EP0488068B1 - Procédé et dispositif pour la fabrication de moules de fonderie - Google Patents

Procédé et dispositif pour la fabrication de moules de fonderie Download PDF

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Publication number
EP0488068B1
EP0488068B1 EP91119928A EP91119928A EP0488068B1 EP 0488068 B1 EP0488068 B1 EP 0488068B1 EP 91119928 A EP91119928 A EP 91119928A EP 91119928 A EP91119928 A EP 91119928A EP 0488068 B1 EP0488068 B1 EP 0488068B1
Authority
EP
European Patent Office
Prior art keywords
moulding
screen
moulding material
box
molding
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
EP91119928A
Other languages
German (de)
English (en)
Other versions
EP0488068A3 (en
EP0488068A2 (fr
Inventor
Horst Dipl.-Ing. Brandenburger
Norbert Ing. Damm (Grad.)
Thomas Dr. Ing. Parr
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.)
Badische Maschinenfabrik GmbH
BMD Badische Maschinenfabrik Durlach GmbH
Original Assignee
Badische Maschinenfabrik GmbH
BMD Badische Maschinenfabrik Durlach 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 Badische Maschinenfabrik GmbH, BMD Badische Maschinenfabrik Durlach GmbH filed Critical Badische Maschinenfabrik GmbH
Publication of EP0488068A2 publication Critical patent/EP0488068A2/fr
Publication of EP0488068A3 publication Critical patent/EP0488068A3/de
Application granted granted Critical
Publication of EP0488068B1 publication Critical patent/EP0488068B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/12—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose for filling flasks

