EP0129210A2 - Machine pour compacter du matériau de moulage de fonderie - Google Patents

Machine pour compacter du matériau de moulage de fonderie Download PDF

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Publication number
EP0129210A2
EP0129210A2 EP84106795A EP84106795A EP0129210A2 EP 0129210 A2 EP0129210 A2 EP 0129210A2 EP 84106795 A EP84106795 A EP 84106795A EP 84106795 A EP84106795 A EP 84106795A EP 0129210 A2 EP0129210 A2 EP 0129210A2
Authority
EP
European Patent Office
Prior art keywords
valve plate
pressure vessel
opening
molding
plate
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
EP84106795A
Other languages
German (de)
English (en)
Other versions
EP0129210B1 (fr
EP0129210A3 (en
Inventor
Günter Müller
Norbert Damm
Günter Kuppinger
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 EP0129210A2 publication Critical patent/EP0129210A2/fr
Publication of EP0129210A3 publication Critical patent/EP0129210A3/de
Application granted granted Critical
Publication of EP0129210B1 publication Critical patent/EP0129210B1/fr
Expired 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

Definitions

  • the invention relates to a device for compressing foundry molding material by means of pressurized gas, consisting of a pressure vessel for the pressurized gas forming a pre-pressure chamber, a mold chamber arranged below it from a mold box with filling frame and a model plate with a model that closes the mold box below, onto which the molding material is compressed is loosely heaped up, and a valve arranged between the pressure vessel and the mold space, the closure member of which releases the opening cross-section of the valve predominantly under the effect of the pressure in the pressure vessel.
  • a device of the aforementioned structure is the subject of earlier patent application No. 82 11 0996.4.
  • compressed gas e.g. Compressed air or compressed gas generated by explosive combustion
  • the compressed gas is suddenly released from a pressure vessel into the mold space, thereby acting on the free molding material surface and compressing the molding material particles with mutual impulse exchange and by delaying the accelerated molding material mass on the model top and the model plate , with additional fluidization effects occurring while reducing particle friction.
  • compressed gas e.g. Compressed air or compressed gas generated by explosive combustion
  • the older patent application describes some embodiments of valve constructions that meet these requirements.
  • the compressed gas itself is used to initiate at least the opening stroke of the valve and thus one as quickly as possible
  • To achieve pressure equalization on both sides of the closure member so that any further opening movement does not have to be carried out against the pressure.
  • the closure member is arranged so that it is substantially moved into the pressure vessel. This in turn requires a special structure of the closure member.
  • the present invention is based on the object of proposing improved embodiments in which the opening cross section is released solely under the action of the compressed gas.
  • closure member is guided within the pressure vessel and its opening movement is at least largely directed into the mold space.
  • closure member is a valve plate provided with a plurality of openings, preferably slots, which interacts with a fixed plate arranged above it and between the pressure vessel and the mold space and having a multiplicity of openings, the openings of the valve plates and the fixed plate being offset relative to one another to form a tight seal, and that the valve plate is fixed in the closed position and after the fixing has been released can be accelerated into the mold space by means of the compressed gas.
  • the valve plate and the stationary plate are each designed in the manner of a grate, the openings of both plates not overlapping in the closed position. So the openings of the fixed plate are closed by the valve plate and their holes by the fixed plate. As soon as the valve plate is lowered even by a small amount, the compressed gas can flow into the molding space through the large number of openings in the stationary plate and the valve plate. This has the advantage that for the expansion of the compressed gas into the mold space, the closure member only has to carry out a very small stroke in order to release the largest possible overflow cross section.
  • the valve plate advantageously has a rectangular cross section which is adapted to the rectangular cross section of the molding space, in order also to achieve the largest possible opening cross section and a uniform distribution of the compressed gas over the molding material surface.
  • the valve plate or the stationary plate are provided with a sealing strip surrounding all openings on the surfaces facing each other.
  • This sealing layer is preferably seated on the valve plate.
