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US20040192806A1 - Method and device for the production of molds or cores for foundry purposes - Google Patents

Method and device for the production of molds or cores for foundry purposes Download PDF

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Publication number
US20040192806A1
US20040192806A1 US10/486,475 US48647504A US2004192806A1 US 20040192806 A1 US20040192806 A1 US 20040192806A1 US 48647504 A US48647504 A US 48647504A US 2004192806 A1 US2004192806 A1 US 2004192806A1
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Prior art keywords
mold
core
water
die
foundry
Prior art date
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Abandoned
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US10/486,475
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English (en)
Inventor
Bernd Kuhs
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.)
Dipl-Ing Laempe GmbH
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Dipl-Ing Laempe GmbH
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Filing date
Publication date
Priority claimed from DE10200927A external-priority patent/DE10200927A1/de
Application filed by Dipl-Ing Laempe GmbH filed Critical Dipl-Ing Laempe GmbH
Assigned to DIPL.-ING. LAEMPE GMBH reassignment DIPL.-ING. LAEMPE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KUHS, BERND
Publication of US20040192806A1 publication Critical patent/US20040192806A1/en
Abandoned legal-status Critical Current

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    • 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

Definitions

  • the invention relates to a process for producing molds or cores for foundry purposes from a mixture of foundry sand and binder, in which the foundry sand and binder are mixed and are introduced into a mold or core die, and the binder is then set, imparting the required strength to the mold or core.
  • the invention is based on the object of providing a process of the type described in the introduction, and also a device, which make it possible to produce foundry molds and/or cores which are intended to be highly dimensionally stable and strong even during the casting operation yet can nevertheless be removed from the finished casting in a simple way.
  • the process as defined in the introduction is characterized in that magnesium sulfate is dissolved and/or dispersed in water and mixed as binder with the foundry sand and is then shot or introduced into the mold or core die, and in that the water is then heated inside the mold or core die and is at least partially evaporated and expelled from the mold or core die.
  • the advantages which can be achieved by the invention therefore relate firstly to the foundry mold or cores and the properties thereof during the casting operation, in which harmful gases are not released, and secondly, at a later stage, to the cleaning of the finished casting, which is greatly simplified.
  • the mixture of foundry sand and a dispersion and/or solution of magnesium sulfate in water is heated inside the mold or core die by means of microwave and/or infrared radiators.
  • microwaves can be used in a very targeted fashion and penetrate even into the very middle of relatively large cores.
  • a particularly advantageous procedure can consist in the mixture of foundry sand and a dispersion and/or solution of magnesium sulfate in water being heated inside the mold or core die by the application of an electric voltage to the at least partially electrically conductive parts, which are insulated from one another, of the separable mold or core dies. Electrical energy is available virtually wherever molds or cores are produced, and consequently the heating for expulsion of the water from the mold or the core can be carried out in a correspondingly simple way.
  • the electrically conductive core/mold which consists of a mixture of foundry sand and a dispersion and/or solution of magnesium sulfate in water, may, in a simple and expedient way, be used as an electrical resistor of a resistance heating means and can be heated by means of an electric voltage applied to it and the current which flows as a result. This means that the heat is formed directly where the water is to be expelled.
  • the electric voltage can be applied to electrodes which make contact with the core/mold, and the at least partially electrically conductive parts, which are insulated from one another, of the separable mold or core dies can be used for this purpose.
  • the internal cavities of these dies, which receive the mold or core to be formed, therefore make contact, as electrodes, with the mold or core and provide the corresponding heating, since the mold or core is electrically conductive on account of the wet conditions or moisture and the remaining constituents.
  • an AC voltage is applied as the electric voltage.
  • a pulsed, in particular square-wave voltage can be applied as the electric voltage.
  • a suitable AC voltage can make use of the reactive properties of the sand mixture in the core or mold to heat the latter. Particularly good results can in this case be achieved with the pulsed and in particular square-wave voltages.
