EP0131723B1 - Dispositif pour le serrage de matière de moulage de fonderie à l'aide de gaz comprimé - Google Patents

Dispositif pour le serrage de matière de moulage de fonderie à l'aide de gaz comprimé Download PDF

Info

Publication number
EP0131723B1
EP0131723B1 EP84106120A EP84106120A EP0131723B1 EP 0131723 B1 EP0131723 B1 EP 0131723B1 EP 84106120 A EP84106120 A EP 84106120A EP 84106120 A EP84106120 A EP 84106120A EP 0131723 B1 EP0131723 B1 EP 0131723B1
Authority
EP
European Patent Office
Prior art keywords
valve
control
opening
section
valve opening
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
EP84106120A
Other languages
German (de)
English (en)
Other versions
EP0131723A1 (fr
Inventor
Norbert Damm
Günter Müller
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 EP0131723A1 publication Critical patent/EP0131723A1/fr
Application granted granted Critical
Publication of EP0131723B1 publication Critical patent/EP0131723B1/fr
Expired legal-status Critical Current

Links

Images

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 forming a pre-pressure chamber for the pressurized gas, a molding space arranged underneath, consisting of a molding box, filling frame and a model plate with a model that closes the molding box below, on which the molding material is compressed prior to compression is loosely heaped up, and a valve with a large opening cross section arranged between the pre-pressure space and the molding space, the closure opening of which opens in the range of milliseconds.
  • a high pressure gradient that is, a rapid build-up of pressure in the molding space, initially depends on the outlet pressure in the upstream pressure space. The higher this is, the sooner a high pressure gradient can be achieved, but the greater the structural effort to produce this form.
  • a representative high pre-pressure such as in company compressed air networks
  • a high pressure ingredient can only be achieved by opening the valve between the pressure vessel and the mold in a few milliseconds. This alone requires special valve designs, as described in some embodiments in patent application P 32 43 951.
  • the gas mass acting on the free molding material surface which must be in a certain ratio to the molding material mass.
  • the gas mass throughput must be more than 50 kg / s.
  • the temporal pressure increase in the molding space should be more than 300 bar / s with a final pressure of up to approx. 8 bar.
  • the required gas mass throughput, as well as the increase in pressure over time, require not only a quick-opening valve, but also a correspondingly large and sudden valve opening can in turn only be achieved if, despite the necessarily large closure member, its mass is kept as low as possible. This in turn means that the pressure gradient and the gas mass throughput can essentially only be controlled by the level of the admission pressure.
  • a device of the type mentioned is known.
  • a ring slide is arranged in front of the closure member, which is used on the one hand to close the pressure chamber after the opening stroke of the closure member, in order to be able to fill the pressure chamber again with compressed gas immediately after opening the closure member, and on the other hand it is provided for presetting the gas mass flow rate.
  • the invention has for its object to develop a device of the structure described above in such a way that the mold hardness is adjustable within wide limits.
  • the compression valve is associated with a control valve, the free opening cross-section is larger than the free cross-section of the valve opening, and which can be adjusted to a predetermined control cross-section by means of a control element before the opening movement of the closing member begins.
  • the control valve is preferably arranged between the upstream pressure chamber and the compression valve, but it can also be connected downstream of the latter.
  • valve between the compressed air tank and the molding space itself as a control valve, that is to say to control the overflow cross sections accordingly, this is practically not possible due to the special requirements mentioned at the outset which are placed on this valve.
  • the invention therefore goes a different way by assigning a further control valve to the valve, the control cross sections of which can be preset, so that the gas mass flow rate can be regulated by the control valve at a given admission pressure.
  • the actual compression valve is not changed.
  • the shape hardness that can be achieved during the relaxation process can thus be set within wide limits.
