EP0389234A2 - Moules hermétiques aux liquides pour le moulage de barbotine et procédé pour leur fabrication - Google Patents

Moules hermétiques aux liquides pour le moulage de barbotine et procédé pour leur fabrication Download PDF

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Publication number
EP0389234A2
EP0389234A2 EP90302956A EP90302956A EP0389234A2 EP 0389234 A2 EP0389234 A2 EP 0389234A2 EP 90302956 A EP90302956 A EP 90302956A EP 90302956 A EP90302956 A EP 90302956A EP 0389234 A2 EP0389234 A2 EP 0389234A2
Authority
EP
European Patent Office
Prior art keywords
mold
mating
filter
material 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
EP90302956A
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German (de)
English (en)
Other versions
EP0389234B1 (fr
EP0389234A3 (fr
Inventor
Kuniyoshi C/O Enokido Kojo Kohmura
Takeshi C/O Enokido Kojo Ito
Kazushige C/O Enokido Kojo Murata
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.)
Inax Corp
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Inax Corp
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Publication date
Application filed by Inax Corp filed Critical Inax Corp
Publication of EP0389234A2 publication Critical patent/EP0389234A2/fr
Publication of EP0389234A3 publication Critical patent/EP0389234A3/fr
Application granted granted Critical
Publication of EP0389234B1 publication Critical patent/EP0389234B1/fr
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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
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/0002—Auxiliary parts or elements of the mould
    • B28B7/0011—Mould seals
    • 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

