EP0128336B1 - Vorrichtung zum Verdichten von Giessereiformsand - Google Patents

Vorrichtung zum Verdichten von Giessereiformsand Download PDF

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Publication number
EP0128336B1
EP0128336B1 EP84105049A EP84105049A EP0128336B1 EP 0128336 B1 EP0128336 B1 EP 0128336B1 EP 84105049 A EP84105049 A EP 84105049A EP 84105049 A EP84105049 A EP 84105049A EP 0128336 B1 EP0128336 B1 EP 0128336B1
Authority
EP
European Patent Office
Prior art keywords
gas
sand
pattern
layer
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
EP84105049A
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German (de)
English (en)
French (fr)
Other versions
EP0128336A1 (de
Inventor
Norbert Ing.-Grad. Damm
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 EP0128336A1 publication Critical patent/EP0128336A1/de
Application granted granted Critical
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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 compacting foundry molding sand by the sudden action of gas pressure on the molding sand heaped up in a molding box above a model plate with a model, a gas-permeable layer on which the gas pressure is brought about being arranged directly above the surface of the uncompressed molding sand.
  • the gas pressure is converted into kinetic energy, which is transferred to the molding sand surface.
  • the gas permeability of the additional mass there is an exchange of momentum between the gas and the molding sand surface.
  • the gas penetrates the molding sand and leads to a fluidization effect. In connection with the impact energy generated by the gas pressure, this is responsible for the compression of the molding sand.
  • the invention is based on the object of developing the device mentioned at the outset in such a way that crack formation within the mold is avoided with a largely uniform profile of the mold hardness in horizontal cross-sectional planes of the mold.
  • the layer has a gas permeability which is adapted to the height of the molding sand to be compacted in such a way that it is lower in the region of high and / or plateau-like model contours than in the model-free region of the model plate.
  • the present invention achieves the same goal in that the gas permeability of the layer to the height course of the model is adjusted above the model plate, ie the gas pressure in the area of a high compression stroke (lowering of the molding sand surface) is more effective than in the area of small compression strokes (large and extensive model heights).
  • the gas permeability of the layer to the height course of the model is adjusted above the model plate, ie the gas pressure in the area of a high compression stroke (lowering of the molding sand surface) is more effective than in the area of small compression strokes (large and extensive model heights).
  • more gas penetrates into the molding sand at those points, thus leading to greater fluidization than in the latter areas. Practical investigations have shown that the indicated crack formation is reliably avoided.
  • the reason for this may be that the compression achieved by the gas pressure through the exchange of impulses between the sand particles and the fluidization effect takes place for all partial molding sand volumes at the same speed or in the same time span, so that adjacent molding sand volumes carry out the compression stroke at the same time and neither vertical Relative movements between this molding sand volume, still horizontal pressure compensation movements occur due to a leading compression in certain parts of the mold.
  • the effect shown can be further increased in that zones of different gas permeability of the layer are also delimited from one another in the vertical direction by partition walls immersed in the molding sand.
  • These bulkheads separate mold sand volumes that are vertically adjacent to one another at least over part of the filling height, corresponding to the extent of the gas permeability of the layer, so that the influences on the gas pressure wave that are predetermined by the different gas permeability are also maintained at a distance in the depth of the mold. This prevents «short circuit» currents between adjacent sand volumes.
  • These bulkheads can extend, for example, into the area of the model contour. This means that they not only separate these mold sand volumes from each other in the loosely heaped state, but also protrude into the finally compacted area of the mold.
  • the gas-permeable layer is partly fixed in place, partly loosely placed on the surface of the molding sand and can be moved with it. As far as the layer can be moved, it forms an additional mass accelerated by gas pressure, the kinetic energy of which is transferred to the molding sand and leads to an additional compaction effect.
