CN104428082A - Salt-based cores, method for production thereof and use thereof - Google Patents
Salt-based cores, method for production thereof and use thereof Download PDFInfo
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- CN104428082A CN104428082A CN201380030231.0A CN201380030231A CN104428082A CN 104428082 A CN104428082 A CN 104428082A CN 201380030231 A CN201380030231 A CN 201380030231A CN 104428082 A CN104428082 A CN 104428082A
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- core
- alkali
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- adhesive composition
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- 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
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
-
- 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
- B22C1/167—Mixtures of inorganic and organic binding agents
-
- 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
-
- 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
- B22C1/185—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 containing phosphates, phosphoric acids or its derivatives
-
- 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
- B22C9/105—Salt cores
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Mold Materials And Core Materials (AREA)
- Catalysts (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
Cores that are inserted into the mould during the die casting of workpieces from metal in order to keep the cavities provided in the workpieces free during the filling of the moulds with the melt have to meet demanding requirements with regard to their dimensional stability and suitability for removal from the cavities. Therefore, salt-based cores which can be produced by moulding and compressing a core material mixture are provided according to the invention, the core materials thereof being selected from at least one salt, at least one binder system comprising a combination of binder/binding agent and possibly auxiliary substances such as additives, fillers, wetting agents and catalysts, wherein the salt, the binder system and the possibly used auxiliary substances of the core material mixture are inorganic and these core materials are soluble with water as the solvent.
Description
The present invention relates to alkali core, the preparation method of alkali core and this core when preparing metal casting, preferably in metal casting technology for making, as the application of cavity keeper, this core by solvent from workpiece completely and successfully remove and do not stay solid residue.
To inserting when casting metal workpiece in mould with proposing high requirement with the core reserving cavity predetermined in workpiece during this mould of melt filling.This core must be able to be easy to prepare, dimensionally stable and profile accurately and its solvent prepared material used and dissolve this core to casting property and environmental effects and should should not cause health hazard.
If have special requirement to the surface of the cavity of this workpiece and profile accuracy, then this core surface must smooth especially and profile accurate, and this core must be dissolved in suitable solvent neutralization is completely easy to removal from the cavity of this workpiece and does not stay solid residue.The residue of the core containing insoluble components such as quartz sand can cause treating refining surface damage or causing compressor emergency shutdown, such as, when core residue causes the blocking of nozzle in the common rail system of diesel engine unit.
Now can by means of so-called dry type pressing, external heat stress is not only stood without the need to sintering process subsequently or the preparation of recrystallization technique, also through benefiting from the alkali core of the mechanical stress produced when molten metals in liquid state encloses casting (Umguss), there is high strength on the one hand and can be easy to after pouring on the other hand remove from foundry goods and in foundry goods, leave the core of smooth surface characteristics as well as possible.
The object of the invention is to, manufacture the alkali core with little porosity, good surface quality and intensity high as far as possible, this core can easily and fully be removed after workpiece casting from this workpiece.
Another object of the present invention is to, with the method for forming that is simple as far as possible and low cost, prepare this core preferably by so-called dry type pressing.
Another object of the present invention is to, improve this dry type pressing and provide intensity to have obvious improvement, and still can after pouring easily and fully remove from this workpiece, and the core of the smooth surface characteristic stayed in foundry goods.
According to the present invention, described object is achieved according to the method for main claim and claim 31.Advantageous scheme of the present invention characterizes in dependent claims.
Core of the present invention is made up of salt, and this salt can be mixed with special adhesive with the auxiliary agent selected as filler, additive, wetting agent and catalyst.This core is preferred for the workpiece poured into a mould by non-ferrous metal such as aluminium, brass or copper in metal casting technology for making.Core of the present invention is made up of many kinds of substance, and these materials preferably can be removed without residue from workpiece cavity as the water of solvent with based on environmental grounds.
The advantage of core of the present invention is, it is made up of the material (=core) of the reaction never having evolved gas when dealing carefully with, equal environmental sound when these materials are in its preparation and casting process.Because also do not produce the pyrolysis product of organic bond when pouring into a mould, so the quality due to the pouring defect caused by the core gas owing to producing can be avoided as casting bubble, pore etc. to improve foundry goods.The residue needing special disposal is not formed when removing core from workpiece.Depend on composition by suitable method by reclaiming these materials in liquid phase, such as, reclaim this salt by spraying dry or evaporation.
The all components of this core material all can pass through compaction process in the machinery of routine or hydraulic press.The geometric complexity of this core determines Fabrication parameter and for the preparation of the instrument of this core and the shape of press and structural design.
