Theses & Dissertations

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https://hdl.handle.net/20.500.14170/1590

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Browsing Theses & Dissertations by Author "Adel Saleh Omar Warregh"
  • Publication
    Optimization of machining parameters in wedm of stainless steel AISI 316 based on taguchi method
    (Universiti Malaysia Perlis (UniMAP), 2016)
    Adel Saleh Omar Warregh
    In this study, the EDM wire cut machine model AQ327L was used to cut the specimens made from AISI 316 based on the selected parameters setting. One thickness of specimens with 6 mm was used and brass wire electrode diameter (0.25 mm). The material removal rate (MRR) was measured by determining the weight difference before and after cutting process (WRW), then divided by machining time. The surface roughness (Ra) was measured by MITUTOYO CS-31 00 device. The experiment is conducted according to Taguchi's L9 OA, with input parameters as pulse on time, wire tension and peak current their response on MRR, Ra and kerf width. Parameter optimization is done by Taguchi method, with criteria maximum MRR, minimum surface roughness and kerf width. The optimum value of SIN ratio of MRR is (19.02 mm3 /min) at value of pulse on time (65JJ.s), wire tension (140gf/mm2 ) and peak current (lOA), while the optimum value of SIN ratio of Ra is (- 7.99JJ.m) at value of pulse on time (65JJ.s), wire tension(160gf/mm2) and peak current (30A). Also the optimum value of SIN ratio of KW is (8.56mm) at value of pulse on time (65JJ.s), wire tension (140gf/mm2) and peak current (1 OA). The percentage contribution of MRR is maximum (65.8%) for obtaining and minimum (3.4%) value. Also, the percentage contribution of Ra is maximum (75.05%), and minimum (9.73%), while the percentage contribution of kerf width is maximum (66.4%) and minimum (4.0%). The result indicate that the pulse on time is the most significant parameter, followed by the peak current and wire tension for both MRR, Ra and kerf width. The predicted value for MRR at optimal parameter sitting is (8. 93 mm3/min) and the experimental average actual value is (8.22mm3/min), so the above mathematical prediction for MRR using MINITAB 17 is validated by confirmation experiment with percentage error (7.9%), while predicted value for Ra is (2.51JJ.m) and average actual value is (2.407JJ.m) with percentage error (4.1 %), but predicted value for kerf width is (0.373mm), and average actual value is (0.365mm) with percentage error (2.1 %). Error observed was within 10% allowed for the results.
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