Drill Torsion Angle Optimization for PCB Hole Precision
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Solution Overview
Problem
Conventional drills used for printed wiring boards experience positional shifts and irregularities in hole formation, leading to reduced electrical connectivity and reliability, especially when drilling small diameters or with increased use frequency, resulting in early degradation and failure.
Innovation Solution
A drill with a distal end blade portion and a continuous shaving discharge groove, where the torsion angle of the groove is between 30 degrees to 50 degrees, and the distal end angle is between 110 degrees to 150 degrees, is used to improve hole precision and reduce wear, ensuring consistent drilling performance even at high use frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional drill is used for drilling small diameter through holes in printed wiring boards, then drilling can be performed, but positional shift from desired position occurs and hole precision deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the torsion angle of the shaving discharge groove to a specific range (30-50 degrees) and the distal end angle of the blade portion to (110-150 degrees). These precise parameter specifications improve hole precision and prevent positional shifts, thereby maintaining electrical connectivity reliability in small diameter drilling operations.
2Productivity
If a conventional drill is used with high use frequency, then productivity is maintained, but the drill causes positional shifts and irregularities leading to early degradation
Solution Approach 1:
The patent optimizes geometric parameters including the torsion angle (30-50 degrees) and distal end angle (110-150 degrees) to enhance drill performance and longevity. These parameter optimizations allow the drill to maintain hole precision and prevent positional shifts even during high-frequency use, ensuring consistent electrical connectivity without early degradation.
3Manufacturing precision
If the drilling diameter is reduced to achieve high density, then board density increases, but the frequency of failure increases
Solution Approach 1:
The patent applies parameter changes by specifying precise angular parameters for the shaving discharge groove (30-50 degrees torsion angle) and blade portion (110-150 degrees distal end angle). These optimized parameters enable successful drilling of small diameter holes (400 microns or less) required for high density boards while maintaining drill reliability and reducing failure frequency.
4Productivity
If multiple printed wiring boards are drilled simultaneously to enhance processing efficiency, then productivity increases, but positional shift occurs on lower side boards
Solution Approach 1:
The patent optimizes the torsion angle of the shaving discharge groove to (30-50 degrees) and the distal end angle of the blade portion to (110-150 degrees). These parameter optimizations improve drilling stability and reduce positional shifts, enabling consistent hole precision across multiple simultaneously drilled boards while maintaining high processing efficiency.
Data Source
AI summary
A drill in which no positional shift on a drilled hole and no irregularities on an internal wall are formed. A torsion angle of a shaving discharge groove of a drill is set in the range of 30 degrees to 50 degrees. In this manner, a positional shift of a through hole to be drilled can be reduced. In addition, shavings of the drill are properly discharged, and thus, drilling is not precluded by the shavings. Therefore, a printed wiring board having excellent electric connectivity and reliability can be obtained.