| 摘要 |
PROBLEM TO BE SOLVED: To finely work a wire with high dimensional precision and a high working rate by working the wire in the longitudinal direction through rotating plural rotary drive rolls arranged around the wire and working the side face through rotating around the wire to prevent the generation of the disconnection of the wire and a flaw on the surface. SOLUTION: A pair of rotary drive rolls 1, 3 are arranged around a wire 12. The rotary drive rolls 1, 3 have the same diameter, while rotating oppositely to arrow directions 5, 7, clamp and work the wire 12 in the longitudinal direction. Grooves having the curved face of the radius equal to the diameter in which the wire 12 should be worked, are provided on the clamped roll faces. Further, while the rotary drive rolls 1, 3 are rotated in the arrow directions 5, 7, the rolls 1, 3 are rotated and driven around the wire 12 in the arrow directions 9, 10 and relatively to the wire 12, the side face of the wire 12 is worked over the whole periphery. By this method, the wire 12 is efficiently rolled to a desired fine wire, is pulled out in the arrow direction 11 and its cross section is finished to complete roundness.
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