Definitions

  • the invention relates to a method for producing casting molds from free-flowing molding material, in particular foundry molding sand, which is contained in a filling vessel and, by means of the same, is moved into a molding station with a receiving table, model plate, molding box, optionally a filling space, and is transferred there into the molding box, with classified fine-grained The molding material is applied to the model and then further molding material is transferred to the molding box. Furthermore, the invention is directed to an apparatus for performing this method.
  • the molding material has good flow properties and, if possible, a comparatively small grain size. Since the molding material is reused after the casting of the molding box for reasons of cost and environmental protection and must be prepared for this purpose, compliance with the aforementioned requirements is of particular importance.
  • the molding material to be processed is therefore crushed and converted back into free-flowing form. Nevertheless, it cannot be avoided that the size distribution is not uniform, in particular larger molding material agglomerates remain. Such agglomerates can also form and build up again at any time during the transport of the molding material, so that classification stages (sieves) switched on in the preparation process of the molding material only provide limited relief.
  • the molding material is transported to the molding system by means of conveyors and there - if necessary via an intermediate buffer, e.g. transfer a silo to the filling vessel.
  • an intermediate buffer e.g. transfer a silo to the filling vessel.
  • the filling vessel and the compression device are arranged to be movable above the receiving table with the molding box and can optionally be moved into the molding station by first bringing the filling vessel over the molding box, delivering the necessary amount of molding material to the molding box and then the compression device via the molding box is driven to compress the molding material in the molding box. During this work cycle, the filling vessel reaches a filling position.
  • loose agglomerates can be dissolved, but not those with greater adhesive forces. In any case, however, they require a corresponding dwell time of the molding material in the filling vessel or in the upstream vessels. These dwell times can no longer be reconciled with the high working cycles of today's molding plants. The dwell time can be reduced by correspondingly violent loosening movements, but this in turn requires a high energy input without ultimately leading to completely satisfactory results.
  • model sand is first placed on the model. This was previously done by hand.
  • a screening station has already been arranged outside the molding station, into which the molding box with model plate is placed before it reaches the molding station.
  • the model sand is sieved onto the model with a vibrating sieve. The sieve residue is discarded. Apart from the insufficient loosening, the throughput is low and the cycle time of the molding system increases considerably. There is also increased construction costs and space requirements.
  • the invention has for its object to propose a method by means of which molds with a perfect shape contour and consistent quality can be produced with a high cycle time. Furthermore, the invention is intended to provide a device which allows the same goals to be achieved.
  • this object is achieved in that at least a portion of the molding material which is sufficient to cover the surface of the model is screened off in the filling vessel before or during the transfer to the molding box and transferred to the molding box as a sieve pass, and that the remaining amount is then taken directly into the screen residue the molding box is handed over.
  • At least a subset of the molding material contained in the filling vessel is classified, that is to say it is narrowed to a size corresponding to the mesh size of the sieve.
  • This partial quantity arrives first in the molding box and thus first on the model, so that the increased quality requirements there can be met by a comparatively small molding material size and uniform size distribution.
  • the entire molding material requirement of a molding box can be screened, but this is generally the case for this Time required to be too large. Therefore, only a partial quantity sufficient to cover the surface of the model is screened off as "model sand" and the remaining quantity is transferred directly to the molding box.
  • the invention is based on the known fact that the quality requirements for the molding material are not to be set so high outside the model-related range, so that coarser molding material particles, as well as agglomerates, may also be present there. Since only comparatively small quantities are required to cover the model surfaces, the screening process can be easily integrated into the machine cycles that are common today. The invention also leaves open the possibility of delivering the entire molding material requirement directly to the molding material in the case of molds with not so high quality requirements.
  • the molding material can be loosened during sieving, on the one hand to effect a comminution process and on the other hand to accelerate the classification on the sieve surface.
  • a particularly favorable method of operation is obtained when the partial amount of the molding material is sieved and collected during the travel movement of the filling vessel between a ready position and the molding station and is transferred to the molding box after reaching the molding station.
  • the molding material required to cover the model contour is generated during an already existing dead time (travel movements of the filling vessel) and is available in the desired quantity at the moment when the filling vessel reaches the molding station.
  • the invention provides that the filling vessel has a sieve retaining the molding material and a moving device for sieving fine-grained molding material, and that after this sieving, the sieve can be moved into a position for transferring the sieve residue into the molding box.
  • the sieve provided according to the invention for the production of the “model sand” forms at least part of the filling vessel in such a way that it is able to retain the molding material.
  • the moving material loosens and loosens the molding material lying on the sieve surface and at the same time promotes the passage of the finer molding material particles through the sieve. If the height of the model and molding box is low, the entire molding material requirement can be screened off if necessary. As a rule, however, only a partial amount will be sieved and the sieve back through transfer a corresponding movement of the sieve directly into the molding box.
  • a preferred embodiment of the device according to the invention is characterized in that the screen is designed as a horizontally mounted cylinder screen and has an opening on its jacket.
