CN107252872A - One kind heating precoated sand and preparation method thereof - Google Patents
One kind heating precoated sand and preparation method thereof Download PDFInfo
- Publication number
- CN107252872A CN107252872A CN201710352728.4A CN201710352728A CN107252872A CN 107252872 A CN107252872 A CN 107252872A CN 201710352728 A CN201710352728 A CN 201710352728A CN 107252872 A CN107252872 A CN 107252872A
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- preparation
- sand
- mixed grind
- exothermic mixture
- precoated sand
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
Abstract
The invention discloses one kind heating precoated sand and preparation method thereof, the preparation method of the heating precoated sand of the present invention, it is characterized in that, powdery exothermic mixture is preheated, silica sand is heated to 105 140 DEG C, by them after puddle mixer mixed grind is uniform, adds after the 80S of resin mixed grind 70, the 50S of methenamine aqueous solution mixed grind 30 is added, adds and sand shaping is put after the 100S of calcium stearate mixed grind 70.Heating precoated sand moderate strength produced by the present invention, especially gas forming amount is excellent, it is possible to use heating precoated sand of the invention makes different product, easy changes shape after product is moulded, ease of assembly, good with supporting cast product matching.
Description
Technical field
Field is manufactured the present invention relates to chemical industry, and in particular to one kind heating precoated sand and preparation method thereof.
Background technology
Precoated sand refers to the abbreviation for being coated with one layer of resin film sand grains, and it is a kind of casting and molding（Core）With material, its shape
State is generally the scattered natural particle shape of dry state at room temperature.In broad terms, precoated sand is also a kind of resin sand.Existing heating is covered
Film sand, gas forming amount is not abundant enough during as core, it is impossible to improves casting rising head premature solidification in casting process and binds appearance
Bleb and shrinkage defect.
The content of the invention
For defect present in above-mentioned prior art, the present invention provides a kind of heating precoated sand and preparation method thereof.This
The heating precoated sand gas forming amount of invention is excellent, can generate heat, and improves local pyrexia in casting casting cycle and acts on, can be fabricated to
Variously-shaped core, places it in and fills the position that iron liquid after type locally needs to delay to cool down, solve rising head premature solidification
Bind the bleb and shrinkage defect of appearance.
Specifically, the present invention provides a kind of preparation method for the precoated sand that generates heat, and it preheats powdery exothermic mixture, silica sand heating
To 105-140 DEG C, by them after puddle mixer mixed grind is uniform, add after resin mixed grind 70-80S, add the methenamine aqueous solution
Mixed grind 30-50S, adds and sand shaping is put after calcium stearate mixed grind 70-100S.
In addition, the preparation method of the present invention preferably preheats powdery exothermic mixture, silica sand is heated to 130 DEG C, by them mixed
After sand machine mixed grind is uniform, add after resin mixed grind 75S, add methenamine aqueous solution mixed grind 40S, add calcium stearate mixed grind
Sand shaping is put after 90S.
In addition, the weight ratio of the exothermic mixture and the silica sand is 55-50:45-50.Further, the silica sand with it is described
The weight ratio preferably 53 of exothermic mixture:47.
In addition, the exothermic mixture is efficient exothermic shield YG-ZB.
In addition, the resin is phenolic resin, it is exothermic mixture and the 1-3% of silica sand total amount.
In addition, the methenamine is exothermic mixture and the 0.5-1.3% of silica sand total amount.Further, the methenamine is water-soluble
Liquid is mixed by the methenamine and the water of 2 parts by weight of 1 parts by weight.
In addition, the calcium stearate is exothermic mixture and the 0.15-0.2% of silica sand gross weight.
In addition, the preparation method in the present invention, is closed using day and contains FS1612-SM type coated sand mixers, rotor speed
65r/min。
The present invention also provides a kind of preparation method as described above obtained heating precoated sand.
The heating precoated sand caloric value of the present invention is excellent, locally needs to generate heat or slow down the portion of cooling used in the rising head of casting
Position, makes the casting of complexity be sufficiently vented and riser feeding in casting process.And the heating precoated sand intensity of the present invention is fitted
In, it is possible to use the invention makes different product, product easy changes shape, ease of assembly, with supporting casting after moulding
Part product matching is good.
