| 摘要 |
<p>Extruded tubular metal sections are shaped by rolling and used for weldless tyre rims for vehicle wheels. The sections are pref. made from Al-Mg-Si series AA 6000, Al-Zn-Mg-Cu series AA 7000 or Al-Mg series AA 5000 alloy. The rims are pref. produced by dividing an extruded tube into pieces which are progressively rolled into shape. The use of extruded sections simplifies the mfg. process compared to mfr. from plate by rolling, welding, rolling and trimming.</p> |
