CN1095976A - The method of producing cast iron cylinder jacket by smelting in arc furnace - Google Patents
The method of producing cast iron cylinder jacket by smelting in arc furnace Download PDFInfo
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- CN1095976A CN1095976A CN 93111838 CN93111838A CN1095976A CN 1095976 A CN1095976 A CN 1095976A CN 93111838 CN93111838 CN 93111838 CN 93111838 A CN93111838 A CN 93111838A CN 1095976 A CN1095976 A CN 1095976A
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Abstract
A kind of method of producing cast iron cylinder jacket by smelting in arc furnace comprises operations such as batching, melting molten iron, inoculation, rotary casting.The control carbon equivalent is less than 4.3 during batching, and silicone content is less than 1.7% in the stove, and desired silicone content is by the inoculation adjustment.During the melting molten iron, charge preheating and fusion stage voltage control are at 40～80 volts, and current control is at 4000～5000 amperes, and the refining stage voltage control is at 40～80 volts, and current control is at 2500～3000 amperes, and the operating time is 20～25 minutes.Save energy of the present invention, power consumption is lower than 800kWh/t, and the cylinder sleeve scrap rate of being produced is lower than international standard less than 3%.
Description
The invention belongs to and adopt arc melting to produce the method for ironcasting, particularly a kind of method of producing cast iron cylinder cover.
Produce cast iron cylinder cover with arc melting, rotary casting, existing melting technology has two kinds.A kind of is all to adopt small power (power input 400KW), high-voltage, little current practice in each stage of melting, voltage generally is controlled at about 90～110 volts, electric current is no more than 2000 amperes, though this kind melting technology can make the scrap rate of cylinder sleeve be lower than 5%, but smelting time is grown (70～80 minutes), and power consumption is more than 900KWh/t.
A kind of is all to adopt high-power (power input 650KW), low voltage, big current practice in each stage of melting, voltage generally is controlled at 40～80 volts, current control is at 5000～6000 amperes, though this kind melting technology has shortened smelting time (30～40 minutes), power consumption has been reduced to about 780KWh/t, but the interior surface of cylinder liner that rotary casting is produced the blister piece occurs or is mingled with, and scrap rate reaches more than 60%.
The objective of the invention is to overcome the deficiencies in the prior art, a kind of method of improved producing cast iron cylinder jacket by smelting in arc furnace is provided, and this kind method can not only reduce power consumption, makes electric arc furnace standard up to specification, and can guarantee the quality of cylinder sleeve to make scrap rate be lower than 3%.
The present invention is achieved in that at the mechanism of the character-slag inclusion of the internal surface blister piece of cylinder sleeve and slag inclusion formation existing low power consumption technology is improved.Mechanism according to slag inclusion formation, existing low power consumption technology also adopts low voltage at the refining stage of melting molten iron, electric current is the major cause that forms oxidation sludge greatly, this is to be directly proportional with voltage from the distance of liquid level, to be inversely proportional to electric current because of carbon in the electric arc furnace, work as loss of voltage, when electric current increases, carbon just diminishes from the distance of liquid level, thereby raise slag and cause molten iron to expose melting, (H), (O), (N) plasma of forming under high temperature and arcing are entered in the molten iron in a large number, form FeO, Fe
2O
2, SiO
2, CaO, Na
2Oxide compounds such as O, in addition, the not melt that quick melting causes and the outfit of casting raw material are improper also to make the dregginess in the molten iron increase, and therefore, the present invention mainly improves batching and melting molten iron two procedures.The control carbon equivalent is less than 4.3 during batching, and silicone content is less than 1.7% in the stove, and desired silicone content is adjusted by the inoculation operation, can reduce the scaling loss of silicon like this, thereby reduces the scaling loss (silicon is scaling loss amount maximum under 1520 ℃) of silicon in the molten iron.During the melting molten iron, charge preheating and fusion stage adopt high-power (power input 650KW), low voltage, big electric current, voltage control at 40～80 volts, and current control is about 4500 amperes; Refining stage reduces power, adopts constant electric current, the current control of reducing of voltage at 2500～3000 amperes, and temperature rises to 1600～1700 ℃ in the stove, and the operating time is 20～25 minutes.It is this that to produce heat when different steps adopts the melting technology of different voltages, electric current both to make full use of big electric current big, reduce the advantage of energy consumption, carbon is bigger from the liquid level distance when having made full use of little electric current again, can not form exposed melting and heat reduces, slower advantage heats up, therefore both can reduce power consumption, avoid a large amount of generations of slag again.Simultaneously, refining stage with stove in temperature rise to 1600～1700 ℃ and suitably to increase the heating-up time be the key of removing oxidation sludge gradually because in the time of 1420～1600 ℃, the activity of C increases, combine with oxygen in molten iron, the oxygen of capturing in the oxide compound carries out reduction reaction generation CO and CO
2, when slag aggregate into group's shape and with ascending ability maximum after gas becomes mixture.
In order to reduce the slag source as far as possible, the present invention has carried out strict selecting to foundry iron when getting the raw materials ready, or selects for use the trade mark less than Z
14The pig iron, or select white pig iron for use, or select conversion pig for use, or select the tiny pig iron of graphite for use.
