李新凯,王荣,王启超,董玉健.扫描电子束微熔抛光临界功率密度规律及实验研究[J].表面技术,2021,50(7):386-393.
LI Xin-kai,WANG Rong,WANG Qi-chao,DONG Yu-jian.Research on Critical Power Density and Experiment of Scanning Electron Beam Micro-melting Polishing[J].Surface Technology,2021,50(7):386-393 |
| 扫描电子束微熔抛光临界功率密度规律及实验研究 |
| Research on Critical Power Density and Experiment of Scanning Electron Beam Micro-melting Polishing |
| 投稿时间：2020-07-24 修订日期：2020-11-12 |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.07.041 |
| 中文关键词: 扫描电子束 抛光 45钢 粗糙度 工艺参数 熔坑 |
| 英文关键词:scanning electron beams, polishing, 45 steel, roughness, technological parameter, pit |
| 基金项目:广西高校中青年教师基础能力提升项目(2020KY05026);广西自然科学基金项目(2017GXNSFDA198007，2020JJB160001);桂林电子科技大学研究生教育创新计划资助项目(2021YCXB02，2021YCXS019) |
| 作者 | 单位 |
| 李新凯 | 桂林电子科技大学，广西 桂林 541004 |
| 王荣 | 桂林电子科技大学，广西 桂林 541004 |
| 王启超 | 桂林电子科技大学，广西 桂林 541004 |
| 董玉健 | 桂林电子科技大学，广西 桂林 541004 |
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| Author | Institution |
| LI Xin-kai | Guilin University of Electronic Technology, Guilin 541004, China |
| WANG Rong | Guilin University of Electronic Technology, Guilin 541004, China |
| WANG Qi-chao | Guilin University of Electronic Technology, Guilin 541004, China |
| DONG Yu-jian | Guilin University of Electronic Technology, Guilin 541004, China |
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| 中文摘要: |
| 目的 明确扫描电子束改善45钢表面粗糙度工艺方法以及电子束抛光工艺参数的内在联系。方法 以热轧空冷45钢为研究对象，通过设定可编程数字信号发生器的参数，实现扫描电子束环状下束的方式，对45钢试样进行微熔抛光处理，搭建45钢表面微熔状态下电子束功率与熔化所需功率密度的临界平衡关系，并采用数值模拟的方法，研究不同工艺参数下试样温度场的变化规律。结果 45钢微熔状态下，电子束束流与工件移动速度呈非线性关系。当电子束束流为9.36 mA，工件移动速度为11 mm/s时，45钢表面原始铣削划痕完全消失，且光洁度良好，表面粗糙度由2.0 μm降至0.43 μm，降低幅度约为78.5%。部分参数下，表面会出现熔坑、褶皱现象。这是因为单个扫描周期过长，能量积累，导致表层过度熔融。4#试样经电子束处理后，铣削划痕仍旧可见，这是因为单个扫描周期仅为3.6 s，表层能量流失过快，导致熔融不全的现象。结论 扫描电子束处理45钢表面，可显著降低试样表面粗糙度。通过调节工艺参数，可控制电子能量密度和散热速率，减少熔坑、褶皱的出现。 |
| 英文摘要: |
| The purpose of the paper is to clarify the technological method of improving the surface roughness of 45 steel by scanning electron beam and the internal relation of technological parameters of electron beam polishing. Hot rolled air- cooled 45 steel is taken as the research object. By setting the parameters of programmable digital signal generator, the micro-melting polishing treatment is carried out on 45 steel samples, and the critical equilibrium relationship between the electron beam power and the power density required for melting is established. Numerical simulation is used to study the variation law of temperature field of samples under different process parameters. There is a nonlinear relationship between electron beam and workpiece moving speed in micro-melting state of 45 steel. When the electron beam current is 9.36 mA and the workpiece moving speed is 11 mm/s, the original milling scratches on the surface of 45 steel disappear completely, and the surface roughness decreases from 2.0 μm to 0.43 μm, with a decrease range of about 78.5%. Under some parameters, molten pits and wrinkles will appear on the surface, which is because the single scanning period is too long and energy accumulation leads to excessive melting of the surface. Milling scratches of 4# sample are still visible after electron beam treatment, because the single scanning period is only 3.6 s, and the surface energy loss is too fast, resulting in insufficient melting. Conclusion Scanning electron beam treatment on the surface of 45 steel can significantly reduce the surface roughness of the sample. By adjusting the process parameters to control the electron energy density and heat dissipation rate, the probability of molten pits and wrinkles can be reduced. |
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