  • the design as a cylinder sieve, which is arranged in the filling vessel, makes it possible, on the one hand, to accommodate a relatively large amount of molding material, in particular the entire need for a molding box in the sieve, and to loosen the molding material by means of a movement device rotating around the bearing axis. Furthermore, the cylinder screen can be emptied into the molding box in a simple manner by pivoting about its axis, so that even if there is no need for finer model sand, the entire molding material requirement can be transferred from the filling vessel to the molding box in the shortest possible time.
  • the opening of the cylinder screen has an opening angle in the range of at least 90 °. This also makes it easier to transfer the molding material to the sieve.
  • the cylinder screen is formed by two partial cylinder shells, which can be pivoted in the manner of a fish mouth closure optionally into a closed position in which they form the screen and an open position in which they are essentially outside the falling path of the molded materials are arranged.
  • the partial cylinder shells be pivoted away on opposite sides so that the molding material falls directly onto the bottom closure of the filling vessel and is ready for transfer to the molding box. In this case, the movement device remains stopped.
  • the sieve residue after the sieving process has been carried out can be pivoted by pivoting the partial cylinder shells, i.e. by opening the fish mouth closure, empty it very quickly into the molding box, which also leads to shorter cycle times.
  • the partial cylinder shells extend over an arc angle of approx. 90 °, i.e. each have the shape of a quarter-cylinder shell.
  • a movement device which rotates or oscillates about its bearing axis is arranged in the cylinder screen and can, for example, have strips which extend over the screen surface. These in turn are expediently arranged on a turnstile driven in the bearing axis of the cylinder screen.
  • the circulation and loosening of the molding material can be promoted in that several short strips in a row in the axial extension of the cylinder screen are arranged, which are preferably set at an angle to the bearing axis of the cylinder screen.
  • a collecting device for receiving the sieved partial amount of the molding material is arranged at a distance below the sieve and that the collecting device is set up for delivering this partial amount to the molding box.
  • the collecting device picks up the part of the molding material and is designed in such a way that it can deliver this part to the molding box at the molding station.
  • the collecting device can be designed as a kind of shutter. This can be the conventional blind closure of the filling vessel if the cylinder screen is arranged inside the filling vessel.
  • the collecting device in the manner of a fish mouth closure, which concentrically engages under the cylinder sieve and seals the filling vessel at the bottom.
  • the molding system according to Figure 1 has a compression device 1, z. B. in the form of an air pulse unit, and a filling vessel 2, both of which can be moved, for example by means of a common carriage 3, in the plane of the drawing.
  • a filling frame 4 is arranged below the compression device 1.
  • Underneath is a roller conveyor 7 for the molding boxes 8, which move through the molding station from left to right in the drawing.
  • Below the roller table 7 is the receiving table 6 with a turntable 5, which in the exemplary embodiment shown holds two model plates, for example for an upper box and a lower box, so that upper box and lower box models can be molded alternately with this molding system.
  • the filling vessel 2 is filled on a conveyor belt 9 in the embodiment shown. Instead, a storage silo can also be provided, into which the conveyor belt 9 releases the molding material. Inside the filling vessel 2 a sieve 10 is arranged which retains the molding material transferred into the filling vessel.
  • the screen 10 is designed as a cylindrical screen and is provided with an opening 11 on its jacket.
  • the opening has an opening angle of at least 90 °.
  • the opening 11 is located below a funnel-like indentation 12 of the filling vessel 2.
  • a turnstile Arranged inside the cylinder screen 10 on a drive shaft 13 is a turnstile, not shown, which is provided with strips 14, preferably in the form of brush strips, which stroke over the inside of the cylinder screen and circulate the molding material contained in the cylinder screen 10. Due to the movement of the strips 14, the fine molding material particles are classified by the cylinder sieve and pass as a sieve passage onto a collecting device 16 which, in the exemplary embodiment according to FIGS. 2 and 4, is designed as a blind closure of the filling vessel 2.
  • the cylinder screen 10 is then rotated through 180 °, so that the unclassified molding material 15 still contained in the cylinder screen reaches the molding box (FIG. 4).
  • the exemplary embodiment according to FIGS. 5 to 7 differs from that according to FIGS. 2 and 4 only by the different design of the collecting device 16.
  • it is designed as a fish mouth closure with two jaws 18, which are arranged concentrically to the drive shaft 13 and from which in FIG 5 shown, holding the screen passage 17 in the open position shown in FIG. 6, in which the model sand gets into the molding box.
  • the cylinder sieve 10 is then rotated into the position according to FIG. 7 and the sieve residue is dispensed to fill the molding box.
  • the collecting device 16 also forms the lower closure of the filling vessel 2.
  • the exemplary embodiment according to FIGS. 8 and 9 shows a modification of the cylinder screen of the embodiment according to FIGS. 2 to 4.
  • the cylinder screen 10 consists of two partial cylinder shells 10a, which form a half cylinder in their closed position shown in FIG.
  • the partial cylinder shells 10a are rotatably mounted concentrically to the drive shaft 13 and can be pivoted into an opening position, shown in FIG. 9, in which they release both an upper and a lower opening 11 and are arranged essentially outside the path of the molding material.
  • the open position shown in FIG. 9 can be assumed on the one hand in order to allow the molding material that has been introduced into the filling vessel 2 from above to reach the collecting device 16 and thus the model without sieving.
  • the cylinder screen can be opened after the screening process according to FIG. 8 by swiveling up the partial cylinder shells 10a.
  • a cylinder screen 10 in the form of partial cylinder shells 10a can also be used in the exemplary embodiment shown in FIGS. 5 to 7, as shown in FIGS. 10 and 11.
  • both the cylinder sieve 10 and the collecting device 16 are designed as a fish mouth closure with swiveling jaws 10 and 18, the jaws being arranged concentrically and being driven by a common drive device.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Combined Means For Separation Of Solids (AREA)

