CN109794581A - A kind of lost foam paint suitable for the casting of continuous Thin-Section Steel Castings - Google Patents

A kind of lost foam paint suitable for the casting of continuous Thin-Section Steel Castings Download PDF

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Publication number
CN109794581A
CN109794581A CN201910226863.3A CN201910226863A CN109794581A CN 109794581 A CN109794581 A CN 109794581A CN 201910226863 A CN201910226863 A CN 201910226863A CN 109794581 A CN109794581 A CN 109794581A
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China
Prior art keywords
coating
parts
casting
lost foam
continuous thin
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Pending
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CN201910226863.3A
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Chinese (zh)
Inventor
王幸
何翔
高杰
杨建超
高伟亮
孙桂娟
赵强
张惠贤
王延密
王昱蘅
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Institute of Engineering Protection National Defense Engineering Research Institute Academy of Military Sciences of PLA
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Institute of Engineering Protection National Defense Engineering Research Institute Academy of Military Sciences of PLA
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Priority to CN201910226863.3A priority Critical patent/CN109794581A/en
Publication of CN109794581A publication Critical patent/CN109794581A/en
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Abstract

The present invention relates to a kind of lost foam paints suitable for the casting of continuous Thin-Section Steel Castings, be made of following mass component: 30 parts of zirconium English powder, 70 parts of bauxite, sodium bentonite is 2 parts~4 parts, sodium carboxymethylcellulose (CMC) is 0.5 part, 5 parts of silica solution, 0.3 part of polyvinyl butyral (PVB), 0.7 part of phenolic resin, alkyl phenol polyoxyethylene ether (OP10) is 0.1-0.5 part, n-butanol is 0.1-0.5 part, and formaldehyde is 0.1-0.5 part, and talcum powder is 2 parts;The water is 80~100 parts.The present invention is suitable for the casting of continuous Thin-Section Steel Castings, can reach using the continuous Thin-Section Steel Castings that the coating manufactures and fills that type is complete, round and smooth bright and clean, flawless the technical requirements in surface.

