CN104959536A - Preparation method of easy-to-clear aluminum chloride hardened water glass shell mold for investment casting - Google Patents
Preparation method of easy-to-clear aluminum chloride hardened water glass shell mold for investment casting Download PDFInfo
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- CN104959536A CN104959536A CN201510460182.5A CN201510460182A CN104959536A CN 104959536 A CN104959536 A CN 104959536A CN 201510460182 A CN201510460182 A CN 201510460182A CN 104959536 A CN104959536 A CN 104959536A
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Abstract
The invention discloses a preparation method of an easy-to-clear aluminum chloride hardened water glass shell mold for investment casting. The preparation method comprises the following steps: firstly, preparing a coating mixed solution from such raw materials as an ethyl silicate hydrolysate and industrial alcohol, secondly, forming a shell mold surface coating, and finally, secondarily roasting the shell mold with the surface coating to obtain the ethyl silicate coated shell mold. According to the preparation method, the step of forming the surface coating of the roasted water glass shell mold is added, the surface coated water glass shell mold is roasted secondarily, the residual shell lest after a casting is poured is easy to strip and the purpose of easy sand clearing is achieved; besides, the surface quality of the casting is obviously improved, and therefore, the problems of poor surface quality of the aluminum chloride hardened shell mold and difficult sand clearing after casting pouring are solved; in addition, the surface quality of the casting is improved, and even though the steps of surface coating and secondary roasting are added, the increase of the cost of the whole process is extremely limited.
Description
Technical field
The present invention relates to hot investment casting field, especially relate to a kind of preparation method of aluminium chloride Hardening Sodium Silicate fine casting shell of easy to clean.Residual shell after adopting crystal aluminum chloride saturated aqueous solution Hardening Sodium Silicate shell to carry out casting large steel-casting easily comes off, clears up process efficiently.
Background technology
Sodium silicate shell full form casting process is a kind of low cost investment casting method introducing the former Soviet Union, the method adopts paraffin, stearic acid low temperature mould material, shell paint adhesion processed agent is waterglass, adopts hot water or low-pressure steam dewaxing, to produce low-alloy steel and ordinary carbon steel foundry goods.
At present, most domestic adopts waterglass as binding agent in hot investment casting is produced, adopt crystal aluminum chloride to replace ammonium chloride to be used for investment casting shell sclerosis, have steady quality, investment shell intensity high, without ammonia pollution, improve operative's condition and the advantage such as overall economic efficiency is good.But also there are some problems in it, mainly contain in production application: one is that the surperficial defect existed of shell that aluminium chloride hardens is more, and the surface roughness of foundry goods is poor; Two is because the retained strength of the shell of aluminium chloride sclerosis is high and collapsibility is poor, causes cast cleaning difficulty.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of aluminium chloride Hardening Sodium Silicate fine casting shell of easy to clean, the feature of the method is: sodium silicate shell surface after baking increases coating, and effects on surface sprayed after sodium silicate shell carry out after baking, water the residual shell after outpouring foundry goods easily to come off, reach the object that sand removal is easy, and surface quality of continuous castings be improved significantly.
The object of the present invention is achieved like this:
A preparation method for the aluminium chloride Hardening Sodium Silicate fine casting shell of easy to clean, feature is:
A, preparation coating mixed liquor: by volume percentage, get silicate hydrolyzate liquid 85-95%, industrial alcohol 5-15%, add industrial alcohol, stir in silicate hydrolyzate liquid, obtain the coating mixed liquor of essence casting casting, standing more than 16 hours are stand-by;
B, making shell face coat: when the temperature of the sodium silicate shell after dewaxing and roasting being cooled to 300-400 DEG C, pour prepared coating mixed liquor into, the inner surface of shell must infiltrate or apply evenly, leave standstill after 2-5 minute, pour out coating mixed liquor, blow the inner surface 10-20 minute of shell with air-heater, repeat said process three times continuously, made coating on the surface of shell;
C, the shell making face coat is carried out after baking, the after baking technique of shell: the shell making face coat is put into roaster, no longer carries out low-temperature prewarming, is directly heated to 800 DEG C, be incubated 30 minutes, just obtain the shell scribbling silester coating.
The present invention is directed to dewaxing roasting complete after sodium silicate shell, increase make face coat, this coating surface membrane formation mechanism is:
Coating formula is made up of silicate hydrolyzate liquid and industrial alcohol, and the alcohol wherein added with silicate hydrolyzate liquid arbitrarily than mixing, mainly because it has easily been waved, can make shell rapid draing based on it.Silicate hydrolyzate reaction is exactly ethyoxyl (-C in silester
2h
5o) progressively replace by the hydroxyl (-OH) in water, constantly polycondensation reaction generates organosilicon polymer again, and this thing, in heat dehydration, is all transformed into silica dioxide gel substantially.
