CN101376162A - Additive of green sand casting mould sand for preventing sand fusion and sand inclusion - Google Patents
Additive of green sand casting mould sand for preventing sand fusion and sand inclusion Download PDFInfo
- Publication number
- CN101376162A CN101376162A CNA2007100126230A CN200710012623A CN101376162A CN 101376162 A CN101376162 A CN 101376162A CN A2007100126230 A CNA2007100126230 A CN A2007100126230A CN 200710012623 A CN200710012623 A CN 200710012623A CN 101376162 A CN101376162 A CN 101376162A
- Authority
- CN
- China
- Prior art keywords
- sand
- scab
- burning
- molding sand
- additives
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
A green sand casting addition which prevents sand adhesion and sand inclusion is characterized in that the addition comprises one of the three following components or the combination thereof: polystyrene foam recycling products, furfural scraps and feldspar powder. The addition can easily produce castings with smooth and clean surfaces, and meet the requirements for producing various castings; the addition has the advantages of simple casting process, high production efficiency, low casting cost, high precision, etc.; the addition can better solve the technical problems of the green sand castings, such as the sand adhesion, the sand inclusion, the sand scabbing, etc.; the castings have the advantages of easier cleaning, high shape stability and more beautiful appearance; and meanwhile, the addition further avoids various defects in using coal powder. Compared with the prior art, the addition has better technical effect and great foreseeable economic and social values.
Description
Technical field
The present invention relates to foundry engieering, a kind of anti-scab, anti-burning into sand green casting molding sand additives are provided especially.
Background technology
In casting industry, the foundry goods of production any surface finish is the target that founder author pursues always, particularly needn't process for some and directly the foundry goods of assembling is especially true the foundry goods that directly uses or the back of spraying paint.In order to satisfy the demand of producing different foundry goods, people have been developed numerous formative methods, and green casting is therein in occupation of outstanding status.It is simple that it has technology, the production efficiency height, and casting cost is low, the precision advantages of higher, thus obtained using widely.According to incompletely statistics, China's green-sand foundry goods accounts for 70% of the total annual production of foundry goods.
But in the prior art, mold cavity surface is not generally rinsed coating when producing foundry goods with green-sand; With dry type relatively, defective, especially thick-walled casting such as the wet type foundry goods easily produces scab and burning into sand, scab, scab is just more serious.Because scab has caused the technical problem that much needs to be resolved hurrily: the outward appearance of casting cleaning difficulty, the serviceability that worsens foundry goods, infringement foundry goods etc.
In order to prevent foundry goods scab, people have adopted various anti-scab measures.As: use thin facing sand, improve the casting mold degree of packing, in green-sand, add coal dust etc.Using thin facing sand and improve the influence that the casting mold degree of packing is subjected to various technological factors, is a kind of very effective anti-scab measure and add coal dust.It can not only prevent that foundry goods from producing the scab defective, improves the surface smoothness of foundry goods, and can prevent that foundry goods from producing expansion class defective, and minimizing type wall shift is moving, improves casting dimension stability.
Though coal dust is a kind of good molding sand additives, along with people to the in-depth of coal dust mechanism of action understanding and the enhancing of environmental consciousness, the many disadvantages of coal dust also displays gradually:
1) because the raw material of coal dust is industrial coal, and it is a kind of very important energy material in China, and to be used to process casting must be the high-quality raw coal with the feed coal of coal dust.Serious day by day along with energy crisis uses coal dust will be faced with trapped danger if continue in green-sand;
2) because the bright carbon production rate of coal dust is low, for thick-walled casting, can not play well anti-scab effect when the addition of coal dust is not enough, but greatly reduces the gas permeability of molding sand again when the addition of coal dust is big, this technical problem difficulty is excessive also to be difficult to solution at present;
3) the ashes residue that stays after burning of coal dust reduces the refractoriness of molding sand, and this has obviously increased the secondary penetration tendency of molding sand;
4) coal dust also is the pollution sources of environment simultaneously.
Therefore, people catch at anti-scab, the anti-burning into sand green casting molding sand additives that a kind of technique effect is better, can substitute the coal dust use.
Summary of the invention
The purpose of this invention is to provide a kind of anti-scab, anti-burning into sand green casting molding sand additives.
A kind of anti-scab of the present invention, anti-burning into sand green casting molding sand additives, it is characterized in that: it includes one of following three kinds of compositions or its combination: poly-basis is alkene foam recovery product, furfural dregs, feldspar powder.
