Lamborghini Is Forging Ahead with Forged Carbon Fiber, We Visit Their U.S.-Based Lab

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Thirty-five years ago, McLaren revolutionized both motorsports and the car world at large. Drawing on lessons learned from aerospace, McLaren introduced the first Formula 1 racer with a carbon-fiber-composite (CFC) tub in place of a bonded and riveted sheet-aluminum structure. The success of that venture in turn enabled the aptly named McLaren F1 sports car with a molded CFC monocoque serving as its passenger cabin and structural core.

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Since then, the technological trickledown has continued, drip by drip, from aircraft to racecars to supercars, and, recently, to affordable road cars. At this year’s New York auto show, Toyota introduced its Prius Prime plug-in hybrid equipped with a CFC rear hatch, enabling an 8-pound weight savings over the standard stamped-and-spot-welded-steel alternative.

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The drips reached Italy in 1983 when engineer Rosario Vizzini returned to his homeland convinced that the aircraft-manufacturing techniques he learned at Boeing could trim mass and improve performance at Lamborghini. A CFC-intensive Countach Evoluzione prototype was constructed, followed in 1985 by the first Kevlar-reinforced body panels for the Countach Quattrovalvole. By 1990—two years before the launch of the McLaren F1—CFC had spread throughout the Lamborghini lineup. The Diablo was the first to mix CFC and steel tubing in a hybrid structural role. Today’s Aventador coupe and convertible have a core structure consisting only of molded CFC.

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The collaboration between Lamborghini and Boeing on composite-materials research dates back to the early 1980s and the 767.

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Unfortunately, slow manufacturing methods inhibited the advancement of this technology into mainstream automobiles. Taking the next step in 2007, Lamborghini returned to Seattle, Washington, Boeing’s home base, to form a liaison with the University of Washington’s department of aeronautics and astronautics. UW professor Paolo Feraboli, who had worked at Lamborghini in Italy in 2001 and 2002, began adapting the latest aircraft production methodology to car-world needs.

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The traditional means of making CFC parts is to place woven carbon-fiber cloth impregnated with resin into a single-sided mold, layer by layer. This is a tedious process requiring high skill levels and extensive labor. The mold and CFC material are then loaded into a vacuum-pressure cooker called an autoclave where the part is baked like a Thanksgiving turkey, a process can take up to 24 hours. The cycle time can be significantly reduced by loading the carbon-fiber material in dry form and injecting the resin at high pressure inside a closed (two-piece) mold. Mubea Carbo Tech in Salzburg, Austria, uses this resin-transfer method to mold ‘monocell’ tubs for McLaren’s current range of two-seat supercars.

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Lamborghini is attempting to replace forged-steel parts with significantly lighter forged-composite ones, such as the connecting rods shown here before and after trimming and machining.

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Feraboli had a better idea: eliminate the autoclave. What he and Lamborghini patented as Forged Composites (FC) technology simplified and expedited the molding process. Step one: load chopped, randomly oriented carbon fibers impregnated with resin into a two-piece steel mold. Step two: apply heat and 1200-1500 psi of pressure. After only three minutes, the CFC part is cured and ready for removal from the mold and trimming. It took eight years to develop this process to make the 1000 or so window frames, gussets, and rib reinforcements that go into each Boeing 787 Dreamliner. The difficult part was convincing the Federal Aviation Administration that this manufacturing method—starting with what’s called chopped-carbon sheet-molding compound—is viable. Transferring it from the 787 to Lamborghinis was comparatively easy.

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In 2010, at the Paris auto show, Lamborghini unveiled the Sesto Elemento concept car to showcase its FC breakthrough. The structural tub, exterior panels, and suspension control arms—80 percent of the car by weight—were made using FC methods.

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Feraboli left UW in 2013 to establish Lamborghini’s Advanced Composites Structural Laboratory (ACSL) in Seattle’s Interbay district. This 8000-square-foot facility, currently staffed with five employees, liaises with a 60-person Advanced Composites Research Center at Lamborghini’s Sant’Agata Bolognese, Italy, home base. ACSL also advances the carbon-fiber cause by performing tests for various aircraft and sports-equipment manufacturers, by conducting one-to-five-day training sessions, and by housing a scale-model Lamborghini museum.

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Lamborghini currently offers a forged-composite interior-trim package for the Huracán, including air vents like these.

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Maurizio Reggiani, Lamborghini board member responsible for R&D, calls FC tech the company’s “workhorse” that eventually will serve many structural, body-panel, and cosmetic-trim needs. One issue he faces is marketing a different aesthetic—what looks more like marble or burl wood versus the traditional black woven fabric—to his supercar constituents. To encourage acceptance, FC parts already are infiltrating production models. The first semi-structural component is a painted, removable roof panel for the Aventador convertible. FC engine bay trim is available as a $7000 option on the Huracán. An interior package consisting of four air vents, sill plates, door pulls, and center-console trim with the FC look under a gloss clear coat soon will be offered.

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• If 3D-Printed Carbon Fiber Is the Future, It’s Already Here

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• The Next Frontier In Carbon Fiber: Forged Composite

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• Beyond Carbon Fiber: The Next Breakthrough Material Is 20 Times Stronger

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The forged part of the FC name comes from the goal of replacing metal forgings in cars. While FC suspension control arms and wheels are risky because it’s difficult to tell when they need to be replaced due to pothole or curb-strike injury, the ACSL has FC engine connecting rods in its showcase that may be closer to fruition. The most promising candidate delivers a 39-percent weight savings over a forged-steel design for that part.

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Reggiani and Feraboli would love to see the fruits of their labors embraced by other brands both inside and out of the auto industry. Perhaps it’s a coincidence that Feraboli’s daily driver is a 2015 Corvette Stingray, but the next generation of that sports car seems like an ideal place to extend FC’s reach. Knowing how picky the Corvette engineering team is, if Lamborghini’s technology earns Chevy’s approval for use in the coming $80,000 mid-engine Corvette, forged composites will have become the poster child for cost-effective weight savings.

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from Car and Driver Blog http://blog.caranddriver.com/lamborghini-is-forging-ahead-with-forged-carbon-fiber-we-visit-their-u-s-based-lab/