EP0597335B1 - Procédé et appareil pour la régéneration de sable de fonderie usagé - Google Patents

Procédé et appareil pour la régéneration de sable de fonderie usagé Download PDF

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Publication number
EP0597335B1
EP0597335B1 EP93117552A EP93117552A EP0597335B1 EP 0597335 B1 EP0597335 B1 EP 0597335B1 EP 93117552 A EP93117552 A EP 93117552A EP 93117552 A EP93117552 A EP 93117552A EP 0597335 B1 EP0597335 B1 EP 0597335B1
Authority
EP
European Patent Office
Prior art keywords
sand
container
treatment container
friction
cleaning
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
EP93117552A
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German (de)
English (en)
Other versions
EP0597335A1 (fr
Inventor
Norbert Damm
Tao Dr. Ing. Wang
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 EP0597335A1 publication Critical patent/EP0597335A1/fr
Application granted granted Critical
Publication of EP0597335B1 publication Critical patent/EP0597335B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
    • 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
    • B22C5/18—Plants for preparing mould materials

Definitions

  • the invention relates to a method for the regeneration of foundry sand by circulating the old sand in a processing room and thereby bringing about the friction forces breaking up the binder shell and releasing the grain of sand from the old sand particles, and the resulting mixture of sand and binder particles being physically cleaned while enriching the sand content. Furthermore, the invention relates to a device for the regeneration of foundry sand with a processing container, which has a controllable inlet, an outlet on its circumference close to the floor and at least one rotating tool rotating above the floor.
  • thermal-mechanical methods are also known, in which, for example, the old sand is circulated in a single processing container and simultaneously or batchwise exposed to a burner flame and is further mechanically loaded by means of mechanical friction and scouring tools in order to break the binder casing (EP 0 125 384 A1) .
  • the thermal pretreatment and the mechanical aftertreatment take place in separate rooms.
  • the mechanical processing room the thermally pretreated old sand is circulated using rotating tools and at the same time fluidized using compressed air coming in from below and this fluidizing air is drawn off above the sand surface.
  • the binder casing is to be separated from the sand particles by the rotating tools, unless already done in the thermal pretreatment.
  • the detached binder particles are to be constantly removed with the fluidizing air will. Apart from the problematic thermal pretreatment, the efficiency in the mechanical stage is poor.
  • the invention has for its object to effectively regenerate old sands with mixtures of different binders, especially problematic binders such as bentonite and / or water glass, in a purely mechanical way.
  • this object is achieved in that a part of the mixture of substances is drawn off from the processing space into a separate cleaning space and cleaned after passing through the friction zone, and the pre-cleaned old sand is returned to the processing space.
  • the old sand in the processing room is only subjected to friction and pressure forces, the sand batch contained in the processing room bearing its own weight on the friction zone, so that intensive mechanical pressure is exerted by the processing tools on the particles, but also intense friction and abrasion forces between the particles, which on the one hand to rub off the binder shell, and on the other hand to shred of the particles of the binder casing so that two relatively sharply separated grain spectra, sand particles on the one hand and binder particles on the other hand, are present in the mixture of substances leaving the friction zone.
  • This mixture of substances is drawn off from the friction zone of the processing area and transferred to a separate cleaning area, in which the binder particles are largely separated.
  • the used sand pre-cleaned in this way is transferred again from the cleaning chamber into the processing room in order to rub off any adhering binder in a further treatment.
  • These circulation cycles are carried out several times if necessary and the finally sufficiently binder-free regenerated sand is returned to the production process. It is essential for the method according to the invention to separate the processing and cleaning stages, so that each can be carried out under optimal conditions. It is particularly important to note that there is no fluidization in the processing area and that the batch contained in the processing area has the lowest possible pore volume in order to allow the friction and abrasive forces to act on the largest possible surface of the sand particles.
  • the old batch of sand moves under gravity from top to bottom into the friction zone in the processing space and the material mixture is drawn off essentially horizontally in the area.
  • the entire sand batch of the processing space is loaded on the friction zone with the previously described advantage of high particle density and low pore volume in the friction zone.
  • the mixture of substances is drawn off directly from the area of the friction zone in order to feed it for pre-cleaning (separation of the binder particles).
  • the mixture of substances is mechanically displaced outward in the region of the friction zone and pneumatically conveyed away at the periphery of the processing space.
