EP1817146A2 - Moule de coulee, notamment moule de coulee sous pression, procede pour produire un tel moule de coulee et procede de coulee basse pression - Google Patents

Moule de coulee, notamment moule de coulee sous pression, procede pour produire un tel moule de coulee et procede de coulee basse pression

Info

Publication number
EP1817146A2
EP1817146A2 EP05822037A EP05822037A EP1817146A2 EP 1817146 A2 EP1817146 A2 EP 1817146A2 EP 05822037 A EP05822037 A EP 05822037A EP 05822037 A EP05822037 A EP 05822037A EP 1817146 A2 EP1817146 A2 EP 1817146A2
Authority
EP
European Patent Office
Prior art keywords
base layer
mold
casting
filter layer
layer
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.)
Granted
Application number
EP05822037A
Other languages
German (de)
English (en)
Other versions
EP1817146B1 (fr
Inventor
Roland Menzel
Rudolf Kraus
Heinold Uwe
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.)
DORST Technologies GmbH and Co KG
Original Assignee
DORST Technologies 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
Priority claimed from DE200410056975 external-priority patent/DE102004056975B3/de
Priority claimed from DE200510038887 external-priority patent/DE102005038887A1/de
Application filed by DORST Technologies GmbH and Co KG filed Critical DORST Technologies GmbH and Co KG
Publication of EP1817146A2 publication Critical patent/EP1817146A2/fr
Application granted granted Critical
Publication of EP1817146B1 publication Critical patent/EP1817146B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
    • B28B7/346—Manufacture of moulds
    • 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
    • B28B1/262—Mould materials; Manufacture of moulds or parts thereof
    • 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

