MODELLING OF DIE-LESS TUBE SINKING PROCESS USING A COMBINED PRESSURE UNIT, THEORETICAL PREDICTIONS

Abstract

Inconventional tube sinking process, a tube is pulled through a shaped die, Friction occurs between the tube and the die which leads to the reduction in die life due to wear. There is a new technique using die-less tube sinking in which the smallest die bore  size is greater than the incoming tube outer diameter. The tube passes through pressure fluid (polymer melt) inside the pressure unit of different geometry, hydrodynamic pressure is generated due to the pull of the tube through the pressure unit. The deformation of the tube is caused by the combination of pressure occurs and the drawing stress applied to the tube by the pulling force. In this research, a theoretical study of the pressure distribution within a combined unit through, and study of the deformation process of the tube also has been studied . The unit used in this study consists of two parts a parallel bore and tapered bore sections, results will be useful in understating tube sinking using such new technique.