EP0637489B1 - Outillage pour le pressage isostatique d'objets creux à parois fortement inclinées en matériau céramique - Google Patents

Outillage pour le pressage isostatique d'objets creux à parois fortement inclinées en matériau céramique Download PDF

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Publication number
EP0637489B1
EP0637489B1 EP94111972A EP94111972A EP0637489B1 EP 0637489 B1 EP0637489 B1 EP 0637489B1 EP 94111972 A EP94111972 A EP 94111972A EP 94111972 A EP94111972 A EP 94111972A EP 0637489 B1 EP0637489 B1 EP 0637489B1
Authority
EP
European Patent Office
Prior art keywords
membrane
female mould
die
compression moulding
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
EP94111972A
Other languages
German (de)
English (en)
Other versions
EP0637489A1 (fr
Inventor
Arnold Reger
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.)
THURINGIA NETZSCH FEINKERAMIK GMBH & CO. KG
Original Assignee
Thuringia Netzsch Feinkeramik & Co KG GmbH
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 Thuringia Netzsch Feinkeramik & Co KG GmbH filed Critical Thuringia Netzsch Feinkeramik & Co KG GmbH
Publication of EP0637489A1 publication Critical patent/EP0637489A1/fr
Application granted granted Critical
Publication of EP0637489B1 publication Critical patent/EP0637489B1/fr
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/001—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a flexible element, e.g. diaphragm, urged by fluid pressure; Isostatic presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
    • B30B15/022—Moulds for compacting material in powder, granular of pasta form
    • B30B15/024—Moulds for compacting material in powder, granular of pasta form using elastic mould parts