  • Mold in particular die-casting mold, method for producing such a mold and method for "low-pressure casting
  • the invention relates to a mold, in particular die-casting mold, with the preamble features of claim 1, to a method for producing such a mold or to a method for low-pressure casting.
  • a mold as a die is used to fabricate e.g. hard metal or ceramic articles by means of the so-called slip casting method.
  • the pressure die consists on the inside of a permeable or porous filter layer through which the liquid of the slurry passes. On the upper side of the filter layer, this results in the formation from the solid constituents of the slip of a broken piece, which forms the ceramic object after removal and sintering.
  • the casting layer adjacent to a base layer which provides the casting layer stability and having a conduit means for discharging the liquid.
  • casting molds for low-pressure casting processes in which molds made of gypsum are used as casting molds. Slip is introduced into the mold virtually without pressure or with slight overpressure. Therefore, such casting methods are referred to as low-pressure casting method.
  • the drainage of such a mold is essentially by capillary action in that the material of the mold absorbs the liquid of the slurry.
  • a disadvantage of the low-pressure casting process the high cycle times of about 3 to 4 hours for simple ceramic articles, since after pouring the slurry and the formation of a cullet on the wall of the mold before demolding of the cullet drying or post consolidation with a duration of about 30 minutes for a simple ceramic article.
  • casting molds with a second conduit device are also known, which are incorporated in the form of hoses for dewatering into the material of the casting mold.
  • the conduit means usually serves on the one hand as a drainage system for draining or discharging the liquid of the slurry.
  • Such molds for die casting usually consist of diecasting molds made of plastic, which has elastic and plastic properties, so that the molds are to be renewed regularly.
  • the problem is a material-inherent life, which already leads to a limited controllable 3D fading in the production of the mold.
  • the mold is replaced when the articles produced are no longer within the given tolerances, so that also by a limited useful life of the die is given.
  • the die-casting mold thus formed is sealed on the outside by means of a resin adhesive.
  • the conduit means for dewatering the porous inner layer or for supplying Compressed air through the porous inner layer thus consists of the coarsely porous outer layer and the tube.
  • EP 0 121 929 B1 or US Pat. No. 4,531,705 describe a very elaborate method for producing a die casting mold, in which, after the molding of a raw base body by means of melting, gaps and pores are formed.
  • DE 42 25 412 C1 describes a mold for producing liquid-containing pressed parts, such as roof tiles made of clay or similar material. The mold has two layers, with the layer coming into contact with the material to be compacted consisting of fine-pored foamed ceramic material, while the layer arranged underneath consists of coarse-pored foamed ceramic material or foamed concrete.
  • the object of the invention is to propose a casting mold, in particular a pressure casting mold, with a simpler construction, a method for producing such a casting mold or an improved method for low-pressure casting.
  • the mold is to provide an improved method of dewatering.
  • the cycle time in the manufacture of ceramic articles is to be shortened by a reduced re-drying time and / or by a reduction in the number of required Shape recovery dryings. A possibility for supplying compressed air would be advantageous.
  • a mold in particular die-casting mold with a base layer, with a permeable filter layer with a filter layer permeability on a surface of the base layer between the base layer and a casting space, with a first conduit means for feeding slurry into the casting space and with a second conduit means is preferred Discharging liquid from the casting space through the filter layer and / or for supplying a pressure medium for detaching a casting space formed in the casting space
  • the mold is advantageous in that the base layer of solid material connected to one another is formed with a base-layer permeability and the filter layer penetrates from the surface of the base layer a distance into the base layer and is connected to the base layer in this area.
  • a casting mold in particular such a casting mold, having a base layer, with a permeable filter layer with a filter layer permeability between the base layer and a casting space, with a first conduit device for feeding slurry into the casting space and with a second conduit device, is preferred for discharging liquid from the casting space through the filter layer and / or for supplying a pressure medium for detaching a broken piece formed in the casting space, wherein the base layer and / or the filter layer is divided by a partition in at least two sections, wherein the sections are separated by printing technology and / or line technology.
  • Die casting method is the application of a negative pressure to the second conduit means far away, since due to the high pressure with which the slurry is pressed into the die, suction through the second conduit means to the outside does not seem necessary, although the application of a negative pressure is also advantageous in die-casting can be.
  • the filter layer permeability preferably corresponds to a permeability or a porosity, as is known from filter layers per se.
  • the base layer permeability or a corresponding base layer porosity is preferably chosen in relation to the filter layer permeability so that there is a slight or negligible pressure resistance in the base layer for the liquid or the slip relative to the ratios in the filter layer consuming
  • a casting mold is preferred in which the bulk material consists of parts of a mineral material, in particular stone or glass, and / or parts of a plastic material.
  • plastics or other materials which have no capillary action or are even water-repellent since the capillary action can be completely or partially dispensed with by the application of the negative pressure is. It is also possible in an advantageous manner to apply a paint of limited permeability or liquid permeability to form the permeable filter layer instead of a granular permeable filter layer.
  • a casting mold is preferred in which the bulk material for its connection is formed from parts of the bulk material which are glued together.
  • a casting mold is preferred in which the bulk material is bonded to a binder wetting the surface of the parts of the bulk material.
