METHOD FOR REMOVING RESIDUAL STRESS OF SOLID WIRE OF TWISTED WIRE OF HARD DRAWN COPPER WIRE

摘要

PURPOSE:To remove residual stress effectively over whole periphery of the surface of a hard drawn copper wire conductor by giving rotatory bending distortion by passing solid wire or twisted wire of the hard drawn copper wire through a rotary body having deviated center of axis. CONSTITUTION:The hard drawn copper wire (solid wire, twisted wire or these insulating covered wire) from which residual stress is to be removed is passed continuously in the direction of the arrow through a fixing member and through holes 3, 6, 3', 6' and 3'' of the rotary bodies, and meanwhile, the rotary bodies 5 and 5' are rotated in the same direction. Accordingly, the hard drawn copper wire 1 is pulled at a fixed speed while rotating on its own axis. At this time, the rotatory bending distortion is given to the wire by rotary bodies 5, 5' having deviated center of axis. Accordingly, the plastic distortion is generated in all radial direction of the wire, and the residual stress is removed almost perfectly.