Abstract
Novel billet design was introduced in an effort to better control material flow during the co-extrusion of bi-metallic shapes and tubes. In order to minimize the amount of material that is extruded “out of geometrical tolerance” (measured by the interface location) as a result of non-concurrent material flow, the core length in the initial billet is shortened. Extrusion was simulated using DEFORM 2D™ finite element modeling (FEM) software and confirmed by actual extrusion experiments on an industrial press. Results for a specific billet geometry extruded using a selected extrusion ratio for plain carbon/stainless steel tubes are presented. It has been shown that by reducing the core length in the initial billet by approximately 10% - 20%, concurrent material flow is promoted and the amount of out of tolerance material is minimized. The presented innovation was first developed for solid bi-metallic profiles made from different aluminum alloys and then applied to bi-metallic ferrous tubes showing general application of the proposed invention.
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Epler, M.E., Misiolek, W.Z. (2015). Novel Billet Design for Co-extrusion of Bi-metallic Shapes and Tubes. In: Tekkaya, A., Homberg, W., Brosius, A. (eds) 60 Excellent Inventions in Metal Forming. Springer Vieweg, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-46312-3_43
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DOI: https://doi.org/10.1007/978-3-662-46312-3_43
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