WO2023217806A1 - Procédé de coulage en barbotine et moule de coulage en barbotine - Google Patents

Procédé de coulage en barbotine et moule de coulage en barbotine Download PDF

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Publication number
WO2023217806A1
WO2023217806A1 PCT/EP2023/062330 EP2023062330W WO2023217806A1 WO 2023217806 A1 WO2023217806 A1 WO 2023217806A1 EP 2023062330 W EP2023062330 W EP 2023062330W WO 2023217806 A1 WO2023217806 A1 WO 2023217806A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact surface
slip
slip casting
solid layer
casting mold
Prior art date
Application number
PCT/EP2023/062330
Other languages
German (de)
English (en)
Inventor
Uwe Heinold
Original Assignee
Dorst Technologies Gmbh & 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
Priority claimed from DE202022102564.9U external-priority patent/DE202022102564U1/de
Application filed by Dorst Technologies Gmbh & Co. Kg filed Critical Dorst Technologies Gmbh & Co. Kg
Publication of WO2023217806A1 publication Critical patent/WO2023217806A1/fr

Links

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
    • B28B1/261—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
    • 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
    • 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
    • B28B7/344—Moulds, cores, or mandrels of special material, e.g. destructible materials from absorbent or liquid- or gas-permeable materials, e.g. plaster moulds in general

