CN101823130A - Composite covering agent and use method thereof in production of cylinder cover casting - Google Patents
Composite covering agent and use method thereof in production of cylinder cover casting Download PDFInfo
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- CN101823130A CN101823130A CN 201010172549 CN201010172549A CN101823130A CN 101823130 A CN101823130 A CN 101823130A CN 201010172549 CN201010172549 CN 201010172549 CN 201010172549 A CN201010172549 A CN 201010172549A CN 101823130 A CN101823130 A CN 101823130A
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- covering agent
- composite covering
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- iron liquid
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Abstract
The invention discloses a composite covering agent and a use method thereof in the production of a cylinder cover casting. The composite covering agent consists of a composite covering agent I and a composite covering agent II, wherein the composite covering agent I consists of the following components in parts by mass: 80-90 parts of SiC, 5-6 parts of recarbonizer and 5-15 parts of perlite; and the composite covering agent II consists of the components in parts by mass: 35-45 parts of inoculant and 55-65 parts of perlite. In the invention, the composite covering agents are adopted in the production of the cylinder cover casting to remove impurities and gas out of iron liquid so as to improve the metallurgical quality of the iron liquid; when heat preservation and collecting residues are carried out, the inoculation fade of the iron liquid is prevented, a favorable inoculation effect is obtained, thereby processing properties and mechanical properties of the cylinder cover are improved; meanwhile, a fine powder inoculant is turned into valuable materials and complies with the policies of recycling economy and low carbon economy. The invention has simple prescription, wide source materials which are easily obtained, simple use method, easy implementation, low production cost and favorable use effect.
Description
Technical field
The present invention relates to a kind of casting technique, the using method of especially a kind of composite covering agent in cylinder head casting is produced.
Background technology
Cylinder head is one of engine major part, and it has significant impact to many technical parameters of engine.Temperature sharply changes repeatedly during because of engine operation, because the continuous alternating thermal stress that produces of the expansion of generation and contraction causes fatigue failure easily.Therefore to the cylinder cap material, air-tightness etc. require very high, and the Casting Technology difficulty is big.At present, usually the melting mode that adopts is open melting, and iron liquid temp height, therefore the easy oxidation of iron liquid produces slag inclusion, decarburization, inoculation fade phenomenon, particularly slag inclusion causes that cylinder cap inlet and outlet road seepage causes foundry goods to scrap, and causes the percent defective of product high, though now many technological measures of implementing at this problem are arranged also, majority all produces little effect.
Summary of the invention
The objective of the invention is: a kind of composite covering agent and the using method in cylinder head casting is produced thereof are provided, it can obviously improve metallurgical quality, the cylinder cap quality is greatly improved, and cylinder cap inlet and outlet road percolation ratio (percent defective) significantly descends, to overcome the deficiencies in the prior art.
The present invention is achieved in that composite covering agent, and it is made up of composite covering agent I and two parts of composite covering agent II; Press mass fraction and calculate, the composite covering agent I is made up of 80～90 parts of SiC, 5～6 parts of carburants and 5～15 parts of perlites; The composite covering agent II is made up of 35～45 parts of inovulants and 55～65 parts of perlites.
Inovulant is the inovulant of fine-powdered.
Composite covering agent is using method in cylinder head casting is produced, after the furnace charge fusing of cylinder head casting, promptly in stove, add the composite covering agent I, skim, go out water treatment after making iron liquid be warming up to the temperature of technological requirement, again the composite covering agent II is added in the iron liquid after handling, pour into a mould then.
Carburant is the graphited high-quality carburant of process, the content of its carbon 〉=95%, and S＜0.15%, granularity is 1～6mm.The high-quality carburant carbon atom of handling through high temperature graphitization could become the sheet arrangement from original lack of alignment, and flake graphite just can become the best core of graphite forming core, in order to promoting graphitization, and the carbon that obtains with the carburetting mode, its activity is good, graphitizing is more remarkable, the foundry goods metallographic reflects that graphite form is better, is more evenly distributed, thus the mechanical property of raising foundry goods, reduce and shrink tendency, improve processing characteristics.
Analysis on Mechanism is as follows:
1, composite covering agent I
(1) the free energy Δ of generation oxides such as C, the Si in the composite covering agent I, Al is lower than Fe for F °; At high temperature, have following several reaction to carry out:
And CO is at high temperature along with free energy is declined to become stable gas come-up, cause iron liquid boiling and slag ratio in the iron liquid is heavy less than iron liquid, thereby the slag come-up of generation is adsorbed by perlite, caking floats to the surface of smelting furnace, by measure such as skimming, iron liquid is purified.
(2) carburant mainly replenishes the scaling loss of iron liquid hot stage carbon, and carbon increasing amount is about 0.05%.
2, composite covering agent II
(1) inovulant of fine-powdered is the residue in the inovulant use, and it is used as instantaneous inovulant, improves the pregnant effect of iron liquid, meets the theory of recycling economy;
(2) play collection slag and insulation effect behind the pearl stone puffing.
3, conclusion
(1) composite covering agent of the present invention is used in cylinder head casting is produced, can effectively remove field trash and gas in the iron liquid, increase substantially the metallurgical quality of iron liquid.
(2) use composite covering agent of the present invention, in insulating slag-collecting, prevent the inoculation fade of iron liquid again, obtain good pregnant effect, improve the processing performance and the mechanical property of cylinder cap; Simultaneously, the fine powder inovulant is turned waste into wealth, meet the policy of recycling economy and low-carbon economy.
(3) use composite covering agent of the present invention, steady production high strength, thin-wall part are played great positive role.
