超声珩磨作用下磨削液空化泡的共振频率

Resonant Frequency of Cavitation Bubble in Grinding Fluid Under Ultrasonic Honing

为揭示超声珩磨加工过程中磨削液空化泡的共振特性,首先利用VHX-600ESO显微镜对油石表面的磨削液进行了微观测量试验,得到了共振状态下的空化泡.基于空化泡的动力学理论,推导出了超声珩磨作用下磨削液中空化泡的共振频率方程.数值模拟了水和煤油中空化泡初始半径、磨削液静压力、气泡内含气压、磨削液温度对空化泡共振频率的影响.通过讨论磨削液中空化泡的振动位移,验证了超声频率与空化泡共振频率的匹配关系.结果表明,水中的空化泡要比煤油中更容易发生共振,这是导致粗珩选择水溶液而精珩选择煤油的一个重要原因.

To reveal the resonance characteristics of cavitation bubble in the grinding fluid during ultrasonic honing,experimental observations on the grinding fluid of oilstone surface were carried out firstly using microscope VHX-600 ESO.The cavitation bubble in the resonance state was observed.Based on the bubble dynamics,the resonant frequency equation was established for cavitation bubble in the grinding fluid during ultrasonic honing.The effect of ambient bubble radius,ambient pressure,gas content and ambient temperature of water and kerosene on bubble resonant frequency in the grinding fluid was numerically simulated respectively.The coordination relationship of ultrasonic frequency and cavitation bubble resonance frequency was verified by analyzing the displacement of a cavitation bubble.The results show that the resonance cavitation bubble occurs more easily in water than in kerosene at the same conditions,which is an important reason that water can be selected in coarse honing and kerosene can be chosen in fine honing.