EP0310802B1 - Verfahren und Vorrichtung zur Herstellung von Giessereiformen und-kernen aus Sand mit einem Bindemittel - Google Patents

Verfahren und Vorrichtung zur Herstellung von Giessereiformen und-kernen aus Sand mit einem Bindemittel Download PDF

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Publication number
EP0310802B1
EP0310802B1 EP88113769A EP88113769A EP0310802B1 EP 0310802 B1 EP0310802 B1 EP 0310802B1 EP 88113769 A EP88113769 A EP 88113769A EP 88113769 A EP88113769 A EP 88113769A EP 0310802 B1 EP0310802 B1 EP 0310802B1
Authority
EP
European Patent Office
Prior art keywords
pressure container
pressure
reagent
container
supplied
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 - Lifetime
Application number
EP88113769A
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German (de)
English (en)
French (fr)
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EP0310802A1 (de
Inventor
Franz Gähler
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AT88113769T priority Critical patent/ATE76340T1/de
Publication of EP0310802A1 publication Critical patent/EP0310802A1/de
Application granted granted Critical
Publication of EP0310802B1 publication Critical patent/EP0310802B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening
    • B22C9/123—Gas-hardening
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/65—Vaporizers

Definitions

  • the invention relates to a method and a device for producing molds or cores from a foundry sand mixed with a binder and introduced into a mold box or core box, which for curing a pressure container connected to the mold or core box has a vacuum therein evaporated reagent is supplied.
  • a method and a device for curing an organic binder in a mold or core box are known, in which / by means of a connected pump the pressure within of the mold or core box is reduced.
  • a valve to a reagent container is opened, whereby an, for example liquid amine therein is exposed to the low pressure of the mold or core box for evaporation and at the same time a carrier gas is supplied to the reagent container.
  • the amine evaporated thereby and mixed with the carrier gas is essentially sucked in by the negative pressure present in the mold or core box for curing the material contained therein.
  • a vacuum is generated to transfer the vaporized amine in the mold or core box, the amine thus evaporated being fed to the mold or core box without an appropriate dosage.
  • the negative pressure is released, which results in a reduced evaporation of the reagent.
  • a method and a device are also known, in which a liquid hardener is metered from a storage container via a nozzle valve to an evaporator and is evaporated therein.
  • the evaporated, gaseous hardener is fed to the mold or core box from a carrier gas air stream supplied to the evaporator.
  • the invention has for its object to improve a method and a device for curing molds or cores in such a way that, using appropriate amines or other reagents, an optimal evaporation and supply of the vaporized reagents to the mold or core box and thereby a uniform curing of the molds or cores and a significantly reduced odor nuisance can be achieved.
  • the object is achieved according to the method according to the invention in that the required vacuum and an elevated temperature are first generated in the pressure vessel and then the reagent for evaporation is fed to the pressure vessel, and then the pressure vessel under pressure with a gaseous gas under pressure Medium is applied and thereby the vaporized reagent is fed to the mold or core box.
  • the device according to the invention for carrying out the method comprises a pressure vessel operatively connected to a pressure source and a vacuum pump, from which a reagent vaporized therein can be fed to a mold or core box connected to the pressure vessel, and is characterized in that the pressure vessel is designed to be heatable and that Reagent to be evaporated can be fed to the pressure container from a storage container via a metering pump.
  • a control valve is assigned to each of the individual organs connected to the pressure vessel (mold or core box, heating element, pressure source, vacuum pump and metering pump), the individual control valve being precisely controllable by a control device connected to a processor.
  • 1 designates a housing-like mold or core box, in which a foundry mold or a foundry core is produced by curing the foundry sand introduced therein and mixed with a binder.
  • a reagent e.g. used in the form of a liquid amine, of which a certain amount is provided in a storage container 2.
  • the storage container 2 expediently holds such an amount that it covers a daily requirement, the supply being expediently monitored by a level measuring device 3.
  • the level measuring device 3 is shown schematically as a standpipe, but other level measuring devices can also be used.
  • the storage container 2 has a feed line 4 which can be closed and opened by a 2/2 valve 5 (with two switching positions and two connections). Through the feed line 4, the reagent can be fed from a reserve container 6 to the storage container 2.