The salt of alkali metal and alkali earth metal is as particularly sodium chloride, potassium chloride and magnesium chloride, the sulfate and nitrate of alkali metal and alkali earth metal is as particularly potassium sulfate, magnesium sulfate, and ammonium salt such as particularly ammonium sulfate is all suitable as the core material of core of the present invention.The water miscible representative of this core material is preferred.These materials can be used alone or also can be used as mixture and use, as long as it does not mutually react and has a negative impact to desired characteristic thus, because this core material should not occur when prepared by core to remove to it mass transfer had a negative impact without residue.Usual decomposition point or fusing point all applicable higher than all diffluent salt of this melted metal temperature.With sand facies ratio, this core material can be easy to and be classified into desired granularity or grain grade simply.The surface characteristic of this core is subject to the impact of selected size distribution and selected compactness especially.Granularity is less, and surface is more smooth.Usually make every effort to compactness high as far as possible, this has the different salt of different distributions curve by mixing and optional added substance realizes, such as, realized by the size distribution at bimodal or three peaks in mixture.
Depend on the core material of the workpiece that will pour into a mould, desired surface quality and profile accuracy, granularity of the present invention is preferably in the scope of 0.01-2 mm.Depend on desired compactness, with different ratios mixing 0.01-0.29 mm, the granularity fraction of 0.3-1.3 mm and/or 1.31-2.0 mm.
Equally can by the water as solvent completely and the filler removed without residue can the salt of optional Substitute For Partial, as long as have no adverse effect to density and intensity thus.The present invention shows, and the salt of 30 % by weight can be substituted by corresponding filler at the most.The granularity of this filler should match with the granularity of this salt or size distribution.
For guaranteeing the required stability of this core after moulding process, add at least one adhesive at this salt of compacting forward direction.
Solution of the present invention based on the object of the invention uses special adhesive composition, and this adhesive composition is made up of adhesive/binding agent and the drier that matches with it.
In this adhesive composition of the present invention, all water that can be used as solvent after hardening process can be used in principle to remove and can the adhesive/binding agent of this salt effectively moistening and optional added substance without residue, and the mixture of these materials necessarily can be configured as the core that will disappear by compacting thus.Usually, the mixture of inorganic phosphate, inorganic borate, silicate compound or these binding agents is suitable as adhesive/binding agent, as long as its water that can be used as solvent is removed without residue.Such as alkali metal phosphate or ammonium phosphate, monoaluminum phosphate, boron phosphate, tertiary sodium phosphate, tetrapotassium pyrophosphate or sodium polyphosphate can be used as inorganic phosphate.
Preferably can use the adhesive/binding agent be made up of the water-soluble water glass of water-soluble silicate if modulus of water glass is 1-5, the waterglass wherein with different modulus of water glass also can be used as mixture to be existed.Depend on modulus of water glass used, depend on wetting characteristics, this addition is 0.5 % by weight-15 % by weight, preferably 5 % by weight-8 % by weight.For reaching characteristic needed for follow-up casting as intensity and shape stability, also special binder combination can be used.
For this core material is processed into available core further, the most important thing is this core material with what form exists.As in the present invention, if need solid-state version core material, so very importantly this core material whether reunite or depolymerization and its whether exist with loose shape.Only loose core material-mixture independently and fully could be full of so-called filling groove (F ü llschuhe) in the method for forming preferred for this invention and dry type pressing.Therefore, the loose mixture be made up of salt, adhesive composition used and other admixture just can be used as core material in dry type pressing.
But for greatly improving the core material of the dry type pressing that can be used in the manner of the present invention, importantly improve the shatter value of this core material further, particularly when applying above-mentioned adhesive/binding agent.
According to the present invention, this by according to selected adhesive/binding agent, adds drier in right amount and is achieved surprisingly.Adhesive/binding agent and drier collectively form adhesive specially system provided by the present invention.Object of the present invention can be realized unexpectedly with this adhesive composition.
All can hydroaropic substance that reversibly namely absorbed water can be discharged by suitable process by Bound moisture again be all suitable as the present invention can drier.According to the present invention, silica such as Aerosil, silica gel, zeolite, anhydrous sodium sulfate and/or the magnesium sulfate of such as high degree of dispersion all can be used as this kind of drier.Due to its chemistry and architectural characteristic, these drier locking hydrones, and change its spatial molecular structure by intermolecular power subsequently.Thus, hydrone no longer can be overflowed from this structure, and keeps when processing this core material combining.The water of this combination can be disengaged again by heat effect.
According to the present invention, the addition of this drier always depends on the type used of adhesive/binding agent and amount and determines, and easily draws by simply testing.Allowing little over amount of this drier.
Use such as based on the waterglass of halometer 1-5 % by weight used as adhesive/binding agent time, Aerosil based on the high degree of dispersion of halometer 0.3-1.5 % by weight used is just enough to as drier available in the present invention the shatter value not only ensureing this core material, and with containing based on the waterglass of halometer 1-5 % by weight used as adhesive/binding agent but not containing drier core material compared with, it can improve the shatter value of this core material.
