1. gravity casting method is to pour aluminum alloy solution into the mold by gravity, and then polish it with lathe to complete the production.
The manufacturing process is simple, the precision casting process is not needed, the cost is low, and the production efficiency is high, but bubbles (sand holes) are easily generated, the density is uneven, and the surface smoothness is not enough.
Many models of Geely are wheels produced in this way, mainly in the early stage, and many new models have been replaced with new wheels.
2. Forging method: the whole aluminum ingot is directly extruded on a 1,000-ton press with uniform density, smooth and meticulous surface, thin hub wall, light weight and the highest material strength, which is more than 30% higher than that of casting method.
However, due to the need for sophisticated production equipment, and the yield is only 50% to 60%, the manufacturing cost is high.
3. The low-pressure investment casting method is adopted to carry out investment casting under the low pressure of 0. 1Mpa. This casting method has good formability, clear outline, uniform density and smooth surface, and can realize high strength, light weight and cost control, and the yield is over 90%.
It is the mainstream manufacturing method of high-quality aluminum alloy wheels.