  • the mixture of substances is displaced in the area of the friction zone by the pressure and circulation forces.
  • the pneumatic conveying away of the mixture of substances at the periphery of the processing space creates a negative pressure near the friction zone, which contributes to reducing the pore volume of the bed in the friction zone.
  • the invention is based on the device mentioned at the beginning (EP 0 343 272), which according to the invention is characterized in that outside the processing container a cleaning chamber for separating sand and binder particles is provided, which is arranged in a conveyor circuit connecting the outlet of the processing container with its inlet.
  • the processing container and the cleaning chamber are in a closed conveyor circuit. After the untreated old sand has been placed on the processing container, it may pass through the cleaning chamber and the processing container several times and is continuously cleaned of the binder particles accumulating in the friction zone.
  • a buffer container can be arranged between the cleaning chamber and the processing container in order to obtain a homogenization of the mixture of substances in front of the processing zone and to ensure that the bulk material column in the processing container is always the same.
  • the reaming tool rotates directly above the bottom of the processing container and the drain is arranged in the rotating plane of the reaming tool. The mixture of substances is therefore removed directly from the friction zone.
  • the reaming tool can have two or more rice arms which extend into the region of the circumference of the processing container.
  • the pressure on the friction zone can be increased in that a pressure generating element acting on the sand filling, for example a worm, acts above the grinding tool. is arranged.
  • the conveyor circuit is formed by a pneumatic conveyor device which has an injector at the outlet of the processing container and a conveyor line leading from there into the cleaning chamber.
  • the cleaning chamber can basically have any structure. In connection with a pneumatic conveying device, a design is recommended in which the cleaning chamber is designed as a centrifugal separator and has a dust extraction.
  • the processing container can have a plurality of processes distributed around the circumference in order to increase the circulation quantity, and possibly also to be able to control it.
  • a pneumatic delivery line is connected to each outlet.
  • a processing container 1 can be seen, which has an inlet 2 on its top, the is controllable by means of a flap 3.
  • the processing container 1 has an outlet 5.
  • the outlet 5 opens into a pneumatic conveyor line 6 with a rising conveyor.
  • the pneumatic delivery line 6 connects the outlet 5 to a cleaning chamber 7 (see FIG. 2), which in the exemplary embodiment shown is designed as a centrifugal separator and is placed on a buffer silo 8.
  • the buffer silo 8 in turn is connected to the processing container 1 via the inlet 2, so that a closed conveyor circuit is produced from the outlet 5 of the processing container 1 via the riser 6, the cleaning chamber 7, the buffer container 8 and the inlet 2 of the processing container.
  • the used sand accumulating in the foundry is collected in a silo 9 and, from there, pneumatically or mechanically, as indicated by the conveying line 10, it is fed to the cleaning chamber 7 and from there via the buffer silo into the processing container 1, to be recirculated into the cleaning chamber 7 after it has passed through the outlet 5 and the riser 6.
  • a branch line 11 is connected to the riser 6, which leads into a silo 12, in which the regenerated sand is conveyed after a certain number of working cycles in the processing container 1.
  • the sand is drawn off from the regenerated silo 12 into the sand preparation and / or into the core production of the foundry.
  • the cleaning chamber 7 and the silos 9, 10 are in turn connected to the suction line 13 of a dedusting system 14.
  • a revolving reaming tool 15 is arranged within the processing container 1 directly above its bottom 4, which several to Rough arms 16 reaching approximately to the circumference of the processing container 1.
  • the reaming tool 15 is rotated by a drive shaft 17 mounted beneath the floor and penetrating it.
  • the processing container 1 is equipped on the inside with a wear layer 18.
  • the sand column located within the processing container 1 bears on the friction zone 19 swept by the reaming tools 15.
  • the used sand mainly runs into the friction zone 19 in the central region.
  • the sand particles in the friction zone are exposed to intense frictional forces, which rub off the binder shell adhering to them.
  • the sand particles and the particles of the binder casing migrate outward from the friction zone 19 into the outlet 5 and are transported there by the conveying air blown in at 20 via the riser 6 into the cleaning chamber 7.
  • the pneumatic conveying creates a negative pressure at outlet 5, which leads to a reduction in the pore volume in the friction zone 19.
  • the sand particles are separated by centrifugal and gravitational forces, while the binder particles reach the dedusting system 14 via the suction line 13.
  • the pre-cleaned used sand arrives from the cleaning zone 7 into the buffer tank 8 and after a corresponding dwell time back into the processing tank 1. After several passes, binder-free regenerated sand is finally obtained, which is drawn off into the silo 12 via the conveying line 11.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Claims (18)

