EP1818148B1 - Procédé destiné à la fabrication d'objets creux en céramique par moulage sous pression - Google Patents

Procédé destiné à la fabrication d'objets creux en céramique par moulage sous pression Download PDF

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Publication number
EP1818148B1
EP1818148B1 EP20070002668 EP07002668A EP1818148B1 EP 1818148 B1 EP1818148 B1 EP 1818148B1 EP 20070002668 EP20070002668 EP 20070002668 EP 07002668 A EP07002668 A EP 07002668A EP 1818148 B1 EP1818148 B1 EP 1818148B1
Authority
EP
European Patent Office
Prior art keywords
coreless
slip
mould
ceramic hollow
mould cavity
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 - Fee Related
Application number
EP20070002668
Other languages
German (de)
English (en)
Other versions
EP1818148A2 (fr
EP1818148A3 (fr
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.)
Maschinen und Stahlbau Julius Lippert GmbH and Co KG
Original Assignee
Maschinen- und Stahlbau Julius Lippert & Cokg GmbH
Maschinen und Stahlbau Julius Lippert GmbH and 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
Application filed by Maschinen- und Stahlbau Julius Lippert & Cokg GmbH, Maschinen und Stahlbau Julius Lippert GmbH and Co KG filed Critical Maschinen- und Stahlbau Julius Lippert & Cokg GmbH
Publication of EP1818148A2 publication Critical patent/EP1818148A2/fr
Publication of EP1818148A3 publication Critical patent/EP1818148A3/fr
Application granted granted Critical
Publication of EP1818148B1 publication Critical patent/EP1818148B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/26—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
    • 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
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/26—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
    • B28B1/265—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor pressure being applied on the slip in the filled mould or on the moulded article in the mould, e.g. pneumatically, by compressing slip in a closed mould
    • 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
    • B28B13/0275—Feeding a slurry or a ceramic slip

