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EP0780204B1 - Procédé et dispositif pour la fabrication de tuyaux à emboítement moulés - Google Patents

Procédé et dispositif pour la fabrication de tuyaux à emboítement moulés Download PDF

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Publication number
EP0780204B1
EP0780204B1 EP96120533A EP96120533A EP0780204B1 EP 0780204 B1 EP0780204 B1 EP 0780204B1 EP 96120533 A EP96120533 A EP 96120533A EP 96120533 A EP96120533 A EP 96120533A EP 0780204 B1 EP0780204 B1 EP 0780204B1
Authority
EP
European Patent Office
Prior art keywords
molding
ring
inner core
bell
set forth
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
EP96120533A
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German (de)
English (en)
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EP0780204A1 (fr
Inventor
Klaus Dipl.-Ing. Strobel
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Individual
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Individual
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Publication of EP0780204A1 publication Critical patent/EP0780204A1/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
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B21/00—Methods or machines specially adapted for the production of tubular articles
    • B28B21/02—Methods or machines specially adapted for the production of tubular articles by casting into moulds
    • B28B21/10—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means
    • B28B21/18—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means using expansible or retractable mould or core 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
    • B28B21/00—Methods or machines specially adapted for the production of tubular articles
    • B28B21/02—Methods or machines specially adapted for the production of tubular articles by casting into moulds
    • B28B21/10—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means
    • B28B21/36—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means applying fluid pressure or vacuum to the material

