CN103990764B - A kind of casting sand core mending paste and preparation method thereof - Google Patents
A kind of casting sand core mending paste and preparation method thereof Download PDFInfo
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- CN103990764B CN103990764B CN201410212670.XA CN201410212670A CN103990764B CN 103990764 B CN103990764 B CN 103990764B CN 201410212670 A CN201410212670 A CN 201410212670A CN 103990764 B CN103990764 B CN 103990764B
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Abstract
A kind of casting sand core mending paste and preparation method thereof, weight percent consists of: washed-out sand 65%-70%; Fine sand 8%-10%; Pre-gelatinized starch 3%-5%; Sodium bentonite 2%-3%; Cellulose 0.2%-0.5%; AEO 0.1%-0.5%; Surplus is water.Step is: with cellulose and water preparation cellulose suspension; Prepare sodium bentonite solution with sodium bentonite and water, add cellulose suspension, the outstanding miscible fluid of preparation; In high-speed stirred still, drop into the outstanding miscible fluid of preparation, water and pre-gelatinized starch stir, then in high-speed stirred still, drop into fine sand, washed-out sand and AEO stir, obtain casting sand core mending paste.Advantage is: preparation process is simple, and raw material is easy to get, gas forming amount is low, and reduce pore and produce, mending paste is synchronous with core defeated and dispersed, and foundry goods is easily cleared up, and prevents scab.
Description
Technical field
The present invention relates to a kind of casting sand core mending paste and preparation method thereof.
Background technology
Foundry production is generally divided into the links such as sand process, moulding, coremaking, oven dry, mould assembly, melting, cast, peeling.In actual production, about have the cast product of half to need coremaking, therefore coremaking is an important step in foundry technology process.Adopt core shooter coremaking to be a kind of high efficiency mechanization coremaking mode, it is that core sand is injected with high speed the core that core box obtains consolidation by power with compressed air.The ad-hoc location be fixed on after core makes in sand mo(u)ld is poured into a mould, and after having cast, core has been wrapped in foundry goods, breaks core into pieces, thus forms the chamber portion in foundry goods.
In coremaking process, due to tooling device precision, temperature control, there is gap, the core box exhaust reason such as not smooth in raw and auxiliary material and core box wearing and tearing, core box, often there is the defect such as out-of-flatness, misrun in the core surface of making, for ensureing cast product outward appearance precision and the dimensional requirement of production, need to use mending paste to repair the core of existing defects and the gap after smearing the combination of back-up sand core, to prevent the defects such as foundry goods produces " fleshiness " and fash is excessive, thus improve product quality, the rate of reducing the number of rejects and seconds of foundry goods.In casting process, after mending paste is subject to the heat effect of molten metal, the effects such as the moisture in mending paste, organic matter and some mineral generating gasification, so burning, distillation, decomposition, gas can be produced, portion gas can not all be overflowed in time, a part is stayed in hole, forms larger pressure, stops the infiltration of molten metal.If after low melting point remains in and cast(ing) surface will form sinter layer in mending paste product, if sinter layer and cast(ing) surface adhere to each other, chemical scab will be formed.
At present, the mending paste generally used mainly is divided into following several: one forms with the modulation of the raw material such as machine oil and bentonite; Owing to there being the machine oil of a large amount of aerogenesis containing raw material, its gas forming amount is large, and during cast, oil smoke is large, and after cast, foundry goods easily produces the defects such as pore.Another kind adopts scale graphite, adds binder making and form; Owing to taking scale graphite as the phenomenon that shelling, coming off, conduct electricity in use easily appears in raw material, thus after cast, foundry goods easily produces the casting flaw such as scab, pore, is not suitable for automation foundry production line.Also having a kind of is adopt silica flour, adds binding agent, suspending agent is formulated, easily adhere to each other with cast(ing) surface, be not easy defeated and dispersed after cast, causes the defects such as casting cleaning is difficult, generation scab.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of casting sand core mending paste and preparation method thereof, and preparation process is simple, and raw material is easy to get, gas forming amount is low, and reduce pore and produce, mending paste is synchronous with core defeated and dispersed, and foundry goods is easily cleared up, and prevents scab.