In described anti-scab, the anti-burning into sand green casting molding sand additives, the weight percent content scope of three kinds of compositions is respectively as mentioned above: poly-basis is alkene foam recovery product: 50%～100%; Furfural dregs: 0～35%; Feldspar powder: 0～25%.A kind of preferred use proportioning of the content of described three kinds of compositions is: poly-basis is alkene foam recovery product: percentage by weight about 64%; Furfural dregs: percentage by weight about 24%; Feldspar powder: percentage by weight about 12%.
Among the present invention, when contain in described anti-scab, the anti-burning into sand green casting molding sand additives poly-this when alkene foam recovery product, furfural dregs, this thrin of feldspar powder or its combination, described three kinds of possible components have one of following feature or its combination:
The poly-basis physicochemical property of alkene foam recovery product is as follows: bright carbon content is 40%, volatile matter 98.4%, ash content 0.5%, gas forming amount 996ml/g, 3 grades of characteristics of char residue;
The physicochemical property of furfural dregs is as follows: bright carbon content is 4%, volatile matter 68.1%, ash content 9%, 3 grades of characteristics of char residue, pH value 6;
The chemical composition and the weight percent content of feldspar powder are as follows: SiO
2Be 62%～67%, Al
2O
3Be 17%～24%, K
2O+Na
2O 〉=12%, K
2O is 〉=8%, S≤0.04%, P≤0.04%.
Generally speaking, described anti-scab, anti-burning into sand green casting molding sand additives, it is characterized in that: described anti-scab, anti-burning into sand green casting molding sand additives have one of following feature or its combination: bright carbon content is 23.2%, volatile matter 89%, ash content 2.1%, gas forming amount 785ml/g, 3 grades of characteristics of char residue.
In the present invention and since poly-this alkene foam recovery product be to be processed into after a kind of junk recovery, the wide price of originating is honest and clean, and bright carbon production rate is 40%, is about 10 times of super sea coal.Therefore just alkene foam recovery product generate agent as bright carbon to the coal dust substitute to gather originally.But because its scope of getting angry narrower (370-460 ℃), and gas forming amount is bigger, uses it might make foundry goods produce the danger of invasive pore merely; So the coal dust substitute material has the scope of getting angry of having selected to enlarge it, contain the material furfural dregs of certain bright carbon again.
Because the coal dust substitute except having anti-scab function, also should have the function of anti-burning into sand.So when selecting the coal dust substitute material for use, selected to reduce the feldspar powder of molding sand thermal expansion simultaneously.
Having studied that above three kinds of substitute materials add respectively in the molding sand can (green compression strength, green tensile strength, gas permeability, flowability etc.) and the influence of high-temperature behavior (hot green tensile strength, quick-fried hot time and thermal stress) to the normal temperature type of molding sand, has determined the suitable addition window when three kinds of materials add separately.Adopting the method for three rank simplex design of centre of gravity then, is that index has been determined that three kinds of materials are united and added fashionable optimal addn with the quick-fried hot time of bright carbon exponential sum: promptly poly-these alkene foam recovery product: percentage by weight about 64%; Furfural dregs: percentage by weight about 24%; Feldspar powder: percentage by weight about 12%.
In actual application, described anti-scab, anti-burning into sand green casting molding sand additives, the addition when adding in the molding sand is weight percentage 0.5%～2.5%.
Particularly:
For craft and common machines moulding, the addition when described anti-scab, anti-burning into sand green casting molding sand additives add in the molding sand is weight percentage 1.5%～1.7%;
Dash and high pressure moulding for gas, only with poly-this alkene foam recovery product just can reach the purpose of preventing scab, its addition in molding sand is weight percentage 0.8%～1%.
Advantage of the present invention:
The foundry goods of any surface finish can be produced at an easy rate, the demand of producing different foundry goods can be satisfied; Formative technology is simple, the production efficiency height, and casting cost is low; Precision is high to solve scab, the burning into sand of wet type foundry goods, technical problem such as scab preferably, and casting cleaning is more prone to, the serviceability of foundry goods can better be guaranteed, the foundry goods shape stability is good, and outward appearance is more attractive in appearance; Also avoided using the many disadvantages of coal dust simultaneously.Relatively and prior art, its technique effect better has foreseeable huge economy and social value.
Description of drawings
The present invention is further detailed explanation below in conjunction with drawings and the embodiments:
Fig. 1 is for using foundry goods photo in kind.
