CN102873263A - Lost foam casting technology for sand burning-resistance cast steel - Google Patents
Lost foam casting technology for sand burning-resistance cast steel Download PDFInfo
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- CN102873263A CN102873263A CN2012103200265A CN201210320026A CN102873263A CN 102873263 A CN102873263 A CN 102873263A CN 2012103200265 A CN2012103200265 A CN 2012103200265A CN 201210320026 A CN201210320026 A CN 201210320026A CN 102873263 A CN102873263 A CN 102873263A
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Abstract
The invention relates to a lost foam casting technology for sand burning-resistance cast steel. The lost foam casting technology comprises the following steps of: fabricating a model cluster, preparing coating for an inner layer, preparing coating for an outer layer, dealing with the lost foaming casting pattern with the coating for the inner layer and the coating for the outer layer, performing vibration modeling, casting and replacing, cooling and the like. From analysis on coating relic, the coating is not invaded by liquid steel, melted glass is filled among fire-resistant aggregate particles of the inner layer of the coating, thereby preventing invasion of the liquid steel and avoiding sand burning of the casting at the same time.
Description
Technical field
The present invention relates to casting field, particularly lost foam cast steel manufacturing technology field is specifically related to a kind of anti-scab cast steel lost foam casting process.
Background technology
Lost foam casting (claiming again cavityless casting) is that the bubbles model bonding similar to the casting dimension shape is combined into model cluster, after brushing fireproof coating and oven dry, be embedded in vibration molding in the dried quartz sand, under negative pressure, pour into a mould, make the model gasification, liquid metals occupies modal position, solidifies the rear novel casting method that forms foundry goods of cooling.
Compare with the conventional cast technology, lost foam casting has following characteristics: 1. casting quality is good, and cost is low; 2. material is not limit, and size is all suitable; 3. dimensional accuracy is high, and any surface finish reduces the cleaning work amount; 4. internal flaw greatly reduces, dense structure; 5. can realize extensive, production in enormous quantities, can greatly improve operating environment, reduce labour intensity, reduce energy resource consumption.
Although lost foam casting process is comparatively fast developed at present, coating technology does not also reach desirable requirement.Directly affect the quality of foundry goods because of coating property, coating contacts except isolating metal liquid and the direct of molding sand, prevents that foundry goods from producing outside penetration and the chemical scab, also has an important function: form and keep the foundry goods die cavity.So must have higher normal temperature strength and elevated temperature strength, and suitable hot permeability will be arranged.
Yet the quality of coating also has the shortcoming of each side at present, and such as in casting production, after the casting cooling, lost foam paint is not easy to peel off from foundry goods, significantly increases follow-up grinder buffing processing cost.
For above-mentioned phenomenon, the applicant analyzes through the coating relic, and the coating internal layer directly contacts with molten steel, and skin directly contacts with molding sand.During casting, high-temperature molten steel is can be with the coating internal layer wetting and immerse the Grain of coating aggregate gap.Wait cast complete after, in foundry goods Slow cooling process, molten steel condenses into one with coating and foundry goods, thereby makes coating be difficult to peel off from cast(ing) surface.
Learn to only have the molten steel of allowing to immerse the particles of aggregates gap from above analysis, form obvious line of demarcation, just can avoid this phenomenon.Yet because particles of aggregates can not be too little, descend otherwise can make gas permeability, the apperance gasification product can not appear smoothly, can cause pore, slag inclusion phenomenon, so that casting quality descends.
Summary of the invention
For defective of the prior art, the applicant makes adjustment to the prescription of coating, makes coating inside can generate the glassy phase of one deck molten condition when high temperature is poured into a mould, and so just can successfully be blocked in molten steel and infiltrate between the refractory aggregate.
The object of the present invention is to provide a kind of anti-scab cast steel lost foam casting process.
