modalities of traditional dies, relates to the frequency of defects produced on the workpiece pressed during the extraction phase, that is, the phase in which the pressed piece is extracted from the cavity in which forming has taken place. This tendency to defectiveness is produced around the edges of the piece, where dragging against the cavity walls occurs.
  • the main aim of the present invention is to overcome the limitations and drawbacks of the prior art as evidenced above, by providing a device for forming ceramic products by powder pressing, or in any case for forming materials having prevalently plastic characteristics which are functionally and constructionally simple.
  • the present invention provides a device for forming ceramic products by pressing powders, in particular for tile production, for which there is no need for the presence of the loading trucks usually employed in the prior art, which trucks necessarily limit the pressing cycle to the operations for the formation of the layer of powders to be pressed in the cavity.
  • One advantage of the invention is its economy.
  • a further advantage consists in its durability over a period of time.
  • a still further advantage lies in its ability to add considerably to productivity with respect to prior-art applications.
  • a further advantage of the invention is considerably to reduce defects in the pressed workpieces.
  • 1 denotes in its entirety a frame on which a lower body 2 is supported, which is superiorly provided with a support surface 20.
  • this surface 20, which is flat and lies horizontally, constitutes the rest plane for a support 8 which receives and bears a layer of powders 5 which is destined to be pressed.
  • a further embodiment, not illustrated in the figures, has the support surface 20 specifically predisposed to receive a layer of powders to be pressed directly on it.
  • a punch-bearing upper body 3 is predisposed, which is constrained to the frame 1 and equipped with at least a plurality of contiguous active surfaces 30 facing the support surface 20 of the body 2.
  • the active surfaces 30 of the plurality of active surfaces 30 have a punch function and are perimetrally delimited by a shaping frame 4 which is grate-structured and is able to move freely with respect to the upper body 3 so that it can project inferiorly from the active surfaces 30, which in the illustrated example are co-planar.
  • the shaping frame 4 has lower edges which are knife- or blade-shaped. This enables the edges to penetrate very easily into the powders 5 so as to divide them into an internal portion, totally underlying the active surfaces 30, and external portions not underlying said surfaces 30.
  • the powder layer 5 between the lower body 2 and the upper body 3 is moved into a parallel location to the support surface 20 and the active surfaces 30, essentially by means including the support 8.
  • the pressing action interests only a part of the powder layer 5 and is effected by relative motion of the lower body 2 and the upper body 3, which bodies move in a perpendicular direction to the support surface 20 and the active surfaces 30.
  • the shaping frame 4 is also able to move perpendicularly to the support surface 20 and the active surfaces 30 and simply rests on raising devices constituted by extractor cylinders 40 which are constrained to the frame 1 on two opposite sides of the body 2.
  • Thee extractor cylinders 40 have the task of raising by predetermined amounts and on command the shaping frame 4 and keeping it in the predetermined raised position with respect to the active surfaces 30 and the support surface 20.
  • the shaping frame 4 possesses a freedom of movement with respect to the upper body 3 which enables it to project inferiorly from the active surfaces 30 by an amount which is proportional to the thickness of the powder layer 5.
  • the upper body 3 is fixed to the frame 1, while the lower body 2 is mobile on command along said perpendicular direction to the active surface 30 and to the support surface 20.
  • the movement of the lower body 2 is made possible by an actuator which comprising a hydraulic actuator constituted by a chamber 6 into which pressurised fluid is forced.
  • the chamber 6 is superiorly closed by a diaphragm 7 which is designed to support on an external upper face thereof the whole lower body 2 which functions as a sort of piston pushed upwards by the raising of the diaphragm 7, caused by the introduction of a pressurised fluid, namely oil, into the chamber 6.
  • a pressurised fluid namely oil
  • the functioning of the device can be summed up in an ordered sequence of phases in process comprising:
  • the moving of the support 8 can easily be realised by causing the support 8 itself to slide on the support surface 20.
  • the support 8 could, for example, be constituted by a sort of tray which before being inserted between the lower body 2 and the upper body 3 in the raised position, be loaded with the powder layer 5. Once shaping has taken place the support 8 - now containing the pressed material (tiles) and the non-pressed external portion of the original layer 5 - can be removed with the same simplicity of movement with which it was previously inserted.
  • the operative modalities described enable the preparation and laying of the powder layer 5 to be carried out away from the press-forming device, with the obvious advantage that in this way preparation and predisposition of the powder layer 5 to be pressed in the press-forming operation can be done independently one of the other: thus the time needed for the forming cycle is not minimally influenced by the preparation time for the layer of material to be pressed.
  • layers 5 obtained from successive superpositioning of layers, theoretically in indefinite numbers, of various powders can be achieved, in small layers and/or decorations.
  • the modalities of extracting the tiles from the shaping frames 4, in which the portions of pressed material are loosened from the walls they have been shaped by under pressure, reduce defective production to a minimum.
  • a simplified variant of the illustrated process differs there-from only inasmuch as it does not include the use of supports 8 and envisages the laying of a layer of powders 5 directly on the support surface 20 of the lower body 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
EP98119426A 1998-10-15 1998-10-15 Dispositif pour la fabrication d'éléments en céramique tels que carreaux et produits similaires par pressage de poudre Withdrawn EP0995562A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98119426A EP0995562A1 (fr) 1998-10-15 1998-10-15 Dispositif pour la fabrication d'éléments en céramique tels que carreaux et produits similaires par pressage de poudre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98119426A EP0995562A1 (fr) 1998-10-15 1998-10-15 Dispositif pour la fabrication d'éléments en céramique tels que carreaux et produits similaires par pressage de poudre