Definitions

  • the invention relates to a method and an apparatus for manufacturing of socket pipe moldings from a ceramic molding compound by isostatic pressing, in which the mold to be pressed is within a hollow cylindrical pressure pot between an in Extendable axial core and one concentric to it arranged rubber-elastic membrane formed mold cavity is introduced, the rubber-elastic membrane is clamped on the face and one of the pressure pots a pressure chamber that can be acted upon by a hydraulic pressure source limited and the inner core with a the sleeve area of the socket pipe with two concentric, but in the axial direction provided spaced end faces forming ring is. Furthermore, the invention relates to a device for performing of such a process,
  • a method and a device of this type are from DE-AS 14 59 330 known.
  • the device described in this document is used for isostatic pressing of socket pipe fittings.
  • the well-known Device has a hollow cylindrical tubular body, one Mold cavity, a pressurizable rubber-elastic membrane and a steel insert at the end to form the socket area on.
  • the socket area of the molding is defined by an annular Steel insert generated. In the socket area, especially on the shoulder of the socket area can be due to the large wall thickness differences microcracks occur during isostatic pressing.
  • DE 28 25 611 C2 describes a device for isostatic pressing known from tongue and groove tubes.
  • This device has an inner core with a bottom ring on top and a pressurized one Membrane.
  • ring-shaped inserts made of rubber or plastic are provided.
  • This ring-shaped inserts have the task of being elastic Diaphragm outgoing pressure into a wedge of the mold cavity transferred, which is not directly exposed to the elastic membrane is. This has the consequence that the molding compound, which is in the Inner core adjacent recess to form a spring, is sufficiently well compacted by the pressing process.
  • the object of the invention is based on this prior art to provide a method and an apparatus for no cracks in the socket area of the isostatically pressed molding occur.
  • a method for the production of Socket pipe moldings proposed according to claim 1.
  • the elastic plastic which is advantageous is a high-molecular plastic, works despite its elasticity shaping in isostatic pressing. Still sees that inventive method a venting of the mold cavity during of the pressing process.
  • inventive method eliminates the risk of cracking greatly reduced in the socket area of the molding.
  • the method is particularly suitable for the production of large format Socket pipe moldings from about 100 to 1,500 mm in diameter.
  • the invention relates to a device for producing Socket pipe moldings.
  • the device according to the invention is thereby characterized in that at least the sleeve area of the sleeve pipe forming end face of the end portion of the mold ring a surface has an elastic plastic and the end region of the form ring with the inner core delimits an annular gap, which depends at least one of the pressing pressure provided on the inner core, releases vent hole communicating with the mold cavity or closes.
  • the end region of the Formrings on a coating of an elastic plastic By not only the end faces of the molded ring, but the entire one End area a coating made of an elastic plastic has, there is a risk of cracking in the socket pipe moldings further decreased.
  • the end area of the molded ring with a sleeve made of an elastic plastic in another advantageous embodiment of the invention, the end area of the molded ring with a sleeve made of an elastic plastic.
  • the End region of the form ring in this embodiment according to the invention by simply replacing the sleeve made of elastic plastic other shapes can be adapted. Also in case of possible wear the entire molded ring cannot be replaced, it is enough to just use a new sleeve.
  • the rubber elastic Membrane on an area adjacent to the mold ring.
  • the inner core is tubular formed and has at least one with the mold cavity communicating vent hole.
  • Figure 1 shows a simplified representation of the device according to the invention for the production of a socket pipe molding.
  • the device comprises a substantially hollow cylindrical pressure pot 11, the lower region 3 is widened and vertical bores 4 has, for example, to fix the device on a Serve under table (not shown).
  • An inner core 13 is provided coaxially, which can be pulled out in the axial direction is.
  • the inner core 13 together with a lower stamp 5, on which it rests, lowerable.
  • the lower punch 5 can be designed, for example, as a nut be in which the inner core 13 with one in its lower Area provided external thread can be screwed.
  • an upper punch 15 is provided, which can be lowered onto the pressure pot 11.
  • a rubber-elastic membrane 14 arranged by means of membrane holders 7, 8 is held. Together with the inner core 13 the rubber-elastic membrane 14 includes a mold cavity 12, in the lower region of which a molding ring 20 is introduced, which over an interposed spacer 9 rests on the lower punch 5.
  • the shaped ring 20 has an end region with a reduced diameter 21, which lies in the illustration of Figure 1 above. This end area 21 is used to form two concentric, but in the axial direction spaced end faces 22a, 22b (see also Figures 2 to 4).
  • the rubber-elastic membrane 14 borders with the pressure pot 11 Pressure chamber 16 from.
  • this pressure chamber 16 there is a cylindrical one Insert 10 is provided, on which the rubber-elastic membrane 14th abuts and which has a plurality of radial bores 18.
  • Means A hydraulic pressure source (not shown) becomes the pressure chamber 16 pressurized.
  • radial bores 19 are provided in the pressure pot 11, wherein the lower radial bore in the drawing of Figure 1 19a serves the oil supply, while the upper radial bore 19b Oil drain is used.
  • the pressure on the rubber-elastic membrane 14 is directed towards of the inner core 13 is deflected and thereby into the mold cavity 12 filled molding compound compressed and compressed so that a Socket pipe molding 40 is formed.
  • FIG. 1 and 2 shows the device according to the invention after isostatic pressing, i.e. the rubber-elastic membrane 14 is in its non-pressurized idle state and the socket pipe molding 40 located in the mold cavity 12 finished pressed.
  • the socket pipe molding 40 becomes the hollow cylindrical Pressure pot 11 removed by the inner core 13 together with the Lower punch 5 and the ring 20 resting thereon lowered becomes.
  • Figure 2 shows an enlarged detail according to the dash-dotted section shown in Figure 1.
  • the elastic plastic for the end faces 22 of the molded ring 20 it is in particular a high-molecular plastic, for example polyamide 6.6.
  • the upper end region of the molding ring 20 is on the inner diameter of the molded ring 20 is provided with a stepped shoulder 23 which abuts an associated edge of the inner core 13.
  • Paragraph 23 has a horizontal contact surface that is offset along the circumference arranged radial grooves 23a is provided.
  • the inner core 13 On par with the Radial grooves 23a, the inner core 13 has a radial vent hole 17 on.
  • the gap width of the annular gap 42 depends on the pressure prevailing in the mold cavity 12.
  • the Annular gap 42 released or closed, so that the inner core side Pressure on the blank 40 can be compensated.
  • FIG. 3 shows a representation corresponding to FIG. 2 as a further one Embodiment of the invention a form ring 20, the im Diameter reduced end region 21 a coating 25 made of elastic Has plastic.
  • the entire is the sleeve area of the socket pipe molding 40 forming end region 21 made of elastic Plastic, so that the risk of cracking is further reduced becomes.
  • the elastic coating is also used in this variant 25 in the area of the upper end face 22a with a lip-shaped Approach 25a formed.
  • a third exemplary embodiment of a shaped ring 20 according to the invention is correspondingly shown in Figure 4, in this embodiment the end region 21 of the molded ring 20 with a sleeve 26 an elastic plastic is formed.
  • the sleeve 26 can simply be placed on the end region 21 of the shaped ring 20 and advantageously if necessary, for example when the Sleeve 26 or other shape in the socket area, exchanged become.
  • Figure 5 shows a sectional view through a fourth embodiment a shaped ring 20 which according to the invention has a diameter reduced end portion 21 to form two concentric, however has axially spaced end faces 22a, 22b, wherein the entire form ring 20 consists of an elastic plastic.
  • the radial grooves 23a are axial grooves 43 assigned, which run on the inner diameter of the mold ring 20.
  • the axial grooves 43 go into radial grooves at the lower end of the form ring 20 44 over. In this exemplary embodiment, therefore, the ventilation takes place of the mold cavity 12 via the between the mold ring 20 and Inner core 13 present annular gap, the radial grooves 23a, the axial grooves 43 and the radial grooves 44.
  • FIG. 6 shows a top view of the form ring 20 according to FIG. 5 the section line VI-VI. To simplify the illustration, FIG only one half of the form ring 20 is shown.
  • FIG. 6 shows a top view of the form ring 20 according to FIG. 5 the section line VI-VI. To simplify the illustration, FIG only one half of the form ring 20 is shown.
  • the ventilation grooves 27 are regularly along the Distributed axially extending flats of the ring circumferential surface.
  • the outer surface of the form ring 20 is dashed at the locations of the flats shown (see also Figure 5).
  • Through the axially extending ventilation grooves 27 is the mold cavity 12 after isostatic pressing ventable.
  • the mold cavity 12 is vented during the pressing process.
  • the venting takes place via the annular gap 42, which is in the region of the Paragraph 23 of the end portion 21 of the mold ring 20 and the inner core 13 is limited. Via the annular gap 42 takes place depending on Pressing pressure to vent the mold cavity 12.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Claims (10)

