Wires drawn through Rotating Dies

Abstract

A CHANCE observation by one of us (H. G.) that if the die through which a wire was being drawn was simultaneously rotated the tension required was appreciably reduced, has led to results of considerable interest. The following series of values refer to an 80:20 cupro-nickel wire reduced from 0.073 in. to 0.0635 in. in diameter, that is, 24 per cent. A sintered tungsten carbide die of 6° taper was used, with ‘Oil-dag’, a suspension of colloidal graphite in oil, as a lubricant.