Technical solution of the present invention is:
A kind of casting sand core mending paste, is made up of following raw material according to percentage by weight:
Washed-out sand 65%-70%;
Fine sand 8%-10%;
Pre-gelatinized starch 3%-5%;
Sodium bentonite 2%-3%;
Cellulose 0.2%-0.5%;
AEO 0.1%-0.5%;
Water surplus.
Described casting sand core mending paste is according to the anticorrisive agent of percentage by weight also containing 0.05%-0.5%.
The granularity of described washed-out sand is 70-140 order, and the granularity of described fine sand is more than 200 orders, and the granularity of described washed-out sand is less than the granularity of the casting sand core raw sand of repairing.
A preparation method for casting sand core mending paste, its concrete steps are:
(1) be that 1:10 mixes and stirs by cellulose and water according to mass ratio, preparation cellulose suspension;
(2) sodium bentonite is mixed according to mass ratio 1:1 with water, stir and place 24h, preparation sodium bentonite cream, drop in high-speed stirred still, add the water accounting for sodium bentonite gross mass 3 times-5 times to stir, obtain sodium bentonite solution, add the cellulose suspension that step (1) is prepared, mix, obtain sodium bentonite cellulose and hang miscible fluid;
(3) in high-speed stirred still, drop into outstanding miscible fluid, water and the pre-gelatinized starch that step (2) prepares stir, then in high-speed stirred still, drop into fine sand, washed-out sand and AEO stir, obtain casting sand core mending paste.
Step (3) drops into fine sand, washed-out sand and AEO in high-speed stirred still, can also drop into anticorrisive agent simultaneously.
Beneficial effect of the present invention:
(1) raw material environment-protecting asepsis, in formula, washed-out sand and fine sand make the plasticity of mending paste strong as fire resistant infilling, and realize synchronous with core defeated and dispersed, and sinter layer is easy to strip down from cast(ing) surface, effectively prevents chemical scab; Using sodium bentonite and cellulose as suspending agent compound use, mending paste is not in use seeped water, is easy to smear; And washed-out sand, fine sand and cellulose with the use of, also there is excellent crack resistance; Adopt pre-gelatinized starch as binding agent, effectively can improve the intensity of cast core mending paste; Adding AEO makes mending paste have fabulous adhesive force as diffuse agent, rapid osmotic core, fast drying, difficult drop-off.
(2) preparation process is simple, and raw material is easy to get, with low cost; Use procedure is nontoxic, do not ftracture in dry run, easy to operate, especially in hot box process process core without the need to cool to room temperature, can high-temperature operation, not bulge; After core has repaired placement room temperature, mending paste is indeformable, does not come off; Refractoriness is high, and gas forming amount is low, reduces pore and produces, realize synchronous with core defeated and dispersed, is convenient to casting falling sand cleaning.
Detailed description of the invention
Embodiment 1
(1) 0.2 kilogram of cellulose is dissolved completely in 2 kg of water stirs, preparation cellulose suspension;
(2) 2.2 kilograms of sodium bentonites are mixed with 2.2 kg of water, stir and place 24h, preparation sodium bentonite cream, drop in high-speed stirred still, add 10 kg of water to stir, obtain sodium bentonite solution, add the cellulose suspension that step (1) is prepared, mix, obtain sodium bentonite cellulose and hang miscible fluid;
(3) in high-speed stirred still, drop into outstanding miscible fluid, 5.1 kg of water and the 3 kilograms of pre-gelatinized starches that step (2) prepares stir, in high-speed stirred still, drop into the washed-out sand (fine sand) of more than 8.7 kilogram of 200 order, the washed-out sand of 66.45 kilograms of 70-140 objects, 0.1 kilogram of AEO and 0.05 kilogram of anticorrisive agent again stir, obtain casting sand core mending paste.
