1 Department of Management Engineering, Technical University of Denmark2 unknown
Since 2003 an ongoing European project has been running involving Universities, lubricant and steel manufacturers, finite element software developers, and industrial partners from Denmark, Finland, Great Britain, Germany and Spain. One the most important goals of this large project is to develop alternative lubricants in order to substitute the old and harmful chlorinated paraffin oils. The present project is a small part included in that bigger project called Enlub, in which the newly developed lubricants have been tested by tribological simulative methods. The bending under tension test (BUT) and the strip reduction test (SRT) have been the methods used for this task. Three different samples from Pinifer oils, and two prototypes from Chemetal and Jokisch have been the non-contaminating lubricants tested. Therefore they have been compared to a plane mineral oil (CR5 from Houghton) and a chlorinated TDN81 from Castrol. All those lubricants were tested using four different kinds of workpiece materials: a stainless steel, a mild steel and two zinc coated steel with the same chemistry but different surface textures. The results obtained by simulative testing have been encouraging in some cases but also disappointing in others. In fact, it can be said that none of those lubricants has been able to improve the performance of the chlorinated oil on stainless steel. However, the results obtained by the polymer coating on this material have been really encouraging, reaching performances close to the chlorinated ones. When using a different workpiece material, the results change. The newly developed oils reach even better roughness performances than the TDN81 on zinc coated steel at the SRT. On mild steel, the results of one and others are still quite similar. Finally, a preliminary investigation has been carried out on the BUT test in order to analyse the influence of the tool rest temperature on the lubricating performance of a plane mineral. The results are quite explicit, showing an increase on the torque measured at the tool when rising the temperature. The lubricant’s properties are really affected by this temperature increase.