| dc.description.abstract | The problem encountered in the traditional machining of tungsten carbide is its superior hardness, which results in a low material removal rate and serious wear of tools. The none-traditional electrochemical machining can be used to conquer the issue. During the electrochemical machining process, there would be an oxide layer adhesion on the material surface. It could obstruct the machining process. The grinding ECM is adapted in this research to remove the oxide layer and enhance the machining process.
The research is divided into two parts. The first part is to investigate the effects of four working parameters, including the grain size of the grinding rod, tool’s rotating speed, concentration of electrolyte, and applied voltage on the machining results. NaNO3 is used as electrolyte. Taguchi - method is used to find out the corresponding influence factor for each working parameter. The second part is to discuss the removal rate and the surface roughness caused by grinding, electrochemical machining and ECG respectively.
Results show that the optimal working parameter is A3B2C3D3, namely Grain size # 170, revolutions 50 rpm, concentration of electrolyte 10 wt%, and applied voltage 8 V. Under this condition, the resulting material removal is 88.44±3 mg, and the surface roughness is 1.33±0.2 μm.
If only electrochemical effect is included, the resulting material removal is found to be 60.02±3 mg, and the surface roughness is 1.41±0.2μm. If only grinding effect is included, the material is hardly machined. Then ECG is better than both ECM and grinding. It indicates that the grinding process in ECG is not the main factor for material removal, but to remove the oxide layer only. | en_US |