  • the closure member is designed as a thin valve plate made of a flexible material, which covers an opening between the pressure vessel and the molding space, is tightly fixed at the edges in the closed position and after releasing the fixation under the effect of the compressed gas towards the center and down in the mold space is displaced.
  • This valve plate can for example consist of rubber, rubber-elastic plastic or a plastic with a different elasticity behavior, it is only important that the cross-section and material are selected so that the valve plate is folded into the mold space as quickly as possible after the release of the pressure gas and while doing so as much as possible ichen cross section of the opening.
  • the opening movement is carried out exclusively under the action of the compressed gas if the edge fixing of the valve plate is released.
  • This embodiment gives the possibility that the opening between the pressure vessel and the mold space corresponds to the free cross-section of the mold space, the valve plate being arranged in the closed position in the pressure vessel and resting on the edge of the bottom thereof delimiting the opening. Due to the large opening cross-section that is possible as a result, and its sudden release by folding down the valve plate, the desired gas mass throughput and the rapid increase in pressure in the molding space can be achieved in a particularly simple manner.
  • the flexible valve plate can be held in the closed position by means of a ring or frame, which acts on its peripheral edge from above and to which the fixation is assigned.
  • This ring or frame which is also under the action of the compressed gas, presses the edge of the Ven tilplatte against the opening of the bottom of the pressure vessel.
  • This ring or frame can have a relatively small mass, so that it can also be lifted off with a low driving force in order to initiate the opening movement of the valve plate.
  • the material of the valve plate has a resilience which brings it into a position approximately corresponding to its closed position.
  • the valve plate which is displaced into the mold space due to its flexibility during the opening movement, straightens itself up after the pressure equalization has been reached and reaches a position in which it is again located within the pressure container and pressed against the edges again by means of a closing drive which acts on the ring or frame can be.
  • valve plate is arranged on a central guide rod, by means of which it can be brought from the open position into the closed position, and which can be fixed in the closed position of the valve plate by means of a clamping device forming the fixation.
  • the valve plate is thus brought from the open position into the closed position by means of the guide rod. Then the guide rod is fixed by means of the clamping device so that the pressure vessel can be filled with the compressed gas. By releasing the clamping device, the valve plate is released and is suddenly accelerated into the open position by the pressure gas applied to it. Due to its radial action on the guide rod, the clamping device provided according to the invention has the advantage that only very short distances are required for loosening are necessary so that this process can also take place in the shortest possible time.
  • a pressure medium cylinder acting on the guide rod can serve as the closing drive for the closure member, and is decoupled from the guide rod after the guide rod has been fixed by means of the clamping device, at least at the beginning of the opening movement.
  • the drive connection is then re-established and the valve plate is brought back into the closed position by means of the guide rod.
  • valve plate is formed from a flexible material
  • the ring or frame pressing the valve plate on the edge sits on the lower part of a two-part guide rod, which is guided so as to be axially displaceable relative to the upper part.
  • the ring or frame is provided with spring brackets which are supported at the opening edge and are pretensioned during the closing movement, while after loosening the clamping device they accelerate the ring or frame with the lower part of the guide rod upwards, releasing the valve plate edge. Under the action of the compressed gas, the valve plate pulls out of the gap between the ring or frame on the one hand and the bottom of the pressure vessel delimiting the opening on the other and folds into the mold space.
  • a pressure vessel 5 - in the embodiment shown for receiving compressed air - which is connected via a connection 6 from a pressure accumulator or - at low admission pressure - is fed from the company's compressed air network.
  • the pressure vessel has a stationary plate as the bottom 7, which is provided with a plurality of slots 8 in a rust-like manner in the area above the molding space.
  • a frame 9 is flanged to the underside of the base 7, to which in turn an exhaust air line with a valve 10 is connected.
