Method (20) for manufacturing a wheel rim (1) in light alloy such as the following operations: delivering (21) a rough wheel rim in light ally, comprising a wheel disc (two) and an annular portion (three), the annular portion (three) which includes a first (4I) and a second (four e) bead defining a drop properly (C) possessing a initial profile processing (23) the rough wheel rim, modifying the first profile in order to receive a second profile becoming of a decrease thickness than the 1st profile, at least at an intermediate portion (C1) of the drop properly (C), characterized by such as a finishing operation (25) of a surface of the second profile intermediate portion by means of a compression action of stated surface, the finishing operation leaving the low thickness substantially unchanged. With a extremely high mass discharge of media, a huge blast pat tern and a higher work output to energy input ratio, wheel systems have a cleaning rate well in excess of most air blast systems. For instance, the wheel disc and the annular portion are formed by casting in a single piece or alternatively they are made by casting as two separate pieces subsequently united, e.g. welded, to a single an additional.
The weight reduction of the wheel rim obtained by means of such lightening approaches, despite the fact that appreciable, entails on the other hand an raise in the structural complexity of the wheel rim and a corresponding important improve in the complexity of the manufacturing approach. The roll forming machine is applied for the symmetrical or asymmetrical roll forming of wheel rims for passenger vehicles, tractors and building vehicles.
Typically, the wheel rim and disc of passenger vehicles and trucks are connected by welding, whereas large wheel rims and discs for farm cars are bolted …Read More