ZHENG J X, DENG H L, GUO Y L, et al.Effect of cavitation ultrasonic rolling on surface quality of 7075 aluminum alloy[J].Journal of Henan Polytechnic University(Natural Science) ,2024,43(4):111-116.

doi:10.16186/j.cnki.1673-9787.2022060024

Received:2022/06/14

Revised:2023/02/18

Published:2024/07/05

Effect of cavitation ultrasonic rolling on surface quality of 7075 aluminum alloy

ZHENG Jianxin, DENG Hanlin, GUO Yonglei, SHANG Yingju, JIA Liuyin, CUI Xiaobin

School of Mechanical and Power Engineering，Henan Polytechnic University，Jiaozuo 454000，Henan，China

Abstract: Objectives To explore the influence of cavitation effect on the surface quality of parts in ultrasonic rolling processing，  Methods the comparison tests including cavitation ultrasonic rolling and ordinary ultrasonic rolling were carried out on 7075-T6 aluminum alloy after turning. The surface roughness of the processed workpiece was measured by a surface roughness meter，the surface microhardness was measured by a microhardness tester，and the surface micro-morphology was measured by a large depth-of-field ultra-compact microscope.  Results The results showed that，both ordinary ultrasonic rolling and cavitation ultrasonic rolling could reduce the surface roughness and increase the surface micro-hardness of the workpiece after rolling processing.With the increase of the static load in the two ultrasonic rolling processing methods，the surface roughness of workpieces decreased gradually and the surface microhardness increased gradually.Ultrasonic rolling processing made the workpiece surface smoother through the beneficial effect of peak cutting and valley filling.Compared with ordinary ultrasonic rolling，the shock wave and micro-jet caused by cavitation effect could further promote the plastic flow of the material surface layer，which could produce lower surface roughness and higher micro-hardness after cavitation ultrasonic rolling processing，with a much more flatter surface of the workpiece.Under the test conditions of this study，the surface roughness after cavitation ultrasonic rolling processing could be as low as 0.038 μm，and the surface micro-hardness could be as high as 210.07 HV0.1.Under the same static load，the surface roughness after cavitation ultrasonic rolling processing could be reduced by up to 42.2% and the surface hardness could be increased by up to 2.6% when compared with the ordinary ultrasonic rolling processing.  Conclusions It was proved that the introduction of cavitation effect in the ultrasonic rolling processing could further improve the surface strengthening quality.

Key words:ultrasonic rolling;cavitation effect;surface quality;microhardness