An investigation was reported on how to improve the machinability of PCBN tool for
realizing the electric spark line cutting of PCBN tool. The machinability of the PCBN tool was
evaluated in terms of its current conductivity. The influences of the additive compositions, additive
concentrations and grit sizes of CBN on the current conductivity of PCBN tool were discussed
through manufacturing PCBN tool. Experimental results indicated that the machinability of PCBN
tool was attributed to the mesh structure of current-conducting additive, which was the combined
effects of high additive concentrations and fine CBN grits.
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