Zhang Jinwei, Zhu Xijing, Li Jing
School of Mechanical Engineering, North University of China, Taiyuan 030051, China.
Shanxi Provincial Key Laboratory of Advanced Manufacturing Technology, North University of China, Taiyuan 030051, China.
Micromachines (Basel). 2023 Dec 23;15(1):38. doi: 10.3390/mi15010038.
To investigate the machining effect of ultrasonic honing microjets on a titanium-tantalum alloy surface, a cavitation microjet flow impingement model was established using the smoothed particle hydrodynamics-finite element method (SPH-FEM) coupling method including the effects of wall elastic-plastic deformation, the ultrasonic field and the honing pressure field. Simulation analysis was conducted on a single impact with different initial speeds and a continuous impact at a constant initial speed. The results showed that the initial speed of the microjet needed to reach at least 580 to 610 m/s in order to obtain an obvious effect of the single impact. The single impact had almost no effect at low speeds. However, when the microjet continuously impacted the same position, obvious pits were produced via a cumulative effect. These pits were similar to that obtained by the single impact, and they had the maximum depth at the edge rather than the center. With the increase in the microjet's initial speed, the total number of shocks required to reach the same depth gradually decreases. When the number of impacts is large, with the increase in the number of impacts, the growth rate of the maximum pit depth gradually slows down, and even shows no growth or negative growth at some times. Using the continuous impacts of the microjet by prolonging the processing time can enhance titanium-tantalum alloy machining with ultrasonic honing for material removal.
为研究超声珩磨微射流对钛钽合金表面的加工效果，采用光滑粒子流体动力学-有限元法（SPH-FEM）耦合方法建立了考虑壁面弹塑性变形、超声场和珩磨压力场影响的空化微射流流动冲击模型。对不同初始速度的单次冲击和恒定初始速度下的连续冲击进行了模拟分析。结果表明，微射流单次冲击要获得明显效果，其初始速度至少需达到580至610米/秒。低速时单次冲击几乎无效果。然而，当微射流连续冲击同一位置时，通过累积效应会产生明显凹坑。这些凹坑与单次冲击获得的凹坑相似，且其最大深度位于边缘而非中心。随着微射流初始速度的增加，达到相同深度所需的冲击总数逐渐减少。当冲击次数较多时，随着冲击次数的增加，最大凹坑深度的增长率逐渐减缓，甚至有时会出现不增长或负增长。通过延长加工时间利用微射流的连续冲击可增强超声珩磨对钛钽合金的加工以实现材料去除。
