CN105283258A - Core for precision casting, production method therefor, and mold for precision casting - Google Patents
Core for precision casting, production method therefor, and mold for precision casting Download PDFInfo
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- CN105283258A CN105283258A CN201480029889.4A CN201480029889A CN105283258A CN 105283258 A CN105283258 A CN 105283258A CN 201480029889 A CN201480029889 A CN 201480029889A CN 105283258 A CN105283258 A CN 105283258A
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- mold
- investment casting
- hot investment
- silica flour
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/06—Permanent moulds for shaped castings
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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
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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
- B22C1/16—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
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- 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
- B22C9/04—Use of lost patterns
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Dispersion Chemistry (AREA)
- Mold Materials And Core Materials (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
A core for precision casting, comprising a precision casting core main body formed as a result of mixing and sintering silica particles and silica fume. A precision casting core having silica fume added thereto has smaller resistance during heating/injection molding and improved fluidity as a result of silica fume addition. As a result, injection molding pressure when producing cores can be reduced because fluidity is improved. Furthermore, the present invention can be applied to thin-walled molded articles requiring improved fluidity and molded articles having a complicated shape.
Description
Technical field
The present invention relates to hot investment casting core and manufacture method, hot investment casting mold.
Background technology
As hot investment casting product, such as, there is the movable vane for gas turbine.Gas turbine makes working fluid combustion with burner and becomes the working fluid of HTHP, utilizes this working fluid that turbine is rotated.That is, make the working fluid combustion through compressor compresses with burner, improve energy, reclaim this energy with turbine and make it to produce revolving force, generating electricity thus.Be provided with turbine rotor in turbine portion, be at least provided with more than one gas turbine movable vane in the periphery of this turbine rotor.
At this, because the turbo blade of land gas turbine and jet engine is exposed to the open air at high temperature, so have the cooling construction (airport) of the complexity of the cooling medium (air) for cooling of circulating in inside.In order to form such internal cooling structure, and configure the core (siliceous) of the circulation path similar shape of (setting) and cooling medium in the inside of mold, by carrying out casting, cooling and obtain metal casting.At this moment, profile can be obtained by smashing mold, but for wherein leaving the state of core, in order to it be removed, usually utilize alkali (NaOH and KOH etc.) to carry out dissolving removing.
Therefore, need core to have dissolubility to alkali, use siliceous material (SiO
2) (patent document 1).
At this, hot investment casting core is the method shaping molten silica (SiO by injection molded or slip-casting etc.
2) etc. siliceous material after, heat-treat and obtain.
Injection molding be by ceramic powders and wax mixing after, by making the injection of material of wax heating and melting be injected in mould, obtain the method for formed products by making it cooling curing.
In addition, it is be mixed in by the powder of pottery among water etc. to make slurry that slip-casting is shaped, be injected into the systems such as gypsum can absorbent solution material shaping dies in, carry out method that is dry and that be shaped.
Prior art document
Patent document
Patent document 1: Japanese Unexamined Patent Publication 6-340467 publication
, the block material that in general this siliceous material is pulverizing electroquartz and obtains is made, and therefore there is the thicker such problem of granularity.Use and such material is configured as core shape with the method for injection molded etc., and the product of heat-treating (burning till) and obtaining, but because granularity is thick, so the intensity of sintered body is low.
In addition, because the mobility of material during injection molded is low, so there is the problem needing high injection pressure such.
In addition, because be that the starting point manufactures with alkali-solubility, so there is the problem of the low grade of elevated temperature strength in current core.
In addition, in injection molding, after this shaping, in the core through oversintering, there is a lot of holes in its surface, therefore intensity is low, and Problems existing is in addition, and this hole likely becomes starting point, causes core to break when casting.
Therefore, the appearance of the hot investment casting core that elevated temperature strength improves is looked forward to.
Summary of the invention
The present invention is formed in view of the foregoing, its objective is, provides a kind of good fluidity, and the hot investment casting core that further increases of elevated temperature strength and manufacture method, hot investment casting mold.
For solving first invention of the present invention of above-mentioned problem, being a kind of hot investment casting core, it is characterized in that, siliceous particle and silica flour are carried out mixing and sinters, form hot investment casting core body and form.
Second invention is the hot investment casting core according to the first invention, it is characterized in that, forms coating form on the surface of the described hot investment casting core body through sintering.
3rd invention is a kind of hot investment casting mold of the manufacture for foundry goods, it is characterized in that, there is the hot investment casting core of the first or second invention of the shape corresponding with the hollow sectors of the inside of described foundry goods, and the outside mold corresponding with the shape of the outer peripheral face of described foundry goods.
4th invention is a kind of manufacture method of hot investment casting core, it is characterized in that, the sintering processes body of the hot investment casting core body being principal component with siliceous particle is immersed in the lining material comprising siliceous material and aluminum oxide material, then drying is carried out, thereafter heat-treat, form coating on the surface of hot investment casting core body.
5th invention is the manufacture method of the hot investment casting core according to the 4th invention, it is characterized in that, described siliceous material is Ludox, and described aluminum oxide material is alumina sol.
According to the present invention, in the siliceous particle that granularity is thick, add spherical ultramicronized silica flour, the mobility through the mixture of preparation improves.Thereby, it is possible to the reduction of injection molded pressure when realizing core production.
In addition, on the surface of the hot investment casting core body through sintering, form the coating of two kinds of different siliceous materials of particle diameter, shutoff has been carried out to the hole on the surface occurred during sintering, the intensity of core improves, and because hole sealed, can prevent core to break when casting such effect so serve.