The specific embodiment
Embodiment 1
A kind of anti-scab, anti-burning into sand green casting molding sand additives, at first will gather during preparation this alkene foam about 150 degrees centigrade, be molten into liquid, then the cooling be ground into fritter, again with the fritter pulverize, by 100 mesh sieves; Or the poly-basis that will recycle alkene pulverize, by 100 mesh sieves.
Oven dry was levigate when the furfural ground-slag prepared, and crossed 100 mesh sieves.
A kind of anti-scab of present embodiment, anti-burning into sand green casting molding sand additives, it is characterized in that: it includes following three kinds of compositions: poly-basis is alkene foam recovery product, furfural dregs, feldspar powder.
A kind of preferred use proportioning of the content of described three kinds of compositions is: poly-basis is alkene foam recovery product: percentage by weight about 64%; Furfural dregs: percentage by weight about 24%; Feldspar powder: percentage by weight about 12%.
Above-described three kinds of components have one of following feature or its combination in anti-scab, the anti-burning into sand green casting molding sand additives:
The poly-basis physicochemical property of alkene foam recovery product is as follows: bright carbon content is 40%, volatile matter 98.4%, ash content 0.5%, gas forming amount 996ml/g, 3 grades of characteristics of char residue;
The physicochemical property of furfural dregs is as follows: bright carbon content is 4%, volatile matter 68.1%, ash content 9%, 3 grades of characteristics of char residue, pH value 6;
The chemical composition and the weight percent content of feldspar powder are as follows: SiO
2Be 62%～67%, Al
2O
3Be 17%～24%, K
2O+Na
2O 〉=12%, K
2O is 〉=8%, S≤0.04%, P≤0.04%.
Generally speaking, described anti-scab, anti-burning into sand green casting molding sand additives, it is characterized in that: described anti-scab, anti-burning into sand green casting molding sand additives have one of following feature or its combination: bright carbon content is 23.2%, volatile matter 89%, ash content 2.1%, gas forming amount 785ml/g, 3 grades of characteristics of char residue.
Described anti-scab, anti-burning into sand green casting molding sand additives are in actual application, for craft and common machines moulding, the addition when described anti-scab, anti-burning into sand green casting molding sand additives add in the molding sand is weight percentage 1.5%～1.7%;
Casting experimental sample in the present embodiment is diameter 80mm, high 66mm's is cylindrical, uniform thereon 6 diameter 52mm, the concave cylindrical of high 30mm hole. the difference of the surface quality of continuous castings of casting for relatively coal dust and substitute material, six fuses all adopt coal dust substitute molding sand during moulding, remainder adopts the coal dust sand of foundry, experimental result is as shown in Figure 1. and cheat inherent shake out afterwards with the slightly firmly stirring of a small wooden with six fuses that the coal dust substitute is watered, the molding sand in the hole exposes bright and clean surface with regard to all hanging down.But with other parts of foundry goods that factory's coal dust sand is poured into a mould wipe off behind the top floating sand with the iron brush firmly also brush do not fall the viscosity sand layer on surface.
Embodiment 2
A kind of anti-scab, anti-burning into sand green casting molding sand additives, at first will gather during preparation this alkene foam about 150 degrees centigrade, be molten into liquid, then the cooling be ground into fritter, again with the fritter pulverize, by 100 mesh sieves; Or the poly-basis that will recycle alkene pulverize, by 100 mesh sieves.
A kind of anti-scab of present embodiment, anti-burning into sand green casting molding sand additives, it is characterized in that: it includes and gathers this alkene foam recovery product, the described poly-basis physicochemical property of alkene foam recovery product is as follows: bright carbon content is 40%, volatile matter 98.4%, ash content 0.5%, gas forming amount 996ml/g, 3 grades of characteristics of char residue;
Described anti-scab, anti-burning into sand green casting molding sand additives are in actual application, dash and high pressure moulding for gas, only alkene foam recovery product just can reach the purpose of preventing scab with gathering originally, and its addition in molding sand is weight percentage 0.8%～1%.
Embodiment 3
Present embodiment and embodiment 1 content are basic identical, and its difference mainly is:
A kind of anti-scab, anti-burning into sand green casting molding sand additives, the weight percent content scope of described three kinds of compositions is respectively: poly-basis is alkene foam recovery product: 50%～100%; Furfural dregs: 0～35%; Feldspar powder: 0～25%.
Embodiment 4
Present embodiment and embodiment 1 content are basic identical, and its difference mainly is:
A kind of anti-scab, anti-burning into sand green casting molding sand additives, the weight percent content scope of described three kinds of compositions is respectively: poly-basis is alkene foam recovery product: 50%; Furfural dregs: 35%; Feldspar powder: 15%.
