VERFAHREN UND VORRICHTUNG ZUR HERSTELLUNG EINES LEICHTMETALL-FAHRZEUGRADES

摘要

2.1 Light-metal vehicle wheels with good emergency running characteristics in the case of a puncture have rim flanges which point radially inwards. The undercut rim flanges must be integrally formed in an additional process step following the casting or forging of the rim preform. If the free space between the rim flange and the wheel disc is very small, backers cannot be used. A considerable amount of waste material arises in the machining of rim preforms which do not have an undercut in the region of the rim flanges. The new method and the corresponding device are intended greatly to reduce the amount of waste material while at the same time giving a high dimensional accuracy of the end product. …2.2 According to the method proposed, a rim preform (2) is first of all produced, the region between the transition from the well base to the emergency-running surface and the outer edge of the rim being designed in such a way that the radially inner faces (7) of this region extend axially parallel and the cross-section of this region thickens outwards in the form of a lobe. This lobe-shaped thickening (3) is compressed radially inwards with the device according to the invention, with the result that the outer rim diameter decreases axially towards the outside from the end of the well base. The undercut for the tyre seating faces (8) is machined out of the material thickened in the form of a lobe. …2.3 Manufacture of light-metal vehicle wheels.