  • the voltage can therefore be selected to be controllable and in particular to be greater than 1000 V or greater than 1500 V, in order to achieve correspondingly rapid and powerful heating.
  • the water which has been evaporated as a result of heating is expelled from the die by means of a gaseous medium, such as nitrogen and/or carbon dioxide and/or air, it being possible for this gaseous medium, which is used to expel the evaporated water, to be transported through the die and therefore through the foundry mold or core which has been formed, by means of pressure or by suction and pressure reduction.
  • a gaseous medium such as nitrogen and/or carbon dioxide and/or air
  • air is available in virtually unlimited quantities and can be used without problems to expel water vapor from the die.
  • An expedient configuration of the process may consist in the fact that magnesium sulfate without water of crystallization or with at least one mole of water of crystallization mixed with magnesium sulfate with more than one mole of water of crystallization, if appropriate with up to seven mol of water of crystallization, is dissolved and/or dispersed in water and mixed as binder with the foundry sand, and that the water and some of the water of crystallization are evaporated by heating and then expelled.
  • magnesium sulfate which does not contain any water of crystallization or contains only a small amount of, in particular just one mole of, water of crystallization, when they are reacted with one another with heating, causes the corresponding crystals to become interlaced, which in the application according to the invention contributes to the formation of an extremely strong core or a correspondingly strong mold.
  • An alternative or additional option for reducing the quantity of water or water vapor to be expelled during the process according to the invention may consist in a highly or more highly concentrated solution of magnesium sulfate with or without at least one mole of water of crystallization being mixed with a hydrocolloid, and this mixture being used as binder.
  • the addition of hydrocolloid may make it possible to achieve higher salt concentrations in what is in relative terms a small quantity of dispersion and/or dissolution water, so that a correspondingly reduced amount of water has to be expelled.
  • a further configuration of the process may consist in more magnesium sulfate being mixed with the quantity of dissolution water which is predetermined for a defined quantity of foundry sand than is required to produce a saturated solution, and in some of the magnesium sulfate being dispersed in the solution and mixed with the foundry sand as a dispersion.
  • the foundry sand can be mixed with the dispersed or dissolved binder in a weight ratio of from 97:3 to approximately 80:20.
  • the invention also relates to a device for producing foundry molds or cores, having at least one heating device for setting purposes, wherein the device for producing foundry molds may be a molding machine and the device for producing cores may be a core-shooting machine.
  • This device may be characterized in that at least one microwave generator is installed as heating device on the molding machine or on the core-shooting machine, and in that at least one microwave antenna which is or can be coupled to the microwave generator via a waveguide, is arranged in the region of the mold die for the foundry mold or for the core or cores.
  • a feed opening of a gas purge hood which is known per se can in this case be used for expulsion of gases and/or of heated water vapor.
  • the mold die for the foundry mold or for the core may also be a multi-cavity die in which, by way of example, a plurality of cores are molded and/or heated simultaneously.
  • the device according to the invention may therefore advantageously be formed substantially by a known molding machine or core-shooting machine, which has been additionally equipped with a heating device, specifically with a microwave generator and a microwave antenna. Moreover, it is advantageous if the inlet openings for the foundry sand mixed with binder can be used to expel gases or heated water vapor, so that overall an inexpensive device is available. Even existing core-shooting machines or molding machines may if appropriate be retrofitted in order to allow the advantageous invention and in particular the process according to the invention to be employed therewith.
  • the microwave generator can simultaneously be coupled to the antenna via the waveguide. This makes it possible to simplify actuation of the device, since in practice only one setting movement is required in order to couple the microwave generator to the antenna and to trigger the heating operation.
  • the setting movement to set the device to the gas purge operation may in this case automatically couple the microwave generator to the antenna.
  • the corresponding coupling it is merely necessary for the corresponding coupling to be configured in such a way that closing the gas purge hood or the like simultaneously produces the corresponding coupling of the microwave generator to the antenna.
  • the path of the waveguide can be interrupted and has a coupling at the location where it is interrupted, and that the antenna-side part of the waveguide is optionally arranged on or connected to the gas purge hood or in the die.
