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

Abstract

Surface texturing is one of the economic solution of modification die if compared withtool change and hot works. In extrusion die design, it has become increasingly commonto add dimple for maintaining lubricant flow along the metal forming process. For thatreason, this research was done by embedded a dimples on a taper die sliding contactsurface 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 usedfor comparison purpose. As a result, dimpled taper die may help to decrease theextrusion load of cold extrusion process, so as resulting finer surface roughness ofextruded product. Palm oil based lubricant also presents similar results with mineral oilwhich means that, palm oil has a potential to be considered as new metal forminglubricant in a future.