Micro-Drill Asymmetric Spiral Grooves for PCB Dust Exhaustion
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Solution Overview
Problem
Micro-drills used in PCB manufacturing face challenges with poor dust-exhaustion and precision due to asymmetric spiral grooves and debris accumulation, leading to overheating and reduced drilling accuracy.
Innovation Solution
A micro-drill design featuring a first spiral groove extending to the drill tail, a symmetrically arranged second spiral groove, and a biasing groove in front of the drill point, with specific intersections and dimensions to enhance dust separation and heat dissipation, including a biasing groove that intersects with the second spiral groove and rear face to improve air-pumping efficiency and heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If asymmetric spiral grooves are used in the drill, then debris removal capability is improved, but the drill centroid deviates from the drill axis causing excessive movement and reduced hole site precision
Solution Approach 1:
The patent applies asymmetry in a controlled manner by making the first and second spiral grooves asymmetric with respect to the drill centerline. Specifically, the first spiral groove has a larger groove width and deeper depth compared to the second spiral groove, creating asymmetric debris removal channels that prevent debris accumulation while maintaining drill balance through compensating design features.
Solution Approach 2:
The patent implements local quality by varying the dimensions of spiral grooves at different locations. The first spiral groove (with larger width and depth) is positioned to handle heavier debris load, while the second spiral groove (with smaller width and depth) handles lighter debris. This localized differentiation optimizes debris removal efficiency without compromising overall drill precision.
2Manufacturing precision
If the second spiral groove is made as a blind channel to reduce debris accumulation, then hole site precision improves, but debris collects in the blind channel causing dry friction and heat generation
Solution Approach 1:
The patent applies preliminary action by designing the first spiral groove to extend all the way to the tail end of the drill, creating a continuous debris egress path before debris can accumulate in the second spiral groove. This ensures that debris is removed proactively rather than allowing it to collect and cause friction-induced heating.
Solution Approach 2:
The patent introduces air suction as an intermediary mechanism to actively remove debris from the drilling area. The air suction system works in conjunction with the spiral grooves to抽吸 (suck away) debris particles, preventing them from accumulating in the second spiral groove and causing dry friction, while also cooling the drill point.
3Object-generated harmful factors
If excessive debris is discharged by the first spiral groove, then debris removal is improved, but air suction power is lost in the first spiral groove affecting heat dissipation
Solution Approach 1:
The patent applies partial action by dividing the debris removal function between two spiral grooves with different capacities. The first spiral groove handles the majority of debris removal (excessive action for its size), while the second spiral groove handles residual debris. This distribution prevents excessive debris from overwhelming the air suction system in a single location, reducing energy loss.
Solution Approach 2:
The patent segments the debris removal function into two distinct spiral grooves with different characteristics. The first spiral groove is designed with larger dimensions for primary debris evacuation, while the second spiral groove handles secondary debris removal. This segmentation allows the air suction system to work more efficiently by distributing the debris removal load across multiple pathways rather than concentrating it in one groove.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design improves dust separation and heat dissipation efficiency, reducing debris accumulation and maintaining drill strength, thereby enhancing precision and reducing overheating issues during the drilling process.
Implementation Method 1
air suction of the drill used to remove the debris
Implementation Method 2
affecting heat dissipation of the drill point
Data Source
AI summary
A micro-drill includes a first rake face, a first rear face, a second rake face, a second rear face, a first spiral groove extending from a drill point to a tail of the drill, a second spiral groove symmetrically arranged about the first spiral groove, and a biasing groove arranged in front of the drill point. Where the first rake face, the first rear face, the second rake face, and the second rear face are arranged on the drill point. The first spiral groove and the first rake face intersect to form a first cutting edge, and the second spiral groove and the second rake face intersect to form a second cutting edge. The biasing groove and the second rake face intersect to make a length of the second cutting edge be less than a length of the first cutting edge, and the biasing groove and the second spiral groove intersect each other.