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Race is on to use carbon fibre in a high-volume vehicle


BMW plans to begin high-volume production of carbon fibre parts in two years, making it a strong contender to be the first automaker to move beyond limited-edition use of the exotic material.
But Daimler, which has taken steps aimed at making carbon fibre parts in 2012, is among the automakers racing toward the same goal.
In 2013, BMW will start building the i3 electric car, a vehicle that features a passenger cell – the protective shell around the passenger compartment that ensures the integrity of the vehicle in a crash – made of plastic reinforced with carbon fibre. BMW will produce about 30,000 i3s a year, according to Automotive News Europe.
BMW declined to confirm likely production volume for the i3. But Joerg Pohlman, managing director of the joint venture that produces BMW's carbon fibre, said BMW can make tens of thousands of vehicles.
"We have developed a very flexible production plan," Pohlman said in a telephone interview. "We are prepared to manufacture many more cars if demand is higher than our conservative estimate."
If so, the i3 will be a major breakthrough: a carbon fibre-intensive vehicle produced in volume at a moderate price.
Cutting costs
In 2010, BMW formed a joint venture with SGL Group of Germany to produce carbon fibre reinforced plastics for electric cars.
In the third quarter of this year, a factory in Moses Lake, Wash., will start producing carbon fibre thread, which will be shipped to Germany for conversion into the fabric used to make parts.
To cut costs and allow mass production, the partners are working to perfect a process called resin transfer moulding.
The carbon fibre fabric is placed in a mould, and resin is injected under high pressure and temperature. The process, which once took 20 minutes per part, now requires less than 10 minutes. Robots cut and handle the material and components, which previously were made by hand.
The robots will help BMW achieved big savings. A pound of carbon fibre now costs only a third as much as a pound used in the M3 CSL coupe's roof when the limited-edition car was introduced in the 2004 model year.
More automation
"For the M3, we could afford to have a few workers put the parts in the form," Pohlman said. "We were only making a few thousand a year. But now we'll be making tens of thousands of parts. So there is a whole lot more automation."
BMW is not the only automaker that plans to use carbon fibre. Last year Daimler announced plans to form a joint venture with Toray Industries Inc., the world's largest producer of carbon fibre.
In January, Daimler said the partners will use carbon fibre and other lightweight materials to reduce the weight of a vehicle's body-in-white by 10%. Daimler also indicated the partners will produce components for cars to be launched in 2012. Daimler did not indicate which models would feature carbon fibre, but hinted it would use carbon fibre in the vehicle's passenger cell.

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