Aluminum alloy used for preparing gearbox shell and preparation method thereof

Abstract

The invention relates to an aluminum alloy used for preparing a gearbox shell and a preparation method thereof and belongs to the field of aluminum alloys. Raw materials of the aluminum alloy comprise 9.5-12.5% of Silicon, 2.5-3.5% of copper, 0.5-0.75% of nickel, 3.5-4.5% of magnesium, 7.5-8.5% of zinc, 2.5-3.5% of manganese, 0.9-1.1% of titanium, 1.5-2.5% of chrome, 0.01-0.015% of lanthanum, 0.002-0.004% of yttrium, 0.01-0.015% of samarium and the balance aluminum. The raw materials are heated till the temperature is 775-785 DEG C and then are melted; helium pre-heated for 2-3 min is pumped into the raw materials in a molten condition from the bottom of a container, clinker and dross are removed, then the raw materials in the molten condition are poured into a mould after standing is conducted for 20-30 min, and a primary manufactured shell is obtained; and quenching treatment is conducted at the temperature of 510-515 DEG C, and aging treatment is conducted at the temperature of 160-220 DEG C. The aluminum alloy used for preparing the gearbox shell is good in high-temperature mechanical property and airtightness, and the service life of a gearbox is prolonged.

Description

technical field [0001] The invention relates to the field of aluminum alloys, and in particular to an aluminum alloy used for preparing a gearbox casing and a preparation method thereof. Background technique [0002] In the field of automotive parts, steel plates are widely used because of their high strength, good mechanical properties, and good forming. However, its high density will increase the weight of the entire car, thereby increasing energy consumption. With the continuous improvement of environmental protection awareness in recent years, it is required to reduce the weight of the car as a whole, and the use of steel plates has been greatly restricted. [0003] The proportion of aluminum alloy is only about one-third of that of steel plate, so it is more and more used in the field of automobile parts, but as far as the gearbox housing of automobiles is concerned, aluminum alloy materials are required to have good tensile strength , comprehensive mechanical properti...

AI Technical Summary

Problems solved by technology

In the prior art, if the aluminum alloy gearbox housing can satisfy crack resistance, friction resistance and tensile properties, etc., it will lead to an increase in the overall weight of the car to a certain extent, and the increase in the weight of the car will lead to serious exhaust pollution , is not conducive to environmental protection, and even fails to meet the relevant regulations on automobile exhaust emissions stipulated in the laws and regulations; at the same time, the increase in the weight of the gearbox casing will not be conducive to the heat dissipation of the gearbox casing, thereby affecting the sealing of the gearbox, and resulting in shifting The tank is prone to oil leakage, which is not conducive to the long-term use of the car, the consumption of lubricating oil is large, and the cost of car use increases

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