EP0170765B1 - 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
EP0170765B1
EP0170765B1 EP85102322A EP85102322A EP0170765B1 EP 0170765 B1 EP0170765 B1 EP 0170765B1 EP 85102322 A EP85102322 A EP 85102322A EP 85102322 A EP85102322 A EP 85102322A EP 0170765 B1 EP0170765 B1 EP 0170765B1
Authority
EP
European Patent Office
Prior art keywords
moulding
grille
opening
valve
molding
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
EP85102322A
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German (de)
English (en)
Other versions
EP0170765A1 (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.)
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
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(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by BMD Badische Maschinenfabrik Durlach GmbH filed Critical BMD Badische Maschinenfabrik Durlach 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 antechamber and, after opening a valve, is blown or shot into the molding space together with the air. In any case, this process requires mechanical re-pressing of the molding material in the molding box with significant press forces (e.g. DE-AS-2 844 464). In the other category, the molding material is poured onto the model and then suddenly pressurized with compressed air from the back of the mold (e.g. DE-AS-2 844 464, DE-AS-1 961 234).
  • the first variant (DE-AS-2 844 464)
  • existing compressed air up to 7 bar is blown in once or more times over a period of time between 0.2 and 1 s via openings in a hollow end plate of the molding space, the one flowing through the molding sand Air 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.
  • a pre-pressure of 100 bar is proposed for mold boxes of customary size in order to achieve a satisfactory compression there after relaxation in the mold space.
  • Such 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 present invention has for its object to provide a device by means of which a uniform and sufficiently high compression with a uniform molding material surface is possible with comparatively little design effort.
  • the pressure vessel has an opening 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 that a fixed grate is inserted into the opening and a sliding grate is arranged above it Effect of a spring preload acting in its plane and by Lock is held in the closed position, after unlocking it can be moved into the open position under the spring preload.
  • the opening cross-section can be released in a very short time with a small opening stroke, which only has to correspond to the width of the grate bar, which enables rapid gas transfer and mass throughput. It is also favorable that the drive of the sliding grate for opening is decoupled from those parts which provide the closure of the sliding grate.
  • the sliding grate With regard to the design of the sliding grate, it has proven to be advantageous that it is provided on its side facing the fixed grate with strips made of a wear-resistant, sealing material.
  • the fixed grate For the formation of the fixed grate, it is advisable to stiffen it on its strips by ribs so that it can better absorb the static load of the compressed gas.
  • the invention is described in more detail below with reference to the drawing.
  • the drawing shows a schematic, partially sectioned side view of the device.
  • the machine stand the devices for lifting and lowering the molding box and filling frame and, if appropriate, for ejecting the finished mold are not shown.
  • the facilities for bringing up the model and for filling in the molding sand are also not shown, since all of the above-mentioned components are known in foundry mechanical engineering.
  • a molding 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 (4) has a centrally arranged opening (6) at the bottom, the clear width of which 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 with said opening (6) from below.
  • a closure member (9) is inserted into the opening (6) of the pressure vessel (4). It consists of strips (101) of a fixed grate (102) and a sliding grate (103) arranged above them. The strips (104) of the sliding grate (103) are provided on their underside with a sealing material (105), for example low-pressure PE.
  • 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 the action of a spring (107) and is held in the closed position shown by a locking lever (108). By pivoting the lever (108) the lock is released and the stored spring force can suddenly relax, so that the sliding grate (103) is accelerated into its open position until the strips (101) and (104) of the two grids lie one above the other. Attenuators, not shown, can brake the impact of the sliding grate (104) in the open position.
  • the sliding grate (103) can be reset in a conventional manner until the locking lever (108) can be moved back into the locked position.

Claims (4)

1. Dispositif pour compacter un matériau de moulage pourfonderies versé en vrac sur un modèle dans un volume de moule fermé, au moyen d'un gaz comprimé agissant sur la surface du matériau de moulage, lequel gaz provenant d'un réservoir sous pression élevée est détendu brusquement dans le volume de moule par l'intermédiaire d'une soupape située entre le réservoir et le volume de moule, ce volume de moule étant constitué par un châssis de moule (2) comportant une réhausse (3) et par une plaque modèle (1) constituant le fond de celui-ci et portant le modèle, et la soupape comportant un organe de fermeture (9) qui dégage la section d'ouverture en quelques millisecondes, caractérisé en ce que le réservoir sous pression (4) comporte une ouverture (6) correspondant au contour du châssis de moule (2) contre le bord (7) de laquelle on peut appliquer hermétiquement le châssis de moule (2) avec la réhausse (3) et en ce qu on place une grille fixe (102) dans l'ouverture (6) et qu'on place par dessus une grille coulissante (t03) qui est soumise à la précontrainte d'un ressort (107) agissant dans son plan et est maintenue en position de fermeture par un verrouillage (108), après le déverrouillage duquel elle peut être amenée en position d'ouverture sous l'effet de la précontrainte du ressort.
2. Dispositif selon la revendication 1, caractérisé en ce que la grille coulissante (103) comporte sur le côté tourné vers la grille fixe (102) des bandeaux (105) en un matériau étanche résistant à l'usure.
3. Disposition selon la revendication 1 ou 2, caractérisé en ce que la grille fixe (102) est raidie par des nervures (106) sur ses bandeaux (104) contre la charge statique du gaz comprimé.
4. Dispositif selon. les revendications 1 à 3, caractérisé en ce que l'organe de fermeture (9) et les parties qui le tiennent sont groupés pour former une unité qui est fixée de façon interchangeable sur le réservoir sous pression (4).
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 EP0170765A1 (fr) 1986-02-12
EP0170765B1 true 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
CN105170917A (zh) * 2015-09-30 2015-12-23 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

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
CH672270A5 (fr) * 1986-12-17 1989-11-15 Fischer Ag Georg
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.
EP0849017B1 (fr) * 1996-12-17 2001-10-04 Loramendi, S.A. Machines moulage à impulsion de pression d'air

Family Cites Families (13)

* 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
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
DE2151949A1 (de) * 1971-10-19 1973-04-26 Kramatorskij Ni I Pt I Mash Vorrichtung zum verdichten von formmasse
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.
DE2844464C2 (de) * 1978-10-12 1983-03-24 Bühler, Eugen, Dipl.-Ing., 8871 Burtenbach Verfahren und Vorrichtung zum Verdichten von Gießformen
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105170917A (zh) * 2015-09-30 2015-12-23 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

Also Published As

Publication number Publication date
US4609033A (en) 1986-09-02
PL239713A1 (en) 1983-08-01
EP0084627B1 (fr) 1986-05-07
US4529026A (en) 1985-07-16
DD203693A5 (de) 1983-11-02
EP0084627A1 (fr) 1983-08-03
EP0170765A1 (fr) 1986-02-12

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