超声振动珩磨作用下空化泡动力学及影响参数

为了合理利用超声振动珩磨作用下的空化效应,以磨削区单个空化泡为研究对象,考虑珩磨头合成扰动速度和珩磨压力的作用建立了磨削区空化泡的动力学模型。数值模拟了空化泡初始半径,珩磨压力,液体静压力和超声声压幅值对磨削区空化效应的影响。研究表明考虑超声振动珩磨作用时,空化泡膨胀的幅值会受到抑制,其溃灭时间也会缩短,而且较容易出现稳态空化。珩磨压力和液体静压力对磨削区空化主要起抑制作用,超声波声压幅值在一定范围内能够促进磨削区空化效果的提升。本文的研究为进一步理解超声振动珩磨的空化机理提供了理论支持。

Dynamics of cavitation bubble and parameters under ultrasonic vibration honing

In order to make good use of the cavitation effect under power ultrasonic honing, based on a cavitation bubble, the dynamic model of cavitation bubble was established with consideration of ultrasonic honing velocity and honing pressure. The effect of initial bubble radius, honing pressure, hydrostatic pressure and acoustic amplitude on the cavitation in the grinding area was simulated numerically. The results show that taking the effect of ultrasonic vibration honing into account, the expansion of cavitation bubble was inhibited, the collapse time was reduced and it is easily to generate stable cavitation. The cavitation effect in the grinding area can be decreased by honing pressure and ambient hydrostatic, and increased by acoustic amplitude within a certain range. The study provides a theoretical support for further understanding the cavitation mechanism of ultrasonic vibration honing.