EP0255719B1 - Dispositif et procédé pour fabriquer des pièces moulées creuses de forme conique ou cylindrique, en particulier tasses avec une anse - Google Patents

Dispositif et procédé pour fabriquer des pièces moulées creuses de forme conique ou cylindrique, en particulier tasses avec une anse Download PDF

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Publication number
EP0255719B1
EP0255719B1 EP87111262A EP87111262A EP0255719B1 EP 0255719 B1 EP0255719 B1 EP 0255719B1 EP 87111262 A EP87111262 A EP 87111262A EP 87111262 A EP87111262 A EP 87111262A EP 0255719 B1 EP0255719 B1 EP 0255719B1
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EP
European Patent Office
Prior art keywords
mould
pressing
filling
membrane
pressing mould
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
EP87111262A
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German (de)
English (en)
Other versions
EP0255719A1 (fr
Inventor
Hilmar Bruno Suffa
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
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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
Publication of EP0255719A1 publication Critical patent/EP0255719A1/fr
Application granted granted Critical
Publication of EP0255719B1 publication Critical patent/EP0255719B1/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
    • 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 device according to the preamble of patent claim 1 and a method according to the preamble of patent claim 9.
  • the pressing tool used for this has a stamp-like inner pressing mold which carries a membrane for isostatic pressing.
  • the upper press mold is formed from two press halves that can be moved laterally.
  • a core that can also be used in one of the press halves and also carries a membrane is used. It is therefore a very complex pressing tool, which has the main disadvantage that the upper press mold for forming the outside of the cup is divided so that a seam remains on the cup after the molding process. Since the mold cavity is also delimited by a stamp which closes the filling channel, there is also a seam at the edge of the base area of the cup.
  • the object of the invention is to enable the production of handle cups in a single operation in a simple manner and with reproducible wall thicknesses and without the risk of cracking and damage.
  • the invention is characterized in that the outer mold is undivided, so that the formation of a seam and the associated reworking are eliminated.
  • a one-piece membrane is used both for shaping the extension and for shaping the shaped body simplifies manufacture. Since the outer mold, in the filling position, defines a filling or evacuation gap along its outer circumference with a filling ring, filling takes place under vacuum, so that metering devices can be dispensed with. Since the outer mold is moved in the axial direction of the molded body against the inner mold to close the mold cavity, the ceramic material located in the mold cavity is statically pre-pressed in the direction of the punch movement.
  • This static pre-pressing is essential, because it shortens the path that the membrane takes when the iso, especially in the area of the floor and the curve in the transition from the floor to the molded body walls must make static presses. This is very important because with wide diaphragm paths, in particular due to the complicated shape in the transition area from the floor to the molded body walls, otherwise uneven wall thicknesses would result due to the existing curves. In the rounded areas, there would be a thickening due to a different resistance to the straight areas, and in particular in the more flat areas, the thickness of the shaped body would be weakened. In addition, tensions could otherwise arise in the membrane, which would lead to damage to the molded article during removal from the mold.
  • the invention thus allows the production of moldings with precisely controlled wall thicknesses and in a reproducible manner. The risk of damage is largely excluded even during demolding.
  • a supporting wedge is expediently used, the shaped surface of which is adapted to the upper edge of the handle.
  • the support wedge then delimits the actual handle area with the opposite membrane.
  • the support wedge is mounted in the filling ring.
  • the support wedge From a deformation-resistant and thus rigid material, in particular steel. If a material with an elastic component or a plastically deformable material is used for the support wedge, the support wedge would be compressed during the isostatic pressing, which could lead to damage to the extension in the region of the support wedge during removal from the mold.
  • the membrane in the extension area so that the membrane surfaces forming the side walls of the extension taper from the inside to the outside in the manner of a cone.
  • the shaped extension has essentially straight side surfaces, so that the membrane can be removed without damaging the extension.
  • the inner punch at its lower end with a circumferential bevel which serves as a stop surface for the membrane pressed in during isostatic pressing. Because of this stop, the membrane moves together evenly in the cylindrical or conical region of the molded body during isostatic pressing and thus achieves uniform wall thicknesses of the molded body over the circumference.
