EP1132185A2 - Formteil für das Pressen von keramischen Fliesen - Google Patents

Formteil für das Pressen von keramischen Fliesen Download PDF

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Publication number
EP1132185A2
EP1132185A2 EP01104570A EP01104570A EP1132185A2 EP 1132185 A2 EP1132185 A2 EP 1132185A2 EP 01104570 A EP01104570 A EP 01104570A EP 01104570 A EP01104570 A EP 01104570A EP 1132185 A2 EP1132185 A2 EP 1132185A2
Authority
EP
European Patent Office
Prior art keywords
mold part
plate
support
cavity
part 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.)
Withdrawn
Application number
EP01104570A
Other languages
English (en)
French (fr)
Other versions
EP1132185A3 (de
Inventor
Franco Bagni
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1132185A2 publication Critical patent/EP1132185A2/de
Publication of EP1132185A3 publication Critical patent/EP1132185A3/de
Withdrawn legal-status Critical Current

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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
    • B30B15/06—Platens or press rams
    • B30B15/061—Cushion plates
    • 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 present invention relates to an improved mold part for pressing ceramic articles such as tiles.
  • Molds used in the pressing of ceramic articles, such as tiles, being constituted by two complementary mold parts, one of which is rigid and the other one is of the so-called isostatic type, are known.
  • the latter mold part acts on the bottom surface of the tile, the so-called “scoring” or “facing”, shaped so as to form a supporting grid, takes advantage of the property of an incompressible fluid to transmit pressure uniformly in all directions, and is used in order to compensate for the different values assumed locally by the density of the ceramic material loaded for pressing, arising from inherent lack of homogeneity of the material itself or from anomalies occurring during feeding and loading.
  • conventional isostatic mold parts are constituted by a rigid support, on one surface of which there is provided a cavity which is open outward and is closed, in an upward region, by a membrane made of a material such as rubber or resin, on the upper outward-facing surface of which there is provided the complementary impression of the bottom surface of the tile to be formed.
  • a chamber remains between the cavity and the membrane and is divided by a rigid grid into a plurality of individual cells, the membrane being firmly anchored to the outer edge of the support and to the upper surface of the grid so as to close and separate the cells in an upward region.
  • the cells are connected one another, in a downward region, by a plurality of connecting holes and channels for feeding a pressurized fluid which are formed in the bottom of the cells and in the body of the support.
  • the portions of the membrane that close the individual cells in an upward region are supported by the corresponding cushions of pressurized fluid that form between the cells and said portions, and are thus free to undergo deformations and/or move under the action of the fluid.
  • the aim of the present invention is to eliminate the above-mentioned drawbacks of conventional isostatic mold parts by providing an improved mold part for pressing ceramic items which allows to uniformly compensate and correct the different density values assumed by the ceramic material to be pressed, avoiding the formation of unevenness, tensions and deformations in the body of the molded item and does not require the execution of complicated machining steps and long production times.
  • an object of the present invention is to provide a structure which is simple, relatively easy to provide in practice, safe in use, effective in operation, and of relatively low cost.
  • the present improved mold part for pressing ceramic items characterized in that it comprises: a concave rigid support, which forms a cavity open in an upward region; a plurality of open cells, formed proximate to the bottom of the cavity; a perforated plate, which can be inserted in the cavity so as to rest on the surface formed by said cells; a membrane for closing the cavity in an upward region, which is made of a material of the elastically deformable type and can be fixed perimetrically to the edge of the support; and at least one hole, which is formed in said support and is connected to the cavity, for feeding an incompressible fluid so as to form a continuous cushion which is interposed between the perforated plate and the membrane and is adapted to allow uniform distribution of the pressing loads of the ceramic items.
  • reference numeral 1 generally designates an improved mold part for pressing ceramic items, such as tiles.
  • the mold part 1 is associable with the structure of a press for coupling to a complementary mold part, both of which are not shown because of a conventional type.
  • the mold part 1 is constituted by a rigid and concave support 2, which forms a cavity 3 open in an upward region and on the bottom of which there are provided a plurality of open cells 4 which are mutually distinct and separated by corresponding separation edges 5.
  • the mold part 1 further comprises a perforated plate 6 which can be inserted in the cavity 3 and rests on the surface formed by the cells 4, a membrane 7 which closes the cavity 3 in an upward region, and a hole 8 for feeding an incompressible pressurized fluid for filling the empty spaces inside the cavity 3.
  • the membrane 7 is made of elastically deformable material and is fixed perimetrically to the edge 9 of the support 2 that forms the cavity 3.
  • the plate 6 is provided with a plurality of mutually staggered through holes 11 which constitute corresponding channels 12 for connecting the cells 4 and the cushion 10, the individual cells 4 being thus mutually connected in an upward region.
  • the membrane 7 is constituted by a wall 13, made of a material of the elastomeric type such as rubber, resins or the like, which is fixed perimetrically to the edge 9, and by a sheet 14, which is made of flexible elastic material, such as spring steel or the like.
