AMF (Advanced Metal Forming) is one variation of rotation forming process that rotates a metal pipe axis and casts the material on the roller.

Generally, the advantage of casting is that it melts aluminum alloy at high temperature and pours into a mold to form as one so the designing flexibility on the disc is pretty high thus it’s easy to mass produce and cost effective. On the other hand, from technical stand point, it’s hard to reduce weight since it’s difficult to form into thin metal. Also what was formed through casting is often uneven and particles are not cohesive therefore its strength is not good enough.

In AMF, first of all, simultaneously cast rim and disc. Secondary, cast disc (= rim material) is to be put through wheel-only spinning processor and roll the rim. It realizes more flexible and tenacious strength by having aluminum material’s crystal and macro formation get further detailed through being forged in this process. As a result, high-strength rim with “stretch strength,” “durability,” and “spread” which are basic characters required for aluminum wheels, is born. Now it is possible to create high-precision rim that is seamless tube as compared to the type that forms a sheet material into a ring through welding.
AMF on disc surface is normally casted, it keeps design-flexibility, but it contributes to reduction of under spring load because the rim-part is spread thin as much as possible by spinning machine.
Such new method of manufacturing process method is AMF which has the merit of both casting and forging.