Galling-Free Fine Blanking of Titanium Gears Using Carbon-Supersaturated YXR7 Punch

A titanium gear with the industrial grade I was fabricated by fine blanking the titanium plate in cold. The carbon supersaturated (CS-) high-speed steel punch was prepared by the low temperature plasma carburizing system for this single-shot fine-blanking. The free-carbon tribofilm was in situ formed onto the interface of CS-punch to titanium work so that no adhesive wear occurred even during severe shearing process. SEM-EDX was utilized for analysis on the contact interface between fine blanking punch and titanium work. This analysis proved that the free-carbon tribofilm was formed on the sheared interface. The titanium gears were continuously punched out by using CS-punch. Their dimensional accuracy was evaluated by the coordinate measuring system to analyze the gear-grade balancing at the blanked titanium gears.