In the machining of carbon fiber products, many components are fabricated from carbon fiber plates, with drilling being a common requirement to meet assembly needs. However, burrs, tearing, and delamination frequently occur during drilling-especially when customers perform drilling independently. What causes these issues?
Q: Why do burrs, tearing, and delamination occur during carbon fiber plate drilling?
A: Each defect arises from distinct factors, analyzed below.
1. Causes of Burrs
During drilling, the drill bit generates axial forces that displace uncut carbon fibers at the hole's exit. As the bit rotates, these fibers form burrs, typically distributed in specific patterns. The interplay of shear and tensile forces from the bit's motion exacerbates this issue. Burr formation often indicates improper drilling speed or tool geometry.
2. Causes of Tearing
Tearing occurs when the drill bit fails to cleanly sever carbon fiber bundles in a single pass. Repeated cutting forces progressively spread the damage, enlarging tears around the hole. This defect is often linked to unsuitable tool selection (e.g., incorrect sharpness or coating).
3. Causes of Delamination
Delamination stems from incomplete resin infiltration during the prepreg layup process. During drilling, low interlayer strength-combined with heat from high-speed drilling-weakens the bond between layers, leading to separation. Static or dynamic loads during or post-drilling can worsen this issue.
Understanding these causes helps optimize drilling processes. For self-drilling, adjust tooling and parameters based on the above analysis. For high-performance carbon fiber plates, Haijin offers custom solutions-contact us for inquiries.