By using the adhesive specially system of the present invention be made up of the combination of adhesive/binding agent and drier, also adhesive/the binding agent be in a liquid state can be used when processing type core material first.By using liquid adhesive/binding agent, significantly improve the wetting of the core material component with adhesive/binding agent.Thus can this core material component coated, particularly by salt grain that adhesive/binding agent surrounds.Result obtains a kind of salt core made obviously improved in its intensity.According to the present invention, the tetrapotassium pyrophosphate aqueous solution of such as 60% can be used as fluid binder.Based on halometer used, in this scheme, add 1-5 % by weight, preferred 2-4 % by weight, particularly preferably 2.5 % by weight 60% the tetrapotassium pyrophosphate aqueous solution.But for guaranteeing the shatter value desired by this core material, in the core material in this way by the coated mistake of adhesive, add the drier provided by the invention of q.s.In the case, this drier little over amount also allow.
If additionally add in this tetrapotassium pyrophosphate aqueous solution of 60% equivalent or more amount solid-state tetrapotassium pyrophosphate salt be particularly advantageous.
By add targetedly additive to affect by salt, optional auxiliary agent as additive, filler, wetting agent and/or catalyst and special adhesive composition of the present invention the characteristic of mixture of the present invention that forms.In this its prerequisite be also, these additives or these additives can be easy to complete with the product as the water of solvent and remove by the cavity of workpiece without residue, and do not disengage when pouring into a mould gas casting process being had to the caused pouring defect of adverse effect.By the composition of this core material, these additives can be selected from: wetting agent as the thermophysical property of surfactant, the additive affecting the denseness of this mixture, lubricant, solution reunion additive, gelling agent, change core as thermal conductivity additive, prevent the additive of metal adhesion on core, cause the additive of better homogeneity and miscibility, improve additive that can be depot, additive that the additive and causing that prevents from preventing from smoldering and being formed when the additive of premature hardening, cast condensate hardens acceleration.These additives are that the professional of conventional core preparation field is known.Its addition is determined according to the kind of this core material and composition.
For improving necessary intensity after dry type compacting further, depend on that composition needs of this core material use and the initiation that matches of this core material and accelerate the catalyst that this core material hardens.
Show unexpectedly, add the salt of special particulate, preferably add the effect that powdery salt that granularity is less than 100 nm creates hardening catalyst.
If made in the present invention by gaseous catalyst, then after dry type compacting, the gas that core material is worked can be blown into, preferred CO in still closed mould
2or air, for solidification and this core dry.Pressure is at most 5 bar.
Also at the temperature of 600 DEG C at the most, preferably at the temperature of 500 DEG C-600 DEG C, heat treatment can be carried out particularly preferably at the temperature of 580 DEG C to this core.
This core material by salt and adhesive composition and, if necessary, added substance is as filler, additive and catalyst composition, and wherein this filler and adhesive composition are inorganic.All materials can carry out Homogeneous phase mixing with known mixing unit.The addition of adhesive composition and added substance need be selected according to the application purpose of this core, and determines the surface quality of this core and density and intensity.
Preparation and the production process of this core material are separated and are carried out, and at this, optionally suitable safeguard measure must be provided to prevent from reuniting and premature hardening.Such as can implement preparation, transport and storage under protection gas or vacuum according to the composition of this core material.
The quality of constituent and properties to foundry goods of core has significant impact.
The density of the salt core based on sodium chloride prepared in accordance with the present invention is generally 1.5 g/cm
3-1.9 g/cm
3, preferably 1.2 g/cm
3-1.8 g/cm
3, measure according to buoyancy method.Corresponding porosity is 10-35 %, preferred 5-25 %.The bending strength measured by VDG-badge card P73 is 400 N/cm
2-1500 N/cm
2.
Therefore, the most heavy characteristic is set forth by embodiment below.Given characteristic is relevant with the core not using mold wash coated.
Use by NaCl and following added substance as waterglass-adhesive, as the Aerosil of the high degree of dispersion of drier and other additives as releasing agent, set retarder, wetting agent etc.This core uses the pressure forming of 50-120 bar in hydraulic press.The hot type post processing of 60 min is stood with sclerosis at 580 DEG C.This core is particularly suitable for using in aluminum metal mold casting.The temperature that occurs and power during for tolerating cast, this core necessarily dimensionally stable.To being of a size of 180 mm are long, 22 mm are wide and 22 mm the are high Specimen Determination mechanical property of this core.Be 400-1500 N/cm according to the bending strength that VDG-badge card P73 (in February, 1996) measures
2.
Fashionable at metal flow, do not allow to wash out the surface of this core or make it impaired.Therefore, this core must have corresponding surface strength.Porosity also plays a decisive role.Hole ratio is 30 % in this embodiment.
