Research On Electrochemical Technology Of Nickel-based High Temperature Alloy

For high strength,good resistance to oxidation and gas corrosion resistance in 650 ~ 1000?,nickel-based superalloy is widely used in aerospace field and the material of the key hot components of a modern aircraft engine,spacecraft and the rocket engine.But the traditional machining method to remove the nickel-based superalloy has not only low efficiency and high cost.For using other electrochemical energy instead of mechanical energy to remove metal material,the machining efficiency of electrochemical machining has nothing to do with material hardness and has no contact stress.Therefore,electrochemical machining is a suitable processing method.However,there are few studies on the electrochemical milling rules of nickel-based high temperature alloys nowadays,so it is of great significance to the research on the electrochemical milling process of nickel-based high temperature alloys.In this article,through electrochemical milling experiment platform construction,the analysis of the basic principle of electrochemical machining and processing conditions of confirmation,the single factor experiment,orthogonal experiment and signal-noise ratio analysis these a few respects,it was investigated to study the electrochemical milling of nickel-based superalloy GH4169.According to the analysis of the basic principle of electrochemical machining,the processing parameters that affect the gap and surface roughness of electrochemical machining are confirmed.Through numerical calculation,it is confirmed to the electrolyte type,the cathode electrode feed speed,the electrode end shapes and other basic processing conditions of electrochemical machining.These conditions provide the theoretical basis for the next electrochemical machining experiment platform construction.Build the electrochemical machining experiment platform,including the layout design of the machine tool,the choice of feeding device and the power supply system,the electrolyte circulating system design and the design of the manufacture control and detection system.The detection method are the threshold value comparison of average voltage.By detecting the voltage value between the Yin and Yang poles,the electrolytic machining status is determined so as to control the electrode movement.With processing speed,the surface roughness and machining gap for processing indexes,studied the influence law on the processing indexes of the four machining parameters that machining voltage,current pressure,electrolyte and cathode feed speed.With machining rate,machining gap,the surface roughness as indexes,studied the influence law of the four processing parameters of the machining voltage,current density,electrolyte pressure and feeding speed of cathode on the processing;By using the method of orthogonal experiment and the signal-to-noise ratio,the processing speed,the surface roughness and machining gap for single objective optimization,obtain the optimal machining gap,the optimal processing speed and surface roughness under the optimal process conditions respectively.