CN106424583A - Water-soluble core based on near-closed inner cavity and preparation method of water-solute core based on near-closed inner cavity - Google Patents

Water-soluble core based on near-closed inner cavity and preparation method of water-solute core based on near-closed inner cavity Download PDF

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Publication number
CN106424583A
CN106424583A CN201611099854.5A CN201611099854A CN106424583A CN 106424583 A CN106424583 A CN 106424583A CN 201611099854 A CN201611099854 A CN 201611099854A CN 106424583 A CN106424583 A CN 106424583A
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China
Prior art keywords
core
water
baking
edible salt
inner chamber
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CN201611099854.5A
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Inventor
张泽春
罗辉
张晏
宋海峰
罗光
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Jianglu Machinery and Electronics Group Co Ltd
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Jianglu Machinery and Electronics Group Co Ltd
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Priority to CN201611099854.5A priority Critical patent/CN106424583A/en
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    • 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
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Mold Materials And Core Materials (AREA)

Abstract

The invention provides a water-soluble core based on a near-closed inner cavity and a preparation method of the water-soluble core based on the near-closed inner cavity. According to the technical scheme of a core preparation process, salt, refractory aggregate, a binder and a plasticizer which are high in solubility, wet strength and moisture resistance are adopted and form a mixture, the solubility of the core is improved through the salt with the high mass fraction, silica sol is adopted as the binder, CO2 is blown for hardening, and the taken core with the higher initial strength is formed; polyethylene glycol is added for improving the moisture resistance of the core, and then core box preparation, raw material pretreatment, mixture preparation through mixing and tamping and core forming are conducted; then the traditional problems that it is difficult to clear all the wet refractory aggregate in the inner cavity of the near-closed core of a large metal component out of the cavity and formation is difficult in near-closed inner cavity sand casting are solved; quick formation of the large metal component, especially the near-closed inner cavity core of the large aluminum alloy metal component is achieved; the method is widely used for the formation of the complex inner cavity of an investment casting; and the method is especially suitable for the core of the near-closed inner cavity of the large aluminum alloy component and manufacturing of the core.

Description

A kind of water-soluble core based on nearly closing inner chamber and preparation method thereof
Technical field
The present invention relates to a kind of water-soluble core based on nearly closing inner chamber and preparation method thereof.
Background technology
In existing large aluminum alloy component, because of the inner chambers that there are some nearly closings, cause product they or by adjacent Another inner chamber and communicate with component outer wall/inwall indirectly, and also little with the connected component of adjacent inner chamber；They or different Property, change in curved shape and on section in space very big.If with the inner chamber of this nearly closing of normal sands core moulding, being cannot Core sand is cleared, the inner chamber of this nearly closing will be formed, unique method is to use water-soluble core；This water solublity Core mixture and its core-making method are used for being formed the small-sized inner chamber of complexity of investment-casting and are widely used, but do not apply to Nearly closing inner chamber in molding large aluminum alloy component；First, in this compound the mass fraction of water soluble salt less ( Less than 10%), core is only understood defeated and dispersed in water and can not be completely dissolved, and when clearing up core with water, compound will not be discharged with current Outside chamber, the refractory aggregate in bulky foundry goods in hygrometric state is all cleared out outside chamber, difficulty is still very big；Second, it is only Binding agent is made with water soluble salt, the core strength that produces is not high, particularly core wet strength is very low, to producing big and complexity There is coring damage, core problem of Cracking in core, success rate is very low；Third, this compound has stronger hygroscopicity, no Suitable sand casting operating mode.In a word, the defect that prior art is present：A) core dissolution is poor；B) core strength is relatively low, coring Fragile, success rate is low；C) core hygroscopicity is stronger, and core is used for needing to carry out surface Hardening Treatment, surface peening when producing Complex treatment process, the cycle is long, high energy consumption.
