Piloted Rock Drill Bit Centering and Debris Ejection
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Solution Overview
Problem
Prior piloted rock drill bits often skip when starting a hole on a flat rock surface, struggle to maintain centering, and are prone to waste debris plugging and high manufacturing costs.
Innovation Solution
A piloted rock drill bit with an integrally formed body featuring a leading pilot drill section, central reaming wings section, and mounting base section, including radially extending wings with carbide members and waste debris ejection slots, and an air delivery system to effectively clear debris, along with a crescent-shaped cutting edge for improved centering and efficient drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If prior piloted rock drill bits are used, then drilling function is provided, but the drill bit skips and is difficult to maintain centered at the desired hole location
Solution Approach 1:
The pilot drill point is formed with a spherical ball end geometry instead of a conventional pointed or flat end. This spherical shape allows the pilot point to self-center automatically when contacting the rock surface, as the sphere naturally finds its stable position at the bottom of the intended hole location. The curvature provides inherent guidance that maintains centering accuracy throughout the drilling operation, eliminating the skipping and centering difficulties experienced with prior designs.
2Productivity
If prior piloted rock drill bits are used, then rock drilling is achieved, but waste debris plugs the spaces between the reaming wings
Solution Approach 1:
The reaming section is divided into multiple separate wings rather than a solid cylindrical structure. These spaced-apart wings create open channels and flow paths between them, allowing waste debris to be efficiently evacuated from the hole through the gaps. The segmented configuration prevents debris accumulation and plugging that would occur with solid reaming structures, maintaining continuous drilling productivity.
Solution Approach 2:
The drill bit incorporates an integrated air delivery system with passages that conduct compressed air from the drill tool to the reaming section. This pneumatic system actively blows waste debris out of the hole and prevents it from plugging the spaces between the reaming wings, maintaining clear ejection paths and continuous drilling operation.
3Ease of manufacture
If prior piloted rock drill bits are used, then drilling function is provided, but manufacturing is relatively difficult and costly
Solution Approach 1:
The pilot drill section and reaming section are combined into a single integrally formed drill bit body rather than being manufactured as separate components requiring assembly. This unified structure eliminates complex joining operations, reduces the number of parts, and simplifies manufacturing processes. The integral construction maintains all necessary functional features while significantly reducing manufacturing complexity and cost compared to multi-component prior designs.
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 ensures easier centering over the desired hole location, minimizes waste debris plugging, and reduces manufacturing complexity and costs while maintaining effective drilling performance.
Implementation Method 1
The leading pilot drill section includes a post extending from the central reaming wings section towards the terminal forward end. The post includes a leading post pocket and a leading central carbide member secured in the leading post pocket. The leading central carbide member projects longitudinally beyond the post towards the terminal forward end.
Implementation Method 2
The central reaming wings section includes a plurality of wings extending radially from the longitudinal axis. Each of the wings have a wing pocket and a wing cutting carbide member secured in the wing pocket.
Implementation Method 3
The rock drill bits can be provided with central air passageways extending from the drill bit mounting base to openings at the lagging reaming wings. Accordingly, when the rock drill bits are mounted to pneumatic drills, pressurized air can be directed therethrough to the lagging reaming wings whereby rock swarf/waste debris resulting from the drilling can be blown out of the hole.
Data Source
AI summary
A piloted rock drill bit includes an integral body having a pilot drill section, a reaming section and a mounting base section extending along a longitudinal axis. The reaming section includes four wings extending from the longitudinal axis in an “X” pattern. A cutting carbide member is secured to each wing. Waste debris ejection slots extend radially into the reaming section between the wings. The pilot drill section includes a post. A leading carbide member is secured to the post. The leading carbide member includes a pair of sloped surfaces extending forwardly towards each other and intersecting at a leading cutting edge which extends perpendicular to the longitudinal axis. The leading cutting edge and sloped surfaces extend along a crescent shaped arc. An air delivery bore extends through the body to discharge openings located between the leading cutting edge and wings which extend radially perpendicular to the leading cutting edge.