PCB Drill Bit Helix Angle and Land Width Optimization
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Solution Overview
Problem
Existing drill bits fail to accurately and uniformly form small diameter holes in printed circuit boards, which are crucial for reliable electrical connections among components.
Innovation Solution
A drill bit with a drill bit body featuring a helical flute with specific helix angles and land widths, designed for precise hole formation in PCBs, including a method of rotating the drill bit and moving it parallel to the PCB's longitudinal axis to penetrate through the board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional drill bits are used for drilling small diameter holes in PCBs, then the drilling process can be performed, but the hole accuracy and uniformity deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the helix angle (increasing from conventional 30° to 45-50°) and land width (decreasing to 0.08-0.1mm) of the drill bit. These parameter modifications enable the drill bit to maintain stability and precision while drilling small diameter holes (0.2-1.0mm) in PCBs, directly resolving the contradiction between manufacturing precision and connection reliability
Solution Approach 2:
The patent implements local quality by creating a specialized drill bit geometry with specific local characteristics: a narrow land width (0.08-0.1mm) at the cutting edge and a specific helix angle (45-50°) in the flute region. These localized geometric features are optimized for drilling small diameter holes in PCBs, improving hole accuracy and uniformity while maintaining electrical connection reliability
2Stability of the object's composition
If drill bit land width is increased to improve structural stability, then drilling stability improves, but hole dimension accuracy deteriorates
Solution Approach 1:
The patent resolves this contradiction by optimizing the land width parameter to a specific narrow range (0.08-0.1mm) and combining it with an increased helix angle (45-50°). This parameter combination maintains drilling stability through the enhanced helix angle while the controlled land width preserves hole dimension accuracy for small diameter holes
Data Source
AI summary
A drill bit for use in forming holes in a printed circuit board (PCB) is disclosed. The drill bit includes a drill bit body having: a drill bit tip at a first end of the drill bit body; a flute winding about the drill bit body in a helix, wherein a helix angle of the flute is between 44 and 46 degrees in the vicinity of the first end and increases with increasing distance from the first end to between 49 and 51 degrees; and a land width of between 0.08 and 0.1 millimeters.