In order to realize the foregoing invention purpose, the technical solution used in the present invention is as follows:
A kind of anti-scab cast steel lost foam casting process comprises following steps:
1) bubbles model bonding that will be similar to the casting dimension shape is combined into model cluster;
2) coating in the preparation:
A) in bentonite, add entry, obtain bentonite slurry after the high-speed stirred;
B) waterglass, sodium carboxymethylcellulose, n-octyl alcohol, AEO are added to the water, are mixed with the aqueous solution;
C) bentonite slurry that step a) is obtained and silica flour add in the aqueous solution that step b) obtains, and add under constantly stirring that entry is mixed makes interior coating;
3) preparation outer layer coating:
D) in sodium bentonite, add entry, obtain the sodium bentonite slurry after the high-speed stirred;
E) white colloidal sol, sodium carboxymethylcellulose, n-octyl alcohol, AEO are added to the water, are mixed with the aqueous solution;
F) in the aqueous solution that the sodium bentonite slurry that step d) is obtained and the beautiful adding of high chrome step e) obtain, under constantly stirring, adding the mixed outer layer coating of making of entry;
4) the evaporative pattern apperance at first immerses interior coating, the dry processing after taking out; Hang again after the drying and be coated with outer layer coating, drying;
5) model that step 4) is obtained places in the sandbox, fills out to do huskyly, shakes consolidation, covered with plastic film and to vacuumizing in the sandbox on sandbox;
6) molten metal is cast to model area, the evaporative pattern gasification, the metal replacement model takes out foundry goods after cooling.
Further, step 2) prepares the ratio of each component is of interior coating in: silica flour 25 ~ 75 weight portions, bentonite 1 ~ 3 weight portion, waterglass 0.5 ~ 1.5 weight portion, sodium carboxymethylcellulose 0.75 ~ 2.25 weight portion, n-octyl alcohol 0.15 ~ 0.45 weight portion, AEO 0.15 ~ 0.45 weight portion.
In an embodiment of the present invention, step 2) prepares the ratio of each component is of interior coating in: silica flour 50 weight portions, bentonite 2 weight portions, waterglass 1 weight portion, sodium carboxymethylcellulose 1.5 weight portions, n-octyl alcohol 0.3 weight portion, AEO 0.3 weight portion.
In the step a), the weight ratio of the water of bentonite and adding is 1:10; In the step b), the weight ratio of the water of waterglass and adding is 1:20; In the step c), silica flour is 1:1 with the weight ratio of the water that adds under constantly stirring.
Further, prepare the ratio of each component is of outer layer coating in the step 3): high chrome jade 25 ~ 75 weight portions, sodium bentonite 1.5 ~ 4.5 weight portions, white colloidal sol 0.25 ~ 0.75 weight portion, sodium carboxymethylcellulose 0.75 ~ 2.25 weight portion, n-octyl alcohol 0.15 ~ 0.45 weight portion, AEO 0.15 ~ 0.45 weight portion.
In an embodiment of the present invention, prepare the ratio of each component is of outer layer coating in the step 3): beautiful 50 weight portions of high chrome, sodium bentonite 3 weight portions, white colloidal sol 0.5 weight portion, sodium carboxymethylcellulose 1.5 weight portions, n-octyl alcohol 0.3 weight portion, AEO 0.3 weight portion.
In the step d), the weight ratio of the water of sodium bentonite and adding is 1:10; In the step e), the weight ratio of the water of white colloidal sol and adding is 1:40; In the step f), the weight ratio of the beautiful water with adding under constantly stirring of high chrome is 1:1.
Further, step c) and f) in agitating mode be: the gas that first high-speed stirred is involved in coating and the outer layer coating in stirring at low speed was discharged again in 1 hour keeps stirring at low speed about 10 hours.
In an embodiment of the present invention, hanging the number of times that is coated with outer layer coating in the step 4) is 2-5 time.Baking temperature is 40 ~ 60 ℃, and be 2-8 hour drying time.
