CN1538887A - Method and device for production of molds or cores for foundry purposes - Google Patents
Method and device for production of molds or cores for foundry purposes Download PDFInfo
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- CN1538887A CN1538887A CNA02815469XA CN02815469A CN1538887A CN 1538887 A CN1538887 A CN 1538887A CN A02815469X A CNA02815469X A CN A02815469XA CN 02815469 A CN02815469 A CN 02815469A CN 1538887 A CN1538887 A CN 1538887A
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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
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Abstract
The invention relates to the production of molds or cores (2) for foundry purposes, wherein a mixture (3) of foundry sand and binder are produced and introduced into a mold or core tool (8), e.g. shot in a core shooter. A known binder or magnesium sulfate with and/or without at least one or additionally several crystallization waters is dispersed or dissolved in water and used as binder, which is then mixed with the foundry sand and introduced or shot into the mold tool or the core box (8). For hardening purposes, the water and a fraction of the crystallization water are vaporized by heating and driven out by a gaseous medium, all of which can be carried out very rapidly. After pouring, said core or mold consisting of foundry sand can be very rapidly removed from the tool with water and flushed due to the fact that the magnesium sulfate preserves its capability of dissolving.
Description
Technical field
The present invention relates to cast the mould of usefulness or the method for core with a kind of mixture manufacturing of forming by molding sand and binding agent, wherein, molding sand and binding agent mixed and be entered into a moulding or make in the core instrument, then binding agent age-hardening and give mould or intensity that core is essential.
Background technology
In the manufacturing of the core of casting usefulness or mould, such processing is known.Utilize organic binder bond under the situation that the overwhelming majority passes through at present, it produces good age-hardening, but produces gas because it burns in casting process, and this gas may cause the formation of shrinkage cavity in the foundry goods of formation.In addition, especially core expands, and it does not have enough shape stabilities under the temperature that improves in such molding sand mixture.Because the bigger bonding tendency of organic binder bond, the expending of cleaning that is used for the instrument of mold or core also is very big.
Being considered to especially disadvantageously, mainly is that the core that its sand mixture comprises organic binder bond can only be removed from the foundry goods made from expense bigger difficulty and high machinery or heat.
Therefore also suggestion is once adopted inorganic binder, i.e. waterglass in order to mix with sand when the mould of making casting usefulness or core.Though can avoid the generation of the gas of hostile environment whereby to the full extent, be shaped in this case or particularly the elimination of core from the foundry goods of making also be difficulty and expend very big.
Summary of the invention
Therefore the objective of the invention is to, a kind of method and device that starts described pattern is provided, borrow it can make mold and/or core, they also should have high shape stability and intensity in casting process, but still can remove from the foundry goods of making in a simple manner.
In order to reach this purpose, starting described method is characterised in that, magnesium sulfate disperseed and/or be dissolved in the water and mix with molding sand as binding agent, import or be injected into moulding then or make in the core instrument and in moulding or make in the core instrument water heated and it is evaporated at least in part and with it from moulding or make the core instrument and get rid of.
Experiment shows; can produce a kind of stable core or a kind of stable mould by such method; wherein by selected binding agent and water and in this case at least a portion improve its fusing point greatly from the eliminating of the crystallization water of the magnesium sulfate of aquation; thereby also the high temperature of anti-founding materials and hold mode are constant again for such mold or such core, and wherein do not discharge harmful gas.Wherein make the present invention usefully, produce the binding agent of special use, the i.e. chemical change of the material character of magnesium sulfate by the eliminating of the crystallization water.
Show; such mold or core can wash away by water after the foundry goods cooling; because special-purpose binding agent still has such tendency; promptly absorb the crystallization water and therefore chemically becoming a soluble material again again; thereby the dissolving of its available such purge or rinse water also also can be removed from the foundry goods of complexity very simply, and does not need the expense of mechanical oscillation etc.Even may be enough be that the foundry goods of making is immersed in the water-bath simply.Show,, so soakedly can only treat that half a minute is just enough even for the core that dissolves and one of flush away is complicated.In addition, in fact molding sand can be supplied with use as before and not need to expend very big purification and processing after this, because there is not the necessary organic residue of eliminating.
Therefore relate in one aspect to mold or core and its character in casting process by the accessible advantage of the present invention, wherein do not discharge harmful gas, and relate to the cleaning of the later foundry goods of making on the other hand, it has been simplified significantly.
What conform with purpose is, in moulding or make in the core instrument, by means of microwave and/or infrared radiation source, to by molding sand and a kind of magnesium sulfate in water dispersion and/or the mixture of solution composition heat.This constitutes a special simple heating mode in order to eliminating water and at least a portion crystallization water in this case.Microwave can be utilized in this case very targetedly and the most crucial part of bigger core can be penetrated.
One particularly advantageous processing mode may be, in moulding or make in the core instrument, by in separable moulding or make on each parts of mutually insulated of partially conductive at least of core instrument and apply voltage, to by molding sand and a kind of magnesium sulfate in water dispersion and/or the mixture of solution composition heat.Electric energy in fact can be for the use Anywhere at mfg. moulding die or core, thereby can correspondingly implement heating easily so that get rid of water from mould or core.
Will by molding sand and a kind of magnesium sulfate in water dispersion and/or the core/mould of the conduction that constitutes of the mixture of solution composition with simple and mode that conform with purpose heats it as the resistance of resistance heated and by voltage that applies thereon and the electric current that flows through.Therefore can directly produce heat in the place that should get rid of water.
Voltage can be applied on the electrode of contact core/mould and can adopt separable moulding for this reason or make each parts of mutually insulated of the partially conductive at least of core instrument.Its inner chamber that holds mould to be formed or core to be formed is therefore as electrode contact mould or core and corresponding heating is provided because mould or core through moisture or humidity and remaining composition conduct electricity.
