Bottom surface smoothing of high aspect ratio hole by guiding large-area electron beam with magnet
Bottom surface smoothing of high aspect ratio hole by guiding large-area electron beam with magnet
复制标题
利用磁铁引导大面积电子束实现高深宽比孔的底面平滑
DOI：
10.1007/s00170-021-08380-w
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Akira Okada
中科院分区：
文献类型：
--
作者：
Togo Shinonaga;Jiayu Lu;Mitsuhiro Kimura;Motohiro Inoue;Akira Okada
在大面积电子束（EB）照射方法中，直径约60毫米的高能量密度EB可用于瞬间熔化金属表面。通过大面积EB照射，平面形状的模具钢的表面粗糙度在短时间内降低。然而，难以平滑高深宽比孔的底表面，因为EB倾向于集中在孔的入口边缘和/或上部内壁上，并且EB的能量密度可能在孔的底表面上降低。那么，需要一种将EB引导到高深宽比孔的底面的方法。由于EB倾向于沿着磁力线螺旋移动，因此通过用磁体控制工件附近的磁场，EB可以集中在底表面上。 在本研究中，提出通过在工件下方设置磁铁来在高深宽比孔的底面上引导大面积EB，以使底面光滑。利用电磁场分析计算工件附近的磁力线，并研究将EB引导至高深宽比孔底面的可能性。实验和分析结果表明，通过移动磁体的水平偏移距离，多步EB照射可以使高深宽比孔的底面变得光滑。
In a large-area electron beam (EB) irradiation method, high energy density of EB with about 60 mm in diameter can be used for melting metal surface instantly. Surface roughness of mold steels with planar shape decreases in a short time by the large-area EB irradiation. However, it is difficult to smooth a bottom surface of high aspect ratio hole, since the EB tends to concentrate on the entrance edge and/or upper inside wall of hole, and the energy density of the EB may decrease on the bottom surface of hole. Then, the method for guiding the EB to the bottom surface of high aspect ratio hole is required. The EB may concentrate on the bottom surface by control of magnetic field near the workpiece with the magnet, since the EB tends to move spirally along the magnetic force lines. In this study, guiding the large-area EB on the bottom surface of high aspect ratio hole is proposed by setting the magnet under the workpiece in order to smooth the bottom surface. Magnetic force lines near the workpiece are calculated by using the electromagnetic field analysis, and the possibility of guiding the EB to the bottom surface of high aspect ratio hole is investigated. Experimental and analytical results clarified that the bottom surface of high aspect ratio hole can be smoothed by multi-step EB irradiation with moving the horizontal offset distance of magnet.
大面积电子束辐照提高氧化锆耐磨性的研究
DOI：
10.2526/ijem.24.27
发表时间：
2019
期刊：
International Journal of Electrical Machining
影响因子：
--
作者：
Togo Shinonaga;Mitsuhiro Kimura;Motohiro Inoue;Akira Okada
通讯作者：
Akira Okada
大面积电子束辐照金属模具高效精加工工艺
DOI：
--
发表时间：
2005
期刊：
Precision Engineering 29・4
影响因子：
--
作者：
Yoshiyuki UNO;Akira OKADA;Kensuke UEMURA;Purwadi RAHARJO;Toshihiko FURUKAWA;Kosaku KARATO
通讯作者：
Kosaku KARATO