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EP0067413B1 - Dispositif pour la fabrication de moules - Google Patents

Dispositif pour la fabrication de moules Download PDF

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Publication number
EP0067413B1
EP0067413B1 EP82105047A EP82105047A EP0067413B1 EP 0067413 B1 EP0067413 B1 EP 0067413B1 EP 82105047 A EP82105047 A EP 82105047A EP 82105047 A EP82105047 A EP 82105047A EP 0067413 B1 EP0067413 B1 EP 0067413B1
Authority
EP
European Patent Office
Prior art keywords
vacuum
mould box
screen surface
backfill material
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
Application number
EP82105047A
Other languages
German (de)
English (en)
Other versions
EP0067413A1 (fr
Inventor
Herbert Grolla
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.)
Heinrich Wagner Sinto Maschinenfabrik GmbH
Original Assignee
Heinrich Wagner Sinto Maschinenfabrik 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 Heinrich Wagner Sinto Maschinenfabrik GmbH filed Critical Heinrich Wagner Sinto Maschinenfabrik GmbH
Priority to AT82105047T priority Critical patent/ATE10813T1/de
Publication of EP0067413A1 publication Critical patent/EP0067413A1/fr
Application granted granted Critical
Publication of EP0067413B1 publication Critical patent/EP0067413B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding

Definitions

  • the invention relates to a device for the vacuum molding process for the production of casting molds from binder-free refractory backfill, which is enclosed between foils and solidified by the negative pressure generated inside the backfill, with a molding box which has a vacuum collecting channel in at least one wall, and at least one in the the vacuum cavity arranged in the mold cavity of the mold box, which is connected to the vacuum collecting duct and has evacuation openings distributed over its circumference.
  • a device of this type is e.g. B. from DE-C3-2 248 968 known.
  • the molding box consists of a frame-shaped structure, in one side wall of which a vacuum collecting duct is arranged with a connection for connection to a vacuum source, e.g. B. a vacuum pump.
  • a vacuum source e.g. B. a vacuum pump.
  • vacuum manifold vacuum lines are firmly connected on one side, which extend through the space receiving the backfill. On their circumference, these vacuum lines have a large number of openings through which the air contained in the backfill can be evacuated. However, these openings are so small that the granular backfill cannot penetrate into the vacuum lines.
  • the invention has for its object to provide a device of the type mentioned in such a way that even if the vacuum lines are damaged, penetration of the backfill and liquid material into the vacuum system of the device is prevented, thus preventing possible damage to the device, the vacuum system and accidents and that the vacuum lines contained in the device can be easily replaced or their arrangement can be changed.
  • the vacuum channel is opened through a screen surface to the mold cavity and that the vacuum line is also provided on at least one end face with a screen surface and is inserted into the mold box in such a way that its screen surface of the screen surface of the mold box in one entry from the backfill permitting distance.
  • a device thus has vacuum lines embedded in the backfill, which have no mechanical connection to the side walls of the device.
  • the vacuum lines themselves are closed on all sides and have sieve surfaces on both their end faces and on their peripheral surfaces, through which the air contained in the backfill can be sucked in.
  • These vacuum lines are placed loosely in the backfill, the screen surfaces of the vacuum lines lying opposite the screen surfaces in the walls of the molding box. Since the vacuum lines are shorter than the distance between opposite screen surfaces, there remains a distance between the screen surfaces of the device and the screen surfaces of the vacuum lines, which is filled with backfill material.
  • the Vacuum lines lying in the backfill are thus coupled to the vacuum system of the device with the interposition of a defined layer of backfill.
  • any vacuum line is damaged, it can simply be removed from the device because there are no mechanical connections.
  • Another advantage is that due to the loose arrangement of the vacuum lines in the device, these can be laid at the most convenient locations in foundry technology. On the other hand, this means that a device according to the invention is suitable for different casting molds.
  • the vacuum lines can be installed in the device without any fastening. However, it is advantageous to place the vacuum lines on supports arranged on the side walls having the screen surfaces, which advantageously have spacer elements, with the aid of which the distance of the end faces of the vacuum lines from the screen surfaces is determined.
  • the vacuum lines are advantageously held on the supports with the aid of quick attachments in the form of resilient tabs.
  • the ends of the vacuum lines are expanded in a trumpet shape, so that the cross section of the front screen surface is larger than the cross section of the other vacuum line.
  • the device 1 according to the invention shown in FIGS. 1 and 2 consists of a rectangular molding box 2, which is open on its lower and upper side, in the side walls of which a circumferential vacuum collecting duct 3 is arranged. To the interior of the device 1, this vacuum collecting duct is opened on two opposite sides 5, 6 via a sieve surface 4. A plurality of supports 7 are attached to the screen surfaces 4 and serve to receive a vacuum line 8. The length of this vacuum line 8 is slightly less than the distance between the two opposite sieve surfaces 4. This means that between each sieve surface 4 and the end face 9 of the vacuum line 8, an intermediate space is formed, which is filled with backfill when filling the backfill 10 into the device 9 is.
  • the supports 7 are of stepped design and form a stop 11 for the vacuum line 8, so that the latter is fixed at a distance from the sieve surfaces 4.
  • a resilient tab 12 which extends over the end of the vacuum line 8 and presses it against the support 7.
  • the vacuum line 8 which has evacuation openings on its entire circumferential surface, is trumpet-shaped at both ends, so that the screen surfaces 13 formed on its end faces have a larger cross section than the cross section of the other vacuum line 8. This results in a better coupling of the vacuum line 8 given the vacuum manifold 3 in the device 1.
  • This vacuum manifold 3 is provided with a connection 14 through which the vacuum channel to a vacuum source, for. B. a vacuum pump can be connected.
  • the device 1 according to the invention is placed on a model plate 16 which carries a model 15.
  • the model plate 16 is in turn provided with a vacuum channel 17, which can be connected via a connection 18 to a vacuum source, not shown.
  • the vacuum channel 17 is connected via holes 19 to the top of the model plate, so that the film 20 placed on the model plate is sucked onto the model plate and the model.
  • 8 backfill agent is then poured in via the still free upper side of the device 1 and, if necessary, pre-compressed by means of a vibrator.
  • a cover film 21 is then placed on the device 1 and the interior of the device is evacuated via the vacuum collecting duct 3 and the evacuation lines 8.
  • the vacuum line 8 is coupled to the vacuum collecting duct 3 via a thin layer of backfill material located between the two screen surfaces 4 and 13 of the device or the vacuum line 8.
  • the thickness of this Backfill mass layer is determined by the distance between the two screen surfaces 4 and by the length of the vacuum line 8.
  • the negative pressure in the negative pressure line 17 of the model plate 16 is released, so that the device 1 can now be lifted off the model plate 16.
  • the other mold half is produced in the same way and the casting takes place after the two mold halves have been assembled into a mold.
  • Damaged vacuum lines 8 are very easy to replace in a device according to the invention, since, if mechanical holders are provided in the device at all, they are only held by simple clamping devices. The vacuum lines can be replaced in just a few simple steps.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Claims (7)

