EP0650788A1 - Apparatus for compacting powdery materials - Google Patents

Apparatus for compacting powdery materials Download PDF

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Publication number
EP0650788A1
EP0650788A1 EP94116286A EP94116286A EP0650788A1 EP 0650788 A1 EP0650788 A1 EP 0650788A1 EP 94116286 A EP94116286 A EP 94116286A EP 94116286 A EP94116286 A EP 94116286A EP 0650788 A1 EP0650788 A1 EP 0650788A1
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EP
European Patent Office
Prior art keywords
compression
post
pressure
molding
valve arrangement
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.)
Withdrawn
Application number
EP94116286A
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German (de)
French (fr)
Inventor
Hans Leutwiler
Kurt Fischer
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.)
Georg Fischer Giessereianlagen AG
Original Assignee
Georg Fischer Giessereianlagen AG
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 Georg Fischer Giessereianlagen AG filed Critical Georg Fischer Giessereianlagen AG
Publication of EP0650788A1 publication Critical patent/EP0650788A1/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D45/00—Equipment for casting, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/28—Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing

Definitions

  • the present invention relates to a device for compacting granular molding materials, in particular foundry molding materials, by means of at least one pressure surge of a gaseous medium which is introduced onto the top of a molding material mass loosely poured over a model device.
  • the known molding machines are designed for various compression processes, e.g. for the one-step compression process, be it by pressing or air impulse, or for the two-step compression process, where pre-compression is carried out by a pressure surge and is then mechanically or pneumatically compressed.
  • the object of the present invention is to propose a device by means of which the known compression methods can be used optionally depending on the model requirements.
  • the device should be economical and able to work with the lowest possible dead volume.
  • a pressure housing 2 is sealingly connected to a control housing 2a.
  • a valve arrangement 4 separates the two housings from one another.
  • the sealing member is designed in the form of an annular disk, so that a cylinder can be arranged through the annular passage, which cylinder is fixed on the control chamber side with the valve housing.
  • a press head 7 is arranged at the mold chamber end of the cylinder.
  • the press head has a highly elastic plate that adapts to the different model contours.
  • the press head is fully arranged in the mold space 3.
  • the distance between the press head and the mold cavity wall is dimensioned so that a pneumatic pressure surge can be run with the required gradients.
  • FIG. 2 Another embodiment is shown in FIG. 2.
  • a highly elastic press plate 11 is arranged below the valve 4 so that it cannot move in height.
  • a spacer plate 12 is located between the valve 4 and the press plate 11. It is surrounded by an annular channel 13 which directs the air from the pulse valve 4 via the press plate 11 to the molding space 14.
  • a frame 15 forms a vertically movable seal of the molding frame with respect to the pressure chamber 16.
  • the molding device consisting of the model plate, molding box and filling frame, is pressed against the pressing plate 11 and post-compressed.
  • the arrangements aim to reduce the formation of dead spaces because they worsen the pressure gradient. Dead spaces have a detrimental effect on the pressure gradient and therefore worsen the compression result.
  • the advantage of the arrangement described is essentially that the dead volume can be kept to a minimum and that a steep pressure gradient can be driven in the precompression stage.
  • the possibility of setting a high pressure gradient and thus a high degree of efficiency can ensure optimal compression.
  • An advantage of pre-compression with a steep pressure gradient is that no slot nozzles are required in the model plates.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

The invention proposes an apparatus for compacting granular moulding materials, it being possible to select a single-stage or two-stage process, with a pressure vessel, a pressure housing that can be connected to a moulding device, a pressure space (16) which is separated from the said housing by at least one valve arrangement (4), and means for recompaction (11), the means for recompaction being arranged in the mould cavity and a spacer element (12) being arranged between the means for recompaction to reduce the clearance volume. <IMAGE>

Description

Die vorliegende Erfindung bezieht sich auf eine Vorrichtung zum Verdichten von körnigen Formstoffen, insbesondere Giessereiformstoffen, mittels mindestens eines Druckstosses eines gasförmigen Mediums, das auf die Oberseite einer lose über eine Modelleinrichtung geschütteten Formstoffmasse eingebracht wird.The present invention relates to a device for compacting granular molding materials, in particular foundry molding materials, by means of at least one pressure surge of a gaseous medium which is introduced onto the top of a molding material mass loosely poured over a model device.

