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Module rack for Mercedes-Benz S-Class convertible made of continuous-fiber-reinforced thermoplastic composite
With the help of continuous-fiber-reinforced, semi-finished thermoplastic composites, structural parts with a large surface area can be designed to be very thin and therefore lightweight. They can also be equipped with numerous functions, as demonstrated by a new module rack, only one millimeter thick, for the S-Class convertible from Mercedes-Benz. Various controllers are mounted on this component. The rack is fabricated in a hybrid molding process from Tepex dynalite 102-RG600(2)/47 %, a continuous-fiber-reinforced, semi-finished polyamide 6 composite from LANXESS subsidiary Bond-Laminates GmbH, based in Brilon, Germany. “The result is a component that weighs about 50 percent less than its aluminum predecessor. What’s more, the low weight and integrated functions simplify assembly, which is an additional cost advantage,” explains Julian Haspel, key account manager at LANXESS.
The module rack measures 0.5 x 0.5 meters and is installed under the trunk. It was developed by Mercedes-Benz Cars Development together with several partners. LANXESS engineered the concept for the mechanical design of the component and calculated various load scenarios. Manufacturer of the module rack Pöppelmann Kunststofftechnik GmbH & Co. KG was responsible for the detail engineering of the component, such as function integration, development of the fully automatic, one-shot, hybrid molding process and component validation. The mold is manufactured by Georg Kaufmann Formenbau AG (www.gktool.ch).
Safe handling of the hot composite insert
“The rack could also have been fabricated in a simple injection molding process. But because of the part’s large surface area, that would have required thicker walls in order to keep the injection pressure sufficiently low. Although this would already have reduced the weight significantly compared to a part made of aluminum, there was still room for improvement,” explains Haspel. Therefore, to go even lighter, the hybrid molding process was selected. It involves a Tepex dynalite blank, which is heated, plasticized and shaped in a one-shot process, and then overmolded with Durethan BKV 30 H2.0, a glass fiber reinforced polyamide 6 from LANXESS. “Despite its size, the soft, hot blank can be handled safely and accurately positioned inside the mold. This contributes to a stable manufacturing process,” says Gregor Efes, structural component specialist at LANXESS.
More cost-efficient than aluminum
The hybrid molding process makes it possible to exploit the advantages of injection molding. For instance, screw bosses, clips, reinforcing ribs and guide elements can be integrally molded in the component. “The clips facilitate assembly, because they eliminate screw connections otherwise required to mount the controllers,” says Efes.
Even complex geometries are feasible in composite design
After successfully concluding the development project, LANXESS is now working with other system suppliers and car makers to implement additional, large-area module racks in a similar composite design. “Thanks to its high stiffness, strength and good draping properties, we also see good application opportunities for Tepex in bracket mounts, which display more complex geometries due to the confined installation spaces,” says Efes looking to the future. In this context, all-plastic parts could offer the additional advantage of better damping properties (NVH: noise, vibration, harshness).
LANXESS is a leading specialty chemicals company with sales of EUR 7.9 billion in 2015 and about 16,700 employees in 29 countries. The company is currently represented at 54 production sites worldwide. The core business of LANXESS is the development, manufacturing and marketing of chemical intermediates, specialty chemicals and plastics. Through ARLANXEO, the joint venture with Saudi Aramco, LANXESS is also a leading supplier of synthetic rubber. LANXESS is listed in the leading sustainability indices Dow Jones Sustainability Index (DJSI World) and FTSE4Good.
This company release contains certain forward-looking statements, including assumptions, opinions, expectations and views of the company or cited from third party sources. Various known and unknown risks, uncertainties and other factors could cause the actual results, financial position, development or performance of LANXESS AG to differ materially from the estimations expressed or implied herein. LANXESS AG does not guarantee that the assumptions underlying such forward-looking statements are free from errors nor does it accept any responsibility for the future accuracy of the opinions expressed in this presentation or the actual occurrence of the forecast developments. No representation or warranty (expressed or implied) is made as to, and no reliance should be placed on, any information, estimates, targets and opinions, contained herein, and no liability whatsoever is accepted as to any errors, omissions or misstatements contained herein, and accordingly, no representative of LANXESS AG or any of its affiliated companies or any of such person's officers, directors or employees accept any liability whatsoever arising directly or indirectly from the use of this document.
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