| 摘要 |
PURPOSE:To stabilize the inter-electrode voltage and the machining current while to reduce adhesion of electrode component to the work by heating Cu-Zn alloy wire under such ambient as Cu is scarcely oxidized but Zn is oxidized. CONSTITUTION:Alloy composed of 28-37wt% of Zn, total 0.2-2wt% of more than one or two kind of Si, Ti, Zr, Al and the remainder of Cu is employed as the core material and in order to form desired film onto the surface of Cu-Zn alloy wire, thermal processing is executed under such ambient where Cu is scarcely oxidized but Zn is oxidized. Preferably, said ambient has the temperature higher than 500 deg.C and the oxygen partial pressure of 10<-2>-10<-2> bar. The heating time is about 45min. Thereafter, the outer diameter is adjusted and the softened wire is hardened then stretched to increase the tensile force. |
