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Four kinds of forging methods of saving oil and durable aluminum wheels

Forging


Forging is one of the earlier forming processes for aluminum wheel hub applications. Forged aluminum wheels with high strength, good corrosion resistance, size accuracy, the advantages of small amount of processing, under normal circumstances its weight is only equivalent to the same size steel wheel 1/2 or lower. Forged aluminum wheel grain flow direction and force the same, its strength, toughness and fatigue strength are significantly better than the cast aluminum wheel hub.

At the same time, the performance is very reproducible, with almost the same mechanical properties of each hub. Forged aluminum wheel typical elongation of 12% to 17%, which can well absorb the road vibration and stress. Cast wheels usually have a fairly strong ability to withstand compressive forces, but the ability to withstand impact, shear and tensile loads is far less forged aluminum wheels. Forged hubs have a higher strength-to-weight ratio.

In addition, the surface of the forged aluminum wheel holes, which has a good surface treatment capabilities, not only to ensure uniform coating, combined with solid, but also color. The biggest drawback of forging aluminum wheels is the production process more, the production cost is much higher than the casting.


Casting forging method


It is cast as a forging process blank use, its plastic processing methods. Because forging is the final forming process of the part, casting defects can be eliminated, the structure of the product can be improved, the mechanical properties of the product can be greatly improved compared with the castings, the advantages of the casting process in forming complex parts can be fully exerted, the shape is complicated Forging products to reduce the process, the material utilization greatly increased, lower production costs.

Casting forging technology to produce aluminum wheels, the performance can be achieved forging mechanical properties, but the cost of production can be reduced by 30% than ordinary forgings. At present, since the process was successfully applied to mass production in September 1996, it has been adopted by many Japanese companies and has achieved good economic results. At present, only a few enterprises in mainland China (mainly in Taiwan's VIET system) are adopting this technology and their equipment and technologies are from Bulgaria.

Semi-solid forging process


The so-called semi-solid die forging, semi-solid blank is heated to about 50% of the liquid phase of the semi-solid state after a forging forming, access to the desired size of the finished part of the process, which is between a solid state and New process between liquid forming.
The advantages of semi-solid forging: parts in the mold shrinkage is small, easy to nearly final shape, reduce the amount of machining; semi-solid die forging surface smooth, dense internal organization, fine grain, higher mechanical properties than the die-casting and extrusion Casting; forming is not easy to wrap, macro porosity and porosity is much less than conventional castings; forming temperature is low, the mold long life.
In the recent 10 years, semi-solid forming technology has been widely used in foreign countries and has gradually become a new field competing in the advanced industrial countries. It is considered by experts and scholars as a new generation of emerging metal forming technology in the 21st century. It is estimated that for a long period of time, the main market for semi-solid forming is the automobile industry. The most successful and most widely used automotive aluminum alloy parts are applications.
The United States has built a number of aluminum semi-solid die forging factories, of which the United States AEMP Company and Superior Industries Corporation in 1992 in Arkansas, built the world's first semisolid die-forged aluminum alloy car hub factory. Semi-solid die forging instead of low-pressure casting production ZL101 aluminum alloy wheel hub, not only can reduce the amount of machining and improve productivity, but also can improve the mechanical properties and reduce the quality.

Forging spinning


Compared with the high-end forming process, currently only about 10% of domestic enterprises adopt the process for production. The products are mainly supplied to domestic and international buses, trucks and high-end sedan markets. The advantage is that the inner quality of the product is good and the strength of the product is high and the quality is light. The disadvantage is that the equipment cost is high, and the spoke shape of the product manufactured by the traditional forging process can only be finished by milling, and the metal utilization rate is low and the production efficiency is not high. Forging sub-traditional forging and grinding forging, grinding forging directly forged spokes shape.