关键词: 电火花加工, 脉冲电源, 小孔加工, 实验研究

Abstract: For the problems of the low energy utilization of conventional pulse generator, the resistors overheating and huge cooling equipments, a kind of EDM pulse generator was presented herein,which cancelled the current limiting resistors. The pulse generator was made up of a PWM controller, a DC/DC converter, a machining pulse sequence generator and so on. It could automatically adjusting the output voltages, and the no load voltages, pulse width and pulse interval were adjustable in a wide range. The bulky frequency transformer was cancelled in the pulse generator. The experimental curves of the electrode wear rate, small holes ovality and one-side discharge gaps were obtained by the multiple small hole machining experiments. The experimental curves were closely related to the stability of the pulse generator. These data show that the pulse generator has good stability and reliability.

Key words: electrical discharge machining(EDM), pulse generator, small hole machining, experimental study