Description

A kind of lost foam paint suitable for the casting of continuous Thin-Section Steel Castings
Technical field
The present invention relates to foundry engieering, specifically a kind of lost foam paint suitable for the casting of continuous Thin-Section Steel Castings.
Background technique
The factors such as lost foam paint and evaporative pattern apperance, the pouring temperature of molten metal are three big crucial skills of lost foam casting One of art, the performance superiority and inferiority of lost foam paint directly influence the quality of casting.The use of lost foam paint is different from general casting Make coating.In conventional cast, for applying coating in casting mold mold cavity surface, but in lost foam casting, coating is coated in foam In plastics apperance.The main function of lost foam paint has the following: 1) humidification, and lost foam paint layer can improve foam plastic The strength and stiffness of material prevent apperance from destroying or deforming in transport, back-up sand vibration, and suitable coating can be improved the rigid of model Degree reduces deformation;2) buffer action, when casting, dope layer is spacer medium important between liquid metals and dry sand, dope layer Metal liquid and casting mold are separated, prevent metal liquid from penetrating into dry sand, to guarantee to obtain any surface finish, without the casting of scab, Meanwhile preventing dry sand from flowing into the gap of metal liquid and Foam Pattern, cause casting mold crush;3) discharge acts on, dope layer energy The product (a large amount of gas or liquid etc.) for allowing foamed plastics to thermally decompose, which is successfully arranged, to be escaped in casting mold, prevents casting from generating gas Hole, carbon black defect etc..Pouring temperature is different when due to casting different-alloy, and the decomposition product difference of foamed polystyrene pattern is very big, When being poured the ferrous metal such as steel, based on gaseous products, coating will have higher gas permeability.Dope layer in many cases, The intensity of decomposition product and dope layer is conflict, and this requires selected coating should be to the pyrolysis product of foamed plastics The adsorption capacity and venting capability having had, while requiring have high strength of coating, in addition also to have and be coated with processing performance well.
Gas permeability, suspension, strength of coating, viscosity are the basic performance indices of lost foam cast steel coating, wherein gas permeability The speed that foam melts and the product of decomposition escapes is directly controlled, to determine the flowing velocity of liquid metal, and then certainly The generation for the defects of having determined whether can to eliminate stomata, cold shut, having poured less than, carbon distribution.Currently, we are prefabricated a kind of for metal When with the metal cell of block stone composite material, domestic YQ steel moulder's paint is used, which is suitable for common steel-casting, But when being applied to the metal cell steel-casting of continuous thin-walled, metal cell occurs filling the defects of type is imperfect, and preliminary analysis is The casting technique requirement of continuous thin-wall part is not achieved in the gas permeability of coating;And it is domestic for being suitable for continuous Steel Thin-Wall cast casting Lost foam paint there is no suitable product.
Summary of the invention
Object of the present invention is to propose a kind of lost foam paint suitable for the casting of continuous Thin-Section Steel Castings, this coating is basis The basic principle of lost foam paint is developed by reasonable experimental design and a large number of experiments inspection institute, and coating intensity is high, resistance to High-temperature behavior is good, and gas permeability and suspension are good, is suitble to prepare the metal cell structure of continuous thin-walled.
1, to achieve the above object, the invention adopts the following technical scheme: a kind of be suitable for the casting of continuous Thin-Section Steel Castings Lost foam paint, it is a kind of suitable for continuous Thin-Section Steel Castings casting lost foam paint, it is characterized in that: by following mass component Constitute: zirconium English powder is 30 parts, and bauxite is 70 parts, and sodium bentonite is 2 parts~4 parts, and sodium carboxymethylcellulose is 0.5 part, silicon Colloidal sol is 5 parts, and polyvinyl butyral is 0.3 part, and phenolic resin is 0.7 part, and alkyl phenol polyoxyethylene ether is 0.1~0.5 part, N-butanol is 0.1~0.5 part, and formaldehyde is 0.1~0.5 part, and talcum powder is 2 parts, and water is 80~100 parts.
The granularity of the zirconium English powder and bauxite is 270~320 mesh.
The beneficial effects of the present invention are: a kind of lost foam paint proposed by the invention has preferable through experimental test Gas permeability, suspension and it is coated with performance, intensity is high after coating is dry, is particularly suitable for the casting of continuous Thin-Section Steel Castings, uses The continuous Thin-Section Steel Castings of coating manufacture, which can reach, fills that type is complete, round and smooth bright and clean, flawless the technical requirements in surface.
Specific embodiment
The present invention is described in further detail combined with specific embodiments below.
