EP2916976A1 - Procédé permettant de produire des noyaux perdus ou des parties de moule pour la production de pièces moulées - Google Patents

Procédé permettant de produire des noyaux perdus ou des parties de moule pour la production de pièces moulées

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Publication number
EP2916976A1
EP2916976A1 EP14786500.0A EP14786500A EP2916976A1 EP 2916976 A1 EP2916976 A1 EP 2916976A1 EP 14786500 A EP14786500 A EP 14786500A EP 2916976 A1 EP2916976 A1 EP 2916976A1
Authority
EP
European Patent Office
Prior art keywords
binder
silicate
core
hot air
magnesium
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
EP14786500.0A
Other languages
German (de)
English (en)
Other versions
EP2916976B1 (fr
Inventor
Hartmut POLZIN
Theo KOOYERS
Matthias STREHLE
Frank GLEISSNER
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.)
Peak Deutschland GmbH
Original Assignee
Peak Deutschland GmbH
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Filing date
Publication date
Application filed by Peak Deutschland GmbH filed Critical Peak Deutschland GmbH
Priority to PL14786500T priority Critical patent/PL2916976T3/pl
Publication of EP2916976A1 publication Critical patent/EP2916976A1/fr
Application granted granted Critical
Publication of EP2916976B1 publication Critical patent/EP2916976B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
    • B22C1/186—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents contaming ammonium or metal silicates, silica sols
    • B22C1/188—Alkali metal silicates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/162—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents use of a gaseous treating agent for hardening the binder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
    • B22C1/181—Cements, oxides or clays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
    • B22C1/183—Sols, colloids or hydroxide gels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/23—Compacting by gas pressure or vacuum
    • B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores

