Performance evaluation of copper and graphite electrode in electrical discharge machine (EDM) of aluminium alloy LM6

Laily, Suraya (2016) Performance evaluation of copper and graphite electrode in electrical discharge machine (EDM) of aluminium alloy LM6. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Electrical discharge machining (EDM) which is very famous among the non-conventional machining methods is expected to be used quite extensively in machining aluminium alloys due to the advantages that it can offer. This thesis is to study on the influence of operating parameters of LM6 (Al-Sil2) on machining characteristics such as material removal rate, electrode wear rate, surface roughness, surface hardness thickness of recast layer. Copper and graphite were selected as electrode with positive polarity. The experiment was done using SODICK AQ35L EDM machine. Three level approach of Taguchi Method Design of Experiment (DOE) was applied to design the experimental table of trials, analyze the significant factors that affecting the machining characteristics for EDM process. Total of 27 experiments were conducted included 3 time repetition of every run. The weight of electrode and workpiece were measured before and after machining using weight scale and surface roughness tester was used to measure the Ra for each specimen. Scanning Electron Microscope (SEM) has been used to measure the thickness of recast layer while Vickers Hardness tester was used to measure surface hardness of workpiece material. The experimental data was analysed by using ANOVA analysis and the optimal combination of the process parameters can be predicted. From the usage of copper electrode, it can be conclude that peak current was significantly affect material removal rate (MRR), electrode wear rate (EWR) and surface roughness (Ra) and surface hardness (Hv).While pulse on time mainly effected thickness of recast layer by using copper and graphite electrode . Meanwhile, by using graphite electrode, peak current also mainly affected material removal rate, electrode wear rate, and surface roughness. Moreover, surface hardness was affected by peak current while others parameters which are voltage, pulse on time and pulse off time gave equally affect on surface hardness of the workpiece.

Item Type:Thesis (Masters)
Subjects:T Technology > TJ Mechanical engineering and machinery > TJ1125-1345 Machine shops and machine shop practice
ID Code:8781
Deposited By:Mr. Mohammad Shaifulrip Ithnin
Deposited On:24 Jan 2017 11:50
Last Modified:24 Jan 2017 11:50

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