Content of the invention
For above-mentioned situation, it is an object of the invention to provide a kind of water-soluble core based on nearly closing inner chamber, it adopts Constitute compound with all higher raw material of dissolubility, wet strength and resistance to water soak, make product both have higher qualification rate, The rigidity of product and intensity can be made again to be significantly improved；Its raw material easily takes, low production cost, applied range, easily industry Metaplasia is produced, and is easy to penetration and promotion, and commercial promise is wide.
A further object of the present invention is to provide a kind of preparation method of the water-soluble core based on nearly closing inner chamber, selects The raw material composition compound such as water soluble salt, refractory aggregate, binding agent and plasticizer, then through core box preparation, pre-treatment of raw material, It is blended compound, tamping shaping coremaking work step to make；Not only process is simple but also low cost, moreover it is possible to effectively solving large aluminum alloy component A shaping difficult problem for nearly closing inner chamber.
To achieve these goals, a kind of water-soluble core based on nearly closing inner chamber, by raw material water soluble salt, fire resisting Aggregate, binding agent and plasticizer composition compound, then through core box preparations, pre-treatment of raw material, be blended compound, tamping shaping make Core work step makes；The mass percent of the compound is：Edible salt 60%～80%, bauxite 2%～32%, Ludox 5%～10% and Aqueous Solutions of Polyethylene Glycol 3%～8%.
In order to realize structure, effect optimization, its further step is：
The mass percent of the compound is：Edible salt 80%, bauxite 2%, Ludox 5.0% and Polyethylene Glycol water Solution 3.0%.
The mass percent of the compound is：Edible salt 70%, bauxite 17%, Ludox 7.5% and Polyethylene Glycol Aqueous solution 5.5%.
The raw material Aqueous Solutions of Polyethylene Glycol be from the Aqueous Solutions of Polyethylene Glycol that concentration is 50%.
The tamping shaping coremaking work step includes：Wet core molding, core baking, three steps of core cover.
In order to realize an above-mentioned further object, a kind of preparation method of the water-soluble core based on nearly closing inner chamber, core system The operating process of work：
(i), core box prepares
A) core box is manufactured using aluminum alloy materials, carries out PROCESS FOR TREATMENT to the poor position of Packing character；
B) core box working surface will one layer of releasing agent of brush；
C) when ambient temperature is less than 15 DEG C, mould to be preheated before coremaking, 60～80 DEG C of preheating temperature, during preheating Between 15～20min；
(ii), pre-treatment of raw material
A) edible salt roasting：
In order to improve the thermal expansivity of compound, ftracture when avoiding core from being heated:
1. in advance by edible salt roasting, 600 DEG C～700 DEG C of sintering temperature, temperature retention time 3h～4h, treat after being cooled to room temperature With；
B) edible salt granularity joins level
In order to the Packing character of compound is improved, and reduce salt grain space in core, edible salt granularity need to be carried out and join level；
1. join that to take the undressed edible salt of certain amount stand-by, edible salt granularity be；
2. join the edible salt for taking the fired process of certain amount, in pulverizer, powdering is rolled over, granularity is 70～140 mesh；
3. undressed edible salt is carried out ratio with the edible salt of roasting spreading to mix；
C) Aqueous Solutions of Polyethylene Glycol is prepared
1. water is 1: 1 with the configuration proportion of Polyethylene Glycol, adds 1 Polyethylene Glycol, use in 1 water until completely dissolved In being blended compound；
(iii), compound is blended
A) by proportioning, various raw materials have been weighed；
B) first edible salt and bauxite being added and roll in edge runner mill, the time is rolled for 4min～6min；
C) add Ludox and Aqueous Solutions of Polyethylene Glycol rolls 5min～8min；
D) compound being blended is stored in the charging basket for drying sealing, stand-by；
(iv), tamping shaping coremaking
A) wet core molding；
1. first the craft fluffing of moulding sand processes compound；
2. the compound after processing is added in core box；
3. consolidate in charging；
4. after-blow CO is consolidated2Hardening, wet core makes molding；
B) core baking
1. core box is together put in baking oven together with wet core and heats；
2. it is 25～35min 80～90 DEG C, heat time heating time that heating-up temperature is；
3. optimal heats：It is preferred that optimum heating temperature, heat time heating time；
4. coring is carried out by when core box is cooled to room temperature；
5. the core for taking out is placed again into baking in baking oven；
6. baking temperature is 60～160 DEG C, and baking time is 5～7h；
7. optimal cured effect：It is preferred that optimal baking temperature, baking time；
C) core cover
1. core, brush coating number layer are repaired；
2. core, preferably brush coating coating are repaired；
3. the core after brush coating is put into baking in baking oven, and arranges moisture absorption class medium in drying on plate；
4. baking temperature is 110～120 DEG C, and baking time is 5～7h；
5. optimal cured effect：It is preferred that optimal baking temperature, baking time；
6. above-mentioned making finished product/core, is stored in calorstat, 40～45 DEG C of temperature；
When 7. playing core to use, take out from calorstat.