Accompanying drawing explanation
Fig. 1 is the figure of the addition of the silica flour representing test example 2 and the relation of intensity.
Fig. 2 is the figure of the addition of the silica flour representing test example 3 and the relation of intensity.
Fig. 3 is the flow chart of an example of the operation representing casting method.
Fig. 4 is the flow chart of an example of the operation representing mold manufacture method.
Fig. 5 is the key diagram of the manufacturing process schematically showing core.
Fig. 6 is the stereogram of the part schematically showing mould.
Fig. 7 is the key diagram of the manufacturing process schematically showing wax-pattern.
Fig. 8 is the key diagram of the structure being shown schematically in coating sizing-agent on wax-pattern.
Fig. 9 is the key diagram of the manufacturing process schematically showing outside mold.
Figure 10 is the key diagram of a part of operation schematically showing mold manufacture method.
Figure 11 is the key diagram of a part of operation schematically showing casting method.
Figure 12 is the key diagram of the manufacturing process of the core schematically showing embodiment 2.
Figure 13 is the sectional structure chart of hot investment casting core.
Detailed description of the invention
Below, with reference to accompanying drawing, while be illustrated in detail for the present invention.Further, the present invention does not limit by the following description.In addition, in the inscape in the following description, also comprise the scope of that those skilled in the art can expect easily, identical in fact what is called equalization.
[embodiment 1]
Hot investment casting core of the present invention, is mixed siliceous particle and silica flour (particle diameter 0.15 μm) and is sintered, and forms hot investment casting core body and forms.
At this, siliceous particle, such as, by the fused silica (SiO of silica sand, silica flour etc.
2) formed.
This core body is manufactured by known method, as siliceous particle, use the monomer of silica sand (220 orders (20 ~ 70 μm) or 350 orders (20 ~ 40 μm)) or such as use silica China (such as 800 orders (10 ~ 20 μm)) and silica sand (such as 220 orders or the 350 orders) part by weight by 1: 1 to be mixed, wherein add silica flour (particle diameter 0.15 μm), and add wax wherein, carry out adding hot milling, obtain mixture.
At this, silica flour is preferably particle diameter 0.05 ~ 0.5 μm.
At this, concocting the silica flour in siliceous particle, as shown in test example described later, can be more than 5 % by weight, is preferably more than 10 % by weight, is more preferably more than 20 % by weight.This is because, lower than 5 % by weight interpolation, the intensity of core is improved and is not had help.
By injection molded, be shaped this mixture obtained and obtain core formed body.
Thereafter, such as, carry out the ungrease treatment by the end of 600 DEG C, then such as carry out the sintering processes at 1,200 DEG C, obtain core body.
By in the siliceous particle that granularity is thick, add spherical ultramicronized silica flour, the mobility through the mixture of preparation improves.Thereby, it is possible to the reduction of injection molded pressure when realizing core production.
< test example 1>
Test example for the effect of showing mobility of the present invention is described.
The mobility just achieving the mixture that injection moldability improves compares to be tested.
In siliceous particle (such as 220 orders), add wax (thermoplasticity) 10 % by weight, carry out mixing and make it Composite, it can be used as the mixture compared.
In siliceous particle (such as 220 orders), mix silica flour with weight ratio 9: 1, add the wax (thermoplasticity) of 10 % by weight, carry out mixing and make it Composite, it can be used as the mixture of this test.
Each mixture of existing (comparing product mixture) of not adding silica flour and (the trial target mixture) that be added with silica flour is put into injection molding machine, compares pressure when adding thermojet.
By only have siliceous particle existing compare product mixture be set to 100 time, the trial target mixture being added with silica flour 10 % by weight is 85, confirms resistance and diminishes, and silica flour adds the raising bringing mobility.
Its result is, in trial target mixture, because mobility improves, so the reduction of injection molded pressure when can realize core production.In addition, mobility raising can towards the application of thin molded article, complicated shape formed products.
< test example 2>
Test example for the effect of showing intensity of the present invention is described.
In this test example, in silica sand (220 orders: 20 ~ 70 μm), adding silica flour is respectively 10 % by weight, 20 % by weight, 30 % by weight, 40 % by weight, adds wax wherein, carries out adding hot milling, obtain trial target mixture.At this, silica sand uses Long Sen society system " RD-120 " (trade name).
The each trial target mixture using this to obtain, obtains formed body by injection molded.
As each evaluation test body, obtain the test body of wide by 30 × long 200 × thick 5mm.
Then, carry out the ungrease treatment by the end of 600 DEG C and 1, the sintering processes at 200 DEG C, obtain the evaluation test body of core body.
Measure the intensity of the evaluation test body that this obtains.
At this, strength test is carried out according to " bending strength (1981) of pottery " of JISR1601.
The result of the test display of test example 2 in FIG.Fig. 1 is the figure of the addition of the silica flour representing test example 2 and the relation of intensity.
As shown in Figure 1, along with the increase of silica flour addition, bending strength rises, and increases by the end of 20 % by weight.Further, in the interpolation more than 20 % by weight, the ratio that intensity improves is little.
Consequently, the silica flour of blending is particulate, if addition is too much, then densified aggravation, the alkali of core is dissolved with and may needs the time, therefore confirms, in order to improve the intensity of core, the addition of silica flour, is preferably the scope of 5 % by weight ~ 30 % by weight, the preferably scope of 10 % by weight ~ 30 % by weight.