  • the free opening cross section of the control valve should, if possible, be significantly larger than the free cross section of the compression valve, so that when the control cross section is completely released it is ensured that the maximum mold hardness is achieved or - given the mold hardness - the molding material is sufficiently compressed even with large dimensions of the molding box.
  • control valve can be closed by means of the control member after the opening stroke of the closure member.
  • control valve thus also fulfills a safety function by ensuring that after the compression process and the venting of the molding space and when the molding box is lowered, the compressed gas cannot escape or only in a small amount. This is important because the pressure vessel and valve, on the one hand, and the molding box with filling frame, on the other hand, are separated from one another after the compression stroke in order to remove the compressed mold and to fill the molding box and filling frame again with molding material.
  • the control member can in turn be controlled in such a way that it only reaches the open position when the compression valve has already reached its closed position.
  • control valve is designed as a lifting bell, which engages over the compression valve and whose stroke can be preset.
  • an overflow space for the compressed gas is arranged above the valve opening, which is only open to the valve opening and is connected to the admission pressure space via the control valve.
  • the overflow space serves to transfer the compressed gas from the upstream pressure space of the pressure vessel to the valve opening.
  • the overflow space can have a wall which extends vertically upwards and surrounds the valve opening and in which a plurality of openings forming the free cross section of the control valve are provided, the control member being guided on the wall and provided with a corresponding number of openings.
  • This embodiment gives in particular the possibility of arranging the drive for the compression valve within the pressure container.
  • the openings in the vertical wall of the overflow space and in the control member are preferably designed as vertical control slots, the degree of coverage of which determines the gas mass throughput.
  • control slots are arranged on at least two walls of the overflow space that each rise above a rectangular side, and the control member is designed as a displaceable slot plate.
  • the vertical wall of the overflow space can also surround the valve opening in a circle and be provided with control slots at a uniform distance, the control member being designed as a rotatable slot ring.
  • 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 holes 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 an exhaust air line with a valve 10 is in turn 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 together tightly at their interface.
  • the valve plate 11 is seated on a guide rod 14, which by means of a reciprocating piston 15 sliding on it from the right reproduced opening position of the valve plate can be raised into the closed position shown on the left.
  • 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.
  • a presettable control valve is assigned to the compression valve described above, and in this case it is arranged in front of the compression valve because its closure member opens into the molding space.
  • the overflow space is delimited on the circumference by a vertical wall 29 which attaches along the outer boundary of the compression valve 8, 11, 12.
  • the wall can be circular or rectangular and it has coaxial control slots 25, which are overlapped on the outside by a control member 26, which also has slots 27.
  • the control member can be formed from slidable plates or a ring or ring parts.
  • the guide rod 14 is braked when the crosshead 18 strikes the damper 17.
  • the valve plate 11 reaches the position shown in the right illustration.
  • the molding sand is accelerated and at the same time braked on model plate 1 and model 2 and compacted in the process.
  • the control member 26 is brought back into the closed position for protection, so that a new filling process can begin without the compressed gas being able to overflow.
  • the guide rod 14 with the valve plate 11 is then raised again via the crosshead 18 and fixed in the closed position (left half of the illustration) by means of the clamping device.
  • the safety latch 26 is retracted. During this process, the compressed gas still present in the molding space is blown off via the valve 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)