  • the pressure vessel 5 with the frame 9 on the one hand and the model plate 1 with model 2, molding box 3 and filling frame 4 can be moved relative to one another in order to be able to fill the molding space with molding material. Before compression, these two assemblies are brought together and pressed tightly together at their interface.
  • the valve plate 11 is seated on a guide rod 14 which can be lifted from the open position of the valve plate shown on the right into the closed position shown on the left by means of a sliding piston 15 sliding thereon.
  • the upper end face of the lifting piston 15 acts against this crosshead 18 during its upward movement.
  • the guide rod 14 is assigned a clamping device, designated as a whole by 19, of which one clamping part 20 is axially movable within a housing 21 supported on the floor and the other clamping part 22 sits on the guide rod.
  • the clamping parts can be wedges or the like.
  • the support body 23 on the floor 7, which delimits an overflow space 24 between it and the floor 7.
  • the support body has circumferentially coaxial slots 25, which are rotated on the outside by a rotatable ring 26, which in turn has slots 27.
  • the clamping device 19 is in the clamping position, so that the valve plate 11 is pressed tightly against the bottom 7. Molding box 3 and filling frame 4 are loosely filled with molding sand.
  • the ring 26 is first rotated in such a way that its slots 27 come into coincidence with the slots 25 of the supporting body 23 (see right half of the illustration), so that the compressed gas can reach the overflow chamber 24.
  • a mechanical safety latch 28 is subsequently extended and the reciprocating piston 15 is lowered when the clamping device 19 is blocked, and it slides down on the guide rod 14. Then the clamping device 19 is released hydraulically and the guide rod 14 and the valve plate 11 are released.
  • the pressure gas present via the slots 8 on the valve plate 11 suddenly accelerates it downward, so that the pressure gas can relax in the molding space via the slots 12 and over the edge region.
  • the guide rod 14 is braked when the crosshead 18 strikes the damper 17.
  • the valve plate reaches the position shown on the right.
  • the molding sand is accelerated and at the same time braked on model plate 1 and model 2 and compacted in the process.
  • the ring 26 is rotated again to secure it, so that a new filling process can begin without the compressed gas being able to overflow.
  • the gas mass throughput can be preset and the shape hardness can thereby be determined.
  • the guide rod 24 with the valve plate 11 is then raised again via the crosshead 18 and fixed in the closed position (I inke half of the illustration) by means of the clamping device.
  • the safety latch 28 is retracted. During this process, the compressed gas still present in the molding space is blown off via the valve 10.
  • the bottom 7 of the pressure vessel 5 is provided with an opening 29 which corresponds approximately to the inside width of the filling frame, that is to say is rectangular or has the largest possible circular opening 29.
  • This opening 29 is overlapped by a flexible valve plate 30, which is clamped in its center on the lower part 14 'of the two-part guide rod 14 here. In the closed position, the valve plate 30 runs approximately horizontally and. is pressed with its edge 31 by means of a ring or frame 32 sealingly against the bottom 7 of the pressure vessel 5 delimiting the opening.
  • the ring or frame 32 is also seated on the lower part 14 'of the guide rod 14 and is axially displaceable therewith, the axial stroke being limited by dampers 33 which are fastened to the upper part 14 "of the guide rod 14.
  • the guide rod 1 associated with a clamping device 19.
  • the guide rod 14 has a lifting drive 34, which has the same function as the lifting piston 15 according to FIG of the ring 32 on the valve plate edge 31 or the base 7, which extends down to the spring and engages the bolt 36, which is supported on the base 7 of the pressure vessel 5.
  • the part 14 'of the guide rod 14 is in its lower position.
  • the valve plate 30 is pressed tightly against the bottom 7 in the region of its edge 31 by means of the ring 32.
  • the spring accumulators 35 are preloaded.
  • the guide rod 14 is fixed by means of the clamping device 79. To initiate the opening movement, first the clamping device and thereby the spring accumulator 35 are released, so that the ring or frame 32 suddenly lifts upwards and runs against the damper 33. At the same time, the entire guide rod 14 is raised by means of the lifting drive 34. Under the action of the compressed gas present on the valve plate 30, the latter can pull out between the ring 32 and the base 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP84106795A 1983-06-15 1984-06-14 Machine pour compacter du matériau de moulage de fonderie Expired EP0129210B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3321622A DE3321622A1 (de) 1983-06-15 1983-06-15 Vorrichtung zum verdichten von giesserei-formstoff
DE3321622 1983-06-15