Definitions

  • the invention relates to a method according to the preamble of claim 1 for the production of hollow ceramic articles by high-pressure casting.
  • cup pressure casting a device is used, in which the upper mold part or the lower mold part forms a core, is used in high-pressure casting ceramic hollow objects without core.
  • the mold cavity Schlicker is filled and pressurized, so that forms in the mold cavity of the cullets of the ceramic hollow article depending on the pressure duration with the desired thickness shear.
  • the residual slip is emptied out of the mold cavity.
  • a gaseous medium preferably air
  • the residual slip is forced out of the mold cavity by opening an emptying valve connected to the device.
  • the solidification of the cullet on the inside of the mold cavity is also done with compressed air.
  • a device of the type mentioned is from the WO 92/15 436 A1 known.
  • this known device determines a coreless mold cavity corresponding to the ceramic hollow article to be produced, in which a rotor element is provided for generating a rotary movement of the slip therein, which has at least one stirring blade and can be driven by means of a drive motor.
  • the rotor element consists for example of a shaft with a diameter of 22 mm and stirring blades, which are made of a rod of similar diameter.
  • the rotor blades can also be flat or perforated leaves.
  • the respective mold is moved into a filling station and into a stirring station.
  • the filling of the mold and the stirring of the slurry can also take place in the same station.
  • the slurry-filled mold is fed after the stirring process to known process steps such as storage, emptying, dripping and conditioning.
  • a device of the type mentioned is from the GB-A-929752 known.
  • the invention has for its object to provide a method of the type mentioned above, wherein the device is simple and Schlicker runner according to the method are eliminated in a simple manner.
  • At least one stirring blade having rotor element of the slip in the coreless mold cavity of the molding apparatus is rotated, so that when emptying the slurry from the mold cavity Schlicker runner are wiped on the side by the rotating slurry.
  • the rotor element has at least one stirring blade and is provided in the mold cavity such that its axis of rotation is oriented perpendicular to the bottom of the ceramic hollow article to be produced.
  • the at least one stirring blade is formed with side edges which are adapted to the side wall contour of the coreless mold cavity and spaced therefrom. This distance corresponds e.g. approximately half the radial distance between the axis of rotation of the rotor element and the inner contour of the mold side parts of the molding device.
  • the at least one stirring blade has an end edge which is adapted to the bottom contour of the coreless mold cavity and has a small distance therefrom. This distance between the end edge of the at least one stirring blade and the bottom contour of the coreless mold cavity is preferably adapted to the shear thickness of the green hollow article produced in the mold cavity.
  • the coreless mold cavity is preferably provided for the upside down production of a ceramic hollow article.
  • the ceramic hollow article may be one with a handle. It is preferred if the lower mold part is formed with a handle support. This ensures that ceramic hollow objects can be safely demoulded with a large handle. When opening the molding device said handle support holds the handle in position and when removing the ceramic hollow article, the handle is released from the porous mold base and lifted off, for example by means of compressed air.
  • the coreless mold cavity may be provided for head-mounted manufacture of a ceramic hollow article with a spout, wherein the lower mold part is formed with a spout emptying channel is emptied through the residual slip from the mold cavity.
  • the spout emptying channel has an emptying opening which is adapted in shape to the spout opening of the spout of the ceramic hollow article, because this advantageously substantially reduces the cleaning effort on the spout or on the spout opening.
  • the object underlying the invention is according to the method, ie in a method according to the preamble of claim 1, as it is known from US-A-5,498,383 is known, by the characterizing features of claim 1, ie achieved in that at least during the emptying of the Restschlickers provided in the coreless mold cavity rotor element having at least one stirring blade, and is rotated by means of a drive motor in rotation to the on the side wall of the Hohlumblestandscherbens residual slip to put during emptying in a rotary motion. Due to the rotating residual slip when emptying the Residual Schlickers Schlicker runner wiped on the side wall of the green hollow object and avoided by such Schlicker runner-related production committees.
  • the rotor element is already set in rotation during the pouring of the slurry into the coreless mold cavity. This causes the slip to rotate during the entire casting cycle.
  • the distance of the rotor element to the upper mold part of the molding device is adjusted to the thickness of the bottom of the green ceramic hollow article to be produced to slip on the inside of the bottom of the green ceramic hollow article to be produced and to prevent a corresponding production committee.
  • the rotational speed of the rotor element is changeable or changed during the entire cycle of production of the ceramic hollow article in the coreless mold cavity.
  • the slip is preferably introduced from below into the coreless mold cavity provided for the ceramic hollow article to be produced upside down and pressurized with pressure.
  • the pressure level and / or the pressure duration of the desired shear thickness of the green ceramic hollow article to be produced can be adjusted accordingly.
  • a gaseous medium preferably air
  • the solidification of the cullet on the inner contour of the coreless mold cavity is also carried out with gaseous medium, preferably with air.
  • the molding device is usually designed to be rotatable in order to be able to empty the remainder of the slip even at points behind the ceramic hollow article to be produced
  • only one rotor element is provided in the mold cavity, resulting in a substantial simplification.
  • the device 10 for the production of hollow ceramic articles such as jugs, vases, cups, cups or the like, provided by high-pressure casting has a mold top 12, a bottom mold part 14 and mold side part 16 and 18 (see also FIG. 2 ) on.
  • the upper mold part 12, the lower mold part 14 and the mold side parts 16 and 18 define a mold cavity 20, the inner contour 22 of which corresponds to the outer contour of the green ceramic hollow article to be produced.
  • FIG. 1 is a mold cavity 20 drawn for a pot, which has a handle 24 and a spout 26.
  • the mold cavity 20 is fluidly connected to a slurry inlet 28 and to a slurry outlet 30.
  • the slurry inlet 28 has an inlet valve 32 and the slurry outlet 30 has an emptying valve 34.
  • a rotor element 36 is provided, which is connected to a drive motor 38.
  • the connection of the drive motor 38 with the rotor element 36 formed by a stirring blade 40 is realized by a hollow shaft 42, to which a gaseous medium, preferably compressed air, can be connected. Is in FIG. 1 indicated by the dash-dotted arrow line 44.
  • a sealing element 46th is provided to seal the hollow shaft 42 against the slip inlet 28 and the Schlickerauslass 30.
  • the rotor element 36 is provided in the mold cavity 20 in such a way that its axis of rotation 48 is oriented perpendicular to the bottom 50 of the green ceramic hollow article to be produced in the mold cavity 20 of the device 10.
  • the stirring blade 40 of the rotor element 36 is formed with a front edge 52 which is adapted to the bottom contour 54 of the coreless mold cavity 20 and has a small distance 56 from this. This small distance 56 corresponds to the shear thickness of the bottom of the green ceramic hollow article to be produced or produced in the mold cavity 20.
  • FIG. 1 As can be clearly seen, the coreless mold cavity 20 is provided for the upside down production of the ceramic hollow article.
  • the lower mold part 14 of the molding apparatus 10 is formed with a handle support 58 in order to be able to safely remove the handle 24 as well.
  • the lower mold part 14 is formed with a spout emptying channel 60 which has an emptying opening 62, which is adapted in shape to the spout opening 64 of the spout 26 of the ceramic hollow article.
  • the handle 24 - as has already been explained - is supported on the lower mold part 14 or on the handle support 58.
  • the self-contained sealing cord 68 is provided on the lower mold part 14 and the split counter-ring 70 is connected to the two mold side parts 16 and 18 are arranged.
  • the at least one stirring blade 40 of the rotor element 36 has side edges 72 which are approximately adapted to the side wall contour 74 of the coreless mold cavity 20 and have a large distance 76 from the side wall contour 74. This distance 76 corresponds for example to approximately half the distance between the side wall contour 74 and the axis of rotation 48 of the rotor element 36 or of the at least one stirring blade 40 of the rotor element 36.