Particularly advantageous is to apply a kind of alternating voltage as voltage.Wherein as voltage can apply a kind of pulse form, the voltage of rectangle particularly.One suitable alternating voltage can be used for the response characteristic of the sand mixture in core or the mould its heating.Utilize in this case pulse form and particularly the voltage of rectangle can give especially good results.Particularly might be by pulse width control or the adjusting input power that changes voltage.Therefore voltage is adjustable and can selects greater than 1000V or greater than 1500V especially, so that reach corresponding quick and strong heating.
When selecting to have, for example during the alternating voltage of 3000Hz or higher frequency, can in short-term, reach good entire body drying above 1000Hz.Because whole core case or make core or molder tool is used as electrode surface, can be very fast and transmit energy and therefore can be effectively at extremely short corresponding core of time inner drying or corresponding mould.
What conform with purpose may be; water that will be by heating evaporation is got rid of from instrument by means of a kind of gaseous medium such as nitrogen and/or carbon dioxide and/or air, wherein this gaseous medium that is used for draining can utilize pressure or by means of sucking-off and negative pressure by instrument and therefore carry by the mold that forms or by core.Particularly air is available in fact without restriction and can be used for getting rid of water vapour from instrument in no problem ground.
In this case advantageously, utilize the air scavenge of heat by heating the water vapour that in instrument, produces.Can avoid whereby, water vapour to be got rid of may be prematurely condensation or only heat this water vapour a little and just can be enough to can to the full extent it be got rid of from instrument subsequently again.
The form of implementation that one of method conforms with purpose may be, the magnesium sulfate of will be not or having at least one crystallization water with have more a plurality of crystallizations water, have the magnesium sulfate that reaches seven crystallizations water in case of necessity and mix mutually and disperse and/or be dissolved in the water and mix mutually with molding sand as binding agent, and make water and the evaporation of a part of crystallization water also then with its eliminating by heating.
Can reduce the water yield to be got rid of in surprising mode whereby.Because not having or only have not, the magnesium sulfate of a plurality of crystallizations water can be absorbed by the magnesium sulfate that comprises more multi-crystallization water of such crystallization water in heating process; thereby it causes the corresponding crystal formation in mold or core and causes corresponding reinforcement, and needn't get rid of the crystallization water of whole mixtures.
Known, not or have magnesium sulfate few, that particularly only have a crystallization water and the magnesium sulfate with more a plurality of crystallizations water and impel each crystal combination to be in the same place when heating reacting to each other, these crystal help to form a firm especially core or a corresponding firm mould in according to application of the present invention.Another or additional possibility, be to carry out in the process in the inventive method, reduce the amount of water or water vapour to be got rid of, in this can with not or the high or higher solution that concentrates with magnesium sulfate of at least one crystallization water mix mutually with a kind of hydrocolloid and this mixture be used as binding agent.The interpolation of hydrocolloid can realize, can reach higher salinity with the disperse water and/or the dissolving water of less amount, thereby the water that must get rid of is correspondingly few.
Another form of implementation of method may be, will mix mutually with the dissolving water yield that is given for a certain amount of molding sand than the needed more magnesium sulfate of saturated solution, and a part of magnesium sulfate is scattered in the solution and as dispersion and mixes with molding sand.Realize whereby, magnesium sulfate as much as possible is entered in the molding sand and to the requirement of dissolving water as binding agent keep so few as far as possible, so that the water vapour that must get rid of is also correspondingly few subsequently.After remaining on simultaneously when foundry goods is removed the molding sand residue by means of simple water purge or soaked advantage.
Molding sand can mix with binding agent that disperse or dissolving mutually by weight 97: 3 to about 80: 20.
What conform with purpose is, with the molding sand of about 100 weight deals and about 3 weight deals binding agent dispersion or dissolving to about 20 weight deals, that is the magnesium sulfate of dissolving and/or be not with the crystallization water, mix mutually.In this case, a processing mode of optimizing may be, the binding agent of about 5 to 10 weight deals is mixed with the sand facies of about 100 weight deals with form that disperse or dissolving.Experiment shows that this causes firm core or mold, and it can keep good state constant and wherein need only get rid of the least possible water from instrument in casting process.
The invention still further relates to a kind of device in order to manufacturing mold or core, comprise at least one heater in order to age-hardening, wherein, the device of making mold can be a moulding machine, and the device of manufacturing core can be a core shooter.The feature of these devices can be; at least one microwave generator is being installed as heater and be used for mold or be used in the zone of molder tool of core at least one microwave antenna being set on moulding machine or the core shooter, it can couple or be connected with microwave generator via a waveguide.Wherein the air admission hole of known gas blow-washing lid itself can be used to get rid of the water vapour of gas and/or heating.
Be noted that in this respect the molder tool that is used for mold or is used for core also can be many instruments, wherein for example be shaped simultaneously and/or heat a plurality of cores.
Therefore, device of the present invention can be made of a known so far moulding machine or a core shooter in an advantageous manner to the full extent, its additional outfit one heater, that is a microwave generator and a microwave antenna.In addition advantageously, for the water vapour of getting rid of gas or heating can adopt the hole that enters that is used for the molding sand that mixes with binding agent, thereby a device that is worth is available generally.Same existing core shooter or moulding machine can also replenish outfit where necessary afterwards, so that can adopt favourable invention and method particularly of the present invention thus.
What conform with purpose is, by device being adjusted to a gas blow-washing process so that when getting rid of gas or water vapour, microwave generator can be coupled via waveguide and antenna.But the operation of simplification device whereby because for microwave generator being connected with antenna and starting heating process, in fact only needs an adjustment movement.