So, in the siliceous particle that granularity is thick, by adding spherical ultramicronized silica flour, preparing mixture, can confirm the dense structure of core material, the raising of bending strength is played.
< test example 3>
Except making the particle of silica sand in test example 2 be except 350 orders (20 ~ 40 μm), all operating in the same manner as test example 2, carrying out bend test.
The result of the test display of test example 3 in fig. 2.Fig. 2 is the figure of the addition of the silica flour representing test example 3 and the relation of intensity.
As shown in Figure 2, because make silica sand more tiny than test example 2, the value of initial bending strength is high.In addition, along with the increase of silica flour addition, bending strength rises, and increases by the end of 20 % by weight.Further, in the interpolation more than 30 % by weight, the ratio that intensity improves is little.Can be confirmed by Fig. 2, in order to improve the intensity of core, the addition of silica flour is preferably the scope of 5 % by weight ~ 30 % by weight, preferably the scope of 10 % by weight ~ 30 % by weight.
Below, for using the casting method of being furnished with the mold of hot investment casting core of the present invention to be described.
Fig. 3 is the flow chart of an example of the operation representing casting method.Below, use Fig. 3, casting method is described.At this, the process shown in Fig. 3, can automatically carry out, and also can be that operator operates the device carrying out each operation and carries out.The casting method of present embodiment makes mold (step S1).Mold can make in advance, also can carry out casting at every turn and make.
Below, use Fig. 4 to Figure 10, for step S1 operation practiced by the mold manufacture method of present embodiment be described.Fig. 4 is the flow chart of an example of the operation representing mold manufacture method.At this, the process shown in Fig. 4, can automatically carry out, and also can be that operator operates the device carrying out each operation and carries out.
Mold manufacture method makes core (core) (step S12).Core is the shape corresponding with the cavity of the inside of the foundry goods made by mold.In other words, core is configured in the part corresponding with the cavity of the inside of foundry goods, suppresses the metal forming foundry goods during casting to flow into thus.Below, with Fig. 5, the manufacturing process of core is described.
Fig. 5 is the key diagram of the manufacturing process schematically showing core.In mold manufacture method, prepare mould 12 (step S101) as shown in Figure 5.The region that mould 12 is corresponding with core is cavity.Part as the cavity of core is protuberance 12a.Further, in Fig. 5, represent mould 12 with cross section, but mould 12 is except except the opening of space injection material and the hole of discharged air, is essentially the cavity of the complete cycle in the region covered corresponding to core.Mold casting method is as shown in arrow 14, is inside ceramic size 16 being injected into mould 12 from the opening of the space injection material to mould 12.Specifically, be that the so-called injection molded of inside by ceramic size 16 being ejected into mould 12 makes core 18.In mold manufacture method, if at the internal production core 18 of mould 12, then take out core 18 from mould 12, the core 18 of taking-up be arranged in firing furnace 20, make it to burn till.Thus, the core 18 formed by pottery bakes (step S102).
In mold manufacture method, after making core 18, carry out the making (step S14) of outer mold.Outer mold is the inner peripheral surface shape corresponding with the outer peripheral face of foundry goods.Mould can be formed by metal, also can be formed by pottery.Fig. 6 is the stereogram of the local schematically showing mould.In mould 22a shown in Fig. 6, the recess being formed at inner peripheral surface is corresponding with the outer peripheral face of foundry goods.Further, in figure 6, only display mould 22a, but also make corresponding with mould 22a, and be formed at mould corresponding with mould 22a on the direction of the recess of inner peripheral surface in blocking.In mold manufacture method, by making 2 moulds be combined, become the mould that inner peripheral surface is corresponding with the outer peripheral face of foundry goods.
In mold manufacture method, after having made outer mold, carry out the making (step S16) of wax-pattern (wax pattern).Below, be illustrated with Fig. 7.Fig. 7 is the key diagram of the manufacturing process schematically showing wax-pattern.Mold manufacture method arranges core 18 (step S110) in the assigned position of mould 22a.Then, the mould 22b corresponding with mould 22a is covered and is formed on the face of recess at mould 22a, surround core 18 around with mould 22a, 22b, form space 24 at core 18 and between mould 22a, 22b.In mold manufacture method, as shown in arrow 26, from the pipe arrangement being communicated in space 24 towards the injection (step S112) of WAX28 the inside in space 24.If WAX28 is heated to more than set temperature, the material that such melting temperature is lower can be melted, such as wax.Mold manufacture method is the whole area filling WAX28 (step S113) in space 24.Afterwards, WAX28 is solidified, thus form the wax-pattern 30 that WAX28 surrounds the surrounding of core 18.Wax-pattern 30 is essentially part that WAX28 the formed shape identical with the foundry goods of manufacturing purpose.Then, process for manufacturing cast article is separated from mould 22a, 22b by wax-pattern 30, installs cast gate 32 (step S114).As the dog-house of the liquation of motlten metal when cast gate 32 is castings.In mold manufacture method, being produced on inner containing core 18 as above, is the wax-pattern 30 formed with WAX28 of identical shape with foundry goods.
In mold manufacture method, after having made wax-pattern 30, carry out slurry coating (dip-coating) (step S18).Fig. 8 is the key diagram of the structure schematically shown to wax-pattern coating sizing-agent.Fig. 9 is the key diagram of the manufacturing process schematically showing outside mold.Mold manufacture method as shown in Figure 8, makes wax-pattern 30 be immersed in contain the reservoir 41 of slurry 40, carries out drying (step S19) after taking-up.Thereby, it is possible to form priming coat 101A on the surface of wax-pattern 30.