  • This coupling can therefore be closed or interrupted, when corresponding movements are carried out, in order to move a gas purge hood into the position of use or to move it back out of this position.
  • a further configuration of the invention for intensifying and accelerating the heating operation may consist in the fact that the microwave generator can be coupled or is connected, via a branched waveguide or via two waveguides, to an antenna arranged in the gas purge hood and to an antenna arranged in the mold die.
  • any water vapor can be expelled during the setting operation.
  • the foundry mold or the core is made from a mixture of foundry sand and a binder which is a dispersed or dissolved magnesium sulfate.
  • the device can be set to the gas purge operation for expulsion of the water vapor formed during the heating operations, as has already been mentioned above.
  • the overall advantageous result is that the molding machine or core-shooting machine and the actual mold dies can remain virtually unchanged, since the existing ventilation systems can also be employed in the device according to the invention and can be used for the expulsion of the heated and evaporated dissolution water in accordance with the invention. It is merely necessary to additionally install an antenna for the microwave, for example on the gas feed hood. In this case, of course, the dies are to be made from materials which are suitable for microwaves.
  • This device having a heating device designed as a microwave generator and an antenna may, however, also be used for the production of molds or cores in which a different binder than the abovementioned dispersed or dissolved magnesium sulfate is used and a heating operation is required to set the binder.
  • Another possibility which is worthy of protection provides a device for producing foundry molds or cores, having at least one heating device for setting purposes, wherein the device for producing foundry molds is a molding machine and the device for producing cores is a core-shooting machine, into which machine a mold or core die can be or is inserted.
  • the heating device provided is an electrical resistance heating means, in which the electrically conductive core or the mold forms the electrical resistor, and the mold or core dies, which are composed of a plurality of parts in order to allow a mold or core to be removed, may be at least partially electrically conductive and may be insulated from one another at the locations where they are in contact with one another, and the parts of the dies may in each case have at least one electrical terminal for application of an electric voltage for the resistance heating device.
  • the molds or cores which initially contain dissolution water and/or water of crystallization and are electrically conductive on account of the further constituents which they contain, can be electrically heated in what is in design terms a very simple way in order for water to be expelled.
  • the moist core or the moist mold constitutes an impedance, resulting in electrical conductivity. The voltage applied thereto can therefore be used for drying purposes.
  • the resistance heating device may have a voltage source with a frequency converter for increasing the frequency and/or a pulse former for forming a pulsed voltage. Good results during heating can be achieved with a pulsed voltage.
  • the resistance heating device may have a voltage source and a transformer for increasing the voltage, which are connected, via supply conductors, to the terminals on the parts of the mold or core die. This makes it possible to increase efficiency.
  • At least one part of the mold or core die may have a plurality of electrical terminals, and switches for alternately or optionally applying a voltage to these terminals may be provided between the terminals and the voltage source, so that alternately one switch is closed and the others are open. This means that any polarities which occur at an electrode can always be reduced again and/or altered.
  • the heating of a mold or core can be carried out correspondingly uniformly, and even very differing contours of molds or cores of this type can be taken into account by changing the electrical terminals which are active at any given time.
  • each part may have an electrical terminal and electrical supply conductors, and in each case two parts, cyclically, of a die of this type can always be connected to the current source.
  • Multipart dies of this type are often required in particular for complicated cores. Nevertheless, with the abovementioned configuration it is possible to use the applied voltage in each case to form a resistance heating means so that the core is thoroughly heated.
  • the overall result is a process and a device which allow mechanical production of molds or cores in standard core-shooting machines, and wherein the mold sand can set within about half a minute.
  • the process makes use of the extremely different melting points of magnesium sulfate in its hydrated form, on the one hand, and in its anhydrous state, on the other hand.
  • magnesium sulfate in the form of its heptahydrate has a melting point of approximately 75° Celsius and in its anhydrous form has a melting point of 1124° Celsius. Therefore, by targeted removal of the chemically bonded water of crystallization, it is possible to achieve virtually instantaneous setting of the mold sand.
