EP0597335A1 - 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
EP0597335A1
EP0597335A1 EP93117552A EP93117552A EP0597335A1 EP 0597335 A1 EP0597335 A1 EP 0597335A1 EP 93117552 A EP93117552 A EP 93117552A EP 93117552 A EP93117552 A EP 93117552A EP 0597335 A1 EP0597335 A1 EP 0597335A1
Authority
EP
European Patent Office
Prior art keywords
sand
processing
mixture
processing container
substances
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.)
Granted
Application number
EP93117552A
Other languages
German (de)
English (en)
Other versions
EP0597335B1 (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
Expired - Lifetime legal-status Critical Current

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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 exposed to a burner flame at the same time or batchwise and is further mechanically loaded by means of mechanical friction and abrasion 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 should be constantly removed with the fluidizing air. 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 area is only subjected to frictional and compressive forces, the sand batch contained in the processing area 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 frictional and abrasive forces between the particles take place, which on the one hand lead to the abrasion of the binder shell, and on the other hand also simultaneously crush the particles of the binder shell, so that in the mixture of substances leaving the friction zone two relatively sharply separated grain spectra, sand particles on the one hand and binder particles on the other hand.
  • 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 process according to the invention that the processing and cleaning stages are separated, so that each is carried out under conditions which are optimal for them that can. 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 substance mixture on 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 outset (EP 0 343 272), which is distinguished according to the invention in that a cleaning chamber for separating sand and binder particles is provided outside the processing container, the cleaning process being carried out in one of the processing container with its feed connecting connecting circuit is arranged.
  • the processing container and the cleaning chamber are in a closed conveyor circuit. After the untreated old sand has been applied to 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 substance mixture 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, e.g. a snail 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, which 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 conveying 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 accumulated in the foundry is collected in a silo 9 and from there pneumatically or mechanically, as indicated by the conveyor 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 and has a plurality of rice arms 16 extending almost 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 old sand runs into the friction zone 19 primarily 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 out of 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
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
DE4237838 1992-11-10
DE4237838A DE4237838A1 (de) 1992-11-10 1992-11-10 Verfahren und Vorrichtung zum Regenerieren von Gießereialtsand

Publications (2)

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

Family

ID=6472470

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93117552A Expired - Lifetime EP0597335B1 (fr) 1992-11-10 1993-10-29 Procédé et appareil pour la régéneration de sable de fonderie usagé

Country Status (2)

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

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013002869A2 (fr) * 2011-04-07 2013-01-03 Schultz-Creehan Holdings, Inc. Système d'alimentation continue en un matériau d'apport destiné à une fabrication par soudage par friction-malaxage et outil à double épaulement de soudage par friction-malaxage
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
US9511446B2 (en) 2014-12-17 2016-12-06 Aeroprobe Corporation In-situ interlocking of metals using additive friction stir processing
US9511445B2 (en) 2014-12-17 2016-12-06 Aeroprobe Corporation Solid state joining using additive friction stir processing
US11311959B2 (en) 2017-10-31 2022-04-26 MELD Manufacturing Corporation Solid-state additive manufacturing system and material compositions and structures

Families Citing this family (3)

* 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
DE102015006152B4 (de) 2015-05-12 2018-06-07 Mueg Mitteldeutsche Umwelt Und Entsorgung Gmbh Verfahren zur Aufbereitung und Wiederverwendung von Gießereialtsanden

Citations (2)

* 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
EP0343272A1 (fr) * 1988-05-26 1989-11-29 Pohl Giessereitechnik Procédé et dispositif pour la régénération de sable décoché de fonderie

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3309379A1 (de) * 1983-03-16 1984-09-20 Hubert Eirich Verfahren zur regenerierung von giessereialtsand und vorrichtung zur durchfuehrung des verfahrens
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

Patent Citations (2)

* 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
EP0343272A1 (fr) * 1988-05-26 1989-11-29 Pohl Giessereitechnik Procédé et dispositif pour la régénération de sable décoché de fonderie

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9643279B2 (en) 2005-09-26 2017-05-09 Aeroprobe Corporation Fabrication tools for exerting normal forces on feedstock
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
US9205578B2 (en) 2005-09-26 2015-12-08 Aeroprobe Corporation Fabrication tools for exerting normal forces on feedstock
WO2013002869A2 (fr) * 2011-04-07 2013-01-03 Schultz-Creehan Holdings, Inc. Système d'alimentation continue en un matériau d'apport destiné à une fabrication par soudage par friction-malaxage et outil à double épaulement de soudage par friction-malaxage
WO2013002869A3 (fr) * 2011-04-07 2013-02-28 Schultz-Creehan Holdings, Inc. Système d'alimentation continue en un matériau d'apport destiné à une fabrication par soudage par friction-malaxage et outil à double épaulement de soudage par friction-malaxage
US9862054B2 (en) 2013-12-18 2018-01-09 Aeroprobe Corporation Additive friction stir methods of repairing substrates
US9266191B2 (en) 2013-12-18 2016-02-23 Aeroprobe Corporation Fabrication of monolithic stiffening ribs on metallic sheets
US10500674B2 (en) 2013-12-18 2019-12-10 MELD Manufacturing Corporation Additive friction-stir fabrication system for forming substrates with ribs
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
US10105790B2 (en) 2014-12-17 2018-10-23 Aeroprobe Corporation Solid state joining using additive friction stir processing
US10583631B2 (en) 2014-12-17 2020-03-10 MELD Manufacturing Corporation In-situ interlocking of metals using additive friction stir processing
US11311959B2 (en) 2017-10-31 2022-04-26 MELD Manufacturing Corporation Solid-state additive manufacturing system and material compositions and structures

Also Published As

Publication number Publication date
DE4237838A1 (de) 1994-05-11
DE59306964D1 (de) 1997-08-28
EP0597335B1 (fr) 1997-07-23

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