Claims (9)

1. Dispositif pour la compression d'une matière à mouler de fonderie au moyen d'un gaz sous pression, ce dispositif comprenant un récipient à pression (5) pour le gaz comprimé, ce récipient formant un espace de précompression, un espace de moulage disposé en dessous de ce récipient et constitué d'un châssis de moulage (3), d'une hausse (4) et d'une plaque-modéle (1) fermant le châssis de moulage (3) dans le bas et comportant un modèle (2) sur lequel la matière à mouler est déposée librement par secousses avant la compression, ainsi qu'une soupape de grande section transversale d'ouverture disposée entre l'espace de précompression et l'espace de moulage, soupape dont l'organe de fermeture s'ouvre dans le domaine des millisecondes et à laquelle est attribuée une soupape de commande (25, 26, 27) dont la section transversale d'ouverture libre est plus grande que la section transversale libre de l'ouverture de soupape (3) et qui peut être réglée à une section transversale de commande déterminée au moyen d'un organe de commande (26) avant le début du mouvement d'ouverture de l'organe de fermeture (11).
2. Dispositif selon la revendication 1, caractérisé en ce que la soupape de commande (25, 26, 27) est disposée entre l'espace de précompression (5) et l'ouverture de soupape (8).
3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que, après la course d'ouverture de l'organe de fermeture (11), la soupape de commande (25, 27) peut être fermée au moyen de l'organe de commande (26).
4. Dispositif selon une des revendications 1 à 3, caractérisé en ce que la soupape de commande (25, 27) est réalisée sous forme d'une cloche de levage qui chevauche la soupape servant à la compression et dont la course peut être préalablement réglée.
5. Dispositif selon une des revendications 1 à 3, caractérisé en ce que, dans le cas d'une ouverture de soupape (8) disposée dans le fond (7) du récipient à pression (5), on installe, au-dessus de cette ouverture, un compartiment de trop-plein (24) pour le gaz sous pression, ce compartiment n'étant ouvert que vers l'ouverture de soupape (8), tandis qu'il est relié au récipient à pression (5) à l'intervention de la soupape de commande (25, 27).
6. Dispositif selon la revendication 5, caractérisé en ce que le compartiment de tropplein (24) comporte une paroi (29) entourant l'ouverture de soupape (8), s'étendant verticalement vers le haut et dans laquelle sont pratiquées plusieurs découpes (25) formant la section transversale libre de la soupape de commande, tandis que l'organe de commande (26) est guidé sur la paroi (29) et est pourvu d'un nombre correspondant de découpes (27).
7. Dispositif selon la revendication 6, caractérisé en ce que les découpes sont réalisées sous forme de fentes verticales de commande (25, 27) dans la paroi verticale (29) du compartiment de trop-plein (24) et dans l'organe de commande (26).
8. Dispositif selon la revendication 5 ou 6, caractérisé en ce que, dans le cas d'une ouverture de soupape (8) essentiellement rectangulaire, on dispose les fentes de commande (25) au moins sur deux parois (29) du compartiment de trop-plein (24) qui s'élèvent chacune au-dessus d'un côté du rectangle, tandis que l'organe de commande (26) est réalisé sous forme d'une plaque a fentes pouvant être déplacée.
9. Dispositif selon la revendication 5 ou 6, caractérisé en ce que la paroi verticale (29) du compartiment de trop-plein (24) entoure circulairement l'ouverture de soupape et comporte des fentes de commande équidistantes (27), tandis que l'organe de commande (26) est réalisé sous forme d'un anneau rotatif fendu.
EP84106120A 1983-06-18 1984-05-29 Dispositif pour le serrage de matière de moulage de fonderie à l'aide de gaz comprimé Expired EP0131723B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3321955 1983-06-18
DE19833321955 DE3321955A1 (de) 1983-06-18 1983-06-18 Vorrichtung zum verdichten von giesserei-formstoff mittels druckgas

Publications (2)

Publication Number Publication Date
EP0131723A1 EP0131723A1 (fr) 1985-01-23
EP0131723B1 true EP0131723B1 (fr) 1987-08-12

Family

ID=6201748

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84106120A Expired EP0131723B1 (fr) 1983-06-18 1984-05-29 Dispositif pour le serrage de matière de moulage de fonderie à l'aide de gaz comprimé

Country Status (5)

Country Link
EP (1) EP0131723B1 (fr)
JP (1) JPS6012254A (fr)
DD (1) DD218847A5 (fr)
DE (1) DE3321955A1 (fr)
YU (1) YU105484A (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4577480A (en) * 1983-06-22 1986-03-25 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Method and apparatus for controlling rolling correction in rolling mill
DE3344520A1 (de) * 1983-12-09 1985-06-20 BMD Badische Maschinenfabrik Durlach GmbH, 7500 Karlsruhe Vorrichtung zum verdichten von giesserei-formstoff mittels druckgas
DE3511283A1 (de) * 1985-03-28 1986-10-09 Dietmar Prof. Dr.-Ing. 5100 Aachen Boenisch Verfahren und vorrichtung zum verdichten von giessereiformstoffen
DE3518980A1 (de) * 1985-05-25 1986-11-27 BMD Badische Maschinenfabrik Durlach GmbH, 7500 Karlsruhe Vorrichtung zum verdichten von giesserei-formstoff mittels druckgas
CN109848373B (zh) * 2019-04-01 2023-09-22 扬州峰明光电新材料有限公司 厚大铸件的复合铸造设备及铸造方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0129210A2 (fr) * 1983-06-15 1984-12-27 BMD Badische Maschinenfabrik Durlach GmbH Machine pour compacter du matériau de moulage de fonderie

