EP3482845B1 - Pièce moulée, moule et procédé de moulage d'une ébauche crue - Google Patents

Pièce moulée, moule et procédé de moulage d'une ébauche crue Download PDF

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Publication number
EP3482845B1
EP3482845B1 EP17201424.3A EP17201424A EP3482845B1 EP 3482845 B1 EP3482845 B1 EP 3482845B1 EP 17201424 A EP17201424 A EP 17201424A EP 3482845 B1 EP3482845 B1 EP 3482845B1
Authority
EP
European Patent Office
Prior art keywords
molded part
shell
mold
flange
molding
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.)
Active
Application number
EP17201424.3A
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German (de)
English (en)
Other versions
EP3482845A1 (fr
Inventor
Roland Menzel
Sebastian Leonhard Bauer
Benedikt Schöffmann
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
Application filed by DORST Technologies GmbH and Co KG filed Critical DORST Technologies GmbH and Co KG
Priority to EP17201424.3A priority Critical patent/EP3482845B1/fr
Priority to ES17201424T priority patent/ES2973377T3/es
Priority to JP2020526067A priority patent/JP7458972B2/ja
Priority to US16/759,375 priority patent/US11660778B2/en
Priority to CN201880073001.5A priority patent/CN111328300B/zh
Priority to PCT/EP2018/080440 priority patent/WO2019092004A1/fr
Publication of EP3482845A1 publication Critical patent/EP3482845A1/fr
Application granted granted Critical
Publication of EP3482845B1 publication Critical patent/EP3482845B1/fr
Active 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
    • B28B1/261—Moulds therefor
    • B28B1/262—Mould materials; Manufacture of moulds or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • 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
    • 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
    • B28B1/266—Means for counteracting the pressure being applied on the slip or on the moulded article in the mould, e.g. means for clamping the moulds parts together in a frame-like structure
    • 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
    • B28B7/40—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material
    • B28B7/46—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material for humidifying or dehumidifying