  1. Procédé pour 1a fabrication de tubes à emboítement moulés à partir d'une masse de moulage en céramique par pressage isostatique, dans lequel la masse de moulage à presser est introduite dans une cavité de moulage (12) formée à l'intérieur d'un pot de compression cylindrique creux (11) entre un noyau intérieur (13) susceptible d'être extrait en direction axiale et une membrane (14) présentant l'élasticité du caoutchouc et agencée de manière concentrique au pot de compression, dans lequel la membrane (14) présentant l'élasticité du caoutchouc est serrée du côté frontal et délimite avec le pot de compression (11) une chambre de pression (16) susceptible d'être alimentée depuis une source de pression hydraulique, et le noyau intérieur (13) est pourvu d'une bague de moulage (20) qui définit la région d'emboítement (41) du tube à emboítement (40) au moyen de deux surfaces frontales (22a, 22b) concentriques mais écartées en direction axiale, caractérisé en ce que la masse de moulage est pressée dans la région d'emboítement (41) de la partie moulée contre une surface (24) en matière plastique élastique, prévue au moins au niveau de la surface frontale supérieure (22a) de la bague de moulage (20), et en ce que la région terminale (21) de la bague de moulage (20) délimite avec le noyau intérieur (13) une fente annulaire (42) qui libère et qui obture, pendant l'opération de pressage et en fonction de la pression qui règne dans la cavité de moulage (12), au moins un perçage de mise à l'air (13) qui communique avec la cavité de moulage (12).
  2. Procédé selon la revendication 1, caractérisé en ce que la surface frontale élastique (22a) de la bague de moulage (20) soutient de manière élastique la zone d'emboítement (41) du tube à emboítement (40) pendant l'opération de pressage.
  3. Appareil pour la production de tubes à emboítement moulés, en particulier pour la mise en oeuvre du procédé selon l'une ou l'autre des revendications 1 et 2, dans lequel à l'intérieur d'un pot de compression cylindrique creux (11) est prévue une cavité de moulage (12) pour la masse de moulage à presser, entre un noyau intérieur (13) susceptible d'être extrait en direction axiale et une membrane (14) présentant l'élasticité du caoutchouc et agencée de manière concentrique à celui-ci, ladite membrane étant serrée du côté frontal et délimitant avec le pot de compression (11) une chambre de pression (16) susceptible d'être alimentée depuis une source de pression hydraulique, dans lequel le noyau intérieur (13) est pourvu d'une bague de moulage (20) qui forme la zone d'emboítement (41) du tube à emboítement (40) avec deux surfaces frontales (22a, 22b) concentriques mais écartées en direction axiale, ladite bague comportant une zone terminale (21) à diamètre réduit, caractérisé en en ce qu'au moins la surface frontale (22a), formant la région d'emboítement (41) du tube à emboítement (40), de la région terminale (21) de la bague de moulage (20) présente une surface (24) en matière plastique élastique, et la région terminale (21) de la bague de moulage (20) délimite avec le noyau intérieur (13) une fente annulaire (42) qui libère ou qui obture en fonction de la pression au moins un perçage de mise à l'air (17) prévu dans le noyau intérieur (30) et communiquant avec la cavité de moulage (12).
  4. Appareil selon la revendication 3, caractérisé en ce que la région terminale (21) de la bague de moulage (20) comporte un revêtement (25) en matière plastique élastique.
  5. Appareil selon l'une ou l'autre des revendications 3 et 4, caractérisé en ce que la bague de moulage (20) totale est réalisée en une matière plastique élastique.
  6. Appareil selon l'une des revendications 3 à 5, caractérisé en ce que la région terminale (21) de la bague de moulage (20) est réalisée avec une douille (26) de matière plastique élastique.
  7. Appareil selon l'une des revendications 3 à 6, caractérisé en ce que la membrane (14) présentant l'élasticité du caoutchouc comporte une région appliquée contre la bague de moulage (20).
  8. Appareil selon l'une des revendications 3 à 7, caractérisé en ce que le noyau intérieur (13) est réalisé sous forme tubulaire.
  9. Appareil selon l'une des revendications 3 à 8, caractérisé en ce que la bague de moulage (20) est pourvue de gorges de mise à l'air (43) qui s'étendent en direction axiale.
  10. Appareil selon l'une des revendications 3 à 9, caractérisé en ce que la matière plastique élastique est une matière plastique à poids moléculaire élevé, en particulier du polyamide 6.6.
EP96120533A 1995-12-20 1996-12-19 Procédé et dispositif pour la fabrication de tuyaux à emboítement moulés Expired - Lifetime EP0780204B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19547775A DE19547775C1 (de) 1995-12-20 1995-12-20 Vorrichtung zur Herstellung von Muffenrohr-Formlingen und unter Verwendung der Vorrichtung hergestellter Muffenrohr-Formling
DE19547775 1995-12-20

