Drills for composite machining avoid delamination and fraying

Producing holes in various carbon fibre reinforced plastics (CFRP) demands unique geometries to achieve hole tolerance and quality, as delamination and splintering are common problems. Combining CFRP with a stacked material such as aluminium adds another dimension, as the two materials vary in machining techniques. Released as part of its CoroPak 10.1 new product introductions, CoroDrill 854 and CoroDrill 856 have been developed to withstand the harsh demands of the latest CFRP materials and aluminium stacks, offering long and consistent tool life to meet tight tolerances time after time. Typical aerospace applications for CoroDrill 854 and CoroDrill 856 include wing box and structural airframe components. CoroDrill 854 is preferred where splintering or fraying is the problem; CoroDrill 856 if delamination is the difficulty, in resin-rich materials. Both CoroDrill products help with the elimination of burrs and the enhancement of surface finish. Offering customers a choice of diameters from 4 mm up to 12.7 mm, the standard N20C solid carbide versions with diamond coating are available from stock. Options are also available upon request through Sandvik Coromant's Tailor Made service, providing freedom to specify dimensions, without having to pay for a special tool.