Research On Axially Ultarsonic Vibration Assisted Electrochemical Gringing SLM Hastelloy X

Selective laser melting technology,as one of the most popular metal additive manufacturing technologies,has become an important means for the design and manufacture of high-end equipment in the aerospace field due to its ability to achieve rapid and flexible manufacturing of complex components with difficult-to-process materials.However,the forming accuracy of this technology,especially the small hole forming accuracy,severely restricts its further development in the aerospace field.And the traditional subtractive processing technology has a poor processing effect on difficult-to-process materials.To further improve the processing effect of small holes,this article presents an ultrasonic vibration assisted electrochemical grinding technology.And ultrasonic cavitation and liquid phase mass transfer are used to improve the stability of electrolytic grinding.Its features of high efficiency,low machining stress and material reduction provide an important way to realize high-efficiency and high-precision machining of difficult-to-cut materials in aerospace field.In this research,a series of analysis and experimental exploration of ultrasonic vibration assisted electrolytic grinding and reaming on SLM Hastelloy X alloy are carried out.The main study contents are as follows:First,the theory and characteristics of ultrasonic vibration electrolytic grinding processing are introduced,the mathematical model of axial ultrasonic vibration electrolytic grinding processing is established,and the influence of various processing parameters on the ultrasonic vibration-assisted electrolytic grinding reaming is analyzed;a test platform was built,and the cathode(tube electrodes and electroplated diamond grinding heads)and their fixtures were designed and prepared.(2)Secondly,based on the forming machine of SLM125,the effects of different laser powers and scanning speeds on the surface morphology,density and hardness of SLM Hastelloy X alloy samples were explored.Finally,under the parameters of a laser power of 165W,a scanning speed of 1000mm/s,a scanning distance of 100?m,and a layer thickness of 30?m,a sample size of 46mm×24mm×40mm is printed which laid the foundation for the subsequent ultrasonic vibration assisted electrolytic grinding test.(3)The electrochemical workstation was used to analyze the open circuit potential and anodic polarization process of SLM Hastelloy X alloy in the electrolysis process.The polarization curve of the material in different electrolytes and concentrations was tested through experiments.The passivation effect of SLM Hastelloy X alloy was analyzed.And the current efficiency curve was measured.(4)a series of analysis and experimental exploration of ultrasonic vibration assisted electrolytic grinding on forged GH3536 and SLM Hastelloy X alloy for expanding holes are carried out.And the effect of parameters such as pulse supply voltage,feed rate,spindle speed,ultrasonic vibration amplitude and the grinding head grain size on the processing accuracy and processing surface quality are studied.At last,high-quality small holes are machined on the SLM Hastelloy X alloy plate with a thickness of 2mm.