Wherein, the adjustment movement to the gas blow-washing process can automatically make coupling of microwave generator and antenna.Only form so corresponding the connection, promptly closing of gas blow-washing lid etc. forms microwave generator simultaneously and is connected with the corresponding of antenna for this reason.
Especially simply be provided with on one structure and can set, the extension that makes waveguide is separable and has a clutch at burble point, and the part of antenna one side of waveguide selectively be provided with or be connected gas blow-washing covers or instrument in.In order to make gas blow-washing lid enter the use location or leave its use location again, this clutch can be connected or separate when implementing corresponding motion.
The present invention is used to strengthen and another form of implementation of quickening heating process may be.Microwave generator via the waveguide of a branch or via two waveguides with one in the gas blow-washing lid with can couple or be connected with an antenna that in molder tool, is provided with.
Above mentioned when age-hardening, can get rid of water vapour in case of necessity.If mold or core are made by the mixture of molding sand and binding agent, then this particularly conforms with purpose, and wherein binding agent is a magnesium sulfate that disperse or dissolving.Device can be regulated to the gas blow-washing process in this case, has also mentioned as mentioned, so that the water vapour that produces when getting rid of heating or heating.
In a word, reach in an advantageous manner, can keep moulding machine or core shooter and original molder tool constant, because in according to device of the present invention, also utilize existing blowing and can be used for eliminating according to dissolving water heating of the present invention and evaporation.Only antenna that is used for microwave is additional for example is installed in that the gas input covers.Certain in this case instrument is by the material manufacturing that is suitable for microwave.But when mfg. moulding die or core, also can utilize thisly to comprise that one constitutes the device of the heater of microwave generator and antenna, wherein adopt a kind ofly to be different from the binding agent of magnesium sulfate above-mentioned dispersion or dissolving and for age-hardening needs one heating process.
Another has the possibility of worth conservation value to relate to a kind of device of making mold or core; comprise at least one heater in order to age-hardening; wherein; the device of making mold is a moulding machine; and the device of making core is a core shooter; in this machinery, can use or use a kind of moulding or make the core instrument.Here as heater, one resistive heating device can be set, wherein Dao Dian core or mould form resistance and the moulding that is made from multiple components in order to take out mould or core or make the core instrument can to small part be conduction and insulate mutually at its contact position, and each parts of instrument can have at least one electric connection respectively, in order to apply the voltage that resistive heating device is used.
In such a way its can be structurally very simply at first electrical heating comprise the mould or the core of the dissolving water and/or the crystallization water, they whereby since the composition of other that wherein comprise conduct electricity.Moist core or moist mould form an electrical impedance, thereby produce electric conductivity.Therefore the voltage that applies on it can be used for drying.
Resistive heating device can have a power supply, and it comprises the frequency converter and/or the pulse shaper that is used to form pulse-shaped voltage that are used to improve frequency.Utilize pulse-shaped voltage when heating, can reach good result.
Resistive heating device can have a power supply and a transformer that is used to improve voltage, and they are connected via supply lines and moulding or the joint made on each parts of core instrument.Can raise the efficiency whereby.
Moulding or at least one parts of making the core instrument have a plurality of electric connections, and can be provided with switch between these joints and power supply, so that at the electric connection up conversion or selectively apply voltage, thereby alternately close a switch and open remaining.Therefore might always eliminate or change the polarity that appears on the electrode again.Can correspondingly realize the heating of a mould or a core equably, wherein it is also conceivable that the extremely different profile of such mould and core by the conversion of each effective electric connection.
One by the moulding that constitutes more than two parts or make in the core instrument, two parts always that each parts can have an electric connection and supply lines and such instrument can be connected on the power supply off and on.Be essential particularly for the so multipart instrument of the core of complexity.However utilize above-mentioned form of implementation to remain possible, promptly form a resistance heated and heat core up hill and dale by the voltage that applies respectively.
Obtain a kind of method and apparatus in a word, can in general core shooter, realize the machinery production of mould or core whereby and molding sand is being hardened in half a minute approximately.Wherein this method cause on the one hand magnesium sulfate in the form of its hydration extremely different fusing points and on the other hand in its crystallization water free state be useful.Magnesium sulfate promptly have about 75 ℃ fusing point as heptahydrate and in its crystallization water free state have 1124 ℃ fusing point.By removing the chemically combined crystallization water targetedly, therefore might reach the almost unexpected sclerosis of molding sand.Tangling strongly of magnesium sulfate wherein partially hydrated and hydration fully is a favourable characteristic, and it also can be fully utilized, so that be 1% just can obtain very high intensity with respect to molding sand for example to the small amount of magnesium sulfate.
The important air blowing that is used for after heating removing the original chemically combined crystallization water can realize by the nozzle of air supply and the exhaust nozzle of special setting where necessary, wherein the overvoltages of 1 of Gan Zao gas to 6 crust preferably are made of indoor air heated and conform with purpose.Heating can utilize microwave to realize in an advantageous manner because usually the quartz sand that adopts radiation is " transparent " for microwave, thereby it can penetrate bigger mould or core.In addition, only heat the magnesium sulfate that contains the crystallization water.In case the crystallization water disappears, this magnesium sulfate that does not after this have the crystallization water also is " transparent " and continuing to penetrate and no longer include obstacle for microwave.
Also can realize by resistance heated in an advantageous manner but heat, as previously discussed.