Embodiment:
The invention proposes a kind of lost foam paints suitable for the casting of continuous Thin-Section Steel Castings, are made of following mass component: 30 parts of zirconium English powder, 70 parts of bauxite, sodium bentonite is 2 parts~4 parts, and sodium carboxymethylcellulose (CMC) is 0.5 part, silica solution 5 Part, 0.3 part of polyvinyl butyral (PVB), 0.7 part of phenolic resin, alkyl phenol polyoxyethylene ether (OP10) is 0.1-0.5 part, N-butanol is 0.1-0.5 part, and formaldehyde is 0.1-0.5 part, and talcum powder is 2 parts;The water is 80~100 parts.
The granularity of the zirconium English powder and bauxite is 270~320 mesh.
Lost foam paint proposed by the invention, the quality proportioning of main component are obtained according to following procedure:
1) first according to theory analysis, determine that refractory aggregate is zirconium English powder and bauxite, wherein made by mechanical crushing zircon At zirconium English powder show as neutral or faintly acid at high temperature and be conducive to not with iron oxide chemically reactive in large-scale steel-casting On prevent scab defect, thus when producing large-scale steel-casting and important cast steel, ironcasting, usually use zirconium Ying Fenzuo refractory powder Material;The advantages of bauxite grog refractory is that thermal expansion amount is small, temperature be 20~1320 DEG C when thermal expansion coefficient be no more than 4.5 × 10-6, high volume is stable, and refractoriness is high, and resistance to slag is good, and iron and its oxi is low to its wellability, and because bauxite is being poured At a temperature of discord metal oxide generate low melting point, good anti-burnon can be played the role of by being accordingly used in coating.
In order to determine the optimal proportion in refractory aggregate between each component, tested three times, according to the proportion of table one Coating is prepared, and determines the various performances of three groups of coating.
The match ratio of the refractory aggregate of three groups of experiments is as shown in Table 1:
In three groups of experiments, the performance measure of coating is as shown in Table 2:
Table two:
It can be seen that in the identical situation of other components from test bit in table two, zirconium English powder and bauxite different proportion are matched There is a big difference for the performance of the coating of system.First, with the increase of bauxite additional amount, the intensity of coating is increased with it.First The coating maximum intensity of group.The second, the first group of gas permeability is apparently higher than other two groups, and the gas permeability of third group is minimum.Third, From the point of view of two groups of being coated with property, adhesion amount data, first group of being coated with property and adhesion amount is better than two groups latter.First group of gas permeability The requirement of lost foam cast steel coating is substantially conformed to intensity, but the indexs such as the being coated with property of coating, adhesion amount are also poor, it need to also be into One step, which is formulated it, to be studied, and to improve the performances such as being coated with property, adhesion amount, reaches the requirement of lost foam cast steel.Comprehensive Correlation Analysis primarily determines that the refractory aggregate proportion in first group of experiment is best aggregate ratio, that is, uses bauxite 70%, zirconium English powder 30%。
2) influence according to analysis of experiments sodium bentonite additional amount to coating property.
Sodium bentonite plays suspension stabilizer and room temperature and high-temperature agglomerant in coating, in order to determine that sodium base is swollen The reasonable additional amount for moistening soil has carried out five tests, and every time in test, silica solution and CMC additional amount are respectively 5% He 0.5%, influence of the sodium bentonite additional amount to coating property is as shown in Table 3:
Table three:
Analytic intensity sand weight it is found that sodium bentonite content from 1% increase to 2% when, the intensity of coating sharply subtracts from 671g It is small to arrive 450g.When the additional amount of sodium bentonite be 2%~4% when, the intensity of coating with the increase of sodium bentonite content and Reduce, but the range of decrease is little, meets the requirement of lost foam cast steel.If continuing growing the content of sodium bentonite, the intensity of coating after It is continuous to reduce, the effect that coating increases the intensity of apperance is not had, so sodium bentonite content is unsuitable excessively high.
Analysis viscosity of the coating it is found that sodium bentonite content from 1% increase to 4% when, the viscosity of coating is from 230mPa.s Increase to 350mPa.s, variation is little.When sodium bentonite content 4%~5%, the viscosity of coating be increased dramatically, and highest can Up to 500 mPa.s.
Suspension is analyzed it is found that when sodium bentonite content changes in 1%~2% range, the suspension of coating is with sodium The increase of base bentonite content and become larger;When sodium bentonite content is 2%~4%, the suspension variation of coating is little, base Originally it is maintained at 95% or so;When sodium bentonite content is 4%~5%, the suspension of coating is again with sodium bentonite content Increase and becomes larger.Coating requires suspension to be greater than 90%, just can guarantee the stability of coating in this way, so sodium bentonite content It selects more appropriate 2%~4%.