Definitions

  • the invention relates to the production of lost cores or moldings for casting molds for the production of cast components (casting production).
  • Lost cores are needed in the foundry industry for the realization of voids inside castings and can have an extremely complex structure, e.g. B. cores for car cylinder heads.
  • the lost cores are made from a granular and dry base material, a sand, often quartz sand, but also chromite, zirconium, olivine, feldspar, mullite or other sands and a chemically hardening binder system. These components are mixed, optionally introduced with the addition of further additives and by pressurization (compressed air) in the mold (core or molding box).
  • the subsequent solidification of the still loose molding material mixture can be carried out by various means, for example by passing a hardening gas, e.g. Carbon dioxide or thermal solidification by a heated, d. H. metallic, archetype tool.
  • Water-glass-based binders are known, which mostly consist of multicomponent systems of the waterglass component and of a usually powdery additive component. Blended with mold bases and formed into cores or core moldings, such moldings can be solidified by physical consolidation (dehydration, dehydration, drying) or chemical hardening (chemical hardening).
  • the INOTEC process which uses a binder mixture based on sodium silicate as a binder, wherein in this binder by adding additives to the so-called Inotec promoters different molding properties are improved.
  • the curing takes place via a stepwise proceeding dehydration of the core molding material by mold temperatures between 150 to 250 ° C and a subsequent hot air flushing in the same temperature range.
  • binder contents between 1, 8 and 2.5% and promoter contents between 0.1% and 1% are used.
  • the promoter improves the flowability and strength of the core-form fabric and the core by bonding individual binder particles together and building a three-dimensional mesh.
  • the main areas of application of the INOTEC process and the INOTEC binders are light metal and non-ferrous metal alloys, for example for the production of cylinder heads as well as fittings castings.
  • a CORDIS binder system in which the binder has a matrix of a combination of phosphate, borate and silicate groups.
  • the CORDIS binder system is a two-component inorganic system composed of the binder CORDIS and the additive Anorgit.
  • a heated core box 130 to 180 ° C
  • a H hinderizibegasung (100 to 200 ° C) is necessary.
  • Binder contents used can be between 1, 5 and 3.0%, depending on the binder type. In this case, bending strengths of 350 to 550 N / cm 2 are achieved.
  • the CORDIS binder system is also used to make inorganic bonded cores in tempered core-making tools.
  • the Cordis binder system is composed of water as a solvent and an inorganic binder matrix. Depending on the application, this binder matrix consists of a combination of modified phosphate, silicate and borate groups.
  • this binder matrix consists of a combination of modified phosphate, silicate and borate groups.
  • inorganic substances directly in the binders or as an additive in the core production properties can be specifically controlled. These include, for example, the flowability, the reactivity of the molding material mixture, the wetting of the core by the melt or the storage stability.
  • the problem with this binder is that due to its hydrophilicity, the shelf life of bound cores is limited. For example, when stored for 24 hours, the strengths drop by about 1/3 of the initial strength.
  • the Cordis binder systems for aluminum gravity chill casting are preferred.
  • AWB inorganic warm box
  • the AWB process also uses heated core boxes (160 to 200 ° C).
  • a negative pressure is applied to the core box, which serves to deduct the resulting water vapor.
  • Curing is purely physical, which positively influences the regeneration of the molding material after casting. After the core in the core box has a certain machining strength, it is completely cured in a microwave at low power.
  • the AWB process is based on the thermal hardening of water-glass-bonded molded materials in a tempered tool with subsequent microwave drying.
  • the binder used is a modified water glass, which receives a low viscosity by dilution with sodium hydroxide solution.
  • the flowability of the molding mixtures prepared therewith and thus their ductility allows a good production of the core or molding.
  • the solidification of the molding material in the AWB process takes place exclusively via dehydration, ie drying at tool temperatures between 160 and 200 ° C, whereby an additional vacuum can be applied.
  • the final drying is then ensured by low power microwave ovens.
  • the binder additions are between 1, 5 and 2.5%. Additives are dispensed with.
  • a molding material for moldings of casting molds for casting of light metal melts is known, being used as the molding material is a quartz-free sand (olivine) and an inorganic binder based on water glass.
  • Two-component binder systems are known from the prior art.
  • DE 20 2008 017 975 U1 discloses a two-component system comprising a first liquid, water glass and a second solid, particulate metal oxide-containing component.
  • a surfactant preferably added to the liquid component.
  • the metal oxide has a particle size of less than 100 ⁇ and greater than 10 ⁇ .
  • the disadvantage of adding a surface-active substance to this binder is necessary.
  • the binder is provided as a two-component system and must first be laboriously mixed together before use.
