EP0131723A1 - 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

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Publication number
EP0131723A1
EP0131723A1 EP84106120A EP84106120A EP0131723A1 EP 0131723 A1 EP0131723 A1 EP 0131723A1 EP 84106120 A EP84106120 A EP 84106120A EP 84106120 A EP84106120 A EP 84106120A EP 0131723 A1 EP0131723 A1 EP 0131723A1
Authority
EP
European Patent Office
Prior art keywords
valve
control
opening
section
cross
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
EP84106120A
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German (de)
English (en)
Other versions
EP0131723B1 (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.)
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 EP0131723A1 publication Critical patent/EP0131723A1/fr
Application granted granted Critical
Publication of EP0131723B1 publication Critical patent/EP0131723B1/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 compressed gas, consisting of a pressure vessel forming a pre-pressure chamber for the compressed 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 placed before Compression is loosely heaped, and a valve with a large opening cross-section arranged between the pre-pressure space and the molding space, the closure member of which opens in the range of milliseconds.
  • 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 rise in pressure over time, require not only a quick-opening valve, but also a correspondingly large free cross-section. These demands for a large valve cross section and abrupt valve opening can in turn only be met 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.
  • the invention has for its object to develop a device of the structure described above, as is the subject of patent application P 32 43 951, 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 mold 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 takes a different route by assigning a further control valve to the valve, the control cross-sections of which can be preset, so that with a given admission pressure the Gas mass flow rate is regulated by the control valve.
  • 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 - for a given mold hardness - the molding material, even if the mold box is large is sufficiently compressed.
  • 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 so that it only comes into the open position when the compression valve has already reached its closing position.
  • 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 pre-pressure chamber 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 illustrated embodiment for receiving compressed air - which is connected via a connection 6 from a pressure accumulator or - at low Form - 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 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 whose other clamping part 22 is seated 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 runs along the outer delimitation of the compression valve 8, 11, 12 starts.
  • 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 element can be formed from displaceable plates or a ring or from 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-hand 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 safeguarding, 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 28 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)
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
DE19833321955 DE3321955A1 (de) 1983-06-18 1983-06-18 Vorrichtung zum verdichten von giesserei-formstoff mittels druckgas
DE3321955 1983-06-18

Publications (2)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0152573B1 (fr) * 1983-12-09 1988-04-27 BMD Badische Maschinenfabrik Durlach GmbH Dispositif pour compacter du matériau de moulage de fonderie à l'aide d'un gaz de compression
CN109848373A (zh) * 2019-04-01 2019-06-07 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

Families Citing this family (3)

* 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
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

Citations (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
EP0089547A1 (fr) * 1982-03-23 1983-09-28 BMD Badische Maschinenfabrik Durlach GmbH Procédé et dispositif pour compacter du sable de moulage de fonderie
DE3319496A1 (de) * 1982-06-29 1983-12-29 VEB Kombinat Gießereianlagenbau und Gußerzeugnisse - GISAG -, DDR 7031 Leipzig Vorrichtung zum verdichten von giessereiformstoffen mittels druckimpulsen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3321622A1 (de) * 1983-06-15 1984-12-20 BMD Badische Maschinenfabrik Durlach GmbH, 7500 Karlsruhe Vorrichtung zum verdichten von giesserei-formstoff

Patent Citations (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
EP0089547A1 (fr) * 1982-03-23 1983-09-28 BMD Badische Maschinenfabrik Durlach GmbH Procédé et dispositif pour compacter du sable de moulage de fonderie
DE3319496A1 (de) * 1982-06-29 1983-12-29 VEB Kombinat Gießereianlagenbau und Gußerzeugnisse - GISAG -, DDR 7031 Leipzig Vorrichtung zum verdichten von giessereiformstoffen mittels druckimpulsen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0152573B1 (fr) * 1983-12-09 1988-04-27 BMD Badische Maschinenfabrik Durlach GmbH Dispositif pour compacter du matériau de moulage de fonderie à l'aide d'un gaz de compression
CN109848373A (zh) * 2019-04-01 2019-06-07 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
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

Also Published As

Publication number Publication date
EP0131723B1 (fr) 1987-08-12
DE3321955C2 (fr) 1989-06-29
DE3321955A1 (de) 1984-12-20
DD218847A5 (de) 1985-02-20
JPS6012254A (ja) 1985-01-22
YU105484A (en) 1987-12-31

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