75Cr1材质夹层圆锯片夹层阻尼结构优化研究OA

High vibrational responses commonly occur in 75Cr1 sandwich circular saw blades during high-speed cutting due to their large diameter-thickness ratio.To enhance the dynamic stiffness and suppress cutting-induced vibration,a response surface-based predictive model was established to quantify the effects of sandwich damping-layer parameters(layer thickness,layer num-ber,and layer diameter)on the dynamic stiffness,and the optimal parameter combination was subsequently obtained.The accura-cy of the finite-element model for dynamic characteristics was validated through modal test,and the vibration-suppression capabil-ity of the damping structure was evaluated by using harmonic response analysis.The results indicate that the sandwich damping structure reduces the peak vibration amplitude by 45％.Sensitivity analysis results show that the influence of design parameters on dynamic stiffness is in the order of damping-layer diameter＞damping-layer thickness＞damping-layer number.The optimized damping-layer parameters(diameter 392 mm,thickness 1.2 mm,3 layers)yield a dynamic stiffness of 17 211 N/mm,with predic-tion and simulation values differing by less than 5％.A 75Cr1 sandwich circular saw blade was fabricated by using the optimized parameters,which demonstrated a 7.8 dB noise reduction of approximately in cutting tests,representing a 41.8％improvement o-ver the existing sandwich-blade design.