In order to realize structure, effect optimization, its further step is：
A kind of preparation method of the water-soluble core based on nearly closing inner chamber, a) step in operating process core box preparation (i) Suddenly：PROCESS FOR TREATMENT to the poor position of Packing character：Packed art hole is set.
A kind of preparation method of the water-soluble core based on nearly closing inner chamber, in operating process pre-treatment of raw material (ii) B) step：Undressed edible salt is 2: 1 with the mixed proportion of the edible salt of roasting spreading.
A kind of preparation method of the water-soluble core based on nearly closing inner chamber, in operating process tamping shaping coremaking (iv) C) step：Finishing core, preferably 3 layers～4 layers of brush coating coating.
A kind of preparation method of the water-soluble core based on nearly closing inner chamber, in operating process tamping shaping coremaking (iv) C) step：The moisture absorption class medium for arranging on plate of drying of baking oven is active paper.
A kind of water-soluble core based on nearly closing inner chamber and preparation method thereof, using dissolubility, wet strength and anti-suction Moist all higher salt, refractory aggregate, binding agent and plasticizer composition compound, improve the dissolving of core with high-quality fraction salt Property, CO is blown as binding agent with Ludox2Hardening so as to form the higher initial strength of coring, adds Polyethylene Glycol to improve core Resistance to water soak, then prepare through core box, pre-treatment of raw material, be blended compound, core production's technique such as tamping shaping coremaking Technical scheme；Refractory aggregate in the core inner chamber of the nearly closing for solving and having captured band large-scale metal component in hygrometric state is difficult to all Clear out the conventional difficulties with nearly closing inner chamber sand casting hardly possible molding outside chamber；Achieve band large-scale metal component, particularly Large size Aluminium The quick shaping of the nearly closing inner chamber core of alloy metal piece, and the product quality through its core casting is excellent, low cost, qualification rate High, with short production cycle, it is easy to penetration and promotion.
Beneficial effects of the present invention：
(1) a kind of water-soluble core based on nearly closing inner chamber of the present invention and preparation method thereof, using high-quality fraction Water solublity edible salt is major ingredient, and the core strength of making and core wet strength are all very high, particularly make big and complexity Core quality is significantly improved, and core does not ftracture, and coring is not damaged, success rate height；Band large-scale metal component is achieved, especially It is quick shaping and the preparation of the nearly closing inner chamber core of large aluminum alloy hardware.
(2) a kind of water-soluble core based on nearly closing inner chamber of the present invention and preparation method thereof, is adopted and is glued with Ludox CO is blown in knot agent2Hardening, is easy to the quick core for forming higher initial strength and facilitates coring, makes depoling become easy, quick.
(3) a kind of water-soluble core based on nearly closing inner chamber of the present invention and preparation method thereof, using being included in component Configuration Ludox and 50% Aqueous Solutions of Polyethylene Glycol, make core wet strength height, resistance to water soak good, suitable sand casting；Realize Nearly closing inner chamber sand mold high-speed casting.
