功率超声珩磨空化试验分析

发布时间：2018-12-14 08:03

【摘要】：功率超声珩磨加工过程中会发生空化现象,为探究空化对被加工材料表面的影响,进行超声珩磨空化正交试验并针对凹坑最大直径、表面侵蚀率、表面粗糙度三个指标进行试验分析,这三个指标可分别表征单泡溃灭强度,整体空化强度及空化对材料表面质量影响,结果表明:空化造成材料表面微小凹坑,影响凹坑最大直径的主要因素依次为距离和振幅,距离越小,振幅越大,则凹坑最大直径越大;影响表面侵蚀率的主要因素依次为试验时间和距离;而振幅则对材料表面粗糙度的影响最大,在距离5 mm、振幅65%、试验时间1/3 min条件下,试样表面粗糙度降低,表面质量提高。因此,在一定条件下,空化效应有助于改善超声珩磨中工件表面质量,试验分析结果对超声珩磨实际加工具有借鉴意义。
[Abstract]:Cavitation will occur in the process of power ultrasonic honing. In order to investigate the effect of cavitation on the surface of processed materials, the orthogonal experiment of ultrasonic honing cavitation is carried out, and aiming at the maximum diameter of pits and the rate of surface erosion, Three indexes of surface roughness were tested and analyzed. These three indexes can characterize the collapse strength of single bubble and the influence of cavitation strength and cavitation on the surface quality of materials. The results show that cavitation results in tiny pits on the surface of materials. The main factors affecting the maximum diameter of the pit are the distance and the amplitude in turn. The smaller the distance, the greater the amplitude, the greater the maximum diameter of the pit; The main factors affecting the surface erosion rate are the test time and distance. The effect of amplitude on the surface roughness of the material is the greatest. When the distance is 5 mm, the amplitude is 65 and the test time is 1 / 3 min, the surface roughness of the sample decreases and the surface quality is improved. Therefore, under certain conditions, cavitation effect is helpful to improve the surface quality of workpiece in ultrasonic honing, and the experimental results can be used for reference in practical processing of ultrasonic honing.
【作者单位】：中北大学机械与动力工程学院;
【基金】：国家自然科学基金资助项目(51275490)
【分类号】：TG580.67

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