Definitions

  • the invention relates to a pressing tool according to the preamble of claim 1.
  • a pressing tool with an elastic membrane required that the to be pressed Separates material from a hydraulic fluid with which closed press tool filled with the material exerted on the side of the membrane facing away from the material becomes.
  • the membrane can be a matrix as its inner lining be assigned to hydraulic pressure on the outside to transfer the hollow body to be pressed.
  • the membrane while the press tool with ceramic material is filled, held against the inner wall of the die and deformed radially inwards during the subsequent pressing will.
  • the deformation path that a membrane takes in isostatic Presses must travel is about the size of the wall thickness (body thickness) of the pressed hollow body.
  • the invention is therefore based on the object of a pressing tool for isostatic pressing of steep-walled hollow bodies ceramic material in such a way that the in it pressed hollow body when demoulding a lower risk of damage are exposed.
  • the task is according to the invention with the features of the claim 1 solved.
  • Press tool provided a mother membrane, which during the hydrostatic pressing fully supported by a die and, as a result, the shape and dimensional accuracy of the pressed hollow body guaranteed immediately after the hydrostatic Presses released from the die so far is that the mother membrane - and thus also the freshly pressed Hollow body - essentially unhindered in the radial direction can expand.
  • acts between the pressed Hollow body and the mother membrane no significant friction, if the hollow body is subsequently removed; of the The hollow body remains undamaged. This applies independently whether the tool part provided with the matrix and the mother membrane arranged as the lower or upper part of the press tool becomes.
  • the press tool shown in Fig. 1 to 4 has a lower Tool part 10 with a plate-shaped male carrier 12, which is designed to be attached to a press table will.
  • a male 14 is fastened on the male carrier 12, which tapers in the shape of a truncated cone.
  • channels 16 By the male support 12 and the male 14 extend channels 16, which connect to a hydraulic pressure medium source leave and open on the surface of the male 14.
  • On the Male carrier 12 is also attached to a clamping ring 18 one that is referred to below as the elastic membrane 20 Membrane at its outer edge 22 close to the male carrier 12 and is clamped on the male 14.
  • the father membrane 20 progressing radially inward from its outer edge 22, an essentially flat foot region 24, a steep one upwardly projecting, frustoconical jacket 26 and an im essential flat middle part 28.
  • the jacket 26 and the central part 28 are close to the Lateral surface or the upper end face of the male 14; around The canals ensure this close concern 16 connect to a vacuum tank or a suction pump.
  • the press tool shown in FIGS. 1 to 4 also belongs an upper tool part 30 with an annular guide body 32, which is a frustoconically widening has smooth inner wall 34 and in its lower region of is penetrated at least one filler channel 36 which is on the outer Edge 22 of the father membrane 20 opens. From above are in the annular guide body 32 stepped bores 38 incorporated.
  • the guide body 32 encloses a die 40, one for Inner wall 34 complementary, ie frustoconical upward widening outer wall 42 and a frustoconical upwardly tapering inner surface 44 and a flat has inner central surface 46.
  • the die 40 is in several axial planes divided into sectors 48 which are radial against each other are movable. 1 to 4 four sectors 48 are provided, each extending over 90 °.
  • the annular guide body 32 and the die 40 are from covered a plate-shaped die carrier 50, which is intended to be attached to a press ram.
  • Die carrier 50 four vertical bolts 52 are attached, the in the lower part of each one of the stepped bores 38 vertically are guided.
  • At the bottom of the die holder 50 are four guide grooves at right angles to each other 54 of dovetail-shaped profile, in each of which a complementarily profiled guide bar 56 is radially displaceable is led.
  • the guide strips 56 are on one of the four sectors 48 of the die 40 attached or in one piece educated.
  • each of the stepped bores 38 has a spring arrangement 58, for example in the form of a plate spring assembly, which makes the annular guide body 32 with respect to the die carrier 50 is biased down.
  • the distance by which the Guide body 32 with respect to the die carrier 50 down is movable, is limited by axially parallel screws 59.
  • Each of the shifters 60 has a two-armed lever 62 which is about a horizontal, to move direction of the associated sector 48 normal axis pivoted on the die carrier 50 and on its lower End with the associated sector 48 and at its upper end articulated with an approximately radially arranged plunger 64 connected is.
  • the plunger 64 is through an energy accumulator 66 preloaded radially inwards, for example a disc spring assembly or can be an air cylinder, and via a joint 68 is supported on the die carrier 50.
  • the die 40 is lined with an elastic membrane, which is referred to below as the mother membrane 70 and one radially outer edge 72, with a steep-walled-conical part an outer lateral surface 74 and an inner lateral surface 76 and finally an essentially flat midfield 78 having. 1 to 3, the two lateral surfaces 74 and 76 at the same angle of about 85 ° against that Inclined horizontally, so they are parallel to each other, and that Mother membrane 70 also has other, except their radial outer edge 72, the same thickness everywhere.
  • an elastic membrane which is referred to below as the mother membrane 70 and one radially outer edge 72, with a steep-walled-conical part an outer lateral surface 74 and an inner lateral surface 76 and finally an essentially flat midfield 78 having. 1 to 3, the two lateral surfaces 74 and 76 at the same angle of about 85 ° against that Inclined horizontally, so they are parallel to each other, and that Mother membrane 70 also has other, except their radial outer edge 72, the same thickness everywhere.
  • the pressing tool shown in FIGS. 1 to 4 works as follows:
  • the pressing tool When the pressing tool is closed, it becomes granular in accordance with FIG. 1 ceramic material 80 in the space between the shot in both membranes 20 and 70, i.e. under influence of compressed air so introduced that this space is completely filled out.
  • the father membrane is 20 over the entire surface of the male 14 and the mother membrane 70 lies, also over the entire surface, on the die 40, which in with respect to the annular guide body 32 their lowest possible Takes position so that their sectors 48 are close together, as shown in the left part of FIG. 4. It is the mother membrane 70 is preferably light in the radial direction compressed.
  • Liquid is then pressurized into the channels 16 initiated so that the father membrane 20 as shown in FIG. 2 in the direction away from the male 14, towards the mother membrane 70, is elastically deformed.
  • the ceramic material becomes 80 pressed into a hollow body 82.
  • the mother membrane 70 follows the four Sectors 48 with their upward and outward facing Movement so that they are in axial and at the same time in radial Direction releases from the pressed hollow body 82. Only when this has happened, the pressing tool is opened, the annular guide body 32 is lifted from the clamping ring 18. The hollow body 82 that becomes accessible in this way becomes finally lifted off the lower tool part 10.
  • the press tool shown in FIGS. 5 to 7 has a lower one Tool part 10, that with that shown in FIGS. 1 to 4 completely matches.
  • the upper tool part 30 differs 5 to 7 of the previously described in essentially in that the guide body 32 and the die 40 a stepped cylindrical inner wall 34 or outer wall 42 have and the die 40 is in one piece.
  • the mother membrane 70 is with its outer edge 72 on the annular guide body 32 clamped, which has a clamping ring 88 for this purpose.
  • the steep-walled area of the mother membrane 70 has one outer lateral surface 74, which is significantly less steep than that inner lateral surface 76.
  • Actuators 86 In the form of a hydraulic piston-cylinder unit, the cylinder of which is fixed to the guide body 32 connected lid 90 of the upper tool part 30 attached is.
  • the press tool shown in FIGS. 5 to 7 works as follows:
  • the die 40 When the ceramic material is shot and pressed 80 the die 40 from the actuators 86 in its lower End position held so that the mother membrane 70 over the entire surface supports, this, especially in the radial direction, can be easily compressed.
  • the actuators 86 After the isostatic pressing, after the reduction of the liquid pressure in the channels 16, and after the father membrane 20 under the action of a internal bias or one applied to channels 16 Vacuum applied to the male 14, the actuators 86 depressurized so that the spring assembly 84 the die 40 pushes upwards according to FIG. 7.
  • the die comes off 40 completely from the mother membrane 70, which by the im Relative to the inner lateral surface 76 lower steepness of the outer lateral surface 74 of the mother membrane 70 is facilitated.
  • the mother membrane 70 was previously slightly compressed, it now expands and consequently releases itself from the pressed one Hollow body 82 so that this when the Press tool is no longer endangered. If the mother membrane 70 in its working position according to Figures 5 and 6 from the die 40 has not been compressed but is essentially free of internal stresses on the die 40, it can be expedient at the moment when the actuators 86 be depressurized, a slight vacuum on the back (In the arrangement shown, this is the top) Mother membrane 70 to create the pressed hollow body Reliably releases 82.
  • Both pressing tools can be in any Location can be arranged in space, especially in Reverse position, i.e. with tool part 10 arranged at the top and tool part 30 arranged below.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Press Drives And Press Lines (AREA)

