A Study on Pulse Generator for Micro WEDM of Polycrystalline Diamond

Mu Tian Yan; Yi Ting Liu; Guan Ren Fang

doi:10.4028/www.scientific.net/KEM.516.498

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 516A Study on Pulse Generator for Micro WEDM of...

A Study on Pulse Generator for Micro WEDM of Polycrystalline Diamond

Abstract:

This paper presents a new pulse generator for cutting of polycrystalline diamond (PCD) by micro wire-EDM. Three pulse control methods (AC power supply pulse control method, fixed pulse width modulation pulse control method and improved AC power supply pulse control method) have been proposed to achieve high frequency and low energy discharge pulses. The improved AC power supply pulse control method enables the pulse generator to provide a period of 20 μs off duty cycle followed by a period of duty cycle for reionization of the dielectric in the spark. Compared to the other two methods, the improved AC method can provide smaller peak current and discharge duration and thereby achieve a smaller slit width and better surface finish. Tests revealed that the developed power supply using anti-electrolysis circuitry and a digital signal processor-based pulse control circuit can provide very low discharge energy pulses with a frequency of 200 KHz, discharge duration of 0.75 μs and a peak current of 3 A. Experimental results demonstrate that the proposed pulse generator can achieve a feed rate of 0.4 mm/min, a surface finish of 0.53 μm R_a and a damaged layer of 5 μm on PCD surface through proper machining settings.

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Periodical:

Key Engineering Materials (Volume 516)

Pages:

498-503

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.516.498

Citation:

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Online since:

June 2012

Authors:

Mu Tian Yan, Yi Ting Liu, Guan Ren Fang

Keywords:

Discharge Duration, Micro Wire-EDM, Polycrystalline Diamond, Pulse Generator

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