EP0324840B1 - Verfahren und vorrichtung zur herstellung von giessformen mit granuliertem material - Google Patents

Verfahren und vorrichtung zur herstellung von giessformen mit granuliertem material Download PDF

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Publication number
EP0324840B1
EP0324840B1 EP88907004A EP88907004A EP0324840B1 EP 0324840 B1 EP0324840 B1 EP 0324840B1 EP 88907004 A EP88907004 A EP 88907004A EP 88907004 A EP88907004 A EP 88907004A EP 0324840 B1 EP0324840 B1 EP 0324840B1
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EP
European Patent Office
Prior art keywords
plates
armature
envelope
moulds
pattern plates
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
EP88907004A
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English (en)
French (fr)
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EP0324840A1 (de
Inventor
Jean-Jacques Mazeran
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Individual
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Individual
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Priority to AT88907004T priority Critical patent/ATE84736T1/de
Publication of EP0324840A1 publication Critical patent/EP0324840A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C11/00—Moulding machines characterised by the relative arrangement of the parts of same
    • B22C11/10—Moulding machines characterised by the relative arrangement of the parts of same with one or more flasks forming part of the machine, from which only the sand moulds made by compacting are removed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C21/00—Flasks; Accessories therefor
    • B22C21/02—Sectional flasks, i.e. with divided, articulated, or interchangeable side sections
    • 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 subject of the present invention is a device for the manufacture of foundry molds made of granular material according to the preamble of claim 1 and the implementation process according to the preamble of claim 6 .
  • a gas-impermeable sheet such as a plastic film
  • a so-called model form itself placed on a support allowing, by suction, the thermoforming of the plastic film;
  • a "frame" frame is placed over it, equipped with air suction devices and filters intended to retain the sand, the volume thus determined is filled with granular material which can be compacted by vibration;
  • a new sheet of plastic film is placed over it, then, through the chassis, the air trapped between the two plastic films and the chassis is sucked in, which has the effect of giving cohesion to the grains.
  • the chassis is composed of two identical upper and lower parts, each comprising air evacuation tubes connected to a communication passage, itself connected to a vacuum pump.
  • the tubes are distributed regularly, so as to cover a large surface.
  • French patent application No. 2,307,596 relates to a frame of foundry molds in which there is provided a means for introducing and recovering the granular material used.
  • the means consists of a volume of substantially frustoconical shape, the small base being provided with a hatch through which the filling tube can be introduced. This hatch is airtight and remains closed throughout the use of the chassis. After molding, the vacuum is broken, the chassis being turned over, the hatch opens and lets the material flow by gravity.
  • the casting is carried out with the mold produced by assembling the two frames, which immobilizes two expensive frames for obtaining a single mold.
  • Two separate plastic films are brought vertically onto two model plates, which are themselves held vertically.
  • the present invention aims to remedy these drawbacks.
  • the invention as characterized in the claims, solves the problem of creating a device for manufacturing clodding molds, from a granular material, using (vacuum cohesion effect in a polymer envelope conforming to the shape of two model plates placed face to face, with which it is possible to obtain, on a single clod, the two faces necessary for making casting impressions by juxtaposition of identical clods, to allow continuous casting with very reduced handling.
  • the process is semi-continuous, but the casting can be continuous by juxtaposing the lumps.
  • the number of parts required is reduced, as is the volume of granular material used.
  • Figures 1 to 7 constitute the block diagram of manufacturing according to the method and with a device according to the invention.
  • These plates are also each provided with a connector 101 , 120 , 111 , 130 , allowing the connection with a vacuum source and / or compressed air, in known manner.
  • the plates are made from bored plates, or made of porous material, so as to allow the suction during thermoforming and the subsequent blowing for demolding.
  • a polymeric envelope 17 of planar initial shape, is placed on the surface, which is adapted by thermoforming under suction to the profile of the model plates.
