EP0170765A1 - Dispositif pour comprimer du matériel de moulage pour fonderies - Google Patents

Dispositif pour comprimer du matériel de moulage pour fonderies Download PDF

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Publication number
EP0170765A1
EP0170765A1 EP85102322A EP85102322A EP0170765A1 EP 0170765 A1 EP0170765 A1 EP 0170765A1 EP 85102322 A EP85102322 A EP 85102322A EP 85102322 A EP85102322 A EP 85102322A EP 0170765 A1 EP0170765 A1 EP 0170765A1
Authority
EP
European Patent Office
Prior art keywords
molding
closure member
valve
pressure vessel
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.)
Granted
Application number
EP85102322A
Other languages
German (de)
English (en)
Other versions
EP0170765B1 (fr
Inventor
Alfons Ing. grad. Köbel
Norbert Ing. Grad. Damm
Werner Geiger
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25798338&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0170765(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Badische Maschinenfabrik GmbH, BMD Badische Maschinenfabrik Durlach GmbH filed Critical Badische Maschinenfabrik GmbH
Publication of EP0170765A1 publication Critical patent/EP0170765A1/fr
Application granted granted Critical
Publication of EP0170765B1 publication Critical patent/EP0170765B1/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, which is loosely heaped up in a closed molding space above a model, by means of compressed gas acting on the molding material surface, which suddenly emerges from a pressure vessel of high pressure via a valve between the latter and the molding space in the latter is relaxed, the molding space being formed from a molding box with a filling frame and a model plate representing the bottom thereof, and the valve has a closure member which releases the opening cross section in a few milliseconds.
  • a large number of mechanical, pneumatic and combined compression methods are known for the compression of foundry molding material, only the pneumatic methods being of interest in connection with the invention. These can essentially be divided into two categories. In the first category, the molding material is placed under gas pressure in an anteroom after opening a valve, it is blown or shot into the mold space together with the air. In any case, this process requires mechanical re-pressing of the molding material in the molding box with significant pressing forces (e.g. DE-AS 28 44 464). In the other category, the molding material is loosely poured onto the model and then suddenly subjected to compressed air from the back of the mold (e.g. DE-AS 28 44 464, DE-AS 1 961 234).
  • the first variant (DE-AS 28 44 464)
  • compressed air up to 7 bar is blown once or several times over a period of between 0.2 and 1 s through openings in a hollow end plate of the molding space, the air flowing through the molding sand should flow out through openings in the model plate.
  • Mechanical repressing is also necessary here, on the one hand to compress the back of the mold, and on the other hand to squeeze out the residual air that is still present in the molding material due to the fluidization effect, the squeezing also being to be supported by a vacuum. This process does not achieve a noticeable reduction in design effort compared to the closing and blowing processes.
  • a molding machine is described (DE-AS 1 961 234), in which a pressure vessel is arranged above the closed molding box or a filling frame arranged above it, which can be connected to the molding space via a mechanically moved valve for mold boxes of customary size, a pre-pressure of 100 bar is proposed in order to achieve a satisfactory compression there after relaxation in the mold space.
  • a high pressure easily leads to irregularities in the surface of the molding material when the compressed gas impinges on the back of the mold, as well as to a considerable design effort in order to generate such high pressures and to achieve the necessary compressive strength in the molding space.
  • the valve of the known device is a poppet valve which is opened by means of a combined pneumatic-mechanical auxiliary drive against the pressure in the pressure vessel and closes an opening of a relatively small cross section between the pressure vessel and the molding box.
  • a distributor cone is provided under the valve opening and underneath there is a perforated floor that extends over the entire mold area or, in another variant, an adjustable slot floor (DE-OS 2 151 949).
  • the invention has for its object to provide a device by means of which a uniform and sufficiently high compression with a uniform molding surface is possible with comparatively little design effort.
  • This object is achieved according to the invention in that the pressure vessel has an opening approximately corresponding to the outline of the molding box, against the edge of which the molding box can be pressed in a sealing manner with the filling frame and with which the closure member cooperates.