Definitions

  • the present invention relates to a molding for a mold, a mold with at least one molding and a method for molding a green compact.
  • Such a mold is, for example, from EP 3 162 521 A1 known.
  • the EP 3 162 521 A1 shows a mold in general form.
  • the mold has a first upper mold part and a second lower mold part.
  • the molded parts are placed between two pressed bodies and brought together by them.
  • a mold space is formed between the molded parts.
  • the molded parts each have a porous or permeable edge layer on their surface facing the mold space. Air and liquid can be drained away through this edge layer. It is conceivable that the mold has only one molded part or more than two molded parts.
  • the lower part of the mold from the EP 3 162 521 A1 has an outlet line for exhausting water or air. This outlet line is connected to the porous layer.
  • the mold and the molded parts from the EP 3 162 521 A1 are relatively large and heavy and therefore relatively difficult to handle. In addition, the drainage of the slip that is filled between the molded parts is uneven.
  • JP H07 256616 A discloses a mold with two molded parts.
  • the purpose of JP H07 256616 A is to achieve water absorption that is as uniform as possible across the entire surface of the shell.
  • a molded part for a casting mold should be provided, which enables the molding to be drained evenly.
  • a molded part in particular should be made available which enables simple production of molded articles and/or green compacts.
  • a corresponding procedure should be made available.
  • a molded part according to the invention for a casting mold in particular for a multi-part casting mold, comprises at least one shell for casting a particularly ceramic product.
  • a flange is arranged on one edge of this molded part for sealing contact with a sealing surface and in particular for sealing contact with a second molded part.
  • the shell has a first permeability to a fluid and the flange has a second permeability to the fluid.
  • the second permeability is smaller than the first permeability.
  • the permeability is defined as the volume of a fluid that can be passed through a solid per hour, per square decimeter and per pressure: l/(h*dm 2 *bar).
  • Different permeabilities for the shell and the flange enable the fluid flow to be specifically controlled within the molded part. In the present case, this means in particular that a fluid which is located in a mold space is discharged via the shell of the molded part and not via the flange of the molded part. The discharge flow is thus directed.
  • the flange is preferably cast onto the shell, in particular made in one piece with the shell.
  • the flange and the shell are therefore an integral part of the molded part and are therefore subject to the same shrinkage. Production is easier and the molded part has no unnecessary joints.
  • the shell and the flange are made of essentially the same material.
  • the material is preferably a plastic and particularly preferably PMMA.
  • Manufacturing from the same material improves the properties of the molded part.
  • the material properties are the same for the entire molded part.
  • the shell of the molded part preferably has a permeability of at least 10 l/(h*dm 2 *bar).
  • the permeability of the flange is a maximum of 1 1/(h*dm2*bar).
  • the molded part can have a seal, which is preferably designed as a circumferential seal. This seal is preferably arranged in or on the flange.
  • a gasket also makes it possible to manufacture the flange with a greater tolerance since the sealing effect can be provided via the gasket and not via the flange.
  • the flange can preferably have a recess in which the seal is inserted.
  • the seal is particularly preferably cast in the flange.
  • the depression can have an undercut.
  • the present molded part can be constructed in several parts and in particular have an inner and an outer layer.
  • the inner layer means that it faces the mold space and thus the later green compact.
  • a further aspect of the present invention relates to a casting mold with at least one and preferably two molded parts as described herein.
  • a mold enables the production of ceramic products in particular and the series production of a desired geometry.
  • a further aspect not belonging to the claimed invention relates to a molded part, in particular a molded part as described herein, at least one drainage channel being provided in the molded part.
  • the drainage channel has at least one drainage channel end, via which liquids can be removed by means of a discharge line.
  • the molded part has a releasable coupling for releasably connecting the drainage channel end to the discharge line.
  • the drainage channel end is designed as a coupling and interacts with a corresponding coupling with a press cylinder.
  • the releasable coupling can be arranged in a central region of the molded part and in particular in an area at or adjacent to the center of mass of the molded part.
  • This range is preferably selected such that moments of inertia about an axis of the coupling can be minimized.
  • the releasable coupling is preferably designed in such a way that it can be grasped by a robot.
  • the coupling not only takes on the function of discharging the water but also the function of providing an element for gripping and handling the molded part.
  • the robot preferably grips the mold using a coupling as described here.
  • the coupling can, for example, extend from the molded part through the filler body, so that when the robot grips the coupling, at least part of the mold, such as a filler body, is lifted off together with the molded part.
  • the robot grips the coupling, at least part of the mold, such as a filler body, is lifted off together with the molded part.
  • a further aspect not belonging to the claimed invention relates to a molded part for a casting mold, in particular a molded part as described herein, the molded part having a shell with a molded part surface for molding a particularly ceramic product.
  • the shell is at least partially permeable to fluid. Channels are provided in the shell so that the surface of the molded part can be acted upon by a medium and in particular by air and/or water.
  • the molded part has at least one media connection for connecting the channels to a media source and in particular to a compressed air source.
  • channels mean separately formed channels and not the fluid connections within the shell, which are formed by the pores.
  • the channels are typically designed as tubular connections.
  • the air can flow through the pores of the molded part surface to the molding located in the molded part and detach it evenly from the molded part surface without the molding becoming deformed.
  • the channels are preferably arranged in such a way that every point on the surface of the molded part is at a distance from at least one channel which is smaller than 50mm and in particular smaller than 30mm.
  • the surface of the molded part is the surface facing the mold space, i.e. the surface that is in contact with the mass or slip when the molding is formed.
  • the channels preferably extend over the shell to a side flange.
  • the media connection is preferably arranged on the flange.
  • the arrangement of the media termination on the flange makes it easier to disconnect from an air supply line, namely the media source.
  • the arrangement of the media outlet on the flange enables flow through the molded part to the end of the drainage channel.
  • the channels may run essentially radially from a central region of the shell to the flange.
  • the channels can be arranged in such a way that they do not extend to the molded surface of the shell. This means that the channels are arranged within the molded part and have a closed cross section.
  • the channels are formed as depressions in a surface and the closed cross section only forms when the molded part is arranged in the mold. A closed wall of the channels is then created by the mold and the molded part.