  • a casting mold is preferred in which the base layer permeability of the base layer is greater, in particular more than a power of ten is greater than the filter layer permeability of the filter layer.
  • a casting mold is preferred in which the base layer permeability of the base layer is large enough to transport the liquid and / or the printing medium within the base layer with little, in particular negligible, pressure resistance.
  • the pressure resistance within the base layer is seen in the case of die casting in particular relative to the pressure resistance within the filter layer.
  • a casting mold is preferred in which the filter layer is poured onto the base layer, brushed on or sprayed on.
  • a casting mold is preferred in which the filter layer is formed from a material which adheres to the material of the base layer and / or with a coating over the material of the base layer.
  • the coating can be formed for example by an independent coating medium and / or by an adhesive or the binder for bonding the parts of the base layer, whereby advantageously a material and / or positive connection of the bulk material is formed.
  • a casting mold is preferred in which the second conduit device has one or more openings in the base layer.
  • the conduit device accordingly only leads up to the base layer through a wall which surrounds the base layer. The opening thus corresponds to an opening in a surrounding wall or seal of the base layer.
  • a simple conduit system may also pass through the base layer and have one or more separate openings to compensate for any residual pressure resistance within the base layer.
  • a casting mold is preferred with such a dividing wall, in which the dividing wall is formed from a liquid-tight material.
  • a casting mold is preferred in which the dividing wall is formed from a gas-tight material.
  • a casting mold is preferred in which the dividing wall is formed of an elastic material, in particular of plastic and / or silicone.
  • a casting mold is preferred in which the dividing wall subdivides the base layer into the at least two sections, the base layer being formed from a permeable material having a base-layer permeability.
  • such a casting mold is preferred for a low-pressure casting process, wherein the second
  • Conduction device has a connection for applying a ünterdrucks.
  • a low-pressure casting mold from such a casting mold is preferred, the casting mold being dimensioned for applying a differential pressure of less than 2.5 bar, in particular less than 2 bar, to the permeable filter layer by applying a negative pressure to the connection of the second conduit means.
  • the procedure can be implemented from the basic principle but also with larger differential pressures.
  • a low-pressure casting plant with such a mold according to a preceding claim and a pump for applying the negative pressure to the connection of the mold.
  • such a method is preferred in which individual parts of the bulk material are glued together to form the base layer.
  • such a method is preferred in which the filter layer is applied to the surface of the base layer for application to the surface of the Base layer is poured on, brushed or sprayed on.
  • the type of application of the filter layer or of the material of the filter layer depends in particular on the consistency of the fluid of the material.
  • the consistency of the liquid is also selected in view of the fact that the material of the filter layer penetrates sufficiently deep for encompassing parts of the base layer in order to enable a good interlocking of the two layers, but on the other hand does not penetrate too deeply into the base layer in order to prevent a good pressure distribution within the base layer not by too far penetrated material of the filter layer.
  • a method is preferred in which the filter layer, when applied to the surface of the base layer, is liquid enough to penetrate a limited distance into the base layer.
  • a method for producing a casting mold in which a base layer and a permeable filter layer are provided and bonded together, is formed in the base layer and / or in the filter layer, a partition wall such that the partition wall, the base layer and / or the Filter layer divided into at least two printing technology and / or line technology separate sections.
  • the base layer and / or the filter layer is provided with a connection for applying a negative pressure.
  • a method is preferred for producing a cast article using such a casting mold, in which the casting mold is filled with slip and in which a negative pressure is applied to a filter layer and / or a base layer of the casting mold.
  • FIG. 1 is a sectional view of a preferred mold, in particular die-casting mold for a low pressure
  • FIG. 2 shows an enlarged detail of the casting mold from FIG. 1; FIG. and
  • Fig. 3 is a sectional view through a mold with separate printing sections.
  • FIGS. 1 and 2 there is a mold as a die casting or as a casting mold for a low-pressure casting method for manufacturing ceramic articles substantially from a casting layer or filter layer 1, a base layer 2 for supporting and supporting the filter layer 1 and a conduit device 50 The arrangement is surrounded by a wall 40, 41 apart from the side with the filter layer.
  • a mold as a die casting or as a casting mold for a low-pressure casting method for manufacturing ceramic articles substantially from a casting layer or filter layer 1, a base layer 2 for supporting and supporting the filter layer 1 and a conduit device 50
  • the arrangement is surrounded by a wall 40, 41 apart from the side with the filter layer.
  • two or more such die casting molds are arranged with mutually facing filter layers 1 relative to one another to form a casting space 6 between the filter layers 1 ,
  • the conduit means 50-55 consists of a first conduit means 50-52 and a second one
  • the first conduit 50 - 52 consists of a tube 50, which leads through the wall 41 and the filter layers 1-3 to the casting chamber 6 to introduce from the outside Schlicker S in the casting chamber 6.
  • a closure or valve device 52 is connected to the tube 50, above which a slip container 51 for providing the slip S is provided is arranged.
  • a hose which leads to such a Schlicker mynis 51, depending on the needs of the outwardly opening pipe 50 are connected.
  • the second conduit device 53-55 consists of a tube 53, which leads through the wall 40 to the base layer 2, as far as the filter layer 1 or possibly also into this. In principle, it is also possible to guide the pipe 53 and / or further pipes or pipes branching off thereof into the permeable filter layer 1. Under tube is to be understood in principle not only a conventional rigid pipe made of plastic or metal but an arbitrarily designed line system. On the outside, on the pipe 53, in particular in the case of a low-pressure casting process