Embodiment
The present invention is described in detail with reference to embodiment, but the present invention is not limited to these embodiments.
The producer of each composition used and model etc. are as follows in the embodiment of the present invention：
Exothermic mixture：Efficient exothermic shield, producer：Sanmenxia Gorge sunlight Zhu Cai Co., Ltds, model：YG-ZB；
Silica sand：Luanchuan County Dong Wei Modeling Materials Co., Ltd, model：70/140；
Resin：The organic material resin of the rising sun（Nantong）Co., Ltd, model：NTS10G；
Methenamine：Luoyang Wei Lelan commerce and trade Co., Ltd；
Calcium stearate：Luoyang Wei Lelan commerce and trade Co., Ltd；
Puddle mixer：It, which is closed, contains FS1612-SM coated sand mixers；
Embodiment 1
The preheating of 47kg powderies exothermic mixture, 53kg silica sands are heated to 130 DEG C, by them after puddle mixer mixed grind is uniform, 2kg is added
After the S of resin mixed grind 75, the 0.5kg methenamine aqueous solution is added（0.17kg methenamines and 0.33kg water mixtures）The S of mixed grind 40,
Add and sand shaping is put after the S of 0.18kg calcium stearates mixed grind 90.
Embodiment 2
The preheating of 45kg powderies exothermic mixture, 55kg silica sands are heated to 105 DEG C, by them after puddle mixer mixed grind is uniform, 1kg is added
After the S of resin mixed grind 80, the 1.3kg methenamine aqueous solution is added（0.43kg methenamines and 0.87kg water mixtures）The S of mixed grind 30,
Add and sand shaping is put after the S of 0.15kg calcium stearates mixed grind 100.
Embodiment 3
The preheating of 50kg powderies exothermic mixture, 50kg silica sands are heated to 140 DEG C, by them after puddle mixer mixed grind is uniform, 3kg is added
After the S of resin mixed grind 70, the 0.9kg methenamine aqueous solution is added（0.3kg methenamines and 0.6kg water mixtures）The S of mixed grind 50, then
Add and sand shaping is put after the S of 0.2kg calcium stearates mixed grind 70.
With JB-T8583-2008 castings precoated sand standard（National standard）For standard, to heating overlay film made from embodiment 1-3
Sand carries out performance test, as a result as shown in table 1.
Table 1
As shown in Table 1, heating precoated sand intensity produced by the present invention is fitted, and caloric value is especially excellent.
Application examples
When casting disjunctor turbocharger exhaust manifold, the core of taper is made using heating precoated sand produced by the present invention,
In moulding, by the core fixed placement of taper at dead head top nest center, sand solidify afterwards molding is penetrated, rising head does not solidify and bound,
Dead head top rolls up sunken effect preferably, fully solves product because rising head premature solidification binds, and gas row is retained in casting not in time
The defect of stomata and shrinkage porosite is produced inside part.
Claims (10)
1. a kind of preparation method for the precoated sand that generates heat, it is characterised in that preheat powdery exothermic mixture, silica sand is heated to 105-140
DEG C, by them after puddle mixer mixed grind is uniform, add after resin mixed grind 70-80S, add methenamine aqueous solution mixed grind 30-
50S, adds and sand shaping is put after calcium stearate mixed grind 70-100S.
2. preparation method according to claim 1, it is characterised in that preheat powdery exothermic mixture, silica sand is heated to 130
DEG C, by them after puddle mixer mixed grind is uniform, add after resin mixed grind 75S, add methenamine aqueous solution mixed grind 40S, then add
Enter to put sand shaping after calcium stearate mixed grind 90S.
3. preparation method according to claim 2, it is characterised in that the weight ratio of the silica sand and the exothermic mixture is。
4. preparation method according to claim 3, it is characterised in that the weight ratio of the silica sand and the exothermic mixture is
53:47。
5. the preparation method according to any one in claim 1-4, it is characterised in that the exothermic mixture is efficient heating
Coverture YG-ZB.
6. preparation method according to claim 2, it is characterised in that the resin is phenolic resin, its be exothermic mixture with
The 1-3% of the gross weight of silica sand.