  • the mold cavity is first filled by vacuum filling, so that a metering device can be dispensed with, and the ceramic material distributed in the mold cavity is subjected to a static compression molding when the mold is closed, which means that the path for the membrane during isostatic is carried out Pressing in the bottom area of the mold cavity is reduced. After this static pressing, the isostatic pressing is carried out by applying pressure medium to the back of the membrane.
  • the press tool shown in Fig. 1 essentially comprises an upper outer die 1 and a lower inner die 3 formed by an inner die 2, which delimit between them a mold cavity designated 4 for producing a molded body, namely a cup provided with a handle.
  • the outer mold 1 is contoured according to the outside of the cup to be manufactured, including the handle.
  • the shape of the inner stamp 2 corresponds to the inner shape of the cup.
  • the inner mold 3 further comprises a support wedge 5, particularly in the case of the manufacture of a cup, in which the handle is arranged offset downwards relative to the upper edge of the cup.
  • the supporting wedge 5 is received in a recess 6 of a filling ring, generally designated 7.
  • the filler ring 7 itself has at least one feed channel 8 for the ceramic mass and at least one evacuation channel 9.
  • a feed channel 8 is provided for the evacuation.
  • the filler ring 7 has two evacuation channels 9, as shown in FIG. 2.
  • the outer die 1 is attached in a manner shown in the drawing, but not explained here for reasons of clarity, to a die 10, which is only indicated schematically, with which the die 1 is relative to the inner die 2 in the direction of the axis of the die and thus of the hollow body is movable.
  • the outer mold carries a membrane 11 of known type on the molding surface, which is pinched and fixed at 13 on its outer edge 12.
  • the membrane used for isostatic pressing is connected on its underside via channels 14 to a suitable pressure medium source, not shown, so that the membrane can be pressurized from the underside for the isostatic pressing process.
  • the pressure medium channels 14 are provided both in the cylindrical region of the press mold and on the bottom of the press mold and in the handle region.
  • the inner stamp 2 is fastened in the illustrated embodiment according to FIG. 1 on a stamp plate 15 by means of a screw connection 16, so that the inner stamp can be quickly and easily exchanged for another inner stamp if required.
  • the stamp plate 15 itself sits on a support plate 17 fixed with the press.
  • lifting devices designated 18 are accommodated in the form of pressure medium pistons, by means of which the filling ring 7 can be raised relative to the support plate 17. Only one of the lifting devices 18 is shown in FIG. 1.
  • FIG. 1 shows the pressing tool in the filling position, in which the filling ring 7 is raised relative to the support plate 17 as a result of the lifting devices 18 and together with the outer pressing mold 1 relative to the inner punch 2, a narrow filling gap designated 19 and one from FIG. 1 not shown, but limited in FIG. 2, evacuation gap 20.
  • the filling gap 19 extends over the circle segment designated F, whereas the evacuation gap extends essentially over the remainder of the circumference, as identified by E.
  • Fig. 1 shows the pressing tool after closing the mold, but before the isostatic pressing.
  • the membrane for the production of cup with handle is integrally formed. It is largely rotationally symmetrical to form the cup and is formed only in the region of the handle designated by 21 with a radial extension for shaping the handle.
  • the radial extension 21 is expediently conical in a section perpendicular to the axis A-A of the shape, the cone widening from radially outside to radially inside.
  • the support wedge 5 which corresponds to the width of the handle in the upper region, is adapted to the shape of the upper edge 22 of the handle and, together with the inner punch 2 and the membrane 11, delimits the mold cavity.
  • the inner die 2 is formed all around in connection with the upper edge 23 of the mold cavity with a circumferential bevel 24, which serves as a run-up surface for the upper die 1.
  • the membrane 11 is formed at 25 with a corresponding circumferential inclined surface.
  • the operation of the press tool is as follows: for the purpose of filling the mold cavity 4, the upper press mold 1 is in the position relative to the inner punch 2 as shown in the left-hand illustration in FIG. 1.
  • the filler ring 7 is also raised as a result of the lifting devices 18, so that a filling gap and an evacuation gap are formed in the manner described above. If negative pressure is now applied to the channels 9, ceramic mass is filled into the mold cavity 4 from the feed channel 8.
  • the stamp 10 is lowered so that the filling ring 7 is also moved downward until it strikes against the upper surface 26 of the support plate 17, which acts as a stop surface. This position is shown in the right half in FIG. 1.
  • the ceramic mass Due to this movement of the stamp 10 and the associated downward movement of the upper outer die 1, the ceramic mass has been statically pressed in the mold cavity in the direction of the stamp movement S, with the membrane 11 still during this process pressure medium has not been applied to its underside.
  • the isostatic pressing takes place, for which purpose pressure medium is supplied via the channels 14 to the back of the membrane 11 in the closed position of the press mold, as shown in FIG. 1 on the right.
  • the pressure medium is discharged again, so that the membrane 11 relaxes.
  • the molded cup can now be removed or ejected.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)

