RESISTIVE-LASER HYBRID SOURCE FOR FFF PRINTING PROCESS

Remus SOCOL, Iulian ȘTEFAN, Traian ȚUNESCU, Cristian CHIHAIA, Nicușor-Alin SÎRBU, Ionel-Dănuț SAVU

Abstract


Some authors have reported the use of hybrid sources for heating the materials to be processed in various joining or sintering situations. The paper presents exploratory research on the use of a hybrid heating source, consisting of a resistive extrusion head and a defocused laser beam, to heat the material deposited in 3D printing by the FFF process. This hybrid source aims to reduce the cooling rate of the deposited material to improve the joining between two successive layers. It was also aimed at improving the degree of filling through an estimated flattening of the deposited filament. A simulation of the action of the hybrid heating source was carried out to determine the process parameters. A thermally stressed geometric model similar to the real situation was made. The thermal fields were simulated for different positions of the hybrid source on the part surface. When the temperatures estimated to achieve the proposed ones were reached, the thermal system data were taken and transferred to the physical 3D printing system. Deposits were made with these parameters, measuring the temperature values at various points of the thermal field on the surface of the part. The measurements confirmed the geometric model required by the simulation of the real thermal field. The samples made were visually analyzed and it was concluded that the deposit no longer has a circular section, but has flattened, which confirms the initial estimates: the degree of filling has increased by x%.


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