Embodiment 2
(1) 0.3 kilogram of cellulose is dissolved completely in 3 kg of water stirs, preparation cellulose suspension;
(2) 3 kilograms of sodium bentonites are mixed with 3 kg of water, stir and place 24h, preparation sodium bentonite cream, drop in high-speed stirred still, add 10 kg of water to stir, obtain sodium bentonite solution, add the cellulose suspension that step (1) is prepared, mix, obtain sodium bentonite cellulose and hang miscible fluid;
(3) in high-speed stirred still, drop into outstanding miscible fluid, 0.7 kg of water and the 4 kilograms of pre-gelatinized starches that step (2) prepares stir, in high-speed stirred still, drop into the washed-out sand (fine sand) of more than 10 kilogram of 200 order, the washed-out sand of 65 kilograms of 70-140 objects, 0.5 kilogram of AEO and 0.5 kilogram of anticorrisive agent again stir, obtain casting sand core mending paste.
Embodiment 3
(1) 0.5 kilogram of cellulose is dissolved completely in 5 kg of water stirs, preparation cellulose suspension;
(2) 2 kilograms of sodium bentonites are mixed with 2 kg of water, stir and place 24h, preparation sodium bentonite cream, drop in high-speed stirred still, add 7 kg of water to stir, obtain sodium bentonite solution, add the cellulose suspension that step (1) is prepared, mix, obtain sodium bentonite cellulose and hang miscible fluid;
(3) in high-speed stirred still, outstanding miscible fluid that step (2) prepares is dropped into and 5 kilograms of pre-gelatinized starches stir, in high-speed stirred still, drop into the washed-out sand (fine sand) of more than 8 kilogram of 200 order, the washed-out sand of 70 kilograms of 70-140 objects, 0.4 kilogram of AEO and 0.1 kilogram of anticorrisive agent again stir, obtain casting sand core mending paste.
Casting sand core mending paste in embodiment of the present invention 1-embodiment 3, in hot box process process without the need to cool to room temperature, repair with this casting sand core mending paste, do not ftracture in dry run, gas forming amount is low, gas forming amount (850 DEG C) < 20mL/g, reduce pore to produce, not bulge; After core has repaired placement room temperature, mending paste is indeformable, does not come off; Refractoriness is high, realizes synchronous with core defeated and dispersed, is convenient to casting falling sand cleaning.
Claims (5)
1. a casting sand core mending paste, is characterized in that: be made up of following raw material according to percentage by weight:
Washed-out sand 65%-70%;
Fine sand 8%-10%;
Pre-gelatinized starch 3%-5%;
Sodium bentonite 2%-3%;
Cellulose 0.2%-0.5%;
AEO 0.1%-0.5%;
Water surplus.
2. casting sand core mending paste according to claim 1, is characterized in that: described casting sand core mending paste is according to the anticorrisive agent of percentage by weight also containing 0.05%-0.5%.
3. casting sand core mending paste according to claim 1, is characterized in that: the granularity of described washed-out sand is 70-140 order, and the granularity of described fine sand is more than 200 orders, and the granularity of described washed-out sand is less than the granularity of the casting sand core raw sand of repairing.
4. the preparation method of a kind of casting sand core mending paste as claimed in claim 1, is characterized in that: concrete steps are:
(1) be that 1:10 mixes and stirs by cellulose and water according to mass ratio, preparation cellulose suspension;
(2) sodium bentonite is mixed according to mass ratio 1:1 with water, stir and place 24h, preparation sodium bentonite cream, drop in high-speed stirred still, add the water accounting for sodium bentonite gross mass 3 times-5 times to stir, obtain sodium bentonite solution, add the cellulose suspension that step (1) is prepared, mix, obtain sodium bentonite cellulose and hang miscible fluid;
(3) in high-speed stirred still, drop into outstanding miscible fluid, water and the pre-gelatinized starch that step (2) prepares stir, then in high-speed stirred still, drop into fine sand, washed-out sand and AEO stir, obtain casting sand core mending paste.
