Study On Rotatary Ultrasonic Aided Electrochemical Drill-grinding With Tube Electrode

Hastelloy X high temperature nickel base alloy is a kind of material belonging to Hastelloy alloy,and its domestic brand is GH3536.It has many excellent physical properties,which make Hastelloy HX widely used in the manufacture of some high temperature aerospace components.SLM laser selective melting technology is one of the most important technologies in the field of metal material increment manufacturing.Hastelloy X high temperature nickel base alloy printed and manufactured by SLM technology can achieve complex shape and excellent performance.In this paper,a new technology of integrated electrolytic ultrasonic drilling and grinding with liquid spray rotating inside the tube electrode is proposed for processing and material removal of Hastelloy X,a Hastelloy alloy printed in SLM,so as to obtain excellent shape and surface roughness,and to optimize the quality problems existing in SLM printing.The main research contents are as follows:(1)Hastelloy printings were prepared and heat treated at various temperatures.The properties of heat treated parts were tested on XOY and XOZ surfaces respectively.The electrochemical properties of the material were tested.The corrosion resistance of the material was optimized comprehensively by using EDS from the angle of element precipitation and EBSD from the change of micro-grain,and the corrosion resistance difference of different surfaces was reduced.(2)The rotating ultrasonic-assisted electrolytic ultrasonic drilling and grinding integrated machining technology test stand was built,and the key components such as abrasive tube electrode and rotating joint in the experiment were designed and manufactured.The machining mechanism of rotating ultrasonic-assisted electrolytic ultrasonic drilling and grinding integrated machining technology was studied.The mathematical model of ultrasonic-assisted electrochemical machining was established and the factors affecting the efficiency and effect of machining were obtained theoretically.(3)Electric field corrosion simulation and ultrasonic flow field simulation of rotating ultrasonic-assisted electrolytic ultrasonic drilling-grinding integrated machining process were carried out by finite element simulation software,and the change rule of machining accuracy during the experiment process was studied.The influence factors and change rule of flow field pressure during the processing process were studied,which provided reference for the design and preparation of subsequent experiments.(4)Pre-experiments were carried out on various parameters in the early stage,and the results were directly used in parameter experiments of rotary ultrasonic-assisted electrolytic ultrasonic drilling-grinding integrated machining technology.The influence factors of electrochemical parameters on the experimental results were studied by orthogonal experiments,and the actual matching between electrochemical machining and grinding in complex machining was studied.The influence of ultrasonic vibration in rotary ultrasonic-assisted electrochemical ultrasonic drilling-grinding integrated machining technology and the change of force during machining were experimented.Finally,by optimizing the parameters,the diameter dimension of 1350+10μm is obtained on 2mm thick workpiece,surface roughness up to 0.649μm machining small holes with good quality improves the efficiency of electrolytic grinding combined processing and guarantees the processing quality.Meanwhile,the processing of 5mm workpiece is explored.