EP0480430B1 - Procédé et dispositif pour la fabrication d'objets creux en céramique avec appendice latéral, en particulier de tasses avec anse - Google Patents

Procédé et dispositif pour la fabrication d'objets creux en céramique avec appendice latéral, en particulier de tasses avec anse Download PDF

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Publication number
EP0480430B1
EP0480430B1 EP91117307A EP91117307A EP0480430B1 EP 0480430 B1 EP0480430 B1 EP 0480430B1 EP 91117307 A EP91117307 A EP 91117307A EP 91117307 A EP91117307 A EP 91117307A EP 0480430 B1 EP0480430 B1 EP 0480430B1
Authority
EP
European Patent Office
Prior art keywords
hollow body
appendage
die
handle
shaped
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.)
Expired - Lifetime
Application number
EP91117307A
Other languages
German (de)
English (en)
Other versions
EP0480430A2 (fr
EP0480430A3 (en
Inventor
Günther Söthje
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.)
Erich Netzsch GmbH and Co Holding KG
Original Assignee
Erich Netzsch GmbH and Co Holding 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 Erich Netzsch GmbH and Co Holding KG filed Critical Erich Netzsch GmbH and Co Holding KG
Publication of EP0480430A2 publication Critical patent/EP0480430A2/fr
Publication of EP0480430A3 publication Critical patent/EP0480430A3/de
Application granted granted Critical
Publication of EP0480430B1 publication Critical patent/EP0480430B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/02—Apparatus or processes for treating or working the shaped or preshaped articles for attaching appendages, e.g. handles, spouts
    • 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
    • B28B1/002—Producing shaped prefabricated articles from the material assembled from preformed elements
    • 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
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/003—Pressing by means acting upon the material via flexible mould wall parts, e.g. by means of inflatable cores, isostatic presses

