Abstract
In electron beam drilling of metals, drilling characteristics depend on physical constants of metals to be drilled and on drilling conditions of pulsed electron beam to be used, i. e., beam power, beam diameter, pulse duration, number of pulses, etc. In the present paper, the drilling characteristics are experimentally studied on various kinds of metals by varying pulse duration and number of pulses. The effects of these conditions on drilled diameter and on drilled depth were obtained. The drilled diameter varied with the pulse duration slightly, but did not vary with the number of pulses used. The drilled depth varied both with the pulse duration and with the number of pulses. The effect of number of pulses on the drilled depth could be explained based on a proposed model of drilling mechanism. Moreover, it has been discovered that various relations between the pulse duration and the drilled depth for individual metals can be summarized to a single general relation between a normalized pulse duration and a normalized depth.
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