  • the important ventilation for removal of the water of crystallization, which was originally chemically bonded, after heating may if appropriate be effected through specially arranged inlet and outlet nozzles, in which case a superatmospheric pressure of 1 to 6 bar of a dry gas, preferably of heated air, is expedient.
  • the heating may expediently be effected using microwaves, since the quartz sand which is normally used is “transparent” to microwave radiation, so that such radiation can penetrate all the way through even relatively large molds or cores.
  • only the magnesium sulfate which contains water of crystallization is heated. As soon as the water of crystallization has escaped, this magnesium sulfate, which is now anhydrous, is also “transparent” and no longer presents any obstacle to the further penetration of the microwaves.
  • the heating may expediently also be effected by resistance heating, as has been explained above.
  • the targeted removal of even the chemically bonded water of crystallization—at least in part—from the magnesium sulfate is essential. This leads to very rapid setting, which is advantageous for economically viable production. Moreover, sufficient strength is achieved with a relatively low concentration of magnesium sulfate.
  • the mold parts or cores produced in this way are dimensionally stable up to at least 1124° Celsius and can be dissolved out of the metal casting using a small amount of water.
  • FIG. 1 shows a schematic illustration of a device for producing foundry molds or cores, having a microwave generator and corresponding antenna, in the form of a core-shooting machine
  • FIG. 2 shows, on an enlarged scale and in even more schematic form, a longitudinal section through part of the shooting unit after sand has been shot into a mold die formed as a core box and before this core box is moved to meet a purge hood located above it and is pressed onto the shooting head from below, or vice versa, with the microwave antenna for heating the core and expelling the dissolution water being arranged in this purge hood; the connection between the microwave generator and this emitting antenna is still open and can be closed automatically when the parts are moved together or lifted and pressed together,
  • FIG. 3 shows an illustration corresponding to FIG. 2, with the emitting antenna arranged in the lower region of the core box designed as a mold die,
  • FIG. 4 shows an embodiment which has been modified with respect to FIGS. 2 and 3 in a similar form of illustration; in this case, an antenna which is or can be coupled to the microwave generator in the position of use for heating the shot core is arranged in both the purge hood and the core box,
  • FIG. 5 shows an illustration corresponding to FIGS. 2 to 4 of a modified embodiment, in which infrared radiators for heating the shot core are arranged in the core box,
  • FIG. 6 shows an illustration corresponding to FIGS. 2 to 5 of a modified embodiment, in which the heating device provided is an electrical resistance heating means, in which the mold for the electrically conductive core is likewise electrically conductive and its parts are insulated at the locations where they are in contact, and an electrical terminal for a resistance heating device is provided at each part of the mold or core dies,
  • FIG. 7 shows an arrangement and device corresponding to FIG. 6, in which a plurality of electrical terminals, which can be connected up optionally and alternately in switches, in order to avoid polarization at one of the terminals, are provided on one of the parts of the die for the core,
  • FIG. 8 shows a further modified device, in which the core die comprises three electrically conductive parts which are insulated from one another and each of which has an electrical terminal, it being possible for in each case two of the three parts alternately to be connected to the voltage source via switches, and
  • FIG. 9 shows an embodiment and arrangement corresponding to FIG. 6, in which, however, the sequence of the voltage transformer and the pulse former located behind the voltage source is reversed compared to the arrangement shown in FIG. 6.
  • a device which is denoted overall by 1 and is illustrated diagrammatically and partially cut away in FIG. 1 is used to produce cores, but could also be employed to produce foundry molds.
  • the device is a core-shooting machine.
  • the cores 2 which are to be produced with it (FIGS. 2 to 9 )—or by analogy foundry molds—are molded from a mixture 3 of foundry sand and binder, which is a magnesium sulfate which is dissolved in water and preferably includes at least one mole of water of crystallization, or alternatively is some other form of binder, this mixture 3 of sand and binder being introduced into a sand feed funnel 4 in a known way and as a result being introduced into the shot head 5 of a shooting unit denoted overall by 6.