Therefore importantly, from magnesium sulfate, also eliminate, remove at least in part the chemically combined crystallization water targetedly.Occur sclerosis very rapidly in this case, this manufacturing to economy is favourable.In addition, utilize the less concentration of magnesium sulfate to reach enough intensity.Sand mold of making like this or core during at up to few 1124 ℃ be dimensionally stable and can from metal casting, separate with a spot of water.
If utilize traditional binding agent, because by means of the heating targetedly of the heating of microwave or electric induction, an age-hardening of quickening also is possible.
Description of drawings
Below by means of accompanying drawing each embodiment that the present invention makes the device of mold and pattern for casting tool or core is described in more detail.Wherein:
Fig. 1 be used to make mold or core, with the perspective view of the device of core shooting machine form, it comprises a microwave generator and corresponding antenna;
The profilograph amplification of the part of Fig. 2 sand blasting unit and that simplify greatly, its situation is to cover together with the purge that is positioned at its top and from following or opposite compressing before the sand-shooting head after sand is injected the molder tool that constitutes the core case and at this core case, wherein in this purge lid, be provided with microwave antenna in order to the heating core and get rid of dissolve remain being connected between water and microwave generator and this transmitting antenna open and lumping together or raising and can close automatically when compressing;
Fig. 3 is equivalent to the view of Fig. 2, and wherein transmitting antenna is arranged on the bottom of the core case that constitutes molder tool;
The similar view of the forms of implementation that a pair of Fig. 2 of Fig. 4 and 3 changes is wherein not only in the purge lid but also be respectively equipped with a core of penetrating in order to heating with the antenna that microwave generator can be connected or connect in the use location in the core case;
The view that is equivalent to Fig. 2 to 4 of the form of implementation that Fig. 5 one changes wherein is provided with the core that infrared radiation source is penetrated in order to heating in the core case;
The view that is equivalent to Fig. 2 to 5 of the form of implementation that Fig. 6 one changes, wherein be provided with a resistance heated as heater, the mould that wherein is used to the core that conducts electricity also be conduction and its each parts contact position be insulation and in moulding or make on each parts of core instrument and be provided with the joint that resistive heating device is used;
Fig. 7 one is equivalent to setting and the device of Fig. 6, wherein on parts of instrument for core is provided with a plurality of electric connections, it can optionally with alternately be connected via switch, so that avoid the polarization on a joint;
The device of the another change of Fig. 8, wherein make the core instrument comprise three mutually insulateds with the conduction parts, it respectively has an electric connection, wherein each two in three parts can be connected on the power supply via switch; And
Fig. 9 one is equivalent to form of implementation and the setting of Fig. 6, but the pulse shaper and the transformer transposing that wherein will be positioned at the power supply back with respect to being provided with of Fig. 6.
The specific embodiment
One integral body with 1 mark and in Fig. 1, simplify and partly cut-away shown in device be used to make core, but also can be used to make mold.Relate to a core shooter in this embodiment.
A kind of mixture of borrowing its core to be made 2 (Fig. 2 to 9) or mold in a similar manner to be made up of molding sand and binding agent is shaped, binding agent is a kind ofly soluble in waterly preferably to have the magnesium sulfate of at least one crystallization water or also can be a kind of other binding agent, wherein the mixture 3 of this sand and binding agent is input in the known manner one and advances in the sand hopper 4 and therefore inject in the whole sand-shooting head of penetrating the sand device 5 with 6 marks.Among Fig. 1 also the form with partly cut-away illustrate for penetrating the important air vessel of sand process 7.
This device 1 with the core shooter form has the core case 8 that illustrates respectively among Fig. 2 to 9, and it is combined into the use location by core upper box part spare 8a and core lower box part spare 8b, but also can be a corresponding molder tool that differently constitutes in order to make mold.A form of implementation shown in Fig. 8 in this case, wherein core upper box part spare 8a itself is a part, so that can take out the core of a corresponding complexity after the core age-hardening.
Utilize this device, might make the mould or the core of casting usefulness by the mixture 3 that molding sand and binding agent are formed, wherein, at first mix molding sand and binding agent, then, be entered into moulding or make in the core instrument by means of penetrating sand device 6, in this embodiment, promptly be input in the core case 8.This has realized and binding agent can age-hardening and give mould or core 2 necessary intensity in Fig. 2 to 9.Wherein preferably including at least one crystallization water as binding agent magnesium sulfate is scattered in and/or is dissolved in the water and mixes with molding sand to form mixture 3.Then with its input or be injected into moulding or make in the core instrument 8.
In this instrument is core case 8, make disperse water and/or the evaporation of dissolving water and at least a portion crystallization water then by heating and by means of gaseous medium from moulding or make the core instrument, promptly from core case 8, get rid of.
In order to implement this method, at least one also heater in greater detail is set on moulding or core shooter 1, therefore borrow it can heat and get rid of and dissolve the water and/or the crystallization water.
In embodiment according to Fig. 1 to 4, install on the core shooter 1 microwave generator 9 as heater and at molder tool, be in the zone of core case 8, according to embodiment in different positions, at least one microwave antenna 10 is set, and it can be connected with microwave generator 9 and be connected in the use location via a waveguide 11.Corresponding in an embodiment clutch 12 remains to be opened, though because penetrated into core 2, before core case 8 still is in and lumped together with gas blow-washing lid 13 and by means of the state before heating using microwave and the age-hardening.
Wherein in whole embodiment, can see an air admission hole 14, borrow it for example can import hot-air getting rid of the water or the water vapour of heating, this water vapour by by heater, be that the heating of microwave 9 in the use location occurs.
