Drilling composite materials

The new CoroDrill Delta-C R854 is engineered to:

• increase production security with its micro- grain substrate and diamond coating

• provide good quality holes in composites due to the new point geometry

• reduce bending of thin-walled components due to lower thrust and torque values

• offer a wide application area for dry and wet machining, with or without coolant holes

Drilling of carbon fibre and carbon fibre with aluminium stack.

New CoroDrill® Delta-C R854CoroDrill Delta-C R854 is an optimum drill for composite materials. It is available as a Tailor Made tool in many different combinations, such as with or without chamfer for counter-sink operations.

Available from diameter 2.38 mm (3/32”) up to 20 mm or inch equivalent and lengths up to 310 mm (12”).

Improved productivity – with N30C diamond coatingNew N30C, a wear resistant diamond coating is designed to reduce downtime by improving security and tool life in very abrasive materials such as carbon fibre and composite. Its thin coating in combination with the fine grain substrate ensures easy cutting action for more accurate holes with less friction through sharper cutting edges.

Carbon fibre and carbon fibre/aluminium stacked materials

DemandsAs composite materials develop for their demanding application areas (including aircraft such as modern jets and helicopters) the demand for optimized cutting tools increases. Hole quality, production security and manufacturing economics are some of the most important factors.

Patented geometryDrilling composites with the new patented CoroDrill Delta-C R854 geometry improves production security, hole quality and tool performance.

The new unique low-thrust geometry lowers axial pressure, which in turn decreases the deflection of thin-walled parts and helps to minimize:

• Delamination on CFRP (Carbon Fibre Reinforced Plastic)

• Splintering, where carbon fibres break off on entry or exit

• Fraying, where the fibres fray between layers

CoroDrill® Delta-C R846CoroDrill Delta-C R846 gives a secure drilling performance on carbon fibre and titanium stacked materials and shows benefits on thin-walled components. The geometry reduces burr formation and gives predictable tool life.

Safe and even wear at the cutting edge improves performance for longer production runs, where high machine security is a high priority. CoroDrill Delta-C R846 is standard stocked but is made even more flexible as it can be produced to specific applications through Tailor Made.

Example of benefit using CoroDrill Delta-C R854 versus competitor drill

Competitor drill CoroDrill Delta-C R854

New point geometry for reduced delamina-tion and splittering.

Carbon fibre/titanium stacked materials

Head office: AB Sandvik Coromant SE-811 81 Sandviken, Swedenwww.sandvik.coromant.com E-mail: info.coromant@sandvik.com

C-1200:307 ENG/01 © AB Sandvik Coromant 2009.01