The present invention has following beneficial effect: after the foundry goods cooling, most of smear is peeled off from cast(ing) surface automatically, peels off remarkably productive.Even the coating that small part is not peeled off, subsequent treatment are also greatly simplified, saved a large amount of artificial.Analyze through the coating relic, coating is not invaded by molten steel, and the glassy phase that is melted between the refractory aggregate particle of coating internal layer is filled, and has stoped the invasion of molten steel, has avoided the foundry goods scab phenomenon simultaneously yet.
Description of drawings
Fig. 1 is the flow chart of anti-scab cast steel lost foam casting process disclosed by the invention.
The specific embodiment
The invention will be further described below in conjunction with embodiment, but and unrestricted range of application of the present invention.
Embodiment 1
A kind of anti-scab cast steel lost foam casting process comprises following steps:
1) bubbles model bonding that will be similar to the casting dimension shape is combined into model cluster;
2) coating in the preparation:
A) add 10 weight parts waters in 1 weight portion bentonite, high-speed stirred obtained bentonite slurry after 5 hours;
B) 1.5 weight parts water glass, 2.25 weight portion sodium carboxymethylcelluloses, 0.15 weight portion n-octyl alcohol, 0.45 weight portion AEO add in 30 weight parts waters, are mixed with the aqueous solution;
C) in the aqueous solution that the bentonite slurry that step a) is obtained and 25 weight portion silica flours adding step b) obtain, adding 25 weight parts waters mix and make interior coating under constantly stirring, agitating mode is: the gas that first high-speed stirred 1 hour is involved in the coating in stirring at low speed is discharged again kept stirring at low speed 8 hours;
3) preparation outer layer coating:
D) add 15 weight parts waters in 1.5 weight portion sodium bentonites, high-speed stirred obtains the sodium bentonite slurry after 7 hours;
E) the white colloidal sol of 0.75 weight portion, 2.25 weight portion sodium carboxymethylcelluloses, 0.15 weight portion n-octyl alcohol, 0.45 weight portion AEO are added in 30 weight parts waters, be mixed with the aqueous solution;
F) in the aqueous solution that the sodium bentonite slurry that step d) is obtained and the beautiful adding of 25 weight portion high chrome step e) obtain, under constantly stirring, add the mixed outer layer coating of making of 25 weight parts waters, agitating mode is: first high-speed stirred 1 hour again stirring at low speed is discharged the gas that is involved in the outer layer coating, keeps stirring at low speed 11 hours;
4) the evaporative pattern apperance at first immerses interior coating, the dry processing after taking out; Hang again after the drying and be coated with outer layer coating, drying;
5) model that step 4) is obtained places in the sandbox, fills out to do huskyly, shakes consolidation, covered with plastic film and to vacuumizing in the sandbox on sandbox;
6) molten metal is cast to model area, the evaporative pattern gasification, the metal replacement model takes out foundry goods after cooling.