In order to make pregnant effect better, the nucleating agent that inoculation of the present invention is used is the mixture of Si-Ba composite inoculant and Fe-Si75 composition, and the add-on of nucleating agent is 0.2～0.4%.
The present invention has the following advantages:
1, saves energy, power consumption are lower than 800KWh per ton.
2, fundamentally solved the blister piece or the inclusion defect of interior surface of cylinder liner, the cylinder sleeve scrap rate of being produced is lower than 3%, is significantly less than the index (national rotary casting cylinder sleeve scrap rate index such as American and Britain, moral, Italy is＜5%) of international cylinder sleeve scrap rate.
3, simple to operate, be easy to realize.
Embodiment: 135 cylinder sleeve
The technical process of present embodiment comprises operations such as batching, melting molten iron, inoculation, cast, cooling, the demoulding, cleaning, check.Electric arc furnace power is 650KW.
Batching: Benxi pig iron 20%, vanadium titanium iron 16%, the Lufeng pig iron 20%, the red steel pig iron 5%, foundry return 25%, iron filings 15%, other alloys 5%.
Go into stove composition: C 3.49%, Si 1.7%, Mn 0.90%, P 0.35%, S 0.03%, Cr 0.25%, V 0.32%, Ti 0.10%.
Product composition: C 3.1～3.5%, Si 2.1～2.5%, Mn 0.7～0.9%, P 0.3～0.5%, S≤0.08%, Cr 0.2～0.3%, V 0.25～0.35%, Ti 0.05～0.15%.
The melting molten iron: preheating fusion stage voltage control at 50 volts, current control at 4500 amperes; Refining stage, voltage control are at 50 volts, and current control is at 2500 amperes, and temperature rises to 1650 ℃ in the stove, and the operating time is 20 minutes.
Molten iron seat bag probe temperature: 1500 ℃.
Inoculation: nucleating agent is the mixture that Si-Ba composite inoculant and Fe-Si75 form, and wherein the content of Si-Ba composite inoculant is 50%, and the content of Fe-Si75 is 50%.The add-on of nucleating agent is 0.3%.
Teeming temperature: be not less than 1260 ℃.
Cylinder sleeve thermal technology scrap rate is below 3%.
Claims (3)
1, a kind of method of producing cast iron cylinder jacket by smelting in arc furnace, technical process comprise operations such as batching, melting molten iron, inoculation, cast, cooling, the demoulding, cleaning, check, it is characterized in that:
(1) when batching control carbon equivalent is less than 4.3, in the stove silicone content less than 1.7%,
(2) during the melting molten iron, charge preheating and fusion stage are adopted high-power, low voltage, big electric current, voltage control is at 40～80 volts, and current control is at 4500 amperes, and refining stage reduces power, the constant electric current that reduces of voltage, voltage control is at 40～80 volts, and current control is at 2500～3000 amperes, and temperature rises to 1600 °～1700 ℃ in the stove, operating time is 20～25 minutes
(3) adjust the silicone content of molten iron during inoculation, make it reach the requirement of Chemical Composition silicon.
2, method according to claim 1 is characterized in that the nucleating agent that inoculation is used is Si-Ba composite inoculant and Fe-Si
75The mixture of forming, the add-on of nucleating agent is 0.2～0.4%.
3, method according to claim 1 and 2, foundry iron or select for use the trade mark when it is characterized in that preparing burden less than Z
14The pig iron, or select conversion pig for use, or select white pig iron for use, or select the tiny pig iron of graphite for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93111838 CN1095976A (en) | 1993-06-03 | 1993-06-03 | The method of producing cast iron cylinder jacket by smelting in arc furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93111838 CN1095976A (en) | 1993-06-03 | 1993-06-03 | The method of producing cast iron cylinder jacket by smelting in arc furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1095976A true CN1095976A (en) | 1994-12-07 |
Family
ID=4989592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93111838 Pending CN1095976A (en) | 1993-06-03 | 1993-06-03 | The method of producing cast iron cylinder jacket by smelting in arc furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1095976A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100348854C (en) * | 2004-12-11 | 2007-11-14 | 董宽志 | Manufacturing method of laminated gradient composite ceramic cylinder jacket |
| CN1921968B (en) * | 2004-02-20 | 2012-07-11 | 通用汽车公司 | Casting mold for engine block |
| CN102712034A (en) * | 2009-11-25 | 2012-10-03 | 伊纳斯米特基金会 | Inoculation procedure and device |
-
1993
- 1993-06-03 CN CN 93111838 patent/CN1095976A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1921968B (en) * | 2004-02-20 | 2012-07-11 | 通用汽车公司 | Casting mold for engine block |
| CN100348854C (en) * | 2004-12-11 | 2007-11-14 | 董宽志 | Manufacturing method of laminated gradient composite ceramic cylinder jacket |
| CN102712034A (en) * | 2009-11-25 | 2012-10-03 | 伊纳斯米特基金会 | Inoculation procedure and device |
| CN102712034B (en) * | 2009-11-25 | 2014-06-18 | 伊纳斯米特基金会 | Inoculation procedure and device |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |