Abstract
The influence of the pulse energy in electrical discharge machining (EDM) of deep holes in 40Х steel workpieces is studied. The factors considered are the change in steel microstructure within the machining zone and the change in dimensions, shape, and surface roughness of the hole under the action of the current pulses. The depth of the defective layer in finishing and precision machining is no more than 1 mm. However, increase in pulse energy in the electrical discharge machining of 40Х steel is associated with increase in microhardness in the white layer and strengthening and increase in width in the tempering zone. Minimum pulse energy is associated with maximum precision and minimum surface roughness.
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