Investigation of the influence law of EDM electrical parameters on the recast layer in titanium alloys
The recast layer formed on the surface of a workpiece after Electrical Discharge Machining(EDM)significantly im-pacts the surface integrity and mechanical properties of the workpiece.The Recast Layer Thickness(RLT)has become an impor-tant process parameter in EDM,especially critical in EDM of titanium alloys.The RLT is primarily affected by electrical parame-ters.Taking the titanium alloy Ti6A14V as a case,first,the influences law of main electrical parameters(peak current,pulse du-ration,duty cycle,and gap voltage)on the RLT were discussed.Furthermore,based on the impact of the recast layer on surface roughness and material removal rate,an optimized electrical parameter combination was conducted considering multiple objectives including RLT,surface roughness,and material removal rate.Finally,the principles for electrical parameter selection were summa-rized in accordance with different RLT requirements.Experiments verified that while the optimal electrical parameter combination achieved a thin RLT and low surface roughness while realizing an improved 2.76 times material removal rate.
Electric Discharge Machining(EDM)titanium alloyrecast layerorthogonal testgray correlation analysis method
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