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There are three kinds of aluminum alloy wheel hub manufacturing method: gravity casting, forging, low pressure precision casting.
1. The gravity casting process Using gravity pouring into the mould, the aluminum alloy solution formed by polishing lathe processing, can complete the production. Manufacturing process is relatively simple, do not need precision casting technology, low cost and high production efficiency, but easy to generate bubbles (blister), uneven density, surface smoothness is not enough. Giovanni cobolli gigli has quite a models with is produced by the method of the wheel hub, mainly is the early production model, a new hub for new model has more.
2. One thousand tons of press forging method of the whole piece of aluminum ingots by direct extrusion on mould, benefit is uniform density, surface smooth and detailed, wheel hub wall thin and light weight, strength of materials, the highest three than casting methods as above, but due to more sophisticated production equipment, and yield is only 5 to sixty percent, the manufacturing cost is higher.
3. The low pressure precision casting method in precision casting under low pressure of 0.1 Mpa, this way of casting of good formability, outline clear, uniform density, the surface is bright and clean, can not only achieve high strength, lightweight, and can control the cost, and finished products in more than ninety percent, is the mainstream of high quality aluminum alloy wheel hub manufacturing methods.