  • DE 2434431 A1 discloses a binder system based on water glass, wherein the molding mixtures prepared therewith contain, in addition to the molding base material and the binder, a number of additional components.
  • the binder has a ratio of silica to alkali oxide of between 3.5: 1 and 10: 1 and is added to the molding base in proportions of between 3 and 15% by weight.
  • the additives used in this multicomponent system are clay or alumina, carbonaceous materials (e.g., pitch or soot), and film-forming resinous adhesives (e.g., polyvinyl acetate dispersions or vinyl acetate-ethylene copolymers).
  • DE 10 2012 020 510 A1 discloses a molding material mixture consisting of a refractory molding base material, an inorganic binder based on water glass and particulate amorphous SiO 2. Furthermore, this system using a two-component binder contains additional organic additives as well as various surfactants. The particulate amorphous S1O2 is added here as a powder.
  • the molding material mixture used contains a hardener (eg an ester or phosphate compound) and is suitable for use in cast aluminum suitable. The curing of the molding material mixture is carried out with the aid of hot tools, which are preferably heated to 120 to 250 ° C.
  • DE 10 2007 027 577 A1 discloses a molding material mixture which, in addition to the alkali silicate-based binder, contains from 0.1 to 10% sodium hydroxide solution and an addition of between 0.1 and 3% by weight of a suspension having a solids content of between 30 and 70% of amorphous, contains spherical S1O2.
  • this method uses microwave energy.
  • CN 1721103 A discloses an inorganic binder for molding production with an improved decomposition behavior after casting of the castings.
  • the binder contains dextrose powder, calcium carbonate powder, a suspending agent and other additives.
  • DE 10 2007 023 883 A1 discloses a shot gas supply device for supplying a core shooter with a humidified gas with a certain humidity, whereby the temperature of this gas can also be varied.
  • a microwave radiator can be used for tempering the humidified gas.
  • EP 2 163 328 A1 discloses a process in which the molding base material is coated with a water glass binder in the range between 0.25 and 0.9% based on the total molding material weight, in addition the binder contains at least one additive from the groups of adhesion promoters, flow improvers, improvers for the surface, desiccant or release agent. Furthermore, at least one curing agent is contained in the molding material mixture, which cures, for example, by contact with water vapor. The curing of the molded parts is carried out in a heated mold, which is preferably heated to temperatures between 60 and 120 ° C.
  • EP 1 095 719 A2 describes a binder system for molding sands for the production of cores.
  • the waterglass-based binder system consists of an aqueous alkali silicate solution and a hygroscopic base, such as sodium hydroxide, added in a ratio of 1: 4 to 1: 6.
  • the water glass has a modulus S1O2 / M2O of 2.5 to 3.5 and a solids content of 20 to 40%.
  • the binder system also contains a surface-active substance, such as silicone oil, which has a boiling point> 250 ° C.
  • the binder system is mixed with a suitable refractory material, such as quartz sand, and can then be shot into a core box with a core shooter.
  • a suitable refractory material such as quartz sand
  • the curing the molding material mixture takes place by the withdrawal of the water still contained.
  • the drying or hardening of the casting mold can also take place under the action of microwaves.
  • WO 2006/024540 A2 describes that the strength of casting molds both immediately after molding and curing as well as by the use of a binder, which contains an alkali water glass and a particulate metal oxide, which is selected from the group of silica, alumina, titania and zirconia can be significantly improved when stored under high humidity.
  • the particle size of these metal oxides is preferably less than 300 ⁇ , particularly preferably less than 100 ⁇ .
  • the procedure is generally such that initially the refractory molding base material is introduced and then the binder is added with stirring.
  • the water glass and the particulate metal oxide can be added per se in any order.
  • the present invention is based on the object to develop a process for the production of lost cores or moldings for casting molds that with an environmentally and workplace friendly binder system using original molds made of wood, plastic, metal or combinations thereof without active heating the production complicated shaped lost cores or moldings using inorganic binder systems.
  • the object is achieved by a process for the production of lost cores or moldings for casting molds for casting production, in which a molding base material mixed with an alkali silicate or waterglass binder and with a core shooting machine in a core box a lost core or a molding for casting molds is formed and which is characterized in that the alkali metal silicate or water glass binder, an alkali silicate or water glass solution with a modulus of 1, 5 to 3.5 and natural and / or synthetic additives in a proportion of 0.1 to 25 Ma.
  • the lost core or molding contains, whereby the natural At least 1 to 5% by mass, based on the total amount of binder, aluminum silicate, magnesium silicate and sodium aluminum silicate, of the lost core or molding is formed in an unheated core box and the lost core thus formed is at least 1 to 5% by weight or the molding is cured with hot air.
  • a modified alkali metal silicate or water glass solution is used in conventional sands as the molding material as a binder