  • the lower surface of the wall 13, being directed towards the inside of the cavity 3, is rigidly anchored to the upper surface of the sheet 14 so as to form a monolithic body.
  • the membrane 7 can undergo deformations of the elastic type and the sheet 14 stiffens the wall 13 and together with the presence of the continuous cushion 10 of fluid allows uniform distribution of the pressing loads.
  • the mold part 1 further comprises means 15 for adjusting the level of the plate 6 with respect to the membrane 7, which are associated with the support 2 and allow to provide the membrane 7 and determine the thickness of the cushion 10, and means 16 for stabilizing the plate 6 with respect to the support 2, which are adapted to keep said plate fixed in the active configuration, i.e. during pressing to form the ceramic items.
  • edges 5 that separate the cells 4 are constituted by channels 17 for containing tubular elements 18 which are inserted therein so as to protrude partially in order to support the plate 6, while the stabilization means 16 are constituted by screw-type fixing means 19 which are flush-fitted proximate to the central region of the plate 6 and can be inserted in the support 2.
  • the tubular elements 18 are made of a plastically deformable material and are constituted by metallic wires, for example made of steel or the like, which also act as adjustment means 15, allowing, thanks to their deformability, the self-calibration of the thickness of the cushion 10 during pressing loads.
  • the tubular elements 18 can be inserted in the cells 4, so long as they are thicker than said cells; in this case it is no longer necessary to provide the containment channels 17.
  • the adjustment means 15 comprise a plurality of actuation screws 20 which are arranged substantially at right angles to the plane of the plate 6 and can be inserted in corresponding threaded through holes 21 formed in the bottom of the support 2 at the cells 4.
  • the screws 20 have a first end 22 which can be inserted in the cavity 3 for lifting and lowering the plate 6 and a second end 23 which can be actuated from outside.
  • the stabilization means 16 are instead constituted by a pin 24 which is perpendicular and rigidly coupled to the lower surface of the plate 6 proximate to its central region and whose free end can be inserted in a corresponding through hole 25 being formed in the support 2 and protruding from it in order to be associated with a locking element constituted by a nut 26.
  • the mold part 1 further comprises a fluid discharge hole 27, which is also connected to the cavity 3, and elements 28 for closing hermetically the intake hole 8 and the discharge hole 27.
  • the incompressible fluid is, for example, oil and is fed at a pressure on the same order of magnitude as the average value of the molding pressure of the ceramic items.
  • the mold part 1 comprises at least one duct for connecting the cavity 3 to a similar cavity of at least one adjacent mold part, which is associated with the press for the balanced distribution of the fluid among the several mold parts that are present therein.
  • the method for the first embodiment of the mold part 1 ( Figures 2, 3 and 4) consists in inserting the plate 6 in the cavity 3 of the support 2 so as to rest on the protruding portion of the tubular elements 18, in inserting with a flush fit the screw-type means 19 for fixing the plate 6 to the support 2, in resting the sheet 14 on the plate 6, in arranging the wall 13 on the sheet 14 and on the edge 9 of the support 2, in feeding the cavity 3 with the incompressible fluid (oil) so as to occupy the empty spaces provided inside it, and in inserting hermetically the closure elements 28 in the intake hole 8 and in the discharge hole 27, respectively.
  • the tubular elements 18 undergo plastic deformation by compression, moving the plate 6 into a lowered configuration with respect to the sheet 14 so as to form the continuous cushion 10 of fluid which becomes interposed between the membrane 7 and the plate 6.
  • the means 15 for adjusting the level of the plate 6 are formed, in this case, by the tubular elements 18, which allow self-calibration of the thickness of the cushion 10.
  • the method for the second embodiment of the mold part 1 ( Figures 6, 7, 8 and 9) consists in inserting the plate 6 in the cavity 3 of the support 2 so that it rests on the edges 5 that separate the cells 4; in inserting the screw-type actuation means 20 in the cavity 3, in order to lift and support the plate 6 in a raised configuration with respect to the edges 5; in resting the sheet 14 on the plate 6; in arranging the elastic wall 13 on the sheet 14 and on the edge 9 of the support 2 that forms the cavity 3, so as to constitute the membrane 7 monolithically; in disengaging the screw-type actuation means 20 from the cavity 3, with consequent lowering of the plate 6, which is thus returned to rest on the edges 5.
  • the lowering of the plate 6 allows to define the thickness of the cushion 10 interposed between the membrane 7 and said plate 6, which is then fixed by locking the pin 24 with the nut 26.
  • the placement of the wall 13 on the sheet 14 so as to form the membrane 7 provides for applying an adhesive to the upper surface of the sheet 14 and of the edge 9, depositing the rubber or resin at a specific temperature and applying to the wall 13 a pressure which ensures its adhesion and rigid anchoring to the sheet 14 and its perimetric fixing to the edge 9 so as to constitute a monolithic body.
  • the described invention achieves the intended aim and objects and in particular allows uniform distribution of the pressing loads on the entire molded item both thanks to the presence of the continuous cushion of fluid and of the stiffening lamina.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Moulds, Cores, Or Mandrels (AREA)
EP01104570A 2000-03-07 2001-03-05 Formteil für das Pressen von keramischen Fliesen Withdrawn EP1132185A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2000MO000035A IT1315606B1 (it) 2000-03-07 2000-03-07 Semistampo perfezionato per la pressatura di manufatti ceramici.
ITMO000035 2000-03-07