Claims (10)

1. Dispositif pour la fabrication de pièces moulées creuses cylindriques ou coniques munies d'un prolongement latéral, particulièrement, de tasses avec une anse, à partir d'une pâte céramique en forme de poudre ou de granulés, par compression isostatique, comportant au moins deux moules (1, 3) délimitant la cavité de moulage (4) comprenant au moins un moule extérieur (1) formant la face extérieure de la pièce moulée creuse et du prolongement et un moule (3) pénétrant dans ce moule extérieur, formant la face intérieure de la pièce moulée creuse, l'un d'eux étant muni d'au moins une membrane (11) en une seule pièce et s'adaptant à la pièce moulée, pouvant être actionnée par un agent de pression, caractérisé par le fait qu'il est prévu un moule extérieur (1) sans séparation, dans lequel est logée une membrane (11) adaptée à la face extérieure du prolongement et du corps creux, que le moule extérieur (1), en position de remplissage, délimite sur sa périphérie, avec un anneau de remplissage (7), une fente de remplissage et d'évacuation (19), qu'il est mobile, dans le sens axial du moule, pour se rapprocher du moule intérieur (2) en vue de la fermeture de la cavité de moulage (4) avec compression statique de la pâte céramique se trouvant dans la cavité de moulage, et que le moule intérieur (2) comprend une clavette d'appui (5) dont la forme superficielle (22) est adaptée à celle du bord du prolongement.
2. Dispositif selon la revendication 1, caractérisé par le fait que la clavette d'appui (5) est montée dans un évidement (6) de l'anneau de remplissage (7).
3. Dispositif selon l'une des revendications précédentes, caractérisé par le fait que l'anneau de remplissage (7) comporte une plaque de poinçon (15) portant le poinçon interne (2) et est mobile par rapport à la plaque de poinçon (15) dans le sens axial (A-A) de la cavité de moulage (4) en même temps que le mouvement du poinçon du moule extérieur (1), jusqu'en une butée (26) solidaire de la plaque poinçon (15).
4. Dispositif selon l'une des revendications précédentes, caractérisé par le fait que la clavette d'appui (5) est faite d'un matériau indéformable, plus particulièrement, d'acier.
5. Dispositif selon l'une des revendications précédentes, caractérisé par le fait que la largeur de la clavette d'appui (5) correspond à la largeur du bord supérieur du prolongement préformé.
6. Dispositif selon l'une des revendications précédentes, caractérisé par le fait que la section de la membrane (11) a une conformation conique s'élargissant de l'extérieur vers l'intérieur, perpendiculairement à l'axe du moule (A-A) dans la zone du prolongement (21).
7. Dispositif selon l'une des revendications précédentes, caractérisé par le fait que le poinçon intérieur (2) est conformé à son rebord inférieur avec une oblicité d'attaque périphérique (24) pour une surface oblique (25) correspondante de la membrane (11).
8. Procédé pour la fabrication de pièces moulées creuses cylindriques ou coniques, munies d'un prolongement latéral, en particulier, de tasses à anse, à partir d'une pâte céramique, sous forme de poudre ou de granulés par compression isostatique, avec au moins deux moules délimitant la cavité de moulage, dont l'un est pourvu d'au moins une membrane actionnable par un agent de pression, le remplissage de la cavité de moulage se faisant sous vide au moyen d'un anneau de remplissage, caractérisé par le fait que la pâte de céramique répartie dans la cavité de moulage est pré-comprimée statiquement au moyen de l'un des moules par un déplacement du poinçon dans la direction de fermeture du moule et que l'ébauche est ensuite comprimée par voie isostatique par utilisation d'une membrane pour la pièce creuse et le prolongement.
9. Procédé selon la revendication 8, caractérisé par le fait que, en vue du remplissage du moule, le poinçon de compression extérieur et l'anneau de remplissage sont amenés à une position plus haute que la position de fermeture du moule, position dans laquelle le poinçon extérieur et l'anneau de remplissage délimitent avec le poinçon intérieur, une fente de remplissage et d'évacuation le long de la périphérie maximale de la cavité de moulage.
10. Procédé selon la revendication 8 ou la ren- vendication 9, caractérisé par le fait que l'anneau de remplissage est déplaçable avec le moule extérieur, par suite du mouvement du poinçon, contre une butée fixe d'une plaque d'appui portant le poinçon intérieur, en vue de fermer le moule.
EP87111262A 1986-08-04 1987-08-04 Dispositif et procédé pour fabriquer des pièces moulées creuses de forme conique ou cylindrique, en particulier tasses avec une anse Expired - Lifetime EP0255719B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863626365 DE3626365A1 (de) 1986-08-04 1986-08-04 Vorrichtung sowie verfahren zur herstellung von mit einem seitlichen fortsatz versehenen tiefenzylindrischen oder kegeligen formkoerpern, insbesondere henkeltassen
DE3626365 1986-08-04