After foundry goods solidifies completely, this core must be removed.It is important in this that, this core can easily dissolve at once and without solid residue ground completely.(note: refer to " water miscible ", " dissolving " or " completely dissolve " in the scope of the invention, therefore to this and not necessarily refers to the chemical concept of dissolving.Significantly, these components of core of the present invention are by changing places as the water capacity of solvent completely and removing from the cavity of workpiece without residue).The dissolution velocity of this core is certainly relevant with this core material and pretreatment thereof and granularity.In pure salt situation, dissolution velocity is different from the composition containing adhesive and filler.Show with the experiment of test specimen, in 1-2 min, the core being of a size of 22 mm x 22 mm x 180 mm can be washed out completely from foundry goods with hot water.
Drawn by above-mentioned, instruction of the present invention relates to alkali core:
This core is prepared by the shaping of core material-mixture and compacting, its core material is selected from least one salt, adhesive composition that at least one is made up of adhesive/binding agent and drier and optional auxiliary agent as additive, filler, wetting agent and catalyst, wherein this salt, adhesive composition and the optional auxiliary agent used are inorganic, these core material available water are as dissolution with solvents, and this core material-mixture is molded into core and with the compacting of dry type pressing.
This core is preferably made up of core material-mixture,
Wherein use decomposition point or fusing point higher than the salt enclosing the liquid metal temperature of casting this core.
Wherein use the chloride of alkali metal and alkali earth metal, particularly sodium chloride, potassium chloride and/or magnesium chloride, the sulfate and nitrate of alkali metal and alkali earth metal, particularly potassium sulfate and/or magnesium sulfate, the mixture of ammonium salt, particularly ammonium sulfate or these salt is as salt;
Wherein this salt is sodium chloride;
Wherein the granularity of used salt is in the scope of 0.01 mm-2 mm.
Wherein used salt is bimodal or three peak size distribution existence;
Wherein used salt exists with the size distribution of 0.01-0.29 mm, 0.3-1.3 mm and/or 1.31-2.0 mm;
Wherein use in this adhesive composition can with water without residue the mixture of inorganic phosphate, inorganic borate, silicate compound or these adhesive/binding agents removed as adhesive/binding agent;
Wherein use in this adhesive composition can with water without residue the mixture of the alkali metal phosphate removed or ammonium phosphate, monoaluminum phosphate, boron phosphate, tertiary sodium phosphate, tetrapotassium pyrophosphate or sodium polyphosphate or these adhesive/binding agents as adhesive/binding agent;
Wherein in this adhesive composition, use water miscible silicate compound, preferred water glass is as adhesive/binding agent;
Wherein in this adhesive composition, the waterglass of this adhesive to be modulus of water glass be 1-5 and/or there is the mixture of waterglass of different modulus of water glass;
Wherein the content of this adhesive/binding agent is for based on used salt meter 0.5 % by weight-15 % by weight;
Wherein this depends on wetting agent characteristic and modulus of water glass, and the content of this adhesive/binding agent is for based on used salt meter 0.5 % by weight-15 % by weight;
Wherein depend on size distribution and mate with the modulus of waterglass, comprising waterglass based on the content of used salt meter 0.5 % by weight-15 % by weight as adhesive/binding agent;
Wherein in this adhesive composition, this adhesive is tetrapotassium pyrophosphate;
Wherein in this adhesive composition, this adhesive uses liquid tetrapotassium pyrophosphate;
Wherein in this adhesive composition, this adhesive uses the aqueous solution of 60% of tetrapotassium pyrophosphate;
Wherein in this adhesive composition, this adhesive uses the aqueous solution of 60% of tetrapotassium pyrophosphate, and its consumption is based on halometer 1-5 % by weight used, preferred 2-4 % by weight, and particularly preferably 2.5 % by weight;
Wherein in this adhesive composition, this adhesive uses the aqueous solution of 60% of tetrapotassium pyrophosphate, and its consumption is based on halometer 1-5 % by weight used, preferred 2-4 % by weight, particularly preferably 2.5 % by weight, and the extra solid-state tetrapotassium pyrophosphate using identical amount or more amount;
Wherein in this adhesive composition, comprise based on the adhesive of the ratio of halometer 1-15 % by weight used and the drier based on halometer 0.3-4.5 % by weight used;
Wherein in this adhesive composition, use the hydroaropic substance of reversibly Bound moisture as drier;
Wherein in this adhesive composition, use the silica of high degree of dispersion if Aerosil, silica gel, zeolite, anhydrous sodium sulfate and/or magnesium sulfate are as drier;
Wherein add catalyst as auxiliary agent;
Wherein this catalyst is the salt of special particulate, and preferably granularity is less than the powdery salt of 100 nm;
Wherein this salt is sodium chloride, it preferably exists in bimodal or three peak size distribution, particularly preferably with 0.01-0.29 mm, the size distribution of 0.3-1.3 mm and/or 1.31-2.0 mm exists, this adhesive composition is made up of the combination of adhesive waterglass and drier Aerosil, this catalyst is the salt of special particulate, preferably granularity is less than the powdery salt of 100 nm, optional other auxiliary agent that contains is as additive, filler, wetting agent and/or other catalyst, and the mixture of this core material is loose;
Wherein this core is after shaping through heat treatment;
Wherein this core is after shaping at the temperature of the highest 600 DEG C, preferably at the temperature of 500-600 DEG C, especially heat-treats at the temperature of 580 DEG C;
Wherein the density of this shaping core is 1.5 g/cm
3-2.1 g/cm
3, preferably 1.2 g/cm
3-1.8 g/cm
3;
Wherein the porosity of this shaping core is 10%-40 %, preferred 5%-25 %;
Wherein the bending strength of this shaping core is 400 N/cm
2-1500 N/cm
2.
