| dc.description.abstract | This study use local fast drilling discharge machine with brass tube electrode of 3 mm outer diameter and 1 mm inner diameter and working liquid by adding graphite particles of particle diameter 25 micro-meter. By doing fast drilling discharge to alloy tool steel SKD11, we study six different parameters as pulse current, pulse duration, capacity, liquid pressure, concentration and feed speed having the effect on material removal rate, electrode wear rate, surface roughness, inlet diameter, variation between entrance and exit of fast drilling discharge.
By experimental results we realize the increase of pulse current, pulse duration, capacity, liquid pressure and feed speed, also the increase of input energy or working speed, electrode wear rate and material removal rate will increase, too. The increase of concentration of working liquid will increase the coated carbine of tool and material electrode, so electrode wear rate and material removal rate will decrease. The increase of pulse current and pulse duration will increase input discharge energy, hole diameter, hole depth and surface roughness. The increase of feed speed will decrease surface roughness. The parameters as liquid pressure, capacity and concentration will not have obvious effect on surface roughness. The increase of pulse duration, capacity, pulse current and feed will increase input energy and working speed, so it will decrease drilling time and secondary discharge times and variation between entrance and exit. The increase of graphite concentration will decrease variation between entrance and exit. | en_US |