Publications (2)

Publication Number Publication Date
EP1132185A2 true EP1132185A2 (de) 2001-09-12
EP1132185A3 EP1132185A3 (de) 2002-10-23

Family

ID=11450380

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01104570A Withdrawn EP1132185A3 (de) 2000-03-07 2001-03-05 Formteil für das Pressen von keramischen Fliesen

Country Status (2)

Country Link
EP (1) EP1132185A3 (de)
IT (1) IT1315606B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112208190A (zh) * 2020-09-23 2021-01-12 湖南精城特种陶瓷有限公司 一种用于陶瓷橡胶钢三合一衬板的成型模具及方法
CN116494354A (zh) * 2023-06-13 2023-07-28 安徽阜阳富龙建筑材料有限责任公司 一种粉煤灰再利用蒸压砖生产装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2204238A1 (de) * 1972-01-29 1973-08-02 Siempelkamp Gmbh & Co Presse fuer die herstellung von gepressten platten
EP0392818A2 (de) * 1989-04-14 1990-10-17 Ngk Insulators, Ltd. Setzform und Verfahren zum isostatischen Pressen von keramischen Materialien
EP0556163A1 (de) * 1992-02-12 1993-08-18 SICHENIA GRUPPO CERAMICHE S.p.A. Form für Keramikziegel
EP0701889A2 (de) * 1994-09-13 1996-03-20 Maris Algeri Form zum isostatischen Pressen von Keramikfliesen und Verfahren zum Herstelllen der Fliesen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2204238A1 (de) * 1972-01-29 1973-08-02 Siempelkamp Gmbh & Co Presse fuer die herstellung von gepressten platten
EP0392818A2 (de) * 1989-04-14 1990-10-17 Ngk Insulators, Ltd. Setzform und Verfahren zum isostatischen Pressen von keramischen Materialien
EP0556163A1 (de) * 1992-02-12 1993-08-18 SICHENIA GRUPPO CERAMICHE S.p.A. Form für Keramikziegel
EP0701889A2 (de) * 1994-09-13 1996-03-20 Maris Algeri Form zum isostatischen Pressen von Keramikfliesen und Verfahren zum Herstelllen der Fliesen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112208190A (zh) * 2020-09-23 2021-01-12 湖南精城特种陶瓷有限公司 一种用于陶瓷橡胶钢三合一衬板的成型模具及方法
CN112208190B (zh) * 2020-09-23 2023-03-14 湖南精城特种陶瓷有限公司 一种用于陶瓷橡胶钢三合一衬板的成型模具及方法
CN116494354A (zh) * 2023-06-13 2023-07-28 安徽阜阳富龙建筑材料有限责任公司 一种粉煤灰再利用蒸压砖生产装置
CN116494354B (zh) * 2023-06-13 2024-02-02 安徽阜阳富龙建筑材料有限责任公司 一种粉煤灰再利用蒸压砖生产装置

Also Published As

Publication number Publication date
EP1132185A3 (de) 2002-10-23
ITMO20000035A1 (it) 2001-09-07
IT1315606B1 (it) 2003-03-14

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