At this, the slurry be coated with in step S18 is the slurry directly coating wax-pattern 30.This slurry 40 uses and is singlely dispersed with the ultramicronized slurry of aluminium oxide.In this slurry 40, preferably use the particulate of the fire resistance about 350 orders as powder, such as zirconia.In addition, as dispersant, preferably use polycarboxylic acid.In addition, in slurry 40, preferably trace adds defoamer (material of silicon system), wettability improving agent, and such as 0.01%.By adding wettability improving agent, the tack of slurry 40 pairs of wax-patterns 30 can be made to improve.
Mold manufacture method as shown in Figure 8, carries out slurry coating with slurry 40, dry and on the wax-pattern with priming coat (the first desciccator diaphragm) 101A, then carries out slurry coating (dip-coating) (step S20).Then, as shown in Figure 9, on the surface of this moistening slurry, carry out sprinkling whitewashing (step S21) of zircon ash mud pellet (average grain diameter 0.8mm) as plaster material 54.The dry wax-pattern having plaster material 54 in the surface attachment of pulp layer afterwards, forms first and supports (backup) layer (the second desciccator diaphragm) 104-1 (step S22) on priming coat (the first desciccator diaphragm) 101A.
The judgement (step S23) of the operation carrying out making the formation process of this first supporting layer (the second desciccator diaphragm) 104-1 same repeatedly (such as n:6 ~ 10 time).Make the n-th supporting layer 104-n stacked (step S23:Yes) of stipulated number (n), obtain being formed Multi-layer supporting layer 105A, thickness such as 10mm outside mold be dried to body 106A.
In mold manufacture method, what obtain the multilayer being formed with priming coat 101A and Multi-layer supporting layer 105A is dried to body 106A, and this is dried to body 106A and heat-treats (step S24).Specifically, removing is in the WAX between outside mold and core, reburns into outside mold and core.Below, be described with Figure 10.Figure 10 is the key diagram of a part of operation schematically showing mold manufacture method.Mold manufacture method as shown in step S130, using be formed multiple layers of priming coat 101A and Multi-layer supporting layer 105A as outside mold be dried to the inside that body 106A puts into autoclave 60, heat.Autoclave 60 is full of inside with steam under pressure, and the wax-pattern 30 in heat drying formed body 106.Form the WAX fusing of wax-pattern 30 thus, melting WAX62 discharges from being dried to body space that 106A surrounds 64.
In mold manufacture method, by being discharged from space 64 by melting WAX62, as shown in step S131, be made into the mold 72 being formed with space 64 in the region being filled with WAX be dried between body 106A and core 18 as outside mold.Then, mold manufacture method, as shown in step S132, will be dried to as outside mold the mold 72 being formed with space 64 between body 106A and core 18, heats with firing furnace 70.Thus, be included in mold 72 as outside mold be dried to moisture in body 106A and unwanted composition is removed, in addition, being hardened through burning till, being formed outside mold 61.Process for manufacturing cast article makes mold 72 in the above-described manner.
With Fig. 3 and Figure 11, continue the explanation of casting method.Figure 11 is the key diagram of a part of operation schematically showing casting method.If casting method has made mold with step S1, then carry out the preheating (step S2) of mold.Such as, mold is configured in stove (vacuum drying oven, firing furnace), is heated to more than 800 DEG C and less than 900 DEG C.By carrying out preheating, when the manufacture of foundry goods, when can suppress liquation (molten metal) to be injected into mold, mold damages.
In casting method, after having carried out preheating to mold, carry out pouring into a mould (step S3).That is, as shown in the step S140 of Figure 11, by liquation 80, the raw material (such as steel) of the foundry goods namely melted is injected between outside mold 61 and core 18 from the opening of mold 72.
In casting method, after the liquation 80 of injection mold 72 is solidified, removing outside mold 61 (step S4).Namely, as shown in the step S141 of Figure 11, liquation mold 72 solidified inside and after becoming foundry goods 90, pulverize outside mold 61, and it can be used as fragment 61a to remove from foundry goods 90.
In casting method, eliminate after the mold 61 of outside from foundry goods 90, carry out off-type core process (step S5).Be exactly as shown in the step S142 of Figure 11, put into foundry goods 90 in the inside of autoclave 92, carry out the process of off-type core, the core 18 of the inside of fusing foundry goods 90, discharges the inside of the fusing core 94 melted from foundry goods 90.Specifically, in the inside of autoclave 92, foundry goods 90 dropped in aqueous slkali, repeatedly pressurize, reduce pressure, from foundry goods 90, discharge fusing core 94 thus.
In casting method, after having carried out the process of off-type core, carry out trimming process (step S6).Exactly trimming process is carried out for the surface of foundry goods 90 and inside.In addition, in casting method, together with processing with trimming, also carry out the finished product inspection of foundry goods.Thus, foundry goods 100 can be manufactured as shown in the step S143 of Figure 11.
In the casting method of present embodiment, use the lost wax process employing WAX (wax) to make mold as shown above, and make foundry goods.At this, the mold manufacture method of present embodiment, casting method and mold are used as the aluminium oxide ultra micron of slurry on the outside mold of the part in the outside as mold, form priming coat (the first desciccator diaphragm as the first floor) 101A forming inner peripheral surface, formed in the outside of this priming coat 101A multilayer supporting layer 105A and as sandwich construction.