Publications (2)

Publication Number Publication Date
EP0780204A1 EP0780204A1 (fr) 1997-06-25
EP0780204B1 true EP0780204B1 (fr) 2001-09-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96120533A Expired - Lifetime EP0780204B1 (fr) 1995-12-20 1996-12-19 Procédé et dispositif pour la fabrication de tuyaux à emboítement moulés

Country Status (4)

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US (1) US5779966A (fr)
EP (1) EP0780204B1 (fr)
AT (1) ATE205128T1 (fr)
DE (2) DE19547775C1 (fr)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2865079A (en) * 1955-04-13 1958-12-23 Marchioli Giorgio Process for shaping in a mold a moldable material in the form of hollow bodies of non-uniform cross section, by employing an inflatable inner bag and yielding elements placed on said inner bag
DE1014475B (de) * 1955-05-11 1957-08-22 Georgio Machioli Verfahren und Vorrichtung zum Herstellen von Hohlkoerpern
GB977373A (en) * 1962-06-14 1964-12-09 Pacific Clay Products Method and apparatus for manufacturing a pipe
US3193900A (en) * 1963-09-30 1965-07-13 Pacific Clay Products Apparatus for manufacturing clay pipe
US3239591A (en) * 1965-05-06 1966-03-08 Pacific Clay Products Method of making clay pipe
DE1759687A1 (de) * 1968-05-28 1971-07-01 Andersen Jens Bach Verfahren zum Giessen von Beto?en mit mindestens einem profilierten Endteil
DE6927177U (de) * 1969-05-16 1970-01-08 Loeckmann H Verschluesstueck fuer betonrohrformen
US3907949A (en) * 1970-10-27 1975-09-23 Westinghouse Electric Corp Method of making tubular polycrystalline oxide body with tapered ends
DE2825611C2 (de) * 1978-06-10 1982-09-09 Hutschenreuther Ag, 8672 Selb Vorrichtung zum Herstellen dünnwandiger Rohrstücke aus keramischen Werkstoffen
US4937025A (en) * 1987-09-30 1990-06-26 Hydra Corporation Molding apparatus and method
DE4407299C1 (de) * 1994-03-04 1995-05-11 Klaus Strobel Vorrichtung zur Herstellung von hohlzylindrischen Produkten

Also Published As

Publication number Publication date
DE59607627D1 (de) 2001-10-11
ATE205128T1 (de) 2001-09-15
US5779966A (en) 1998-07-14
EP0780204A1 (fr) 1997-06-25
DE19547775C1 (de) 1997-07-31

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