5. the preparation method of a kind of casting sand core mending paste according to claim 4, is characterized in that: step (3) drops into fine sand, washed-out sand and AEO in high-speed stirred still, also drops into anticorrisive agent simultaneously.
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| CN201410212670.XA CN103990764B (en) | 2014-05-20 | 2014-05-20 | A kind of casting sand core mending paste and preparation method thereof |
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| CN103990764B true CN103990764B (en) | 2016-03-30 |
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| CN104289663B (en) * | 2014-10-08 | 2016-08-24 | 吴江市液铸液压件铸造有限公司 | A kind of high temperature resistant repair paint |
| CN104525848B (en) * | 2015-01-05 | 2017-03-15 | 重庆长江造型材料（集团）股份有限公司 | A kind of casting chaplet box sand mold or the hot sticky glue of core |
| CN104942276B (en) * | 2015-06-02 | 2017-11-24 | 遵义金业机械铸造有限公司 | A kind of casting gap method for repairing and mending |
| CN107598092A (en) * | 2017-09-29 | 2018-01-19 | 湖北荆安汽车零部件有限公司 | It is a kind of to be used to make core of wheel hub and preparation method thereof |
| CN108160928A (en) * | 2018-01-02 | 2018-06-15 | 湖南精量重工科技有限公司 | A kind of resin sand core manufacturing craft |
| CN108555225A (en) * | 2018-04-24 | 2018-09-21 | 常州思宇知识产权运营有限公司 | A kind of environmentally-friendly water-based sand core repairing sand |
| CN109014062A (en) * | 2018-09-29 | 2018-12-18 | 西峡县众德汽车部件有限公司 | Sand core mending paste and preparation method thereof and sand core |
| CN112658200B (en) * | 2020-12-11 | 2022-09-23 | 盐城仁创砂业科技有限公司 | Repair paste for resin coated sand core and preparation method |
| CN112775391A (en) * | 2020-12-24 | 2021-05-11 | 天津宁康科技有限公司 | Low-gas-evolution high-strength quick-drying type repairing paste for furan resin sand and preparation method thereof |
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| US4674553A (en) * | 1986-07-07 | 1987-06-23 | Witt Raymond H | Method for sand casting varying thickness articles |
| CN1607051A (en) * | 2003-10-15 | 2005-04-20 | 联合工艺公司 | Refractory metal core coating |
| CN1785883A (en) * | 2005-12-09 | 2006-06-14 | 长安汽车（集团）有限责任公司 | Film covered sand core fast drying repair paste |
| CN102310159A (en) * | 2010-12-11 | 2012-01-11 | 中国一拖集团有限公司 | Water-based powder-type dip-coating coating for cast iron cold-box core |
| CN102688980A (en) * | 2012-06-15 | 2012-09-26 | 河海大学常州校区 | Environment-friendly casting molding sand and preparation method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4674553A (en) * | 1986-07-07 | 1987-06-23 | Witt Raymond H | Method for sand casting varying thickness articles |
| CN1607051A (en) * | 2003-10-15 | 2005-04-20 | 联合工艺公司 | Refractory metal core coating |
| CN1785883A (en) * | 2005-12-09 | 2006-06-14 | 长安汽车（集团）有限责任公司 | Film covered sand core fast drying repair paste |
| CN102310159A (en) * | 2010-12-11 | 2012-01-11 | 中国一拖集团有限公司 | Water-based powder-type dip-coating coating for cast iron cold-box core |
| CN102688980A (en) * | 2012-06-15 | 2012-09-26 | 河海大学常州校区 | Environment-friendly casting molding sand and preparation method thereof |
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