A new approach for cold extrusion process: Dimples indentation on sliding contact surface and palm oil as an alternative lubricant

Surface texturing is one of the economic solution of modification die if compared with tool change and hot works. In extrusion die design, it has become increasingly common to add dimple for maintaining lubricant flow along the metal forming process. For that reason, this research was done by embedded a dimples on a taper die sliding contact surface to explore its effectiveness on a finished product of cold extrusion process. Beside, an alternative lubricant from palm oil was also tested and mineral oil was used for comparison purpose. As a result, dimpled taper die may help to decrease the extrusion load of cold extrusion process, so as resulting finer surface roughness of extruded product. Palm oil based lubricant also presents similar results with mineral oil which means that, palm oil has a potential to be considered as new metal forming lubricant in a future.