Abstract
ABSTRACT Plasto-hydrodynamic die-less tube sinking is a relatively new process that eliminates the need for a conventional reduction die. The pulling action of the tube through the viscous fluid gives rise to drag force and generates hydrodynamic pressure, the magnitude of which depends on the type of the fluid pressure medium, working temperature, tube speed, and the geometry of the pressure unit. This hydrodynamic pressure combined with the shear stress initiates the reduction of the tube diameter, avoiding metal-to-metal contact. In previous theoretical works on the hydrodynamic tube sinking process, the change in polymer viscosity within the pressure units and the consequent change in shear stress were not incorporated. In this paper a combined analytical and numerical solution is developed for predicting the reduction in diameter, taking account of the changes in the viscosity of the polymer melt within a stepped parallel bore unit in the tube sinking process.
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