(4) a kind of water-soluble core based on nearly closing inner chamber of the present invention and preparation method thereof, hygroscopic using not having Compound, has captured the conventional difficulties of nearly closing inner chamber sand casting hardly possible molding.
(5) a kind of water-soluble core based on nearly closing inner chamber of the present invention and preparation method thereof, using tamping three works of shaping The making of step core manufacturing craft, operating process, improve dissolubility, wet strength and the resistance to water soak of compound.
(6) a kind of water-soluble core based on nearly closing inner chamber of the present invention and preparation method thereof, is used in component and contains The edible salt of high-quality fraction, core dissolution is good, it is adaptable to the nearly closing inner chamber of molding large aluminum alloy component；Its technique letter Single, easy to operate, core qualification rate height；Its raw material easily takes, and low production cost is with short production cycle, applied range, easily industry Metaplasia is produced, and is easy to penetration and promotion, and commercial promise is wide.
A kind of water-soluble core based on nearly closing inner chamber of the present invention and preparation method thereof, it is widely used in forming fusible pattern The complicated inner cavity of foundry goods；Band large-scale metal component is particularly well-suited to, e.g., the core of the nearly closing inner chamber of molding large aluminum alloy component And its manufacture.
With reference to the accompanying drawings and examples the present invention is described in further detail.
Description of the drawings
Fig. 1 is the process chart of the present invention.
Specific embodiment
Shown in accompanying drawing, the comprehensive technical measure of the present invention and structural principle：A kind of water solublity based on nearly closing inner chamber Core, raw materials are made up of water soluble salt, refractory aggregate, binding agent and plasticizer, the percent mass of raw materials Than for edible salt 60%～80%, bauxite 2%～32%, Ludox 5%～10% and Aqueous Solutions of Polyethylene Glycol 3%～8%, Raw material is made compound, then is prepared through 1. core box, 2. pre-treatment of raw material, is 3. blended compound, 4. tamping shaping coremaking Deng concrete operations flow process, quick shaping and the preparation of the nearly closing inner chamber core of large aluminum alloy component is realized；The present invention's is main Structural principle is the allocation ratio for changing traditional raw materials, water soluble salt is brought up to higher configured by relatively low configuration, is reached To the dissolubility, wet strength and the resistance to water soak that improve compound；Make the nearly closing inner chamber in band large-scale metal foundry goods in hygrometric state resistance to Fiery aggregate all quickly can be cleared out outside chamber；Innovate a kind of water-soluble core based on nearly closing inner chamber and prepare the water solublity type The method of core.
In conjunction with accompanying drawing, a kind of preparation method of the water-soluble core based on nearly closing inner chamber, 1. core box prepare, 2. raw material Pretreatment, is 3. blended compound, 4. the operating process of the core production such as tamping shaping coremaking：
(i), core box prepares
A) core box is manufactured using aluminum alloy materials, is carried out PROCESS FOR TREATMENT to the poor position of Packing character, and is arranged packed art Hole；
B) core box working surface will one layer of releasing agent of brush；
C) when ambient temperature is less than 15 DEG C, mould to be preheated before coremaking, 60～80 DEG C of preheating temperature, during preheating Between 15～20min；
D) optimal pre-heat effect；It is preferred that 80 DEG C of preheating temperature, preheating time 20min；
(ii), pre-treatment of raw material
A) edible salt roasting：
In order to improve the thermal expansivity of compound, ftracture when avoiding core from being heated:
1. in advance by edible salt roasting, 600 DEG C～700 DEG C of sintering temperature, temperature retention time 3h～4h, treat after being cooled to room temperature With；
B) edible salt granularity joins level
