Hammer-Drill Bit Geometry for Drilling Through Rebar and Rock
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Solution Overview
Problem
Existing rock drilling equipment is inefficient in penetrating metal plates or rebar without requiring a change in drill equipment, leading to increased weight, time, and safety hazards, especially in austere environments like military operations.
Innovation Solution
A specialized metal-cutting bit designed for use with hammer-drills, featuring a cylindrical body with a protuberance to prevent hammer activation, allowing for effective drilling through metal while maintaining contact with rock surfaces, reducing the need for additional equipment and minimizing downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rock drilling equipment is used to penetrate metal plates or rebar, then drilling through rock is effective, but equipment damage occurs and drilling time increases significantly
Solution Approach 1:
The patent changes the operational parameters of the hammer-drill by using a protuberance on the bit to prevent hammer activation when drilling metal, allowing the drill to operate in rotation-only mode for metal and hammer mode for rock, thus adapting parameters to match material being drilled
Solution Approach 2:
The drilling process is segmented into two distinct modes: hammer activation for rock drilling and hammer inhibition for metal drilling, controlled by the protuberance interaction with the hammer-drill mechanism. This segmentation allows each material type to be drilled with optimal parameters
2Adaptability or versatility
If a second drill or specialized equipment is carried to handle metal penetration, then metal drilling capability is improved, but equipment weight and complexity increase
Solution Approach 1:
The hammer-drill is made universal by enabling it to drill both rock and metal effectively. The protuberance-equipped bit allows the single tool to adapt its function based on material type, eliminating the need for separate specialized drills for metal and rock
3Manufacturing precision
If equipment is stopped and exchanged to drill through metal, then drilling precision is maintained, but operational time and logistics complexity increase
Solution Approach 1:
The drilling operation continues without interruption by using the protuberance mechanism to automatically adapt the hammer-drill between hammer and rotation-only modes when encountering different materials. This eliminates the need to stop, exchange equipment, or reconfigure the drill
4Strength
If hammer feature is activated when drilling metal, then rock penetration capability is maintained, but metal cutting effectiveness decreases due to rebound
Solution Approach 1:
The protuberance on the bit performs preliminary anti-action by preventing hammer activation before the hammer can strike the metal. This anticipatory measure eliminates the rebound problem by ensuring the hammer remains inactive when drilling metal, allowing continuous cutting without interruption
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
Enables continuous drilling through metal and rock materials with a single hammer-drill setup, reducing equipment needs and time, and eliminating the need for hazardous cutting torches or energetic systems, enhancing safety and operational efficiency.
Implementation Method 1
providing the bit with a minimum of one protuberance or protrusion to the shank at a point a first distance from a longitudinal end of the first section opposite the second section, wherein the first distance is selected so as to prevent full insertion of the first section into a hammer-drill chuck, and wherein the distance precludes a hammer in the hammer-drill's chuck from striking the longitudinal end of first section while the hammer-drill is in operation
Implementation Method 2
Drill equipment associated with drilling into metal relies primarily on the torsional moment applied to the drill bit to employ the bit's geometry and achieve a desired cutting action, while the axial force primarily keeps the bit in contact with the target material
Implementation Method 3
The repetitive axial force is known as a 'hammer feature' as its effect is the same as a hammer striking the end of a masonry chisel. The hammering motion breaks up the rock at the point of contact between the chisel point and the material being drilled
Data Source
AI summary
A drill bit in conjunction with a hammer-drill to penetrate composite metal and non-metal structure or structures including, for example, thick metal or rebar encountered during concrete, rock or masonry boring operations without requiring a change in drill equipment.