  1. Procédé de nettoyage de sable de décochage dans lequel on fait circuler le vieux sable dans une chambre de traitement, tout en générant, au niveau des grains de vieux sable, des forces de friction cassant l'enveloppe de liant et la détachant du grain de sable et tout en nettoyant physiquement, par concentration de la composante sable, le matériau obtenu consistant en un mélange de sable et de particules de liant, caractérisé en ce qu'une partie du mélange de matériaux est entraînée de la chambre de traitement, après passage dans la zone de friction, dans une chambre de nettoyage séparée où elle est nettoyée, et en ce que le vieux sable prénettoyé est réintroduit dans la chambre de traitement.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on fait circuler à plusieurs reprises le mélange de matériaux ou le vieux sable prénettoyé entre la chambre de traitement et la chambre de nettoyage.
  3. Procédé selon l'une quelconque des revendications 1 ou 2, caractérisé en ce qu'à proximité de la zone de friction, on réduit le volume poreux du mélange de matériau.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'on compacte le mélange de matériau à proximité de la zone de friction par pression mécanique.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que lors de l'évacuation du mélange de matériaux de la chambre de traitement, on aspire de l'air de la zone de friction.
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la charge de vieux sable dans la chambre de traitement se déplace sous l'effet de la gravité du haut en bas dans la zone de friction et qu'à proximité de celle-ci, le mélange de matériaux est évacué vers l'extérieur sensiblement horizontalement.
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le mélange de matériaux à proximité de la zone de, friction est refoulé mécaniquement vers l'extérieur et emmené pneumatiquement à la périphérie de la chambre de traitement.
  8. Dispositif pour la régénération de sable de décochage comprenant une cuve de traitement (1) présentant une entrée à commande d'orientation (2), à sa périphérie juste au-dessus du fond (4) unie sortie (5) et au moins un outil rotatif de friction (15) au-dessus du fond (4), caractérisé en ce qu'il est prévu, en plus de la cuve de traitement (1), une chambre de nettoyage (7) pour séparer le sable et les particules de liant, disposée dans un circuit de convoyage reliant la sortie (5) du récipient de traitement (1) à son entrée (2).
  9. Dispositif selon la revendication 8, caractérisé en ce qu'un réservoir-tampon (8) est disposé entre la chambre de nettoyage (7) et la cuve de traitement (1).
  10. Dispositif selon l'une quelconque des revendications 8 ou 9, caractérisé en ce que l'outil de friction (15) tourne directement au-dessus du fond (4) de la cuve de traitement (1) et en ce que la sortie (5) est ménagée dans le plan de rotation de l'outil de friction (15).
  11. Dispositif selon l'une quelconque des revendications 8 à 10, caractérisé en ce que l'outil de friction (15) présente au moins deux bras de friction (16) s'étendant jusque dans la zone périphérique de la cuve de traitement (1).
  12. Dispositif selon l'une quelconque des revendications 8 à 11, caractérisé en ce qu'un organe générateur de pression agissant sur la charge de sable, par exemple une vis sans fin, est disposé au-dessus de l'outil de friction (15).
  13. Dispositif selon l'une quelconque des revendications 8 à 12, caractérisé en ce que le circuit de convoyage est constitué d'une installation de convoyage pneumatique, présentant un injecteur au niveau de la sortie (5) du réservoir de traitement (1) et un conduit de convoyage (6) menant de cette sortie dans la chambre de nettoyage (7).
  14. Dispositif selon l'une quelconque des revendications 8 à 13, caractérisé en ce que la chambre de nettoyage (7) est conformée en trieuse centrifuge et présente une évacuation pour la poussière.
  15. Dispositif selon l'une quelconque des revendications 8 à 14, caractérisé en ce que la cuve de traitement (1) présente plusieurs sorties (5) réparties sur sa périphérie.
  16. Dispositif selon l'une quelconque des revendications 9 à 15, caractérisé en ce que le réservoir-tampon (8) peut contenir 5 à 50 fois, de préférence 10 à 20 fois le volume de charge de la cuve de traitement (1).
  17. Dispositif selon l'une quelconque des revendications 8 à 16, caractérisé en ce que plusieurs cuves de traitement (1) et chambres de nettoyage (7) sont montées en rang les unes derrière les autres.
  18. Dispositif selon l'une quelconque des revendications 9 à 17, caractérisé en ce que plusieurs cuves de traitement (1) sont reliées à un réservoir-tampon (8) par l'intermédiaire d'une ou plusieurs chambres de nettoyage (7).
EP93117552A 1992-11-10 1993-10-29 Procédé et appareil pour la régéneration de sable de fonderie usagé Expired - Lifetime EP0597335B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4237838A DE4237838A1 (de) 1992-11-10 1992-11-10 Verfahren und Vorrichtung zum Regenerieren von Gießereialtsand
DE4237838 1992-11-10

