WIRE SIZING-ROLLING METHOD

摘要

A method of sizing-rolling performed by installing three units or more of 4-roll rolling mills in series with each other, comprising the steps of setting, in a first pass, a center angle theta 1 of the complete round forming part of a rolling roll at less than 15 DEG , setting, in the third pass, the center angle theta 3 at 45 DEG or more and, in the second pass (B), the center angle theta 2 at 30 DEG or more, forming the groove of each rolling roll so that a relief part is made tangential to an arc formed with the complete round forming part, installing, in the second pass, a roller guide with four guide rollers on the inlet side so as to hold and guide the free surface of a rolled material by the guide roller, and making equal, in the first pass, the angle alpha of the V-groove in the guide roller to the angle (90 DEG + theta 1) formed by the straight lines forming the relief part of the rolling rolls adjacent to each other, whereby an excellent surface properties can be obtained while a wide size free area is assured even when a wire of 7.0 mm or less in diameter is used.