EP0310802A1 - Procédé et dispositif pour la fabrication de noyaux et moules de fonderie en sable, utilisant un liant - Google Patents

Procédé et dispositif pour la fabrication de noyaux et moules de fonderie en sable, utilisant un liant Download PDF

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Publication number
EP0310802A1
EP0310802A1 EP88113769A EP88113769A EP0310802A1 EP 0310802 A1 EP0310802 A1 EP 0310802A1 EP 88113769 A EP88113769 A EP 88113769A EP 88113769 A EP88113769 A EP 88113769A EP 0310802 A1 EP0310802 A1 EP 0310802A1
Authority
EP
European Patent Office
Prior art keywords
reagent
container
sand
binder
cores
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
EP88113769A
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German (de)
English (en)
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EP0310802B1 (fr
Inventor
Franz Gähler
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.)
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/fr
Application granted granted Critical
Publication of EP0310802B1 publication Critical patent/EP0310802B1/fr
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 process for the production of foundry molds and cores from foundry sand with a binder, in which a reagent is supplied to the sand in the housing with the binder with the aid of a carrier air stream, through which the sand cures to a dimensionally stable shape or a dimensionally stable core becomes.
  • Processes for producing foundry molds and cores according to the so-called cold box process are known in various embodiments.
  • the process essentially consists of mixing the foundry sand with a binder.
  • the sand prepared in this way is introduced into a housing designed as a mold or core.
  • a reagent e.g. a catalyst is introduced into the housing in a carrier air stream, whereby a reaction takes place between the binder and the reagent, by means of which the shape is converted into a dimensionally stable body.
  • reagents e.g. Catalysts in the form of amines of various types are used.
  • the process has undergone various improvements over time, particularly the preheating of the reagent and the carrier air, an acceleration in the manufacture of the molds and which results in cores.
  • the reagent which is normally liquid, must be converted into a gaseous state so that the sand hardens uniformly at all points. This has been achieved primarily by heating the carrier air and the reagent.
  • a particular disadvantage of this method is that the use of amines as reagents means that considerable odor nuisance for the operating personnel of corresponding systems cannot be avoided. These amines have different boiling points and accordingly the odor is different. The higher the boiling point of the amine is selected, the lower the odor nuisance. However, it is disadvantageous that in the case of such amines with a higher boiling point the evaporation does not take place quickly enough, so that its distribution in the sand can vary, which means that the quality of the shape or of the core is achieved.
  • the reagent is introduced into an underpressure zone or into an evacuated container and evaporated there, whereupon the reagent is then immediately introduced into the housing containing sand and binder by means of an air stream.
  • the reagent is preferably introduced into a heated vacuum zone or a heated container. Due to the formation of negative pressure and simultaneous heating of the reagent and the carrier air - it is also possible to use a carrier gas, for example carbon dioxide Co2 or nitrogen N2 - the evaporation of the reagent is accelerated or a reagent with a correspondingly higher boiling point can be used.
  • the vacuum zone is expediently designed as a closed space which is evacuated before the reagent is introduced and is then brought to overpressure by compressed air or a compressed gas. Since the transition from a negative pressure prevailing in relation to the atmosphere to a corresponding positive pressure, which can be carried out quickly and the housing can also be acted upon in a very short time, recondensation of the reagent is reliably avoided.
  • the invention also includes a device which has the task of optimally executing the method according to the invention.
  • a container equipped with a heating element and provided with a supply line and discharge line for compressed air or a compressed gas as well as a supply line for the supply of the reagent has a connection for a vacuum pump which can be switched on and off.
  • the container is expediently designed as a standing cylinder with a container length that is a multiple of the container diameter, the mouth of the feed line for the reagent being arranged in the region of the container base.
  • FIG. 1 An embodiment of the invention is shown in the drawing and described below.
  • the figure shows a circuit diagram of a plant for the production of foundry molds and cores according to the invention.
  • 1 denotes a housing 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 reagent container 2.
  • the container 2 expediently holds such an amount that it covers a daily requirement.
  • the stock in the container 2 can expediently be 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 reagent container 2 has a feed line 4, which can be closed and opened by a 2/2 valve (with two switching positions and two connections). Through the feed line 4, the reagent can be transferred from a reserve container 6 into the reagent container 2.
  • An essential part of the system shown in the figure is a standing, cylindrical container 7.
  • the container 7 has a number of line connections 8-11.
  • a compressed air or compressed gas supply line 12 ends, at the beginning of which a pressure wave 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.
  • 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 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 housing 1 via a 2/2-way 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 pressure line 26 of a metering pump 27 opens, which is driven by an electric motor which is connected to the control device 25 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 cylindrical container 7.
  • the metering pump 27 has a suction line 30 connected to the reagent container, 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 (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 cylindrical container 7 and supplies the processor 20 with control signals via a control line 21.
  • the cylindrical container 7 has the task of heating both the compressed air supplied by the pressure wave 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 cylindrical container 7, the current-carrying lines 37 of which are connected to the control device 25 for controlling the supplied heating energy.
  • the cylindrical container 7 can be designed in various ways. In the interior of the container 7, heat exchange tubes 38, 39 are arranged, of which only one line is shown. The entire interior of the cylinder 7 can also be filled with a matrix, for example made of aluminum, for the purpose of heat storage.
  • the cylindrical container 7 is at operating temperature and a housing 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 are closed, while the vacuum pump 33 is switched on is and generates a smaller pressure in the container 7.
  • This pressure can be monitored and regulated by the pressure measuring device 35. After the desired negative pressure has been reached, a predetermined amount of reagents is conveyed into the container 7 by the metering pump 27 after the valve 29 has been opened.
  • 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 container 7, the negative pressure of which is changed to an excess pressure in a very short time. After the valve 23 is opened, the vaporized reagent is conveyed into the housing 1 by the compressed air or by the compressed gas, as a result of which the mold or core is cured. After removing the housing 1 the mold or core inside must be removed and the housing 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 container 7.
  • the advantage of the system described is that by generating a negative pressure in the cylindrical container 7, the boiling point of the amine being conveyed can be significantly reduced, so that amines which were not previously usable, e.g. the amine TEA triethylamine with a boiling point of 88 ° C can be used. Evaporation of this amine, however, takes place 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 Procédé et dispositif pour la fabrication de noyaux et moules de fonderie en sable, utilisant un liant Expired - Lifetime EP0310802B1 (fr)

