Browsing by Author "Bersisa Tufa"

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    Enhancing Abrasive Grinding Performance of Al -7075 Alloy Through Carburizing
    (Addis Ababa University, 2024-06) Bersisa Tufa; Desalegn Wogasso(PhD)
    As compared to other metals aluminums are difficult to work on grinding operation because of its ductility and low melting point. This thesis paper deals with the validation and optimization of enhancement of grinding machinability of aluminum alloy by one of precipitation hardening process called carburization, which is mainly about the ingression of carbon molecules to the aluminum alloy for formation of aluminum carbide surface layer. The machinability is measured and characterized by the material removal rate and roughness by considering the influence of machining parameters and material properties such as wheel speed (1800, 2000RPM), work hardness (88, 109, 171VHN), cutting depth (0.02, 0.04,0.06mm) and surface depth (0mm, 1mm, 2mm). The roughness measurement was carried out on digital roughness tester SURFTEST SJ-310 and the material removal rate is calculated. The roughness and material removal rate results are then gathered and analyzed using Minitab 19 commercial software to determine the rank and percentage of the effects and interaction of machining parameters and material properties with the roughness and material removal rate were analyzed. According to the analysis using the signal-to-noise ratio (S/N ratio) to identify the control factor settings that minimize the variability caused by the noise factors on the material removal rate are surface depth, work hardness, wheel speed and cutting depth ranked respectively with highest delta value difference and for surface roughness work hardness, wheel speed and cutting depth and surface depth, ranked respectively. By using grey relational analysis, the optimum machining parameters also set on cutting speed at 2,000RPM, material hardness at 171 VHN, Surface Depth 2mm from surface and depth of cut at 0.04mm to have higher material removal rate and minimum roughness measurement 26.092 mm3/sec and 1.208μm Ra achieved respectively. The experimental and analysis result shows that the properties improved by the solution heat treatment or carburization have a high positive impact on the grindability of aluminum, by recommending identification research of associated mechanical property changes it is evaluated in this research as a better manufacturing process for reduction of clogging on the wheel and frequent dressing requirements.