Embodiment 5
Present embodiment and embodiment 1 content are basic identical, and its difference mainly is:
A kind of anti-scab, anti-burning into sand green casting molding sand additives, the weight percent content scope of described three kinds of compositions is respectively: poly-basis is alkene foam recovery product: 50%; Furfural dregs: 25%; Feldspar powder: 25%.
Claims (8)
1, a kind of anti-scab, anti-burning into sand green casting molding sand additives, it is characterized in that: it includes one of following three kinds of compositions or its combination: poly-basis is alkene foam recovery product, furfural dregs, feldspar powder.
2, according to the described anti-scab of claim 1, anti-burning into sand green casting molding sand additives, it is characterized in that: the weight percent content scope of described three kinds of compositions is respectively: poly-basis is alkene foam recovery product: 50%～100%; Furfural dregs: 0～35%; Feldspar powder: 0～25%.
3, according to the described anti-scab of claim 2, anti-burning into sand green casting molding sand additives, it is characterized in that: the weight percent content of described three kinds of compositions is respectively: poly-basis is alkene foam recovery product: 64%; Furfural dregs: 24%; Feldspar powder: 12%.
4, according to one of them described anti-scab of claim 1～3, anti-burning into sand green casting molding sand additives, it is characterized in that: when contain in described anti-scab, the anti-burning into sand green casting molding sand additives poly-this when alkene foam recovery product, furfural dregs, this thrin of feldspar powder or its combination, described three kinds of possible components have one of following feature or its combination:
The poly-basis physicochemical property of alkene foam recovery product is as follows: bright carbon content is 40%, volatile matter 98.4%, ash content 0.5%, gas forming amount 996ml/g, 3 grades of characteristics of char residue;
The physicochemical property of furfural dregs is as follows: bright carbon content is 4%, volatile matter 68.1%, ash content 9%, 3 grades of characteristics of char residue, pH value 6;
The chemical composition and the weight percent content of feldspar powder are as follows: SiO
2Be 62%～67%, Al
2O
3Be 17%～24%, K
2O+Na
2O 〉=12%, K
2O is 〉=8%, S≤0.04%, P≤0.04%.
5, according to the described anti-scab of claim 1, anti-burning into sand green casting molding sand additives, it is characterized in that: described anti-scab, anti-burning into sand green casting molding sand additives have one of following feature or its combination:
The light carbon content is 23.2%, volatile matter 89%, ash content 2.1%, gas forming amount 785ml/g, 3 grades of characteristics of char residue.
6, according to the described anti-scab of claim 4, anti-burning into sand green casting molding sand additives, it is characterized in that: the addition when described anti-scab, anti-burning into sand green casting molding sand additives add in the molding sand is weight percentage 0.5%～2.5%.
7, according to the described anti-scab of claim 6, anti-burning into sand green casting molding sand additives, it is characterized in that:
For craft and common machines moulding, the addition when described anti-scab, anti-burning into sand green casting molding sand additives add in the molding sand is weight percentage 1.5%～1.7%.
8, according to the described anti-scab of claim 6, anti-burning into sand green casting molding sand additives, it is characterized in that:
Dash and high pressure moulding for gas, only with poly-this alkene foam recovery product just can reach the purpose of preventing scab, its addition in molding sand is weight percentage 0.8%～1%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100126230A CN101376162A (en) | 2007-08-29 | 2007-08-29 | Additive of green sand casting mould sand for preventing sand fusion and sand inclusion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100126230A CN101376162A (en) | 2007-08-29 | 2007-08-29 | Additive of green sand casting mould sand for preventing sand fusion and sand inclusion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101376162A true CN101376162A (en) | 2009-03-04 |
Family
ID=40419990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100126230A Pending CN101376162A (en) | 2007-08-29 | 2007-08-29 | Additive of green sand casting mould sand for preventing sand fusion and sand inclusion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101376162A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101733361A (en) * | 2010-01-06 | 2010-06-16 | 东华大学 | Sand burning preventing coal dust free green sand for casting and preparation method thereof |