Für das Verdichten von körnigen Formstoffen sind verschiedene Verfahren und Formmaschinen bekannt. Die bekannten Formmaschinen sind auf verschiedene Verdichtungsverfahren ausgerichtet, so z.B. für das Einstufen-Verdichtungsverfahren, sei es durch Pressen oder Luftimpuls, oder für das Zweistufen-Verdichtungsverfahren, wobei eine Vorverdichtung durch einen Druckstoss erfolgt und anschliessend mechanisch oder pneumatisch fertig verdichtet wird.Various processes and molding machines are known for compacting granular molding materials. The known molding machines are designed for various compression processes, e.g. for the one-step compression process, be it by pressing or air impulse, or for the two-step compression process, where pre-compression is carried out by a pressure surge and is then mechanically or pneumatically compressed.

Aufgabe der vorliegenden Erfindung ist es eine Vorrichtung vorzuschlagen, mit deren Hilfe die bekannten Verdichtungsverfahren wahlweise je nach Modellerfordernissen eingesetzt werden können. Die Vorrichtung soll wirtschaftlich sein und mit einem möglichst geringen Totvolumen arbeiten können.The object of the present invention is to propose a device by means of which the known compression methods can be used optionally depending on the model requirements. The device should be economical and able to work with the lowest possible dead volume.

Diese Aufgabe wird durch die Merkmale des Anspruches 1 gelöst.This object is solved by the features of claim 1.

Weitere vorteilhafte Ausgestaltungen gehen aus den abhängigen Ansprüchen hervor.Further advantageous configurations emerge from the dependent claims.

Anhand der Figuren wird ein bevorzugtes Ausführungsbeispiel näher beschrieben.A preferred exemplary embodiment is described in more detail with reference to the figures.

Die Figur 1 zeigt einen Schnitt durch eine Verdichtungsanordnung 1. Ein Druckgehäuse 2 ist mit einem Steuergehäuse 2a dichtend verbunden. Eine Ventilanordnung 4 trennt die beiden Gehäuse voneinander. Das Dichtorgan ist ringscheibenförmig ausgebildet, so dass durch den ringförmigen Durchgang ein Zylinder angeordnet werden kann, der steuerraumseitig mit dem Ventilgehäuse fixiert ist.1 shows a section through a compression arrangement 1. A pressure housing 2 is sealingly connected to a control housing 2a. A valve arrangement 4 separates the two housings from one another. The sealing member is designed in the form of an annular disk, so that a cylinder can be arranged through the annular passage, which cylinder is fixed on the control chamber side with the valve housing.

Am formraumseitigen Ende des Zylinders ist ein Presshaupt 7 angeordnet. Das Presshaupt weist eine hoch elastische Platte auf, die sich den unterschiedlichen Modellkonturen anpasst.A press head 7 is arranged at the mold chamber end of the cylinder. The press head has a highly elastic plate that adapts to the different model contours.

Das Presshaupt ist voll im Formraum 3 angeordnet. Der Abstand zwischen dem Presshaupt und der Formraumwandung ist so bemessen, dass ein pneumatischer Druckstoss mit den erforderlichen Gradienten gefahren werden kann.The press head is fully arranged in the mold space 3. The distance between the press head and the mold cavity wall is dimensioned so that a pneumatic pressure surge can be run with the required gradients.

Eine weitere Ausführungform zeigt Figur 2. In diesem Fall ist eine hoch elastische Pressplatte 11 unterhalb des Ventils 4 höhenunbeweglich angeordnet. Eine Distanzplatte 12 befindet sich zwischen Ventil 4 und Pressplatte 11. Sie ist von einem Ringkanal 13 umgeben, der die Luft vom Impulsventil 4 über die Pressplatte 11 zum Formraum 14 leitet.Another embodiment is shown in FIG. 2. In this case, a highly elastic press plate 11 is arranged below the valve 4 so that it cannot move in height. A spacer plate 12 is located between the valve 4 and the press plate 11. It is surrounded by an annular channel 13 which directs the air from the pulse valve 4 via the press plate 11 to the molding space 14.