As hot investment casting product of the present invention, except gas turbine movable vane, such as gas turbine stator blade, gas turbine burner, gas turbine segmentation ring etc. can also be enumerated.
[embodiment 2]
Secondly, the second hot investment casting core is described.Figure 13 is the sectional structure chart of hot investment casting core.
Hot investment casting core of the present invention is (hereinafter referred to as " core body " in the hot investment casting core body through oversintering being principal component with siliceous particle.) surface, the coating forming the different two kinds of siliceous materials of particle diameter forms.
Shown in the epimere of the profile of the core body of sintered body as shown in fig. 13 that, on the surperficial 18b of core body 18a, many hole 18c during sintering, can be there is.
In the present invention, as shown in the hypomere of Figure 13, be coated to the hole 18c being formed at this surperficial 18b with coating 19a, shutoff is carried out to hole 18c.
In the present embodiment, the siliceous particle and the silica flour that obtain in embodiment 1 (particle diameter 0.15 μm) mixed and sintered, being formed coating 19a at the surperficial 18b of the core body 18a of sintered body.
Coating 19a, as an example, uses two kinds of siliceous materials that particle diameter is different.
At this, the siliceous material that two kinds of particle diameters are different, as the first materials'use Ludox (SiO
2be 30 % by weight), as the second materials'use silica flour (particle diameter 0.15 μm).
In the present invention, dispersion silica flour is added for Ludox, prepares Ludox-silica flour slurry.
At this, Ludox and silica flour by weight proportion 1: 1 ~ 4: 1 ratio carry out mixing.The ratio of the silicon dioxide microparticle in Ludox when carrying out mixing with 2: 1 is that colloidal sol solid is divided: silica flour=30: 50.
Core body 18a in obtained Ludox-silica flour slurry after impregnation sintering, then mentions, and on the surface of core body 18a, forms the coating 19a be made up of Ludox-silica flour.When the formation of this coating 19a, also soak in the hole 18c on the surface of core and have paste composition, among the hole of core material, after drying, also can separate out the composition of Ludox-silica flour.
Carry out drying afterwards, then such as with 1, heat-treat for 000 DEG C.As long as this heat treatment can form coating 19a on surface, such as also can 1, less than 000 DEG C.
The coating 19a that this obtains is in the gap of the large silica flour of the particle diameter of the siliceous material as constituent material, and be filled with the state of the little Ludox of particle diameter, therefore filling is fine and closely woven, can form compacted zone.
In addition, because silica flour is spherical, so the little Ludox of particle diameter easily enters the interparticle gap of the large silica flour of particle diameter, therefore fine and closely woven filling improves further.In addition, the Ludox of particulate, makes interparticle adhesive force improve, and therefore contributes to intensity and improves.
So, according to the present invention, the elevated temperature strength of the core of hot investment casting improves.
In addition, as the second material forming coating, use siliceous material and aluminum oxide material.
At this, siliceous material is Ludox (SiO
2be 30 % by weight), aluminum oxide material is alumina sol (Al
2o
3).
Ludox (SiO
2) and alumina sol (Al
2o
3) mixing with mol ratio=2: the mode of 3 is concocted, and prepares mixed sols (silica-alumina colloidal sol).
Core test body is flooded in the silica-alumina colloidal sol prepared, then mention, at the surperficial 18b of core body 18a, form the layer of silica-alumina colloidal sol, and also have the one-tenth of silica-alumina colloidal sol to analyze at the hole 18c of whose surfaces.
Dry afterwards, then such as with 1, heat-treat for 000 DEG C.This heat treatment, as long as coating 19a can be formed on surface, such as also can 1, less than 000 DEG C.
In this heat treatment, silica-alumina colloidal sol becomes dystectic mullite (3Al by reacting
2o
32SiO
2).The core 18 that core body 18a is covered by this mullitized coating 19a can be obtained.
At this, the fusing point of mullite is 1,900 DEG C, more much higher than the fusing point (1,600 DEG C) of silica, therefore can tackle high cast temperature.
In addition, as the 3rd material forming coating, use alcohol salt material.
At this, alcohol salt material is the mixed alcoholate of independent silicon alkoxide or silicon alkoxide and aluminium-alcohol salt.
As silicon alkoxide, use silicon ethylate (ethyl orthosilicate, original text: シ リ コ Application エ ト キ シ De) or silicon butylate (butyl silicate, original text: シ リ コ Application Block ト キ シ De), use ethanol or butanols as solvent.
In addition, during mixing two kinds of alkoxide, as the mixed alcoholate material of silicon alkoxide and aluminium-alcohol salt, as its solvent, such as, the alcohol series solvent of butanols etc. is used.
During preparation mixed alcoholate, concoct the solution mixed alcoholate of silicon ethylate and aluminium isopropoxide being dissolved in butanols.
At this, mixed alcoholate (silicon ethylate+aluminium isopropoxide), with mol ratio=2: the mode of 3 is concocted, prepares organic mixed alcoholate.
In the alkoxide monomer prepared or mixed alcoholate, flood core test body, then mention, at the surperficial 18b of core body 18a, form the layer of silicon layer or silicon-aluminium-alcohol salt, and also have the one-tenth of silicon composition or silicon-aluminium-alcohol salt to analyze in the hole 18c of whose surfaces.
When this dipping, because be dissolved with alkoxide monomer or mixed alcoholate in alcoholic solution, so good to soaking into of core body, good coating can be formed.
