| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a metallic round cross-sectional wire rod, capable of manufacturing a wire rod superior in dimensional accuracy, without a surface flaw, by eliminating a falling-in/rolling-in flaw caused on a surface of the wire rod.SOLUTION: A plate coil 1 being a metal strip material processed by rolling, continuous slitting processing in the longitudinal direction is executed by a slitting device 2. A combinational processing process composed of extrusion wire drawing processing to the wire rod having a polygonal cross section of 8 corners in a corner number, provided by a slitting process, peeling processing for removing a layer of a corner part pulled in by being crushed by the extraction wire drawing processing and polishing processing for polishing a wire rod cross-sectional outer peripheral surface, is continuously repeatedly executed in the longitudinal direction of the wire rod, and then, the metallic round cross-sectional wire rod is manufactured by processing by extraction wire drawing until a diameter of the wire rod becomes a predetermined diametrical dimension. |