  • the opening cross-section can have any size, maximum the size of the molding box or filling frame cross-section, so that the compressed gas can pass through with the greatest possible speed with the greatest possible mass throughput, so that the molding material is compressed optimally and uniformly.
  • valve has a closure member which releases the opening cross-section mainly under the effect of the pressure in the pressure vessel.
  • the high potential energy of the compressed gas is thus used to open the valve, in other words: the driving force for the closure member is obtained directly from the compressed gas, which ensures the fastest possible acceleration of the closure member. No separate drive for the closure member is necessary. Only for the return of the closure member, which takes place in the depressurized state and therefore does not require large forces, is a relatively small one Driving force also to keep the closure member in the closed position of the valve.
  • Embodiments of this embodiment are characterized in claims 3 and 4.
  • a fixed grate is inserted into the opening of the pressure vessel and a sliding grate is arranged above it, which is under the action of a spring preload acting in its plane and is held in the closed position by a lock, after unlocking it under the spring preload into the open position is movable.
  • the drive of the closure member for opening is decoupled from the parts of the closure member which provide the valve closure. Due to the rust-like design of the closure member, the largest possible opening cross-section can be released in the shortest possible time with the smallest opening stroke which must correspond to the grate bar width, which in turn ensures rapid gas transfer with a high mass throughput. At the same time, the rust-like design of the opening ensures a uniform, full-surface impact of the gas pressure front on the molding material surface.
  • a mold box 2 sits on a model plate 1 with the model (not shown) and a filling frame 3 on this. These parts form the mold space.
  • a pressure vessel 4 for holding pressurized gas up to 20 bar is arranged above the molding space and is fed via a nozzle 5 from a pressure accumulator or - at low admission pressure - from the compressed air network.
  • the pressure vessel has an opening which is arranged centrally and whose inside width in the exemplary embodiment according to FIG. 1 corresponds approximately to the free horizontal cross section of the filling frame 3 or the molding box 2.
  • the unit consisting of model plate 1, molding box 2 and filling frame 3 can be pressed against the pressure vessel 4 with the opening 6 from below.
  • the opening 6 of the pressure vessel is assigned a closure member, designated overall by 8.
  • the closure member 9 is formed by two flaps 91 which are inclined towards one another above the opening 6 and in the direction thereof.
  • the flaps 91 are articulated on their mutually facing upper edges in bearings 92, while on their lower edges they are held in the closed position by means of a beam 93 of a holder 94. Sealing takes place on a circumferential sealing seat 95.
  • a plunger 97 which is in a housing 96 of the holder 94 is guided and actuated by a cam 98, the flaps are released and accelerated suddenly under the action of the compressed gas in the pressure vessel 4 into the open position shown in dashed lines. There their kinetic energy is destroyed by attenuators 99.
  • the closing movement can be carried out by conventional means such as springs, pneumatic cylinders or the like, while the locking in the closed position is done by springs 100.
  • the flaps 91 consist, for example, of a frame made of high-strength light metal alloy, which is connected to a plastic sheet, e.g. B. made of polyethylene (PE).
  • the opening 6 of the pressure vessel 4 is penetrated by the strips 101 of a fixed grate 102.
  • a sliding grate 103 is arranged, the strips 104 on the side facing the grate 102 with a sealing material 105, for. B. low-pressure PE are provided.
  • the strips 101 of the fixed grate 102 are additionally supported by ribs 106 against the static load of the compressed gas.
  • the sliding grate 103 is under a spring force 107 and is locked in the closed position shown in FIG. 2 by a locking lever 108.
  • the lock By pivoting the lever up, the lock is released and the stored spring force is suddenly released, so that the sliding grate is accelerated into its open position in which the strips 101 and 104 of the two gratings 102, 103 lie one above the other. In this position, the sliding grate 104 is braked by damping elements, not shown.
  • the sliding grate can be reset in a conventional manner until the locking lever 108 can be moved back into the locked position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
EP85102322A 1981-12-28 1982-11-27 Dispositif pour comprimer du matériel de moulage pour fonderies Expired EP0170765B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3151645 1981-12-28
DE3151645 1981-12-28
DE3206208 1982-02-20
DE3206208 1982-02-20