Carry out drying afterwards, then heat-treat with such as 1,000 DEG C.As long as this heat treatment can form coating 19a on surface, such as also can 1, less than 000 DEG C.
In this heat treatment, when mixed alcoholate, the layer of silicon-aluminium-alcohol salt becomes the mullite (3Al of dystectic inorganic body by reacting
2o
32SiO
2).The core 18 that core body 18a is covered by this mullitized coating 19a can be obtained.
At this, the fusing point of mullite is 1,900 DEG C, more much higher than the fusing point (1,600 DEG C) of silica, therefore can corresponding high cast temperature.
In addition, as the 4th material forming coating, the alkoxide-silica flour material be made up of alcohol salt material and silica flour is used.
At this, alcohol salt material is the mixed alcoholate of independent silicon alkoxide or this silicon alkoxide and aluminium-alcohol salt.
The silica flour of inorganic material, such as, use the orbicule of particle diameter 0.15 μm.
At this, silica flour preferable particle size is the silica flour of 0.05 ~ 0.5 μm.
Dispersion ratio as silica flour is 5 ~ 40 % by weight, is preferably about 20 % by weight.
As silicon alkoxide, use silicon ethylate or silicon butylate, as solvent, use ethanol or butanols.
In addition, when mixing two kinds of alkoxide, be the mixed alcoholate material of silicon alkoxide and aluminium-alcohol salt, as its solvent, such as, use the alcohol series solvent of butanols etc.
Preparation mixed alcoholate, concocts the solution mixed alcoholate of silicon ethylate and aluminium isopropoxide be dissolved in butanols.
At this, mixed alcoholate (silicon ethylate+aluminium isopropoxide), with mol ratio=2: the mode of 3 is concocted, prepares organic mixed alcoholate.
Core test body is flooded in the monomer alkoxide being dispersed with silica flour prepared or mixed alcoholate, then mention, at the surperficial 18b of core body 18a, formed containing the silicon layer of silica flour or the layer of silicon-aluminium-alcohol salt, and also have the one-tenth of the silicon layer of silicon powder-containing or silicon-aluminium-alcohol salt to analyze at the hole 18c of whose surfaces.
When this dipping, because be dissolved with alkoxide monomer or mixed alcoholate in alcoholic solution, so good to soaking into of core body, good coating can be formed.
Carry out drying afterwards, then such as with 1, heat-treat for 000 DEG C.As long as this heat treatment can form coating 19a on surface, such as also can 1, less than 000 DEG C.
After this drying, become among the hole 18c of the surperficial 18b of core body 18a, also have the form becoming to analyze of alkoxide and silica flour.At this moment, the silicon powder layer of Large stone and fine and mixed layer that the is alcohol salt deposit of densification can be formed.
Then, by 1, the heat treatment at 000 DEG C, there is inorganic ceramic in alcohol salt deposit, fills up the space of the silicon powder layer of Large stone with the ceramic layer of densification, and interparticle adhesive force can be made to improve.
In this heat treatment, when using mixed alcoholate, the layer of the silicon-aluminium-alcohol salt of silicon powder-containing, becomes the mullite (3Al of dystectic inorganic body by reacting
2o
32SiO
2).Can obtain the core 18 that core body 18a is covered by coating 19a, and this coating 19a is the space having filled up the silicon powder layer of Large stone with the mullite layer of densification, improves interparticle adhesive force coating.
At this, the fusing point of mullite is 1,900 DEG C, more much higher than the fusing point (1,600 DEG C) of silica, therefore can tackle high cast temperature.
So, according to the present invention, because a large amount of hole formed, surface is by shutoff, thus when can prevent from casting core as before with this hole for starting point is broken.Therefore, the elevated temperature strength of the core of hot investment casting improves.
In addition, because its particle diameter of silica flour is large, even if so 1, under the heat treatment at 000 DEG C, thermal contraction is also little.
In addition, as forming the 5th material of coating, use siliceous material and aluminum oxide material and silica flour.
At this, siliceous material is Ludox (SiO
2be 30 % by weight), aluminum oxide material is alumina sol (Al
2o
3).
At this, the dispersion ratio as the silica flour be dispersed in siliceous material and aluminum oxide material is 5 ~ 40 % by weight, is preferably about 20 % by weight.
Silica flour preferable particle size is the silica flour of 0.05 ~ 0.5 μm.
At this, Ludox (SiO
2) and alumina sol (Al
2o
3) mixing, with mol ratio=2: the mode of 3 is concocted, prepare mixed sols (silica-alumina colloidal sol) (particle diameter of dispersed particle: 1 ~ number 100nm).
In the silica-alumina colloidal sol prepared, add dispersion silica flour, prepare silica one alumina sol-silica flour slurry.
In silica-alumina colloidal sol-silica flour slurry that this prepares, dipping core test body, mention afterwards, at the surperficial 18b of core body 18a, form the layer of silica-alumina colloidal sol-silica flour, and in the hole 18c of whose surfaces, also have the one-tenth of silica-alumina colloidal sol-silica flour to analyze.
Carry out drying afterwards, then such as with 1, heat-treat for 000 DEG C.As long as this heat treatment can form coating 19a on surface, such as also can 1, less than 000 DEG C.
In this heat treatment, silica-alumina colloidal sol, becomes dystectic mullite (3Al by reacting
2o
32SiO
2).Can obtain the core 18 that core body 18a is covered by coating 19a, and this coating 19a is the space having filled up the silicon powder layer of Large stone with the mullite layer of densification, improves the coating of interparticle adhesive force.
