| 摘要 |
PURPOSE:To improve the service life of a wire drawing die and the wire drawing speed by setting the difference in the deflection diameter of a steel wire so that the difference between the maximum diameter and minimum diameter on the cross section of an almost circular wire becomes within the specified value range in case of secondary wire drawing of the steel wire. CONSTITUTION:The difference in the maximum diameter and minimum diameter on the cross section of about circular wire is set in the range of 0.25-0.55mm on the steel wire 1 of which the secondary wire drawing is performed. On the wire 1 passed to a die 3, a lubricant 2 comes in more at the M, O points having smaller wire diameter at the cross section A-B where the face reducing is started. The gap is then reduced at the N, P point having larger wire diameter according to the rotation of the die 3 and on the cross section E-F, the lubricant 2 is uniformly press-fitted between the die 3 and wire 1. In this way the face reduction wire drawing is performed by forming a uniform lubricant film 4 on the wire 1. Consequently the improvement in the service life of a wire drawing die and wire drawing speed is achieved.
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