Abstract
It has been said that the high power density electron beam drilling is performed by the heating inside the target which is caused by the phenomenon that the high potential electrons penetrate into target. However, from the view-points of heat conduction theory and dynamic theory it has not been made clear. In this paper, the mechanism of high power density electron beam drilling of metals is discussed on the bases of heat conduction and force balance between vapour pressure and shrinking pressure due to surface tension. Namely, the critical temperature of generation of molten metal removal and the drilling speed are estimated. The estimated speed coincides with the experimental value. Moreover, the phenomenon of saturation of drilled depth is explained rationally.
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