Browsing by Author "Gökkaya H."

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Effect of abrasive water jet turning parameters on depth of cut of AISI 1050 steel
(2014-01-01) Kartal F.; Gökkaya H.
This study analyzes the depth of cut as an output of experiments using abrasive water jet turning (AWJT) on AISI 1050 steel material and machining parameters were optimized using Taguchi method. Three different nozzle feed rates (0.01, 0.017 and 0.09 mm/min), abrasive mass flow rates (50, 200 and 350 g/min), lathe spin rates (500, 1500 and 2500 rpm), nozzle distances (2,10 and 18 mm) and two different nozzle diameters (0.75 and 1.3 mm) were used as machining parameter values. Taguchi's LI8 orthogonal array was adopted for the test design. The impact of parameters on depth of cut was statistically examined using analysis of variance and S/N ratios obtained. As a result of the tests, Nozzle feed rate proved to have the highest impact on the depth of cut with its rate of 75.38%. Using a 0.75 mm nozzle diameter led to decreased depth of cut. Increasing the spindle speed proved to increase the depth of cut.
Effect of abrasive water jet turning process parameters on surface roughness and material removal rate of AISI 1050 steel
(2015-01-01) Kartal F.; Gökkaya H.
The purpose of this study was to optimize and determine the most important abrasive water jet turning (AWJT) operational parameters, such as nozzle diameter (0.75 and 1.3 mm), nozzle feed rate (5, 25 and 45 min^-1), stand-off distance (2, 10 and 18 mm), abrasive flow rate (50, 150 and 350 g × min^-1), and spindle speed (500,1500 and 2500 min^-1), regarding machining efficiency parameters, namely, average surface roughness Ra (μm) and material removal rate (mm³ × min^-1), using AISI 1050 steel workpieces machined by abrasive water jet turning. Taguchi L18(2¹ × 3⁴) orthogonal experimental design was used for the experimental design. Adequacy of the predicted linear regression model equations was tested using the method of ANOVA. These model equations were used to optimize the operational parameters of the surface roughness and material removal rate. Machinability charts, indicating the optimum processes with respect to the surface roughness and material removal rate for AISI 1050 steel workpieces, were developed and presented in this study. As a result of experimental studies, it is seen that nozzle feed rate proved to have the most significant impact on surface roughness by 48.7 %. Abrasive flow rate proved to have the most significant impact on material removal rate by 84.6 %. Using a nozzle diameter of 0.75 mm, the average surface roughness was improved while material removal rate decreased.
Effects of machining parameters on surface roughness and macro surface characteristics when the machining of Al-6082 T6 alloy using AWJT
(2017-01-01) Kartal F.; Yerlikaya Z.; Gökkaya H.
This study analyzes the effects of machining parameters on the surface roughness and macro surface characteristics when machining Al-6082 T6 alloy of ∅30 and 240 mm in size using abrasive water jet (AWJ) turning processes. The material removal tests were conducted using a computer numerical control (CNC) abrasive jet cutting machine for different parameters of nozzle feed rate (10, 15, 20 and 25 mm·min−1), abrasive flow rate (50, 150, 250 and 350 g·min−1), spindle speed (25, 50, 75 and 100 min−1) and standoff distance (2, 5, 8 and 11 mm). Pump pressure at 350 MPa, abrasive type of Garnet and size of 120 Mesh, and nozzle diameter of 0.75 mm are kept constant throughout the experiments. When macro surface characteristics were analyzed, it was found that increased spindle speed, decreased nozzle feed rate, increased abrasive flow rate and lower standoff distance resulted in smoother surfaces. According to the findings of this study, best results were obtained when spindle speed and abrasive flow rate were increased.
Evaluation of corrugated core configuration effects on low-velocity impact response in metallic sandwich panels
(2024-01-01) Zurnacı E.; Gökkaya H.
Optimization of abrasive water jet turning parameters for machining of low density polyethylene material based on experimental design method
(2014-01-01) Kartal F.; Çetin M.H.; Gökkaya 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 L27 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 lm and 14072.02 mm³/min respectively; at optimum parameters of 5 mm/min nozzle feed rate, 350 g/ min abrasive flow rate and 2500 min^-1 spindle speed. © Carl Hanser Verlag, Munich.