Research On Surface Strengthening Processing Technology Of Shaft Parts Based On Ultrasonic Vibration Extrusion

With the rapid development of China's aerospace technology,some of the key components in the environment and load are extremely harsh,in the field of national defense and weapons on the surface quality of components and fatigue life of safe service also put forward higher and higher requirements.The damage and failure of these key components are basically started from the surface of the parts,so the study of new surface strengthening process is of great significance,so a typical type of parts to ultrasonic vibration extrusion strengthening processing technology to study the processing method,process parameters on the impact of material performance and surface quality.The ultrasonic vibration extrusion strengthening processing technology used in this paper is developed on the traditional extrusion,rolling and other processing processes,which uses the ultrasonic system to produce high frequency vibration with periodicity on the tool head,and has the advantages of smooth extrusion process,low force and uniform force on the workpiece compared with other traditional surface strengthening technologies.The ultrasonic system is the key factor in the performance of the strengthening process,and the processing process parameters are the key indicators of the surface quality of the strengthening process,so the design analysis of the ultrasonic system and the optimal design of the processing process parameters are of great significance,and the main contents of the paper are as follows:1)A more comprehensive analysis of the theory and mechanism of ultrasonic vibration extrusion surface strengthening processing,mainly from the metal surface grain refinement mechanism and ultrasonic vibration system dynamics model research analysis,from the theoretical point of view,reveals that ultrasonic vibration extrusion strengthening processing can effectively improve the surface quality of the parts.2)The design and analysis of the components of the ultrasonic vibration system,using ANSYS analysis software to carry out modal and harmonic response analysis of the ultrasonic transducer,to obtain its resonant frequency and output displacement frequency response relationship,from the perspective of numerical simulation to verify the rationality of the theoretical design.3)The finite element numerical simulation of ultrasonic vibration extrusion strengthening on the part surface was carried out using ABAQUS/explicit,and the effect of residual stress distribution on the part surface and static pressure,feed rate and amplitude on it was studied by simulation analysis.4)On the CKD6163 G CNC lathe,the self-developed ultrasonic vibration extrusion machining system is used to machine 304 stainless steel shaft parts,and the orthogonal experimental method is used for research and analysis.In summary,the experimental results of the impact of tool head machining process parameters on the surface quality(including surface roughness and surface hardness of the parts:1)ultrasonic vibration extrusion strengthening processing has a significant effect on the improvement of the surface roughness and surface hardness of the workpiece,and the comprehensive surface quality improvement is about 30%.2)The extrusion depth and spindle speed have a greater impact on the surface roughness,while the ultrasonic power and spindle speed have a greater impact on the surface hardness.(3)The best combination of process parameters was obtained by considering the surface roughness and surface hardness,and the spindle speed was taken as 160r/min,the feed was taken as 0.07mm/r,the extrusion depth was taken as 30?m,and the ultrasonic power was taken as 10 W.