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3718 |
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Thursday, May 22, 2014, Hall H1 10:40 AM Automotive Industry 2 |
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Quality designed twin wire arc spraying of aluminum bores |
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Johannes König* / Daimler AG, Germany Michael Lahres / Daimler AG, Germany Oliver Methner/ Daimler AG, Germany |
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After 125 years of development in combustion engines the attractiveness is still on a high-level attention today. The efficiency of engines had been increased continuously through numerous innovations during the last years. Especially in the field of motor engineering consequent friction optimizations lead to cost-effective fuel consumption advantages and CO2-reduction. This is the motivation and adjusting lever of the NANOSLIDE®-technology of Mercedes-Benz. The twin wire arc spraying process of the aluminum bore creates a thin, iron-carbon-alloyed coating which will be surface-finished through honing. Because of the continuous development in engines, the coating strategies must be adapted in parallel to achieve a quality-conform serial coating result. The most important factors are the controlled indemnification of a minimal coating thickness and a homogeneous coating deposition of the complete aluminium bore. A specific system was developed for this demands. It enables the measuring and adjusting of the part (e.g. crankcases) and the central plunging of the coating torch into the bore to achieve a homogeneous coating thickness. A pre/after measurement of the bore diameter enables conclusions about the coating thickness. A specific developed software tool for coating deposition can transfer these informations into a model, which predicts the coating deposition as a function of the coating strategy. In this manner tailor-made coating strategies can be created in advance through computer added engineering. |