Definitions

  • This invention relates to a liquid-tight mold for cast-­molding a slip under pressure to facilitate deposition of the slip, and a method for producing the mold. More particularly, this invention relates to improvement of conventional molds in increasing liquid-tight properties of the molds, enhancing performance of cast-molding operation, and preventing such molds from breaking.
  • Cast-molding under pressure wherein a slip is pressurized during deposition of the slip, has been widely used for producing green articles of sanitary ware such as stool ware, wash basin and the like.
  • the molded articles are then fired into ceramic articles.
  • an object of the present invention is to provide a novel mold for cast-molding a slip under pressure, wherein the above-mentioned problems in conventional casting molds are eliminated by the use of both a resilient material layer and a sealing material layer in combination.
  • Another object of the invention is to provide a method for producing the mold.
  • the present inventors have found that such problems can be eliminated by providing the conventional divisible mold comprising mating filter layers with a sealing material layer at least on a mating filter surface of at least one mold portion to be mated and a resilient material layer at least on a part of the sealing layer or another mating filter surface.
  • a mold (1) for cast-molding a slip under pressure which comprises a divisible casting mold (1) including at least two mold portions (5, 6) to form a slip-depositing mold cavity (18) when mated together; each mold portion comprising an air-tight housing (4) and a filter layer (2) of continuously porous structure inside of the housing (4); a slip supply duct (17) being connected with said mold cavity and communicated with the outside of the housing (4): characterized in that a sealing material layer (11) is attached onto at least the whole mating filter surface (16) of at least one mold portion; and a resilient material layer (10) is attached onto one of the sealing material layer (11) and another mating filter surface (16) (generally unnecessary to install them on the both surfaces), along slip-depositing divisible surfaces (12) of the filter layers (2); whereby the mold portions (8,9) mated together are provided with a resilient liquid-tight zone (14) between the mating filter surfaces (16).
  • the mold can be successfully produced by a method which comprises coating at least the whole mating filter surface (16) of at least one mold portion (8,9) to be mated, with a sealing compound; applying a releasing material (e.g. a release agent or a release film or paper) between the mating mold portions (8,9), mating the mold portions, and hardening the sealing compound to provide a sealing material layer (11); and then bonding a resilient material sheet (10) onto one of the resulting sealing material layer (11) and another mating filter surface (16), along slip-depositing divisible surfaces (12) of the filter layers (2); whereby the mold portions (8,9) mated together are provided with a resilient liquid-tight zone (14) between the mating filter surfaces (16).
  • a releasing material e.g. a release agent or a release film or paper
  • the air-tight housing can comprise a reinforcing housing 4 for the mold and a supporting layer for the filter layer installed between the housing and the filter layer.
  • the filter layer in each mold portion can include therein fluid-flowing conduits 7 connected with a fluid-flowing duct to communicate with the outside of the housing.
  • the fluid-flowing conduits 7 normally comprise curved porous cords or tubes arranged along the shape of the mold cavity 18, and/or straight blind holes installed towards the mold cavity 18.
  • the thin resilient material layer 10 employed in the present invention unexpectedly serves to give a durable liquid-­tight zone 14 between the mated filter surfaces 16 of the mold, to hold and sink possible foreign matter pieces in the resilient layer, and to give a small clearance between the mated filter surfaces and protect the filter surfaces from fracture due to the foreign matter pieces.
  • the thickness of the resilient layer 10 is generally selected to hold and sink possible foreign matter pieces therein and not to substantially deteriorate uniform filtering performance of the slip-depositing surfaces.
  • the width and elasticity of the resilient layer is generally selected to be readily compressed by relatively weak clamping force of the mating mold portions.
  • the thin sealing material layer 11 in the present invention serves to protect the mating filter surfaces, to correct the surface conditions of the mating mold portions, to give air-tight properties to the mating filter surfaces for facilitating suction and pressurization of the filter layers, and to give good bonding properties with the resilient layer 10 to the mating filter layer.
  • the thickness of the sealing layer 11 is generally selected to firmly adhere to the mating filter layer and not to substantially deteriorate uniform filter performance of the slip-depositing surfaces 12.
  • the sealing material layer 11 may be attached onto one or both of the whole mating filter surfaces 16 of the mold portions.
  • the sealing layer may extend onto the mating supporting layer, as necessary.
  • the thickness of the sealing layer is usually 0.1 to 8 mm, preferably 0.3 to 1 mm.
  • the sealing material can be used ordinary sealing compounds and preferably resinous sealing compounds comprising epoxy, urethane, silicone, polyester, phenol resin components, etc.
  • the sealing material may be a commercially available resinous putty compound comprising resin materials and fillers.
  • the resilient material layer 10 is attached onto at least a part of the sealing layer or another mating filter surface 16 of a mold portion, along slip-depositing divisible surfaces 12 of the mated filter layers and preferably apart from the slip-depositing surface with a receding distance (a) of at least 1 mm.
  • the distance (a) is usually 1 to 20 mm, preferably 3 to 10 mm.
  • the filter layer is prevented from breaking and sufficient liquid-tight properties of the mold is obtained. This is because the clearance formed between the mating filter surfaces of the mold portions works to decrease the repulsive pressure of the foreign matter exerted upon the mating filter surfaces.
  • the resilient material can be used resilient rubber-­like or sponge-like sheets having elasticity to form a liquid-­tight zone 14 when compressed, such as non-porous silicone or urethane rubber sheets as well as polyurethane sponge sheets.
  • substantially closed cell sponge materials are used because a slip does not permeate into the porous cells and elasticity of the sponge material is maintained to provide sufficient liquid-tight properties of the mold.
  • Polyurethane or other synthetic rubber sponge materials are exemplified as a preferred sponge material.
  • the thickness of the resilient layer is usually 0.2 to 5 mm, and preferably 0.3 to 3mm.
  • the width (b) of the resilient layer is usually about 3 to 100 mm, preferably 4 to 50 mm.
  • the resilient layer may cover a mating mold surface ranging from a part of the mating filter surface to both the mating filter surface and mating supporting layer surface.
  • the resilient layer 10 can be bonded onto the sealing layer 11 or another mating filter surface with an adhesive.
  • Epoxy or urethane resin adhesives are generally used as a preferred adhesive.
