CN101818226A - Charge composition of synthetic cast iron and method for preparing cylinder head castings - Google Patents
Charge composition of synthetic cast iron and method for preparing cylinder head castings Download PDFInfo
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- CN101818226A CN101818226A CN201010172550A CN201010172550A CN101818226A CN 101818226 A CN101818226 A CN 101818226A CN 201010172550 A CN201010172550 A CN 201010172550A CN 201010172550 A CN201010172550 A CN 201010172550A CN 101818226 A CN101818226 A CN 101818226A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a charge composition of synthetic cast iron, comprising the following components in parts by weight: 45 to 55 parts of scrap steel, 25 to 35 parts of scrap returns, 15 to 25 parts of pig iron, 2 to 3 parts of recarbonizer and 0.25 to 0.35 part of bred silicoferrite. A large amount of scrap steel and a little pig iron are adopted for manufacturing complex cylinder head castings with thin walls, and the obtained products have good strength and little rejection rate. The production cost can be effectively reduced, and the quality of the castings can be obviously improved. Moreover, an electric cooker is used for heating during smelting, the furnace cupola used traditionally is avoided, and the invention has good environmental-friendly effect. The sulfur content in the local pig iron in Guizhou is high, so the working procedure of resulfurization can be avoided by adopting the local pig iron in Guizhou. The production procedure is simplified, and the manufacture cost is reduced. The invention has the advantages of simple method, easy implementation, low production cost and good using effect.
Description
Technical field
The present invention relates to a kind of casting technique, especially a kind of charge composition of synthetic cast iron and prepare the method background technology of cylinder cap casting.
Cylinder head is one of engine major part, and it has great effect to many technical parameters of engine, thereby the dimension precision requirement height, and the surfaces externally and internally specification of quality is tight; The casting structure complexity, wall thickness differs greatly, core is many and complicated during shaping, water cavity requires flowing water unobstructed, and temperature sharply changes repeatedly during work, owing to the expansion and the contraction that constantly produce produce alternating thermal stress, cause fatigue failure easily, therefore require cylinder head casting rational in infrastructure, material has high intensity, hardness and good anti-fatigue performance, castability and resistance to air loss, and casting technique and technical difficulty are big.The double melting (cupola furnace+electric furnace) of the most of employing of the main flow producer of domestic production cylinder cap at present molten iron, and this method must be used high duty pig iron in a large number, because the great development of China's Iron And Steel Industry, pig iron resource is in short supply day by day, the measured pig iron valency of matter height, the market purchasing difficulty becomes the difficult point of many producers stably manufactured high strength, thin-wall complicated controlling quality and cost.And Guizhou Province be applicable to produce cylinder cap class foundry goods the pig iron still less, most of pig iron is owing to exist the multiple element that influences castability and mechanical castings, produce cylinder body, cylinder head casting according near Diesel Engine Plants such as the south foundry iron that certain factory produces using the Guiyang nineties in last century, casting quality significantly descends, mainly show as defectives such as producing a large amount of shrinkage cavities, shrinkage porosite, seepage and mechanical property is difficult to reach technical requirements, had a strong impact on the reliability of foundry goods.
Summary of the invention
The objective of the invention is: a kind of charge composition of synthetic cast iron is provided and prepares the method for cylinder cap casting, it can effectively reduce the usage quantity of the pig iron in the foundry goods, can reduce production costs, and can improve casting quality again, to overcome the deficiencies in the prior art.
The present invention is achieved in that
The pig iron is the Guizhou local cast iron.
The carbon content of carburelant is greater than 90% high-quality carburelant.
Breeding ferrosilicon is 75% ferro-silicon.
Adopt charge composition of the present invention to prepare the method for cylinder cap casting, with steel scrap, foundry returns, the pig iron, carburelant and breed ferrosilicon and under the temperature more than 1500 ℃, carry out melting, obtain molten iron; Molten iron is poured into a mould under 1380～1450 ℃, and be 7～10s the duration of pouring, carries out demoulding sand removal behind the casting complete, again the foundry goods behind the knockout carried out Shot Blasting.
The CE value of melting is controlled at 3.9%～4.05%.
Melting adopts electric furnace to heat.
The resulting product of the method according to this invention is carried out analyzing and testing, its chemical ingredients, metallographic structure and mechanical property table 1, table 2.
Table 1 cylinder cap chemical ingredients W
B(%)
Metallographic structure of table 2 cylinder cap and mechanical property
By table 1, table 2 as can be seen the cylinder cap quality be greatly improved, this technological operation is easy, process is controlled easily, and is workable, it has following technical characterstic:
(1) there are many thick hypereutectic graphite in the pig iron, this thick graphite has heredity, thick graphite was difficult to eliminate when particularly smelting temperature was low, like this, thick graphite can be genetic in the solid-state structure of cast iron, the pig iron consumption of vast scale, reduce the intensity that cast iron can reach on the one hand, the graphitizing that should produce in the process of setting is weakened, cause the contraction tendency of iron liquid process of setting to increase, the steel scrap of vast scale adds carburelant can fine addressing this problem.