  • the procedure is preferably such that the layer is stationary in the area above the model, ie where the lower gas permeability is provided, and in the area above the free model plate, in which the larger compression stroke is to be carried out.
  • the entire gas-permeable layer may be placed on the surface of the molding sand and with this mitbeweg - its bar, wherein then preferably provided that the mass density of the layer high in the area and / or plateau-like pattern contours is smaller than in the model-free region of the pattern plate .
  • the layer is preferably designed to be flexible so that it can follow a different compression stroke.
  • a filling frame is placed on the molding box in the gas pressure molding process which, together with the molding box, picks up the loosely poured molding sand.
  • the stationary part of the gas-permeable layer is attached to the filling frame so that it can always remain on the filling frame and does not interfere with lowering movements of the molding box with the finished mold.
  • the bulkheads are attached both to the fixed part of the gas-permeable layer and to the molding box and extend into the molding box. In this way, the bulkhead walls do not interfere with the mold box movements.
  • the gas-permeable layer is formed from one or more perforated sheets with a free hole cross section adapted to the desired gas permeability.
  • FIG. 1 shows a model plate 1 with a model 2, which closes a molding box 3 on the underside.
  • a filling frame 4 is placed on the molding box 3 and forms the molding space together with the molding box.
  • a pressurized gas pre-chamber 5 is arranged above this molding space and is closed at the top by a plate 6.
  • the line 8 of a compressed gas store 7 opens into the antechamber 5, into which a valve (not shown) with a large opening cross section is arranged.
  • the devices required for manipulating the molding box 3 and the filling frame 4 and for filling the molding sand can be of a conventional type and are therefore not shown in detail in the drawing.
  • the gas pressure required for compression can either be taken from a compressed gas store, as shown in the drawing, or else can be generated by the explosion of a fuel gas mixture.
  • a gas-permeable layer 10 Arranged above the free surface of the molding sand filling 11 in the molding box 3 and filling frame 4 is a gas-permeable layer 10, which in this exemplary embodiment has two areas of different gas permeability, namely an outer edge area 12 with high gas permeability and a central area 13 with lower gas permeability. This middle area is located approximately above the model 2, in particular the high and plateau-like areas of the model contour, while the area 12 of greater gas permeability is located approximately above the areas of the model plate 1 free of the model 2.
  • the gas-permeable layer is formed in two parts, one part 14 forming the zone 12 with greater gas permeability, the other part 15 forming the zone 13 with less gas permeability.
  • the gas permeability in zone 13 is at most 10% of the free cross section of the filling frame in this area.
  • the part 15 with the zone 13 of lower gas permeability is fixed in this embodiment, for example fixed to the filling frame 4 by means of ribs 16, while the other part 14 is loosely placed on the molding sand surface below the ribs 16.
  • the parts 14 and 15 of different gas permeability can each be formed from perforated plates, the zone 13 having a lower gas Permeable perforated plate of part 15 can be supported by a grate 17.
  • the zones 12, 13 of different gas permeability are separated from one another to the depth of the molding sand filling by bulkheads 18, which are fastened to the filling frame, specifically via the ribs 16 together with the stationary part 15 of the gas-permeable layer, and for example to the level of the molding box 3 pass.
  • the bulkhead walls 19 can be continued with fastening ribs 20 in the upper part of the molding box 3 in analogy to conventional box shears.
  • the bulkheads 19 end at the required distance above the highest model contour.
  • an inverted arrangement of the parts 14 and 15 can also be provided, for example when it comes to the production of bathtub lower parts in which the walls are located in the edge region of the molding box 3.
  • zones 12, 13 can advantageously be arranged vertically up to the model area.
  • the division of the zones of different gas permeability can be adapted to the conditions specified by the model.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
EP84105049A 1983-05-11 1984-05-04 Vorrichtung zum Verdichten von Giessereiformsand Expired EP0128336B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833317196 DE3317196A1 (de) 1983-05-11 1983-05-11 Vorrichtung zum verdichten von giessereiformsand
DE3317196 1983-05-11

Publications (2)

