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Reveal The Domestic Truck Aluminum Wheel Manufacturing Process, Which You Know?
Jun 06, 2017

In recent years, due to rising international oil prices, countries are developing lightweight trucks, with a view to reducing fuel consumption. Therefore, aluminum-magnesium alloy is increasingly used in the truck. Forged trucks, the weight of the aluminum wheels is 50% lighter than the iron rims; the strength is 5 times higher than that of the iron rims. It has the advantages of quick heat dissipation, high roundness, good dynamic balance, good handling and beautiful appearance. Therefore, the United States and Japan and other developed countries more and more trucks will be replaced by iron wheels forged aluminum alloy wheels.

Followed by a variety of processes aluminum wheels came into being.

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The aluminum alloy wheel manufacturing process

1, aluminum alloy rim material

A356 is a cast aluminum alloy, which is Al-Si-Mg alloy, contains a large amount of Si (content 6.5-7.5%), so that A356 aluminum alloy with good liquid flow and integrated casting performance. However, the impact of such aluminum alloy weakened. Cast aluminum alloy wheels is the use of such aluminum silicon magnesium alloy production.

6061 alloy is a deformation of aluminum alloy, which is usually said forged aluminum alloy, because of its liquid flow is not required, and its solid deformation requirements are relatively high, so its Si content of 0.4 to 0.8%. So its impact resistance is much stronger than the A356 cast aluminum. Most of the forged aluminum alloy wheels are forged with 6061 alloy.

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2, aluminum alloy wheel production process can be divided into casting, forging and between casting and forging between the manufacturing methods.

(1) aluminum wheel casting process
A356 aluminum alloy melting - degassing - casting - forming - T6 heat treatment - machining - surface treatment.

Gravity casting aluminum wheel of the process is to melt the molten aluminum from the mold on the gate directly into the mold cooling molding. This simple casting method, mold cost is low. However, the pouring mouth is relatively large, aluminum consumption is large; pouring easily into the gas and impurities, flow and temperature stability is poor, therefore, casting defects are more. On this basis, developed from tilting casting weight can reduce these defects.



Low-pressure casting aluminum wheel process, is in the mold below the aluminum liquid insulation furnace, through the riser directly through the aluminum liquid through the air pressure into the wheel model, the principle and the pressure type hot water bottle similar. This way the temperature and speed stability, will not be gas and impurities into the mold, therefore, casting defects are less. As the riser is almost no, aluminum consumption is relatively small. On this basis, the development of differential pressure casting and atmosphere protection casting can reduce casting defects to a minimum.



(2) forging manufacturing process

6061 aluminum alloy round bar - cut according to the weight of the rough section - heated to about 400 degrees - more than 8,000 tons of forging machine for 3 to 4 times forging the initial molding - strong spinning machine final cold forming - T6 heat treatment - machining - surface treatment.


Through the aluminum alloy forging high density, grain refinement and showing a fibrous structure, its hardness, tensile strength, yield strength and other mechanical properties and strength greatly improved. At the same time, to avoid the casting of aluminum alloy loose, stomatal, poor impact defects. Therefore, the same specifications of the forging aluminum alloy wheel mechanical properties than casting rounds about 30% higher, while the weight can be done lighter than the latter about 20%.

 

In addition, forged aluminum rims silicon content than casting aluminum wheels less, the density. Therefore, forged aluminum rims conductivity and thermal conductivity are better than casting aluminum wheels. Therefore, the forged aluminum rims can be finely colored by anodic oxidation; the thermal conductivity is better able to reduce the damage of the puncture and brake system.