| 摘要 |
A method of and apparatus for electroerosively machining a 3-dimensional cavity in a workpiece with a slender, preferably tubular and continuous, tool electrode whose contour is generally independent in shape of the desired cavity. A horn-type sonic or ultrasonic assembly or a motor-driven mechanical reciprocation unit is used to laterally oscillate the slender electrode to cause the machining tip portion thereof to oscillatorily move at a rate of movement, preferably in excess of 5 m/minute, substantially in a plane normal to the electrode axis. The machining liquid is pumped into the tubular electrode and delivered therethrough into the machining gap at a pressure in excess of 10 kg/cm2. Feed means produces a 3D relative displacement of the electrode axis and the workpiece to cause the laterally oscillating electrode tip to sweep in a scanning manner three-dimensionally over the workpiece while successive electrical discharges are produced between the laterally oscillating electrode tip and the workpiece and the machining gap therebetween flooded with the machining liquid is maintained substantially constant in size.
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