数控铣削时工件振动响应的试验研究

Experimental Study on the Vibration Response of the Work-piece during the Numerical Control Milling

通过压电式加速度传感器和嵌入式虚拟振动测试仪,对数控铣床在给定铣削参数的铣削过程中工件的振动响应进行了量化研究,通过测试得到了工件振动响应信号的时域曲线及频谱曲线。试验表明:在一次完整走刀的铣削过程中,工件振动的自功率谱密度最小值一般出现在走刀行程的中间位置;随着转速的降低,最大自功率谱密度值明显减小;连续走刀时工件材料的减少对其受迫振动的能量及频率的影响不明显。

By using the piezoelectric acceleration sensor and embedded virtual vibration tester, the quantitative study was carded out on the vibration response of the work-piece at the given milling parameters on CNC milling machine. The time-domain curves and frequency-spectrum curves of the vibration signal of the work-piece were obtained by test. Experimental results indicate that： in a complete tool moving path of milling, the minimum of the self-power spectral density of the work-piece vibration is generally in the middle of tool moving path ; with the decrease in spindle speed, the maximum of the self-power spectral density reduces significantly; the impact of the reduction of the work-piece material during the continuous tool moving is not obvious to its energy and frequency of the forced vibration.