  • FIG. 1 also illustrates the air boiler 7 , which is essential to the shooting operation, in partially cut-away form.
  • the core box 8 which is illustrated in each of FIGS. 2 to 9 and is assembled from a core box upper part 8 a and a core box lower part 8 b in the position of use, but could also be a correspondingly differently configured mold die if foundry molds are to be produced, belongs to this device 1 in the form of a core-shooting machine.
  • FIG. 8 shows an embodiment in which the core box upper part 8 a is in turn subdivided in order to allow the removal of a correspondingly complicated core after it has set.
  • the binder in this case is magnesium sulfate preferably with at least one mole of water of crystallization dissolved and/or dispersed in water, and this binder is then mixed with the foundry sand to form the mixture 3 . This mixture is then introduced or shot into the mold or core die 8 .
  • the core box 8 the dispersing and/or dissolution water and at least some of the water of crystallization is evaporated by heating and expelled from the mold or core die, i.e. from the core box 8 , by means of a gaseous medium.
  • At least one heating device which is to be described in more detail below and can be used to heat and expel the dissolution water and/or the water of crystallization, is provided on the molding or core-shooting machine 1 .
  • a microwave generator 9 is installed on the core-shooting machine 1 as heating device, and at least one microwave antenna 10 , which can be coupled, and in the position of use is coupled, to the microwave generator 9 via a waveguide 11 , is arranged in the region of the mold die, i.e. of the core box 8 , at different locations depending on the particular exemplary embodiment.
  • the corresponding coupling 12 is still open, since although a core 2 has already been shot, the core box 8 has not yet been brought to meet a gas purge hood 13 and the heating and setting by means of microwave have not yet been carried out.
  • a feed opening 14 which can be used, for example, to introduce hot air in order to expel the heated water or water vapor which is formed as a result of the heating with the aid of the heating device, i.e. the microwave 9 in the position of use.
  • connection between microwave generator 9 and antenna 10 is still open.
  • Setting the device 1 to the gas purge operation for expulsion of the water vapor i.e. the relative lifting motion of the core box 1 with respect to the gas purge hood 13 and with respect to the shooting head 5 or vice versa simultaneously allows the microwave generator 9 to be coupled to the antenna 10 via the waveguide 11 by virtue of the coupling 12 being closed during the abovementioned relative movement.
  • the movement of setting to the gas purge operation can automatically couple the microwave generator 9 to the antenna 10 , so that the entire operation can be carried out quickly.
  • the path of the waveguide 11 can therefore be interrupted, and the abovementioned coupling 12 is provided at the location where it is interrupted, it being possible for the antenna-side part of the waveguide 11 optionally to be arranged and connected at the gas purge hood 13 , as shown in FIG. 2, or in the mold die or core box 8 , as shown in FIG. 3, or even at both locations, as shown in FIG. 4.
  • FIG. 2 shows the path of the waveguide 11
  • the microwave generator 9 can be coupled and is connected, via two waveguides 11 , to an antenna 10 arranged in the gas purge hood 13 and an antenna 10 arranged in the mold die or core box 8 , so that the foundry mold or the core 2 can be heated correspondingly quickly and powerfully and the time required to expel the dissolution water and/or water of crystallization can be shortened.
  • FIG. 5 shows a modified embodiment, in which infrared radiators 15 are provided as the heating device at or in the mold die, in this case in the core box 8 ; the infrared radiators 15 may be provided as an alternative to heating by means of microwave or even in addition to heating by means of microwave, for example if an antenna 10 as shown in FIG. 2 were additionally to be provided in the gas purge hood.
  • FIGS. 6 to 9 in turn show modified embodiments in which the heating device provided is an electrical resistance heating means, in which the electrically conductive core 2 forms the electrical resistance.
  • the core die 8 which for removal of a core 2 once again is composed of two parts (FIGS. 6, 7 and 9 ) or three parts (FIG. 8), is in this case at least partially, or expediently completely, electrically conductive, by virtue of it consisting, for example of aluminum or cast iron or steel.