  • the binder according to the invention contains additives based on natural or synthetic minerals with a particle size of less than 5 ⁇ and wherein the core shooter produced lost core with hot air, the can be enriched with CO2, is cured.
  • Lost cores designate molded parts that are used in the production of castings, for example, to act as a placeholder for complex contours, mostly cavities, in casting. On the one hand, these must be strong and strong enough to retain their shape during the casting process, on the other hand they should be easily removable from the finished casting after the casting process and cooling of the casting. For this reason, the lost cores consist of a molding material and a binder, which provides sufficient stability to withstand the above claims.
  • Moldings according to the invention designate parts of a casting mold, which correspond, for example, in their outer shape to the later casting.
  • Water glass solution is not a uniform chemical compound but a collective name for glassy solidified melts of alkali silicates of varying composition in solution.
  • Aqueous alkali silicate solutions are known in the art as water glass solutions.
  • Water glass solutions have the general composition XS1O2 * yM2 ⁇ D * ZH2O, where M is an alkali metal, preferably selected from sodium, potassium and lithium.
  • M is an alkali metal, preferably selected from sodium, potassium and lithium.
  • the ratio of silica to alkali oxide is referred to as a module.
  • the module denotes the molar ratio of the two components.
  • the binder according to the invention ensures that the molding material mixture is held together in the desired shape and a lost core or a molded part is formed after the curing of the binder.
  • the lost core or the molded part is intended to be dimensionally stable at least until the casting to be produced has solidified and cooled sufficiently that it no longer suffers any deformation.
  • the binder can be used as single or multi-component Component system, ie it can be mixed together just before use or present as a finished formulation.
  • the fine-grained natural and / or synthetic additives are present in the binder in proportions of from 0.1 to 25% by mass, preferably in proportions of from 0.5 to 15% by mass.
  • the proportion of the binder to that of the molding material mixture in the core production is less than 5% by mass and is preferably from 0.5 to 3.5% by mass, particularly preferably from 1.0% to 2.0% by mass.
  • the natural and / or synthetic additives have a particle size of less than 5 ⁇ , which advantageously prevents settling of the additives in the binder.
  • the binder is shelf stable for several months, but at least 2 months.
  • a core shooter is a device for producing lost cores.
  • the person skilled in common core shooting machines are known.
  • the core shooter is used for shooting the mixed with binder molding base in a core box.
  • the core boxes are the forms that give the lost core its later form.
  • the core box according to the invention itself is not heated, which is why the material of the core box can be selected from plastic, wood and metal or metal alloys, such as aluminum.
  • the core box has room temperature at least at the first use.
  • energy is saved, since it is not necessary to first heat a complete core box and to keep it constantly warm over the time of use.
  • the core box consists of a heatable material, preferably of steel.
  • the core box heats up when the lost mold is cured by means of hot air, thus contributing to faster hardening of the following lost cores into this core box.
  • air designates the naturally occurring gas mixture of the earth's atmosphere, the composition of which varies slightly and is known to the person skilled in the art, but contains at least nitrogen, oxygen, argon and smaller proportions, for example, of other noble gases and carbon dioxide in the main components.
  • the aluminum silicate is preferably natural aluminum silicate
  • the magnesium silicate is a natural magnesium silicate
  • the sodium aluminum silicate is a synthetic sodium silicate.
  • aluminum silicate The skilled person is aware of the various sources and types of natural and synthetic additives.
  • the binder is preferably mixed in proportions of less than 5% by weight, based on the amount of the molding base material, with the molding base material.
  • At least one sand selected from quartz, zirconium, chromite, olivine feldspar, mullite, chamotte, bauxite or rutile sand is preferably used as the molding base material.
  • sand denotes all mineral substances having a particle diameter in a size range from 0.02 to 2 mm.
  • the binder preferably contains at least one further natural and / or synthetic additive selected from zirconium silicate, aluminum oxide, aluminum hydroxide, magnesium oxide, magnesium hydroxide, titanium oxide, titanium hydroxide, sodium aluminate, potassium aluminate, lithium aluminate, sodium germanate, potassium germanate, lithium germanate, aluminum silicate, magnesium silicate, aluminum magnesium silicate, magnesium iron silicate, iron oxide , Iron hydroxide and silicon dioxide in a proportion of 0 to 3 wt .-%, measured on the total content of the binder.
  • the natural or synthetic materials added to the binder system may include alumina, aluminum hydroxide, magnesium oxide, magnesium hydroxide, titanium oxide, titanium hydroxide, sodium aluminate, potassium aluminate or lithium aluminate, sodium germanate, potassium germanate, lithium germanate, aluminum silicate, magnesium silicate, aluminum magnesium silicate, magnesium iron silicate, iron oxide, iron hydroxide or silica.