  • the channels in the flange preferably open into a circumferential collecting channel which is connected to the media connection.
  • the molding located in the molded part is thereby evenly exposed to compressed air, which enables the molded article to be removed evenly from the molded part.
  • a further aspect not belonging to the claimed invention relates to a molded part, preferably a molded part as described herein.
  • the molding has a porous shell and a filler to displace an unnecessary cavity.
  • the packing and the shell are connected to one another with a detachable connection.
  • the Figure 1 shows a cross section through a mold 100.
  • the mold 100 has two mold parts 1a and 1b, which are arranged one above the other in the specific exemplary embodiment.
  • a seal 14 is arranged in the molded part 1a lying at the top in the present figure.
  • the seal 14 is located in a flange 12 of the molded part 1a.
  • the molded part 1a also has a shell 11 which is connected to the flange 12.
  • the second molded part 1b is designed corresponding to the first molded part 1a with the difference that the second molded part 1b has no seal. Therefore, only the structure of one of the molded parts 1a or 1b will be explained below.
  • the molded part 1a has a shell 11 and a flange 12, with a seal 14 being located in the flange 12.
  • the drainage channel end 151 is also designed as a coupling 16.
  • the shell 12 is porous and has a molded part surface 121 which faces the molding 3.
  • Water can thus diffuse from the molding 3 through the porous shell into the drainage channels 15. It collects in the drainage channels 15 and can then be drained away via the coupling 16. To accelerate this process, a negative pressure can be generated at the coupling 16, i.e. at the drainage channel end 151.
  • the drainage channels 15 are star-shaped with the center at the coupling 16 (see Figure 2 ). They open together into a collecting channel 18.
  • the collecting channel 18 is designed as a circumferential ring channel in the flange 12. In the present case, the collecting channel 18 and the drainage channel 15 simultaneously form an air channel 17.
  • a separate media connection on the flange ie a separate air supply or air discharge line. This can extend through the flange 12 into the annular channel 18. It is also conceivable to provide a media channel network that is separate from the drainage channels 15. This can be designed in accordance with the drainage channel network and, for example, be located adjacent to or in a parallel plane to the drainage channels 15. Media connection 171 and drainage channel end 151 can be designed separately.
  • the molded parts 1a, 1b are arranged within a frame 4.
  • the cavities that form between the frame 4 and the molded parts 1a, 1b are each filled with a filler 41.
  • the filling bodies 41 are each designed as a separate element.
  • the filling bodies 41 can be connected to the respective molded part 1a or 1b with a detachable connection.
  • the Figure 2 shows a schematic top view of the molded part 1a from the Figure 1 .
  • the molded part 1a has a coupling 16 essentially centrally.
  • the drainage channels 15 are arranged in the shell 11 of the molded part 1a. These drainage channels 15 extend from the coupling 16 to the flange 12 of the molded part 1a.
  • the drainage channels 15 are arranged essentially in a star shape, with the drainage channels 15 branching out the further they are from the coupling 16. This means that the maximum distances between the individual drainage channels are limited. That is, an inside of the molded part, namely a molded part surface 121 (see Figure 1 ) is spaced from a drainage channel 15 with each point on the surface at most a certain distance (and in this case 50 mm).
  • channels are only shown in about a quarter of the shell. Of course, further drainage channels 15 also extend into the rest three quarters of the shell 11.
  • the drainage channels 15 open into a circumferential collecting channel 18 which is arranged in the flange 12 of the molded part 1a (see Figure 1 and 3k ).
  • the Figures 3a to 3o show a method for producing a molded part 1a, 1b (see Figure 1 ) as well as a preform or a green body 31 (see Figure 1 and Figure 3o ).
  • the Figure 3a shows a casting device 20 and 20 ', which are made of plaster, for example.
  • the casting devices 20 and 20' form the basis for producing the molded parts.
  • This layer is typically between 5 and 30 mm thick.
  • the Figure 3c shows the production of shell cores 23 and 23 '.
  • the molds are made from the Figure 3b A box was built and the cavity filled with plaster.
  • a release agent 25, 25' is applied to the shell cores 23 and 23'.
  • Porous mold material is introduced through the sprue opening 27, 27' ( Figure 3g ).
  • a shell 11, 11' of the later molded part 1a and 1b is formed.
  • FIG. 3k are the shells 11, 11 'from the Figure 3a shown without hatching so that drainage and/or ventilation channels 15, 17 are visible in the shell.
  • a cross section through a drainage/ventilation channel 15, 17 is also shown.
  • these channels are essentially U-shaped. After milling these channels 15, 17, they are filled with a recess material 28.
  • a next step ( Figure 3l ), the shells 11, 11' are each placed on a base 29, 29'.
  • the associated flanges 12, 12' are then cast onto the shell 11, 11'.
  • the later back sides (ie the sides facing away from the green body) of the shells 11, 11' are sealed with a material with a permeability of a maximum of 1l/(h*dm 2 *bar), so that channels 15, 17 (see Figure 3k ) must be closed.
  • a coupling 16 is used as a drainage channel end in the sealing layer with a connection to the channels 151 and/or as a media connection 171 attached.
  • a sealing groove 32 is milled.
  • the sealing groove 32 is in the Figure 3m shown as a detailed section.
  • this sealing groove has an undercut, ie the bottom of the groove is wider than at its open end.
  • a seal 14 made of silicone is then cast into this sealing groove 32, which is fixed by the undercut of the sealing groove 32.
  • the molded parts 1a and 1b are separated from each other (see Figure 3n ) and, if necessary, placed in a suitable box.
  • the resulting empty spaces are filled with a filler with a density of less than 5kg/dm 3 , which forms a packing 41.
  • the filling body can be designed in such a way that it is detachably connected or can be connected to the respective molded part 1a and 1b. Screw and/or snap connections can be provided.
  • the molded parts 1a and 1b can be assembled in a mold 100 (see Figure 3o , And also Figure 1 ). After the molded parts have been firmly clamped with a press, the material to be cast can be introduced into a cavity formed between the molded parts 1a and 1b using the coupling. A shaped body or a green body is created within this cavity.
  • Air from the slip can penetrate through the porous shell, so that a solid shard forms on the walls of the mold space as a molding that is to be sintered later.
  • the closing force exerted by the press serves as a counterforce to the slip pressure and is therefore greater than the slip pressure p.
  • the molding 1a can be used as part of the mold 100 (see Figures 3o and 3n ) with a robot on coupling 16 ( Figure 3l ) are taken.
  • the in the Figure 3o Air is blown into the coupling 16' arranged on the lower molded part 1b and a negative pressure is generated at the coupling 16 located on the upper molded part 1a.
  • the negative pressure holds the molding 31 on the molding 1a, while the introduction of air at the coupling 16 'releases the molding 31 from the molding 1b.
  • the molding can then be removed from the molding 1a. To do this, an excess pressure must be generated on the molding 1a.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Dispersion Chemistry (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Claims (8)