Embodiment 2
A kind of anti-scab cast steel lost foam casting process comprises following steps:
1) bubbles model bonding that will be similar to the casting dimension shape is combined into model cluster;
2) coating in the preparation:
A) add 30 weight parts waters in 3 weight portion bentonites, high-speed stirred obtained bentonite slurry after 7 hours;
B) 0.5 weight parts water glass, 0.75 weight portion sodium carboxymethylcellulose, 0.45 weight portion n-octyl alcohol, 0.15 weight portion AEO are added in 10 weight parts waters, be mixed with the aqueous solution;
C) in the aqueous solution that the bentonite slurry that step a) is obtained and 75 weight portion silica flours adding step b) obtain, adding 75 weight parts waters mix and make interior coating under constantly stirring, agitating mode is: the gas that first high-speed stirred 1 hour is involved in the coating in stirring at low speed is discharged again kept stirring at low speed 10 hours;
3) preparation outer layer coating:
D) add 45 weight parts waters in 4.5 weight portion sodium bentonites, high-speed stirred obtains the sodium bentonite slurry after 5 hours;
E) the white colloidal sol of 0.75 weight portion, 0.75 weight portion sodium carboxymethylcellulose, 0.15 weight portion n-octyl alcohol, 0.45 weight portion AEO are added in 30 weight parts waters, be mixed with the aqueous solution;
F) in the aqueous solution that the sodium bentonite slurry that step d) is obtained and the beautiful adding of 75 weight portion high chrome step e) obtain, under constantly stirring, add the mixed outer layer coating of making of 75 weight parts waters, agitating mode is: first high-speed stirred 1 hour again stirring at low speed is discharged the gas that is involved in the outer layer coating, keeps stirring at low speed 10 hours;
4) the evaporative pattern apperance at first immerses interior coating, the dry processing after taking out; Hang again after the drying and be coated with outer layer coating, drying;
5) model that step 4) is obtained places in the sandbox, fills out to do huskyly, shakes consolidation, covered with plastic film and to vacuumizing in the sandbox on sandbox;
6) molten metal is cast to model area, the evaporative pattern gasification, the metal replacement model takes out foundry goods after cooling.
Embodiment 3
A kind of anti-scab cast steel lost foam casting process comprises following steps:
1) bubbles model bonding that will be similar to the casting dimension shape is combined into model cluster;
2) coating in the preparation:
A) add 20 weight parts waters in 2 weight portion bentonites, high-speed stirred obtained bentonite slurry after 6 hours;
B) 1 weight parts water glass, 1.5 weight portion sodium carboxymethylcelluloses, 0.3 weight portion n-octyl alcohol, 0.3 weight portion AEO are added in 20 weight parts waters, be mixed with the aqueous solution;
C) in the aqueous solution that the bentonite slurry that step a) is obtained and 50 weight portion silica flours adding step b) obtain, adding 50 weight parts waters mix and make interior coating under constantly stirring, agitating mode is: the gas that first high-speed stirred 1 hour is involved in the coating in stirring at low speed is discharged again kept stirring at low speed 11 hours;
3) preparation outer layer coating:
D) add 30 weight parts waters in 3 weight portion sodium bentonites, high-speed stirred obtains the sodium bentonite slurry after 6 hours;
E) the white colloidal sol of 0.5 weight portion, 1.5 weight portion sodium carboxymethylcelluloses, 0.3 weight portion n-octyl alcohol, 0.3 weight portion AEO are added in 20 weight parts waters, be mixed with the aqueous solution;
F) in the aqueous solution that the sodium bentonite slurry that step d) is obtained and the beautiful adding of 50 weight portion high chrome step e) obtain, under constantly stirring, add the mixed outer layer coating of making of 50 weight parts waters, agitating mode is: first high-speed stirred 1 hour again stirring at low speed is discharged the gas that is involved in the outer layer coating, keeps stirring at low speed 11 hours;
4) the evaporative pattern apperance at first immerses interior coating, the dry processing after taking out; Hang again after the drying and be coated with outer layer coating, drying;
5) model that step 4) is obtained places in the sandbox, fills out to do huskyly, shakes consolidation, covered with plastic film and to vacuumizing in the sandbox on sandbox;
6) molten metal is cast to model area, the evaporative pattern gasification, the metal replacement model takes out foundry goods after cooling.
In an embodiment of the present invention, can hang according to the foundry goods situation and be coated with outer layer coating repeatedly, for example 2-5 time.In addition, gas forming amount when pouring into a mould for reducing, guarantee casting quality, after being coated with and coating, foam plastics mould must dry, guarantee to make enough drying times coating oven dry, baking thoroughly, temperature is controlled at the 40-60 degree, time 2-8 hour, use in case of necessity microwave drying dry, can finish dry run in the short time.
The above is preferred embodiment of the present invention only, is not to limit practical range of the present invention; If do not break away from the spirit and scope of the present invention, the present invention is made amendment or is equal to replacement, all should be encompassed in the middle of the protection domain of claim of the present invention.