(2) generally contain alloying elements such as Ti, V, Cr in the pig iron.These elements hinder greying more, and Ti hinders graphite element especially by force.Vast scale uses the pig iron, when Ti content in the iron liquid〉0.05% the time, iron liquid process of setting not only shrinks tendency, and chilling tendency increases, and also worsens the processing characteristics of cast iron.Casting generally do not contain alloying element such as Ti, V, Cr with steel scrap or content extremely low, vast scale uses steel scrap to add recarburization process, can eliminate the disadvantageous effect of these elements.
(3) adopt the high-quality carburelant: have high purity, splendid particle form and graphited crystalline structure, not only play recarburization, and can also promote the inoculation of Gray Iron forming core, improve the graphite refinement, increase number of graphite ball, absorbed the specific absorption height (more than 90%) of carbon easily by iron liquid.
Therefore the present invention has following characteristics:
1, furnace charge adopts a large amount of steel scraps, and a small amount of pig iron had both reduced cost, had improved quality product again, has also proved that the employing local cast iron also can produce high strength, thin-wall complicated cylinder head casting simultaneously.
2, can obtain the molten iron phosphorous, that sulphur is low.The proneness that low phosphorus content makes cylinder head casting produce shrinkage porosite and seepage defect reduces.
3, can avoid pig iron heredity influence with the pig iron less, the cast iron graphite form is good, ball light body burden height, good mechanical property, and under equal carbon equivalent situation, synthetic cast iron improves one more than the trade mark than the cast iron of traditional cupola furnace or electrosmelting.
Owing to adopted technique scheme, compared with prior art, the present invention adopts a large amount of steel scraps and a small amount of pig iron to make thin-wall complicated cylinder head casting, and resulting product strength is good, scrap rate is low, can effectively reduce production costs, can also significantly improve casting quality.And the heating of melting employing electric furnace, avoided using traditional cupola furnace, environment protecting is good.Because sulphur content is higher in the pig iron of Guizhou, therefore adopts the Guizhou pig iron also can remove from and increase the sulphur operation, simplified production process, reduced cost of manufacture.Institute of the present invention employing method is simple, implements easily, and low production cost, result of use is good.
Embodiment
Embodiments of the invention: the charge composition of synthetic cast iron, to calculate by mass fraction, it comprises that 50 parts of steel scraps, 30 parts of foundry returns, 20 parts of Guizhou pig iron, 2 parts of carbon content are greater than high-quality carburelant and 0.3 part of 75% ferro-silicon of 90%.
The method for preparing cylinder cap casting, 50 parts of steel scraps, 30 parts of foundry returns, 20 parts of Guizhou pig iron, 2 parts of high-quality carburelants and 0.3 part are bred ferrosilicon adopts electric furnace to carry out melting, smelting temperature is 1600 ℃, and the CE value of melting is controlled at 3.9%～4.05%, obtains molten iron; Molten iron is poured into a mould under 1380～1450 ℃, and be 7～10s the duration of pouring, carries out demoulding sand removal behind the casting complete, again the foundry goods behind the knockout carried out Shot Blasting.
Owing to have many thick hypereutectic graphite in the pig iron, this thick graphite has heredity, thick graphite was difficult to eliminate when particularly smelting temperature was low, like this, thick graphite can be genetic in the solid-state structure of cast iron, the pig iron consumption of vast scale, reduce the intensity that cast iron can reach on the one hand, the graphitizing that should produce in the process of setting is weakened, cause the contraction tendency of iron liquid process of setting to increase, so the present invention add carburelant by the steel scrap that adds vast scale and solve this problem.Simultaneously, owing to generally contain alloying elements such as Ti, V, Cr in the pig iron.These elements hinder greying more, and Ti hinders graphite element especially by force, if vast scale uses the pig iron, when Ti content in the iron liquid〉0.05% the time, iron liquid process of setting not only shrinks tendency, and chilling tendency increases, and also worsens the processing characteristics of cast iron.But casting does not generally contain alloying element such as Ti, V, Cr with steel scrap or content is extremely low, so vast scale uses steel scrap to add recarburization process, can effectively eliminate the disadvantageous effect of these elements.Adopt high-quality carburelant (having high purity, splendid particle form and graphited crystalline structure) not only to play recarburization, and can also promote the inoculation of Gray Iron forming core, and improve the graphite refinement, increase number of graphite ball, absorbed the specific absorption height (more than 90%) of carbon easily by iron liquid.