Definitions

  • the invention relates to a method according to the preamble of claim 1 and a device according to the preamble of claim 5.
  • a pressing tool is known with which a cup-shaped ceramic hollow body is to be pressed together with a side attachment in the form of a handle in one operation from free-flowing ceramic mass.
  • the device has a lower molded part designed as a male part, over which a cup-shaped first membrane is placed, and two upper molded parts, which can be placed against one another in a meridian plane of the hollow body to be pressed and its handle-shaped attachment and together form a female part.
  • a core can be displaced in the matrix transversely to this meridian plane, around which a tubular second membrane extends in the meridian plane for isostatic pressing of the handle-shaped attachment.
  • Both membranes delimit the part of the mold cavity assigned to them from the inside.
  • a pressure ram which, in an upper position pulled out of the die, releases a filling channel for free-flowing ceramic mass and an evacuation channel.
  • the common mold cavity for the cup-shaped hollow body and its handle-shaped attachment are filled with ceramic mass from above.
  • the plunger is then lowered into the die so that it closes off the mold cavity.
  • Pressure oil is then introduced under the cup-shaped first membrane and into the tubular second membrane, so that the ceramic mass of both membranes is pressed isostatically against the cup-shaped or handle-shaped inner walls of the male part.
  • the plunger After the isostatic pressing, the plunger is moved up a little, the core with the second membrane is pulled out of the associated part of the mold cavity and the two mold parts of the die are moved apart so that the hollow body pressed in one piece with its handle-shaped attachment is removed can.
  • the invention is therefore based on the object to provide an isostatic pressing method and a device suitable for carrying out the method, with which ceramic hollow bodies with a lateral attachment, in particular handle cups, can be pressed in such a way that damage occurs during removal and also during subsequent firing of the pressed moldings can be avoided with greater certainty.
  • the object is, insofar as it relates to the method, according to the invention, based on a method according to the preamble of claim 1, achieved in that a hollow body is produced without an attachment in a first operation and the attachment is produced in a second operation and thereby by the isostatic pressing pressure with the Hollow body is connected.
  • the device shown is used for isostatic pressing of cups, each consisting of a cup-shaped hollow body 10 with, for example, a cylindrical outer wall 12 and a bottom 14 and a shoulder 16 fastened to the wall 12.
  • the approach 16 has shown in the Example, the shape of a conventional cup handle with two connecting surfaces 18 with which it is attached to the wall 12.
  • the molding tool 20 shown in FIG. 1 is provided for isostatic pressing of the cup-shaped hollow body 10.
  • Its main components are a plate 22 which is to be fastened in the usual way to a table (not shown) of a preferably lying press and has an essentially cylindrical recess 24 and a fluid channel 26 opening into it.
  • a shaped part 28 is received, in which an elastic membrane 30 is inserted. This is clamped on its outer edge between a support ring 32 and a clamping ring 34 which is fastened to the plate 22 with screws 36.
  • the membrane 30 has a substantially concave inner surface, which points to the left in FIG. 1, which is complementary to the outer surface of the hollow body 10 to be pressed, and a rear surface which rests on the molded part 28 when the membrane is at rest.
  • the molded part 28 contains channels 38 which connect the fluid channel 26 to the rear of the membrane 30.
  • the fluid channel 26 can, as usual, be connected alternately to a vacuum source and to a pressure oil source, so that the membrane 30 can be sucked into the molded part 28 during each operating cycle and then pressed away from it.
  • the molding tool 20 also has a plate 40 shown on the left in FIG. 1, which is to be fastened to a ram 42 of the press mentioned only and has on its side facing the molded part 28 a molded part 44 designed as a male part, the surface of which towards the inner surface of the pressing hollow body 10 is complementary.
  • a mold cavity 46 is formed, which can be filled through a filling channel 48 with free-flowing ceramic mass of the usual grain size.
  • a further molding tool 50 is provided for isostatic pressing of the projection 16, which is shown individually in FIGS. 2 and 3.
  • the main component of the molding tool 50 is a lower plate 52 in the example shown with a recess 54 into which a fluid channel 56 opens and in which a molding 58 designed as a die is received.
  • the clamping ring 64 is fastened to the plate 52 with screws 66.
  • the membrane 60 forms the entire outer surface of the projection 16 to be pressed and can be sucked into the molding 58 in each working cycle by channels 68 in the molded part 58, which communicate with the fluid channel 56, and then pressed away from it.
  • the molding tool 50 works in the usual way, as does the molding tool 20.
  • the mold 50 also includes two upper plates 70 and 70 ', which lie against one another in a common central plane of the cup-shaped hollow body 10 and its shoulder 16, which is referred to as the meridian plane M when the mold 50 is closed, as in FIGS. 2 and 3 and also shown in Figs. 4 and 5.
  • the two plates 70 and 70 ' are suspended from a common support body 72 and guided in such a way that they can be displaced towards and away from one another normal to the meridian plane M, symmetrical to the latter.
  • a molded part 74 and 74 ' is formed on the underside of each of the two plates 70 and 70'; these two molded parts together form a male part which, together with the membrane 60, delimits a mold cavity 76 for the isostatic pressing of the handle-shaped extension 16.
  • the mold cavity 76 has two openings 78 which lie in a hollow cylindrical contact surface 80, 80 'formed on the upper side of the two plates 70 and 70'.
  • the mold cavity 76 can be filled with free-flowing ceramic mass.
  • a filling device can be used, which can be placed on the contact surface 80, 80 'and has two outlets which can be brought into register with one of the two coins 78.
  • At least two vertical bolts 82 are fastened to the lower plate 52, which have a dimensionally ground surface and are each guided in a correspondingly machined bushing 84 in the plate 70 or 70 '.
  • the plate 52 together with the molded part 58 and membrane 60 can be applied from below in a closing movement to the two plates 70 and 70 'if these have previously been brought into the position according to FIGS. 3 and 5, in which they are in the meridian plane M lie together.
  • Appropriate but horizontal bolts 86 and bushings 88 are provided in the illustrated example as guides for the movements of the two plates 70 and 70 'normal to the meridian plane M.
  • the orifices 78 of the mold cavity 76 filled with ceramic granulate must be closed. This is done in that a cup-shaped hollow body 10 previously pressed in the mold 20 according to FIG. 1 with its cylindrical outer wall 12 is pressed tightly onto the mouths 78.
  • the hollow body 10 is removed from the mold 20 and clamped between a support body 90 penetrating into it and a counter-holder 92 placed on its base 14 from the outside and then brought into the position according to FIGS. 4 and 5.
  • Support body 90 and counter-holder 92 both of which have a cylindrical outer surface, are displaceably guided in a piston-like manner in a cylinder bore 94 of the support body 72 and are each connected to a hydraulic or pneumatic piston-cylinder unit 96 or 98. These are controlled in such a way that the cup-shaped hollow body 10 remains firmly clamped between the support body 90 and the counter-holder 92 during the movement into the position according to FIGS. 4 and 5.
  • pressure oil is passed through the fluid channel 56 and further through the channels 68 to the underside of the membrane 60, as is customary in isostatic pressing.
  • a special feature of the device shown is that the projection 16, while it is pressed isostatically, is simultaneously pressed against the previously pressed hollow body 10 and connected to it to form a unit without the uniformity of the isostatic pressure being impaired thereby.
  • the space below the membrane 60 is then relieved of pressure oil and placed under vacuum.
  • the plate 52 together with the molded part 58 and the membrane 60 is then pulled down, as a result of which the pressed attachment 16 is exposed in the region of its outer circumference up to two planes parallel to the meridian plane M.
  • support body 90 and counter-holder 92 are moved together out of the cylinder bore 94 of the support body 72 and finally moved apart, so that the cup-shaped hollow body 10 with a pressed handle-shaped extension 16, that is to say a complete handle cup, can be removed.
  • the approach 16 only needs to be deburred; for this purpose it is generally sufficient to pass it between two parallel grinding belts or the like in order to remove the burrs formed between the membrane 60 and the two shaped parts 74 and 74 '.
  • the outer peripheral surface of the extension 16 does not require any post-processing, since it has only been formed by the membrane 60.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Ceramic Products (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Table Devices Or Equipment (AREA)

