Percussive Drill Bit Wear Shield Placement
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Solution Overview
Problem
Percussive drill bits experience premature wear and 'button pop-out' of wear-resistant inserts, leading to reduced operational life and penetration rates, as the steel body wears away faster than the inserts, limiting their effectiveness in drilling.
Innovation Solution
A percussive drill bit design featuring a wear shield located exclusively on the trailing side of each exhaust port, providing targeted protection against 'body wash' and extending the operational life by reducing wear on the drill bit body, while maintaining the benefits of wear-resistant button inserts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If wear-resistant button inserts are provided on the bit impact face, then the operational life of the drill bit is extended, but the steel body of the drill bit wears away prematurely compared to the button inserts
Solution Approach 1:
The patent applies local quality by providing wear shields only in specific high-wear zones adjacent to exhaust ports rather than covering the entire impact face. This targeted approach protects the most susceptible areas to body wash while maintaining the cost-effectiveness and performance benefits of button inserts in other regions.
Solution Approach 2:
The patent uses composite materials by combining the steel drill bit body with wear-resistant wear shields made of different materials (such as tungsten carbide or other hardfacing materials). This composite structure allows the steel body to provide structural integrity while the wear-resistant shields protect against premature wear in critical areas.
2Reliability
If wear shields are provided on the drill bit body, then protection against body wash is improved, but the cost of additional wear resistant materials increases
Solution Approach 1:
The patent implements local quality by strategically placing wear shields only in the high-wear zones adjacent to exhaust ports where body wash occurs, rather than covering the entire impact face. This localized protection reduces the quantity of expensive wear-resistant materials needed while still providing effective protection where it is most needed.
Solution Approach 2:
The patent applies partial action by providing wear shields only in the specific zones most susceptible to body wash rather than uniformly across the entire impact face. This partial coverage is sufficient to address the primary wear mechanism while minimizing material costs.
3Ease of manufacture
If the wear shield is located only on the trailing side of exhaust ports, then targeted protection is provided where body wash originates, but coverage of other potentially worn areas is reduced
Solution Approach 1:
The patent applies local quality by positioning wear shields specifically on the trailing sides of exhaust ports where body wash originates and causes the most damage. This targeted placement optimizes protection efficiency by concentrating wear-resistant material in the zones experiencing the highest wear rates.
Solution Approach 2:
The patent converts the harmful effect of exhaust port positioning (which creates body wash zones) into a benefit by strategically placing wear shields in these same locations. The harmful body wash phenomenon is acknowledged and countered by targeted protection, turning the problem area into a controlled zone with enhanced durability.
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 wear shield significantly prolongs the drill bit's operational life and penetration rate by protecting the most susceptible areas, reducing material costs and postponing button pop-outs, thereby enhancing the drill bit's overall performance and cost-effectiveness.
Implementation Method 1
The wear shield provides targeted protection against 'body wash', which is commonly known to be the gradual wearing away of the drill bit body over time
Implementation Method 2
an internal conduit for supplying pressurised fluid to the impact face, at least one exhaust port in the impact face and in fluid communication with the internal conduit
Data Source
Figure 1~2
Figure 3~4
AI summary
This disclosure relates to a percussive drill bit comprising PCD studs and a hard facing material that is strategically located to minimise stud pop outs and the amount of hard facing material used.