DIE LIFE AND WORKPIECE PROPERTIES UNDER DRY CONDITION IN HIGH-SPEED PRESSWORKING

To explore the feasibility of ''oil-fee'' pressworking, we investigate d the effects on the life of SKD11 steel dies and the quality of phosp hor bronze workpieces under lubricated and unlubricated or dry conditi ons. In addition, the performance of SKD11 dies coated with TiN was we ll as cemented tungsten carbide dies were also examined under dry cond itions. Results show that the life of unlubricated SKD11 dies is about half of that under lubricated conditions. The cemented tungsten carbi de die gives superior die life and workpiece qualify even under dry us e conditions.