Sandvik Coromant has unveiled the new CoroDrill 880 CVD diamond-coated insert grades GCN124 and GCN134.
The new inserts meet the challenges of chip formation and evacuation when drilling non-ferrous metals. The super-hard properties of the diamond coating provide long tool life and combine with innovative chip breaker and geometry designs to guarantee superior performance when drilling materials such as aluminum.
GCN124 and GCN134 diamond-coated insert grades are designed to offer the lowest cost per hole in most ISO N materials thanks to long insert tool life and/or greater productivity. Productivity can be increased as a result of elevated cutting data and from reduced machine downtime thanks to fewer insert changes. Further advantages include easier handling in production thanks to the reliability and longer life of the inserts as well as enhanced surface finish inside the hole, which results from the ability to resist BUE and smearing effects. Reduced insert consumption will also help lower stock levels and environmental impact.
Among those set to benefit are automotive manufacturers drilling and boring aluminum components, such as cylinder blocks, cylinder heads, knuckles, housings, brake calipers, control arms, transmission cases, steering-column covers, and yokes. Moreover, the diamond-coated inserts will also offer competitive gains to any company producing ISO N parts as well as those performing niche composite applications, such as drilling GFRP rotors/blades for the wind turbine industry.
Sandvik says that when drilling a 22 mm diameter blind hole to a depth of 84.1 mm in a cylinder head made from 6061-T6 aluminum (90-100 HB), a CoroDrill 880 mounted with the new N124 (peripheral) and N134 (central) inserts extended tool life from 700 to 3,024 pieces; a 332% increase. The new insert permitted increased cutting speed, allowing productivity to increase by 33%. In total, some 300 hours of production time were saved, while overall cost per hole was reduced by 23%.
Readers can watch a side-by-side comparison here: