Carbon fiber's exceptional strength, heat resistance, and corrosion tolerance make it a premier composite material. Yet its high hardness and brittleness pose significant machining challenges-drilling risks part damage, and material waste carries steep costs.
Key Drilling Issues
Delamination
Excessive axial force during drilling creates interlayer stress, causing resin failure and layer separation in this laminated composite.
Dimensional Instability
Low thermal conductivity induces localized heating, temporarily expanding holes. Upon cooling, the material's high elasticity and thermal contraction shrink hole diameters.
Fracture Risk
Brittleness demands precise force control: insufficient pressure impedes drilling, while concentrated force triggers cracking.
Rapid Tool Wear
Standard drills fail against carbon fiber's hardness. Even high-speed steel (HSS) or cobalt drills wear quickly, elevating consumable costs.
Optimized Approaches
Tool Selection
HSS drills: Cost-effective for balanced performance.
Cobalt drills: Superior heat dissipation and wear resistance, though higher cost limits adoption.
Process Refinement
Skilled operators minimize damage by controlling drilling duration and pressure with precision.