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3202395A1 (de) * 1981-01-28 1982-08-26 BMD Badische Maschinenfabrik Durlach GmbH, 7500 Karlsruhe Verfahren und vorrichtung zum pneumatischen verdichten von formsand
DE3243951A1 (de) * 1981-12-28 1983-07-07 BMD Badische Maschinenfabrik Durlach GmbH, 7500 Karlsruhe Verfahren und vorrichtung zum verdichten von giesserei-formstoff
DE3363683D1 (en) * 1982-03-23 1986-07-03 Badische Maschf Gmbh Method and device for compacting foundry moulding sand
DE3319496A1 (de) * 1982-06-29 1983-12-29 VEB Kombinat Gießereianlagenbau und Gußerzeugnisse - GISAG -, DDR 7031 Leipzig Vorrichtung zum verdichten von giessereiformstoffen mittels druckimpulsen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0129210A2 (fr) * 1983-06-15 1984-12-27 BMD Badische Maschinenfabrik Durlach GmbH Machine pour compacter du matériau de moulage de fonderie

Also Published As

Publication number Publication date
YU105484A (en) 1987-12-31
JPS6012254A (ja) 1985-01-22
DE3321955A1 (de) 1984-12-20
DD218847A5 (de) 1985-02-20
DE3321955C2 (fr) 1989-06-29
EP0131723A1 (fr) 1985-01-23

Similar Documents

Publication Publication Date Title
EP0295472B1 (fr) Procédé et dispositif pour le serrage de matière de moulage dans une machine à mouler pour fonderie
DD251300A5 (de) Verfahren und vorrichtung zum verdichten von giessereiformstoffen
DE7602966U1 (de) Giesserei-formmaschine fuer kastenformen
EP0131723B1 (fr) Dispositif pour le serrage de matière de moulage de fonderie à l'aide de gaz comprimé
DE69509866T2 (de) Formmaschine
DE3202395A1 (de) Verfahren und vorrichtung zum pneumatischen verdichten von formsand
EP0089547B1 (fr) Procédé et dispositif pour compacter du sable de moulage de fonderie
DE2933869C2 (de) Verfahren und Vorrichtung zum Herstellen eines unteren Formteils
EP0366902B1 (fr) Procédé et dispositif pour le serrage de matière de moulage de fonderie
DE3319030A1 (de) Vorrichtung zum verdichten von giessereiformsand im gasdruckverfahren
EP0129210B1 (fr) Machine pour compacter du matériau de moulage de fonderie
EP0128336B1 (fr) Dispositif pour le serrage de sable de fonderie
DE3518980C2 (fr)
EP0139119B2 (fr) Procédé et installation pour la compression de matériaux de moulage en forme de grain, par exemple sable de fonderie
DE3344520C2 (fr)
DE2701693C2 (de) Formmaschine zum Herstellen von Gießformen
DE2712489C3 (de) Vorrichtung zum Einfüllen und Verdichten des Formsandes bei der Herstellung von Sandformen für Gießereizwecke
CH646351A5 (de) Verfahren zum herstellen einer giessform und formmaschine zur durchfuehrung des verfahrens.
DE3839475C2 (fr)
DE3719846A1 (de) Verfahren und vorrichtung zum verdichten von formstoff in giesserei-formmaschinen
DE2134494A1 (de) Verfahren zum Herstellen von Sandformen

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): CH FR GB IT LI SE

17P Request for examination filed

Effective date: 19850605

17Q First examination report despatched

Effective date: 19860429

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH FR GB IT LI SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 19870812

Ref country code: FR

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19870812

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19870831

EN Fr: translation not filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19940516

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19940722

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19950529

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19950531

Ref country code: CH

Effective date: 19950531

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19950529

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL