Effect of ultrasonic vibration on cavitation erosion of aluminum oxide in fluid jet machining
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ORIGINAL ARTICLE
Effect of ultrasonic vibration on cavitation erosion of aluminum oxide in fluid jet machining Zhe Lv 1
&
Rongguo Hou 1 & Zhongwei Zhang 1 & Zenghua Fan 1
Received: 23 August 2020 / Accepted: 19 October 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract Cavitation-induced erosion plays an important role in the material removal process of ultrasonic-assisted fluid jet machining. The influence of the ultrasonic and hydrodynamic parameters on the cavitation features was investigated in the present study. A numerical method was used to model the cavitation involved in the fluid jet flow field under the ultrasonic vibration condition. Experiments were also carried out to evaluate the cavitation erosion in ultrasonic-assisted fluid jet machining. The results indicated that the cavitation intensity has strong relations with the ultrasonic power output and frequency. Keywords Fluid jet machining . Ultrasonic vibration . Cavitation . Erosion
1 Introduction Fluid jet has been commonly used in precision machining and surface processing of semiconductor components made of brittle materials. The advantages of this processing technology include its flexibility, low thermal effects, and economical efficiency. The material is mainly removed through the abrasion by hard particles laden in the fluid jet. The abrasion efficiency depends strongly on the pressure exerted on fluid. In order to fulfill the needed removal efficiency, pressure has to be adjusted to a relatively high level. However, the high fluid pressure may lead to surface flaws due to the excess kinetic energy of particles. Therefore, it is necessary to use alternative methods to improve the processing efficiency of fluid jet without compromising the integrity of the material. Ultrasonic vibration has been introduced into the fluid jet machining for the purpose of increasing abrasion efficiency. Some researchers implied the ultrasonic vibration on the fluid jet nozzle, the results showed that the pulsed jet can effectively enhance the removal rate. Hloch et al. found that the utilization of ultrasonic pulsating jet can accomplish the fracture-free removal of bone cement [1], disintegration without compromising integrity [2] and strengthening of material * Zhe Lv [email protected] 1
School of Mechanical Engineering, Shandong University of Technology, Zibo 255000, China
subsurface [3]. Hou et al. investigated the pulsating behavior using the CFD method and found that the velocity oscillation of jet can enhance the removal [4]. The present authors proposed to imply ultrasonic vibration on the workpiece; the results indicated that the abrasion was increased by the synergetic effects of the impact of fluid jet and vibration of workpiece [5–7]. The main effects are the additional kinetic energy and cavitation erosion owing to the ultrasonic vibration. The molecules of the liquid medium will be accelerated and oscillate at the vicinity of the equilibrium position under the propagation of the ultrasonic wave. The space between the mo
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