Analysis and design of screw parameters in process of mixing and extruding functionally graded materials
In this article,in order to solve the uneven transition in the process of mixing and extruding functional gradient materials prepared by the micro-flow extrusion process,the mathematical model of the relationship between the volume flow rate and the material rheological characteristics,the screw structure parameters and the screw rotational speed in the mix-and-extrusion process is set up,and the analytical relationship applicable to the screw design of mix and extrusion for 3D printing of functional gradient materials is identified.The screw structure and the correlation between the parameters are explored;the influence of the design parameters on the working performance is analyzed;the distribution law of the functional gradient materials mixed and ex-truded in the screw groove is worked out,in which the screw rotational speed is the main influencing factor of the volume flow rate,and the groove depth and the screw angle are the key factors for forming the stagnation zone in the slurry-mix process.Final-ly,the mix-and-extrusion experiments are verified by means of the screw structure with specific parameters.The results show that the optimized screw parameters can ensure the forming effect of printed parts with a certain volume flow rate,and provide theoreti-cal support for the optimized design of mix-and-extrusion screws.
3D printingfunctionally graded materialmix and extrusionanalysis on screw parameters
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