  • the parts 8 a and 8 b are insulated from one another, and this insulation 16 is diagrammatically depicted in FIGS. 6 to 9 .
  • the parts 8 a and 8 b of the dies or of the core box 8 each have an electrical terminal 17 for application of an electric voltage for the resistance heating device.
  • the core box upper part 8 a and core box lower part 8 b i.e. the parts of the core die 8 , therefore belong to the resistance heating means, wherein the core 2 forms the actual resistor.
  • this resistance heating device has a voltage source 19 , which in the present case leads through a three-phase network 20 to a frequency converter for increasing the frequency and/or a pulse former 21 for forming a pulse voltage.
  • this resistance heating device has a transformer 22 for increasing the voltage, from which supply conductors 23 lead to the terminals 17 on the parts 8 a and 8 b of the core die 8 .
  • the moist core 2 inside the die 8 acts as a corresponding resistor or as an impedance, so that current flows in order to dry the core.
  • the level of the voltage can be selected according to the thickness of the core 2 .
  • Very intensive and effective drying is achieved since the parts 8 a and 8 b act as electrodes which bear against and make contact with the core and to which the electric voltage is applied, these “electrodes” 8 a and 8 b being isolated from one another by the insulation 16 in order to avoid a short circuit.
  • the electric voltage may expediently be a sinusoidal or pulsed, in particular square-wave voltage, with an AC voltage of high frequency of over 1000 Hz, for example of 3000 Hz or even above, being particularly effective. It is also possible for the voltage to be controlled and to be selected to be greater than 1000 V. By changing the pulse width of the electric voltage, it is possible to control or regulate the introduction of power and to match it to the shape and size of a core 2 , and in the case of a mold being produced in a mold die, to the mold.
  • FIG. 7 reveals four electrical terminals 17 of this type on the core box lower part 8 b , these terminals being connected in parallel, and switches 24 for alternately or optionally applying a voltage to the various electrical terminals 17 being provided between these terminals 17 and the voltage source 19 , in which case alternately one switch 24 is closed and the others are open.
  • switches 24 for alternately or optionally applying a voltage to the various electrical terminals 17 being provided between these terminals 17 and the voltage source 19 , in which case alternately one switch 24 is closed and the others are open.
  • FIG. 8 shows an embodiment in which the core die 8 is composed of more than two parts, the core box upper part 8 a for its part being subdivided into two parts, which parts are electrically isolated from one another by an insulation 25 . This makes it possible to produce correspondingly complicated cores 2 .
  • FIG. 8 illustrates that each of these three parts has an electrical terminal 17 and an electrical supply conductor 23 , which is initially composed of two parallel sections 23 a and 23 b in which switches 26 are arranged.
  • These parallel-connected sections 23 b enable in each case two parts 8 a or 8 b , cyclically, of a multiply divided die 8 of this type to be connected to the voltage source 19 by the switches 26 being opened and closed cyclically. Therefore, in each case only two parts of the core box 8 are energized, cyclically, in order for the core 2 which is present therein to be used as a resistor and heated.
  • FIGS. 6 to 9 there is a gas purge hood 13 having a feed opening 14 , by means of which, by way of example, hot air can be introduced in order to expel the heated water or water vapor which is formed as a result of the heating with the aid of the electric voltage in the position of use.
  • the gas purge hood 13 can be moved in the same way as in the exemplary embodiments described above in order for the gas purge operation to be carried out.
  • a gaseous medium for example nitrogen and/or carbon dioxide and/or air, preferably hot air or hot gas, can be supplied via the feed opening 14 in order to expel the evaporated water. Therefore, the expulsion of the evaporated water can best be effected by means of superatmospheric pressure.
  • the mixture 3 contains, as binder, magnesium sulfate, without and/or with one mole or if appropriate more than one mole of water of crystallization, dissolved in water.
  • magnesium sulfate without any water of crystallization, with one mole of water of crystallization and magnesium sulfate with more than one mole of water of crystallization and/or also mixed with a hydrocolloid, as binder.
