超硬合金の微細電極の試作とそれによるTi-6Al-4V合金の微細穴あけ放電加工特性 Fabrication of micro electrode of carbide and micro hole machining characteristics of Ti-6Al-4V alloy by electrical discharge machining
This paper deals with the fabrication of micro electrode of carbide and micro hole machining characteristics of Ti–6Al–4V alloy. The experimental results show that the material removal rate of carbide machined with small discharge energy in positive polarity is larger than that in negative polarity. And when machining carbide with small discharge energy, the energy supply mode, such as large current and short pulse duration, is efficient for promoting the material removal rate. When machining micro hole of Ti–6Al–4V alloy in positive polarity, compared with negative polarity, both the material removal rate and electrode wear rate are larger. It is also shown that the energy supply mode, such as small current and short pulse duration, can increase the material removal rate because of the formation of smaller debris result in easy ejection of debris out of the small gap. Experimental result indicate that when machining micro hole of Ti–6Al–4V alloy, the most significant effect on micro hole accuracy is the machining depth. The reason is that micro deep hole machining will make debris accumulating on the bottom of micro hole to lead to the occurrence of discharge concentration, and then result in the formation of ellipse hole.
軽金属 49(1), 2-7, 1999-01-30
The Japan Institute of Light Metals