Influence of Electrical Parameters on the Machining Performance in the Small Hole Drilling by EDM Process

Kamonpong Jamkamon; Piyapong Kumkoon; Suppawat Chuvaree

doi:10.4028/p-CtB8KO

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Influence of Electrical Parameters on the Machining Performance in the Small Hole Drilling by EDM Process

Abstract:

This research aims to study the influence of controlled parameters on the machining performance for small hole drilling by an electrical discharge machine. Tubular copper with an outside diameter of 1 mm was used as an electrode. JIS SKD 61 grade steel at a depth of 40 mm for machining was used as a workpiece. The experimental results show that machining speed and electrode wear drastically increased with the discharge current. The high machining performance with varied pulse on-time occurred in the range of 16 to 28 μs. The machining time and electrode wear ratio increased with a decreased pulse off-time. In addition, the lowest difference in the dimension of the entrance and exit of the drilled hole at approximately 0.030 mm appeared at the pulse off-time of 6 μs. However, the high machining speed and electrode wear ratio occurred at the low dielectric pressure of 20 kg/cm². Furthermore, the machining performance reduced and slightly fluctuated with the varied dielectric pressure in the range of 40 to 80 kg/cm².