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.

中文翻译：

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深孔放电加工

研究了脉冲能量对40Х钢工件深孔放电加工(EDM)的影响。考虑的因素是在电流脉冲作用下加工区内钢组织的变化以及孔的尺寸、形状和表面粗糙度的变化。精加工和精密加工的缺陷层深度不超过1mm。然而，40Х钢放电加工脉冲能量的增加与白层显微硬度的增加和回火区的强化和宽度的增加有关。最小脉冲能量与最大精度和最小表面粗糙度相关。