3) influence according to analysis of experiments sodium carboxymethylcellulose (CMC) additional amount to coating property.
Five tests have been carried out, the silica solution additional amount tested every time is 5%, and the additional amount of sodium bentonite is 3%, Influence of the CMC additional amount to coating property is as shown in Table 4:
Table four:
It is found that when the additional amount of CMC is 0.3%, the viscosity of coating is 1470mPa.s for impact analysis to viscosity of the coating, The viscosity of coating is excessive at this time, after apperance is dry, coating cracking.When the content of CMC changes in the range of 0.5%~1.1% When, the viscosity of coating reduces with the increase of CMC content.When the content of CMC is 0.5%, coating neither cracks nor drips It drops down, the coating of lost foam cast steel required thickness can be formed in apperance, so the content selection 0.5% of CMC is proper.
Impact analysis to coating adhesion amount is it is found that when the content of CMC changes in the range of 0.3%~1.1%, coating Adhesion amount reduce with the increase of CMC content;The adhesion amount and viscosity of coating have close relationship, and viscosity is bigger, attached Amount it is bigger;CMC content is at 0.3%, and since viscosity is excessive, coating adhesion amount is excessive, leads to overweight coating, and gas permeability subtracts It is small, and coating is uneven.So the content selection 0.5% of CMC, meets the requirement of lost foam cast steel at this time.
To the analysis of the intensity effect of coating it is found that when the content of CMC changes in the range of 0.3%~0.7%, coating Intensity reduces with the increase of CMC content;When CMC content is about 0.8%, the intensity of coating reaches a minimum, Later with the increase of CMC content, the intensity of coating is gradually increased.When the content of CMC is 0.5%, strength of coating is simultaneously Non- maximum value, but modest viscosity at this time, coating do not crack not drip, and intensity is also able to satisfy the requirement of lost foam cast steel.
It to sum up analyzes, the viscosity of coating is excessive, leads to coating cracking.With the increase of CMC content, coating show compared with Good being coated with property, and it is flawless, but the additional amount of CMC can excessively make coating generate serious trickling phenomenon in coating, from And cause the intensity of coating inadequate.So the selection of CMC content is 0.5% or so.
4) influence according to analysis of experiments silica solution additional amount to coating property.
Bubbles model resists the impact of loose sand or shot to apperance when burying case, it is desirable that coating has after room temperature baking Enough intensity, and at high temperature, the gas generated when not hindering evaporative pattern to gasify escapes, for this purpose, silica solution is selected to do high temperature Binder, low temperature bonding agent of the CMC as coating.When CMC additional amount 0.5%, when sodium bentonite additional amount is 3%, into Five groups of tests gone to study influence of the silica solution additional amount to coating property, test result is as shown in Table 5:
Table five:
Impact analysis to viscosity of the coating is it is found that when the content of silica solution changes in the range of 2%~4%, as silica solution contains The viscosity of the increase of amount, coating is gradually reduced, and when silica solution content reaches 4%, viscosity reaches minimum value 350mPa.s, this When viscosity meet the requirement of lost foam cast steel, later with the increase of silica solution content, the viscosity of coating increases.
The intensity effect of coating is analyzed it is found that the intensity of coating is when the content of silica solution in coating is 2% 232g meets the requirement of lost foam cast steel coating, and intensity is increased with the increase of silica solution content, so silica solution content As long as being greater than 2% can satisfy requirement.When silica solution content increases to 5% from 3%, the intensity stabilization of coating, silica solution Content from 5% increase to 6% when, the intensity of coating sharply increases.So selecting silica solution content 3%~5% is best.
It to sum up analyzes, when silica solution content is 2% and 6%, the viscosity of coating is larger, and aluminium sheet sample of coating is split The being coated with property of line, coating is poor.When silica solution content is between 3%~5%, intensity stabilization, intensity and viscosity are able to satisfy disappearance The requirement of moulded steel, so the selection of silica solution content is between 3%~5%.
According to the above analysis of experiments, lost foam paint proposed by the invention has optimal processing performance, and performance is surveyed Examination is as shown in Table 6:
Table six:
Continuous thin-walled cast steel can sufficiently be met using lost foam paint proposed by the invention by actual casting production testing The technical requirements of part casting.
Part not in the detailed description of the invention is the prior art.