  • Pump 54 is connected, which serves to apply a negative pressure pl, to suck liquid W. Via an outlet 55, the liquid W is optionally discharged from the pump 54.
  • the pump 54 can be used for injecting compressed air L in the reverse direction.
  • the slurry S introduced into the casting space 6 consists of solid constituents for forming a body and of liquid constituents in the form of the liquid W.
  • This liquid is in particular in the case of a low-pressure casting process by applying a negative pressure of the pump 54 from the casting space 6 through the permeable filter layer 1 and the base layer 2 pulled out.
  • the amount of liquid W is reduced, which remains after such a casting process in the mold.
  • the overpressure p2 in the casting chamber 6 results in particular when the valve 52 is open by a height h of the slurry S standing above the casting space 6 in the first conduit means and possibly the slurry container 51.
  • Optimum negative pressures p1 in the case of a low-pressure casting process can be dependent on Material of the shape, consistency of the slurry S and the geometry of the produced shards or ceramic article individually.
  • the slip S When manufacturing a ceramic article, the slip S is admitted into the casting space 6 above or adjacent to the filter layer 1 in the case of a low-pressure casting process under low pressure. In the case of a die casting process, the slip S is injected under high pressure. The solid constituents of the slip settle on a surface 7 of the filter layer 1, wherein the surface 7 of the
  • Base layer 2 from penetrates the compressed or compressed air L through the filter layer 1 and pushes the broken pieces of the surface 7 away.
  • the base layer 2 is formed from a bulk material in a first working step.
  • the bulk material is a solid, preferably mineral material, such as chippings, stones, etc. Also usable as bulk material are materials such as glass beads or glass pieces, expanded clay, plastic granules and the like.
  • Individual parts T of the bulk material are connected to each other.
  • For bonding preferably serves as a binder B, an adhesive.
  • the parts T of the bulk material can be immersed in a bath of the binder B and then brought into a desired shape in the desired shape.
  • the filter layer 1 is formed on the surface of the base layer 2.
  • the liquid material of the filter layer 1 is poured onto the surface of the base layer and / or brushed and brought into the desired shape.
  • the consistency of the material for forming the filter layer 1 when applied to the surface of the base layer 2 is such that a portion of the material for forming the filter layer 1 penetrates a distance into the surface of the base layer 2 and coincides with the top layer of FIG Parts T of the base layer 2 firmly connects.
  • the consistency of the material for forming the filter layer 1 is selected such that the distance over which the material penetrates into the base layer 2, preferably only as far as is necessary to build a sufficiently strong connection of base layer 2 and filter layer 1 to each other ,
  • the material for the filter layer 1 can be used for conventional materials.
  • PMMA polymethylmethacrylate
  • a fine porous filter layer 1 having a low permeability for passing the liquid W and the compressed air L but for retaining the solid components of the slurry can be formed.
  • the thickness of the filter layer 1 is currently more common in die-casting molds Ceramic article preferably but not necessarily 1 to 40 mm.
  • the base layer 2 As bulk material for the base layer 2, which preferably forms a bed for the filter layer 1, materials are used which offer good strength with regard to the pressures during the casting process.
  • the material for the base layer 2 in the connected, solid state a high permeability k2 and preferably provide high porosity.
  • the adhesive as the binder B preferably cross-links the surfaces of the individual parts T of the bulk material, so that on the one hand sufficient strength is ensured and on the other hand the highest possible permeability is made possible.
  • the permeability k2 in the base layer 2 is preferably large compared to the permeability kl in the
  • the permeability k2 of the base layer 2 is preferably so large by appropriate selection of the bulk material and the binder B, that in the entire base layer 2, a uniform structure of an overpressure in supplying the compressed air L or a negative pressure during the discharge of the liquid W is possible ,
  • Permeability ratio kl: k2 of the filter layer 1 or the base layer 2 can assume any values according to first experiments. It is also possible to construct a base layer 2 with a permeability or porosity decreasing towards the filter layer 1.
  • a low-pressure casting mold can be made by applying the negative pressure pl in accordance with also other materials than, for example, gypsum, which has a high capillary action.
  • a transition region 3 is created, which enables a firm connection of the filter layer and the base layer 2 to one another. Due to the toothing effect in the transition region 3, it is advantageously possible to dispense with additional adhesives, which would be impervious to liquid and compressed air, between the two layers.
  • Fig. 3 shows a sectional view of another embodiment, wherein for simplicity only components are described, which form a difference from the embodiment of FIG.
  • the base layer 2 is divided by means of a partition wall 9 into two separate sections 8, 8 *.
  • the partition wall 9 is preferably made of a liquid-tight and / or gas-tight material.
  • Each of the two sections 8, 8 * is assigned its own second line device 53 * - 55 *.
  • the two or more different sections 8, 8 * can each independently be subjected to suppression pl, pl * and, if appropriate, pressures in the opposite direction.
  • Such an arrangement is advantageous, in particular in the case of molds and die casting molds for complex shaped ceramic articles, in order to allow a uniform pressurization over the entire back surface 7 of the filter layer 1.
  • the partition wall 9 not only make a separation of the base layer 2 in two sections 8, 8 * make * but also partially or completely pass through the filter layer 1, to divide these completely or partially into two separate sections.
  • a material for the filter layer 9 is offered in accordance with first attempts in particular plastic and / or silicone.

