Experimental Study on WEDM and WECM Compound Machining of Powder Superalloy FGH99
To achieve high-efficiency,precision and surface quality machining of the powder superalloy FGH99,a combined wire-electrical discharge machining(WEDM)and wire-electrochemical machining(WECM)method was proposed.Firstly,the experiment on FGH99 unidirectional traveling WEDM machining was conducted and the effect of pulse width,pulse interval and voltage on machining efficiency,surface roughness and recast layer thickness was examined.Under the optimal parameter combination of pulse width 14 μs,pulse interval 15 μs,and voltage 30 V,a machining outcome of speed 58.41 mm2/min,surface roughness Ra3.628 μm and maximum recast layer thickness 3.09 μm was achieved.On this basis,WECM experiment was carried out under the optimal parameter combination of voltage 40 V,frequency 40 kHz,duty cycle 25％and feed rate 3 mm/min,resulting in a surface roughness of Ra0.3 μm.The result indicated that by optimizing the parameters of WEDM and WECM,high-efficiency machining of FGH99 without a recast layer was realized,which providing a novel idea for the high-performance manufacturing of turbine disk dovetail slots in aero-engines.
WEDMWECMturbine disk dovetail slotpowder high-eemperature alloy
万方数据
维普
