CompositesWorld
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NEWS 29 CompositesWorld.com Fig. 8 Subassembly preparation Multiple CFRP-containing subassemblies are prepared for attachment to the Carbon Core BIW, like this one that contains the RTM roof rail (top), sills and hybrid B-pillar (bottom and center but CF on downward face of both) and SMC reinforcement for C-pillar (far right). Source | BMW AG "ree parts per shift are pulled from each station and tested either nondestructively or with light force to ensure strength." Tunnel assembly cell Trolleys with CFRP and metal parts are loaded into the auto- mated production cell. A Kuka robotic arm picks up a CFRP tunnel and rotates it beneath a mix, meter and dispense (MMD) nozzle for application of epoxy adhesive (Fig. 7, p. 28). e part is then placed under a set of cameras for a quick QA check of adhesive placement vs. a reference. "ere must be no interruptions in the length, and it also checks the width of the adhesive bead," explains Roth. "It doesn't worry about the thickness because we apply more adhesive than necessary and also use spacers, which maintain the distance between the parts for uniform bondline thickness." Fig. 9 Carbon Core takes shape Assembly proceeds as the BIW passes through subsequent stations for attach- ment of side assemblies (shown here). Other subassemblies are robotically lowered into position and fastened or welded until Carbon Core completion. Source | BMW AG BMW 7 Series Plant