EP0496471A1 - Vefahren zum Herstellen einer Form und nach diesem Verfahren hergestellte Form zum Giessen von keramischen Gegenständen, insbesondere Sanitärartikeln - Google Patents

Vefahren zum Herstellen einer Form und nach diesem Verfahren hergestellte Form zum Giessen von keramischen Gegenständen, insbesondere Sanitärartikeln Download PDF

Info

Publication number
EP0496471A1
EP0496471A1 EP92200147A EP92200147A EP0496471A1 EP 0496471 A1 EP0496471 A1 EP 0496471A1 EP 92200147 A EP92200147 A EP 92200147A EP 92200147 A EP92200147 A EP 92200147A EP 0496471 A1 EP0496471 A1 EP 0496471A1
Authority
EP
European Patent Office
Prior art keywords
mould
shells
moulding
network
grooves
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.)
Withdrawn
Application number
EP92200147A
Other languages
English (en)
French (fr)
Inventor
Roberto Nassetti
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.)
NASSETTI ETTORE SpA
Original Assignee
NASSETTI ETTORE SpA
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 NASSETTI ETTORE SpA filed Critical NASSETTI ETTORE SpA
Publication of EP0496471A1 publication Critical patent/EP0496471A1/de
Withdrawn legal-status Critical Current

Links

Images

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
    • B28B1/263—Plastics

Definitions

  • a method normally used in the known technique of moulding ceramic articles consists of using presses fitted with permeable moulds made by using microporous plastic materials.
  • the press holds the two halves of the mould tightly closed and a concentrated suspension of clay, kaolin, feldspar and other additives are injected under pressure into the cavity.
  • the water seeps out through the porous walls of the mould and a solid layer consisting of the elements in the suspension is deposited on the inner walls to form the article.
  • By subsequently blowing compressed air through the pores in the mould the article becomes hard enough to enable it to be removed from the mould and sent on to be fired.
  • the moulds of known technique are made by pouring a polymer suspension (generally based on polymethyl methacrylate) into two boxes containing the male and female matrices to be reproduced, so as to obtain two parallelepipedons of microporous plastic internally reproducing the geometric shape of the matrix.
  • the plastic parallelepipedons then have to be subjected to an exacting process consisting in drilling a series of holes starting from the outside of the mould to within a few centimetres, orthogonally, from the surface reproducing the matrix.
  • the drilled sides are then closed by metal plates whose surfaces are provided with grooves and ducts which match with each hole, thus creating a uniform network for removing water from the mould and for subsequently blowing compressed air into the mould.
  • the holes are necessary in order to remedy the different thicknesses in the various areas of the mould, so as to ensure a sufficient water removal capacity whatever the thickness.
  • the general scope of this invention is to obviate the aforementioned problems by providing a method for rapidly and inexpensively manufacturing moulds which are both sturdy and reliable.
  • a further scope is to provide a mould made according to the aforesaid method.
  • a mould comprising at least two shells made of porous material which when coupled together define a moulding chamber corresponding to the article, characterized by the fact that the shells are housed in complementary recesses in casings made of non-porous material, networks of ducts being provided in correspondence with the faying surfaces of the shells and said of casings, said networks being provided with at least one outlet duct through said casing.
  • a method for manufacturing a mould for moulding ceramic articles comprising shells internally shaped, when coupled together, to form a cavity for moulding the article, comprising the steps of moulding the shells made of porous material with a network of grooves on their outer surface, of closing said grooves on the surface of the shells to form a network of ducts, and of moulding a casing onto each shell with at least one duct leading into the network of grooves.
  • figure 1 shows a perspective cross-section of a first element 10 used in manufacturing a mould according to the invention.
  • the element 10 has a surface 11 reproducing the surface of the matrix (shown in the accompanying drawings with a shape intended merely for illustrative purposes) from which the mould is to be obtained, but spaced at a certain distance from it, for example approximately three centimetres.
  • Figure 2 shows the element 10 assembled with the matrix 12, so as to define an interspace 13 of a substantially constant thickness, where substantially constant is understood as an even thickness except for local variations due, for example, to particularly elaborate conformations in localized areas of the article. In these areas, in fact, it is not always convenient to follow the exact shape of the article with the surface of the element 13, due both to manufacturing problems and to problems of unmoulding.
  • the surface 11 is furrowed by ribs interconnected to one another.
  • At least one inlet duct 15 and one outlet duct 16 communicate with the interspace 13, so as to enable it to be filled with a a known type of mixture which, when hardened, gives rise to a porous plastic mass.
  • the mixture can, for example, be based on polyester or acrylic resins.
  • the interconnected grooves 19 are protected by means of glued strips 20 slightly wider than the grooves, so as to be able to cast, on the side opposite the surface 18, a generically parallelepipedal-shaped casing 22 of known non-porous plastic without fear of obstructing the grooves 19.
  • the non-porous plastic can, for example, be based on thermosetting resin, such as a polyester resin or, preferably, an epoxy resin due to its low shrinkage on hardening and to its close adherence to the surfaces.
  • FIG. 4 shows the complete mould, generically indicated by reference 24, where the two halves are indicated by references 21 and 21', respectively.
  • the component parts of the half 21' are indicated by the same numbering as the corresponding parts of the half 21, described previously, with the addition of the suffix "prime".
  • the blocks of non-porous plastic (generically indicated by references 22 and 22') are provided with ducts 23, 23' to connect the network of grooves 19 and 19', respectively, with the outside, and with ducts 26 communicating with the inside of the moulding cavity.
  • the mould 24 is placed in a press 27 and the ducts 26 are fitted with pipes 28 for introduction of the aqueous clay solution to produce the article.
  • the ducts 23, 23' are fitted to pipes 25, 25' for the usual operations of removing the water and subsequently blowing in compressed air.
  • moulding the article then proceeds according to the known technique by injecting the clay suspension, draining off the water through the porous layer 17, 17', blowing in air under pressure to harden the article and lastly raising the press to open the mould and remove the article ready for further processing.
  • the mould is consequently very sturdy and free from stress raisers, which are normally found in the embodiments of known technique with metal plates for retaining and connecting the ducts.
  • the network of ducts made in the interface between the porous part and the non-porous part of the mould can differ from the one shown. It will be obvious to any expert technician that the network can be made with different densities from one part of the mould to another according to particular moulding requirements due, for example, to the particle shape of the article to be obtained. Likewise, the generically constant thickness of the porous shells can be subject to local variations due to particular moulding requirements.
  • the network of grooves in the interface can obviously also be achieved by machining the wall of the shell initially moulded smooth.
  • the network of ducts is described as a single communicating network, as will be obvious to any expert technician, it can also be made in the form of a plurality of separate networks each provided with its own ducts connecting it to the outside, so as to enable the blowing in and drainage operations to be differentiated both as regards pressure and as regards temporal sequence.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds, Cores, Or Mandrels (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
EP92200147A 1991-01-23 1992-01-20 Vefahren zum Herstellen einer Form und nach diesem Verfahren hergestellte Form zum Giessen von keramischen Gegenständen, insbesondere Sanitärartikeln Withdrawn EP0496471A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI910146A IT1247096B (it) 1991-01-23 1991-01-23 Metodo di realizzazione di uno stampo e stampo secondo tale metodo per la formatura di manufatti ceramici,in particolare sanitari.
ITMI910146 1991-01-23