  • the pressure vessel 7 has a number of line connections 8-11. At the connection 8, a compressed air or compressed gas supply line 12 ends, at the beginning of which a pressure source 15 is connected.
  • An oil separator 16, a pressure control valve 17 and a 2/2-valve 18 are arranged one after the other in the feed line 12. With the pressure control valve 17, the inlet pressure to the pressure vessel 7 is set or varied.
  • the pressure control valve 17 is controlled by a central programmable processor 20.
  • the processor 20 is connected to the pressure control valve 17 via a control line 21 shown in dashed lines. Further control lines 21 shown in dashed lines in the figure connect the processor 20 to the corresponding devices.
  • the 2/2 valve 18 is also connected to the processor 20 via such a control line 21.
  • a connecting line 22 is connected to the line connection 9 and connects to the molded or core box 1 via a 2/2 valve 23 connected is.
  • the connecting line 22 can be a rigid or flexible line, which can also be heated.
  • the valve 23 is connected to a control line 21 with a control device 25, which in turn is connected to the processor 20 via a control line 21.
  • a 2/2-way valve 29 is also arranged in the pressure line 26 and is connected to the control device 25 via a control line 21.
  • the metering pump 27 which can be a membrane pump, for example, the volume of reagents required in each case is conveyed into the pressure line 26 into the pressure vessel 7.
  • the metering pump 27 has a suction line 30 connected to the storage container 2, through which the metering pump 27 draws in the reagent.
  • a suction line 31 of a vacuum pump 33 is connected to the line connection 11 and is driven by an electric motor 34.
  • the motor 34 is connected to the processor 20 via a control line 21. It is also possible to provide a 2/2 valve 31 '(shown in dashed lines) controlled by the processor 20 in the suction line 31, as in the pressure line 26 of the metering pump 27.
  • a pressure measuring device 35 is connected to the pressure vessel 7 and supplies the processor 20 with control signals via a control line 21.
  • the pressure vessel 7 has the task of heating both the compressed air supplied by the pressure source 15 or the compressed gas and to evaporate the volume of reagents supplied by the metering pump 27.
  • a rod-shaped heating element 36 is installed in the interior of the pressure vessel 7, the current-carrying lines 37 of which are connected to the control device 25 for controlling the supplied heating energy.
  • the pressure vessel 7 can be designed in various ways. Heat exchange tubes 38, 39 are arranged in the interior of the pressure vessel 7, of which, however, only one line is shown.
  • the entire interior of the pressure vessel 7 can also be filled with a matrix, for example made of aluminum, for the purpose of heat storage.
  • the cylindrical pressure vessel 7 is at the operating temperature and the molded or core box 1 filled with sand and binder is connected to the connecting line 22.
  • the supply line 12 of the pressure source 15 and the pressure line 26 of the metering pump 27 and the connecting line 22 closed while the vacuum pump 33 is switched on and generates a lower pressure in the pressure vessel 7.
  • This pressure can be monitored and regulated by the pressure measuring device 35.
  • the metering pump 27 delivers a predetermined amount of reagents into the pressure container 7 after opening the valve 29.
  • the reagent evaporates very quickly. Then the valve 18 of the pressure line 12 is opened and compressed air or a compressed gas flows into the pressure vessel 7, the negative pressure of which is changed to an excess pressure in a short time. After the valve 23 is opened, the evaporated reagent is conveyed into the mold or core box 1 by the compressed air or by the pressurized gas, as a result of which the mold or core is cured. After removing the form or core box 1 the mold or core inside must be removed and then refilled with sand and binding agent. During this time, the process is repeated, ie the vacuum pump 33 generates the desired negative pressure in the pressure container 7.
  • the advantage of the described device is that by generating a negative pressure in the cylindrical pressure vessel 7, the boiling point of the amine being conveyed can be significantly reduced, so that amines which have not previously been usable, e.g. the amine TEA triethylamine with a boiling point of 88 ° C can be used. However, this amine is evaporated with less energy and chemical costs than when an amine with a lower boiling temperature, e.g. the amine DMEA dimethylethylamine with 36 ° C boiling point is used in a known plant without vacuum generation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Devices For Molds (AREA)
EP88113769A 1987-10-02 1988-08-24 Verfahren und Vorrichtung zur Herstellung von Giessereiformen und-kernen aus Sand mit einem Bindemittel Expired - Lifetime EP0310802B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88113769T ATE76340T1 (de) 1987-10-02 1988-08-24 Verfahren und vorrichtung zur herstellung von giessereiformen und-kernen aus sand mit einem bindemittel.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3865/87A CH674480A5 (enrdf_load_stackoverflow) 1987-10-02 1987-10-02
CH3865/87 1987-10-02