Claims (7)
1. the charge composition of a synthetic cast iron is characterized in that: calculate by mass fraction, it comprises that 45～55 parts of steel scraps, 25～35 parts of foundry returns, 15～25 parts of pig iron, 2～3 parts of carburelants and 0.25～0.35 part breed ferrosilicon.
2. the charge composition of synthetic cast iron according to claim 1, it is characterized in that: the pig iron is the Guizhou local cast iron.
3. the charge composition of synthetic cast iron according to claim 1 is characterized in that: the carbon content of carburelant is greater than 90% high-quality carburelant.
4. the charge composition of synthetic cast iron according to claim 1, it is characterized in that: breeding ferrosilicon is 75% ferro-silicon.
5. the charge composition by the described synthetic cast iron of claim 1 prepares the method for cylinder cap casting, it is characterized in that: with steel scrap, foundry returns, the pig iron, carburelant and breed ferrosilicon and carry out melting under the temperature more than 1500 ℃, obtain molten iron; Molten iron is poured into a mould under 1380～1450 ℃, and be 7～10s the duration of pouring, carries out demoulding sand removal behind the casting complete, again the foundry goods behind the knockout carried out Shot Blasting.
6. the method for preparing cylinder cap casting according to claim 5 is characterized in that: the CE value of melting is controlled at 3.9%～4.05%.
7. the method for preparing cylinder cap casting according to claim 5 is characterized in that: melting adopts electric furnace to heat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201010172550A CN101818226A (en) | 2010-05-14 | 2010-05-14 | Charge composition of synthetic cast iron and method for preparing cylinder head castings |
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| CN201010172550A CN101818226A (en) | 2010-05-14 | 2010-05-14 | Charge composition of synthetic cast iron and method for preparing cylinder head castings |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104745758A (en) * | 2015-03-30 | 2015-07-01 | 宁夏众信机械设备制造有限公司 | Preparation method of gray iron casting |
| CN106756441A (en) * | 2016-12-08 | 2017-05-31 | 河北建支铸造集团有限公司 | Method using waste material production malleable cast iron pipe fitting is reclaimed |
| CN108359764A (en) * | 2018-04-10 | 2018-08-03 | 苏州勤堡精密机械有限公司 | Ironcasting automobile engine cylinder-body cast iron melting and preprocess method |
| CN110117688A (en) * | 2019-05-17 | 2019-08-13 | 重庆银河铸锻有限责任公司 | A kind of electro-smelting method of high-strength abrasion-proof idler wheel casting |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0686700A2 (en) * | 1994-06-07 | 1995-12-13 | Metallgesellschaft Ag | Titanium containing additive and its use for increasing the durability of a furnace refractory lining or as a slag former |
| CN1606656A (en) * | 2001-12-20 | 2005-04-13 | 万国引擎知识产权有限责任公司 | Gray cast iron for cylinder heads |
| JP2005256116A (en) * | 2004-03-12 | 2005-09-22 | Koyo Seiko Co Ltd | Briquette for metal raw material and its producing method |
| CN101660084A (en) * | 2009-09-28 | 2010-03-03 | 上汽通用五菱汽车股份有限公司 | Engine camshaft chilled cast iron and manufacturing method thereof |
-
2010
- 2010-05-14 CN CN201010172550A patent/CN101818226A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0686700A2 (en) * | 1994-06-07 | 1995-12-13 | Metallgesellschaft Ag | Titanium containing additive and its use for increasing the durability of a furnace refractory lining or as a slag former |
| CN1606656A (en) * | 2001-12-20 | 2005-04-13 | 万国引擎知识产权有限责任公司 | Gray cast iron for cylinder heads |
| JP2005256116A (en) * | 2004-03-12 | 2005-09-22 | Koyo Seiko Co Ltd | Briquette for metal raw material and its producing method |
| CN101660084A (en) * | 2009-09-28 | 2010-03-03 | 上汽通用五菱汽车股份有限公司 | Engine camshaft chilled cast iron and manufacturing method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104745758A (en) * | 2015-03-30 | 2015-07-01 | 宁夏众信机械设备制造有限公司 | Preparation method of gray iron casting |
| CN106756441A (en) * | 2016-12-08 | 2017-05-31 | 河北建支铸造集团有限公司 | Method using waste material production malleable cast iron pipe fitting is reclaimed |
| CN108359764A (en) * | 2018-04-10 | 2018-08-03 | 苏州勤堡精密机械有限公司 | Ironcasting automobile engine cylinder-body cast iron melting and preprocess method |
| CN110117688A (en) * | 2019-05-17 | 2019-08-13 | 重庆银河铸锻有限责任公司 | A kind of electro-smelting method of high-strength abrasion-proof idler wheel casting |
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Application publication date: 20100901 |