Publications (1)

Publication Number Publication Date
EP0496471A1 true EP0496471A1 (de) 1992-07-29

Family

ID=11358213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92200147A Withdrawn EP0496471A1 (de) 1991-01-23 1992-01-20 Vefahren zum Herstellen einer Form und nach diesem Verfahren hergestellte Form zum Giessen von keramischen Gegenständen, insbesondere Sanitärartikeln

Country Status (2)

Country Link
EP (1) EP0496471A1 (de)
IT (1) IT1247096B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2372958A (en) * 2001-03-06 2002-09-11 Ceram Res Ltd Mould assemblies
FR2846271A1 (fr) * 2002-10-29 2004-04-30 Elmeceram Moule pour la fabrication d'articles en ceramique par coulage sous pression
CN103722615A (zh) * 2014-01-10 2014-04-16 兆峰陶瓷（北京）洁具有限公司 用于制作卫生洁具的高压模具及其制备方法
CN103934880A (zh) * 2014-03-07 2014-07-23 北京大学 一种高温陶瓷材料点阵夹芯板的一体化凝胶注模制备方法
EP4032674A3 (de) * 2021-01-20 2022-09-21 Dorst Technologies GmbH & Co. KG Verfahren zum herstellen eines formteils für eine schlicker-druckgiessform

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE910154C (de) * 1951-01-10 1954-04-29 Gottfried Cremer Dr Pressform
US3156751A (en) * 1961-12-06 1964-11-10 Crane Co Mold for forming a ceramic article and method of making the mold
US3286974A (en) * 1962-05-09 1966-11-22 Mc Graw Edison Co Ceramic mold
US3993727A (en) * 1974-12-18 1976-11-23 Wallace-Murray Corporation Fluid-release mold and the method of manufacturing the same
US4413966A (en) * 1981-06-26 1983-11-08 Wallace Murray Corporation Fluid-release mold and the method of manufacturing the same
FR2601895A1 (fr) * 1986-07-26 1988-01-29 Toto Ltd Moule poreux pour coulee en barbotine et son procede de fabrication
JPH0195003A (ja) * 1987-10-08 1989-04-13 Toshiba Corp セラミックス鋳込成形用鋳型
JPH01103408A (ja) * 1987-10-17 1989-04-20 Noritake Co Ltd 陶磁器成形型の製造方法
JPH0292503A (ja) * 1988-09-29 1990-04-03 Tokai Rubber Ind Ltd 無機質製品用透水性樹脂型

