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

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...