超声珩磨中声空泡溃灭微射流冲击特性的研究

发布时间：2018-08-12 10:10

【摘要】：超声珩磨加工过程中会产生强烈的声空化现象,近壁空泡溃灭会产生高速微型射流,冲击材料表面造成变形损伤.为探究空泡溃灭微射流的冲击特性及其对壁面材料的作用,选用sph-fem方法,建立微射流冲击壁面模型,进行仿真分析,并设计超声珩磨谐振系统空化试验.结果表明:微射流冲击壁面后形成高速侧向射流,且其最大速度可达到冲击速度的1.593倍,高速侧向射流对材料产生剪切作用;微射流冲击中后期射流中部粒子在激波作用下反向运动向上凸起;微射流冲击后壁面产生直径约8μm,深约0.173μm的微型凹坑,凹坑边缘有材料隆起,射流边缘冲击效应最强;试验中单微射流冲击下产生的凹坑直径在6~12μm之间,与仿真分析结果一致.
[Abstract]:In the process of ultrasonic honing, strong acoustic cavitation will occur, and the collapse of near-wall cavitation will result in high speed micro-jet, which will impact the surface of materials and cause deformation and damage. In order to investigate the impact characteristics of cavitation collapse micro jet and its effect on wall materials, the sph-fem method was used to establish the model of micro jet impinging on the wall, and the simulation analysis was carried out, and the cavitation test of ultrasonic honing resonance system was designed. The results show that the micro-jet impinges on the wall to form a high-speed lateral jet, and its maximum velocity can reach 1.593 times of the impact velocity, and the high-speed lateral jet has shear effect on the material. In the middle and late stage of the micro-jet impingement, the central particles of the jet move upward in reverse motion under the action of shock wave, and the wall surface of the micro-jet impinges about 8 渭 m in diameter and 0.173 渭 m deep. The edge of the crater has a material bulge, and the impingement effect of the jet edge is the strongest. The diameter of the crater produced by single micro jet impingement is between 6 渭 m and 12 渭 m, which is consistent with the simulation results.
【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) 中北大学研究生科技立项资助项目(20151211)
【分类号】：TG580.67;TB559

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