Load-displacement behavior of RBD palm stearin oil lubricant quantity in cold extrusion

Abstract

Large consumption of lubricant may affect the environment due to their high potential of pollution. Therefore, there is significant demand to provide a solution to this current condition by using alternative lubricant that can demonstrate the same lubrication performance as the existing lubricants. In this paper, solid faction lubricant, Refined Bleached Deodorised (RBD) palm stearin has been used to reduce friction resistance between die and billet surface. The RBD palm stearin is less expensive and has good lubrication properties compared to RBD palm olein that is liquid, which often used for cooking. In order to investigate load-displacement behavior and friction coefficient between die-billet interfaces, finite element (FE) analysis has been applied. The extrusion model was built in accordance to experiment. Four different quantities of lubricant were analyzed; 0.1 mg, 1 mg, 5 mg and 20 mg. The results show that the lubricant quantity of 5.0 mg produced the optimum extrusion load and friction coefficient.