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020 _aTHE0006576(Local)
039 9 _a201905161024
_bamirul
_c201110041115
_dFida
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_dVLOAD
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_zida
040 _aUMP
090 _aTJ1191 .H36 2010 rs Bc.
100 0 _aMuhamad Haniffah Ghafar
245 1 0 _aSurface integrity of mild steel in die-sinking electrical discharge machine (EDM) /
_cMuhamad Haniffah Ghafar
246 3 _aSurface integrity of mild steel in die-sinking electrical discharge machine (EDM)
_h[computer file]
260 _aKuantan, Pahang :
_bUMP,
_c2010
300 _axiv, 56 p. :
_bill. (some col.) ;
_c30 cm. +
_e1 computer disc
502 _aProject paper (Bachelor of Mechanical Engineering with Manufacturing Engineering) -- Universiti Malaysia Pahang - 2010
504 _aBibliography : p. 52-53
520 3 _aA comprehensive study of the surface integrity of the machined workpiece in the electrical discharge machining (EDM) of mild steel (AISI 1020) is presented in this thesis. Copper Electrode was used as a tools in this research. EDM is a thermal process that uses spark discharge to erode electrically conductive materials, it’s primarily used for hard metals that very difficult to machine with traditional techniques. EDM tests on a mild steel workpiece were conducted on a sodick AQ55L (ATC) EDM Die-Sinking Machine. The surface Roughness tester Series Mahrsurf XR 20 is used to measure Ra and the surface microstructure was examined with a metallurgical microscopes. The EDM machining parameters those were used were peak current, IP (9A and 18A), discharge voltage (90V and 120V), servo voltage, SV (20V and 60V), pulse on-time (100μs and 300μs) and pulse off-time (500μs and 700μs). The full factorial design of experiment (DOE) from STATISTICA software was used to generate the arrangement of the experiment parameter and the software was used to analyze the effect of each parameter on the machining characteristics. From the analyzed result, peak current, IP and the pulse on-time have significant effect to the Surface Roughness, Ra. The lower values of these two parameters the lower Surface roughness, Ra observed. From the observation on the metallurgical microscopes, it is found there are clearly EDM damaged layer on the workpiece, distinguished by the width and length of microcrack and craters, especially at high peak current, IP and pulse on-time. The surface roughness, damaged layer and micro-cracks seem to decrease when the peak current and pulse on-time were set at very low values.
650 0 _aElectric metal-cutting
650 0 _aMachining
650 0 _aSurface roughness
999 _aVIRTUA40
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