Variable Core Reinforcement Drill Shank Rigidity
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Solution Overview
Problem
Drills with core reinforcement tend to break at the transition between the shank and the drill helix due to reduced rigidity and increased convexity, which affects long-term stability and resistance to breakage.
Innovation Solution
The drill's core reinforcement is configured with a smaller spinal width at the shank side end and a more slender design, increasing rigidity and stability while enlarging the drill dust removal groove, and featuring variable spine thickness along the drill helix to enhance impact energy transfer and reduce friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the core reinforcement is made more convex to increase drill dust removal groove volume, then the drill dust removal capability is improved, but the drill becomes more prone to breakage at the transition between shank and drill helix
Solution Approach 1:
The core reinforcement is designed with variable convexity along its length: more convex at the drill head side end to maximize drill dust removal groove volume, and less convex (more slender) at the shank side end to maintain structural rigidity and prevent breakage. This local differentiation resolves the contradiction by optimizing each region for its specific function.
Solution Approach 2:
The core reinforcement geometry transitions dynamically from a more convex configuration at the drill head end to a more slender configuration at the shank end. This gradual transition creates an optimized stress distribution that prevents sudden failure while maintaining adequate drill dust removal capacity throughout the structure.
2Reliability
If the spinal width of fluted lands is increased at the shank side end to improve rigidity, then the resistance to breakage is improved, but the drill dust removal groove volume is reduced
Solution Approach 1:
The fluted lands are designed with variable spinal width along the drill length: broader at the shank side end to provide structural support and prevent breakage, and narrower at the drill head side end to maximize drill dust removal groove volume. This local optimization resolves the contradiction between rigidity and dust removal capacity.
3Reliability
If the core reinforcement is made more slender at the shank side end to prevent breakage, then the resistance to breakage is improved, but the drill dust removal capability is reduced
Solution Approach 1:
The core reinforcement geometry is locally optimized with a more slender configuration at the shank side end to prevent breakage, while maintaining adequate overall drill dust removal capability through the cumulative volume of the drill dust removal groove and the narrower fluted lands configuration at this position.
Data Source
AI summary
A drill with a drill flute (12) includes symmetrical fluted lands (20) helically extend around a core, wherein grooves (18) remain between the fluted lands, said grooves having a width (72) that exceeds the spine thickness or width (24) of the fluted lands (20), and wherein the grooves (18) comprise a convex core reinforcement (22) at the groove bottom thereof. The width (24) of the fluted lands (20) at the drill head side end (16) is smaller than at the shank side end (14) of the drill helix (12), and at least increases in certain areas. The core reinforcement (22) at the drill head side end (16) is more convex than at the shank side end (14), thus has larger radii (40, 42).