A new magnesium racing motorcycle wheel could be successfully launched by using the forging and flow-forming technique in combination with the Mg-alloy ZK 60. Due to superior mechanical properties of this wrought alloy a weight saving of almost 1 kg could be achieved in comparison to the magnesium sand-cast version weighing approx. 3,2 kg (wheel size 3,5 x 17). In this special application the anisotropy of tensile properties represents a remarkable benefit. The applied loads occurring in service are parallel to the metal flow direction, so that higher tensile proof stress in metal flow direction could be fully used by reducing the spoke cross section resulting in weight saving. Although full milling of the spokes generally is a time consuming process, the excellent machining properties of Mg-alloys (high cutting speed) help to limit the cycle times and cost respectively. On the other hand the dimension of the forged and flow-formed raw part provides the chance to realise almost every possible spoke geometry without the need to modify the forging tooling. This is advantageous especially for racing applications since the volumes are very low. The wheels are currently used by the Chesterfield Yamaha Tech 3 team for the 2000 world championship of 250 cc series.
Magnesium motorcycle wheels for racing applications
Motorrad-Laufräder aus Magnesium für Rennmaschinen
2000
6 Seiten, 4 Bilder, 1 Tabelle, 2 Quellen
Aufsatz (Konferenz)
Englisch
TecnoMagnesio Magnesium-Alloy Racing Wheels
British Library Online Contents | 1996
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