Instruction of the present invention also relates to:
For the preparation of the method for this alkali core, wherein by core material-mixture Homogeneous phase mixing, be shaped to core, with the compacting of dry type pressing and optional heat treatment, the core material of this core material-mixture is selected from least one salt, adhesive composition that at least one is made up of adhesive/binding agent and drier and optional auxiliary agent as additive, filler, wetting agent and catalyst.
The method preferably, wherein:
Use has different distributions curve, preferably in salt that is bimodal or three peak size distribution, and is mixed;
Select the chloride of alkali metal and alkali earth metal, particularly sodium chloride, potassium chloride and/or magnesium chloride, the sulfate and nitrate of alkali metal and alkali earth metal, particularly potassium sulfate and/or magnesium sulfate, and the mixture of ammonium salt, particularly ammonium sulfate or these salt is as salt;
Use can with water without residue the mixture of inorganic phosphate, inorganic borate, silicate compound or these adhesive/binding agents removed as the adhesive/binding agent in this adhesive composition;
Use can with water without residue the mixture of the alkali metal phosphate removed or ammonium phosphate, monoaluminum phosphate, boron phosphate, tertiary sodium phosphate, tetrapotassium pyrophosphate or sodium polyphosphate or these adhesive/binding agents as the adhesive/binding agent in this adhesive composition;
Use water miscible silicate compound, preferred water glass is as adhesive/binding agent in this adhesive composition;
The waterglass of to be modulus of water glass the be 1-5 of the adhesive in this adhesive composition and/or there is the mixture of waterglass of different modulus of water glass;
The content of adhesive/binding agent is for based on used salt meter 0.5 % by weight-15 % by weight;
Depend on wetting agent characteristic and modulus of water glass, the content of this adhesive/binding agent is for based on used salt meter 0.5 % by weight-15 % by weight;
Depend on size distribution and mate with the modulus of waterglass, comprising waterglass based on the content of used salt meter 0.5 % by weight-15 % by weight as adhesive/binding agent;
Use the hydroaropic substance of reversibly Bound moisture as the drier in this adhesive composition;
Use the silica of high degree of dispersion if Aerosil, silica gel, zeolite, anhydrous sodium sulfate and/or magnesium sulfate are as the drier in this adhesive composition;
Add catalyst as auxiliary agent;
This catalyst is the salt of special particulate, and preferably granularity is less than the powdery salt of 100 nm;
This salt is sodium chloride, it preferably exists in bimodal or three peak size distribution, particularly preferably with 0.01-0.29 mm, the size distribution of 0.3-1.3 mm and/or 1.31-2.0 mm exists, this adhesive composition is made up of the combination of adhesive waterglass and drier Aerosil, and this catalyst is the salt of special particulate, and preferably granularity is less than the powdery salt of 100 nm, optional other auxiliary agent that contains is as additive, filler, wetting agent and/or other catalyst, and the mixture of this core material is loose;
By this core material-mixture Homogeneous phase mixing, be shaped to core and with the compacting of dry type pressing;
Depend on the material of the workpiece will poured into a mould by metal, desired surface quality and profile accuracy, use granularity at the core material of 0.01mm-2 mm scope, be shaped to core and with the compacting of dry type pressing;
This core of heat treatment after shaping;
This core, after shaping at the temperature of the highest 600 DEG C, preferably at the temperature of 500-600 DEG C, is especially heat-treated at the temperature of 580 DEG C.
Core of the present invention such as when preparing metal casting, preferably can be used as cavity keeper with metal casting technology for making.
Claims (47)
1. alkali core, it is prepared by the shaping of core material-mixture and compacting, its core material is selected from least one salt, adhesive composition that at least one is made up of adhesive/binding agent and drier and optional auxiliary agent as additive, filler, wetting agent and catalyst, the auxiliary agent of wherein said salt, described adhesive composition and described optional use is inorganic, described core material available water is as dissolution with solvents, and described core material-mixture is shaped to core and with the compacting of dry type pressing.
2. alkali core according to claim 1, is characterized in that, uses decomposition point or fusing point higher than the salt of the temperature for enclosing the liquid metal casting described core.