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP82110996.4 Division 1982-11-27

Publications (2)

Publication Number Publication Date
EP0170765A1 true EP0170765A1 (fr) 1986-02-12
EP0170765B1 EP0170765B1 (fr) 1988-08-31

Family

ID=25798338

Family Applications (2)

Application Number Title Priority Date Filing Date
EP82110996A Expired EP0084627B1 (fr) 1981-12-28 1982-11-27 Dispositif pour comprimer du matériel de moulage pour fonderies
EP85102322A Expired EP0170765B1 (fr) 1981-12-28 1982-11-27 Dispositif pour comprimer du matériel de moulage pour fonderies

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP82110996A Expired EP0084627B1 (fr) 1981-12-28 1982-11-27 Dispositif pour comprimer du matériel de moulage pour fonderies

Country Status (4)

Country Link
US (2) US4529026A (fr)
EP (2) EP0084627B1 (fr)
DD (1) DD203693A5 (fr)
PL (1) PL239713A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2198980A (en) * 1986-12-17 1988-06-29 Fischer Ag Georg Process for compressing granular moulding materials

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH664914A5 (de) * 1982-10-15 1988-04-15 Fischer Ag Georg Einrichtung zum verdichten einer masse von koernigem formstoff.
DE3327822A1 (de) * 1983-08-02 1985-02-14 Josef Mertes Engineering für Gießereianlagen, 5928 Laasphe Verfahren und vorrichtung zum verdichten von kornfoermigen formstoffen z.b. giessereiformsand
DE3344520A1 (de) * 1983-12-09 1985-06-20 BMD Badische Maschinenfabrik Durlach GmbH, 7500 Karlsruhe Vorrichtung zum verdichten von giesserei-formstoff mittels druckgas
CH666426A5 (de) * 1984-06-25 1988-07-29 Fischer Ag Georg Formanlage.
DE3518980A1 (de) * 1985-05-25 1986-11-27 BMD Badische Maschinenfabrik Durlach GmbH, 7500 Karlsruhe Vorrichtung zum verdichten von giesserei-formstoff mittels druckgas
ES2006861A6 (es) * 1988-03-21 1989-05-16 Lopez Foronda Fernandez Vicent Mejoras introducidas en campanas de aire para moldeo por onda expansiva.
ES2011685A6 (es) * 1988-10-21 1990-02-01 Lopez Foronda Fernandez Vicent Mejoras introducidas en maquinas de moldeo por impacto de aire.
DE3836876C2 (de) * 1988-10-29 1994-06-09 Badische Maschf Gmbh Verfahren und Vorrichtung zum Verdichten von Gießerei-Formstoff
CH686412A5 (de) * 1992-03-10 1996-03-29 Fischer Georg Giessereianlagen Verfahren zum Verdichten von Formsand fuer Giessformen.
DK0849017T3 (da) * 1996-12-17 2002-01-21 Loramendi Sa Forbedret luftslag eller -impuls sandformskomprimeringsmaskine
CN105170917B (zh) * 2015-09-30 2017-11-28 共享铸钢有限公司 一种大型圆盘类铸件的快速造型工装及其快速造型方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2151949A1 (de) * 1971-10-19 1973-04-26 Kramatorskij Ni I Pt I Mash Vorrichtung zum verdichten von formmasse
DE1961234B2 (de) * 1969-12-05 1974-06-12 Kramatorskij Nautschno-Issledowatel' Skij I Projektno-Technologitscheskij Institut Maschinostrojenija, Kramatorsk (Sowjetunion) Verfahren und Vorrichtung zum Verdichten von Gießereiformmassen
DE2844464B1 (de) * 1978-10-12 1980-04-24 Eugen Dipl-Ing Buehler Verfahren und Vorrichtung zum Verdichten von Giessformen

