Surface topography simulation of finishing turning based on multi-position vibration fusion
To solve the problem of accurate prediction of surface roughness and surface topography of high-precision machining workpieces,the fusion of vibration signals based on multiple locations was proposed,combined with the shape simulation model synthesized by the tool contour trajectory.The tool profile trajectory equation of the cutting edge changing was established with time.Then the contribution degree of the vibration parts to the surface rough-ness was analyzed by principal component analysis,and the vibration signals from different parts were fused.Final-ly,the above two parts were superimposed to obtain the surface roughness and surface topography simulation mod-el.According to the different sources of vibration signals,the tool Profile Trajectory-Simulated vibration model(PTS)model and tool Profile Trajectory-Measured vibration model(PTM)model were established for research.The vibration signal in the PTS model was the vibration displacement obtained by solving the turning dynamics mod-el,the vibration signal in the PTM model was the vibration displacement signal actually collected in the cutting ex-periment.Through the comparison of simulation and test results,the PTM model was more accurate than the PTS model,both model surface topography simulation models had high accuracy and could provide reference for actual processing and production.
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