Publications (2)

Publication Number Publication Date
EP0255719A1 EP0255719A1 (fr) 1988-02-10
EP0255719B1 true EP0255719B1 (fr) 1990-10-24

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP87111262A Expired - Lifetime EP0255719B1 (fr) 1986-08-04 1987-08-04 Dispositif et procédé pour fabriquer des pièces moulées creuses de forme conique ou cylindrique, en particulier tasses avec une anse

Country Status (2)

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EP (1) EP0255719B1 (fr)
DE (2) DE3626365A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4032316C1 (fr) * 1990-10-11 1992-02-13 Erich Netzsch Gmbh & Co Holding Kg, 8672 Selb, De
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
DE4402251C1 (de) * 1994-01-26 1995-02-23 Netzsch Erich Holding Preßwerkzeug zum isostatischen Pressen steilwandiger topfförmiger Gegenstände aus keramischem Granulat
DE102013004047A1 (de) * 2013-03-08 2014-09-11 Dorst Technologies Gmbh & Co. Kg Pressenanordnung und Verfahren zum Pressen eines Pressteils
WO2016008462A1 (fr) * 2014-07-15 2016-01-21 Dorst Technologies Gmbh & Co. Kg Dispositif de presse et procédé pour presser une pièce pressée
CN113459574B (zh) * 2021-06-30 2022-09-13 湖南嘉恒制药有限公司 一种用于粉末药片的压合取出机构

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2637231C3 (de) * 1976-08-18 1982-03-04 Dorst-Keramikmaschinen-Bau Otto Dorst U. Dipl.-Ing. Walter Schlegel, 8113 Kochel Vorrichtung zum Pressen keramischen Pulvers zu topfartigen Formkörpern
US4087221A (en) * 1977-01-31 1978-05-02 Remington Arms Company, Inc. Apparatus for molding powder metal parts
DE2935157C2 (de) * 1979-08-31 1987-02-19 Laeis GmbH, 5500 Trier Presse für dünnwandige, großflächige keramische Formteile, wie Teller usw.
DE2948643A1 (de) * 1979-12-04 1981-06-11 Laeis-Werke Ag, 5500 Trier Pressform, insbesondere fuer keramische formteile
DE3024935C2 (de) * 1980-07-01 1986-07-24 Dorst-Keramikmaschinen-Bau Otto Dorst u. Dipl. Ing. Walter Schlegel, 8113 Kochel Preßwerkzeug zur Herstellung von schalenförmigen Preßkörpern, wie Platten, Tellern, Bechern, Schüsseln o.dgl., aus pulverförmigem, keramischem Material

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Publication number Publication date
DE3765717D1 (de) 1990-11-29
EP0255719A1 (fr) 1988-02-10
DE3626365A1 (de) 1988-02-11

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