Claims (9)

  1. Procédé pour la fabrication d'objets creux en céramique (10) avec appendice latéral (16), plus particulièrement de tasses à anse, procédé dans lequel l'appendice se fabrique par compression isostatique d'une matière céramique coulante,
    caractérisé en ce que, dans une étape initiale, un objet creux (10) est fabriqué sans appendice, et en ce que dans une deuxième phase, l'appendice (16) est fabriqué et, en ce faisant, est attaché à l'objet creux (10) sous forme de coupe par l'effort de compression isostatique.
  2. Procédé selon la revendication 1,
    caractérisé en ce que l'objet creux (10) est, lui aussi, formé par compression isostatique dans la première étape.
  3. Procédé selon la revendication 2,
    caractérisé en ce que chaque fois qu'un objet creux (10) est formé par compression dans un premier moule (20), un second moule (50), destiné à la compression d'un appendice (16), est préparé par le remplissage, avec une matière céramique coulante, d'une cavité (76) du second moule (50).
  4. Procédé selon une quelconque des revendications 1 à 3,
    caractérisé en ce que l'objet creux (10) est supporté à son intérieur, pendant que la matière céramique formant l'appendice (10) est soumise à la compression isostatique.
  5. Dispositif pour la mise en oeuvre du procédé selon une quelconque des revendications 1 à 4, ledit dispositif étant muni de parties de moule (58, 74, 74') capables d'être déplacées l'une vers l'autre, et d'une membrane (60), à laquelle peut être appliquée une pression de fluide, destinées à la compression isostatique d'une matière céramique coulante dans une cavité de moule (76) pour un appendice (16) d'un objet creux (10),
    caractérisé en ce que
    - une, au moins, des parties de moule (58, 74, 74') capables d'être déplacées l'une vers l'autre, comporte une face d'appui (80, 80') pour l'objet creux (10) fabriqué séparément,
    - la cavité de moule (76) comporte au moins un orifice (78) situé dans ladite face d'appui (80, 80'), et
    - qu'il est prévu au moins un élément de soutien (90) destiné à mettre l'objet creux (10) en contact avec la face d'appui (80, 80').
  6. Dispositif selon la revendication 5,
    caractérisé en ce que l'élément de soutien (90) est adapté à l'espace interne de l'objet creux (10).
  7. Dispositif selon la revendication 6,
    caractérisé en ce qu'un élément de soutien antagoniste (92) est capable d'être mis en contact avec l'objet creux (10) par l'extérieur.
  8. Dispositif selon une quelconque des revendications 5 à 7,
    caractérisé en ce qu'une partie du moule (58), conçue comme matrice, est revêtue à l'intérieur de la membrane (60) en vue de la compression isostatique de l'appendice (16).
  9. Dispositif selon la revendication 8,
    caractérisé en ce que, pour la compression d'appendices sous forme d'anse (16), deux parties de moule (74, 74'), formant ensemble un poinçon, comportent chacune une portion de la face d'appui (80, 80') de l'objet creux (10), sous forme de coupe, fabriqué séparément, qu'elles sont partagées dans un plan méridien (M) de l'objet creux (10) et de son appendice (16), et qu'elles sont capables d'être déplacées l'une vers l'autre dans une direction normale à ce plan méridien (M).
EP91117307A 1990-10-11 1991-10-10 Procédé et dispositif pour la fabrication d'objets creux en céramique avec appendice latéral, en particulier de tasses avec anse Expired - Lifetime EP0480430B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4032316 1990-10-11
DE4032316A DE4032316C1 (fr) 1990-10-11 1990-10-11