Ein Rahmen 15 bildet eine höhenbewegliche Abdichtung des Formrahmens gegenüber dem Druckraum 16. Nach dem Vorverdichten durch den Druckimpuls wird die Formeinrichtung, bestehend aus Modellplatte, Formkasten und Füllrahmen, gegen die Pressplatte 11 gepresst und nachverdichtet.A frame 15 forms a vertically movable seal of the molding frame with respect to the pressure chamber 16. After the pre-compression by the pressure pulse, the molding device, consisting of the model plate, molding box and filling frame, is pressed against the pressing plate 11 and post-compressed.

Die Anordnungen zielen darauf ab, dass die Bildung von Toträumen reduziert wird, weil diese den Druckgradienten verschlechtern. Toträume wirken sich schädlich auf den Druckgradienten aus und verschlechtern daher das Verdichtungsergebnis.The arrangements aim to reduce the formation of dead spaces because they worsen the pressure gradient. Dead spaces have a detrimental effect on the pressure gradient and therefore worsen the compression result.

Ausserdem erfordert das Auffüllen der Toträume einen wesentlich höheren Druckmediumbedarf, woraus sich ein wesentlich schlechterer energietechnischer Wirkungsgrad ergibt.In addition, the filling of the dead spaces requires a significantly higher pressure medium, which results in a much poorer energy efficiency.

Der Vorteil der beschriebenen Anordnung besteht im wesentlichen darin, dass das Totvolumen minimal gehalten werden kann und dass ein steiler Druckgradient in der Vorverdichtungsstufe gefahren werden kann. Durch die Möglichkeit der Einstellung eines hohen Druckgradienten und damit eines hohen Wirkungsgrades kann eine optimale Verdichtung gewährleistet sein.The advantage of the arrangement described is essentially that the dead volume can be kept to a minimum and that a steep pressure gradient can be driven in the precompression stage. The possibility of setting a high pressure gradient and thus a high degree of efficiency can ensure optimal compression.

Ein Vorteil der Vorverdichtung mit einem steilen Druckgradienten besteht darin, dass keine Schlitzdüsen in den Modellplatten erforderlich sind.An advantage of pre-compression with a steep pressure gradient is that no slot nozzles are required in the model plates.

Wesentliches Merkmal der beschriebenen Anordnungen ist die Kombination der Verwendung von verschiedenen Verdichtungsverfahren.An essential feature of the arrangements described is the combination of the use of different compression methods.

Claims (5)

Vorrichtung zum Verdichten von körnigen Formstoffen, wobei wahlweise ein einstufiges oder zweistufiges Verfahren gefahren werden kann, mit einem Druckbehälter, einem mit einer Formeinrichtung verbindbaren Druckgehäuse, einen durch mindestens eine Ventilanordnung davon getrennten Druckraum, und Mittel zur Nachverdichtung, dadurch gekennzeichnet, dass die Mittel zur Nachverdichtung im Formraum angeordnet sind und dass zwischen den Mitteln zur Nachverdichtung ein Distanzelement zur Verkleinerung des Totvolumens vorgesehen ist.Device for compacting granular molding materials, whereby a one-step or two-step process can be carried out, with a pressure vessel, a pressure housing that can be connected to a molding device, a pressure chamber separated from it by at least one valve arrangement, and means for post-compression, characterized in that the means for Post-compression are arranged in the mold space and that a spacer element for reducing the dead volume is provided between the means for post-compression. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Ventilanordnung ringflächenförmig ausgebildet ist, und dass durch den Ringbereich ein Zylinder durchgreift, der steuerraumseitig mit der Ventilanordnung verbunden ist und formraumseitig eine flexible Platte trägt.Apparatus according to claim 1, characterized in that the valve arrangement is designed in the form of an annular surface, and that a cylinder extends through the annular region, which is connected to the valve arrangement on the control chamber side and carries a flexible plate on the mold space side. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die flexible Platte eine hoch elastische Platte ist.Device according to claim 1, characterized in that the flexible plate is a highly elastic plate. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Distanzorgan fest montiert ist, und dass zur Nachverdichtung die Formkombination vertikal verfahrbar ist.Apparatus according to claim 1, characterized in that the spacer is fixed and that the combination of shapes is vertically movable for post-compression. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die flexible Platte mittels der Zylinderanordnung (6) in den Formraum bewegbar ist.Device according to claim 2, characterized in that the flexible plate can be moved into the molding space by means of the cylinder arrangement (6).
EP94116286A 1993-10-29 1994-10-15 Apparatus for compacting powdery materials Withdrawn EP0650788A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3273/93 1993-10-29
CH327393 1993-10-29