  • FIG. 2 A cross-sectional view of a conventional casting mold is shown in FIG. 2.
  • Mold 1 is for cast-molding a wash basin, and a blank portion 18 within the mold is a mold cavity for molding the basin.
  • the mold 1 comprises a filter layer 2, a supporting layer 3, and a pressure-resistant reinforcing housing 4 in a pile from the mold cavity outwardly.
  • the mold is divisible into an upper mold portion 5 and a lower mold portion 6.
  • the filter layer 2 is generally composed of a porous synthetic resin or gypsum
  • the supporting layer 3 is generally composed of a non-porous synthetic resin or cement mortar containing sand
  • the pressure-resistant reinforcing layer 4 is generally composed of iron plates or iron frames and paint.
  • fluid-flowing conduits 7 such as porous tubes 7 for suction and drainage of water contained in a slip during cast-­molding and for supplying water under pressure to form a water film on the slip-depositing surfaces 2a during demolding the molded article.
  • a slip (a slurry of mineral powder for molding green articles) is supplied via a slip-supply duct 17 to a mold cavity formed in a divisible casting mold and pressurized to drive unnecessary liquid (e.g. water) contained in the slip into the mold, whereby the mineral components deposit onto the inner surfaces 2a of the mold.
  • Remaining excess slip is drained from the mold cavity via the slip-supply duct 17 by setting the duct 17 to a gravitationally low position, when a hollow article is to be obtained. Then, the mold is divided into mold portions to take out a molded green article.
  • liquid-tight properties of the mold are sometimes lost to lead leaking of the slip in the case where (1) there is an uneven portion in the mating surfaces, (2) foreign matter such as hardened clods of the slip or fragments of the mold materials enter between the mating surfaces of the mold, or (3) the filter layer is chipped off, which sometimes occurs when the mold portions 5,6 are strongly pressed to each other with foreign matter sandwiched between the mating filter surfaces because the filter layers are porous, weak and fragile.
  • a slip-depositing surface 12 of the filter layers along the mating surfaces is chipped off, the resulting molded article suffers from a flash-like projection having a shape similar to the chipped portion and is deteriorated in surface properties thereof.
  • FIG. 1 shows an enlarged cross-sectional view of the essential part of a mold for cast-molding a slip under pressure according to the present invention.
  • the essential part corresponds to the part A in FIG. 2 showing a conventional mold.
  • the mold is divided into an upper mold portion 8 (corresponding to the portion 5 in FIG. 2) and a lower mold portion 9 (corresponding to the portion 6 in FIG. 2), which comprise supporting layers 3 and filter layers 2 of a continuously porous epoxy resin material.
  • a sealing resin layer 11 is attached onto the mating surface of the lower mold portion 9, and the sealing resin layer 11 is not provided on the mating surface of the upper mold portion 8.
  • the sealing layer 11 is produced with an epoxy resin putty compound.
  • the sealing layer 11 is formed, for example, by coating the mating surface of the lower mold portion 9 with the epoxy resin sealing compound about 0.6 mm in thickness and applying a release agent (e.g. silicone or wax) onto the mating surface of the upper mold portion 8, and then mating the mold portions 8 and 9 to harden the resinous compound.
  • a release agent e.g. silicone or wax
  • the mating surface patterns of the upper mold portion 8 are transfered to the surface of the resulting hardened resin layer on the lower mold portion. After the resinous compound is substantially hardened, the mated mold portions, 8 and 9 are separated.
  • the resinous sealing layer about 0.5 mm thick can be readily separated from the mating surface of the upper mold portion 8 and is firmly adhered to that of the lower mold portion 9.
  • the sealing compound somewhat permeates into the filter layer and supporting layer, and then hardens to firmly adhere thereto.
  • the fins can be cut off after the resinous compound is hardened.
  • a resilient material layer 10 is attached onto the resinous sealing layer 11 installed on the mating filter surface 16 of the lower mold portion 9.
  • a polyurethane sponge sheet is used as the resilient material.
  • the resilient material layer 10 is about 15 mm in width (b) and about 1.5 mm in thickness.
  • the resilient material layer 10 is adhered onto the sealing layer 11 with an epoxy resin adhesive at a position about 6 mm apart from the slip-depositing surfaces 12 of the mold portions.
  • the both mold portions 8 and 9 mated together may provide some liquid-tight properties of the mold because the resinous sealing layer 11 is sandwiched between the mating surfaces 15,16 of the mold portions 8 and 9. Moreover, since the resilient material layer 10 is provided on one of the mating surfaces, the mating surfaces of the mold portions 8 and 9 mate together to form a liquid-tight zone 14, even when the mating position of these mold portions 8 and 9 is slightly slipped off.
  • FIGS. 3 and 4 show another embodiment of the present invention, in which a supporting layer 3 is not employed and a filter layer 2 directly contacts a pressure-resistant reinforcing housing 4.
  • the materials of the sealing layer 11 and resilient layer 10 used herein are the same as in Example 2.
  • the sealing layer 11 is about 0.5 mm thick.
  • the casting mold according to Example 3 brings about substantially the same effects as in Example 2, because the mold does not need a large clamping force when mating the mold portions and the filter layers are durable without the supporting layers.
  • a sealing layer 11 is attached onto the whole mating surface of a mold portion in Examples 2 and 3, it is possible to form a sealing layer 11 only on the mating surface of the filter layer 2 or on the whole mating filter layer surface and a part of the supporting layer surface. Moreover, a sealing layer 11 may be attached onto the both mating surfaces of the mold portions, as necessary.
  • the present invention is explained by way of examples for molding a wash basin to be built in a washing stand, which employ an upper mold portion and a lower mold portion.
  • the invention is not restricted to such a mold including two mold portions, and is applicable, for example, to a mold for cast-molding other articles such as stool sanitary ware which employs an upper mold portion, a lower mold portion and a side mold portion(s), and as necessary core mold pieces.
  • the sealing layers and resilient layers are provided between the respective mating surfaces of these mold portions.
  • pressurization of the slip is generally at least 0.5 Kg/sq.cm (5MPa) and normally 1 Kg/sq.cm (10MPa) of gauge or more.
  • the slip is pressurized to 10 ⁇ 100 MPa to facilitate deposition thereof.
  • the repulsive pressure of the foreign matter exerted upon the mated filter layers 2 will be decreased by the resilient layer 10 sand­wiched between them, thereby preventing the mating filter surfaces from breaking. Namely, in the case where the foreign matter is located on the resilient layer 10, the foreign matter sinks in the resilient layer 10 upon mating the mold portions 8 and 9. Thus, by the elasticity of the resilient layer 10, liquid-tight properties at the mating surfaces of the mold portions 8 and 9 can be retained and the repulsive pressure of the foreign matter upon the mated filter layers 2 will be decreased.

