CONTINUOS WIRE DRAWING DEVICE AND WIRE DRAWING METHOD FOR WIRE ROD WITH SLENDER DIAMETER, USING THIS METHOD

摘要

PROBLEM TO BE SOLVED: To enable high speed wire drawing without performing the change of holed die frequently, which is caused by wear providing successively and arranging two sets of four-roll type roller dies unit with the rolling down direction specified on the downstream side of the downstream most holed die. ;SOLUTION: This is the continuous wire drawing device in which holed die 2 having a hole with a circular cross-section and circular take-up 3 are provided successively and arranged alternatively. Two sets of the four-roll type roller dies unit 5,5 with the rolling down direction shifted in a phase of 45°, are provided successively and arranged between the downstreammost take-up shuttle 3 and a take-up machine 4. As the downstreammost holed die, the holed die satisfying a following inequality I is used, and as the four-roll type roller dies unit 5, the roller dies unit consisting of four caliber rolls forming a circular caliber satisfying inequality II and inequality III, is used. Inequality I: Ds-0.02≤Dd≤1.05×Dm, Inequality II: 0.94×Ds≤Dm≤Ds, and Inequality III: 1.01≤Df/Dm=0.15. where Dd: Inside diameter of downstreammost holed die, mm, Ds; Finish target wire diameter, mm, Dm: Dimension between groove bottoms of circular caliber, mm Df: Dimension between edge parts of circular caliber, mm.;COPYRIGHT: (C)1998,JPO