  • the plates 10-13 are mounted so that the two model plates are face to face, the shape being oriented inward.
  • the sealing plate 12 serves as a lower support and receives the frame 20 .
  • the sealing plate 13 remains open to the outside.
  • the frame 20 consists of two opposite plates 21,22 connected by two tubes 23,24 , the plates being provided with grooves 28,29 .
  • the tubes are thick enough to give the frame great rigidity.
  • the tubes 23 and 24 open out inside a volume 25 inside the plate 21 , forming a common chamber, and outside this plate, an external connector 26 is provided.
  • This connector can be connected by any flexible pipe to a vacuum source.
  • Handling lugs such as 260 are also provided for transporting the frame.
  • These tubes 23 and 24 are provided with perforations 27 of a diameter such that they allow the passage of air but not that of the grains of the granular material which will be dealt with later.
  • the opposite plates 21 and 22 are connected by a single conduit 230 of rectangular section, the sides of which have a screened surface 270 .
  • Figure 4 shows diagrammatically the filling device consisting of plates, the envelope and the reinforcement by siliceous sand 30, of the type used in molding, or any other suitable granular material.
  • This filling is carried out, for example, using an extension 31 , while the device and sand assembly is subjected to compaction by means of a vibrating table (not shown), symbolized by the arrows 32 .
  • a vibrating table not shown
  • the amplitude and frequency will be adapted according to the granular material, the characteristics and the shapes of the model plates.
  • a vacuum was maintained on the surface of the plates by means of a vacuum source and fittings 101 , 120 , 111 , 130 , which aims to keep the polymer envelope perfectly pressed on the shapes to be reproduce.
  • the assembly is subjected to any compaction by the lower closure plate and a vacuum is applied inside the closed volume 41 by the tubes 23 and 24 connected to a vacuum source by the connector 26 .
  • Figure 6 shows the removal of the model plates and sealing plates. This withdrawal is carried out by removing the depression and, if necessary, by introducing, this time, a slight overpressure to facilitate detachment. This removal is carried out by rotation, as shown in FIG. 6, or by translation, as shown in FIG. 8.
  • the frame 20 and sand 30 assembly in the polymer envelope forms the clod which can be transported.
  • the clods push each other on the pouring area, after installation of any cores.
  • Casting is carried out conventionally by conduits reserved for this use, with or without a counterweight.
  • the batch is transferred to the release station which will, by removing the vacuum, recover the cast product on the one hand, the reinforcement and the sand on the other.
  • a continuous process can be provided with transfer and clod supply one by one.
  • additional tightening can be provided by at least the lower sealing plate 12 and, optionally, the upper sealing plate 13 .
  • a mechanical or pneumatic device for example, intended to deform, is placed on the lower 12 and upper 13 sealing plates. the polymeric envelope 17 and pushing back the sand 30 . This operation is especially useful in complex forms.
  • the polymeric envelope can be covered with a layer of a particular product, intended to facilitate release, for example.
  • the direction of the vibrations can be varied to obtain a better quality of compaction.
  • a variant of the invention proposes to produce a peripheral groove on the end plates of the frame, which is put in relation with the common depression room.
  • the support it comprises, on the corresponding edges, an inflatable seal.
  • the process consists, before the introduction of the sand, in pressing the edge of the polymeric envelope in the groove by the inflatable seal, in carrying out the operations of filling, compacting, leveling, welding, then in depressurizing the sand and the common room, which plates the edge of the envelope in the groove, the support and the plates can be easily removed.
  • the invention proposes a variant for producing the tubes.
  • These can be hollow, of square or rectangular section.
  • a microporous or bored plate is added at a certain distance from the surface of the tube, in particular by means of threaded lugs. Two corridors parallel to the central tube are thus defined.
  • the method makes it possible to use a three-sided reinforcement, with two model plates articulated around a closure plate, two polymer sheets, which are welded in the upper part after filling and compacting, before vacuum the contents.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Continuous Casting (AREA)
  • Making Paper Articles (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (8)