Publications (2)

Publication Number Publication Date
EP0597335A1 EP0597335A1 (fr) 1994-05-18
EP0597335B1 true EP0597335B1 (fr) 1997-07-23

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EP93117552A Expired - Lifetime EP0597335B1 (fr) 1992-11-10 1993-10-29 Procédé et appareil pour la régéneration de sable de fonderie usagé

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EP (1) EP0597335B1 (fr)
DE (2) DE4237838A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8632850B2 (en) 2005-09-26 2014-01-21 Schultz-Creehan Holdings, Inc. Friction fabrication tools
US8636194B2 (en) 2005-09-26 2014-01-28 Schultz-Creehan Holdings, Inc. Friction stir fabrication
US8875976B2 (en) 2005-09-26 2014-11-04 Aeroprobe Corporation System for continuous feeding of filler material for friction stir welding, processing and fabrication
US9266191B2 (en) 2013-12-18 2016-02-23 Aeroprobe Corporation Fabrication of monolithic stiffening ribs on metallic sheets
US9511445B2 (en) 2014-12-17 2016-12-06 Aeroprobe Corporation Solid state joining using additive friction stir processing
US9511446B2 (en) 2014-12-17 2016-12-06 Aeroprobe Corporation In-situ interlocking of metals using additive friction stir processing

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4318136A1 (de) * 1993-06-01 1994-12-08 Badische Maschf Gmbh Verfahren zum Regenerieren von Gießerei-Altsanden
DE10025815C2 (de) * 2000-05-24 2002-08-01 Cyrus Gmbh Schwingtechnik Vorrichtung zur Wiedergewinnung von Sand
US8397974B2 (en) * 2005-09-26 2013-03-19 Aeroprobe Corporation Self-reacting friction stir welding tool with the ability to add filler material
DE102015006152B4 (de) 2015-05-12 2018-06-07 Mueg Mitteldeutsche Umwelt Und Entsorgung Gmbh Verfahren zur Aufbereitung und Wiederverwendung von Gießereialtsanden
CA3081330A1 (fr) 2017-10-31 2019-05-09 MELD Manufacturing Corporation Systeme de fabrication additive a l'etat solide et compositions et structures de materiau

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1195226A (en) * 1966-08-04 1970-06-17 British Cast Iron Res Ass Reclamation of Moulding Sand
DE3309379A1 (de) * 1983-03-16 1984-09-20 Hubert Eirich Verfahren zur regenerierung von giessereialtsand und vorrichtung zur durchfuehrung des verfahrens
DE3873522D1 (de) * 1988-05-26 1992-09-10 Pohl Giessereitechnik Verfahren und vorrichtung zum regenieren von giessereialtsanden.
CH682986A5 (de) * 1990-03-08 1993-12-31 Fischer Ag Georg Verfahren zur chargenweisen Regenerierbehandlung von überwiegend tongebundenem Giesserei-Altsand.
DE4111726C2 (de) * 1991-04-10 1994-02-24 Kgt Giessereitechnik Gmbh Verfahren zur mechanischen Reinigung von Gießereialtsand

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8632850B2 (en) 2005-09-26 2014-01-21 Schultz-Creehan Holdings, Inc. Friction fabrication tools
US8636194B2 (en) 2005-09-26 2014-01-28 Schultz-Creehan Holdings, Inc. Friction stir fabrication
US8875976B2 (en) 2005-09-26 2014-11-04 Aeroprobe Corporation System for continuous feeding of filler material for friction stir welding, processing and fabrication
US8893954B2 (en) 2005-09-26 2014-11-25 Aeroprobe Corporation Friction stir fabrication
US9205578B2 (en) 2005-09-26 2015-12-08 Aeroprobe Corporation Fabrication tools for exerting normal forces on feedstock
US9266191B2 (en) 2013-12-18 2016-02-23 Aeroprobe Corporation Fabrication of monolithic stiffening ribs on metallic sheets
US9511445B2 (en) 2014-12-17 2016-12-06 Aeroprobe Corporation Solid state joining using additive friction stir processing
US9511446B2 (en) 2014-12-17 2016-12-06 Aeroprobe Corporation In-situ interlocking of metals using additive friction stir processing

Also Published As

Publication number Publication date
DE59306964D1 (de) 1997-08-28
DE4237838A1 (de) 1994-05-11
EP0597335A1 (fr) 1994-05-18

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