But first things first, because like any other rim of this material the forged wheel also must first be casted. And then there is still the question in what part of the production process the material will compressed. And whether that happens in warm or cold state.
In our first example, a so-called connecting piece is casted, a rough round component which already contains all the material for the later rim. This is then completely compacted and still warm in a way rolled out that the rim arises gradually. Of course, at the end is still needed a superfinishing.
Besides the method, the alloy with higher strength is different from the when casting. It is said that forged rims with possibly higher strength due to lower wall thicknesses have a more favourable weight, particularly important in unsprung masses at running gears of motor vehicles. However, the manufacturing process is more complex.
Not always, the material must be completely compacted. Thus, e.g. after casting when rolling out the still warm rim can also be used a pressure weighing tons, which causes a compaction of the material. The method is called 'Flow Forming Process' or 'Quenching Manufacturing' because after a few hours at temperatures above 500° C, the wheel is cooled relatively quickly.
No matter, whether only cast or even partly or completely forged, in the final manufacture and testing, the wheels do not differ anymore. Below again the process at a cast wheel with interesting finishing. 10/15