1. Dispositif utilisable dans le procédé de moulage par le vide pour la fabrication de moules de coulée à partir d'une matière réfractaire de tamponnage exempte de liant, qui est incluse entre des feuilles minces et est rendue compacte par une dépression produite à l'intérieur de la matière de tamponnage, dispositif qui comprend un châssis (2) comportant, dans l'une au moins de ses parois (5, 6), un conduit collecteur de dépression (3), et une conduite de dépression (8) au moins qui est disposée dans la cavité du châssis recevant la matière de tamponnage (10), qui est raccordée fonctionnellement au conduit collecteur de dépression (3) et qui présente des ouvertures de mise sous vide réparties sur sa circonférence, caractérisé en ce que le conduit collecteur de dépression (3) s'ouvre dans la cavité de moulage à travers une surface de tamisage (4) et en ce que la conduite de dépression (8) est également munie d'une surface de tamisage (13) sur l'une au moins de ses faces frontales (9) et est placée dans le châssis (2) de telle manière que sa surface de tamisage (13) soit située en face de la surface de tamisage (4) du châssis à une distance permettant l'introduction de matière de tamponnage.
2. Dispositif selon la revendication 1, caractérisé en ce que le châssis (2) présente, dans au moins deux parois latérales opposées, des conduits collecteurs de dépression (3) qui s'ouvrent à l'intérieur du châssis (2) à travers une surface de tamisage (4) chacun, et en ce qu'il est placé, entre les deux surfaces de tamisage opposées (4), des conduites de dépression (8) dont la longueur est un peu plus petite que la distance entre les surfaces de tamisage opposées et qui sont fermées, sur chacune de leurs deux faces frontales (9), par une surface de tamisage (13).
3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que les extrémités des conduites de dépression (8) sont réalisées avec une forme s'élargissant en trompette.
4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'il est disposé, sur les parois latérales du châssis (2) qui comportent les surfaces de tamisage (4), des supports (7) pour les conduites de dépression (8).
5. Dispositif selon la revendication 4, caractérisé en ce que les supports (7) comportent des butées (11) servant d'éléments d'écartement pour la fixation d'une distance définie entre les surfaces de tamisage (4) du châssis (2) et les surfaces de tamisage (13) de chaque conduite de dépression (8).
6. Dispositif selon l'une quelconque des revendications 1 à 5, caractérisé en ce que des éléments de fixation (12) pour les conduites de dépression (8) sont disposés au-dessus des supports (7).
7. Dispositif selon la revendication 6, caractérisé en ce que les éléments de fixation sont constitués par des pattes à ressort (12).
EP82105047A 1981-06-12 1982-06-09 Dispositif pour la fabrication de moules Expired EP0067413B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82105047T ATE10813T1 (de) 1981-06-12 1982-06-09 Vorrichtung fuer die herstellung von giessformen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3123363 1981-06-12
DE3123363A DE3123363C1 (de) 1981-06-12 1981-06-12 Vorrichtung fuer die Herstellung von Giessformen

Publications (2)

Publication Number Publication Date
EP0067413A1 EP0067413A1 (fr) 1982-12-22
EP0067413B1 true EP0067413B1 (fr) 1984-12-19

Family

ID=6134566

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82105047A Expired EP0067413B1 (fr) 1981-06-12 1982-06-09 Dispositif pour la fabrication de moules

Country Status (3)

Country Link
EP (1) EP0067413B1 (fr)
AT (1) ATE10813T1 (fr)
DE (1) DE3123363C1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102189231A (zh) * 2010-03-10 2011-09-21 新东工业株式会社 减压造型用型箱

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3318702C1 (de) * 1983-05-21 1984-03-29 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Formkasten fuer das Vakuumformverfahren
FR2649916A1 (fr) * 1989-07-18 1991-01-25 Ferrer Erick Moule universel a surfaces de moulage adaptables pour le moulage de matieres plastiques, ceramiques ou autres materiaux
CN101954448A (zh) * 2010-11-12 2011-01-26 侯松发 在负压造型工艺中用的封闭气室模型
CN103567395A (zh) * 2013-09-30 2014-02-12 张家港万富安化工设备铸件装备有限公司 一种用于翻砂铸造的抽真空装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1536795A1 (de) * 1967-04-20 1969-10-30 Ferch & Nabben Filterelement
BE789785A (fr) * 1971-10-08 1973-02-01 Akita Kk Appareil de production de moule
US3825058A (en) * 1972-04-15 1974-07-23 Sintokogio Ltd Mold prepared by vacuum sealed molding process
DE8029438U1 (de) * 1980-11-05 1981-03-19 Passavant-Werke Michelbacher Hütte, 6209 Aarbergen Formkasten fuer das vakuumformverfahren

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102189231A (zh) * 2010-03-10 2011-09-21 新东工业株式会社 减压造型用型箱

Also Published As

Publication number Publication date
DE3123363C1 (de) 1982-11-04
EP0067413A1 (fr) 1982-12-22
ATE10813T1 (de) 1985-01-15

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