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 (fr) 1987-10-02 1987-10-02
CH3865/87 1987-10-02

Publications (2)

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

Family

ID=4265143

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88113769A Expired - Lifetime EP0310802B1 (fr) 1987-10-02 1988-08-24 Procédé et dispositif pour la fabrication de noyaux et moules de fonderie en sable, utilisant un liant

Country Status (5)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991001189A1 (fr) * 1989-07-14 1991-02-07 Lueber Werner Procede et dispositif pour le durcissement de noyaux de fonderie
EP0587724A1 (fr) * 1991-05-31 1994-03-23 Craig M Stauffer Systeme integre d'alimentation en vapeur chimique a partir de sources non gazeuses pour le traitement de semi-conducteurs.

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5135043A (en) * 1990-06-25 1992-08-04 Omco Usa, Inc. Apparatus and method for gas curing foundry cores and molds
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
WO1999043456A2 (fr) * 1998-02-10 1999-09-02 Dean Anthony Jones Dispositif de chauffage pour substances gazeuses, et production de noyaux a l'aide dudit dispositif de chauffage
DE102011050264B4 (de) * 2011-05-11 2015-11-19 Stephanus Bigos Vorrichtung zum Begasen von Gusskernen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2526875B1 (de) * 1975-06-16 1976-12-16 Acme Cleveland Corp Verfahren und vorrichtung zum aushaerten von sandformen oder sandkernen
DE2731530A1 (de) * 1976-07-15 1978-01-19 Odlewniczych Fab Mas Verfahren und vorrichtung zum haerten von schnellerhaertenden formsanden
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
DE3546000A1 (de) * 1985-12-24 1987-06-25 Meppener Eisenhuette Gmbh Verfahren und vorrichtung zum erstellen von formstuecken

Family Cites Families (5)

* 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
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2526875B1 (de) * 1975-06-16 1976-12-16 Acme Cleveland Corp Verfahren und vorrichtung zum aushaerten von sandformen oder sandkernen
DE2731530A1 (de) * 1976-07-15 1978-01-19 Odlewniczych Fab Mas Verfahren und vorrichtung zum haerten von schnellerhaertenden formsanden
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
DE3546000A1 (de) * 1985-12-24 1987-06-25 Meppener Eisenhuette Gmbh Verfahren und vorrichtung zum erstellen von formstuecken

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991001189A1 (fr) * 1989-07-14 1991-02-07 Lueber Werner Procede et dispositif pour le durcissement de noyaux de fonderie
EP0587724A1 (fr) * 1991-05-31 1994-03-23 Craig M Stauffer Systeme integre d'alimentation en vapeur chimique a partir de sources non gazeuses pour le traitement de semi-conducteurs.
EP0587724A4 (en) * 1991-05-31 1994-06-01 Craig M Stauffer Integrated delivery system for chemical vapor from non-gaseous sources for semiconductor processing

Also Published As

Publication number Publication date
ATE76340T1 (de) 1992-06-15
CH674480A5 (fr) 1990-06-15
US5005630A (en) 1991-04-09
DE3871315D1 (de) 1992-06-25
EP0310802B1 (fr) 1992-05-20

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