Increase the coating on making shell surface mainly based on this SiO
2gel, evenly can be attached to the shell surface after dewaxing, roasting, through three SiO
2gel repeats to be coated with and air-heater drying, and finally carry out secondary 800 DEG C of roastings to shell, be incubated 30 minutes, silica dioxide gel dehydrating and curing becomes face coat film.This face coat intercepts original aluminium chloride Hardening Sodium Silicate fine casting shell surface, and with the contact of the high-temperature liquid metal of cast, so water the foundry goods easy to clean outpoured, it is more excellent that more original shell waters the surface quality outpouring foundry goods.
Its chemical formula is:
Si(OC
2H
5)
4+ 4H
2O = Si(OH )
4+ 4C
2H
5OH （1）
H
4SiO
4=SiO
2+2 H
2O （2）
Feature of the present invention is: increase the sodium silicate shell face coat after making roasting, sodium silicate shell after effects on surface has sprayed carries out after baking, water the residual shell after outpouring foundry goods easily to come off, reach the object that sand removal is easy, and surface quality of continuous castings be improved significantly, thus the problem of sand removal difficulty after solving poor, the pouring cast part of Surface Quality of Mould Shell of aluminium chloride sclerosis, and improve surface quality of continuous castings, and increase face coat and the cost increase of after baking to whole technique very limited.
Preparation technology's cost of the present invention is low, and making face coat and after baking increase few to the cost of whole technique, the advantage of uncontaminated gases ammonia emission, and the foundry goods easy to clean of made shell cast, and surface quality is good.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further elaborated, it should be noted that the time of after baking can set according to the shell of different size: embodiment 1:
A preparation method for the aluminium chloride Hardening Sodium Silicate fine casting shell of easy to clean, the coating mixed liquor of first preparation essence casting casting, standing more than 16 hours stand-by.The by volume configuration of percentage, gets silicate hydrolyzate liquid 95%, adds 5% industrial alcohol, stirs.Poured into by prepared coating mixed liquor, dewaxing and roasting complete and are cooled in 300 DEG C of sodium silicate shells, and coating mixed liquor must touch all shell inner surfaces again, leave standstill after 2 minutes, pour out coating mixed liquor, blow shell inner surface 10 minutes with air-heater, this process continuously in triplicate.Then the shell making face coat is put into roaster, no longer carry out low-temperature prewarming, direct control temperature, to 800 DEG C, is incubated 30 minutes, finally carries out casting of metals.
Embodiment 2:
A preparation method for the aluminium chloride Hardening Sodium Silicate fine casting shell of easy to clean, the coating mixed liquor of first preparation essence casting casting, standing more than 16 hours stand-by.The by volume configuration of percentage, gets silicate hydrolyzate liquid 90%, adds 10% industrial alcohol, stirs.Poured into by prepared coating mixed liquor, dewaxing and roasting complete and are cooled in 350 DEG C of sodium silicate shells, and coating mixed liquor must touch all shell inner surfaces again, leave standstill after 3 minutes, pour out coating mixed liquor, blow shell inner surface 15 minutes with air-heater, this process continuously in triplicate.Then the shell making face coat is put into roaster, no longer carry out low-temperature prewarming, direct control temperature, to 800 DEG C, is incubated 30 minutes, finally carries out casting of metals.
Embodiment 3:
A preparation method for the aluminium chloride Hardening Sodium Silicate fine casting shell of easy to clean, the coating mixed liquor of first preparation essence casting casting, standing more than 16 hours stand-by.The by volume configuration of percentage, gets silicate hydrolyzate liquid 85%, adds 15% industrial alcohol, stirs.Poured into by prepared coating mixed liquor, dewaxing and roasting complete and are cooled in 380 DEG C of sodium silicate shells, and coating mixed liquor must touch all shell inner surfaces again, leave standstill after 4 minutes, pour out coating mixed liquor, blow shell inner surface 18 minutes with air-heater, this process continuously in triplicate.Then the shell making face coat is put into roaster, no longer carry out low-temperature prewarming, direct control temperature, to 800 DEG C, is incubated 30 minutes, finally carries out casting of metals.