Publications (3)

Publication Number Publication Date
EP0480430A2 EP0480430A2 (fr) 1992-04-15
EP0480430A3 EP0480430A3 (en) 1993-03-24
EP0480430B1 true EP0480430B1 (fr) 1995-04-26

Family

ID=6416103

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91117307A Expired - Lifetime EP0480430B1 (fr) 1990-10-11 1991-10-10 Procédé et dispositif pour la fabrication d'objets creux en céramique avec appendice latéral, en particulier de tasses avec anse

Country Status (4)

Country Link
EP (1) EP0480430B1 (fr)
JP (1) JPH05154825A (fr)
KR (1) KR920007765A (fr)
DE (2) DE4032316C1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4130756C2 (de) * 1991-09-16 1995-03-09 Netzsch Erich Holding Verfahren zum Herstellen keramischer Henkelgefäße sowie Preßform zum Pressen von Gefäßkörpern
DE4311771A1 (de) * 1993-04-08 1994-10-13 Netzsch Erich Holding Werkzeug zum isostatischen Pressen von Henkelgefäßen
DE102013004047A1 (de) 2013-03-08 2014-09-11 Dorst Technologies Gmbh & Co. Kg Pressenanordnung und Verfahren zum Pressen eines Pressteils
DE112014006806A5 (de) 2014-07-15 2017-04-20 Dorst Technologies Gmbh & Co. Kg Pressenanordnung und verfahren zum pressen eines pressteils

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2489798A (en) * 1945-11-07 1949-11-29 Miller Pottery Engineering Co Apparatus for pottery appendaging
DE3304576A1 (de) * 1983-02-10 1984-08-16 Laeis-Werke Ag, 5500 Trier Verfahren und vorrichtung zum herstellen von tiefen kegeligen oder zylindrischen keramischen hohlkoerpern aus pulverfoermiger oder granulatartiger pressmasse durch isostatisches pressen
DE3626365A1 (de) * 1986-08-04 1988-02-11 Dorst Masch & Anlagen Vorrichtung sowie verfahren zur herstellung von mit einem seitlichen fortsatz versehenen tiefenzylindrischen oder kegeligen formkoerpern, insbesondere henkeltassen

Also Published As

Publication number Publication date
KR920007765A (ko) 1992-05-27
DE59105314D1 (de) 1995-06-01
EP0480430A2 (fr) 1992-04-15
EP0480430A3 (en) 1993-03-24
DE4032316C1 (fr) 1992-02-13
JPH05154825A (ja) 1993-06-22

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