  • the following materials are particularly suitable: magnesium hydroxide, lithium aluminate, aluminum silicate, magnesium silicate, aluminum magnesium silicate and / or silicon dioxide.
  • a mono-component binder is preferably used as the alkali silicate or water glass binder.
  • One-component binder designates a one-component system in the sense of the invention.
  • One-component systems are characterized by the fact that all components which are required for later setting or hardening of the binder (one-component system) are already contained in the one-component binder. Mixing before its use is thus advantageously no longer necessary.
  • a hot air generator is used for curing with hot air, which is integrated mechanically or pressure-tight in or on the core shooting machine.
  • Hot air generators are devices that can heat air and other gases or gas mixtures to a desired temperature by sucking and passing them through the heated device.
  • the person skilled in various hot air heaters are known.
  • heat losses are minimized by integrating the hot air generator in or on the core shooter or in its immediate vicinity.
  • the molding material mixture, mixed with the binder can be cured by contacting with hot air to form a lost core or molding.
  • the hot air generator is connected by a permanent mechanical connection with the core shooting machine.
  • connection of hot air generator and core shooter can be done for example via a fixed line or a flexible hose.
  • the person skilled in methods for connecting the two devices are known.
  • control of the hot air generator is integrated into the control of the core shooting machine.
  • the hot air at a temperature up to 500 ° C, more preferably from 150 to 300 ° C, most preferably from 150 to 200 ° C used.
  • the degree of hardening can be increased.
  • pure carbon dioxide is used to cure the binder.
  • Hot air is preferably used with a volume flow of up to 40,000 l / min, more preferably with a volume flow of 20,000 l / min up to 35,000 l / min for curing the binder.
  • the hot air is preferably used at a pressure of up to 10 bar, preferably at a pressure of 2 to 5 bar, very particularly preferably at a pressure of 2 to 4 bar.
  • the lost core can be cured in a short time at relatively low energy consumption.
  • the known in the prior art heating the entire core boxes requires a much higher energy consumption.
  • a directed suction of the hot air by a negative pressure of up to 1 bar Preferably, a directed suction of the hot air by a negative pressure of up to 1 bar.
  • the solid lost core or molding is removed from the core box and used for casting production.
  • a hot air generator is integrated mechanically or pressure-tight in or on a core shooter or in the immediate vicinity in order to minimize heat losses.
  • the integration of the hot air generator is preferably carried out by a permanent mechanical connection with the core shooter.
  • the control of the hot air generator is integrated into the control of the core shooting machine.
  • hot air with a temperature of up to 500 ° C and an overpressure of up to 10 bar is used.
  • the hot air can also be sucked in by a negative pressure of up to 1 bar.
  • the control and regulation of the volume flow takes place in the range up to 40,000 l / min.
  • the inventive method allows the production of lost cores or moldings for molds with a umweit- and workplace friendly binder system.
  • the binder system is a one-component system, which allows a simplified application.
  • the binder can be used in small amounts, preferably 2 Ma-% binder, measured on the mass of the molding material.
  • core boxes can also be used made of heat-sensitive materials.
  • the lost cores or moldings produced by the process according to the invention in addition to a high primary strength, also have a low secondary strength after de-casting.
  • primary strength refers to the strength of the lost cores or molded parts after production.
  • the primary strength is high so that the lost cores or moldings are long lasting and shelf stable and do not disintegrate during use.
  • Secondary strength refers to the strength according to the invention after the production of a casting by means of a lost core or molded part.
  • the secondary strength is low, so that the lost core or molding can be quickly and easily released from the mold.
  • the invention also includes an alkali or water glass binder for binding a mold base for lost cores or moldings for casting molds for casting production containing an alkali silicate or water glass solution with a modulus of 1, 5 to 3.5 and natural and / or synthetic additives with a Proportion of 0.1 to 25 wt .-%, measured on the total content of the binder, with a particle size of less than 5 ⁇ , wherein the natural and / or synthetic additives at least, in each case to 1 to 5% by mass, measured on the total content of the binder , Aluminum silicate, magnesium silicate and sodium aluminosilicate.
  • the binders of the invention have a higher flowability and a lower water absorption compared to known binders.
  • Advantageously lost cores or moldings can be made with a higher strength than with conventional binders.
  • the binder preferably contains at least one further natural and / or synthetic additive selected from zirconium silicate, aluminum oxide, aluminum hydroxide, magnesium oxide, magnesium hydroxide, titanium oxide, titanium hydroxide, sodium aluminate, potassium aluminate, lithium aluminate, sodium germanate, potassium germanate, lithium germanate, aluminum silicate, magnesium silicate, aluminum magnesium silicate, magnesium iron silicate, iron oxide , Iron hydroxide and silicon dioxide in a proportion of 0 to 3 wt .-%, measured on the total content of the binder.