Landscapes

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

Abstract

L'invention concerne un moule de coulée, notamment un moule de coulée sous pression, comportant une couche de base (2), une couche filtrante perméable (1), présentant une perméabilité (k1), appliquée sur une surface de la couche de base entre cette dernière et une chambre de coulée (6), un premier ensemble conduite (50 - 52) servant à acheminer une suspension (S) dans la chambre de coulée et un deuxième ensemble conduite (53 - 55) servant à évacuer un liquide (W) présent dans la chambre de coulée à travers la couche filtrante et/ou à acheminer un fluide sous pression (L) servant à détacher une pâte formée dans la chambre de coulée. La couche de base est constituée de matières en vrac, reliées solidement les unes aux autres, présentant une perméabilité (k2) et la couche filtrante pénètre à partir de la surface de la couche de base dans cette dernière, sur une certaine distance, et est reliée à la couche de base dans cette zone. Le deuxième ensemble conduite présente éventuellement un raccord pour l'application d'un vide (p1). Un moule de coulée sous pression peut être avantageux si la couche de base et/ou la couche filtrante sont divisées par une paroi de séparation (9) en au moins deux parties (8, 8*) qui sont séparées au moyen d'une technique de pression et/ou au moyen de conduites.
EP05822037A 2004-11-25 2005-11-25 Moule de coulee, notamment moule de coulee sous pression, procede pour produire un tel moule de coulee et procede de coulee basse pression Expired - Lifetime EP1817146B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE200410056975 DE102004056975B3 (de) 2004-11-25 2004-11-25 Druckgussform und Verfahren zum Herstellen einer Druckgussform
DE200510038887 DE102005038887A1 (de) 2005-08-17 2005-08-17 Gussform für ein Niederdruck-Gussverfahren, Verfahren zum Herstellen einer solchen Gussform und Verfahren zum Niederdruckgießen
PCT/DE2005/002129 WO2006056192A2 (fr) 2004-11-25 2005-11-25 Moule de coulee, notamment moule de coulee sous pression, procede pour produire un tel moule de coulee et procede de coulee basse pression

Publications (2)

Publication Number Publication Date
EP1817146A2 true EP1817146A2 (fr) 2007-08-15
EP1817146B1 EP1817146B1 (fr) 2013-01-02

Family

ID=35976582

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05822037A Expired - Lifetime EP1817146B1 (fr) 2004-11-25 2005-11-25 Moule de coulee, notamment moule de coulee sous pression, procede pour produire un tel moule de coulee et procede de coulee basse pression

Country Status (2)

Country Link
EP (1) EP1817146B1 (fr)
WO (1) WO2006056192A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007045806A1 (de) 2007-09-25 2009-04-02 Dorst Technologies Gmbh & Co. Kg Gießformkomponente und Verfahren zum Herstellen einer Gießformkomponente
DE102009007670A1 (de) 2009-02-05 2010-08-12 Dorst Technologies Gmbh & Co. Kg Gießformkomponente, Gießform und Verwendung einer solchen Gießform

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6114906A (ja) * 1984-06-30 1986-01-23 株式会社　石川時鉄工所 屋根瓦、煉瓦、陶器ブロツク等の圧入成型方法および装置
JPS6331710A (ja) * 1986-07-26 1988-02-10 東陶機器株式会社 陶磁器加圧成形用多孔質型の製法
JPS63188003A (ja) * 1987-01-29 1988-08-03 株式会社イナックス 泥漿鋳込み用成形型
DE3719700A1 (de) * 1987-06-12 1988-12-22 Netzsch Maschinenfabrik Giessform fuer sanitaergegenstaende und verfahren zum herstellen einer solchen giessform
DE3730024A1 (de) * 1987-09-08 1989-03-16 Basf Ag Formen fuer das druckschlickergiessen zur herstellung von formteilen aus keramischen massen
JPH01210306A (ja) * 1988-02-19 1989-08-23 Sintokogio Ltd スラリー状材料成形用型およびその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006056192A3 *

Also Published As

Publication number Publication date
EP1817146B1 (fr) 2013-01-02
WO2006056192A2 (fr) 2006-06-01
WO2006056192A3 (fr) 2006-08-24

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