Publication Number Publication Date
EP0128336A1 EP0128336A1 (de) 1984-12-19
EP0128336B1 true EP0128336B1 (de) 1988-03-30

Family

ID=6198731

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84105049A Expired EP0128336B1 (de) 1983-05-11 1984-05-04 Vorrichtung zum Verdichten von Giessereiformsand

Country Status (5)

Country Link
US (1) US4592406A (enrdf_load_stackoverflow)
EP (1) EP0128336B1 (enrdf_load_stackoverflow)
JP (2) JPS59218241A (enrdf_load_stackoverflow)
DD (1) DD216654A5 (enrdf_load_stackoverflow)
DE (2) DE3317196A1 (enrdf_load_stackoverflow)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3836876C2 (de) * 1988-10-29 1994-06-09 Badische Maschf Gmbh Verfahren und Vorrichtung zum Verdichten von Gießerei-Formstoff
ES2131433B1 (es) * 1996-01-18 2000-03-01 Loramendi Sa Dispositivo de alta compactacion para maquinas de moldeo de cajas de arena por impacto de aire.
WO1998045070A1 (es) * 1997-04-08 1998-10-15 Loramendi, S.A. Dispositivo de alta compactacion para maquinas de moldeo de cajas de arena por impacto de aire
TW555599B (en) * 2000-04-13 2003-10-01 Sintokogio Ltd Compressing method for casting sand and device therefor
KR100838875B1 (ko) * 2000-04-21 2008-06-16 신토고교 가부시키가이샤 주형 조형기 및 패턴 캐리어

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0089547A1 (de) * 1982-03-23 1983-09-28 BMD Badische Maschinenfabrik Durlach GmbH Verfahren und Vorrichtung zum Verdichten von Giessereiformstoff

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3170202A (en) * 1962-08-22 1965-02-23 Sr William J Huston Foundry process
CH462392A (de) * 1967-08-16 1968-09-15 Buehrer Erwin Verfahren zum Dosieren von zwei Formsandsorten in einen Formkasten einer Giessereiform
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
DE2305229C3 (de) * 1972-02-04 1975-04-17 Sintokogio, Ltd., Nagoya, Aichi (Japan) Formkasten
US4067380A (en) * 1973-06-28 1978-01-10 British Cast Iron Research Association Making foundry moulds
US4129165A (en) * 1976-11-02 1978-12-12 Baker Perkins Holdings Limited Preparation of foundry moulds and cores
AT381877B (de) * 1978-12-15 1986-12-10 Fischer Ag Georg Verfahren und vorrichtung zum verdichten von koernigen stoffen, insbesondere giessereiformstoff
CH642288A5 (de) * 1980-02-18 1984-04-13 Fischer Ag Georg Verfahren und einrichtung zum verdichten von formstoff, insbesondere fuer giessformen.
EP0062331A1 (de) * 1981-04-02 1982-10-13 BMD Badische Maschinenfabrik Durlach GmbH Verfahren und Vorrichtung zum pneumatischen Verdichten von Formsand
CH653579A5 (de) * 1981-07-20 1986-01-15 Fischer Ag Georg Verfahren zum verdichten von koernigen formstoffen, insbesondere giessereiformstoffen, und vorrichtung zur durchfuehrung des verfahrens.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0089547A1 (de) * 1982-03-23 1983-09-28 BMD Badische Maschinenfabrik Durlach GmbH Verfahren und Vorrichtung zum Verdichten von Giessereiformstoff

Also Published As

Publication number Publication date
DE3470121D1 (en) 1988-05-05
DE3317196C2 (enrdf_load_stackoverflow) 1988-11-17
EP0128336A1 (de) 1984-12-19
JP2516863B2 (ja) 1996-07-24
JPH07100586A (ja) 1995-04-18
US4592406A (en) 1986-06-03
DD216654A5 (de) 1984-12-19
DE3317196A1 (de) 1984-11-22
JPS59218241A (ja) 1984-12-08

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