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1102978B (de) * 1954-12-29 1961-03-23 Dietrich Pulvermacher Pressformmaschine
DE2206672C3 (de) * 1972-02-11 1975-11-13 Nautschno-Issledowatelskij Institut Technologii Awtomobilnoj Promyschlennosti, Moskau Pneumatische Vorrichtung zum zwangsweisen Füllen von Kern- und Formkästen mit Formstoff
IT1006433B (it) * 1974-04-12 1976-09-30 Fomes Sa Testa di soffiaggio della sabbia negli stampi per la produzione di anime da fonderia
DE2653788C2 (de) * 1976-11-26 1981-08-27 Bühler, Eugen, Dipl.-Ing., 8871 Burtenbach Verfahren und Vorrichtung zum Herstellen von Gießformen aus bindemittelhaltigem Formsand
DE2833999C2 (de) * 1978-08-03 1981-11-19 Eugen Dipl.-Ing. 8871 Burtenbach Bühler Verfahren und Vorrichtung zur Herstellung von Gießformen und -kernen
DE2842912C2 (de) * 1978-10-02 1983-06-01 Alfelder Maschinen- und Modell-Fabrik Künkel, Wagner & Co KG, 3220 Alfeld Verfahren und Vorrichtung zum Herstellen von Sandgießformen o.dgl.
JPS55141355A (en) * 1979-04-19 1980-11-05 Sintokogio Ltd Mold molding method and its device
JPS55147459A (en) * 1979-08-28 1980-11-17 Nakada Giken:Kk Mold molding method
CH642288A5 (de) * 1980-02-18 1984-04-13 Fischer Ag Georg Verfahren und einrichtung zum verdichten von formstoff, insbesondere fuer giessformen.
SU1006042A1 (ru) * 1981-03-12 1983-03-23 Simchenko Boris N Импульсна головка

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1961234B2 (de) * 1969-12-05 1974-06-12 Kramatorskij Nautschno-Issledowatel' Skij I Projektno-Technologitscheskij Institut Maschinostrojenija, Kramatorsk (Sowjetunion) Verfahren und Vorrichtung zum Verdichten von Gießereiformmassen
DE2151949A1 (de) * 1971-10-19 1973-04-26 Kramatorskij Ni I Pt I Mash Vorrichtung zum verdichten von formmasse
DE2844464B1 (de) * 1978-10-12 1980-04-24 Eugen Dipl-Ing Buehler Verfahren und Vorrichtung zum Verdichten von Giessformen

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
SOVIET INVENTIONS ILLUSTRATED, Sektion Chemical M 22 P 53, Woche D 30, 02. September 1981, Zusammenfassungsnr. 54677, Derwent Publications Ltd., London, GB; & SU - A - 778 910 (KRAMA MECH. ENG. TECH.) 17.11.1980 *
SOVIET INVENTIONS ILLUSTRATED, Sektion Chemical M 22 P 53, Woche D 36, 14. Oktober 1981, Zusammenfassungsnr. 65688, Derwent Publications Ltd., London, GB; & SU - A - 789 205 (KRAMA MECH. ENG. RES) 23.12.1980 *
SOVIET INVENTIONS ILLUSTRATED, Sektion Chemical M 22 P 53, Woche E 41, 24. November 1982, Zusammenfassungsnr. 87636, Derwent Publications Ltd., London, GB; & SU - A - 889 266 (L.F. VASILKOWSKI) 15.12.1981 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2198980A (en) * 1986-12-17 1988-06-29 Fischer Ag Georg Process for compressing granular moulding materials
GB2198980B (en) * 1986-12-17 1991-03-27 Fischer Ag Georg Process for compressing granular moulding materials

Also Published As

Publication number Publication date
PL239713A1 (en) 1983-08-01
EP0170765B1 (fr) 1988-08-31
DD203693A5 (de) 1983-11-02
US4609033A (en) 1986-09-02
EP0084627B1 (fr) 1986-05-07
US4529026A (en) 1985-07-16
EP0084627A1 (fr) 1983-08-03

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