单线横涡式电子束聚焦线圈聚点束斑试验研究
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摘要
为了寻找电子束熔粉设备的单线横涡式线圈在不同高度上电子束聚焦电流和束斑直径的标定,结合观察法和铜膜截束法获得了聚焦电流与聚焦距离关系。使用动态偏转扫描的方法在不同的聚焦距离处使用0.2 mm厚的紫铜带截采电子束,最后拟合分析了获得的不同距离下的聚焦电流。结果发现,肉眼观察到的聚焦状态下的束斑并非最佳的聚焦状态;拟合发现随着聚焦距离的变小聚焦电流以幂函数的形式增长。对比不同聚焦距离下的最小束斑大小发现,随着聚焦距离的变小聚焦电流下的束斑直径也变小,但是束斑圆度变差,为本文提出的方法对选区熔粉成形工作距离的选择提供了指导性的依据。
In order to find the calibration of the electron beam focusing current and the beam spot diameter of the single-line transverse vortex coil of the electron beam melting equipment at different heights,the relationship between the focusing current and the focusing distance is obtained by the observation method and the copper film intercepting method. In the course of the research,the dynamic deflection scanning method was used to intercept the electron beam at a different working distance using a 0.2 mm thick copper strip. Finally,the focus currents at different distances were obtained by fitting. It was found that the beam spot in the focused state observed by the naked eye is not the optimal focus state;the fitting finds that the focus current grows as a power function as the working distance becomes smaller. Comparing the minimum beam spot sizes under different working distances,it is found that as the working distance becomes smaller,the beam spot diameter under the focusing current also becomes smaller,but the beam spot roundness becomes worse. And the method proposed in this paper provides a guiding basis for the selection of working distance of melt forming in the additive manufacturing.
In order to find the calibration of the electron beam focusing current and the beam spot diameter of the single-line transverse vortex coil of the electron beam melting equipment at different heights,the relationship between the focusing current and the focusing distance is obtained by the observation method and the copper film intercepting method. In the course of the research,the dynamic deflection scanning method was used to intercept the electron beam at a different working distance using a 0.2 mm thick copper strip. Finally,the focus currents at different distances were obtained by fitting. It was found that the beam spot in the focused state observed by the naked eye is not the optimal focus state;the fitting finds that the focus current grows as a power function as the working distance becomes smaller. Comparing the minimum beam spot sizes under different working distances,it is found that as the working distance becomes smaller,the beam spot diameter under the focusing current also becomes smaller,but the beam spot roundness becomes worse. And the method proposed in this paper provides a guiding basis for the selection of working distance of melt forming in the additive manufacturing.
引文
[1]李亚江,王娟.特种焊接技术及应用[M]. 5版.北京:化学工业出版社,2018.
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[3]张向东,黄国华,莫力林.小束流电子束焊焊缝黑边问题的研究与探讨[J].焊接技术学报,2018,8(47):86-90.
[4]陈云霞,王小京,陈本善.基于电子束快速成型金属粉末扫描路径试验[J].焊接学报,2014,10(35):81-84.
[5] HARRYSSON Ola L A,HORN Timothy J,Overview of cur rent additive manufacturing technologies and selected applica tions[J]. Science Progress,2012,95(3):255-82.
[6] HARRYSSON O,CORMIER D R. Evaluation of titanium implant components directly fabricated though electron beam melting technology[J]. Advanced Materials and Processes,2008,163(7):72-75.
[7]杨波,代建辉,左从进.控制电子束高频偏转扫描的电磁系统仿真及设计[J].航空制造技术,2015(SI):87-90.
[8]叶禹豪,左从进,许海鹰. CST仿真技术在电子枪聚焦部件中的应用[J].航空制造技术,2018,9(61):78-82.
[2]何成旦,李鹤岐,李春旭.电子束焊接电子枪电子光学系统的设计[J].兰州理工大学学报,2004,5(30):5-8.
[3]张向东,黄国华,莫力林.小束流电子束焊焊缝黑边问题的研究与探讨[J].焊接技术学报,2018,8(47):86-90.
[4]陈云霞,王小京,陈本善.基于电子束快速成型金属粉末扫描路径试验[J].焊接学报,2014,10(35):81-84.
[5] HARRYSSON Ola L A,HORN Timothy J,Overview of cur rent additive manufacturing technologies and selected applica tions[J]. Science Progress,2012,95(3):255-82.
[6] HARRYSSON O,CORMIER D R. Evaluation of titanium implant components directly fabricated though electron beam melting technology[J]. Advanced Materials and Processes,2008,163(7):72-75.
[7]杨波,代建辉,左从进.控制电子束高频偏转扫描的电磁系统仿真及设计[J].航空制造技术,2015(SI):87-90.
[8]叶禹豪,左从进,许海鹰. CST仿真技术在电子枪聚焦部件中的应用[J].航空制造技术,2018,9(61):78-82.