Milling Characteristics and Damage Assessment of Ultrasonic Vibration-Assisted End Milling C_(f)/SiC Composites  

作　　者：Zhongwang Wang Zhigang Dong Yan Bao Yichuan Ran Renke Kang 

机构地区：[1]State Key Laboratory of High‑performance Precision Manufacturing,Dalian University of Technology,Dalian 116024,China

出　　处：《Chinese Journal of Mechanical Engineering》2024年第6期73-89,共17页中国机械工程学报(英文版)

基　　金：Supported by National Key Research and Development Program of China(Grant Nos.2019YFA0708902,2022YFB3404002);Fundamental Research Funds for the Central Universities of China(Grant No.DUT22LAB501);National Science Foundation for Distinguished Young Scholars of China(Grant No.52325506);National Natural Science Foundation of China(Grant No.52275411)。

摘　　要：C_(f)/SiC composites are characterized as anisotropic,heterogeneous,brittle,and hard materials.The process of manufacturing C_(f)/SiC composites using traditional machining techniques is prone to edge chipping damage and tool wear,which makes it difficult to meet the machining quality and machining accuracy.The purpose of this paper is to investigate the milling characteristics and damage assessment during ultrasonic vibration-assisted end milling(UVAEM)of C_(f)/SiC composites.Firstly,UVAEM experiments on C_(f)/SiC composites were carried out at different ultrasonic amplitudes and comparative experiments with conventional milling(CM).In addition,tool wear,surface roughness,surface micromorphology,milling force and subsurface damage(SSD)were measured and analysed.Finally,the SSD factors of C_(f)/SiC composites were established to quantify machining damage,and analyzed the effect of ultrasonic amplitude on SSD.Furthermore,the formation mechanism of SSD was investigated and discussed.The findings indicate that appropriate ultrasonic amplitude improves the surface quality by UVAEM,while excessive amplitude deteriorates the surface quality.During the UVAEM,micro/macro brittle fracture of the fibers on the surface occurs,leading to machining defects such as fiber breakage,fiber-interface debonding and pits.The milling force gradually decreases with the increase of ultrasonic amplitude.On the other hand,the forms of SSD in CM and UVAEM are mainly fiber pullout,subsurface crack,crack extension and machining pits.Matrix cracking and fiber pullout in SSD were affected by fiber orientation.Moreover,the introduction of ultrasonic vibration plays a significant contribution in the inhibition of the SSD in C_(f)/SiC composites.

关 键 词：C_(f)/SiC composites Ultrasonic vibration-assisted end milling Ultrasonic amplitude Milling characteristics Damage assessment 

分 类 号：TB3[一般工业技术—材料科学与工程]