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Automobile rear-bridge spiral conic gear of manganese-copper alloy autenite-bainite nodular iron and its preparing method

A technology of spiral bevel gear and austenitic ductile iron, which is applied in belt/chain/gear, mechanical equipment, manufacturing tools, etc., can solve the problems of consumption and large energy, and achieve the expansion of sources, good isoquenching process, and convenient production. Effect

Inactive Publication Date: 2007-03-28
WUHAN UNIV OF TECH +1
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  • Description
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AI Technical Summary

Problems solved by technology

In addition, the manufacture of 20CrMnTi alloy steel gears requires a series of processes such as smelting and rolling (forged steel profile production), forging and long-term carburizing and quenching heat treatment, which consume a lot of energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Operation method: use ordinary new-born iron as raw material, the alloy composition is C 3.5-3.7%, Si 2.6-2.8%, Mn 0.6-0.8%, Cu 0.7-0.9%, <0.06%P, <0.02%S, the balance is iron. Double smelting with cupola furnace and electric furnace, rare earth magnesium ferrosilicon alloy as nodulizer, slag removal after treatment, and 75% ferrosilicon for inoculation and casting of gear blanks twice (EQ140 automobile rear axle spiral driving bevel gear and driven bevel gear), the guaranteed spheroidization rate is 1-2, the ball diameter is 6-7, the gear blank is heated to 870-910°C after machining, kept for 2 hours, and the final temperature is 360-375°C after quenching into the salt bath In a salt bath, keep warm for 2 hours, and then temper at 310-330°C for 3 hours to make a manganese-copper alloy Aube ductile iron automobile rear axle spiral bevel gear.

[0023] Technical indicators: the retained austenite content is 25-35%, and the mechanical properties are σ b 1035~1088MPa, δ6...

Embodiment 2

[0025] Operation method: except that Mn is 0.8-1.0%, and Cu is 0.5-0.7%, other is the same as embodiment 1.

[0026] Technical indicators: the retained austenite content is 25-35%, and the mechanical properties are σ b 1020~1100MPa, δ6.1~7.6%, α k 70~110J / cm 2 , HRC32~34, HRC37~39 after strong shot peening.

Embodiment 3

[0028] Operation method: except that Mn is 0.4~0.6%, and Cu is 1.0~1.2%, other is the same as embodiment 1.

[0029] Technical indicators: the retained austenite content is 25-35%, and the mechanical properties are σ b 1025~1080MPa, δ6.3~8.8%, α k 85~120J / cm 2 , HRC32~33, HRC36~38 after strong shot peening.

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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 [0001] The invention relates to a manganese-copper alloy Aube ductile iron automobile rear axle spiral bevel gear and a preparation method thereof. Background technique [0002] In 1977, M. Johansson announced that the Karkkila Foundry of Finland's Kymi Kymmene Company had invented ADI (ADI), and applied for patents in 13 countries including the United States, Britain, France, and Canada. This kind of ductile iron has bainitic ferrite and austenite as the matrix structure, which contains 20-40% austenite, which endows this kind of ductile iron with high plasticity and toughness, and has excellent comprehensive mechanical properties. And because austenite has work hardening ability, it can significantly improve its fatigue strength and wear resistance. This material is especially suitable for replacing 20CrMnTi alloy forged steel to manufacture gears, and has the advantages of light weight, low noise, and energy saving. [0003] It is usually necessary to ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H55/17C22C37/00C22C33/08C21D9/32C21D11/00
Inventor 刘生发徐才安廖大军
Owner WUHAN UNIV OF TECH
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