| COMPUTATIONAL SIMULATION |
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| Energy Distribution and Surface Roughness Model in EDM of 8418 Steel |
| YU Jianwu, HU Qifeng, DUAN Wen, HE Lihua, SHEN Xiang
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| College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082; |
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Abstract The surface roughness model in EDM of 8418 steel machined by different electrode materials was established. By combination of experimental method and simulation analysis, surface roughness of 8418 steel was experimentally obtained from copper electrode and CuW70 electrode. Then the diameter and depth of single erosive crater was simulated by ANSYS software, and the surface roughness was calculated based on surface roughness model. By analyzing experimental and simulated roughness, energy distribution coefficient (η) of copper electrode and CuW70 electrode in EDM of 8418 steel could be obtained, which were 33% and 24%, respectively. Finally, energy distribution coefficient and surface roughness model were verified by a series of EDM experiments. The maximum error of surface roughness with different electrode materials was 9.59% by error analysis. It proved that energy distribution coefficient and surface roughness model were accurate. By comparing the experimental and analytical results, the effect of electrode material on energy distribution coefficient could be obtained. The effect of energy distribution coefficient η on the diameter and depth of erosive crater was enhanced with increasing discharge energy. Therefore, the difference between surface roughness using the copper electrode and CuW70 electrode became obvious.
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Published: 25 July 2017
Online: 2018-05-04
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2017, Vol. 31 