Claims (10)
1. an anti-scab cast steel lost foam casting process is characterized in that, comprises following steps:
1) bubbles model bonding that will be similar to the casting dimension shape is combined into model cluster;
2) coating in the preparation:
A) in bentonite, add entry, obtain bentonite slurry after the high-speed stirred;
B) waterglass, sodium carboxymethylcellulose, n-octyl alcohol, AEO are added to the water, are mixed with the aqueous solution;
C) bentonite slurry that step a) is obtained and silica flour add in the aqueous solution that step b) obtains, and add under constantly stirring that entry is mixed makes interior coating;
3) preparation outer layer coating:
D) in sodium bentonite, add entry, obtain the sodium bentonite slurry after the high-speed stirred;
E) white colloidal sol, sodium carboxymethylcellulose, n-octyl alcohol, AEO are added to the water, are mixed with the aqueous solution;
F) in the aqueous solution that the sodium bentonite slurry that step d) is obtained and the beautiful adding of high chrome step e) obtain, under constantly stirring, adding the mixed outer layer coating of making of entry;
4) the evaporative pattern apperance at first immerses interior coating, the dry processing after taking out; Hang again after the drying and be coated with outer layer coating, drying;
5) model that step 4) is obtained places in the sandbox, fills out to do huskyly, shakes consolidation, covered with plastic film and to vacuumizing in the sandbox on sandbox;
6) molten metal is cast to model area, the evaporative pattern gasification, the metal replacement model takes out foundry goods after cooling.
2. anti-scab cast steel lost foam casting process according to claim 1, it is characterized in that, step 2) prepares the ratio of each component is of interior coating in: silica flour 25 ~ 75 weight portions, bentonite 1 ~ 3 weight portion, waterglass 0.5 ~ 1.5 weight portion, sodium carboxymethylcellulose 0.75 ~ 2.25 weight portion, n-octyl alcohol 0.15 ~ 0.45 weight portion, AEO 0.15 ~ 0.45 weight portion.
3. anti-scab cast steel lost foam casting process according to claim 2, it is characterized in that, step 2) prepares the ratio of each component is of interior coating in: silica flour 50 weight portions, bentonite 2 weight portions, waterglass 1 weight portion, sodium carboxymethylcellulose 1.5 weight portions, n-octyl alcohol 0.3 weight portion, AEO 0.3 weight portion.
4. according to claim 2 or the preparation method of 3 described anti-scab cast steel lost foam paints, it is characterized in that, in the step a), the weight ratio of the water of bentonite and adding is 1:10; In the step b), the weight ratio of the water of waterglass and adding is 1:20; In the step c), silica flour is 1:1 with the weight ratio of the water that adds under constantly stirring.
5. anti-scab cast steel lost foam casting process according to claim 1, it is characterized in that, prepare the ratio of each component is of outer layer coating in the step 3): high chrome jade 25 ~ 75 weight portions, sodium bentonite 1.5 ~ 4.5 weight portions, white colloidal sol 0.25 ~ 0.75 weight portion, sodium carboxymethylcellulose 0.75 ~ 2.25 weight portion, n-octyl alcohol 0.15 ~ 0.45 weight portion, AEO 0.15 ~ 0.45 weight portion.
6. anti-scab cast steel lost foam casting process according to claim 4, it is characterized in that, prepare the ratio of each component is of outer layer coating in the step 3): beautiful 50 weight portions of high chrome, sodium bentonite 3 weight portions, white colloidal sol 0.5 weight portion, sodium carboxymethylcellulose 1.5 weight portions, n-octyl alcohol 0.3 weight portion, AEO 0.3 weight portion.