Claims (10)

  1. Outil de moulage par compression isostatique de corps creux (82) à parois à forte pente en matériau céramique (80) comprenant
    une première partie d'outil (10) qui présente un support de poinçon (12), un poinçon (14) fixé à ce dernier, une membrane mâle (20) et des canaux (16) pour introduire un fluide sous pression entre le poinçon (14) et la membrane mâle (20), et
    une deuxième partie d'outil (30) qui présente au moins deux pièces constitutives mobiles axialement par rapport à la première partie d'outil (10) et l'une par rapport à l'autre, dont une matrice (40),
    caractérisé en ce que
    la matrice (40) est revêtue d'une membrane femelle (70), est entourée d'un corps de guidage annulaire (32) et peut être déplacée dans celui-ci, lorsque l'outil de moulage par compression est fermé, entre une position de compression dans laquelle la matrice (40) supporte la membrane femelle (70) sur toute la surface et une position de décharge dans laquelle elle laisse la membrane femelle (70) s'expanser dans la direction radiale.
  2. Outil de moulage par compression selon la revendication 1,
    caractérisé en ce que
    la membrane femelle (70) est comprimée radialement par la matrice (40) dans la position de compression de celle-ci, et est détendue dans la position de décharge.
  3. Outil de moulage par compression selon la revendication 1 ou 2,
    caractérisé en ce que
    le corps de guidage (32) présente une paroi intérieure (34) s'élargissant en cône en s'éloignant de la première partie d'outil (10) et en ce que la matrice (40) possède une paroi complémentaire (42) à la paroi intérieure (34) et est divisée en plusieurs secteurs radiaux (48) pouvant s'éloigner radialement les uns des autres.
  4. Outil de moulage par compression selon la revendication 3,
    caractérisé en ce que
    les secteurs (48) sont précontraints radialement dans le sens de l'éloignement les uns des autres.
  5. Outil de moulage par compression selon la revendication 3 ou 4,
    caractérisé en ce que
    les secteurs (48) sont guidés pour leur mouvement radial sur un support de matrice (50) qui peut se déplacer avec eux dans la direction axiale par rapport au corps de guidage (32).
  6. Outil de moulage par compression selon la revendication 5,
    caractérisé en ce que
    un système à ressort (58) est disposé comprimé entre le corps de guidage (32) et le support de matrice (50) qui tend à éloigner axialement le support de matrice (50) avec la matrice (40) du poinçon (14).
  7. Outil de moulage par compression selon l'une quelconque des revendications 3 à 6,
    caractérisé en ce que
    la membrane femelle (70) est fixée par son bord extérieur (72) aux secteurs (48) de la matrice (40).
  8. Outil de moulage par compression selon la revendication 1 ou 2,
    caractérisé en ce que
    la membrane femelle (70) est tendue par son bord extérieur (72) sur le corps de guidage (32) et en ce que la matrice (40) peut s'éloigner axialement d'un seul bloc de la membrane femelle (70).
  9. Outil de moulage par compression selon la revendication 8,
    caractérisé en ce que
    la matrice (40) est précontrainte par un système à ressort (84) par rapport au corps de guidage (32) dans le sens d'un mouvement d'éloignement axial de la membrane femelle (70), et peut coulisser dans la direction opposée au moyen d'un organe de positionnement (86).
  10. Outil de moulage par compression selon la revendication 8 ou 9,
    caractérisé en ce que
    la matrice (40) et la membrane femelle (70) présentent des surfaces d'enveloppe intérieure respectivement extérieure (44, 74) de pente plus faible que celle de la surface d'enveloppe extérieure du corps creux pressé (82) et de la surface d'enveloppe intérieure complémentaire (76) de la membrane femelle (70).
EP94111972A 1993-08-03 1994-08-01 Outillage pour le pressage isostatique d'objets creux à parois fortement inclinées en matériau céramique Expired - Lifetime EP0637489B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4326033 1993-08-03
DE4326033A DE4326033C1 (de) 1993-08-03 1993-08-03 Preßwerkzeug zum isostatischen Pressen steilwandiger Hohlkörper aus keramischem Material

