CN100516593C - Automobile rear-bridge spiral conic gear of manganese-copper alloy autenite-bainite nodular iron and its preparing method - Google Patents
Automobile rear-bridge spiral conic gear of manganese-copper alloy autenite-bainite nodular iron and its preparing method Download PDFInfo
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- CN100516593C CN100516593C CNB2006101247878A CN200610124787A CN100516593C CN 100516593 C CN100516593 C CN 100516593C CN B2006101247878 A CNB2006101247878 A CN B2006101247878A CN 200610124787 A CN200610124787 A CN 200610124787A CN 100516593 C CN100516593 C CN 100516593C
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Abstract
This invention relates to a MnCu alloy ADI car rear axle screw bevel gear and its preparation method, which takes ordinary pig iron as the raw material of said gear, applies a duplex method of cupola and electric cooker, takes rear earth, Mg and silicon iron alloy as the nodulizer to be processed then to slag and eliminate slag, gestates and casts the gear roughcast in two times, then finishes it after mechanical process, isothermal quenching and temper, in which, the composed weight percentage of said gear is: C 3.4-3.8%, Si 2.4-2.9%, Mn 0.4-1.0%, Cu 0.5-1.2%, P less than 0.06%, S less than 0.02% and the rest is iron.
Description
Technical field
The present invention relates to a kind of automobile rear-bridge spiral conic gear of manganese-copper alloy autenite-bainite nodular iron and preparation method thereof.
Background technique
MJohansson in 1977 announces that the Karkkila foundry under the Finland Kymi Kymmene company invented austempered ductile iron (ADI), and in American and Britain, method, the patent that 13 national applications such as added.This magnesium iron is a matrix with bainite type ferrite and austenite, wherein contains 20～40% austenite, gives higher plasticity of this magnesium iron and toughness, has the excellent comprehensive mechanical property.And, can significantly improve its fatigue strength and wear resistance because austenite has work hardening capacity.This material is particularly suitable for substituting 20CrMnTi alloy forged steel and makes gear, and have in light weight, noise is little, saves advantages such as the energy.
Produce qualified austempered ductile iron and need add the hardenability that alloying elements such as Mo, Ni, Cu improve material usually, in addition, raw-material manganese amount is had strict restriction (Mn＜0.3%).The alloy austenitic-bainite ductile iron of producing both at home and abroad mainly is MoCu system, MoNi system and MoCuNi system at present.In recent years,, make the manufacture cost of this alloy austenitic-bainite ductile iron of three types improve greatly, and the strict demand of manganese amount has been limited pig iron source, seriously restricted applying of austempered ductile iron owing to rising suddenly and sharply of the prices of raw and semifnished materials such as molybdenum-iron and nickel plate.
Since nineteen eighty, China has also carried out research and development to austempered ductile iron, MoCu system commonly used and MoCuNi system are applied to terminal gear of tractor and engine timing gear and have obtained achievement preferably, but the stability of mechanical property and cost of production problem have to be solved.
Current, global energy crisis and environmental pollution problem require the automobile lightweight imperative.Compare with 20CrMnTi alloy forged steel, adopt austempered ductile iron to make gear and can make product weight reduce 10%, can reduce the fuel consume and the exhaust emissions of automobile.In addition, the manufacturing of 20CrMnTi alloyed steel gear need consume a large amount of energy through smelting and series of processes such as rolling (production of forged steel section bar), forging and long-time carburizing and quenching heat treatment.And adopt austempered ductile iron to make gear, and form by the direct founding of pig iron, and shorten and simplified the heat treatment link all sidedly, significantly save the energy.Therefore, adopt austempered ductile iron to replace the 20CrMnTi alloyed steel to make automobile gear energy-saving and cost-reducing and developing of automobile industry are had strategic importance.
Summary of the invention
Technical problem to be solved by this invention is: a kind of novel manganin austempered ductile iron is provided, mainly utilize manganese and copper to guarantee the hardenability of material, and have high intensity, plasticity and toughness and good wear resistance, be applicable to and produce automobile (EQ140, EQ145) back axle helical bevel gear.
The present invention solves its technical problem and adopts following technological scheme:
Automobile rear-bridge spiral conic gear of manganese-copper alloy autenite-bainite nodular iron provided by the invention, its composition weight percentage is: C 3.4～3.8%, and Si 2.4～2.9%, and Mn 0.4～1.0%, and Cu 0.5～1.2%,＜0.06%P,＜0.02%S, surplus is an iron.