In order to the Packing character of compound is improved, and reduce salt grain space in core, edible salt granularity need to be carried out and join level；
1. join that to take the undressed edible salt of certain amount stand-by, edible salt granularity be；
2. join the edible salt for taking the fired process of certain amount, in pulverizer, powdering is rolled over, granularity is 70～140 mesh；
3. undressed edible salt is carried out ratio with the edible salt of roasting spreading to mix；
C) Aqueous Solutions of Polyethylene Glycol is prepared
1. water is 1: 1 with the configuration proportion of Polyethylene Glycol, adds 1 Polyethylene Glycol, use in 1 water until completely dissolved In being blended compound；
(iii), compound is blended
A) by proportioning, various raw materials have been weighed；
B) first edible salt and bauxite being added and roll in edge runner mill, the time is rolled for 4min～6min；
C) add Ludox and Aqueous Solutions of Polyethylene Glycol rolls 5min～8min；
D) compound being blended is stored in the charging basket for drying sealing, stand-by；
(iv), tamping shaping coremaking
A) wet core molding；
1. first the craft fluffing of moulding sand processes compound；
2. the compound after processing is added in core box；
3. consolidate in charging；
4. after-blow CO is consolidated2Hardening, wet core makes molding；
B) core baking
1. core box is together put in baking oven together with wet core and heats；
2. it is 25～35min 80～90 DEG C, heat time heating time that heating-up temperature is；
3. optimal heats：It is preferred that 80 DEG C of optimum heating temperature, heat time heating time 30min；
4. coring is carried out by when core box is cooled to room temperature；
5. the core for taking out is placed again into baking in baking oven；
6. baking temperature is 60～160 DEG C, and baking time is 5～7h；
7. optimal cured effect：It is preferred that it is 5h that optimal baking temperature is 110 DEG C, baking time；
C) core cover
1. core, brush coating number layer are repaired；
2. core, preferably 3 layers～4 layers of brush coating coating are repaired；
3. the core after brush coating is put into baking in baking oven, and arranges moisture absorption stationery moisture absorption Jie on the drying plate of baking oven Matter；
4. baking temperature is 110～120 DEG C, and baking time is 5～7h；
5. optimal cured effect：It is preferred that optimal 110 DEG C of baking temperature, baking time 5h；
6. above-mentioned making finished product/core, is stored in calorstat, 40～45 DEG C of temperature；
When 7. playing core to use, take out from calorstat.
In conjunction with figure/table, to realizing technical measures and the feature of the present invention, reached purpose and effect, make further detailed Description.
Mix material proportioning embodiment
Mix material proportioning is researched and developed using orthogonal experiment, compound is by bauxite, edible salt, Ludox, 50% Polyethylene Glycol Aqueous solution constitutes.
Three factors：Edible salt, Ludox, 50% Aqueous Solutions of Polyethylene Glycol.
Each factor takes three levels
Edible salt (A factor)：80%th, 70%, 60%；
Ludox (B factor)：5.0%th, 7.5%, 10.0%；
50% Aqueous Solutions of Polyethylene Glycol (C factor)：3.0%th, 5.5%, 8.0%；
Bauxite mass percent=100%- edible salt mass percent-Ludox mass percent-Polyethylene Glycol Aqueous solution percent.
Experiment condition is shown in Table 1.
1 factor level table of table
Experimental index is sample dissolution time and sample tensile strength, and experimental result is shown in Table 2.
2 orthogonal table L of table9(34)
From table 2 it can be seen that A1B1C1Combine for the optimum level of sample dissolution time index；A2B2C2Strong for sample tension The optimum level combination of degree index.
For A factor, desirable A1Or A2, take A2When, sample dissolution time ratio takes A1Increased 14.6%, and sample tension Intensity increased 39.2%, therefore A factor takes A2.B factor can be analyzed in the same manner and take B2, C factor takes C2, excellent it is combined as A2B2C2.
I.e. optimum proportioning is：Edible salt 70%, Ludox 7.5%, 50% Aqueous Solutions of Polyethylene Glycol 5.5%, bauxite 17%.
Wet core heating embodiment
Optimum heating temperature and optimal heating and thermal insulation time, tension after the heating of technological requirement core are found out by interaction experiment Intensity >=7.0MPa.