Owing to adopted technique scheme, compared with prior art, the present invention uses composite covering agent make a return journey field trash and gas in the deironing liquid in cylinder head casting production, to improve the metallurgical quality of iron liquid, and in insulating slag-collecting, prevent the inoculation fade of iron liquid again, obtain good pregnant effect, improve the processing performance and the mechanical property of cylinder cap; Simultaneously, the fine powder inovulant is turned waste into wealth, meet the policy of recycling economy and low-carbon economy.The present invention adopts prescription simple, and material source is extensive, obtains easily, and using method is simple, implement easily, and low production cost, result of use is good.
The specific embodiment
Embodiments of the invention: composite covering agent, it is made up of composite covering agent I and two parts of composite covering agent II; Calculate according to the mass fraction, the composite covering agent I is made up of 90 parts of SiC, 6 parts of high-quality carburants (content of carbon is 98%, and the content of S is 0.12%, and granularity is 5mm) and 10 parts of perlites; The composite covering agent II is made up of inovulant (can select 75FeSi for use, also can select high efficiency composite inoculant for use) and 55～60 parts of perlites of 40 parts of fine-powdered.
The using method of composite covering agent in cylinder head casting is produced, after the furnace charge fusing of cylinder head casting, promptly in stove, add the composite covering agent I, skim, go out water treatment after making iron liquid be warming up to the temperature of technological requirement, again the composite covering agent II is added in the iron liquid after handling, pour into a mould then.
The free energy Δ of generation oxides such as the C in the composite covering agent I, Si, Al is lower than Fe for F °; Following reaction at high temperature takes place:
And CO is at high temperature along with free energy is declined to become stable gas come-up, cause iron liquid boiling and slag ratio in the iron liquid is heavy less than iron liquid, thereby the slag come-up of generation is adsorbed by perlite, caking floats to the surface of smelting furnace, by measure such as skimming, iron liquid is purified; Carburant mainly replenishes the scaling loss of iron liquid hot stage carbon, and carbon increasing amount is about 0.05%.
The composite covering agent II adopts the inovulant (residue in the inovulant use) of fine-powdered, and it is used as instantaneous inovulant, improves the pregnant effect of iron liquid, and meets the theory of recycling economy; Play collection slag and insulation effect behind the pearl stone puffing.
Therefore composite covering agent of the present invention is used in cylinder head casting is produced, can effectively remove field trash and gas in the iron liquid, increase substantially the metallurgical quality of iron liquid; In insulating slag-collecting, prevent the inoculation fade of iron liquid again, obtain good pregnant effect, improve the processing performance and the mechanical property of cylinder cap; Simultaneously, the fine powder inovulant is turned waste into wealth, meet the policy of recycling economy and low-carbon economy; Use composite covering agent of the present invention, steady production high strength, thin-wall part are played great positive role.
Claims (4)
1. composite covering agent is characterized in that: it is made up of composite covering agent I and two parts of composite covering agent II; Calculate according to the mass fraction, the composite covering agent I is made up of 80～90 parts of SiC, 5～6 parts of carburants and 5～15 parts of perlites; The composite covering agent II is made up of 35～45 parts of inovulants and 55～65 parts of perlites.
2. composite covering agent according to claim 1 is characterized in that: inovulant is the inovulant of fine-powdered.
3. one kind is adopted the using method of the described composite covering agent of claim 1 in cylinder head casting is produced, it is characterized in that: after the furnace charge fusing of cylinder head casting, promptly in stove, add the composite covering agent I, skim, go out water treatment after making iron liquid be warming up to the temperature of technological requirement, again the composite covering agent II is added in the iron liquid after handling, pour into a mould then.
4. the using method of composite covering agent according to claim 1 in cylinder head casting is produced is characterized in that: carburant is the graphited high-quality carburant of process, the content of its carbon 〉=95%, and S＜0.15%, granularity is 1～6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101725490A CN101823130B (en) | 2010-05-14 | 2010-05-14 | Composite covering agent and use method thereof in production of cylinder cover casting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101725490A CN101823130B (en) | 2010-05-14 | 2010-05-14 | Composite covering agent and use method thereof in production of cylinder cover casting |
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| Publication Number | Publication Date |
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| CN101823130A true CN101823130A (en) | 2010-09-08 |
| CN101823130B CN101823130B (en) | 2012-06-20 |
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| CN2010101725490A Active CN101823130B (en) | 2010-05-14 | 2010-05-14 | Composite covering agent and use method thereof in production of cylinder cover casting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103203427A (en) * | 2012-07-16 | 2013-07-17 | 贵州英吉尔机械制造有限公司 | Molding and casting method for automobile cylinder cover with high air-tightness |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101456065A (en) * | 2007-12-12 | 2009-06-17 | 贾维静 | Composite incubation forging technique |
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2010
- 2010-05-14 CN CN2010101725490A patent/CN101823130B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101456065A (en) * | 2007-12-12 | 2009-06-17 | 贾维静 | Composite incubation forging technique |
Non-Patent Citations (3)
| Title |
|---|
| 《现代铸铁》 20080131 张文和等 灰铸铁与蠕墨铸铁缸体缸盖铁液处理技术 21-27 1-4 , 2 * |
| 《铸造》 19861130 陈玉造等 高强灰铸铁孕育覆盖剂的研究 4-8 1-4 , 2 * |
| 《铸造》 19870830 潘承嘉等 孕育覆盖剂的研制及其在机床类铸件上的应用 25-28 1-4 , 2 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103203427A (en) * | 2012-07-16 | 2013-07-17 | 贵州英吉尔机械制造有限公司 | Molding and casting method for automobile cylinder cover with high air-tightness |
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| CN101823130B (en) | 2012-06-20 |
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