The method of the above-mentioned automobile rear-bridge spiral conic gear of manganese-copper alloy autenite-bainite nodular iron of preparation provided by the invention is: with the common new pig iron is raw material, alloying constituent selects for use Mn, Cu to guarantee the hardenability of material, the fusing of employing smelting equipment, with the rare earth magnesium ferrosilicon alloy is nodulant, handle back slag making slagging-off, breed the cast gear blank at twice, guarantee that the nodularization rate is 1～2 grade, 6～7 grades of sphere diameter sizes; Gear blank carries out austempering and temper after machining, get final product.The present invention compares with the 20CrMnTi alloy forged steel gear of using always, has following major advantage:
One. mechanical property of the present invention following (sand casting process 25mmY type test block sampling):
σ
b1020～1100MPa, δ 6.1～8.8%, α
k70～120J/cm
2, HRC32～34, HRC36 behind the strengthened shot peening～39, the comprehensive mechanical property height meets or exceeds foreign standard, and the good stability of mechanical property.
They are two years old. and with the common new pig iron and foundry returns is raw material, adopts cupola and electric furnace double melting.The no particular restriction requirement of the Mn amount that contains to the new pig iron has broken through the strictness restriction of traditional austempered ductile iron to the manganese amount, has enlarged the source of the new pig iron, convenient production.
They are three years old. and utilize cheap manganese and add an amount of copper to replace expensive molybdenum, nickel to improve the hardenability of material, can significantly reduce production costs.
They are four years old. and heat treatment process parameter can change in a big way, wait the good manufacturability of quenching, and heat treatment deformation is little.
They are five years old. and the automobile rear-bridge spiral conic gear of manganese-copper alloy autenite-bainite nodular iron of development (EQ140, EQ145 drive bevel gear and driven wheel of differential) by stand test, has reached NBS.Discharge check after the test and find, defectives such as flank of tooth flawless, spot corrosion, wear extent is little.
They are six years old. and common tide mould sand moulding is adopted in gear blank production, and casting technique is simple, is useful for industrialized mass.
Embodiment
The present invention adopts copper-manganese system, utilize cheap manganese and add the hardenability that an amount of copper guarantees material, and do not need to add expensive molybdenum, nickel alloy element, alloying constituent is when guaranteeing hardenability, austempered ductile iron intensity and the high characteristics of plasticity and toughness have also been guaranteed, also broken through simultaneously traditional austempered ductile iron production requirement and adopted the strictness restriction of low manganese hot metal (Mn＜0.3%), cost of production is starkly lower than 20CrMnTi alloy forged steel gear.
The composition weight percentage of automobile rear-bridge spiral conic gear of manganese-copper alloy autenite-bainite nodular iron of the present invention is: C 3.4～3.8%, and Si 2.4～2.9%, and Mn 0.4～1.0%, and Cu 0.5～1.2%,＜0.06%P, and＜0.02%S, surplus is an iron.
The weight percentage of above-mentioned copper-manganese content can adopt: Mn 0.6～0.9%, and Cu 0.7～1.1%.
The invention will be further described below in conjunction with specific embodiment, but do not limit content of the present invention.
Embodiment 1:
Operating method: with the common new pig iron is raw material, and alloying constituent is C 3.5～3.7%, and Si 2.6～2.8%, and Mn 0.6～0.8%, and Cu 0.7～0.9%,＜0.06%P, and＜0.02%S, surplus is an iron.Adopt cupola and electric furnace double melting, with the rare earth magnesium ferrosilicon alloy is nodulant, handle back slag making slagging-off, breed cast gear blank (EQ140 automobile axle spiral drive bevel gear and driven wheel of differential) at twice with 75% ferrosilicon, guarantee that the nodularization rate is 1～2 grade, 6～7 grades of ball warp sizes, gear blank is heated to 870～910 ℃ after machining, be incubated 2 hours, the whole temperature of the salt bath of quenching is in 360～375 ℃ the salt bath, be incubated 2 hours, 310～330 ℃ of tempering 3 hours, promptly can be made into automobile rear-bridge spiral conic gear of manganese-copper alloy autenite-bainite nodular iron subsequently.
Technical order: residual austenite content is 25～35%, and mechanical property is σ
b1035～1088MPa, δ 6.5～8.5%, α
k80～115J/cm
2, HRC32～34, HRC36 behind the strengthened shot peening～39.
Embodiment 2:
Operating method: except that Mn is 0.8～1.0%, Cu is 0.5～0.7%, other is with embodiment 1.
Technical order: residual austenite content is 25～35%, and mechanical property is σ
b1020～1100MPa, δ 6.1～7.6%, α
k70～110J/cm
2, HRC32～34, HRC37 behind the strengthened shot peening～39.
Embodiment 3:
Operating method: removing Mn is 0.4～0.6%, and Cu is outside 1.0～1.2%, and other is with embodiment 1.
Technical order: residual austenite content is 25～35%, and mechanical property is σ
b1025～1080MPa, δ 6.3～8.8%, α
k85～120J/cm
2, HRC32～33, HRC36 behind the strengthened shot peening～38.
Claims (5)
1. alloy austenitic-bainite ductile iron gear, by weight percentage, its composition contains C 3.4～3.8%, Si 2.4～2.9%, it is characterized in that: described alloy austenitic-bainite ductile iron gear is an automobile rear-bridge spiral conic gear of manganese-copper alloy autenite-bainite nodular iron, and its composition also contains Mn 0.4～1.0%, Cu 0.5～1.2%, P＜0.06%, S＜0.02%, surplus is an iron.
2. method for preparing the described alloy austenitic-bainite ductile iron gear of claim 1, it is characterized in that: with the common new pig iron is raw material, alloying constituent adopts Mn, Cu to guarantee the hardenability of material, the fusing of employing smelting equipment, with the rare earth magnesium ferrosilicon alloy is nodulant, handles back slag making slagging-off, breeds the cast gear blank at twice with 75% ferrosilicon, guarantee that the nodularization rate is 1～2 grade, 6～7 grades of sphere diameter sizes; Gear blank carries out austempering and temper after machining, promptly make automobile rear-bridge spiral conic gear of manganese-copper alloy autenite-bainite nodular iron.
3. the preparation method of alloy austenitic-bainite ductile iron gear according to claim 2 is characterized in that: described smelting equipment adopts cupola and electric furnace double melting.
4. the preparation method of alloy austenitic-bainite ductile iron gear according to claim 2, it is characterized in that: described austempering is that the gear after machining is heated to 870～910 ℃, be incubated 2 hours, the whole temperature of the salt bath of quenching is in 360～375 ℃ the salt bath, to be incubated 2 hours.
5. the preparation method of alloy austenitic-bainite ductile iron gear according to claim 2 is characterized in that: described temper is 310～330 ℃ of tempering 3 hours.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101247878A CN100516593C (en) | 2006-10-17 | 2006-10-17 | Automobile rear-bridge spiral conic gear of manganese-copper alloy autenite-bainite nodular iron and its preparing method |
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| CNB2006101247878A CN100516593C (en) | 2006-10-17 | 2006-10-17 | Automobile rear-bridge spiral conic gear of manganese-copper alloy autenite-bainite nodular iron and its preparing method |
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| CN100516593C true CN100516593C (en) | 2009-07-22 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101713454B (en) * | 2009-12-18 | 2011-08-03 | 吉林圆方机械集团有限公司 | Method for manufacturing driving/driven spiral bevel gear of heavy-duty commercial vehicle by using copper-niobium high-strength austempered ductile iron |
| EP2601320B1 (en) * | 2010-08-05 | 2018-01-17 | Sintokogio, Ltd. | A method for shot peening |
| CN102619957A (en) * | 2012-03-31 | 2012-08-01 | 常熟市迅达粉末冶金有限公司 | Small bevel gear |
| WO2014203610A1 (en) * | 2013-06-20 | 2014-12-24 | アイシン・エィ・ダブリュ株式会社 | Gear and process for producing same |
| CN103331585A (en) * | 2013-07-03 | 2013-10-02 | 扬州扬子江宝云缸套有限公司 | Method for manufacturing isothermal quenching spheroidal graphite cast iron large-scale heavy-load gear |
| CN103320681B (en) * | 2013-07-11 | 2015-10-21 | 周世康 | A kind of austempored ductile iron and quenching technology thereof |
| CN106119682A (en) * | 2016-08-18 | 2016-11-16 | 江阴联华铸造有限公司 | A kind of automobile gear wearable ductile iron part and preparation method thereof |
| CN110106458B (en) * | 2019-04-30 | 2020-06-19 | 中国科学院合肥物质科学研究院 | Heat treatment method of forged manganese-copper vibration damping alloy |
| CN110257695B (en) * | 2019-07-08 | 2020-07-17 | 北京工业大学 | Copper-containing CADI (copper-activated carbon dioxide) wear-resistant material and heat treatment process thereof |
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