Claims (18)

  1. Procédé de fabrication de moules de fonderie en matériau de moulage susceptible de s'écouler, en particulier en sable de moulage contenu dans un récipient de remplissage au moyen duquel il est amené dans une station de moulage comprenant une table de réception, une plaque-modèle, un châssis et le cas échéant une rehausse de châssis, station où il est délivré dans le châssis, du matériau de moulage calibré à grains fins étant déposé sur le modèle et un autre matériau de moulage étant ensuite délivré dans le châssis, caractérisé en ce qu'au moins une partie du matériau de moulage suffisante pour couvrir la surface du modèle est tamisée dans le récipient de remplissage avant ou pendant son transfert dans le châssis et délivrée dans le châssis sous forme de produit passé et en ce qu'ensuite la quantité restante est délivrée directement dans le châssis sous forme de refus de tamisage.
  2. Procédé selon la revendication 1, caractérisé en ce qu'au cours du tamisage, le matériau de moulage est aéré.
  3. Procédé selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que la quantité partielle du matériau de moulage est tamisée et recueillie pendant le déplacement du récipient de remplissage entre une position en attente et la station de moulage et délivrée dans le châssis après arrivée à la station de moulage.
  4. Installation de fabrication de moules de fonderie en matériau de moulage susceptible de s'écouler, en particulier en sable de moulage, comprenant un récipient de remplissage (2) de matériau de moulage déplaçable, une station de moulage constituée d'une table de réception, d'une plaque-modèle, d'un châssis (8), le cas échéant d'une rehausse de châssis et d'un dispositif de serrage du matériau de moulage, ainsi que d'un tamis (10) pour le déversement de matériau à grain fin sur le modèle, caractérisée en ce que le récipient de remplissage (2) présente un tamis (10) retenant le matériau de moulage et un dispositif d'agitation (13,14) pour le tamisage de matériau à grains fins, et en ce que postérieurement à ce tamisage, le tamis peut être déplacé dans une position pour délivrer le refus de tamisage (15) dans le châssis (8).
  5. Installation selon la revendication 4, caractérisée en ce que le tamis (10) est disposé dans le récipient de remplissage (2).
  6. Installation selon l'une quelconque des revendications 4 ou 5, caractérisée en ce que le tamis est conformé en tamis cylindrique (10) disposé horizontalement et en ce qu'il présente une ouverture (11) dans son enveloppe.
  7. Installation selon la revendication 6, caractérisée en ce que l'ouverture (11) présente un angle d'ouverture d'environ au moins 90°.
  8. Installation selon l'une quelconque des revendications 6 ou 7, caractérisée en ce que le tamis cylindrique (10) est composé de deux coquilles (10a) de partie de cylindre pouvant être basculées à la manière d'une fermeture en bouche de poisson selon le choix dans une position fermée, dans laquelle elles constituent le tamis, et dans une position ouverte, dans laquelle elles sont disposées sensiblement endehors du trajet de descente du matériau de moulage.
  9. Installation selon la revendication 8, caractérisée en ce que les coquilles de partie de cylindre (10a) s'étendent sur un secteur d'angle d'ouverture d'environ 90°.
  10. Installation selon l'une quelconque des revendications 6 à 9, caractérisée en ce qu'un dispositif d'agitation (13,14) oscillant ou rotatif autour de l'arbre de palier du tamis cylindrique (10) est monté dans ce dernier.
  11. Installation selon l'une quelconque des revendications 4 à 10, caractérisée en ce que le dispositif d'agitation présente des lames (14) passant sur la surface du tamis.
  12. Installation selon la revendication 11, caractérisée en ce que les lames (14) sont montées sur un tourniquet.
  13. Installation selon l'une quelconque des revendications 11 ou 12, caractérisée en ce que plusieurs lames (14) courtes sont disposées à distance les unes derrière les autres dans la direction axiale du tamis cylindrique.
  14. Installation selon l'une quelconque des revendications 11 à 13, caractérisée en ce que les lames (14) courtes sont inclinées par rapport à l'arbre de palier du tamis cylindrique.
  15. Installation selon l'une quelconque des revendications 11 à 14, caractérisée en ce que les lames (14) sont conformées en lames-brosses.
  16. Installation selon l'une quelconque des revendications 4 à 15, caractérisée en ce qu'un dispositif de réception (16) pour la réception de la quantité partielle tamisée (17) du matériau de moulage est disposée à distance sous le tamis (10) et que le dispositif de réception est conçu pour délivrer cette quantité partielle dans le châssis (8).
  17. Installation selon la revendication 16, caractérisée en ce que la conformation du dispositif de réception (16) s'apparente à une fermeture à jalousie.
  18. Installation selon la revendication 16, caractérisée en ce que la conformation du dispositif de réception (16) s'apparente à une fermeture (18) en bouche de poisson.
EP91119928A 1990-11-30 1991-11-22 Procédé et dispositif pour la fabrication de moules de fonderie Expired - Lifetime EP0488068B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4038173 1990-11-30
DE4038173A DE4038173A1 (de) 1990-11-30 1990-11-30 Verfahren und vorrichtung zum herstellen von giessformen

Publications (3)

Publication Number Publication Date
EP0488068A2 EP0488068A2 (fr) 1992-06-03
EP0488068A3 EP0488068A3 (en) 1993-09-01
EP0488068B1 true EP0488068B1 (fr) 1997-02-12

Family

ID=6419267

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91119928A Expired - Lifetime EP0488068B1 (fr) 1990-11-30 1991-11-22 Procédé et dispositif pour la fabrication de moules de fonderie

Country Status (4)

Country Link
EP (1) EP0488068B1 (fr)
JP (1) JP3255951B2 (fr)
DE (2) DE4038173A1 (fr)
ES (1) ES2098302T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105690590B (zh) * 2016-04-01 2017-09-26 西安医学院 一种口腔临床用合成橡胶印模材料的制备方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH462392A (de) * 1967-08-16 1968-09-15 Buehrer Erwin Verfahren zum Dosieren von zwei Formsandsorten in einen Formkasten einer Giessereiform
CH665787A5 (de) * 1984-07-11 1988-06-15 Fischer Ag Georg Verfahren und vorrichtung zum verdichten von koernigen formstoffen.

Also Published As

Publication number Publication date
DE59108542D1 (de) 1997-03-27
JPH05177301A (ja) 1993-07-20
EP0488068A3 (en) 1993-09-01
EP0488068A2 (fr) 1992-06-03
ES2098302T3 (es) 1997-05-01
DE4038173A1 (de) 1992-06-04
JP3255951B2 (ja) 2002-02-12

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