PURPOSE: To make the wire drawing method of a hard steel wire of, by the finished wire diameter, 0.05-0.2mm which is conventionally on the level of the wire drawing speed 600m/min to high speed and high efficiency.
CONSTITUTION: On a wet slip continuous wire drawing machine, number of dies are 35-50 pieces, the cooling between dies are executed with the system being sunk all in the water soluble lubricant, and the dies for wire drawing which are dies until the 10th number, at least, counted from the final die are fixed in the die holders by using a spring material having a specific vibration ratio, and the hard steel wire of, by finish wire diameter, 0.05-0.2mm is manufactured with the final drawing velocity of 1500-2500m/min and with the high reduction of area of the total true strain 4-6 while preventing the variation and the vibration of the tensile strength to the wire. By this invention, the repeating use of the extra fine wire drawing machine is become needless, the extra fine steel wire of excellent mechanical properties and strand workabilitv can be drawn with high speed, and the manufacturing cost of the extra fine wire can be reduced. And the extra fine wire of excellent quality can be presented because the degradation due to aging is small.
TASHIRO HITOSHI
SATO HIROSHI