At this, the fusing point of mullite is 1,900 DEG C, more much higher than the fusing point (1,600 DEG C) of silica, therefore can to the high cast temperature of point.
So, according to the present invention, because a large amount of hole formed, surface is by shutoff, thus when can prevent from casting core as before with this hole for starting point is broken.Therefore, the elevated temperature strength of the core of hot investment casting improves.
In addition, because its particle diameter of silica flour is large, even if so 1, in the heat treatment at 000 DEG C, thermal contraction is also little.
< test example 4>
Below, the test example confirming effect of the present invention is described.
In this test example, in silica sand (220 order), add silica flour 20 % by weight, add wax wherein, add hot milling, obtain mixture.
Injection molded is carried out for this mixture obtained and obtains formed body.
As evaluation test body, obtain the test body of wide by 30 × long 200 × thick 5mm.
Then, carry out the ungrease treatment by the end of 600 DEG C and 1, the sintering processes at 200 DEG C, obtain the test body of core body.
Then, for Ludox (SiO
2be 30 % by weight), add dispersion silica flour (particle diameter is 0.15 μm, spherical), prepare Ludox-silica flour slurry (Ludox and silica flour by weight proportion carry out at 2: 1 mixing).At this moment, the ratio of the silicon dioxide microparticle in Ludox is that colloidal sol solid is divided: silica flour=30: 50.
In this Ludox obtained-silica flour slurry, the test body of dipping core body, mentions afterwards, forms the coating 19a of Ludox-silica flour on surface.Then after drying, with 1, heat-treat for 000 DEG C, form at the surperficial 18b of core body 18a the coating 19a be made up of Ludox-silica flour.
As comparative example, using do not formed coating as comparative test body.
Measure the intensity of these evaluation test bodies.
At this, strength test is carried out according to " bending strength (1981) of pottery " of JISR1601.
The intensity not forming the comparative test body of coating of existing method is 23MPa, in contrast, the intensity of the test body of the core body of method of the present invention is 29MPa.Its result can confirm, the test body intensity of core body of the present invention improves 25%.
Below, the casting method employing the mold being furnished with hot investment casting core of the present invention is described.
Further, omit the operation identical with the casting method of embodiment 1, only " operation of the manufacture of core " is described with reference to Figure 12.
Figure 12 is the key diagram of the manufacturing process of the core schematically showing embodiment 2.In mold manufacture method, prepare mould 12 (step S101) so as shown in figure 12.Its region corresponding with core of mould 12 is cavity.Part as the cavity of core is protuberance 12a.Further, in fig. 12, mould 12 is represented with cross section, but mould 12, except except the opening of space injection material and the hole of discharged air, be essentially the cavity of the complete cycle in the region covered corresponding to core.Mold casting method is as shown in arrow 14, is inside ceramic size 16 being injected into mould 12 from the opening of the space injection material to mould 12.Specifically, be that the so-called injection molded of inside by ceramic size 16 being ejected into mould 12 makes core 18.In mold manufacture method, if at the internal production core 18 of mould 12, then take out core 18 from mould 12, the core 18 of taking-up be arranged in firing furnace 20, make it to burn till.Thus, the core 18 formed by pottery bakes (step S102).
Hereto all same with the operation of embodiment 1.
Then, as shown in figure 12, in order to form coating on the surface of core 18, the core 18 through sintering being immersed in and containing in the reservoir 17 of slurry 19, after taking-up, carrying out drying (step S103).Secondly, take out the core 18 of dipping, be arranged in firing furnace 20 and make it to burn till.Thus, the surface being formed in the core 18 that pottery is formed forms coating 19a (step S104).
In mold casting method, make the core 18 by forming coating 19a as upper type.Further, core 18 is formed by the material removed with the off-type core process of chemical treatment etc. after casting solidification.
In the casting method of present embodiment, because form coating on the surface of core, so dimensional accuracy improves, even if cast temperature is high temperature, durability also increases.
In addition, even if when the casting cycle time is long-time, because be the core of high strength, so the free degree of casting design (such as slowing down sets very low) still improves.
In addition, the thin-walled property of goods can be realized, manufacture the hot investment casting product of the good turbine rotor blade of the thermal efficiency etc.
[explanation of symbol]
12,22a, 22b mould
12a protuberance
14,26 arrows
16 ceramic sizes
18 cores (core)
18a core body
18b surface
18c hole
19 slurries
19a coating
20,70 firing furnaces
24,64 spaces
28WAX (wax)
30 wax-patterns
32 cast gates
40 slurries
60,92 autoclaves
Mold outside 61
61a fragment
62 melting WAX
72 molds
80 liquations
90,100 foundry goods
94 fusing cores
101A priming coat
Claims (5)
1. a hot investment casting core, is characterized in that, mixes siliceous particle and silica flour and sinters, and forms hot investment casting core body and forms.
2. hot investment casting core according to claim 1, is characterized in that, forms coating form on the surface of the described hot investment casting core body through sintering.
3. a hot investment casting mold, is characterized in that, is the hot investment casting mold of the manufacture for foundry goods, has:
Hot investment casting core described in the claim 1 or 2 of the shape corresponding with the hollow sectors of the inside of described foundry goods; With
The outside mold corresponding with the shape of the outer peripheral face of described foundry goods.
