A set of ultrasonic burnishing equipment with two different burnishing tips was designed and manufactured, with which a series of experiments were performed to explore the effects of process parameters and burnishing tips on the surface integrity of austenitic stainless steel material being treated by ultrasonic burnishing (UB). Based on the experiment data, the two surface treatments, i.e. UB with ball tip and UB with roller tip, were comparatively assessed together with the other two surface machining methods of fine turning and grinding. As a further study, a microscopic FE model was built to investigate the three-dimensional transient stress and strain field inside the being treated material. It was found that parameter combination is determinative to surface finishing in UB process, and static pressure and burnishing pass are supposed to be the two most significant parameters for surface integrity of the treated sample. On the whole, roller tip is more preferable to achieve good surface enhancement than ball tip. The superposition of ultrasonic vibration leads to the dynamic change of the stress and strain field in UB, resulting in the oscillating propagation of stress wave inside the material, which gives explanation for the good performance of UB than that of conventional burnishing without ultrasonic.

中文翻译：

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带有两个抛光头的超声抛光处理可提高奥氏体不锈钢的表面完整性

设计并制造了一套具有两个不同抛光尖端的超声抛光设备，并进行了一系列实验，以探索工艺参数和抛光尖端对通过超声抛光处理的奥氏体不锈钢材料的表面完整性的影响（UB ）。根据实验数据，比较了两种表面处理方法，即带球头的UB和带辊头的UB，以及其他两种精加工和磨削表面加工方法。作为进一步的研究，建立了微观有限元模型来研究被处理材料内部的三维瞬态应力和应变场。发现参数组合决定了UB工艺的表面光洁度，静压和抛光通过被认为是处理样品表面完整性的两个最重要的参数。总体上，与球形头相比，辊头更可实现良好的表面增强效果。超声振动的叠加导致UB中应力和应变场的动态变化，导致应力波在材料内部的振荡传播，这为UB的良好性能提供了解释，这比不使用超声的常规抛光效果更好。