  1. Une pièce moulée (1) pour un moule de coulée (100), en particulier pour un moule de coulée (100) en plusieurs parties, comprenant
    au moins une coque (11) pour la coulée d'un produit, en particulier céramique, une bride (12) étant disposée sur un bord de la coque (11) pour l'application étanche contre une surface d'étanchéité (13), en particulier d'une deuxième pièce moulée (1),
    la coque (11) présentant une première perméabilité à un fluide et la bride (12) une deuxième perméabilité au fluide qui est inférieure à la première perméabilité, la perméabilité étant définie comme le volume d'un fluide qui peut être conduit à travers un corps solide par heure, par décimètre carré et par pression : l/(h*dm2*bar).
  2. Pièce moulée (1) selon la revendication 1, dans laquelle la bride (12) est moulée sur la coque (11).
  3. Pièce moulée (1) selon l'une des revendications 1 ou 2, la pièce moulée (1) et la bride (12) étant réalisées dans le même matériau, en particulier dans une matière plastique, de préférence du PMMA.
  4. Pièce moulée (1) selon l'une des revendications 1 à 3, comprenant un joint d'étanchéité (2), de préférence périphérique, le joint d'étanchéité (2) étant de préférence disposé dans ou sur la bride (12).
  5. Pièce moulée (1) selon la revendication 4, dans laquelle la bride (12) présente un renfoncement (14) dans lequel le joint (2) est inséré, notamment coulé.
  6. Pièce moulée (1) selon la revendication 5, dans laquelle la cavité (14) présente une contre-dépouille.
  7. Pièce moulée (1) selon l'une des revendications 1 à 6, caractérisée en ce que la pièce moulée (1) est constituée de plusieurs parties et présente notamment une couche intérieure et une couche extérieure.
  8. Moule (100) comprenant au moins une et de préférence deux pièces moulée (1) selon l'une des revendications 1 à 7.
EP17201424.3A 2017-11-13 2017-11-13 Pièce moulée, moule et procédé de moulage d'une ébauche crue Active EP3482845B1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP17201424.3A EP3482845B1 (fr) 2017-11-13 2017-11-13 Pièce moulée, moule et procédé de moulage d'une ébauche crue
ES17201424T ES2973377T3 (es) 2017-11-13 2017-11-13 Pieza moldeada, molde de colada y procedimiento para moldear un cuerpo verde
JP2020526067A JP7458972B2 (ja) 2017-11-13 2018-11-07 成形部品、鋳型、および圧粉体の成形方法
US16/759,375 US11660778B2 (en) 2017-11-13 2018-11-07 Molding part, casting mold and a method for forming a green body
CN201880073001.5A CN111328300B (zh) 2017-11-13 2018-11-07 铸型件、铸型和生坯模制方法
PCT/EP2018/080440 WO2019092004A1 (fr) 2017-11-13 2018-11-07 Pièce moulée, moule de coulée et procédé pour le formage d'un corps cru

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17201424.3A EP3482845B1 (fr) 2017-11-13 2017-11-13 Pièce moulée, moule et procédé de moulage d'une ébauche crue

Publications (2)

Publication Number Publication Date
EP3482845A1 EP3482845A1 (fr) 2019-05-15
EP3482845B1 true EP3482845B1 (fr) 2023-12-13

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EP17201424.3A Active EP3482845B1 (fr) 2017-11-13 2017-11-13 Pièce moulée, moule et procédé de moulage d'une ébauche crue

Country Status (6)

Country Link
US (1) US11660778B2 (fr)
EP (1) EP3482845B1 (fr)
JP (1) JP7458972B2 (fr)
CN (1) CN111328300B (fr)
ES (1) ES2973377T3 (fr)
WO (1) WO2019092004A1 (fr)

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Also Published As

Publication number Publication date
CN111328300B (zh) 2022-12-02
EP3482845A1 (fr) 2019-05-15
US20200269465A1 (en) 2020-08-27
CN111328300A (zh) 2020-06-23
WO2019092004A1 (fr) 2019-05-16
ES2973377T3 (es) 2024-06-19
JP2021502274A (ja) 2021-01-28
JP7458972B2 (ja) 2024-04-01
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