Method for the multiple drawing of steel wire

摘要

The present invention consists in the drawing of steel wire through a series of drawing dies (4l,..., 4m) using technological dry lubrication on the basis of fatty acid salts. Drawing is performed through drawing dies (4l,..., 4m) with a working angle of taper which decreases from one drawing die (4i) to the next drawing die (4i+1) in accordance with the following relation: <IMAGE> in which: alpha i+1 is the entry angle of the working zone of a following drawing die (4i+1); alpha i is the entry angle of the working zone of a preceding drawing die (4i); ni+1 is the number of a following drawing die (4i+1); ni is the number of a preceding drawing die (4i); and i = 1, 2, 3, ..., m. <IMAGE>