  1. Vorrichtung zur Herstellung von Gußformen für kastenlosen Guß aus einem körnigen Material wie Quarzsand (30) unter Benutzung des Kohäsionseffekts durch Vakuum in einer Polymerhülle, die sich an zwei Modellplatten (10, 11) anlegt, die einander gegenüber angeordnet sind, wobei die genannte Vorrichtung neben den Modellplatten (10, 11) noch Dichtungsplatten (12, 13), die zwischen den Modellplatten (10, 11) liegen, eine Armierung (20), um die Modellplatten (10, 11) und die Dichtungsplatten (12, 13) zu halten und um die Handhabung des Spreizkastens zu ermöglichen, wenigstens eine Polymerhülle (17), in die Armierung (20) eingebaute Rohre (23, 24) zum In-Vakuum-Setzen, ein Mittel zum Einfüllen von körnigem Material sowie äußere Mittel zum In-Vakuum-Setzen aufweist,
    dadurch gekennzeichnet, daß
    sie aus wenigstens zwei Modellplatten (10, 11) besteht, die in die Sitze (100, 110) einer Halterung (1) eingesetzt sind und eine Bodendichtungsplatte (12) einschließen, die zwischen den Sitzen (100, 110) der Modellplatten (10, 11) liegt, daß die Armierung höchstens drei Flächen aufweist, die mit den Modellplatten (10, 11) die Form des Spreizkastens umgrenzen, und daß die Polymerhülle (17) eine einzige Hülle ist und die Oberfläche der Modellplatten (10, 11) und der Dichtungsplatten (12, 13) bedeckt.
  2. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, daß
    sie eine obere Dichtungsplatte (12) aufweist.
  3. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, daß
    die Sitze (100, 110) der Modellplatten (10, 11) und die Dichtungsplatten (12, 13) miteinander gelenkig verbunden sind.
  4. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, daß
    die Armierung (20) aus zwei einander gegenüberliegenden Platten (21, 22) besteht, die durch Rohre (23, 24) oder durch eine vergitterte (270) Leitung (230) zum Luftabführen miteinander verbunden sind.
  5. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, daß
    die Halterung (1) der Platten (10, 11, 12, 13) eine aufblasbare Verbindung aufweist, die dazu vorgesehen ist, die Polymerhülle (17) in Vertiefungen (28, 29) einzuziehen, die in den Seiten der einander gegenüberliegenden Platten (21, 22) der Armierung (20) angeordnet sind, wobei dies von den mit Löchern (27) versehenen Rohren (23, 24) über einen Raum (25) ausgeübt wird, der in einer der Platten (21) der Armierung (20) ausgebildet ist.
  6. Verfahren zur Ausführung der Vorrichtung nach den Ansprüchen 1 bis 5, um an einem einzigen Spreizkasten die beiden Flächen zu erhalten, die für die Ausführung eines Gußformnests durch Aneinanderlegen von zwei gleichen Spreizkästen erforderlich sind,
    dadurch gekennzeichnet, daß
    es aus den folgenden Schritten besteht:
    - Einsetzen der zwei entsprechenden Modellplatten (10, 11) in ihre jeweiligen Sitze (100, 110),
    - Anbringen einer Polymerhülle (17) an den Modellplatten (10, 11) und Dichtungsplatten (12, 13) durch Warmformung und Ansaugen durch die Platten hindurch,
    - Anbringen der Modellplatten (10, 11) und der Dichtungsplatten (12, 13) um eine Armierung (20) herum, die aus zwei Platten (21, 22) besteht,
    - Herstellen der Dichtigkeit zwischen Armierung (20) und Platten (10, 11, 12, 13) durch Einpressen oder Einziehen der Hülle (17) in die Vertiefungen (28, 29) der Armierungsplatten (21, 22) durch Aufblasen der Verbindung,
    - Einfüllen des körnigen Materials, Verdichten und Abstreichen,
    - Verbinden der Ränder der Polymerhülle durch Verschweißen der beiden Folienenden,
    - Zurückziehen der Platten,
    - Zusammensetzen durch Aneinanderlegen der erzielten Spreizkästen für die Bildung einer Reihe von Abdrücken.
  7. Verfahren nach Anspruch 6,
    dadurch gekennzeichnet, daß
    ein zusätzlicher Druck auf die Einheit Hülle/Sand ausgeführt wird, indem auf wenigstens eine der Dichtungsplatten an einer Stelle, an der vorgesehen ist, daß sie biegsam ist, ein Schub ausgeführt wird, damit unter Wirkung des Unterdrucks diese zusätzliche Verformung bleibend wird.
  8. Verfahren nach Anspruch 7,
    dadurch gekennzeichnet, daß
    dieser Schub gleichzeitig mit einer zusätzlichen Verdichtung mit oder ohne Rütteln erfolgt.
EP88907004A 1987-07-22 1988-07-20 Verfahren und vorrichtung zur herstellung von giessformen mit granuliertem material Expired - Lifetime EP0324840B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88907004T ATE84736T1 (de) 1987-07-22 1988-07-20 Verfahren und vorrichtung zur herstellung von giessformen mit granuliertem material.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8710514 1987-07-22
FR8710514A FR2618358B1 (fr) 1987-07-22 1987-07-22 Procede et dispositif de fabrication de moules a partir de materiau granulaire

Publications (2)

Publication Number Publication Date
EP0324840A1 EP0324840A1 (de) 1989-07-26
EP0324840B1 true EP0324840B1 (de) 1993-01-20

Family

ID=9353522

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88907004A Expired - Lifetime EP0324840B1 (de) 1987-07-22 1988-07-20 Verfahren und vorrichtung zur herstellung von giessformen mit granuliertem material

Country Status (9)

Country Link
US (1) US4940071A (de)
EP (1) EP0324840B1 (de)
JP (1) JPH02500096A (de)
AT (1) ATE84736T1 (de)
AU (1) AU2121688A (de)
CA (1) CA1334782C (de)
DE (1) DE3877736T2 (de)
FR (1) FR2618358B1 (de)
WO (1) WO1989000467A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2672233B1 (fr) * 1991-02-01 1993-05-07 Mazeran Jean Jacques Dispositif et procede de fabrication de moules de fonderie en materiau granulaire.
ZA923274B (en) * 1991-05-06 1993-11-08 Du Pont Process for the manufacture of pentafluoroethane

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE789785A (fr) * 1971-10-08 1973-02-01 Akita Kk Appareil de production de moule
DE2305229C3 (de) * 1972-02-04 1975-04-17 Sintokogio, Ltd., Nagoya, Aichi (Japan) Formkasten
DE2407878C2 (de) * 1974-02-19 1975-12-18 Heinrich Wagner, Maschinenfabrik, 5928 Laasphe Kastenlose Gießform
JPS5111018A (ja) * 1974-07-19 1976-01-28 Janome Sewing Machine Co Ltd Inbesutomentochuzohoniokeru mokeikumitatehoho
DE2516158C3 (de) * 1975-04-14 1978-06-22 Heinrich Wagner Maschinenfabrik, 5928 Laasphe Formkasten für vakuumgebundene Gießformen
SU534291A1 (ru) * 1975-07-25 1976-11-05 Институт Проблем Литья Ан Украинской Сср Литейна оснастика
JPS5570442A (en) * 1978-11-20 1980-05-27 Sintokogio Ltd Forming method of film for vacuum core making
JPS58221631A (ja) * 1982-06-18 1983-12-23 Hitachi Ltd 鋳造法
DE3320881A1 (de) * 1983-06-09 1984-12-13 Buderus Ag, 6330 Wetzlar Verfahren zum herstellen einer giessform
SU1311840A1 (ru) * 1985-03-07 1987-05-23 Предприятие П/Я Г-4874 Литейна оснастка дл изготовлени преимущественно крупногабаритных стержней вакуумно-пленочной формовкой

Also Published As

Publication number Publication date
EP0324840A1 (de) 1989-07-26
FR2618358B1 (fr) 1991-01-18
US4940071A (en) 1990-07-10
ATE84736T1 (de) 1993-02-15
DE3877736T2 (de) 1993-08-19
WO1989000467A1 (fr) 1989-01-26
CA1334782C (fr) 1995-03-21
DE3877736D1 (de) 1993-03-04
JPH02500096A (ja) 1990-01-18
FR2618358A1 (fr) 1989-01-27
AU2121688A (en) 1989-02-13

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