Yazar "Ibrahim, Salem A. Basher" seçeneğine göre listele

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    Performance evaluation of the submerged abrasive water jet turning process for improving machinability of castamide
    (Elsevier - Division Reed Elsevier India Pvt Ltd, 2020) Ibrahim, Salem A. Basher; Korkmaz, Seyma; Cetin, M. Huseyin; Kartal, Fuat
    In this study, the submerged abrasive water jet turning (AWJT) system was used for improving machinability of castamide material and process parameters have been investigated comprehensively. Optimum parameters were determined as to minimize the surface roughness and maximize the material removal rate in the submerged turning process of castamide. 3-level traverse speed (TS), abrasive flow rate (AFR) and spindle speed (SS) were taken as the input parameters, and the experimental design was made as a full factorial design. The effect ratios of the input parameters were analyzed statistically by ANOVA and graphical methods, and their interactions were examined by 3D surface images. Optimum test condition was determined by TOPSIS and VIKOR methods. Experimental results were compared with conventional abrasive water jet process. In addition, regression equations were obtained for the explanation of the experimental results mathematically to show the relationships between the variables. According to the experimental results, submerged AWJT increased the surface roughness of castamide material by 15% compared to conventional AWJT and decreased the metal removal rate by 5.22%. ANOVA results showed that the traverse speed is the most effective parameter on the machinability of castamide. Traverse speed was found to be 83.11% effective on surface roughness and 85.56% on material removal rate. According to TOPSIS and VIKOR optimization results, 40 mm/min TS, 310 g/min AFR and 300 rpm SS values were determined as the optimum test conditions. (C) 2020 Karabuk University. Publishing services by Elsevier B.V.
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    SU ALTI AŞINDIRICI SU JETİ SİSTEMİNİN GELİŞTİRİLMESİ VE KESTAMİD MALZEMESİNİN İŞLENEBİLİRLİĞİ İLE PERFORMANSININ İNCELENMESİ
    (2020-11-06) Ibrahim, Salem A. Basher
    This study evaluates the performance of the submerged abrasive water jet turning (AWJT) system, which is used to improve castamide machinability. It comprehensively investigates the concerned materials and process parameters. For minimizing surface roughness and maximizing material removal rate through the mentioned submerged turning process of castamide, we determined optimum parameters. As input parameters, abrasive flow rate (AFR), 3-level traverse speed (TS), and spindle speed (SS) were selected, and the full factorial experimental design was accomplished for this purpose. We statistically analyzed the input parameters’ effect ratios using ANOVA, graphic methods, and 3D surface images and examined their interactions. We used TOPSIS and VIKOR methods to determine the optimum testing conditions, and compared the experimental results to the results shown by the conventional abrasive water jet process. Moreover, we obtained regression equation for mathematically expressing the experimental results, which showed the relations between different variables. Experimental results clearly demonstrated that the submerged AWJT increased the surface roughness of castamide 15% more than the conventional AWJT. It also reduced the rate of metal removal by 5.22%. During the treatment with abrasive water jet, no thermal effect was observed on the surface. We obtained a clean cutting surface, and the sound level reduced to 85dB, which made it environment-friendly. It did not generate any toxic or hazardous substance. The results of ANOVA showed that for castamide machinability, the traverse speed is the most effective parameter. The effectiveness of traverse speed was 85.56% for material removal rate while it was 83.11% for surface roughness. TOPSIS and VIKOR optimization showed 40mm/min TS, 300-rpm SS value and 310g/min AFR, which were optimum test conditions.