The relation of 3 hygrometric state figure of eight tensile test piece heating-up temperature of table and tensile strength
The relation of 4 hygrometric state figure of eight tensile test piece heating and thermal insulation time of table and tensile strength
Tested by above-mentioned, 80 DEG C of wet core heating-up temperature, temperature retention time 30min are optimised process.
Core toasts embodiment
Optimum heating temperature and optimal heat time heating time, tensile strength after the baking of technological requirement core are found out by interaction experiment ≥7.8MPa.
The relation of baking temperature and tensile strength before 5 figure of eight tensile test piece coating of table
The relation of temperature retention time and tensile strength is toasted before 6 figure of eight tensile test piece coating of table
Tested by above-mentioned, before core cover, 110 DEG C of baking temperature, temperature retention time 5h are optimised process.
Core cover embodiment
Optimal baking temperature and optimal temperature retention time, technological requirement core cover after core cover are found out by interaction experiment And moisture≤0.2% after toasting.
The relation of 7 figure of eight tensile test piece coating post-heating temperature of table and moisture
The relation of 8 figure of eight tensile test piece hygrometric state base substrate heating and thermal insulation time of table and moisture
Tested by above-mentioned, after core cover, 110 DEG C of baking temperature, temperature retention time 5h are optimised process.
Casing production application embodiment
Tank material is A356, and pouring procedure is that low pressure casting, foundry goods has 48 cores, and wherein 6 can not be used normal sands The nearly closing inner chamber of core moulding adopts water-soluble core molding of the present invention, and remaining sand mold, core are with from hard furan tree Fat sand is manufactured.
1 casing water-soluble core compound 30, core preparation process is as follows：
First, raw material prepares
1. edible salt
A) 21 edible salts are weighed；
B) 21 edible salts are inserted in baking oven and heats, 650 DEG C of heating-up temperature, 3.5h is incubated, and is cooled to room temperature；
C) 7 edible salts are weighed, inserts in pulverizer and roll, after rolling time 1h, edible salt granularity is changed into 70 mesh～140 Mesh；
D) by the edible salt after rolling and the edible salt mix homogeneously not rolled.
2. bauxite
Weigh 5.1 bauxites.
3. Ludox
Weigh 2.25 Ludox.
4. Polyethylene Glycol
0.825 Polyethylene Glycol is weighed, is added in 0.825 water, treat that Polyethylene Glycol is completely dissolved.
2nd, compound is blended
1. first edible salt and bauxite are added and roll in edge runner mill, roll time 4min～6min；
2. add Ludox and Aqueous Solutions of Polyethylene Glycol is rolled, roll time 5min～8min；
3. the compound being blended is stored in stand-by in the charging basket for drying sealing.
3rd, coremaking
1., when ambient temperature is less than 15 DEG C, mould to be preheated before coremaking, 80 DEG C of preheating temperature, preheating time 20min；
2. operator makees, after fluffing of moulding sand process, compound to be added in core box to compound with handss, consolidates in charging, tamping After-blow CO2 hardens, and makes wet core；
3. core box is put in baking oven together with wet core and heats, it is 30min 80 DEG C, heat time heating time that heating-up temperature is；
4. coring is carried out by when core box is cooled to room temperature；
5. the core of taking-up is put in baking oven and toasts, it is 5h that baking temperature is 110 DEG C, baking time；
6. core is repaired, and brushes 3 layers～4 coatings；
7. the core after brush coating is put into baking in baking oven, dries on plate and puts active paper, and baking temperature is 110 DEG C, Baking time is 5h；
8. core is stored in calorstat, and temperature is 40 DEG C～45 DEG C, stand-by；
9. take out core when playing core from calorstat to use.
4th, water-soluble core performance test results
1. the time that figure of eight sample is completely dissolved in water is 298s；
2. after the heating of figure of eight sample, tensile strength is 7.1MPa；
3. after the baking of figure of eight sample, tensile strength is 7.8MPa；
4. figure of eight sample coating and after toasting moisture be.
