Drilling process (5)

2023. 10. 16. 00:02Substrates

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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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