| 摘要 |
A vehicle frame assembly including a pair of side bars, interconnecting crossbars and connecting brackets, all formed from channel sections, is manufactured using a flexible roll former that eliminates the need to use hard tooling. The shorter frame assembly components, including the crossbars and brackets, are formed as multi-piece gang members. The components are hole-punched with numerically controlled piercing equipment, resulting in accurate hole alignment for assembly. For components not requiring offsetting, the component sidebars and bracket and crossbar gang members are preferably heat treated before hole-punching.
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