In Fig. 1 to 4, remain being connected between microwave generator 9 and the antenna 10 and to open.By install 1 to the adjusting of gas blow-washing process so that get rid of water vapour, otherwise that is by core case 1 to gas blow-washing lid 13 with to the relative rising campaign of the direction of sand-shooting head 5 or microwave generator 9 is connected with antenna 10 via waveguide 11, at this moment clutch 12 is engaged in described relative motion.Can heat and while or the further along water vapour that begins to get rid of appearance by microwave energy then.
In the time of the adjustment movement of gas blow-washing process, can automatically realize being connected of microwave generator 9 and antenna 10, thereby can finish whole processes rapidly.
Therefore the extension of waveguide 11 is separable and at burble point above-mentioned clutch 12 is set, and wherein the part of antenna one side of waveguide 11 selectively can be by Fig. 2 on gas blow-washing lid 13 or press Fig. 3 in molder tool or core case 8 or press Fig. 4 even setting and being connected on two positions.Fig. 4 illustrates; microwave generator 9 can couple and is connected at antennas 10 that are provided with in molder tool or core case 8 of gas blow-washing lid 13 neutralizations with one via two waveguides 11, thereby can corresponding heated mold rapidly and consumingly or core 2 and shorten the time of getting rid of the dissolving water and/or the crystallization water.
Fig. 5 illustrates a form of implementation that changes, wherein on molder tool or wherein as heater, infrared radiation source 15 is set in core case 8 in this case, if it can be used as by the substitute of heating using microwave or for example also according to Fig. 2 one antenna 10 is set in addition in the gas blow-washing lid, then can add being provided with where necessary even also to it.
Fig. 6 to 9 illustrates each embodiment of change once more, wherein as heater one resistance heated is set, and this moment, the core 2 of conduction formed resistance.Wherein the core instrument of forming by two (Fig. 6,7 and 9) or three (Fig. 8) parts once more in order to take out core 28 of making at least in part or conform with the destination and conduct electricity fully, this moment, it was made of aluminium or cast iron or steel. Parts 8a and 8b its contact position be mutually insulated and this insulating materials 16 simplify and be shown among Fig. 6 to 9.
People can see in addition, and the parts 8a of instrument or core case 8 and 8b have an electric connection 17 respectively in order to apply the voltage that resistive heating device is used.
Core upper box part spare 8a and core lower box part spare 8b, that is make each parts of core instrument 8 so belong to resistance heated, wherein core 2 forms actual resistance.
By universal mode, this resistive heating device has a power supply 19, and this power supply leads a frequency converter in order to improve the frequency and/or the pulse shaper 21 that leads in order to form the voltage of a pulse form by three phase network 20 under situation of the present invention.
This resistive heating device also has a transformer 22 in order to improve voltage, and supply lines 23 is made the parts 8a of core instrument 8 and the joint 17 on the 8b by transformer 22 guiding.If connection voltage, then the core 2 of the humidity in instrument 8 constitutes corresponding resistance or impedance, thereby flows through electric current with dry core.Voltage levvl can be selected by the thickness of core 2.In this case, reach very strong and effective dry because parts 8a constitutes with 8b and is adjacent to and the electrode that contacts core, applies voltage on it, wherein should " electrode " 8a and 8b separate by insulating materials 16, to avoid mutual short circuit.
Voltage conforms with purpose can be sine-shaped or pulse form, the voltage of rectangle particularly, and it is effective especially wherein surpassing 1000Hz, for example 3000Hz or higher high-frequency ac voltage.Wherein voltage also can be regulated and is selected greater than 1000V.The change of the pulse width by voltage can be controlled or regulate input power and make its shape and size that are adapted to a core 2, and makes in molder tool under the situation of a mould and be adapted to this mould.
Though two parts 8a and 8b constitute core case 8 and have an electric connection 17 respectively in by the embodiment of Fig. 6, but the embodiment by Fig. 7 illustrates four such electric connections 17 on core lower box part spare 8b, they are connected in parallel, wherein between these joints 17 and power supply 19, be provided with switch 24, so that at different joints 17 up conversions or selectively apply voltage, wherein alternately close a switch 24 and open remaining.Can avoid the polarization on the connector of core lower box part spare 8b whereby and reach the uniform heating as far as possible of core 2.
Fig. 8 illustrates a form of implementation, wherein makes core instrument 8 by constituting more than two parts, and wherein core upper box part spare 8a itself is divided into two parts, and these two parts are electrically isolated from one by insulation 25.Can make the core 2 of corresponding complexity whereby.
Fig. 8 illustrates, and each of these three parts has an electric connection 17 and a supply lines 23, and the latter comprises the branch line 23a and the 23b of two parallel connections here, wherein is provided with switch 26.By opening and closing switch 26 off and on, these branch line 23b in parallel can always be connected to the such two parts 8a or the 8b that are divided into many instrument 8 on the power supply 19 off and on.Therefore always have only two parts of core case 8 to be under the function of current off and on, be used as resistance and heated so that will be in wherein core.
In pressing the form of implementation of Fig. 9, be equivalent to basically by Fig. 6, being provided with in proper order of pulse shaper 21 and transformer 22 is shown also can changes like this, transformer 22 promptly in series at first is set, be pulse shaper 21 then.
In by the form of implementation of Fig. 6 to 9, be provided with an air admission hole 14 as the lid of a gas blow-washing in by the embodiment of Fig. 2 to 5 13, borrow it can import that for example hot-air is in order to get rid of the water or the water vapour of heating, this water vapour is by the heating in the use location occurs by voltage.For the gas blow-washing process, be similar to the various embodiments described above and gas blow-washing can be covered 13 stifled notes.
For the water of getting rid of evaporation can be via air admission hole 14 input gaseous mediums, for example nitrogen and/or carbon dioxide and/or air, preferably hot-air or hot gas.Therefore can realize the eliminating of the water that evaporates best by means of overvoltage.
