Major automotive tier supplier moving to composites
A well-known Tier 1 supplier to the auto industry, Cooper Standard (Novi, MI, US) employs more than 30,000 employees at 120 facilities worldwide, and is the largest global supplier of automotive sealing systems.
A well-known Tier 1 supplier to the auto industry, Cooper Standard (Novi, MI, US) employs more than 30,000 employees at 120 facilities worldwide, and is the largest global supplier of automotive sealing systems. It also produces fuel and brake systems, fluid transfer systems and anti-vibration systems (AVS). And the big news is that in the AVS category, Cooper Standard is undergoing a significant materials shift from well-established, legacy metals to composites.
“These are big, sturdy traditional parts that have been made for more than half a century,” notes Joe Emmi, Cooper Standard VP and managing director global AVS, referring to AVS body, strut and engine mounts typically formed from cast aluminum, stamped steel and rubber. “Our corporate mission is to innovate and provide superior products,” he points out, “and thanks to advances in material science and design, the composite parts we’ve developed can now pass all of our tests.”
He calls out three factors that have motivated Cooper Standard’s move to fiber-reinforced plastics:
1) A growing demand from consumers for more comfort (in this case, less vibration) in both cars and trucks.
2)A need to reduce weight for OEMs for both better fuel economy and to accommodate more amenities.
3)A growing acceptance from OEM customers for new structural composite part designs, if they can meet performance criteria.
The criteria are substantial for these structural parts. For example, Emmi explains that body mounts, which attach a passenger vehicle’s body to the structural frame, come in two types: conventional steel and rubber mounts and hydraulically damped mounts. The hydraulic mounts conduct fluid between two internal chambers to develop damping and improve the ride response of the vehicle. These mounts have typically been developed using stamped steel or cast aluminum housings, but they have now been replaced with composite plastics: “We converted one of our hydro mounts, originally a rubber sleeve inside a steel housing, to a glass-reinforced nylon composite.” He points out that in addition to saving significant weight, the composite housing meets customer performance requirements. “These are critical parts that must secure the body firmly to the frame,” he adds. “Our customer understandably was a bit worried about the composite design, but we have demonstrated that it works.”
Another example in composites, also developed under Cooper Standards’ DynaFib Innovation Program, was conducted in partnership with a university and a composite materials supplier for a European OEM. In this case, says Emmi, “the strategic effort was aimed at advancing the process as well as the material and part design.” DynaFib sought to extend the applicability of plastic bracketry by providing increased tensile strength at a significant mass savings. The group worked with Coriolis Composites (Queven, France) on an automated process that loops a continuous glass/thermoplastic fiber over two torque isolation mounts, with the continuous fiber designed to handle peak engine torque loads. The loop and mounts are then overmolded with polyamide. Emmi explains that the composite torque strut mount, designed to work within an engine mount system, weighs 50% less than the legacy aluminum part, and offers better tensile strength than a metallic solution. We’re targeting introduction on a 2019 model year vehicle.” He adds, “We’re replacing metals with composites in our AVS business in parts that require high tensile strength, like brackets, torsional displacement arms and strut mounts.”
There are numerous methods for fabricating composite components. Selection of a method for a particular part, therefore, will depend on the materials, the part design and end-use or application. Here's a guide to selection.
Approaching rollout and first flight, the 787 relies on innovations in composite materials and processes to hit its targets
Lightweight, hard and stable at high temperatures, CMCs are emerging from two decades of study and development into commercial applications.