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    Optimization of Abrasive Water Jet Turning Parameters for Machining of Low Density Polyethylene Material Based on Experimental Design Method
    (Carl Hanser Verlag, 2014) Kartal, F.; Cetin, M. H.; Gokkaya, H.; Yerlikaya, Z.
    Studies to improve the machining of engineering materials have great importance for mechanical systems. Abrasive water-jet turning (AWJT) is a new and effective process for increasing machinability of engineering materials by providing temperature free cutting conditions, high surface quality and having no tool wear problem. In this study, AWJT of low density polyethylene (LDPE) material were investigated in terms of average surface roughness (ASR) and material removal rate (MRR) values and process parameters were optimized by experimental design method. The primary objectives of the study are to investigate AWJT process and system parameters to enhance machinability of LDPE material and to determine optimal processing parameters. Nozzle feed rate (5, 25 and 45 mm/min), abrasive flow rate (50, 200 and 350 g/min) and spindle speed (1000, 1500 and 2500 min(-1)) were analyzed as process parameters. Taguchi L-27 orthogonal full factorial design, optimization box and analysis of variance (Anova) were used for the experimentation and results analysis. Experimental results show that, AWJT process is more efficient in the machining of LPDE material than the conventional machining methods by increasing surface quality and MRR parameters. Minimum ASR and maximum MRR were obtained 1.67 mu m and 14072.02 mm(3)/min respectively; at optimum parameters of 5 mm/min nozzle feed rate, 350 g/min abrasive flow rate and 2500 min(-1) spindle speed.
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    Tensile test specimen preparing three different cutting method influence on the AA 6061-T6
    (BHR Group Limited, 2014) Kartal, F.; Gokkaya, H.; Yerlikaya, Z.; Polat, R.
    Aluminum 6061 (T6) material which is widely used in aviation and defense industries was treated with tensile test in this study. The samples for tensile test were manufactured using three production methods (namely, milling, CO2laser and abrasive water jet (AWJ). Following the tests sample surfaces were assessed for their surface roughness values. Samples which meet the TS EN ISO 6892-1 standard were assessed for their tensile strength, yield strength, percentage elongation and constriction. Among the test samples, sample prepared by milling proved to provide the best surface roughness value (1.32 ?m). The highest tensile strength was obtained from the sample prepared using AWJ while the lowest was obtained from the sample prepared using laser cutting. Samples prepared using abrasive water jet showed 6.57 % difference in terms of tensile strength from samples prepared using milling. © BHR Group 2014 Water Jetting 22.