  • the alkali silicate or waterglass binder is a one-component binder.
  • all ingredients of the binder are in a formulation and need not be mixed together prior to application of the binder, which facilitates application of the binder.
  • the invention also includes the use of the alkali silicate or water glass binder for producing lost cores or moldings for casting molds for casting production.
  • quartz sand mixed as a molding material on the one hand with a known binder "binder old 1" and on the other with a known binder "binder old 2".
  • molding material mixtures are prepared with a molding material content of 98% by mass and 98.5% by mass.
  • the binder content of the molding material mixture was 2% by mass and 1.5% by mass.
  • the percentage by weight refers to the total content of the mixture of molding material and binder.
  • a batch mixer was used for mixing.
  • Binder alt 1 is a known alkali silicate binder with a modulus of 2.3 containing only organic additives in small proportions (1.5% oxoanion, 0.5% polyol and 2% sodium hydroxide)
  • Binder alt 2 is a known alkali metal silicate binder with a modulus of 2.3 containing small amounts of organic additives (1.5% oxoanion, 0.5% polyol and 2% sodium hydroxide) and 0.5% flow improver.
  • the finished molding material mixture is then transferred to the reservoir of a core shooter (DISA Core EP 20). Subsequently, the filling of the unheated core box with the molding material mixture by short-term (2 s) compressed air (2.5 bar).
  • the core box is separated from the shooting head of the machine and a hot air generator (type DISA, power 8 KW) is connected. Then the formed lost core is flowed through with hot air according to the values for temperature, pressure and time given in the tables.
  • a hot air generator type DISA, power 8 KW
  • Example 2 Production of Lost Cores With Inventive Alkali Silicate or Water Glass Monocomponent Binders
  • quartz sand is used as a molding material.
  • the quartz sand is mixed with a proportion of 98% by mass with 2.0% by weight binder and in a second experiment with 98.5% quartz sand and 1.5% binder with a batch mixer.
  • Waterglass solutions (modulus 2.0 to 3.5) with the following additives are used as one-component binders:
  • the compressive strength was determined on the basis of cylindrical test specimens (preferably 50 mm diameter and 50 mm height). For this purpose, the test specimen is inserted and loaded with its end face between two fixed and one movable thrust washer. The indicated on breaking the test specimen and referred to its cross-section force is given as compressive strength in N / cm 2 .
  • the compressive strength is determined in accordance with the VDG (Association of German Foundry Experts) sheet "Testing of Tone Forming Materials - Determination of Strengths", Issue 2, P38, April 1988.
  • the residual compressive strength is determined analogously to the compressive strength.
  • the flexural strength is determined in accordance with DIN 52404 and the specification for the determination of flexural strength by the VDG (Association of German Foundry Experts) sheet "Binder Testing - Testing of Cold-curing Resin-Bonded Wet Forming Materials with Aerosol and / or Gas Curing", P73, August 1972.
  • VDG Association of German Foundry Experts
  • Tables 1 and 2 document the values for flexural strength and compressive strength for Examples 1 and 2. Flexural strength and compressive strength were determined with the Multiserv LRu-2e universal strength tester.
  • Table 3 documents the residual compressive strength values for Examples 1 and 2 after simulated casting at 400 ° C and at 800 ° C.
  • Tables 4 to 9 document the experimental results achieved using binder new with a binder content of 1.5% by weight and 2.0% by weight at different fumigation temperatures and times.
  • Tables 4 - 9 firing pressure 2.5 bar, firing time 2.0 s, bending resistance test at the bending joint, times in the table indicate the test time after test specimen removal from the core box; for residual compressive strength 20 minutes annealing of the samples at test temperature, testing 1 hour after end annealing, all measured values mean values from 3 individual measurements.
  • the one-component binder according to the invention can be used to lower proportions of the molding material mixture than is usual in the previous binding systems according to the prior art.
  • the lower proportions of one-component binder of from 1.5 to 2% by mass, based on the amount of molding material used, lost cores having at least the same good strength properties are obtained.
  • lost cores or moldings with known binders (“Binder alt 1" and "Binder alt 2") with equally low levels of binders were produced.
  • Table 1 shows the flexural strengths of the lost cores. It becomes clear that the lost cores produced with the one-component binder according to the invention have substantially higher flexural strengths both immediately and after 1 h and after 24 h than lost cores produced with the conventional binders. This trend can also be seen in the compressive strengths.
  • test values in Tables 4 to 9 document that with binder proportions of 1, 5 and 2.0% by mass at gassing temperatures of 150-170 ° C and gassing times of 1 to 3 minutes both very high values for bending strength and very low values be achieved for the residual compressive strength. This behavior proven on test specimens comes very close to the practical requirement of very high primary and very low secondary strengths (ideally 0).