3. according to the alkali core of claim 1 or 2, it is characterized in that, use the chloride of alkali metal and alkali earth metal, particularly sodium chloride, potassium chloride and/or magnesium chloride, the sulfate and nitrate of alkali metal and alkali earth metal, particularly potassium sulfate and/or magnesium sulfate, the mixture of ammonium salt particularly ammonium sulfate or these salt is as salt.
4. according to the one or more alkali core of the claims, it is characterized in that, described salt is sodium chloride.
5. according to the one or more alkali core of the claims, it is characterized in that, the granularity of used salt is in the scope of 0.01mm-2 mm.
6. according to the one or more alkali core of the claims, it is characterized in that, used salt is bimodal or three peak size distribution exist.
7. according to the one or more alkali core of the claims, it is characterized in that, used salt exists with the size distribution of 0.01-0.29 mm, 0.3-1.3 mm and/or 1.31-2.0 mm.
8. according to the one or more alkali core of the claims, it is characterized in that, using as adhesive/binding agent in described adhesive composition can with water without the mixture of inorganic phosphate, inorganic borate, silicate compound or these adhesive/binding agents removed of residue ground.
9. according to the one or more alkali core of the claims, it is characterized in that, using as adhesive/binding agent in described adhesive composition can with water without the residue ground mixture of the alkali metal phosphate removed or ammonium phosphate, monoaluminum phosphate, boron phosphate, tertiary sodium phosphate, tetrapotassium pyrophosphate or sodium polyphosphate or these adhesive/binding agents.
10., according to the one or more alkali core of the claims, it is characterized in that, in described adhesive composition, use water miscible silicate compound as adhesive/binding agent, preferred water glass.
11., according to the one or more alkali core of the claims, is characterized in that, in described adhesive composition, and the waterglass of described adhesive to be modulus of water glass be 1-5 and/or there is the mixture of waterglass of different modulus of water glass.
12., according to the one or more alkali core of the claims, is characterized in that, the content of described adhesive/binding agent between 0.5 % by weight-15 % by weight, based on used salt meter.
13., according to the one or more alkali core of the claims, is characterized in that, depend on wetting characteristics and modulus of water glass, the content of described adhesive/binding agent between 0.5 % by weight-15 % by weight, based on used salt meter.
14., according to the one or more alkali core of the claims, is characterized in that, depend on size distribution and be adapted to modulus of water glass, comprising based on used salt meter content is that the waterglass of 0.5 % by weight-15 % by weight is as adhesive/binding agent.
15. according to the one or more alkali core of the claims, and it is characterized in that, in described adhesive composition, described adhesive is tetrapotassium pyrophosphate.
16., according to the one or more alkali core of the claims, is characterized in that, in described adhesive composition, described adhesive uses the tetrapotassium pyrophosphate of liquid form.
17., according to the one or more alkali core of the claims, is characterized in that, in described adhesive composition, described adhesive uses the aqueous solution of 60% of tetrapotassium pyrophosphate.
18., according to the one or more alkali core of the claims, is characterized in that, in described adhesive composition, described adhesive uses the aqueous solution of 60% of tetrapotassium pyrophosphate, and its consumption is 1-5 % by weight based on halometer used, preferred 2-4 % by weight, particularly preferably 2.5 % by weight.
19. according to the one or more alkali core of the claims, it is characterized in that, in described adhesive composition, described adhesive uses the aqueous solution of 60% of tetrapotassium pyrophosphate, and its consumption is 1-5 % by weight based on halometer used, preferred 2-4 % by weight, particularly preferably 2.5 % by weight, and use solid-state tetrapotassium pyrophosphate so that identical amount or more amount is extra.
20., according to the one or more alkali core of the claims, is characterized in that, comprise based on the adhesive of halometer 1-15 % by weight ratio used and the drier based on halometer 0.3-4.5 % by weight used in described adhesive composition.
21., according to the one or more alkali core of the claims, is characterized in that, in described adhesive composition, use the hydroaropic substance of reversibly Bound moisture as drier.
22., according to the one or more alkali core of the claims, is characterized in that, in described adhesive composition, use the silica of high degree of dispersion if Aerosil, silica gel, zeolite, anhydrous sodium sulfate and/or magnesium sulfate are as drier.
23., according to the one or more alkali core of the claims, is characterized in that, add catalyst as auxiliary agent.
24. according to the one or more alkali core of the claims, and it is characterized in that, described catalyst is the salt of special particulate, and preferably granularity is less than the powdery salt of 100 nm.
25. according to the one or more alkali core of the claims, it is characterized in that, described salt is sodium chloride, it preferably exists in bimodal or three peak size distribution, particularly preferably with 0.01-0.29 mm, the size distribution of 0.3-1.3 mm and/or 1.31-2.0 mm exists, described adhesive composition is made up of the combination of adhesive waterglass and drier Aerosil, described catalyst is the salt of special particulate, preferably granularity is less than the powdery salt of 100 nm, optional other auxiliary agent that contains is as additive, filler, wetting agent and/or other catalyst, and the mixture of described core material is loose.