Landscapes

  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Moulds, Cores, Or Mandrels (AREA)

Claims (8)

  1. Procédé destiné à la fabrication d'objets creux en céramique par moulage sous haute pression, sachant que dans un dispositif (10) présentant une partie supérieure de moule (12), une partie inférieure de moule (14) et des parties latérales de moule (16, 18) qui forment, à l'état fermé du dispositif (10), un espace creux de moule (20) sans noyau correspondant à l'objet creux en céramique à fabriquer, une barbotine céramique est remplie sous pression par une entrée de barbotine (28) qui forme, sur le contour intérieur (74, 54) de l'espace creux de moule sans noyau (20), une pâte d'une épaisseur souhaitée, après quoi la barbotine restante est évacuée par une sortie de barbotine (30) de l'espace creux de moule (20) sans noyau,
    caractérisé en ce
    qu'au moins pendant l'évacuation de la barbotine restante, un élément de rotor (36) prévu dans l'espace creux de moule (20) sans noyau qui présente au moins une lame agitatrice (40), est amené en rotation à l'aide d'un moteur d'entraînement (38) afin de faire tourner la barbotine restante se trouvant sur la paroi latérale de la pâte d'objet creux pendant l'évacuation.
  2. Procédé selon la revendication 1,
    caractérisé en ce
    que l'élément de rotor (36) est déjà amené en rotation pendant le versement de la barbotine dans l'espace creux de moule (20) sans noyau.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce
    que la distance (56) entre l'élément de rotor (36) et la partie supérieure de moule (12) du dispositif de moule (10) est réglée sur l'épaisseur de pâte du fond (50) de l'objet creux en céramique à fabriquer.
  4. Procédé selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce
    que la vitesse de rotation de l'élément de rotor (36) est ou peut être modifiée pendant le cycle entier de fabrication de l'objet creux en céramique dans l'espace creux de moule (20) sans noyau.
  5. Procédé selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce
    que la barbotine est introduite par le bas par la partie inférieure de moule (14) dans l'espace creux de moule (20) sans noyau prévu pour un objet creux en céramique à fabriquer de manière inversée et est mise sous pression.
  6. Procédé selon la revendication 5,
    caractérisé en ce
    que le niveau et/ou la durée de pression est réglée selon l'épaisseur de pâte souhaitée de l'objet creux en céramique à fabriquer.
  7. Procédé selon l'une quelconque des revendications 1 à 6,
    caractérisé en ce
    qu'un agent gazeux, de préférence de l'air, est injecté après la formation de la pâte pour l'évacuation de la barbotine restante de l'espace creux de moule (20) sans noyau dans celui-ci.
  8. Procédé selon l'une quelconque des revendications 1 à 7,
    caractérisé en ce
    que le durcissement de la pâte sur le contour intérieur (74, 54) de l'espace creux de moule (20) sans noyau est aussi effectué avec l'agent gazeux, de préférence de l'air.
EP20070002668 2006-02-09 2007-02-07 Procédé destiné à la fabrication d'objets creux en céramique par moulage sous pression Expired - Fee Related EP1818148B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610005897 DE102006005897B4 (de) 2006-02-09 2006-02-09 Vorrichtung und Verfahren zur Herstellung keramischer Hohlgegenstände durch Hochdruckgießen

Publications (3)

Publication Number Publication Date
EP1818148A2 EP1818148A2 (fr) 2007-08-15
EP1818148A3 EP1818148A3 (fr) 2007-10-31
EP1818148B1 true EP1818148B1 (fr) 2011-09-14

Family

ID=38050094

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070002668 Expired - Fee Related EP1818148B1 (fr) 2006-02-09 2007-02-07 Procédé destiné à la fabrication d'objets creux en céramique par moulage sous pression

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Country Link
EP (1) EP1818148B1 (fr)
DE (1) DE102006005897B4 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE575076C (de) * 1932-04-13 1933-04-24 Porzellanfabrik Kahla Eingusstrichter zum Eingiessen der keramischen Masse in die Form
GB929752A (en) * 1959-11-24 1963-06-26 Porzellanwerk Reichenbach Veb Process of and apparatus for production of articles of ceramic substances or synthetic plastics
DE1951931A1 (de) * 1969-10-15 1971-04-22 Netzsch Maschinenfabrik Verfahren und Vorrichtung zur Herstellung von Hohlgefaessen durch Giessen keramischen Schlickers und Anwendung von Elektrophorese
JPH01141003A (ja) * 1987-11-27 1989-06-02 Toyota Motor Corp セラミック中空体の製造方法
GB9104467D0 (en) * 1991-03-02 1991-04-17 Central Ceramic Services Limit Slip casing
US5498383A (en) * 1994-05-18 1996-03-12 National Research Council Of Canada Slip casting process and apparatus for producing graded materials

Also Published As

Publication number Publication date
DE102006005897B4 (de) 2009-06-25
DE102006005897A1 (de) 2007-08-16
EP1818148A2 (fr) 2007-08-15
EP1818148A3 (fr) 2007-10-31

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