Publications (3)

Publication Number Publication Date
EP0129210A2 true EP0129210A2 (fr) 1984-12-27
EP0129210A3 EP0129210A3 (en) 1985-05-15
EP0129210B1 EP0129210B1 (fr) 1988-05-18

Family

ID=6201577

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84106795A Expired EP0129210B1 (fr) 1983-06-15 1984-06-14 Machine pour compacter du matériau de moulage de fonderie

Country Status (7)

Country Link
US (1) US4620585A (fr)
EP (1) EP0129210B1 (fr)
JP (1) JPS6012253A (fr)
DD (1) DD224248A5 (fr)
DE (2) DE3321622A1 (fr)
PL (1) PL248185A3 (fr)
YU (1) YU102484A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0203322A1 (fr) * 1985-05-25 1986-12-03 BMD Badische Maschinenfabrik Durlach GmbH Dispositif pour compacter un matériau de moulage de fonderie à l'aide d'un gaz de compression
EP0131723B1 (fr) * 1983-06-18 1987-08-12 BMD Badische Maschinenfabrik Durlach GmbH Dispositif pour le serrage de matière de moulage de fonderie à l'aide de gaz comprimé

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH665971A5 (de) * 1983-11-30 1988-06-30 Fischer Ag Georg Einrichtung zum verdichten von koernigen formstoffen.
DE3725177C2 (de) * 1986-08-12 1997-02-13 Arana Erana Agustin Schießkopf für eine Gießkernschießmaschine
ES2006861A6 (es) * 1988-03-21 1989-05-16 Lopez Foronda Fernandez Vicent Mejoras introducidas en campanas de aire para moldeo por onda expansiva.

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1961234C3 (de) * 1969-12-05 1975-02-06 Kramatorskij Nautschno-Issledowatel' Skij I Projektno-Technologitscheskij Institut Maschinostrojenija, Kramatorsk (Sowjetunion) Verfahren und Vorrichtung zum Verdichten von GieBereiformmassen
SU425719A1 (fr) * 1972-07-17 1974-04-30 институт машиностроени
SU521993A1 (ru) * 1974-04-02 1976-07-25 Краматорский Научно-Исследовательский И Проектно-Технологический Институт Машиностроения Импульсна головка
SU818727A1 (ru) * 1979-03-05 1981-05-06 Краматорский Научно-Исследовательскийи Проектно-Технологический Институтмашиностроения Импульсна головка
SU793696A1 (ru) * 1979-03-19 1981-01-07 Краматорский Научно-Исследовательскийи Проектно-Технологический Институтмашиностроения Импульсна головка
CH642288A5 (de) * 1980-02-18 1984-04-13 Fischer Ag Georg Verfahren und einrichtung zum verdichten von formstoff, insbesondere fuer giessformen.
DE3238712A1 (de) * 1982-10-19 1984-04-19 Heinrich Wagner Maschinenfabrik GmbH & Co, 5928 Laasphe Vorrichtung zum verdichten von formmasse in einer form, insbesondere in einer giessereiform

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0131723B1 (fr) * 1983-06-18 1987-08-12 BMD Badische Maschinenfabrik Durlach GmbH Dispositif pour le serrage de matière de moulage de fonderie à l'aide de gaz comprimé
EP0203322A1 (fr) * 1985-05-25 1986-12-03 BMD Badische Maschinenfabrik Durlach GmbH Dispositif pour compacter un matériau de moulage de fonderie à l'aide d'un gaz de compression

Also Published As

Publication number Publication date
DE3321622A1 (de) 1984-12-20
YU102484A (en) 1988-10-31
PL248185A3 (en) 1985-04-09
US4620585A (en) 1986-11-04
JPS6012253A (ja) 1985-01-22
DD224248A5 (de) 1985-07-03
EP0129210B1 (fr) 1988-05-18
DE3471268D1 (en) 1988-06-23
DE3321622C2 (fr) 1988-12-15
EP0129210A3 (en) 1985-05-15

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