PRODUCTION OF COMPOSITE ELECTRODE WIRE FOR WIRE CUT ELECTRIC DISCHARGE MACHINING

摘要

PURPOSE:To produce inexpensively a titled composite electrode wire with good dimensional accuracy by covering a specifically composed Zn alloy on the outside circumference of a specifically composed copper alloy core material in the large diameter stage larger than the final wire diameter by hot extrusion then subjecting the wire to cold working. CONSTITUTION:A zinc alloy is first hot-extruded on the outside circumference of a core material and is coated thereon in the wire diameter stage larger than the final wire diameter in the stage of coating the zinc alloy contg. >=50wt% zinc on the outside circumference of the copper alloy core marerial contg. 10-40wt% zinc and/or 1-10wt% tin and producing the composite wire. The core material is preliminarily heated to 100-300 deg.C in a nonoxidative atmosphere in this stage and the extrusion temp. of the zinc alloy is maintained at 100-300 deg.C. The wire material is then subjected to cold drawing and is electrically heated in the state of a straight wire, thereby the electrode wire having good workability is obtd. The thickness on one side of the coating layer as a final size is made 2-20% of the overall diameter.