超硬合金における放電加工条件と表面微小クラック深さとの関連性

概要

論文の詳細を見る
Cemented carbide P20 was worked by electrical discharge machining (EDM) using a transistor-type machine with a jet-type copper electrode. The occurrence of abnormal discharge which causes extremely deep cracks could be suppressed under a condition of large flow amount of fluid (kerosene) Q, large discharge time τ_<on> and small duty factor D. Furthermore, increasing peak value of current I_p for a given τ_<on> and decreasing τ_<on> for a given D were effective in raising stock-removal rate V without introducing deep cracks onto the machined surface. Analysis of the results on EDM of several kinds of cemented carbides showed that depth of surface crack l was uniquely related to the discharge energy of one pulse by the equation l = 3.92 (I_p × τ_<on>)^<0.37> [l : μm, I_p : A, τ_<on> : μs], within a factor of two.
一般社団法人日本機械学会の論文
1995-03-25