26. according to the one or more alkali core of the claims, and it is characterized in that, described core is after shaping through heat treatment.
27., according to the one or more alkali core of the claims, is characterized in that, described core after shaping at the temperature of the highest 600 DEG C, preferably at the temperature of 500-600 DEG C, especially at the temperature of 580 DEG C through heat treatment.
28. according to the one or more alkali core of the claims, and it is characterized in that, described have 1.5 g/cm through shaping core
3-2.1 g/cm
3, preferably 1.2 g/cm
3-1.8 g/cm
3density.
29. according to the one or more alkali core of the claims, and it is characterized in that, described have 10%-40 % through shaping core, the porosity of preferred 5%-30 %.
30. according to the one or more alkali core of the claims, and it is characterized in that, described have 400 N/cm through shaping core
2-1500 N/cm
2bending strength.
31. for the preparation of the method for described alkali core, wherein core material-mixture through Homogeneous phase mixing, be shaped to core, with dry type pressing compacting optionally heat-treating, the core material of described core material-mixture is selected from least one salt, adhesive composition that at least one is made up of adhesive/binding agent and drier and optional auxiliary agent as additive, filler, wetting agent and or catalyst.
32., according to the method for claim 31, is characterized in that, use the granularity with different distributions curve, preferably in salt that are bimodal or three peak size distribution, and are mixed.
33. according to the method for claim 31 or 32, it is characterized in that, select the chloride of alkali metal and alkali earth metal, particularly sodium chloride, potassium chloride and/or magnesium chloride, the sulfate and nitrate of alkali metal and alkali earth metal, particularly potassium sulfate and/or magnesium sulfate, and the mixture of ammonium salt, particularly ammonium sulfate or these salt is as salt.
34. according to the one or more method of said method claim, it is characterized in that, can without the mixture of inorganic phosphate, inorganic borate, silicate compound or these adhesive/binding agents removed of residue ground as the adhesive in described adhesive composition/binding agent use water.
35. according to the one or more method of said method claim, it is characterized in that, can without the residue ground mixture of the alkali metal phosphate removed or ammonium phosphate, monoaluminum phosphate, boron phosphate, tertiary sodium phosphate, tetrapotassium pyrophosphate or sodium polyphosphate or these adhesive/binding agents as the adhesive in described adhesive composition/binding agent use water.
36. according to the one or more method of said method claim, and it is characterized in that, use water miscible silicate compound, preferred water glass is as the adhesive/binding agent in described adhesive composition.
37., according to the one or more method of said method claim, is characterized in that, the waterglass of to be modulus of water glass the be 1-5 of the adhesive in described adhesive composition and/or have the mixture of waterglass of different modulus of water glass.
38., according to the one or more method of said method claim to a method, is characterized in that, use the hydroaropic substance of reversibly Bound moisture as the drier in described adhesive composition.
39., according to the one or more method of said method claim, is characterized in that, use the silica of high degree of dispersion as Aerosil, silica gel, zeolite, anhydrous sodium sulfate and/or magnesium sulfate as described in drier in adhesive specially system.
40., according to the one or more method of said method claim, is characterized in that, add catalyst as auxiliary agent.
41. according to the one or more method of said method claim, and it is characterized in that, described catalyst is the salt of special particulate, and preferably granularity is less than the powdery salt of 100 nm.
42. according to the one or more method of said method claim, it is characterized in that, described salt is sodium chloride, it preferably exists in bimodal or three peak size distribution, particularly preferably with 0.01-0.29 mm, the size distribution of 0.3-1.3 mm and/or 1.31-2.0 mm exists, described adhesive composition is made up of the combination of adhesive waterglass and drier Aerosil, described catalyst is the salt of special particulate, preferably granularity is less than the powdery salt of 100 nm, optional other auxiliary agent that contains is as additive, filler, wetting agent and/or other catalyst, and the mixture of described core material is loose.
43., according to the one or more method of said method claim, is characterized in that, by described core material Homogeneous phase mixing, are shaped to core and with the compacting of dry type pressing.
44. according to the one or more method of said method claim, it is characterized in that, according to will by the material of the workpiece of casting of metals, desired surface quality and profile accuracy, use granularity at the core material of 0.01mm-2 mm scope, be shaped to core and with the compacting of dry type pressing.
45., according to the one or more method of said method claim, is characterized in that, heat-treat after shaping described core material.
46. according to the one or more method of said method claim, and it is characterized in that, described core, after shaping at the temperature of the highest 600 DEG C, preferably at the temperature of 500-600 DEG C, is especially heat-treated at the temperature of 580 DEG C.