Through monitoring, inspection：Using the casing of abovementioned technology production, the time that its water-soluble core is completely dissolved is on rule In calibration is accurate, the surface of internal cavity of institute's molding is smooth bright and clean, noresidue in inner chamber.
Raw material in above-mentioned embodiment is required：
Edible salt：For two grades of purified salt and more than, former granularity be 20 mesh～100 mesh；
Bauxite powder：The trade mark is RLF-85-33, and fineness is 30 μm～35 μm；
Ludox：The trade mark is GRJ-26, SiO2Content is 26.8%, and density is 1.16g/cm3；
Polyethylene Glycol：For PEG-400.
To sum up, the present invention has prominent substantive distinguishing features and marked improvement：
A) depoling is simple.100ml water energy dissolving 36g edible salt when 20 DEG C, edible salt from the 7.5% of prior art～ After 9.5% brings up to 70%, core dissolution improves more than 10 times, and manufactured core can be completely dissolved in hydro-blasting, and 1 Shorten 12h during part casing water-soluble core fettler.
B) core coring intensity is improved.CO2 hardening is blown as binding agent with Ludox, core wet strength is improved by 0.5MPa To more than 6MPa, facilitate coring, success rate reaches more than 95%.
C) core resistance to water soak is improved.Polyethylene Glycol is added in component, the resistance to water soak of water-soluble core is improved, raw It is not in the gas hole defect for causing because of water-soluble core in product.
D) with short production cycle.1 casing water-soluble core coremaking cycle is the core of 14h, prior art for when producing Need to carry out surface Hardening Treatment, surface Hardening Treatment complex process, 1 casing water-soluble core coremaking cycle is at least 40h.
E) energy-saving.The water-soluble core that produces need not carry out surface Hardening Treatment, and therefore energy consumption is low, and energy consumption is existing Have 1/3rd of technology.
F) environmental nonpollution.Raw materials are innocuous substance, non-environmental-pollution, and the waste water produced by hydro-blasting can Recycle.
G) save material.No compound is wasted, and mixed compound is stored in the charging basket of sealing, can 7 days storage periods More than.

Claims (10)

1. a kind of water-soluble core based on nearly closing inner chamber, it is characterised in that by raw material water soluble salt, refractory aggregate, viscous Knot agent and plasticizer composition compound, then through core box preparations, pre-treatment of raw material, be blended compound, tamping shape coremaking work step Make；The mass percent of the compound is：Edible salt 60%～80%, bauxite 2%～32%, Ludox 5%～ 10% and Aqueous Solutions of Polyethylene Glycol 3%～8%.
2. a kind of water-soluble core based on nearly closing inner chamber according to claim 1, it is characterised in that the compound Mass percent be：Edible salt 80%, bauxite 2%, Ludox 5.0% and Aqueous Solutions of Polyethylene Glycol 3.0%.
3. a kind of water-soluble core based on nearly closing inner chamber according to claim 1, it is characterised in that the compound Mass percent be：Edible salt 70%, bauxite 17%, Ludox 7.5% and Aqueous Solutions of Polyethylene Glycol 5.5%.
4. a kind of water-soluble core based on nearly closing inner chamber according to claim 1, it is characterised in that the raw material Aqueous Solutions of Polyethylene Glycol be from the Aqueous Solutions of Polyethylene Glycol that concentration is 50%.
5. a kind of water-soluble core based on nearly closing inner chamber according to claim 1, it is characterised in that described consolidate into Shape coremaking work step includes：Wet core molding, core baking, three steps of core cover.
