Paper 1: Theory of Lubrication Applied to Pressure Nozzle Design in Wire Drawing

Abstract

Using the idea that a tube or nozzle placed in front of a die is capable of generating sufficient pressure to cause a thick hydrodynamic film to be formed during wire drawing, the equations of Tattersall were developed to facilitate the design of such nozzles. Design graphs are presented to correlate the geometrical factors of the nozzle with parameters of lubricant properties, speed, die angle, and film thickness. A preliminary experiment shows how the properties of the stearate soap lubricant under high pressure may be found.