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September 28, 2020 11:48 AM

Nissan adopting compression molding to bring CF to mass production

Hans Greimel
Automotive News
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    Nissan Motor Co. Ltd.
    Nissan says that by adopting compression molding for carbon fiber, it can reduce costs and production time, allowing it to use carbon-fiber-reinforced plastic in its cars.

    Tokyo — Nissan Motor Co. Ltd. has long reserved costly carbon-fiber-reinforced components to such applications as the hood and roof of its low-volume, high-performance GT-R sports car. But thanks to a production breakthrough, Nissan says it will soon deploy the lightweight material in mass-market models.

    By adopting compression resin transfer molding, Nissan speeds the process by allowing resin to flow into the woven carbon fiber more quickly and thoroughly permeate the material when it is being pressed between two dies in the mold.

    The process slashes the time and cost needed to make parts out of carbon fiber, the Tokyo-based automaker says. Deploying it will help Nissan trim about 176 pounds, on average, from future vehicle weights.

    Company executives say Nissan needs to broaden its use of carbon fiber to help it meet increasingly stringent fuel economy rules. Lighter vehicles require less energy to be propelled, and slimming down is an important way to offset the weight of heavy batteries as automakers electrify lineups.

    "In the past, we used to apply [carbon-fiber-reinforced plastic] to a limited number of models. But going forward, we would like to apply it to mass production," said Hideyuki Sakamoto, executive vice president for manufacturing and supply chain management. "And now we have visibility to do that."

    Nissan Motor Co. Ltd.
    Nissan is looking at parts such as B pillars for use of carbon fiber.

    The advance comes in the molding process of carbon-fiber components, reducing the time needed from the current 10 minutes to about two minutes. And the use of better computer simulations halves development time to create part dies, adding to the cost savings and timesavings.

    Nissan plans to use the manufacturing technique to make carbon-fiber B-pillars for a large SUV that will hit the market in 2024 or 2025, Sakamoto said. He did not name the product, but a redesign of the Armada large SUV is expected around then. Nissan has said it needs to lightweight its heavier vehicles to better comply with future emissions standards.

    Compared with compression molding, Nissan previously used a vacuum to spread the resin, which took longer. The new method does not compress the two dies initially. Instead, it keeps a gap of a couple millimeters between them that allows the resin to spread.

    Using compression resin transfer molding also delivers better-quality parts with less wrinkling and fewer weak spots, which are caused when the resin hardens before it completely permeates the carbon-fiber sheet.

    Even though Nissan has already developed the technique, Sakamoto said he wants to further refine the process and reduce costs before leveraging it in the upcoming production vehicle.

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