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE910154C (de) * 1951-01-10 1954-04-29 Gottfried Cremer Dr Pressform
US3156751A (en) * 1961-12-06 1964-11-10 Crane Co Mold for forming a ceramic article and method of making the mold
US3286974A (en) * 1962-05-09 1966-11-22 Mc Graw Edison Co Ceramic mold
US3993727A (en) * 1974-12-18 1976-11-23 Wallace-Murray Corporation Fluid-release mold and the method of manufacturing the same
US4413966A (en) * 1981-06-26 1983-11-08 Wallace Murray Corporation Fluid-release mold and the method of manufacturing the same
FR2601895A1 (fr) * 1986-07-26 1988-01-29 Toto Ltd Moule poreux pour coulee en barbotine et son procede de fabrication
JPH0195003A (ja) * 1987-10-08 1989-04-13 Toshiba Corp セラミックス鋳込成形用鋳型
JPH01103408A (ja) * 1987-10-17 1989-04-20 Noritake Co Ltd 陶磁器成形型の製造方法
JPH0292503A (ja) * 1988-09-29 1990-04-03 Tokai Rubber Ind Ltd 無機質製品用透水性樹脂型

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 13, no. 305 (M-849)(3653) 13 July 1989 & JP-A-1 095 003 ( TOSHIBA CORP. ) 13 April 1989 *
PATENT ABSTRACTS OF JAPAN vol. 13, no. 318 (M-852)(3666) 19 July 1989 & JP-A-1 103 408 ( NORITAKE CO. LTD. ) 20 April 1989 *
PATENT ABSTRACTS OF JAPAN vol. 14, no. 291 (M-989)(4234) 22 June 1990 & JP-A-2 092 503 ( TOKAI RUBBER IND. LTD. ) 3 April 1990 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2372958A (en) * 2001-03-06 2002-09-11 Ceram Res Ltd Mould assemblies
GB2372958B (en) * 2001-03-06 2004-10-27 Ceram Res Ltd Mould assemblies
FR2846271A1 (fr) * 2002-10-29 2004-04-30 Elmeceram Moule pour la fabrication d'articles en ceramique par coulage sous pression
CN103722615A (zh) * 2014-01-10 2014-04-16 兆峰陶瓷（北京）洁具有限公司 用于制作卫生洁具的高压模具及其制备方法
CN103722615B (zh) * 2014-01-10 2017-03-29 兆峰陶瓷（北京）洁具有限公司 用于制作卫生洁具的高压模具及其制备方法
CN103934880A (zh) * 2014-03-07 2014-07-23 北京大学 一种高温陶瓷材料点阵夹芯板的一体化凝胶注模制备方法
CN103934880B (zh) * 2014-03-07 2016-04-06 北京大学 一种高温陶瓷材料点阵夹芯板的一体化凝胶注模制备装置及方法
EP4032674A3 (de) * 2021-01-20 2022-09-21 Dorst Technologies GmbH & Co. KG Verfahren zum herstellen eines formteils für eine schlicker-druckgiessform

Also Published As

Publication number Publication date
IT1247096B (it) 1994-12-12
ITMI910146A1 (it) 1992-07-23
ITMI910146A0 (it) 1991-01-23

Similar Documents

Publication Publication Date Title
US5824250A (en) Gel cast molding with fugitive molds
EP1616641B1 (de) Verbindung von verlorenen Modellen und Herstellungsverfahren
EP0496471A1 (de) Vefahren zum Herstellen einer Form und nach diesem Verfahren hergestellte Form zum Giessen von keramischen Gegenständen, insbesondere Sanitärartikeln
US4620584A (en) Green sand mold filling system
BG65355B1 (bg) Метод за отливане на керамични изделия и съоръжение за осъществяването му
CA2373428C (en) A method of making a ceramic ornament having short undercuts on surface thereof
US4842037A (en) Metal casting patterns
US4288238A (en) Process and mould for the manufacture of multi-walled hollow bodies, especially of glass
EA002626B1 (ru) Форма для литья фигурных изделий из бетонной смеси и способ изготовления элементов дренажной системы с ее использованием
EP1385680B1 (de) Formelement zum formen von artikeln durch schlickergiessen mit ton oder dergleichen und herstellungsverfahren dafür
JPH05138295A (ja) 鋳造用セラミツクス製複合中子の製造方法
PL82152B1 (en) Moulding method and apparatus [gb1397821a]
US6010655A (en) Method of making a ceramic ornament having short undercuts on surface thereof
US2834077A (en) Method of producing patterns for cored castings
JP7458972B2 (ja) 成形部品、鋳型、および圧粉体の成形方法
SU1426692A1 (ru) Способ изготовлени литейных форм вакуумной формовкой и оснастка дл испытани формовочных материалов
JPH03180247A (ja) 水溶性中子を用いた消失可能鋳型の製造方法
JP2536972B2 (ja) Ｕ字溝の製造装置および成形方法
SU1022775A1 (ru) Модель дл изготовлени литейных форм методом вакуумно-пленочной формовки
JPH03203603A (ja) 繊維強化セラミックス中空成形体の製造方法
JPH07214236A (ja) 鋳型の製造方法
JPH0539854Y2 (de)
RU2151667C1 (ru) Литейная форма для отливок с армирующими элементами и оснастка для ее изготовления
JP2004188447A (ja) 鋳造砂型製造用の模型
SU1315107A1 (ru) Подмодельна плита дл вакуумной формовки

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19930130