Definitions

  • the invention relates to a slip casting process and a slip casting mold.
  • the production of castings usually takes place using at least two mold parts.
  • slip is introduced into these mold parts.
  • Slip is a liquid (mushy to viscous) mass (water-mineral mixture) for the production of ceramic products.
  • the slip is pressurized and pressed into the mold so that water is squeezed out of the slip.
  • the shape is held together using closing forces (e.g. hydraulic or pneumatic or the like).
  • the water escapes from the mold due to the slip pressure and a so-called green compact is created.
  • To remove the green body (the body) the mold parts must be opened so that the green body can be removed from the mold.
  • the mold parts are then usually cleaned (e.g. with water and/or air).
  • the mold parts can then be closed again so that a new casting cycle can begin.
  • the mold parts can be made of a porous material, such as plaster. Furthermore, it is known to design molded parts in such a way that they have a base body on which a filtration layer is applied, through which the water is drained away during drainage.
  • the basic goal of (ceramic) die casting technology is to use filtration of a suspension to create a solid layer that can, if necessary, be further processed to produce an end product for sale.
  • Corresponding products can, for example, be divided into sanitary ware, tableware and technical ceramics.
  • a known process is referred to as core casting and is explained below with reference to FIGS. 1 and 2.
  • a first mold part (first mold part) 11 and a second mold part 12 (second mold part) can be seen (schematically).
  • the mold parts 11, 12 form a mold 10 or a cavity 13 thereof.
  • the first molded part 11 has a first contact surface 14.
  • the second mold part 12 has a second contact surface 15.
  • the mold parts 11, 12 are in contact with a slip located in the cavity 13 via the contact surfaces 14, 15.
  • the mold parts 11, 12 and thus also the contact surfaces 14, 15 are designed to be open-porous, so that (see FIG. 2) there are solid layers, namely a first solid layer 16 and a second solid layer 17, on the corresponding contact surfaces 14, 15 form.
  • a (dotted line) line 18 (which corresponds to a surface in three dimensions) of the collision of the two solid layers 16, 17 represents a point of discontinuity. This is sometimes also referred to as shard separation.
  • the discontinuity regularly leads to a reduction in the mechanical properties of the (common) solid layer, formed from the solid layers 16, 17.
  • Core casting is typically used for tableware ceramics (plates, bowls, etc.).
  • FIGS. 4 and 5 show a mold 10 with an open-porous first mold part 11 and a second, dense (non-open-porous) mold part 12.
  • a one-sided build-up of a (continuous) solid layer 16 takes place (i.e. without shard separation in a build-up typical of core casting). Since the solid layer 16 builds up to the dense molded part 12, it touches it and connects (at least partially) with it.
  • a contact surface of a cast part is made of dense (non-open-porous) material, a release effect by building up pressure cannot be used in a comparable way.
  • a locking device for locking the mold
  • larger parts of the solid layer will stick to the dense molded part, which affects the surface quality of the solid layer. This can lead to considerable effort in the form of necessary rework.
  • the method according to the invention or the device according to the invention may also have one or more of the above general features, taking into account the further features explained below.
  • first cast part namely a mold part
  • second contact surface being at least essentially formed by an open-porous material, such that one contained in the slip Liquid can penetrate into the first molded part
  • a core idea of the invention is to provide at least (or exactly) a second molded part, the contact surface of which is at least substantially close to the liquid, the build-up of the solid layer being aborted or aborted (finished) before the solid layer reaches the contact surface of the second Molded part completely contacted.
  • a build-up of the solid layer can be stopped, for example, by no longer supplying any further slurry (or any further solid particles) and/or by reducing a pressure so that no solid particles (any longer) settle and/or by the (remaining). ) Slip is removed from a (remaining) cavity of the mold.
  • the buildup of the solid layer on the first contact surface can be completed before the solid layer covers the second contact surface by more than 80 percent by area, preferably before the solid layer covers the second contact surface by more than 30 percent by area, more preferably before the solid layer covers the second contact surface by more than 80 percent than 10 percent area covered.
  • the build-up of the solid layer on the first contact surface is completed before the solid layer reaches the second contact surface (i.e. any point on the second contact surface).
  • a substantially dense contact surface is understood to mean, in particular, a surface that is so close to the liquid in the slip that this liquid does not penetrate the surface. Alternatively or additionally, this can be understood to mean a surface on which no solid layer is deposited when a solid layer is deposited on the first contact surface.
  • the second contact surface deviates from the contour of the solid layer (in particular in its final state).
  • the second contact surface is larger than a free surface of the resulting (final) solid layer (whereby a free surface is understood to mean a surface that has no contact with a wall).
  • the second contact surface can, for example, be angular in cross section, for example square and/or (at least in sections, possibly completely) round.
  • the second contact surface is preferably designed as a recess.
  • a cavity formed by the slip casting mold is preferably filled with the solid layer to a maximum of only 95% by volume or less, more preferably a maximum of 80% by volume or less, possibly a maximum of 50% by volume or less.
  • the first contact surface can be greater than or equal to half of a maximum cross-sectional area of a cavity formed by the slip casting mold, preferably greater than or equal to the maximum cross-sectional area of the cavity formed by the slip casting mold, more preferably greater than or equal to 1.2 times or greater than or equal to that 2 times the maximum cross-sectional area of the cavity formed by the slip casting mold.
  • the second contact surface can be greater than or equal to half of a maximum cross-sectional area of a cavity formed by the slip casting mold, preferably greater than or equal to the maximum cross-sectional area of the cavity formed by the slip casting mold, more preferably greater than or equal to 1.2 times, or be greater than or equal to 2 times the maximum cross-sectional area of the cavity formed by the slip casting mold.
  • the (or in the case of several: at least one, possibly several or all) second contact surface(s) is (are) preferably larger than the (or in the case of several: at least one, possibly several or all) first contact surface(s).
  • the slip casting mold can comprise at least two first casting mold parts with a respective first contact surface and/or at least two second casting mold parts with a respective second contact surface.
  • a first total contact area (defined further below in connection with the slip casting mold) is further preferably larger than a second total contact area.
  • the above-mentioned object is further preferably achieved by a slip casting mold for producing a cast part, in particular a ceramic die-cast part
  • first cast part namely a mold part
  • second contact surface being at least essentially formed by an open-porous material, such that a liquid contained in the slip flows into the first Casting can penetrate
  • first or second total contact surface is the contact surface of the corresponding mold part if only a corresponding first or second greeting mold part is present, otherwise it is the sum of the contact surfaces of all first or second greeting mold parts.
  • the first and/or the second contact surface is greater than or equal to half of a maximum cross-sectional area of a cavity formed by the slip casting mold, preferably greater than or equal to the maximum cross-sectional area of the cavity formed by the slip casting mold, further preferably greater than or equal to 1.2 times the maximum
  • a (maximum) depth of the second contact surface can be larger, for example at least 1.5 times larger or at least 2 times larger than a (maximum) depth of the first contact surface. This means that a comparatively large amount of free space can remain, so that the resulting solid layer is prevented from sticking to the second contact surface (at least partially, if necessary completely).
  • the above-mentioned object is further achieved by a slip casting system comprising the above slip casting mold and/or designed to carry out the above method.
  • a slip casting system for producing a casting, in particular a ceramic die-casting part, preferably configured to carry out the above method, comprising a slip casting mold, preferably as described above, and at least one control device, wherein the slip casting mold comprises: at least a first casting mold part, namely a mold part, with a first contact surface which comes into contact with the slip during production, the second contact surface being at least essentially formed by an open-porous material, such that a liquid contained in the slip penetrates into the first casting mold part can, and at least one second mold part with a second contact surface that comes into contact with the slip during production, the second contact surface being formed at least substantially close to the liquid, the control device being configured to cause the following steps: closing the slip casting mold and introducing slip into the slip casting mold, and producing a solid layer formed by the slip, wherein a build-up of the solid layer on the first contact surface is stopped before the solid layer completely contacts the second contact surface.
  • the system in particular its control device, is preferably configured to carry out or initiate the respective method steps.
  • the control device may comprise at least one processor, preferably microprocessor, and/or at least one electronic storage unit.
  • the above-mentioned object is further achieved in particular by using a cast part with a substantially dense contact surface for a one-sided hollow casting or sprue (i.e. in particular for a casting process in which no solid layer grows on the second contact surface or, at best, only a solid layer there in sections adheres).
  • Fig. 1 is a schematic representation of a core casting process
  • Fig. 2 is a schematic representation of a detail from Fig. 1;
  • Fig. 3 is a schematic representation of a hollow casting process
  • Fig. 5 is a schematic representation of a detail from Fig. 4.
  • Fig. 6 is a schematic representation of a method according to the invention or a slip casting mold according to the invention.
  • FIG. 6 shows a slip casting mold 10 according to the invention, comprising a first casting mold part 11 and a second casting mold part 12.
  • the first casting mold part 11 has a first contact surface 14 which is open-porous, so that when a slip is introduced under pressure, a solid layer 16 trains.
  • a second mold part 12 provided, which has an at least essentially dense (non-open-porous) second contact surface 15, so that no solid layer is formed on the second contact surface 15.
  • the (comparatively voluminous) second mold part 12 allows in particular that the solid layer 16 can grow on the one hand, but on the other hand does not (or only slightly) come into contact with the contact surface 15 of the second mold part 12.
  • a large part (at least a predominant part) of the contact surface 12 remains free of the solid layer, as can be seen in FIG. Before further growth can occur, the process is then stopped (or adjusted so that no further growth occurs) and the solid layer is removed. For this purpose, for example, as described in connection with the prior art, a corresponding pressure on the liquid in the first mold part 11 can be set.
  • the contact of the solid layer 16 that builds up with the die-cast part 12 is (at least largely) prevented and a one-sided hollow casting takes place. There are no adhesive effects and there is no need for a sprue over the first (porous) die-cast part 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Dispersion Chemistry (AREA)
  • Automation & Control Theory (AREA)
  • Producing Shaped Articles From Materials (AREA)