Claims (2)

1. a kind of lost foam paint suitable for the casting of continuous Thin-Section Steel Castings, it is characterized in that: being made of following mass component: zirconium 30 parts of Ying Fenwei, bauxite is 70 parts, and sodium bentonite is 2 parts~4 parts, and sodium carboxymethylcellulose is 0.5 part, silica solution 5 Part, polyvinyl butyral is 0.3 part, and phenolic resin is 0.7 part, and alkyl phenol polyoxyethylene ether is 0.1~0.5 part, n-butanol It is 0.1~0.5 part, formaldehyde is 0.1~0.5 part, and talcum powder is 2 parts, and water is 80~100 parts.
2. a kind of lost foam paint suitable for the casting of continuous Thin-Section Steel Castings according to claim 1, it is characterized in that: institute The granularity of the zirconium English powder and bauxite stated is 270~320 mesh.
CN201910226863.3A 2019-03-25 2019-03-25 A kind of lost foam paint suitable for the casting of continuous Thin-Section Steel Castings Pending CN109794581A (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1053200A (en) * 1990-10-24 1991-07-24 湖南省电力机械厂 Magnesite cast steel coating
JP2010105022A (en) * 2008-10-30 2010-05-13 Castem Engineering:Kk Surface-modified steel and precision casting method for casting having modified surface
CN103042168A (en) * 2012-12-30 2013-04-17 安岳县金龙机械制造有限公司 Lost foam casting coating and preparation method thereof
CN103357813A (en) * 2013-07-24 2013-10-23 翼城县福旺铸造实业有限公司 Lost foam steel-casting paint formula and technology method thereof
CN104353781A (en) * 2014-10-27 2015-02-18 无锡乐华自动化科技有限公司 Lost foam casting process of low-alloy cast steel wheel for port machinery
CN104368747A (en) * 2014-10-31 2015-02-25 无锡阳工机械制造有限公司 Water-based paint for casting steel casting evanescent pattern
CN107030252A (en) * 2017-06-14 2017-08-11 安徽康瑞高科新材料技术工程有限公司 A kind of cast steel evaporative pattern surface coating material
CN107971453A (en) * 2017-12-03 2018-05-01 江苏长友特钢机械有限公司 Lost foam paint of heat resisting steel and preparation method thereof
CN108788001A (en) * 2018-08-27 2018-11-13 河北冀凯铸业有限公司 A kind of large size alloy cast steel part evaporative pattern water based paint

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1053200A (en) * 1990-10-24 1991-07-24 湖南省电力机械厂 Magnesite cast steel coating
JP2010105022A (en) * 2008-10-30 2010-05-13 Castem Engineering:Kk Surface-modified steel and precision casting method for casting having modified surface
CN103042168A (en) * 2012-12-30 2013-04-17 安岳县金龙机械制造有限公司 Lost foam casting coating and preparation method thereof
CN103357813A (en) * 2013-07-24 2013-10-23 翼城县福旺铸造实业有限公司 Lost foam steel-casting paint formula and technology method thereof
CN104353781A (en) * 2014-10-27 2015-02-18 无锡乐华自动化科技有限公司 Lost foam casting process of low-alloy cast steel wheel for port machinery
CN104368747A (en) * 2014-10-31 2015-02-25 无锡阳工机械制造有限公司 Water-based paint for casting steel casting evanescent pattern
CN107030252A (en) * 2017-06-14 2017-08-11 安徽康瑞高科新材料技术工程有限公司 A kind of cast steel evaporative pattern surface coating material
CN107971453A (en) * 2017-12-03 2018-05-01 江苏长友特钢机械有限公司 Lost foam paint of heat resisting steel and preparation method thereof
CN108788001A (en) * 2018-08-27 2018-11-13 河北冀凯铸业有限公司 A kind of large size alloy cast steel part evaporative pattern water based paint

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