Browsing by Subject "robot"
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Item A Framework for Large Scale Fused Pellet Modeling (FPM) by An Industry Robot(University of Texas at Austin, 2015) Wang, Zhiyun; Liu, Renwei; Sparks, Todd; Liou, FrankFused pellet modeling (FPM) is an important method in additive manufacturing technology, where granular material is used instead of filaments. In FPM, prototypes are constructed by the sequential deposition of material layers. As the size of the part increases, the problem of long build times and part deformation becomes critical. In this paper, methods for eliminating the void density during deposition and accuracy control principles for large scale FPM processes are studied. By analyzing the ab initio principles of this process, a mini extruder with variable pitch and progressive diameter screw for the large scale fused deposition is proposed. Based on polymer extrusion theory and non-Newtonian fluid properties, each of the design parameters are analyzed, such as the length of different function sections of screw, die shape of extruder nozzle, and the material properties. According to these analysis results, an extrusion process simulation for controlling the filament shape is carried out with multi-physics modeling software and proved the FPM could increase the building efficiency and deposition quality for large size parts.Item From Agile Ground to Aerial Navigation: Learning from Learned Hallucination(Proceedings of the International Conference on Intelligent Robots and Systems, 2021-10) Wang, Zizhao; Xiao, Xuesu; Nettekoven, Alexander J; Umasankar, Kadhiravan; Singh, Anika; Bommakanti, Sriram; Topcu, Ufuk; Stone, PeterItem Resource Efficiency of the Robot-Based Hybrid Additive Manufacturing Chain(University of Texas at Austin, 2023) Tepper, C.; Utsch, J.; Zarges, J.; Weigold, M.Combining additive and subtractive metal processes to a hybrid additive manufacturing chain not only enables the production of parts with application-oriented design but also leads to increased resource efficiency especially when combined in an industrial robotic cell. Compared to parts manufactured through subtractive processes from full material the hybrid additive manufacturing chain is considered to be resource efficient due to reduced material consumption. However, the energy consumption of the hybrid additive process is considered higher because of the use of laser for the additive process. It is assumed that the decreased material consumption outweighs the higher energy consumption regarding the resource efficiency but until now it is not investigated. Therefore, in this paper the resource consumption of the robot-based hybrid additive manufacturing chain including the wire based direct energy deposition process and the milling process is analysed through measurements during experiments and compared to subtractive processes using the carbon footprint as a reference.