47. according to the one or more alkali core of claim 1-20 when preparing metal casting, preferably in metal casting technology for making, as the application of cavity keeper.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012205767 | 2012-04-10 | ||
| DE102012205767.6 | 2012-04-10 | ||
| PCT/EP2013/001054 WO2013152851A2 (en) | 2012-04-10 | 2013-04-10 | Salt-based cores, method for the production thereof and use thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104428082A true CN104428082A (en) | 2015-03-18 |
Family
ID=48607195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380030231.0A Pending CN104428082A (en) | 2012-04-10 | 2013-04-10 | Salt-based cores, method for production thereof and use thereof |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20150060005A1 (en) |
| EP (1) | EP2836318A2 (en) |
| CN (1) | CN104428082A (en) |
| DE (1) | DE102013006135A1 (en) |
| MX (1) | MX2014012219A (en) |
| RU (1) | RU2014144721A (en) |
| WO (1) | WO2013152851A2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105964893A (en) * | 2016-02-18 | 2016-09-28 | 蚌埠市鸿安精密机械有限公司 | Bagasse pulp-containing water-soluble mold core and preparation method thereof |
| CN105964936A (en) * | 2016-02-18 | 2016-09-28 | 蚌埠市鸿安精密机械有限公司 | Wood pulp fiber-enhanced water-soluble mold core and preparation method thereof |
| CN108602211A (en) * | 2015-11-21 | 2018-09-28 | H2K矿物有限责任公司 | Mold, its manufacturing method and purposes |
| CN111940684A (en) * | 2020-07-21 | 2020-11-17 | 中国第一汽车股份有限公司 | Water-soluble composite salt core for high-pressure casting |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015014711A1 (en) | 2013-07-24 | 2015-02-05 | Emil Müller GmbH | Salt core and additive manufacturing method for producing salt cores |
| CN106573812B (en) * | 2014-07-10 | 2019-05-10 | 松下知识产权经营株式会社 | Antisludging agent, scale inhibition equipment and scale inhibition system using it |
| EP3181264A1 (en) | 2015-10-26 | 2017-06-21 | Emil Müller GmbH | Salt core and method for producing salt cores |
| KR102478505B1 (en) | 2016-12-23 | 2022-12-15 | 현대자동차주식회사 | Saltcore For Die-casting with Aluminum and the Method Therefor |
| US10682692B2 (en) | 2018-01-08 | 2020-06-16 | Ford Motor Company | Method for providing preformed internal features, passages, and machining clearances for over-molded inserts |
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| DE102005018614B4 (en) * | 2005-04-21 | 2016-07-28 | Emil Müller GmbH | Process for the preparation of water-soluble salt cores |
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- 2013-04-10 RU RU2014144721A patent/RU2014144721A/en not_active Application Discontinuation
- 2013-04-10 EP EP13728105.1A patent/EP2836318A2/en not_active Withdrawn
- 2013-04-10 MX MX2014012219A patent/MX2014012219A/en unknown
- 2013-04-10 DE DE201310006135 patent/DE102013006135A1/en not_active Withdrawn
- 2013-04-10 US US14/391,094 patent/US20150060005A1/en not_active Abandoned
- 2013-04-10 CN CN201380030231.0A patent/CN104428082A/en active Pending
- 2013-04-10 WO PCT/EP2013/001054 patent/WO2013152851A2/en active Application Filing
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| US4875517A (en) * | 1989-05-01 | 1989-10-24 | Brunswick Corporation | Method of producing salt cores for use in die casting |
| EP0613742A1 (en) * | 1993-03-05 | 1994-09-07 | Puget Corporation | Die casting using casting salt cores |
| US7022178B1 (en) * | 1999-10-26 | 2006-04-04 | Hydro Aluminium Deutschland Gmbh | Binding agent, core sand mixture and a method for producing the same |
| DE10311606B3 (en) * | 2003-03-14 | 2004-12-09 | Laempe + Gies Gmbh | Forms and cores containing magnesium sulphate with phosphate / borate additive and their manufacture and use |
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| CN108602211A (en) * | 2015-11-21 | 2018-09-28 | H2K矿物有限责任公司 | Mold, its manufacturing method and purposes |
| CN105964893A (en) * | 2016-02-18 | 2016-09-28 | 蚌埠市鸿安精密机械有限公司 | Bagasse pulp-containing water-soluble mold core and preparation method thereof |
| CN105964936A (en) * | 2016-02-18 | 2016-09-28 | 蚌埠市鸿安精密机械有限公司 | Wood pulp fiber-enhanced water-soluble mold core and preparation method thereof |
| CN111940684A (en) * | 2020-07-21 | 2020-11-17 | 中国第一汽车股份有限公司 | Water-soluble composite salt core for high-pressure casting |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102013006135A1 (en) | 2013-10-10 |
| MX2014012219A (en) | 2015-06-05 |
| WO2013152851A2 (en) | 2013-10-17 |
| EP2836318A2 (en) | 2015-02-18 |
| RU2014144721A (en) | 2016-06-10 |
| WO2013152851A3 (en) | 2014-03-20 |
| US20150060005A1 (en) | 2015-03-05 |
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