As mentioned above, mixture 3 comprise soluble in water, not with and/or have one or where necessary the magnesium sulfate of a plurality of crystallizations water as binding agent.For example can will not be mixed together with the magnesium sulfate that has more a plurality of crystallizations water and/or mix mutually yet and be used as binding agent with a hydrocolloid with, the magnesium sulfate that has a crystallization water.Wherein particularly advantageously be, only utilize magnesium sulfate or magnesium sulfate and hydrocolloid, can disperse well and/or be dissolved in the water and mix with molding sand because comprise the magnesium sulfate of the crystallization water, but can from the workpiece that casts, separate well by means of water again later as binding agent.
Can set in one by the suitable mixture formed of binding agent molding sand and dispersion or dissolving, with the molding sand of about 100 weight deals and about 3 weight deals to the dissolving of about 20 weight deals, particularly mix mutually with the binding agent that the form of dissolving exists by magnesium sulfate.
In this case, with the sand of about 100 weight deals preferably with about 5 to 10 weight deals, mix mutually with the binding agent of form that disperse or dissolving.Must be with corresponding a spot of water by heating with utilize gas from core case 8, to get rid of and can correspondingly promptly implement this method.
In order to make the mould or the core 2 of casting usefulness, make mixture 3 and be input to a moulding or make in the core instrument 8 by molding sand and binding agent, for example inject a core shooter.The magnesium sulfate that wherein adopts a known binding agent or employing not to have and/or have at least one or more a plurality of crystallizations water is dispersed or dissolved in the water and mixes mutually as binding agent and with molding sand and import or inject molder tool or core case 8.Then for age-hardening, by heating evaporation water and a part of crystallization water and by means of gaseous medium it to be got rid of, this can very promptly finish.One such core or such mould that is made of molding sand can separate from workpiece soon and wash away after casting by means of water, because magnesium sulfate keeps its solvability.
Claims (29)
1. make the mould of casting usefulness or the method for core (2) with a kind of mixture of forming by molding sand and binding agent (3), wherein, molding sand and binding agent mixed and be entered into a moulding or make in the core instrument (8), then binding agent age-hardening and give mould or intensity that core is essential; It is characterized in that, magnesium sulfate disperseed and/or be dissolved in the water and mix mutually with molding sand and subsequently with its input or be injected into moulding or make in the core instrument (8) as binding agent, and then in moulding or make in the core instrument water heated and it is evaporated at least in part and with it from moulding or make eliminating the core instrument (8).
2. in accordance with the method for claim 1, it is characterized in that, in moulding or make in the core instrument (8), by means of microwave and/or infrared radiator, to dispersion in water and/or the mixture of solution composition (3) heat by molding sand and a kind of magnesium sulfate.
3. in accordance with the method for claim 1, it is characterized in that, in moulding or make in the core instrument (8), by in separable moulding or make on each parts of mutually insulated of partially conductive at least of core instrument (8) and apply voltage, to by molding sand and a kind of magnesium sulfate in water dispersion and/or the mixture of solution composition heat.
4. according to claim 1 or 3 described methods, it is characterized in that, will be used as the resistance of resistance heated and it is heated by molding sand and a kind of magnesium sulfate dispersion and/or the core/mould of the conduction that constitutes of the mixture of solution composition in water by voltage that applies thereon and the electric current that therefore flows through.
5. according to claim 3 or 4 described methods, it is characterized in that, voltage is applied on the electrode of contact core/mould and preferred for this reason each parts partially conductive at least, mutually insulated (8a, 8b) that adopt separable moulding or make core instrument (8).
6. according to one of claim 3 to 5 described method, it is characterized in that, apply a kind of alternating voltage as voltage.
7. according to one of claim 3 to 6 described method, it is characterized in that, as voltage apply a kind of pulse form, the voltage of rectangle particularly.
8. according to claim 6 or 7 described methods, it is characterized in that, select to surpass 1000Hz, for example 3000Hz or higher high-frequency ac voltage.
9. according to one of claim 3 to 8 described method, it is characterized in that voltage is adjustable and selects greater than 1000V or greater than 1500V especially.
10. according to one of claim 3 to 9 described method, it is characterized in that, by pulse width control or the adjusting input power that changes voltage.
11. according to one of claim 1 to 10 described method; it is characterized in that; from instrument (8), get rid of water by means of a kind of gaseous medium such as nitrogen and/or carbon dioxide and/or air by heating evaporation; wherein, this gaseous medium that is used for draining utilizes pressure or also therefore carries by the mold of formation or by core by instrument by means of sucking-off and negative pressure.
12. according to one of claim 1 to 11 described method, it is characterized in that, utilize hot gas to get rid of the water vapour that in instrument (8), produces by heating.
13. according to one of claim 1 to 12 described method, it is characterized in that, the magnesium sulfate of will be not or having at least one crystallization water with have more a plurality of crystallizations water, have nearly the magnesium sulfate of seven crystallizations water in case of necessity and mix mutually and disperse and/or be dissolved in the water and mix mutually with molding sand as binding agent, and make water and the evaporation of a part of crystallization water also then with its eliminating by heating.
14. according to one of claim 1 to 13 described method, it is characterized in that, with a kind of or have the high or higher dispersion that concentrates of magnesium sulfate of at least one crystallization water or solution and mix mutually with hydrocolloid and this mixture (3) is used as binding agent.
15. according to one of claim 1 to 14 described method, it is characterized in that, to mix mutually with the dissolving water yield that is given for a certain amount of molding sand than the needed magnesium sulfate that more has the crystallization water of saturated solution, and a part of magnesium sulfate is scattered in the solution and as dispersion mix with molding sand.