4. a manufacture method for hot investment casting core, is characterized in that,
The sintering processes body of the hot investment casting core body being principal component with siliceous particle is immersed in the lining material comprising siliceous material and aluminum oxide material, then drying is carried out, thereafter implement heat treatment, form coating on the surface of hot investment casting core body.
5. the manufacture method of hot investment casting core according to claim 4, is characterized in that, described siliceous material is Ludox, and described aluminum oxide material is alumina sol.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-113131 | 2013-05-29 | ||
| JP2013113131A JP2014231080A (en) | 2013-05-29 | 2013-05-29 | Core for precision casting, production method therefor, and mold for precision casting |
| PCT/JP2014/064166 WO2014192825A1 (en) | 2013-05-29 | 2014-05-28 | Core for precision casting, production method therefor, and mold for precision casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105283258A true CN105283258A (en) | 2016-01-27 |
| CN105283258B CN105283258B (en) | 2018-02-16 |
Family
ID=51988848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480029889.4A Expired - Fee Related CN105283258B (en) | 2013-05-29 | 2014-05-28 | Hot investment casting is with core and its manufacture method, hot investment casting mold |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20160114384A1 (en) |
| JP (1) | JP2014231080A (en) |
| KR (1) | KR101761046B1 (en) |
| CN (1) | CN105283258B (en) |
| DE (1) | DE112014002622T5 (en) |
| WO (1) | WO2014192825A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106862480A (en) * | 2017-01-23 | 2017-06-20 | 中国第汽车股份有限公司 | A kind of high mode inorganic binder |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6374752B2 (en) * | 2014-10-08 | 2018-08-15 | 株式会社ノリタケカンパニーリミテド | Refractory and its manufacturing method |
| WO2017135150A1 (en) * | 2016-02-02 | 2017-08-10 | 株式会社神戸製鋼所 | Evaporative pattern casting method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87105530A (en) * | 1986-08-14 | 1988-04-13 | 佐佐木信义 | Core for investment casting, method of manufacturing the same, and method of manufacturing investment casting mold containing the core therein |
| JPH0747444A (en) * | 1993-08-05 | 1995-02-21 | Mitsubishi Heavy Ind Ltd | Manufacture of casting mold for precise casting |
| JPH0748170A (en) * | 1991-05-21 | 1995-02-21 | Satoyuki Inui | Production of high-purity mullite |
| JP2003170245A (en) * | 2001-12-07 | 2003-06-17 | Mitsubishi Heavy Ind Ltd | Method for coating core material and manufacturing method for hollow structure |
| JP2004528988A (en) * | 2001-06-07 | 2004-09-24 | オンデオ ナルコ カンパニー | Manufacturing method of precision casting shell |
| CN1607051A (en) * | 2003-10-15 | 2005-04-20 | 联合工艺公司 | Refractory metal core coating |
| CN1772419A (en) * | 2004-11-09 | 2006-05-17 | 朱晓林 | Soluble ceramic core for metal casting |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08340467A (en) | 1995-06-14 | 1996-12-24 | Canon Inc | Image input device |
-
2013
- 2013-05-29 JP JP2013113131A patent/JP2014231080A/en active Pending
-
2014
- 2014-05-28 US US14/893,962 patent/US20160114384A1/en not_active Abandoned
- 2014-05-28 WO PCT/JP2014/064166 patent/WO2014192825A1/en active Application Filing
- 2014-05-28 CN CN201480029889.4A patent/CN105283258B/en not_active Expired - Fee Related
- 2014-05-28 KR KR1020157033494A patent/KR101761046B1/en active IP Right Grant
- 2014-05-28 DE DE112014002622.0T patent/DE112014002622T5/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87105530A (en) * | 1986-08-14 | 1988-04-13 | 佐佐木信义 | Core for investment casting, method of manufacturing the same, and method of manufacturing investment casting mold containing the core therein |
| JPH0748170A (en) * | 1991-05-21 | 1995-02-21 | Satoyuki Inui | Production of high-purity mullite |
| JPH0747444A (en) * | 1993-08-05 | 1995-02-21 | Mitsubishi Heavy Ind Ltd | Manufacture of casting mold for precise casting |
| JP2004528988A (en) * | 2001-06-07 | 2004-09-24 | オンデオ ナルコ カンパニー | Manufacturing method of precision casting shell |
| JP2003170245A (en) * | 2001-12-07 | 2003-06-17 | Mitsubishi Heavy Ind Ltd | Method for coating core material and manufacturing method for hollow structure |
| CN1607051A (en) * | 2003-10-15 | 2005-04-20 | 联合工艺公司 | Refractory metal core coating |
| CN1772419A (en) * | 2004-11-09 | 2006-05-17 | 朱晓林 | Soluble ceramic core for metal casting |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106862480A (en) * | 2017-01-23 | 2017-06-20 | 中国第汽车股份有限公司 | A kind of high mode inorganic binder |
| CN106862480B (en) * | 2017-01-23 | 2019-03-12 | 中国第一汽车股份有限公司 | A kind of high mode inorganic binder |
Also Published As
| Publication number | Publication date |
|---|---|
| US20160114384A1 (en) | 2016-04-28 |
| KR101761046B1 (en) | 2017-07-24 |
| KR20160003764A (en) | 2016-01-11 |
| JP2014231080A (en) | 2014-12-11 |
| WO2014192825A1 (en) | 2014-12-04 |
| DE112014002622T5 (en) | 2016-03-03 |
| CN105283258B (en) | 2018-02-16 |
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