Publications (2)

Publication Number Publication Date
EP0310802A1 EP0310802A1 (de) 1989-04-12
EP0310802B1 true EP0310802B1 (de) 1992-05-20

Family

ID=4265143

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88113769A Expired - Lifetime EP0310802B1 (de) 1987-10-02 1988-08-24 Verfahren und Vorrichtung zur Herstellung von Giessereiformen und-kernen aus Sand mit einem Bindemittel

Country Status (5)

Country Link
US (1) US5005630A (enrdf_load_stackoverflow)
EP (1) EP0310802B1 (enrdf_load_stackoverflow)
AT (1) ATE76340T1 (enrdf_load_stackoverflow)
CH (1) CH674480A5 (enrdf_load_stackoverflow)
DE (1) DE3871315D1 (enrdf_load_stackoverflow)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH679913A5 (enrdf_load_stackoverflow) * 1989-07-14 1992-05-15 Werner Lueber
US5135043A (en) * 1990-06-25 1992-08-04 Omco Usa, Inc. Apparatus and method for gas curing foundry cores and molds
US5252134A (en) * 1991-05-31 1993-10-12 Stauffer Craig M Integrated delivery system for chemical vapor from non-gaseous sources for semiconductor processing
DE4120928A1 (de) * 1991-06-25 1993-01-07 Unterderweide Gmbh Verfahren zum aushaerten von sandformkoerpern, insbesondere fuer giessereien
DE4318153C1 (de) * 1993-06-01 1994-05-19 Hermann Blachowski Verfahren zum Aushärten einer Gießform aus einem einen Binder enthaltenden Formsand mit einem Gas und Vorrichtung zur Ausübung dieses Verfahrens
US5971056A (en) * 1997-05-27 1999-10-26 Luger GmbH Device for hardening foundry cores and use thereof
GB2333985A (en) * 1998-02-10 1999-08-11 Dean Anthony Jones Casting core production
DE102011050264B4 (de) * 2011-05-11 2015-11-19 Stephanus Bigos Vorrichtung zum Begasen von Gusskernen

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4051886A (en) * 1973-08-27 1977-10-04 Liquid Carbonic Canada Ltd. Saturated liquid/vapor generating and dispensing
US4064926A (en) * 1975-06-16 1977-12-27 Acme-Cleveland Corporation Sand molding apparatus with means for recirculating catalyst
PL191229A1 (pl) * 1976-07-15 1978-01-16 Odlewniczych Fab Mas Sposob utwardzania formierskich mas szybkoutwardzalnych oraz sposob do utwardzania formierskich mas szybkoutwardzalnych
FR2376696A1 (fr) * 1977-01-07 1978-08-04 Stone Wallwork Ltd Perfectionnements a la production sous forme de vapeur ou de gaz d'un reactif ou d'un catalyseur pour un liant organique durcissable
US4362204A (en) * 1980-03-17 1982-12-07 The Mead Corporation Method and apparatus for curing a foundry core
US4312397A (en) * 1980-04-14 1982-01-26 Dependable-Fordath, Inc. Process for forming shell molds
US4483384A (en) * 1980-06-02 1984-11-20 Michel Horst Werner Apparatus for hardening mold parts made of sand for making metal castings
US4540531A (en) * 1984-05-04 1985-09-10 Ashland Oil, Inc. Vapor generator and its use in generating vapors in a pressurized gas
DE3546000A1 (de) * 1985-12-24 1987-06-25 Meppener Eisenhuette Gmbh Verfahren und vorrichtung zum erstellen von formstuecken

Also Published As

Publication number Publication date
EP0310802A1 (de) 1989-04-12
CH674480A5 (enrdf_load_stackoverflow) 1990-06-15
DE3871315D1 (de) 1992-06-25
US5005630A (en) 1991-04-09
ATE76340T1 (de) 1992-06-15

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