Abstract

L'invention concerne un procédé de coulage en barbotine pour la fabrication d'une pièce coulée, en particulier d'une pièce en céramique coulée sous pression, comprenant les étapes consistant à : - fournir un moule de coulage en barbotine qui possède : - au moins une première partie de moule de coulage (11), spécifiquement une partie de moulage, ayant une première surface de contact (14), qui vient en contact avec la barbotine pendant la production, la seconde surface de contact (15) étant formée au moins sensiblement par un matériau à pores ouverts de telle sorte qu'un liquide contenu dans la barbotine puisse passer dans la première partie de moule de coulée (11), et - au moins une seconde partie de moule de coulage (12) ayant une seconde surface de contact (15) qui vient en contact avec la barbotine pendant la production, la seconde surface de contact (15) étant formée de façon à être au moins sensiblement étanche par rapport au liquide, - fermer le moule de coulage en barbotine (10) et introduire de la barbotine dans le moule de coulage en barbotine, et - produire une couche solide (16) formée par la barbotine, l'accumulation de la couche solide (16) sur la première surface de contact (14) prenant fin avant que la couche solide (16) ne soit complètement en contact avec la seconde surface de contact (15). Fig. 3
PCT/EP2023/062330 2022-05-11 2023-05-10 Procédé de coulage en barbotine et moule de coulage en barbotine WO2023217806A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE202022102564.9U DE202022102564U1 (de) 2022-05-11 2022-05-11 Schlickerguss-Form
DE202022102564.9 2022-05-11
DE102022131990.3A DE102022131990A1 (de) 2022-05-11 2022-12-02 Schlickerguss-Verfahren sowie Schlickerguss-Form
DE102022131990.3 2022-12-02

Publications (1)

Publication Number Publication Date
WO2023217806A1 true WO2023217806A1 (fr) 2023-11-16

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PCT/EP2023/062330 WO2023217806A1 (fr) 2022-05-11 2023-05-10 Procédé de coulage en barbotine et moule de coulage en barbotine

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Country Link
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3431332A (en) * 1962-07-16 1969-03-04 Interface Corp Ceramic casting techniques
DE3502348A1 (de) * 1985-01-24 1986-07-24 Gebrüder Netzsch, Maschinenfabrik GmbH & Co, 8672 Selb Verfahren und einrichtung zum druckgiessen fluessigkeitshaltiger masse
DE4027485C1 (en) * 1990-08-30 1992-03-05 Werner Dr. 6740 Landau De Stahl Ceramic mouldings for high strength components mfr. - obtd. in porous mould of plastic, inside which is body which can be rotated about its axis

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3431332A (en) * 1962-07-16 1969-03-04 Interface Corp Ceramic casting techniques
DE3502348A1 (de) * 1985-01-24 1986-07-24 Gebrüder Netzsch, Maschinenfabrik GmbH & Co, 8672 Selb Verfahren und einrichtung zum druckgiessen fluessigkeitshaltiger masse
DE4027485C1 (en) * 1990-08-30 1992-03-05 Werner Dr. 6740 Landau De Stahl Ceramic mouldings for high strength components mfr. - obtd. in porous mould of plastic, inside which is body which can be rotated about its axis

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