Publications (1)

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EP0650788A1 true EP0650788A1 (en) 1995-05-03

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EP94116286A Withdrawn EP0650788A1 (en) 1993-10-29 1994-10-15 Apparatus for compacting powdery materials

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US (1) US5476136A (en)
EP (1) EP0650788A1 (en)
JP (1) JPH07164106A (en)
KR (1) KR950011013A (en)
BR (1) BR9404270A (en)
CZ (1) CZ238894A3 (en)
HU (1) HUT69219A (en)
RU (1) RU94039298A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1155761A1 (en) * 2000-05-19 2001-11-21 Josef Mertes Method and apparatus for the densification of moulding materials e.g. foundry sand

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3164271B2 (en) * 1994-12-09 2001-05-08 新東工業株式会社 Mold making equipment
DE69707094T2 (en) * 1996-12-17 2002-07-04 Loramendi, S.A. Air pressure pulse-forming machines
US6749003B2 (en) * 2000-04-13 2004-06-15 Sintokogio, Ltd. Compressing method for casting sand and device therefor
JP3407879B2 (en) * 2000-04-13 2003-05-19 新東工業株式会社 Method and apparatus for filling and compressing molding sand
WO2001081025A1 (en) * 2000-04-21 2001-11-01 Sintokogio, Ltd. Die molding machine and pattern carrier
EP1240957B1 (en) * 2001-03-16 2007-01-03 Sintokogio, Ltd. Method and apparatus for compacting molding sand
WO2016095179A1 (en) * 2014-12-18 2016-06-23 苏州明志科技有限公司 Controllable sand shooting mechanism of core shooter and sand shooting method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1256337A (en) * 1959-05-06 1961-03-17 Knight Engineering Establishme Automatic molding machine
GB975475A (en) * 1962-10-08 1964-11-18 Baker Perkins Ltd Improvements in and relating to the moulding of articles from granulated materials
EP0560116A1 (en) * 1992-03-10 1993-09-15 Georg Fischer Giessereianlagen Ag Process for compacting foundry moulding sand

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Publication number Priority date Publication date Assignee Title
SU638419A1 (en) * 1977-07-01 1978-12-28 Краматорский Научно-Исследовательский И Проектно-Технологический Институт Машинотсроения Moulding frame
DE3319030A1 (en) * 1983-05-26 1984-11-29 BMD Badische Maschinenfabrik Durlach GmbH, 7500 Karlsruhe DEVICE FOR COMPRESSING FOUNDRY SAND IN THE GAS PRESSURE METHOD
AU644702B2 (en) * 1990-12-14 1993-12-16 Sintokogio Ltd. Compressed air blowing apparatus for use in green sand mold molding facility
ES2048635B1 (en) * 1991-10-30 1996-07-01 Erana Agustin Arana HEAD FOR AIR IMPACT SAND BOX MOLDING MACHINES.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1256337A (en) * 1959-05-06 1961-03-17 Knight Engineering Establishme Automatic molding machine
GB975475A (en) * 1962-10-08 1964-11-18 Baker Perkins Ltd Improvements in and relating to the moulding of articles from granulated materials
EP0560116A1 (en) * 1992-03-10 1993-09-15 Georg Fischer Giessereianlagen Ag Process for compacting foundry moulding sand

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
C MC COMBE: "Recent trends in greensand moulding machine design", FOUNDRY TRADE JOURNAL 166 (1992) MAY 1, NO. 3453, REDHILL, SURREY, GB *
FRANZ WEISS: "Entwicklung einer kastenlosen Vakuum-Press-Formmaschine für kleinere und mittlere Giessereien", GIESSEREI 81 (1994) 21 FEBRUAR, NO. 4, SEITE 90-96, DüSSELDORF *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1155761A1 (en) * 2000-05-19 2001-11-21 Josef Mertes Method and apparatus for the densification of moulding materials e.g. foundry sand

Also Published As

Publication number Publication date
CZ238894A3 (en) 1995-08-16
HU9403104D0 (en) 1994-12-28
RU94039298A (en) 1996-09-10
JPH07164106A (en) 1995-06-27
BR9404270A (en) 1995-07-04
KR950011013A (en) 1995-05-15
HUT69219A (en) 1995-08-28
US5476136A (en) 1995-12-19

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