基于声发射分析的磨料流光整加工在线检测试验研究  

On-line testing of abrasive flow finishing based on AE analysis

作　　者：杜璟琳 董志国 姚新改 张鹏 DU Jing-lin;DONG Zhi-guo;YAO Xin-gai;ZHANG Peng(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Provincial Key Laboratory of Precision Machining,Taiyuan 030024,China)

机构地区：[1]太原理工大学机械与运载工程学院,山西太原030024 [2]精密加工山西省重点实验室,山西太原030024

出　　处：《机电工程》2020年第4期410-414,共5页Journal of Mechanical & Electrical Engineering

基　　金：山西省自然科学基金资助项目(201701D121074)。

摘　　要：针对磨料流光整加工中孔类零件表面粗糙度在线检测困难的问题,将声发射检测技术应用到了磨料流加工中。通过研究磨料流加工过程中的声发射源与声发射特性,利用参数分析法得到了波形特征参数随加工时间的变化曲线,建立了声发射信号的能量及振铃计数与零件表面粗糙度之间的关系;根据幂率流体本构方程计算了壁滑速度,分析了壁滑速度对声发射信号能量的影响。研究结果表明:声发射信号能量和振铃计数随着表面粗糙度的增大而增大,且两者随表面粗糙度的变化规律基本相同;表面粗糙度是声发射信号发生变化的主要原因,随着表面粗糙度的减小,即使增大壁滑速度,声发射信号强度也会降低;声发射可用于磨料流加工孔类零件表面粗糙度的在线检测。Aiming at the difficulty of on-line measurement of surface roughness of hole parts in abrasive flow finishing,acoustic emission detection technology was applied to abrasive flow machining.The source and characteristics of AE signal in abrasive flow processing were studied.The curve of waveform characteristic parameters varying with processing time was obtained by parameter analysis method,and the relationship between the energy and the number of rings of AE signal and the surface roughness of parts was established.According to the constitutive equation of power-rate fluid,the wall slip velocity was calculated,and the influence of wall slip velocity on AE signal was analyzed.The results indicate that the energy and ringing count of AE signal reduces with the increase of surface roughness,and the change rule of them is basically same with that of surface roughness.The surface roughness is the main reason for the change of AE signal.As the surface roughnessdecreases,the intensity of AE signal reduces even if the wall slip velocity is increased.Acoustic emission can be used for on-line surface roughness measurement of abrasive flow machining holes.

关 键 词：磨料流加工 声发射检测 表面粗糙度 壁滑速度 孔类零件 声发射信号强度 

分 类 号：TH161.1[机械工程—机械制造及自动化] TH741.3