Flow Formed Aluminum Alloy Wheels is the main method for the production of aluminum alloy wheels. It is filled at a lower pressure (generally 20-60kPa). After the filling is completed, the pressure is maintained for a period of time, then the pressure is released, and the mold is taken out. The process is as shown. This production method can produce high-quality wheels in large quantities, and the solidification process of aluminum liquid is carried out under pressure, so the product qualification rate and utilization rate of aluminum liquid are high, the automation degree of low-pressure casting machine is high, and the labor intensity of workers is relatively low. The production efficiency is high and the cost is slightly higher than gravity casting.
(1) Determination of mold gradient Here, the gradient refers to the tendency of the mold rim cavity portion to be thinned from top to bottom, which is in line with the sequential solidification requirement. the pouring risers of all the low-pressure Aluminum Alloy Wheels are opened in the middle of the hub, and are supplemented by the spokes, and are solidified from the farthest and thinnest portions to the riser, and the thickness is increased toward the riser. The larger, it can ensure that there is a better aluminum liquid feeding channel when solidifying. The rim cavity size is gradually increased from 8.78mm, 9.14mm, 9.9mm to 10.32mm, which meets the gradient requirements.
The size of the rim cavity can be as small as possible on the basis of stable forming, which can reduce the processing amount, retain more dense parts of the crystal structure, and prevent air leakage caused by defects such as shrinkage and shrinkage. At the same time, increase the utilization rate of aluminum liquid and reduce the weight of the blank. When determining the rim thickness and gradient, the rim width is another factor to consider. The larger the rim width, the farther away from the riser, the more appropriate to increase the rim wall thickness and gradient.