6. a kind of preparation method of the water-soluble core based on nearly closing inner chamber, it is characterised in that the operating process of core production：
(i), core box prepares
A) core box is manufactured using aluminum alloy materials, carries out PROCESS FOR TREATMENT to the poor position of Packing character；
B) core box working surface will one layer of releasing agent of brush；
C) when ambient temperature is less than 15 DEG C, mould to be preheated before coremaking, 60～80 DEG C of preheating temperature, preheating time 15 ～20min；
(ii), pre-treatment of raw material
A) edible salt roasting：
1. in advance by edible salt roasting, 600 DEG C～700 DEG C of sintering temperature, temperature retention time 3h～4h, it is cooled to stand-by after room temperature；
B) edible salt granularity joins level
1. join that to take the undressed edible salt of certain amount stand-by, edible salt granularity be；
2. join the edible salt for taking the fired process of certain amount, in pulverizer, powdering is rolled over, granularity is 70～140 mesh；
3. undressed edible salt is carried out ratio with the edible salt of roasting spreading to mix；
C) Aqueous Solutions of Polyethylene Glycol is prepared
1. water is 1: 1 with the configuration proportion of Polyethylene Glycol, adds 1 Polyethylene Glycol in 1 water, is used for until completely dissolved mixing Compound processed；
(iii), compound is blended
A) by proportioning, various raw materials have been weighed；
B) first edible salt and bauxite being added and roll in edge runner mill, the time is rolled for 4min～6min；
C) add Ludox and Aqueous Solutions of Polyethylene Glycol rolls 5min～8min；
D) compound being blended is stored in the charging basket for drying sealing, stand-by；
(iv), tamping shaping coremaking
A) wet core molding；
1. first the craft fluffing of moulding sand processes compound；
2. the compound after processing is added in core box；
3. consolidate in charging；
4. after-blow CO is consolidated2Hardening, wet core makes molding；
B) core baking
1. core box is together put in baking oven together with wet core and heats；
2. it is 25～35min 80～90 DEG C, heat time heating time that heating-up temperature is；
3. optimal heats：It is preferred that optimum heating temperature, heat time heating time；
4. coring is carried out by when core box is cooled to room temperature；
5. the core for taking out is placed again into baking in baking oven；
6. baking temperature is 60～160 DEG C, and baking time is 5～7h；
7. optimal cured effect：It is preferred that optimal baking temperature, baking time；
C) core cover
1. core, brush coating number layer are repaired；
2. core, preferably brush coating coating are repaired；
3. the core after brush coating is put into baking in baking oven, and arranges moisture absorption class medium in drying on plate；
4. baking temperature is 110～120 DEG C, and baking time is 5～7h；
5. optimal cured effect：It is preferred that optimal baking temperature, baking time；
6. above-mentioned making finished product/core, is stored in calorstat, 40～45 DEG C of temperature；
When 7. playing core to use, take out from calorstat.
7. the preparation method of a kind of water-soluble core based on nearly closing inner chamber according to claim 6, it is characterised in that A) step in operating process core box preparation (i)：PROCESS FOR TREATMENT to the poor position of Packing character：Packed art hole is set.
8. the preparation method of a kind of water-soluble core based on nearly closing inner chamber according to claim 6, it is characterised in that B in operating process pre-treatment of raw material (ii)) step：The mixing of the edible salt of undressed edible salt and roasting spreading Ratio is 2: 1.
9. the preparation method of a kind of water-soluble core based on nearly closing inner chamber according to claim 6, it is characterised in that C in operating process tamping shaping coremaking (iv)) step：Finishing core, preferably 3 layers～4 layers of brush coating coating.
10. a kind of preparation method of the water-soluble core based on nearly closing inner chamber described in claim 6, it is characterised in that behaviour Make the c in flow process tamping shaping coremaking (iv)) step：The moisture absorption class medium for arranging on plate of drying of baking oven is active paper.
CN201611099854.5A 2016-12-02 2016-12-02 Water-soluble core based on near-closed inner cavity and preparation method of water-solute core based on near-closed inner cavity Pending CN106424583A (en)

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CN107838365A (en) * 2017-11-02 2018-03-27 深圳市爱能森科技有限公司 A kind of soluble core based on Binary Salts System and preparation method and application
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CN108555226A (en) * 2018-04-28 2018-09-21 安徽工业大学 A kind of preparation method of the additive of water-soluble core
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