  • magnesium sulfate or magnesium sulfate with hydrocolloid are used, since magnesium sulfate with water of crystallization can be successfully dissolved and/or dispersed in water and mixed as binder with foundry sand, but also can subsequently be successfully dissolved out of a cast workpiece again with the aid of water.
  • foundry sand According to one example of an expedient mixture of foundry sand and dispersed or dissolved binder, it is possible for approximately 100 parts by weight of foundry sand to be mixed with approximately 3 parts by weight to approximately 20 parts by weight of dissolved binder, in particular comprising magnesium sulfate in dissolved form.
  • a mixture 3 of foundry sand and binder is produced and introduced, for example shot in a core-shooting machine, into a mold or core die 8 .
  • a known binder or magnesium sulfate without any water of crystallization and/or with at least one mole or alternatively more than one mole of water of crystallization dissolved or dispersed in water is used as binder and mixed with the foundry sand and introduced or shot into the mold die or the core box 8 .
  • the water and some of the water of crystallization is then evaporated by heating and expelled by means of a gaseous medium, an operation which can be carried out very quickly.
  • a core of this type or a mold of this type consisting of foundry sand can very quickly be dissolved out of the workpiece and flushed out by means of water, since the magnesium sulfate retains its ability to be dissolved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Mold Materials And Core Materials (AREA)
US10/486,475 2001-08-10 2002-07-16 Method and device for the production of molds or cores for foundry purposes Abandoned US20040192806A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10138287.1 2001-08-10
DE10138287 2001-08-10
DE10200927A DE10200927A1 (de) 2001-08-10 2002-01-12 Verfahren und Vorrichtung zur Herstellung von Formen oder Kernen für Giessereizwecke
DE10200927.9 2002-01-12
PCT/EP2002/007885 WO2003013761A1 (fr) 2001-08-10 2002-07-16 Procede et dispositif de production de moules ou de noyaux utilises en fonderie

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US (1) US20040192806A1 (fr)
EP (1) EP1417061A1 (fr)
JP (1) JP2005508252A (fr)
CN (1) CN1538887A (fr)
CA (1) CA2457588A1 (fr)
EA (1) EA005362B1 (fr)
MX (1) MXPA04001086A (fr)
WO (1) WO2003013761A1 (fr)

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CN112157248A (zh) * 2020-09-25 2021-01-01 樊锟 一种覆膜砂铸造模具
US11192173B2 (en) 2017-10-17 2021-12-07 Magma Giessereitechnologie Gmbh Core shooting apparatus and method for controlling core shooting apparatus
US11958103B2 (en) 2018-07-09 2024-04-16 Kao Corporation Inorganic coated sand

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KR101141849B1 (ko) 2010-04-23 2012-05-07 (주)대보스틸 주조용 보강틀
CN103302231A (zh) * 2013-06-20 2013-09-18 重庆长江造型材料（集团）股份有限公司 一种水基型粘结剂湿态型芯的固化方法
ES2550337T3 (es) * 2013-09-11 2015-11-06 Lüber GmbH Dispositivo y procedimiento para el endurecimiento de núcleos de fundición
CN105562613B (zh) * 2014-10-10 2018-02-13 咸阳勃力模具制造有限公司 一种航空发动机多孔层板发散冷却涡轮叶片陶瓷型芯一次成型的方法
WO2017152348A1 (fr) * 2016-03-07 2017-09-14 苏州明志科技有限公司 Machine de fabrication de noyau dotée d'une fonction de durcissement par micro-ondes intégrée
DE202018106268U1 (de) 2018-11-04 2018-11-28 Wolfram Bach Werkzeug zur Herstellung von Formen oder Kernen durch elektrische Widerstandserwärmung eines kunststoffbasierten Materials
DE102020209100B4 (de) 2020-07-21 2024-05-23 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eingetragener Verein Verfahren zur Herstellung von Sandkernen, die für Gießereizwecke einsetzbar sind
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