Vibration characteristics and experiments of thin-walled cylinders in turning process with time-varying factors

In view of the cutting chatter problem of thin-walled cylindrical workpieces，a combination of theoretical modeling，numerical simulation and experimental testing was adopted to study the influence of time-varying workpiece thickness and cutting position on the vibration characteristics of thin-walled cylindrical workpieces during the cutting process.The finite element method was used to establish the spindle-chuck-workpiece process system model.The influences of different wall thicknesses and cutting positions on the vibration mode and frequency response function of the thin-walled cylinder cutting system were analyzed.Through the modal experiment and the cutting vibration test，it showed that the shell mode of the thin-walled cylinder was more sensitive to the change of wall thickness，and the vibration response and main vibration mode of the process system at different cutting positions along the workpiece axis were different.It also verified that chatter textures of fish scales and grooves left on the surface were related to the low-order axial beam mode and circumferential shell mode of the thin-walled cylinder.The research results have a guiding effect on the prediction and suppression of chatter in machining of thin-walled workpieces.