A physical based empirical model for the accumulated strain in novel Metal Continuous Screw Extrusion (MCSE)
Kristian Grøtta Skorpen, Hans J. Roven, Oddvin Reiso
Abstract
This work concerns the novel Metal Continuous Screw Extrusion process (MCSE). The process gives new opportunities for processing metal alloys, composites and novel multi-materials. By principle, one feeds granulated material into the screw extruder which compacts and extrudes the material in a continuous manner. The inherent deformation is very complex and based on empirical knowledge, a comprehensive quantitative model for the strain evolution through the main four stages of the process is formulated for the first time.Data from screw extrusion of an Al-5%Mg alloy using an extrusion die temperature of 410 °C and relatively low feeding rate, showed a total accumulated strain ∼15 in the current prototype set-up for a Ø10 mm profile. Granule feeding rate and screw rotation speed are considered the most influencing parameters regarding predicted accumulated strain. The latter increases with lower feeding rates and higher rotation speeds of the screw. Further design optimization of the screw extruder might be assisted by the current model.