16. according to one of claim 1 to 15 described method, it is characterized in that, molding sand mixed by weight 97: 3 to about 80: 20 mutually with binding agent dispersion or dissolving.
17. according to one of claim 1 to 16 described method, it is characterized in that, the molding sand of about 100 weight deals mixed mutually with binding agent dispersion or that dissolve of about 3 weight deals to about 20 weight deals.
18. in accordance with the method for claim 17, it is characterized in that, the binding agent of about 5 to 10 weight deals is mixed with the sand facies of about 100 weight deals with form that disperse or dissolving.
19. be used to make the device (1) of mold or core (2), comprise at least one heater in order to age-hardening, wherein, the device (1) of making mold is a moulding machine, and the device of manufacturing core is a core shooter; It is characterized in that; go up at least one microwave generator of installation (9) as heater at moulding machine or core shooter (1); and be used for mold or be used in the zone of molder tool (8) of core at least one microwave antenna (10) being set, this microwave antenna can couple or be connected with microwave generator (9) via a waveguide (11).
20. according to the described device of claim 19, it is characterized in that,, microwave generator (9) can be coupled via waveguide (11) and antenna (10) being adjusted to a gas blow-washing process so that when getting rid of gas or water vapour by installing (1).
21. according to claim 19 or 20 described devices, it is characterized in that, automatically impel coupling of microwave generator (9) and microwave antenna (10) to the adjustment movement of gas blow-washing process.
22. according to one of claim 19 to 21 described device, it is characterized in that, the extension of waveguide (11) is separable and has a clutch (12) at burble point, and the part of antenna one side of waveguide (11) selectively be provided with or be connected gas blow-washing lid (13) is gone up or molder tool (8) in.
23. according to one of claim 19 to 22 described device, it is characterized in that microwave generator (9) is via the waveguide (11) of a branch or in gas blow-washing lid (13) with and can couple or be connected with the antenna (10) of a setting in molder tool (8) via two waveguides (11).
24. be used to make the device of mold or core (2), comprise at least one heater, wherein in order to age-hardening, the device of making mold is a moulding machine, and the device of making core is a core shooter, in this machinery, can use or use a kind of moulding or make core instrument (8); It is characterized in that, one resistive heating device is set as heater, wherein Dao Dian core (2) or mould form resistance, and the moulding of forming by a plurality of parts (8a, 8b) in order to take out mould or core (2) or make core instrument (8) to small part be conduction and insulate at its contact position, and each parts of instrument (8) (8a, 8b) have at least one electric connection (17) respectively, in order to apply the voltage that resistive heating device is used.
25., it is characterized in that resistive heating device has a power supply (19) according to the described device of claim 24, this power supply comprises that one is used to improve the frequency converter of frequency and/or the pulse shaper (21) that is used to form a kind of pulse-shaped voltage.
26. according to one of claim 24 or 25 described device, it is characterized in that, resistive heating device has a power supply and a transformer (22) that is used to improve voltage, and they are connected via supply lines and moulding or the joint (17) made on each parts (8a, 8b) of core instrument (8).
27. according to one of claim 24 to 26 described device, it is characterized in that, moulding or at least one parts (8b) of making core instrument (8) have a plurality of electric connections (17), and between these joints (17) and power supply (19), be provided with switch (24), so that at the electric connection up conversion or selectively apply voltage, thereby alternately close a switch (24) and open remaining.
28. according to one of claim 24 to 27 described device, it is characterized in that, one by the moulding that constitutes more than two parts (8a, 8b) or make in the core instrument (8), two parts always that each parts has an electric connection (17) and supply lines and a kind of such instrument are connected on the power supply (19) off and on.
29. according to one of claim 19 to 28 described device; wherein; mold or core can be with a kind of mixture manufacturings of being made up of molding sand and binding agent; binding agent is a magnesium sulfate a kind of dispersion or dissolving; it is characterized in that; device (1) can be adjusted to the gas blow-washing process, so that get rid of the water vapour that occurs when being heated and heat.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10138287.1 | 2001-08-10 | ||
| DE10138287 | 2001-08-10 | ||
| DE10200927A DE10200927A1 (en) | 2001-08-10 | 2002-01-12 | Method and device for producing molds or cores for foundry purposes |
| DE10200927.9 | 2002-01-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1538887A true CN1538887A (en) | 2004-10-20 |
Family
ID=26009871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA02815469XA Pending CN1538887A (en) | 2001-08-10 | 2002-07-16 | Method and device for production of molds or cores for foundry purposes |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US20040192806A1 (en) |
