Percussion Drill Bit Shank Wear Insert Design
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Solution Overview
Problem
Percussion drill bits, particularly top hammer type, experience significant wear and thermal degradation due to exposure during drilling, leading to overheating and potential welding with the drive rod, resulting in reduced useful life and performance.
Innovation Solution
Incorporation of superabrasive wear inserts, such as polycrystalline diamond, strategically positioned on the shank and coupling end of the drill bit to reduce wear and thermal degradation, including internal threads and tapered interfaces for enhanced durability and frictional engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the entire drill bit body is exposed during drilling operations, then the drill bit can effectively engage and penetrate the formation, but the shank and other non-cutting portions experience significant wear and thermal degradation
Solution Approach 1:
The patent applies local quality by adding wear inserts specifically to the shank and coupling end portions of the drill bit that experience wear, while leaving the cutting face and other areas unchanged. This targeted approach protects only the vulnerable non-cutting portions without interfering with the drilling function.
Solution Approach 2:
The wear inserts act as intermediary elements between the drill bit shank and the formation. These inserts absorb the wear and thermal degradation that would otherwise affect the drill bit body, serving as a protective mediator that extends the drill bit's service life.
2Reliability
If superabrasive wear inserts are added to protect the shank, then wear resistance and thermal stability improve, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies local quality by adding wear inserts specifically to the shank and coupling end portions of the drill bit that experience wear, while leaving the cutting face and other areas unchanged. This targeted approach protects only the vulnerable non-cutting portions without interfering with the drilling function.
Solution Approach 2:
The patent employs composite materials by combining the drill bit body (typically steel or alloy) with superabrasive wear inserts (such as polycrystalline diamond or cubic boron nitride). This composite construction provides the shank with enhanced wear resistance and thermal stability while maintaining the overall structural integrity of the drill bit.
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 use of superabrasive wear inserts significantly enhances the drill bit's wear resistance and thermal stability, reducing the risk of overheating and welding, thereby improving the drill bit's performance and extending its useful life.
Implementation Method 1
The threaded coupling may include a tapered neck that provides frictional engagement between the drill bit and the rod
Implementation Method 2
portions of the shank of a drill bit may experience wear, causing it to overheat and deform
Implementation Method 3
The use of superabrasive wear inserts significantly enhances the drill bit's wear resistance and thermal stability, reducing the risk of overheating and welding
Data Source
AI summary
Various drill bits, drilling systems and related methods are provided. In one embodiment, a drill bit comprises a bit body having a face and a shank, at least one insert having a convex engagement surface coupled with the face and at least one wear insert coupled with the shank. In one particular embodiment, the at least one wear insert may be positioned immediately adjacent a coupling end of the shank. The at least one wear insert may include a superabrasive table which may be bonded with a substrate. The at least one wear insert includes a wear surface defined in the superabrasive table. In one embodiment, the superabrasive table may comprise polycrystalline diamond. Similarly, the inset having a convex engagement surface may include a superabrasive material, such as polycrystalline diamond, bonded with a substrate. Such a drill bit may be used, for example, in a top hammer percussion drilling operation.