摘要
针对核电设备维修时电火花加工诱发邻近构件潜在损伤问题,揭示各参数对邻近工件表面完整性的影响机理。基于核电设备特殊工况,自主研发了多参数可控的电火花加工实验装置,通过放电电流、极间距、冲液流速等单因素实验及SEM/EDS表征,解析邻近工件表面损伤规律。实验表明:飞溅的加工屑会在邻近工件表面留下附着颗粒和凹坑,但大部分附着颗粒可通过超声清洗去除;放电能量越大,附着颗粒的密度和直径越大,影响随距离增大而减小;增大冲液速度并保证浸液放电可有效稳定加工过程,减小飞溅强度。在实际加工过程中,邻近工件距离2 mm、加工电流20 A、冲液流速18 mL/s以上时对邻近工件无影响。参数优化为保障核级部件的服役可靠性提供理论支撑与技术路径。
In nuclear power equipment repair,EDM can damage nearby components.This study explores how different parameters affect the surface integrity of adjacent workpieces.Through a self-developed EDM testing device and single-factor experiments(discharge current,electrode spacing,flushing liquid velocity)and SEM/EDS analysis,the surface damage patterns of adjacent workpieces were studied.Results show that ejected debris from machining can adhere to and pit adjacent workpiece surfaces,yet most adhered particles can be removed via ultrasonic cleaning.Higher discharge energy increases the density and diameter of adhered particles,with effects diminishing over distance.Increasing flushing liquid speed and ensuring submersion maintains machining stability and reduces splashing.In practical machining,when the adjacent workpiece is 2 mm away,the machining current is 20 A,and the flushing liquid flow rate is above 18 mL/s,there's no impact on the adjacent workpiece.The parameter optimization system offers theoretical and technical support for the reliability of nuclear-grade components.
作者
夏义豪
张亚欧
高强
卢军成
范伟丰
周围
赵万生
XIA Yihao;ZHANG Yaou;GAO Qiang;LU Juncheng;FAN Weifeng;ZHOU Wei;ZHAO Wansheng(State Key Laboratory of Mechanical System and Vibration,School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;CNNC Nuclear Power Operations Management Co.,Ltd.,Shanghai 201210,China;CNNP Operation Maintenance Technology Co.,Ltd.,Shanghai 201114,China)
出处
《电加工与模具》
北大核心
2025年第6期1-5,86,共6页
Electromachining & Mould
基金
国家自然科学基金项目(52175426、52075333)。
关键词
电火花加工
飞溅颗粒
表面形貌
电蚀产物控制
EDM
splashed particles
surface topography
control of electro-erosion products
