首页|丝束同轴冷阴极电子枪电子束注腰位置影响因素分析

丝束同轴冷阴极电子枪电子束注腰位置影响因素分析

Factors Analysis on the Electron Beam Waist Position of Gas Discharger Electron Beam Gun of Coaxial Beam Wire

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丝束同轴电子束熔丝增材制造(C-EBAM)大部分能量作用于丝材可以避免轴侧送丝模式对成形质量所造成的不利影响,为了进一步提高C-EBAM的成形精度和成形效率,优化电子束流品质,开展了丝束同轴冷阴极电子枪电子束注腰位置影响因素分析的工作.针对C-EBAM电子枪束源等离子阳极透镜结构表征困难,在理论分析电子束注腰空间位置参数的基础上,采用数值模拟与试验分析相结合的方法,研究了阴-阳极电极结构、工作电压、放电气体类型以及气体压力等对束流注腰位置特征参数的影响规律.数值模拟结果表明,阴极球面半径与阳极倾角对束流起静电汇聚能力影响着注腰处电流密度,表现为先增大后减小趋势.试验分析表明,工作电压、放电气体类型以及气体压力影响等离子体电离度与粒子运动速度,改变了注腰空间位置特征参数,即随着工作电压、气体流量增加,电子枪下端面至注腰轴向中心距离、注腰长度分别增大.
Most of the energy of the coaxial electron beam wire additive manufacturing(C-EBAM)acts on the wire can avoid the adverse effect of the axial side wire feeding mode on the forming quality.In order to further improve the forming accuracy and efficiency of the C-EBAM,and optimize the electron beam quality,the work of factors analysis on the electron beam waist position of gas discharger electron beam gun of coaxial beam wire is carried out.Difficulties in characterizing the structure of plasma anode lenses for C-EBAM electron beam sources.Based on the theoretical analysis of the electron beam waist position parameters,a method combining numerical simulation and experimental analysis is adopted.The influence of cathode-anode electrode structure,working voltage,discharge gas type and gas pressure on the beam waist position characteristic parameters is investigated.The numerical simulation results show that the current density at the beam waist is affected by the cathode spherical radius and the anode inclination on the electrostatic convergence ability of the beam,which first increases and then decreases.The experimental analysis shows that the working voltage,the type of discharge gas and the gas pressure affect the plasma ionization degree and the particle velocity,and change the characteristic parameters of the waist position,i.e.,with the increase of the working voltage and the gas flow rate,the distance from the bottom end surface of the electron gun to the axial center of the beam waist and the beam waist length increase respectively.

wire-fed electron beam additive manufacturingcoaxial beam wireelectron gun structureCST electromagnetic simulationwaist position

石毅磊、权银洙、许海鹰、王壮、马文龙、彭勇

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中国航空制造技术研究院高能束流发生器实验室 北京 100024

北京航空航天大学机械工程及自动化学院 北京 100191

中国人民解放军93160部队 北京 100076

南京理工大学材料科学与工程学院 南京 210094

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电子束熔丝增材制造 丝束同轴 电子枪结构 CST电磁仿真 注腰位置

国家自然科学基金国家自然科学基金军工双百工艺攻关国防基础科研计划

5177552752075024JCKY2018205B027JCKY2017205A002

2024

10.3901/JME.2024.03.328

机械工程学报
中国机械工程学会

机械工程学报

CSTPCD北大核心
影响因子：1.362
ISSN：0577-6686
年,卷(期)：2024.60(3)
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