Abstract

L'invention concerne un procédé permettant de produire des noyaux perdus ou des parties de moule pour la production de pièces moulées. Selon ce procédé, une matière de base à mouler est mélangée à un liant silicate alcalin ou verre soluble et un noyau perdu ou une partie de moule destiné(e) à la production d'une pièce moulée est formé(e) au moyen d'une machine à tirer les noyaux dans une boîte à noyau. Le liant silicate alcalin ou verre soluble contient une solution de silicate alcalin ou de verre soluble présentant un module de 1,5 à 3,5 et des additifs naturels et/ou synthétiques présentant une proportion de 0,1 à 25 % en masse, mesuré sur la proportion totale du liant, avec une taille de grain inférieure à 5 μm, les additifs naturels et/ou synthétiques sont au moins, respectivement jusqu'à 1 à 5 % en masse, mesuré sur la proportion totale du liant, du silicate d'aluminium, du silicate de magnésium et du silicate de sodium et d'aluminium, le noyau perdu ou l'autre partie de moule est formé(e) dans une boîte à noyau non chauffée et le noyau perdu ainsi formé ou la partie de moule est durci(e) à l'air chaud.
EP14786500.0A 2013-10-19 2014-10-17 Procédé permettant de produire des noyaux perdus ou des parties de moule pour la production de pièces moulées Active EP2916976B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL14786500T PL2916976T3 (pl) 2013-10-19 2014-10-17 Sposób wytwarzania traconych rdzeni lub elementów formowanych do produkcji odlewów

Applications Claiming Priority (2)

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DE102013017390 2013-10-19
PCT/EP2014/072361 WO2015055838A1 (fr) 2013-10-19 2014-10-17 Procédé permettant de produire des noyaux perdus ou des parties de moule pour la production de pièces moulées

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EP2916976A1 true EP2916976A1 (fr) 2015-09-16
EP2916976B1 EP2916976B1 (fr) 2017-03-08

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US (1) US10092947B2 (fr)
EP (1) EP2916976B1 (fr)
JP (1) JP6141539B2 (fr)
CN (1) CN105658352B (fr)
DE (1) DE102014221237A1 (fr)
ES (1) ES2628255T3 (fr)
PL (1) PL2916976T3 (fr)
WO (1) WO2015055838A1 (fr)

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JP6619309B2 (ja) * 2016-09-07 2019-12-11 株式会社神戸製鋼所 鋳型造型方法
EP3338911B1 (fr) * 2016-12-20 2020-04-22 Loramendi, S.COOP. Machine et procédé de fabrication de noyau en sable
DE102017107531A1 (de) * 2017-04-07 2018-10-11 HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung Verfahren zur Herstellung von Gießformen, Kernen und daraus regenerierten Formgrundstoffen
EP3473351B8 (fr) 2017-10-17 2024-03-06 MAGMA Gießereitechnologie GmbH Appareil à tirer les noyaux et procédé pour commander un appareil à tirer les noyaux
CN110756745B (zh) * 2018-07-28 2021-03-02 江阴市惠尔信精密装备股份有限公司 一种铸件砂模成型工艺
CN109047670B (zh) * 2018-08-24 2020-07-17 南京泉峰汽车精密技术股份有限公司 盐芯制备方法
DE102018215957A1 (de) * 2018-09-19 2020-03-19 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Gießkern für Gießformen sowie Verfahren zu dessen Herstellung
CN109465379B (zh) * 2018-11-20 2020-11-06 沈阳工业大学 一种co2硬化水玻璃砂用添加剂及使用方法
CN109692938B (zh) * 2018-11-20 2020-12-15 沈阳工业大学 一种复合吹气硬化水玻璃砂制芯用添加剂及使用方法
DE102018132235B4 (de) 2018-12-14 2022-02-17 Mecklenburger Metallguß GmbH Verfahren zur Herstellung einer Gussform
CN110860646B (zh) * 2019-12-05 2021-09-21 中铁山桥集团有限公司 一种铸造砂组合物及铸造方法
CN113263134B (zh) * 2021-05-12 2022-12-06 沈阳工业大学 一种复合硬化水玻璃砂制芯用添加剂及其应用
CN113862470B (zh) * 2021-09-28 2023-06-09 兰溪市博远金属有限公司 一种细粒级铝灰干式造球用粘结剂及细粒级铝灰造球方法
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Also Published As

Publication number Publication date
JP2016533275A (ja) 2016-10-27
EP2916976B1 (fr) 2017-03-08
CN105658352B (zh) 2018-04-20
CN105658352A (zh) 2016-06-08
DE102014221237A1 (de) 2015-04-23
ES2628255T3 (es) 2017-08-02
US20160250680A1 (en) 2016-09-01
PL2916976T3 (pl) 2017-08-31
WO2015055838A1 (fr) 2015-04-23
JP6141539B2 (ja) 2017-06-07
US10092947B2 (en) 2018-10-09

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