Example 04: Solid Carbide Drills

Tool Life Comparison

a

 

PVD coated drills

 

 

drill coating comparison

 

Work piece: wheel hub, Material:38MnV35, Rn=800N/mm2
Ext. coolant: emulsion 7%, carbide K40UF
d=12.6mm, ap=13.5mm, vc=78m/min, f=0.25mm/rev
Source: DaimlerChrysler, Germany