| CN103056285A (en) * | 2013-01-29 | 2013-04-24 | 东华大学 | Sodium silicate silica sand anti-sticking additive for cast steel and application method of additive |
| CN104646594A (en) * | 2015-01-22 | 2015-05-27 | 安徽省繁昌县皖南阀门铸造有限公司 | Molding sand for machine molding and preparation method thereof |
| CN108405793A (en) * | 2018-05-03 | 2018-08-17 | 云南衡纬科技有限公司 | Moulding sand additive suitable for ironcasting |
| CN109158527A (en) * | 2018-10-31 | 2019-01-08 | 谷函（杭州）新材料科技有限公司 | A kind of no coal environmental protection casting sand additive and its purposes in molding sand |
| CN115069968A (en) * | 2021-03-10 | 2022-09-20 | 西南科技大学 | Casting green sand, environment-friendly carbonaceous additive and preparation process thereof |
-
2007
- 2007-08-29 CN CNA2007100126230A patent/CN101376162A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101733361A (en) * | 2010-01-06 | 2010-06-16 | 东华大学 | Sand burning preventing coal dust free green sand for casting and preparation method thereof |
| CN101733361B (en) * | 2010-01-06 | 2016-01-20 | 东华大学 | Casting coal dust free green-sand and preparation method thereof of Sand sticking-resistant |
| CN103056285A (en) * | 2013-01-29 | 2013-04-24 | 东华大学 | Sodium silicate silica sand anti-sticking additive for cast steel and application method of additive |
| CN104646594A (en) * | 2015-01-22 | 2015-05-27 | 安徽省繁昌县皖南阀门铸造有限公司 | Molding sand for machine molding and preparation method thereof |
| CN108405793A (en) * | 2018-05-03 | 2018-08-17 | 云南衡纬科技有限公司 | Moulding sand additive suitable for ironcasting |
| CN109158527A (en) * | 2018-10-31 | 2019-01-08 | 谷函（杭州）新材料科技有限公司 | A kind of no coal environmental protection casting sand additive and its purposes in molding sand |
| CN109158527B (en) * | 2018-10-31 | 2021-08-10 | 谷函（杭州）新材料科技有限公司 | Coal-free environment-friendly foundry molding sand additive and application thereof in molding sand |
| CN115069968A (en) * | 2021-03-10 | 2022-09-20 | 西南科技大学 | Casting green sand, environment-friendly carbonaceous additive and preparation process thereof |
| CN115069968B (en) * | 2021-03-10 | 2023-05-23 | 西南科技大学 | Green casting sand, environment-friendly carbonaceous additive and preparation process thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101376162A (en) | Additive of green sand casting mould sand for preventing sand fusion and sand inclusion | |
| CN102407275B (en) | Expendable pattern casting (EPC) molding shell paint for casting steel and preparation method thereof | |
| CN102407279B (en) | Method for preparing water-based coating for sand mold casting | |
| CN102397983A (en) | Full mold casing coating | |
| CN102836952A (en) | Resin sand type casting coating and preparation method thereof | |
| CN102248120B (en) | Low thermoconductive paint for casting lost foam of thin wall cast | |
| CN103100651A (en) | Method for preparing solid-mold casting coating material for large-sized cast parts | |
| CN104117626A (en) | Zircon powder alcohol-based casting coating and preparing method thereof | |
| CN108380815B (en) | Lost foam casting hardening hollow shell coating and preparation method thereof | |
| CN103990764B (en) | A kind of casting sand core mending paste and preparation method thereof | |
| CN101934350B (en) | Wet precoated sand | |
| CN101480698A (en) | Non-carburized casting method for lost foam | |
| CN104193203B (en) | Geopolymer prepared by employing Liling ceramic waste material and its preparation method and application | |
| CN103100657A (en) | Method for preparing high-wear-resistance solid-mold casting coating material | |
| CN104014719A (en) | High-performance alcohol-base casting paint and production method thereof | |
| CN106588077A (en) | Lightweight high-strength fly ash aerated concrete building block and preparation method thereof | |
| CN109970346A (en) | It is a kind of for the flash glaze of glass Mosaic and the preparation process of glass Mosaic | |
| CN105081206A (en) | Coating for lost foam iron casting | |
| CN102397982A (en) | Sand casting water-based coating | |
| CN101934348B (en) | Surface sand for precise casting and preparation thereof | |
| CN106424574A (en) | Cast steel exothermic riser sleeve | |
| CN105537526A (en) | Forming method of flame-retarding insulating riser | |
| CN103008534A (en) | Novel heat insulation multilayer coating for common medium carbon steel casting in metal casting production | |
| CN205519502U (en) | Zirconium corundum does not have exothermic riser casting sand mo(u)ld of shrinkage cavity brick | |
| CN104353789A (en) | Preparation method of sand casting sand core and prepared sand core |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20090304 |