| EP (1) | EP1417061A1 (en) |
| JP (1) | JP2005508252A (en) |
| CN (1) | CN1538887A (en) |
| CA (1) | CA2457588A1 (en) |
| EA (1) | EA005362B1 (en) |
| MX (1) | MXPA04001086A (en) |
| WO (1) | WO2003013761A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103302231A (en) * | 2013-06-20 | 2013-09-18 | 重庆长江造型材料（集团）股份有限公司 | Solidification method for wet core of water-based adhesive |
| CN105102151A (en) * | 2013-09-11 | 2015-11-25 | 卢伯股份有限公司 | Device and method for hardening foundry cores |
| CN105562613A (en) * | 2014-10-10 | 2016-05-11 | 咸阳勃力模具制造有限公司 | Aero-engine porous laminate transpiration cooling turbine blade ceramic mold core one-step molding method |
| CN109311079A (en) * | 2016-03-07 | 2019-02-05 | 苏州明志科技有限公司 | A kind of core making machine being integrated with microwave curing function |
| CN110248747A (en) * | 2016-12-06 | 2019-09-17 | 索普莱恩有限责任公司 | For manufacturing the method and molding or coremaking tool of mold and type core |
| CN112384315A (en) * | 2018-07-09 | 2021-02-19 | 花王株式会社 | Inorganic precoated sand |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10251418B3 (en) * | 2002-11-02 | 2004-02-26 | Laempe + Gies Gmbh | Production of molds or cores made from a mixture of sand and binder dissolved in water and/or containing water of crystallization, e.g. magnesium sulfate comprises feeding heat into the sand before its inclusion into a molding or core tool |
| JP2004283859A (en) * | 2003-03-20 | 2004-10-14 | Toyota Motor Corp | Water-soluble core and its manufacturing method |
| KR101141849B1 (en) | 2010-04-23 | 2012-05-07 | (주)대보스틸 | A Stiffenner of a Mold |
| ES2973086T3 (en) | 2017-10-17 | 2024-06-18 | Magma Giessereitechnologie Gmbh | Core firing apparatus and method of controlling the core firing apparatus |
| DE202018106268U1 (en) | 2018-11-04 | 2018-11-28 | Wolfram Bach | Tool for producing molds or cores by electrical resistance heating of a plastic-based material |
| DE102020209100B4 (en) | 2020-07-21 | 2024-05-23 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eingetragener Verein | Process for producing sand cores suitable for foundry purposes |
| CN112157248B (en) * | 2020-09-25 | 2021-12-10 | 河北欧耐机械模具股份有限公司 | A coated sand casting mold |
| RU2763701C1 (en) * | 2021-06-22 | 2021-12-30 | федеральное государственное бюджетное образовательное учреждение высшего образования "Нижегородский государственный технический университет им. Р.Е. Алексеева" (НГТУ) | Method for making cores and molds |
| CN113458345A (en) * | 2021-07-15 | 2021-10-01 | 内蒙古金域凤形矿业耐磨材料有限公司 | Sand box for lost foam casting process |
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| SU839648A1 (en) * | 1979-02-14 | 1981-06-23 | Предприятие П/Я В-8231 | Mixture for producing water soluble cores at aluminium alloy casting production |
| JPS60124441A (en) * | 1983-12-12 | 1985-07-03 | Hitachi Ltd | Drying method of casting mold |
| KR890004247B1 (en) * | 1984-04-02 | 1989-10-28 | 가부시기가이샤 히다찌세이사꾸쇼 | Slip casting molding method and molding mold |
| DE4037091C2 (en) * | 1990-11-22 | 1996-06-20 | Leybold Ag | Device for generating a homogeneous microwave field |
| JPH05104200A (en) * | 1991-10-16 | 1993-04-27 | Hitachi Metals Ltd | Manufacture of mold |
| US6371194B1 (en) * | 1996-08-09 | 2002-04-16 | Vaw Aluminium Ag | Method for producing core preforms and recycling core sand for a foundry |
| DE19632293C2 (en) * | 1996-08-09 | 1999-06-10 | Thomas Prof Dr In Steinhaeuser | Process for the production of core moldings for foundry technology |
-
2002
- 2002-07-16 EP EP02754890A patent/EP1417061A1/en not_active Withdrawn
- 2002-07-16 EA EA200400295A patent/EA005362B1/en not_active IP Right Cessation
- 2002-07-16 CN CNA02815469XA patent/CN1538887A/en active Pending
- 2002-07-16 CA CA002457588A patent/CA2457588A1/en not_active Abandoned
- 2002-07-16 US US10/486,475 patent/US20040192806A1/en not_active Abandoned
- 2002-07-16 JP JP2003518753A patent/JP2005508252A/en active Pending
- 2002-07-16 WO PCT/EP2002/007885 patent/WO2003013761A1/en not_active Application Discontinuation
- 2002-07-16 MX MXPA04001086A patent/MXPA04001086A/en not_active Application Discontinuation
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103302231A (en) * | 2013-06-20 | 2013-09-18 | 重庆长江造型材料（集团）股份有限公司 | Solidification method for wet core of water-based adhesive |
| CN105102151A (en) * | 2013-09-11 | 2015-11-25 | 卢伯股份有限公司 | Device and method for hardening foundry cores |
| CN105562613A (en) * | 2014-10-10 | 2016-05-11 | 咸阳勃力模具制造有限公司 | Aero-engine porous laminate transpiration cooling turbine blade ceramic mold core one-step molding method |
| CN109311079A (en) * | 2016-03-07 | 2019-02-05 | 苏州明志科技有限公司 | A kind of core making machine being integrated with microwave curing function |
| CN110248747A (en) * | 2016-12-06 | 2019-09-17 | 索普莱恩有限责任公司 | For manufacturing the method and molding or coremaking tool of mold and type core |
| US10967420B2 (en) | 2016-12-06 | 2021-04-06 | Soplain GmbH | Method and mold tool or core tool for producing molds or cores |
| CN112384315A (en) * | 2018-07-09 | 2021-02-19 | 花王株式会社 | Inorganic precoated sand |
| US11958103B2 (en) | 2018-07-09 | 2024-04-16 | Kao Corporation | Inorganic coated sand |
Also Published As
| Publication number | Publication date |
|---|---|
| EA200400295A1 (en) | 2004-06-24 |
| EA005362B1 (en) | 2005-02-24 |
| EP1417061A1 (en) | 2004-05-12 |
| JP2005508252A (en) | 2005-03-31 |
| US20040192806A1 (en) | 2004-09-30 |
| CA2457588A1 (en) | 2003-02-20 |
| WO2003013761A1 (en) | 2003-02-20 |
| MXPA04001086A (en) | 2004-07-08 |
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