| 摘要 |
PURPOSE:To enhance the machining efficiency by employing copper alloy, steel or ferric alloy as core material, by using a composite wire whose external layer is coated with Zn, Cd, etc., and thereby providing straightness as well as eliminating residual warp after being unwound. CONSTITUTION:A Zn pipe of 10 and 8mm.phi in outer and inner diameters, respectively, is fitted on a wire 2 of 7mm.phi, for example, made of brass (Cu-30%Zn), and a stretching process is applied. If it shall be processed into an outside diameter of 0.2mm.phi (here, thickness of the sheath 3 before supply of current is 20mum on one side), a one in straight state is heated by supply of current in the final stage of machining so as to form a 2mum thick (2% of radius) intermetal compound layer 5 consisting of Cu and Zn between the brass and Zn layer. Thus an electrode wire with excellent straightness and without residual warp after being unwound is obtained. |