Publications (1)

Publication Number Publication Date
EP0995562A1 true EP0995562A1 (fr) 2000-04-26

Family

ID=8232798

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98119426A Withdrawn EP0995562A1 (fr) 1998-10-15 1998-10-15 Dispositif pour la fabrication d'éléments en céramique tels que carreaux et produits similaires par pressage de poudre

Country Status (1)

Country Link
EP (1) EP0995562A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1250990A2 (fr) * 2001-04-20 2002-10-23 Ghi.Tech. S.R.L. Moule avec des cavités modulaires pour le façonnage d'articles céramiques
EP1433580A2 (fr) * 2002-12-26 2004-06-30 Jian Xu Procédé et dispositif de fabrication de produits céramiques
EP1366874A3 (fr) * 2002-05-31 2005-04-27 Cerservice S.r.l. Dispositif pour la fabrication d'une masse cohérente en poudre céramique

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB880892A (en) * 1959-10-05 1961-10-25 Alexander John Cherney An improved method and apparatus for the manufacture of tiles
DE1142265B (de) * 1956-10-11 1963-01-10 Jurid Werke Gmbh Verfahren zum Herstellen von zu sinternden Presslingen aus Metallpulver
US3540093A (en) * 1966-03-21 1970-11-17 Interpace Corp Apparatus for manufacture of pressed ceramic articles
GB1246701A (en) * 1969-01-16 1971-09-15 Carborundum Co Method of moulding powdered or granular material
US4323178A (en) * 1978-12-21 1982-04-06 Centro Di Ricera Enrico Longinotti Firenze S.P.A. Apparatus to provide an even layer or loose material to a suction conveyor
WO1996015888A1 (fr) * 1994-11-22 1996-05-30 Carlo Antonio Camorani Procede de compactage de poudres et appareil associe
WO1998023424A2 (fr) * 1996-11-22 1998-06-04 Carlo Antonio Camorani Fabrication de matieres pulverulentes

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1142265B (de) * 1956-10-11 1963-01-10 Jurid Werke Gmbh Verfahren zum Herstellen von zu sinternden Presslingen aus Metallpulver
GB880892A (en) * 1959-10-05 1961-10-25 Alexander John Cherney An improved method and apparatus for the manufacture of tiles
US3540093A (en) * 1966-03-21 1970-11-17 Interpace Corp Apparatus for manufacture of pressed ceramic articles
GB1246701A (en) * 1969-01-16 1971-09-15 Carborundum Co Method of moulding powdered or granular material
US4323178A (en) * 1978-12-21 1982-04-06 Centro Di Ricera Enrico Longinotti Firenze S.P.A. Apparatus to provide an even layer or loose material to a suction conveyor
WO1996015888A1 (fr) * 1994-11-22 1996-05-30 Carlo Antonio Camorani Procede de compactage de poudres et appareil associe
WO1998023424A2 (fr) * 1996-11-22 1998-06-04 Carlo Antonio Camorani Fabrication de matieres pulverulentes

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1250990A2 (fr) * 2001-04-20 2002-10-23 Ghi.Tech. S.R.L. Moule avec des cavités modulaires pour le façonnage d'articles céramiques
EP1250990A3 (fr) * 2001-04-20 2003-12-03 Ghi.Tech. S.R.L. Moule avec des cavités modulaires pour le façonnage d'articles céramiques
EP1366874A3 (fr) * 2002-05-31 2005-04-27 Cerservice S.r.l. Dispositif pour la fabrication d'une masse cohérente en poudre céramique
EP1433580A2 (fr) * 2002-12-26 2004-06-30 Jian Xu Procédé et dispositif de fabrication de produits céramiques
EP1433580A3 (fr) * 2002-12-26 2005-10-12 Foshanlinghai Ceramic SCI & TECH Co. Ltd. Procédé et dispositif de fabrication de produits céramiques

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