7. preparation method according to claim 2, it is characterised in that the methenamine aqueous solution is exothermic mixture and silica sand
Gross weight 0.5-1.3%.
8. preparation method according to claim 7, it is characterised in that the methenamine aqueous solution is by 1 parts by weight
Methenamine and the water of 2 parts by weight are mixed.
9. preparation method according to claim 2, it is characterised in that the calcium stearate is the gross weight of exothermic mixture and silica sand
The 0.15-0.2% of amount.
10. generate heat precoated sand made from the preparation method in a kind of 1-9 such as claim as described in any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710352728.4A CN107252872A (en) | 2017-05-18 | 2017-05-18 | One kind heating precoated sand and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710352728.4A CN107252872A (en) | 2017-05-18 | 2017-05-18 | One kind heating precoated sand and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107252872A true CN107252872A (en) | 2017-10-17 |
Family
ID=60028083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710352728.4A Pending CN107252872A (en) | 2017-05-18 | 2017-05-18 | One kind heating precoated sand and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110449546A (en) * | 2019-09-20 | 2019-11-15 | 重庆长江造型材料（集团）股份有限公司 | A kind of preparation process of riser precoated sand |
| CN110479953A (en) * | 2019-09-20 | 2019-11-22 | 重庆长江造型材料（集团）股份有限公司 | A kind of riser precoated sand |
| CN111203517A (en) * | 2020-02-26 | 2020-05-29 | 合肥禾松信息科技有限公司 | Precoated sand casting process of metal valve |
| CN117020105A (en) * | 2023-08-29 | 2023-11-10 | 河北北方铸业有限公司 | Precoated sand for casting and production process thereof |
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| CN103231009A (en) * | 2013-04-16 | 2013-08-07 | 繁昌县恒鑫汽车零部件有限公司 | Easy permeability precoated sand |
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| CN106222534A (en) * | 2016-08-24 | 2016-12-14 | 衢州顺丰汽车部件有限公司 | A kind of casting technique of magnesium iron casing |
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| JPS62257979A (en) * | 1986-05-01 | 1987-11-10 | フオセコ・インタ−ナシヨナル・リミテツド | Heat generating composition |
| JPH04123841A (en) * | 1990-09-14 | 1992-04-23 | Masamitsu Miki | Production of exothermic neck-down core and exothermic neck-down core |
| JPH06297081A (en) * | 1993-04-12 | 1994-10-25 | Masamitsu Miki | Blind feeder sleeve with exothermic core |
| JP2000317578A (en) * | 1999-05-11 | 2000-11-21 | Kao Corp | Heat generating element |
| JP2003136201A (en) * | 2001-10-30 | 2003-05-14 | Hodogaya Ashland Kk | Exothermic material for casting and exothermic formed article for casting using it |
| CN1758968A (en) * | 2003-12-05 | 2006-04-12 | 明和化学工业株式会社 | Material for forming exothermic article for casting, exothermic article for casting, and method for producing tehm |
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| JP4749948B2 (en) * | 2006-06-23 | 2011-08-17 | 滲透工業株式会社 | Exothermic molding for casting |
| JP2012101279A (en) * | 2010-10-14 | 2012-05-31 | Lignyte Co Ltd | Phenol resin binder composition, binder coated refractory and method for manufacturing the same, and mold and method for manufacturing the same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110449546A (en) * | 2019-09-20 | 2019-11-15 | 重庆长江造型材料（集团）股份有限公司 | A kind of preparation process of riser precoated sand |
| CN110479953A (en) * | 2019-09-20 | 2019-11-22 | 重庆长江造型材料（集团）股份有限公司 | A kind of riser precoated sand |
| CN111203517A (en) * | 2020-02-26 | 2020-05-29 | 合肥禾松信息科技有限公司 | Precoated sand casting process of metal valve |
| CN111203517B (en) * | 2020-02-26 | 2020-12-22 | 浙江卡博铜业有限公司 | Precoated sand casting process of metal valve |
| CN117020105A (en) * | 2023-08-29 | 2023-11-10 | 河北北方铸业有限公司 | Precoated sand for casting and production process thereof |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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Application publication date: 20171017 |