Abstract:The turning experiments with the same turning parameters and two different schemes were carried out on the aluminum rod and the nylon rod of the same diameter, and by the embedded vibration signal analyzer and piezoelectric acceleration sensor the vibration signal of the tool surface were obtained, then by the frequency domain analysis, the changing rule of the average value ρof the maximum selfpower spectral density in all turning experiments of the two experimental schemes with cutting parameters were obtained. The studied indicates that keeping the spindle speed and back cutting depth unchanged, with the increase of feed speed, the average value ρ in turning aluminum bar reduces while ρ in turning nylon bar increases, which makes that at the bigger feed speed the average value ρ in turning nylon bar is higher instead than that in turning aluminum rod. At the lower feed rate, the vibration of the cutting tool surface in turning aluminum rod is stronger than that in turning the nylon rod, and the average value is 402 times that of the nylon rod. Keeping the feed rate and back cutting depth unchanged, with the increase of the spindle speed, the average value ρof the turning vibration corresponding to the two kinds of turning materials increased at first and then reduced. When the spindle speed is less than 700 r/min, the average value ρ in turning aluminum rod increased slowly while the average value ρ in turning the nylon material increased rapidly and was more than that in turning aluminum rod. When the spindle speed is lower, the tool vibration in turning the aluminum rod is more severe than that in the turning of the nylon rod. When the spindle speed is more than 700 r/min, both the average values ρ corresponding to the two turning material reduced and at last their values tended to the same.