EP0129210B1 - Vorrichtung zum Verdichten von Giesserei-Formstoff - Google Patents

Vorrichtung zum Verdichten von Giesserei-Formstoff Download PDF

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Publication number
EP0129210B1
EP0129210B1 EP84106795A EP84106795A EP0129210B1 EP 0129210 B1 EP0129210 B1 EP 0129210B1 EP 84106795 A EP84106795 A EP 84106795A EP 84106795 A EP84106795 A EP 84106795A EP 0129210 B1 EP0129210 B1 EP 0129210B1
Authority
EP
European Patent Office
Prior art keywords
valve plate
fact
pressure vessel
accordance
moulding
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
Application number
EP84106795A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0129210A3 (en
EP0129210A2 (de
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.)
BMD Badische Maschinenfabrik Durlach GmbH
Original Assignee
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 BMD Badische Maschinenfabrik Durlach GmbH filed Critical BMD Badische Maschinenfabrik Durlach GmbH
Publication of EP0129210A2 publication Critical patent/EP0129210A2/de
Publication of EP0129210A3 publication Critical patent/EP0129210A3/de
Application granted granted Critical
Publication of EP0129210B1 publication Critical patent/EP0129210B1/de
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 compressed gas, consisting of a pressure vessel forming a pre-pressure chamber for the compressed gas, a molding space arranged underneath from a molding box with a filling frame and a model plate with a model that closes the molding box below, onto which the molding material is compressed is loosely heaped up, and a valve arranged between the pressure vessel and the molding space, the closure member of which suddenly releases the opening cross-section of the valve primarily under the effect of the pressure in the pressure vessel and its opening movement is at least largely directed into the molding space.
  • Such a device is known from SU-1 006 042-A.
  • the closure member is slidably guided in upwardly projecting guide bolts in holes in the bottom plate of the pressure vessel.
  • the locking device is locked electromagnetically, the components of this electromagnetic locking device being arranged both in the locking device and in the base plate.
  • the movement of the closure member from the open position into the closed position is carried out by compression springs which are arranged on the aforementioned guide bolts and load the closure member in the closing direction.
  • the present invention is based on the object, using the pressure gradient between the pressure vessel and the mold space, to propose improved embodiments for opening the closure member, in which, in particular, rapid valve opening is ensured.
  • closure member is guided inside the pressure container 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 closure member by means of a clamping device which fixes it.
  • a preferred embodiment of the invention is that the closure member is a valve plate provided with a plurality of openings, preferably slots, which cooperates with a fixed plate arranged above it and between the pressure vessel and the mold space and having a plurality of openings, the openings of the valve plate and stationary plate are offset from one another to form a tight seal and that the valve plate is fixed in the closed position by means of the clamping device and can be accelerated into the mold space by releasing the clamping device by means of the compressed gas.
  • the valve plate and the stationary plate can thus each be designed in the manner of a grate with mutually offset openings.
  • the valve plate advantageously has a rectangular cross section which is adapted to the rectangular cross section of the molding space, in order to achieve the largest possible opening cross section and a uniform distribution of the compressed gas over the surface of the molding material.
  • valve plate and the stationary plate are provided with a sealing covering surrounding all openings on the surfaces facing each other.
  • This sealing covering 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 in the edge position in the closing position and after loosening the clamping device 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 also 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 thereby the largest possible Cross section of the opening releases.
  • 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. Because of the large opening cross-section that is possible as a result and its sudden release by folding down the valve plate, the desired one can be obtained Achieve gas mass flow rate and the rapid increase in pressure in the mold space 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 clamping device is assigned.
  • This ring or frame which is also under the action of the compressed gas, presses the edge of the valve plate against the bottom of the pressure vessel delimiting the opening.
  • This ring or frame has a relatively low mass, so that it can 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 in turn located within the pressure container and pressed against the edge again by means of a closing drive which acts on the ring or frame can be.
  • 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 made of 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 axially displaceably guided relative to the upper part.
  • the ring or frame is provided with spring brackets which are supported on 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 raised 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, generally designated 19, the one clamping part 20 of which is located within an am Floor supported housing 21 is axially movable and the other clamping part 22 is seated 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 pressure vessel 5 is filled with compressed gas via the connection 6.
  • 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. Subsequently, a mechanical safety latch 25 is extended and the reciprocating piston 15 is lowered when the clamping device 19 is blocked, whereby it slides down on the guide rod 14.
  • the clamping device 19 is released hydraulically and the guide rod 14 and the valve plate 11 are released.
  • the pressure gas present on the slots 5 on the valve plate 11 accelerates it suddenly downward, so that the pressure gas can relax in the molding space via the slots 12 and over the edge area.
  • the guide rod 14 is braked when the crosshead 15 strikes the damper 17.
  • the valve plate reaches the position shown in the illustration 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 15 and fixed in the closed position (left half of the illustration) by means of the clamping device.
  • the safety latch 25 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.
  • the valve plate 30 In the closed position, the valve plate 30 extends approximately horizontally and is pressed with its edge 31 by means of a ring or frame 32 in a sealing manner against the bottom 7 of the pressure container 5 which delimits 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 Pressing the ring 32 against the valve plate edge 31 or the bottom 7.
  • they have a downwardly extending bolt 36 which acts on the spring and which is supported on the bottom 7 of the pressure container 5.
  • the part 14 'of the guide rod 14 is in its lower position.
  • the valve plate 30 is pressed close to 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 19.
  • the valve plate straightens up again and, due to its resilience, comes into contact with the ring 32 (see upper position of the valve plate in the right-hand illustration in FIG. 2). Then the guide rod 14 moves down together with the ring 32 until the bolts 36 of the spring accumulator 35 hit the floor 7 and are prestressed in the process. Finally, the ring 32 in turn clamps the edge 31 of the valve plate 30 tightly against the bottom 7. The upper part 14 " the guide rod is raised again somewhat by means of the lifting drive, so that the ring or frame 32 again has the necessary play with respect to the dampers 33.

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 Vorrichtung zum Verdichten von Giesserei-Formstoff Expired EP0129210B1 (de)

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 EP0129210A2 (de) 1984-12-27
EP0129210A3 EP0129210A3 (en) 1985-05-15
EP0129210B1 true EP0129210B1 (de) 1988-05-18

Family

ID=6201577

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84106795A Expired EP0129210B1 (de) 1983-06-15 1984-06-14 Vorrichtung zum Verdichten von Giesserei-Formstoff

Country Status (7)

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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3321955A1 (de) * 1983-06-18 1984-12-20 BMD Badische Maschinenfabrik Durlach GmbH, 7500 Karlsruhe Vorrichtung zum verdichten von giesserei-formstoff mittels druckgas
CH665971A5 (de) * 1983-11-30 1988-06-30 Fischer Ag Georg Einrichtung zum verdichten von koernigen formstoffen.
DE3518980A1 (de) * 1985-05-25 1986-11-27 BMD Badische Maschinenfabrik Durlach GmbH, 7500 Karlsruhe Vorrichtung zum verdichten von giesserei-formstoff mittels druckgas
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 (enrdf_load_stackoverflow) * 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

Also Published As

Publication number Publication date
DE3321622A1 (de) 1984-12-20
EP0129210A3 (en) 1985-05-15
EP0129210A2 (de) 1984-12-27
PL248185A3 (en) 1985-04-09
DD224248A5 (de) 1985-07-03
US4620585A (en) 1986-11-04
JPS6012253A (ja) 1985-01-22
YU102484A (en) 1988-10-31
DE3321622C2 (enrdf_load_stackoverflow) 1988-12-15
DE3471268D1 (en) 1988-06-23

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