Embodiment 4:
A preparation method for the aluminium chloride Hardening Sodium Silicate fine casting shell of easy to clean, first preparation essence casting casting silicate hydrolyzate liquid, standing more than 16 hours stand-by.The by volume configuration of percentage, gets silicate hydrolyzate liquid 92%, adds 8% industrial alcohol, stirs.Poured into by prepared coating mixed liquor, dewaxing and roasting complete and are cooled in 400 DEG C of sodium silicate shells, and coating mixed liquor must touch all shell inner surfaces again, leave standstill after 5 minutes, pour out coating mixed liquor, blow shell inner surface 20 minutes with air-heater, this process continuously in triplicate.Then the shell making face coat is put into roaster, no longer carry out low-temperature prewarming, direct control temperature, to 800 DEG C, is incubated 30 minutes, finally carries out casting of metals.
Claims (3)
1. a preparation method for the aluminium chloride Hardening Sodium Silicate fine casting shell of easy to clean, is characterized in that:
A, preparation coating mixed liquor: in silicate hydrolyzate liquid, add industrial alcohol, stir, obtain the coating mixed liquor of essence casting casting, standing more than 16 hours stand-by;
B, making shell face coat: by the cooling of the temperature of the sodium silicate shell after dewaxing and roasting, pour prepared coating mixed liquor into, the inner surface of shell must infiltrate or apply evenly, leave standstill after 2-5 minute, pour out coating mixed liquor, blow the inner surface 10-20 minute of shell with air-heater, repeat said process three times continuously, made coating on the surface of shell;
C, the shell making face coat is carried out after baking, the after baking technique of shell: the shell making face coat is put into roaster, no longer carries out low-temperature prewarming, is directly heated to 800 DEG C, be incubated 30 minutes, just obtain the shell scribbling silester coating.
2. preparation method according to claim 1, is characterized in that: coating mixed liquor is by volume percentages, silicate hydrolyzate liquid: 85-95%, industrial alcohol: 5-15%.
3. preparation method according to claim 1, is characterized in that: the chilling temperature of sodium silicate shell in step B after dewaxing and roasting is 300-400 DEG C.
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|---|---|---|---|
| CN201510460182.5A CN104959536A (en) | 2015-07-31 | 2015-07-31 | Preparation method of easy-to-clear aluminum chloride hardened water glass shell mold for investment casting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510460182.5A CN104959536A (en) | 2015-07-31 | 2015-07-31 | Preparation method of easy-to-clear aluminum chloride hardened water glass shell mold for investment casting |
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| CN104959536A true CN104959536A (en) | 2015-10-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108127087A (en) * | 2017-12-20 | 2018-06-08 | 广州番禺职业技术学院 | A kind of method of roasting for promoting the removing of casting mold residual carbon |
Citations (6)
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|---|---|---|---|---|
| JPS56102345A (en) * | 1980-01-21 | 1981-08-15 | Mitsubishi Heavy Ind Ltd | Treatment of mold surface |
| JPS56117851A (en) * | 1980-02-21 | 1981-09-16 | Suzuki Motor Co Ltd | Ceramic mold for precision casting |
| JPH01262041A (en) * | 1988-04-13 | 1989-10-18 | Toyama Pref Gov | Manufacture of mold and core |
| CN104107879A (en) * | 2014-04-25 | 2014-10-22 | 西安航空动力股份有限公司 | Ceramic secondary reinforcement method |
| CN104174814A (en) * | 2014-09-16 | 2014-12-03 | 沈阳飞机工业（集团）有限公司 | Ethyl silicate hydrolysate and preparation method and application thereof |
| CN104384452A (en) * | 2014-10-24 | 2015-03-04 | 沈阳黎明航空发动机(集团)有限责任公司 | Preparation technique for thin-walled silica-based ceramic mold core |
-
2015
- 2015-07-31 CN CN201510460182.5A patent/CN104959536A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56102345A (en) * | 1980-01-21 | 1981-08-15 | Mitsubishi Heavy Ind Ltd | Treatment of mold surface |
| JPS56117851A (en) * | 1980-02-21 | 1981-09-16 | Suzuki Motor Co Ltd | Ceramic mold for precision casting |
| JPH01262041A (en) * | 1988-04-13 | 1989-10-18 | Toyama Pref Gov | Manufacture of mold and core |
| CN104107879A (en) * | 2014-04-25 | 2014-10-22 | 西安航空动力股份有限公司 | Ceramic secondary reinforcement method |
| CN104174814A (en) * | 2014-09-16 | 2014-12-03 | 沈阳飞机工业（集团）有限公司 | Ethyl silicate hydrolysate and preparation method and application thereof |
| CN104384452A (en) * | 2014-10-24 | 2015-03-04 | 沈阳黎明航空发动机(集团)有限责任公司 | Preparation technique for thin-walled silica-based ceramic mold core |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108127087A (en) * | 2017-12-20 | 2018-06-08 | 广州番禺职业技术学院 | A kind of method of roasting for promoting the removing of casting mold residual carbon |
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Application publication date: 20151007 |