Publications (2)

Publication Number Publication Date
EP0637489A1 EP0637489A1 (fr) 1995-02-08
EP0637489B1 true EP0637489B1 (fr) 1998-02-25

Family

ID=6494361

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94111972A Expired - Lifetime EP0637489B1 (fr) 1993-08-03 1994-08-01 Outillage pour le pressage isostatique d'objets creux à parois fortement inclinées en matériau céramique

Country Status (3)

Country Link
EP (1) EP0637489B1 (fr)
CN (1) CN1105924A (fr)
DE (2) DE4326033C1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009048882B4 (de) * 2009-10-09 2012-08-02 Sama Maschinenbau Gmbh Vorrichtung und Verfahren zur Herstellung hintergriffiger Becher

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011103745B4 (de) * 2011-05-31 2020-06-04 Sama Maschinenbau Gmbh Verfahren und Preßwerkzeug zum isostatischen Pressen
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
DE102016015637A1 (de) 2016-12-29 2018-07-05 Günter Söthje Vorrichtung und Verfahren zur Herstellung von Behältern mit mindestens einen Henkel
US10773291B2 (en) * 2017-05-24 2020-09-15 Polyurethane Products Universal radius forming system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1152063A (en) * 1965-06-21 1969-05-14 American Radiator & Standard Method and apparatus for Isostatically Pressing Ceramic Ware
IT1054058B (it) * 1976-01-13 1981-11-10 Bettonica L Pressa idraulica particolarmente per la formatura e la pressatura di oggetti ceramici cavi tronco cilindrici o tronco conici o simili
DE3145199A1 (de) * 1981-11-13 1983-06-01 Dorst - Maschinen- und Anlagen-Bau Otto Dorst u. Dipl.-Ing. Walter Schlegel GmbH & Co, 8113 Kochel Presswerkzeug zum herstellen keramischer formlinge, insbesondere teller, aus pulverfoermiger masse
DE3332277A1 (de) * 1983-03-30 1984-10-04 Dorst - Maschinen- und Anlagen-Bau Otto Dorst u. Dipl. Ing. Walter Schlegel GmbH & Co, 8113 Kochel Presse zum herstellen von tellern od. dgl.
DE3524779A1 (de) * 1985-07-11 1987-01-15 Laeis Gmbh Presse zum herstellen von tellern oder dergleichen
EP0221224A1 (fr) * 1985-10-08 1987-05-13 Enzo Mantegani Presse pour l'obtention d'objets exigeant pour leur fabrication industrielle, une étape de préformage avec faible dépense d'effort, et une pression finale élevée

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009048882B4 (de) * 2009-10-09 2012-08-02 Sama Maschinenbau Gmbh Vorrichtung und Verfahren zur Herstellung hintergriffiger Becher

Also Published As

Publication number Publication date
CN1105924A (zh) 1995-08-02
EP0637489A1 (fr) 1995-02-08
DE4326033C1 (de) 1994-11-03
DE59405292D1 (de) 1998-04-02

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