The invention relates to a low-
pressure casting preparing method of an as-cast aluminum
alloy hub. The method particularly comprises following steps of firstly, aluminum
alloy matching and
smelting; secondly, aluminum
alloy refining; thirdly, strengthened aluminum alloy treatment; fourthly, low-
pressure casting forming. According to the technical scheme, aluminum alloy component design,
smelting and refining, an Al-5Ti-B intermediate alloy is added for strengthening the aluminum alloy, meanwhile, the content of
impurity elements of Fe, Ti and Zn is strictly controlled, and the novel high
toughness as-cast aluminum alloy hub free of heat treatment is prepared. The as-cast aluminum alloy hub prepared through the process shows the excellent strength and
plasticity, and use needs are met; according to the low-
pressure casting preparing method of the as-cast aluminum alloy hub, heat treatment is avoided, a large amount of heat
treatment time is saved, and tools, hours and manual work neededby correction after heat treatment are saved,
energy consumption is reduced, the production process flow of the aluminum alloy hub is simplified, the preparing cost is reduced, and the important application value is achieved.