2023. 10. 16. 00:02ㆍSubstrates
Today, we will learn about the types of defects in CNC drilling and the CO2 laser process for implementing via holes.
Defect Types in Drill Process
Drill Eccentricity
Cause: Board flex abnormality / Run-out, equipment misalignment / Foreign particles on board surface
Defect Effect: Inner-layer short / Outer-layer open / Reliability issues
Odd Drill
Cause: Drill calibration misalignment / Stacking in the opposite direction / Drill equipment origin deviation
Defect Effect: Inner-layer short / Outer-layer open / Reliability issues
Hole Burr
Cause: Bit damage / Dust collection hose damage / Abnormal dust collection pressure
Defect Effect: Plating reliability issues / Void / Inability to insert components
Hole Blockage
Cause: Bit damage / Dust collection hose damage / Abnormal dust collection pressure
Defect Effect: Plating reliability issues / Void / Inability to insert components
Nail Head
Cause: Inner-layer copper expansion due to drilling temperature / Increased contact area during drilling / Excessive cutting resistance during drilling
Defect Effect: Reliability issues
Roughness
Cause: Insufficient chip evacuation / Blade chipping and bit wear / Defects in stacking formation
Defect Effect: Reliability issues
Up until now, we've covered mechanical drilling with the CNC Drill. Now, let's proceed to learn about the CO2 Laser used for implementing via holes.
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