7. according to claim 5 or the preparation method of 6 described anti-scab cast steel lost foam paints, it is characterized in that, in the step d), the weight ratio of the water of sodium bentonite and adding is 1:10; In the step e), the weight ratio of the water of white colloidal sol and adding is 1:40; In the step f), the weight ratio of the beautiful water with adding under constantly stirring of high chrome is 1:1.
8. anti-scab cast steel lost foam casting process according to claim 1, it is characterized in that, step c) and f) in agitating mode be: the gas that first high-speed stirred 1 hour is involved in coating and the outer layer coating in stirring at low speed is discharged again keeps stirring at low speed about 10 hours.
9. anti-scab cast steel lost foam casting process according to claim 1 is characterized in that, in the step 4), hanging the number of times that is coated with outer layer coating is 2-5 time.
10. anti-scab cast steel lost foam casting process according to claim 1 is characterized in that, in the step 4), baking temperature is 40 ~ 60 ℃, and be 2-8 hour drying time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210320026.5A CN102873263B (en) | 2012-08-31 | 2012-08-31 | Lost foam casting technology for sand burning-resistance cast steel |
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| CN201210320026.5A CN102873263B (en) | 2012-08-31 | 2012-08-31 | Lost foam casting technology for sand burning-resistance cast steel |
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| CN102873263B CN102873263B (en) | 2014-09-17 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103418745A (en) * | 2013-07-12 | 2013-12-04 | 西华大学 | String casting method for filling sand mold lost foams piece by piece (group) |
| CN104226907A (en) * | 2014-09-30 | 2014-12-24 | 无锡康柏斯机械科技有限公司 | Lost foam casting process capable of compacting sand further |
| CN104226905A (en) * | 2014-09-01 | 2014-12-24 | 山西模范机械制造有限公司 | Technology for guaranteeing cleanness of water channel of cylinder body of evanescent mode casting dry type internal combustion engine |
| CN107470551A (en) * | 2017-08-26 | 2017-12-15 | 上海魁殊自动化科技有限公司 | A kind of mold wash and its compound method |
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| JPH1157937A (en) * | 1997-08-22 | 1999-03-02 | Isuzu Motors Ltd | Method for casting piston by lost foam process |
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| CN102039372A (en) * | 2011-01-11 | 2011-05-04 | 大连鸿骏源机械有限公司 | Lost foam casting method |
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| JPS57109539A (en) * | 1980-12-27 | 1982-07-08 | Akaishi Kozan Kk | Casting sand for preventing sand burning of casting and method of application |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103418745A (en) * | 2013-07-12 | 2013-12-04 | 西华大学 | String casting method for filling sand mold lost foams piece by piece (group) |
| CN104226905A (en) * | 2014-09-01 | 2014-12-24 | 山西模范机械制造有限公司 | Technology for guaranteeing cleanness of water channel of cylinder body of evanescent mode casting dry type internal combustion engine |
| CN104226905B (en) * | 2014-09-01 | 2016-07-06 | 山西模范机械制造有限公司 | The technique ensureing lost foam casting dry type internal combustion engine cylinders water channel cleaning |
| CN104226907A (en) * | 2014-09-30 | 2014-12-24 | 无锡康柏斯机械科技有限公司 | Lost foam casting process capable of compacting sand further |
| CN107470551A (en) * | 2017-08-26 | 2017-12-15 | 上海魁殊自动化科技有限公司 | A kind of mold wash and its compound method |
| CN107470551B (en) * | 2017-08-26 | 2019-04-30 | 唐山市鸿泉矿山机械有限公司 | A kind of mold wash and its preparation method |
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| CN102873263B (en) | 2014-09-17 |
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Address after: 215431 Jiangsu city of Suzhou province Taicang City Liuhe Town Liu Village Patentee after: Suzhou Cobol Machine Tool Group Co., Ltd. Address before: 215431 Jiangsu city of Suzhou province Taicang Liuhe Liu Hutai Road No. 89 New Village Patentee before: Taicang Keboer Precision Casting Co., Ltd. |