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  • 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)
  • Moulds For Moulding Plastics Or The Like (AREA)
EP19900302956 1989-03-20 1990-03-20 Moules hermétiques aux liquides pour le moulage de barbotine et procédé pour leur fabrication Expired - Lifetime EP0389234B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3189689U JPH0525850Y2 (fr) 1989-03-20 1989-03-20
JP31896/89 1989-03-20

Publications (3)

Publication Number Publication Date
EP0389234A2 true EP0389234A2 (fr) 1990-09-26
EP0389234A3 EP0389234A3 (fr) 1991-05-02
EP0389234B1 EP0389234B1 (fr) 1994-03-02

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ID=12343782

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Application Number Title Priority Date Filing Date
EP19900302956 Expired - Lifetime EP0389234B1 (fr) 1989-03-20 1990-03-20 Moules hermétiques aux liquides pour le moulage de barbotine et procédé pour leur fabrication

Country Status (4)

Country Link
EP (1) EP0389234B1 (fr)
JP (1) JPH0525850Y2 (fr)
DE (1) DE69006875T2 (fr)
ES (1) ES2054239T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0463376A2 (fr) * 1990-06-28 1992-01-02 Inax Corporation Elément d'étanchéité pour moule de coulage en barbotine sous pression
EP3482845A1 (fr) * 2017-11-13 2019-05-15 Dorst Technologies GmbH & Co. KG Pièce moulée, moule et procédé de moulage d'une ébauche crue

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB468641A (en) * 1936-01-17 1937-07-09 John James Improvements relating to casting moulds for clay
GB792351A (en) * 1954-12-27 1958-03-26 Shenango China Inc Dies for pressing green ceramic objects
US3993727A (en) * 1974-12-18 1976-11-23 Wallace-Murray Corporation Fluid-release mold and the method of manufacturing the same
FR2349773A1 (fr) * 1976-04-30 1977-11-25 Dowty Seals Ltd Perfectionnements a des joints d'etancheite
JPS56124237A (en) * 1980-03-04 1981-09-29 Toshiba Corp Method for resin sealing
FR2601896A1 (fr) * 1986-07-26 1988-01-29 Toto Ltd Procede de fabrication d'un moule pour coulee en barbotine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB468641A (en) * 1936-01-17 1937-07-09 John James Improvements relating to casting moulds for clay
GB792351A (en) * 1954-12-27 1958-03-26 Shenango China Inc Dies for pressing green ceramic objects
US3993727A (en) * 1974-12-18 1976-11-23 Wallace-Murray Corporation Fluid-release mold and the method of manufacturing the same
FR2349773A1 (fr) * 1976-04-30 1977-11-25 Dowty Seals Ltd Perfectionnements a des joints d'etancheite
JPS56124237A (en) * 1980-03-04 1981-09-29 Toshiba Corp Method for resin sealing
FR2601896A1 (fr) * 1986-07-26 1988-01-29 Toto Ltd Procede de fabrication d'un moule pour coulee en barbotine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 5, no. 205 (E-88)[877], 25th December 1981; & JP-A-56 124 237 (TOKYO SHIBAURA DENKI K.K.) 29-09-1981 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0463376A2 (fr) * 1990-06-28 1992-01-02 Inax Corporation Elément d'étanchéité pour moule de coulage en barbotine sous pression
EP0463376A3 (en) * 1990-06-28 1992-03-04 Inax Corporation Sealing construction for a pressure casting mold
EP3482845A1 (fr) * 2017-11-13 2019-05-15 Dorst Technologies GmbH & Co. KG Pièce moulée, moule et procédé de moulage d'une ébauche crue
CN111328300A (zh) * 2017-11-13 2020-06-23 道尔斯特技术有限两合公司 铸型件、铸型和生坯模制方法
US11660778B2 (en) 2017-11-13 2023-05-30 Dorst Technologies Gmbh & Co. Kg Molding part, casting mold and a method for forming a green body

Also Published As

Publication number Publication date
JPH0525850Y2 (fr) 1993-06-30
ES2054239T3 (es) 1994-08-01
EP0389234B1 (fr) 1994-03-02
JPH02121905U (fr) 1990-10-04
DE69006875D1 (de) 1994-04-07
DE69006875T2 (de) 1994-09-22
EP0389234A3 (fr) 1991-05-02

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