Drill Bit Segmented Crown Reinforcement
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Solution Overview
Problem
Existing drill bits are prone to segment breakage due to brittleness, leading to premature wear and the need for frequent replacement, and are not suitable for wet drilling as they restrict water flow, resulting in reduced drilling efficiency and uneven abrasion.
Innovation Solution
A drill bit design featuring a support member with a longitudinally extending passageway and an annular crown with slots and reinforcing members that extend circumferentially across the slots, enhancing the robustness of the segments and allowing for deeper penetration and improved water flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the openings between segments in the crown are made deeper, then water and debris can flow out more effectively, but the segments become more prone to breaking due to the brittleness of the crown material
Solution Approach 1:
The crown is divided into multiple segments separated by openings, allowing water and debris to flow through while maintaining structural integrity. The segmentation enables both deep openings for flow efficiency and reinforced segments for durability.
Solution Approach 2:
The crown is made of a composite material mixture of metal and diamonds, combining the strength and toughness of metal with the hardness of diamonds. This composite structure allows for deeper openings without increasing segment breakage risk, as the metal matrix provides ductility while diamonds provide cutting capability.
2Reliability
If the segments are made smaller to reduce breakage risk, then the openings can be shallower and more reliable, but the drill bit wears out faster requiring frequent replacement
Solution Approach 1:
The use of composite materials (metal and diamonds) allows segments to be both small and durable. The metal provides toughness to prevent breakage while the diamond particles embedded in the metal maintain cutting efficiency over extended periods, extending drill bit service life despite smaller segment size.
Solution Approach 2:
The crown material has locally optimized properties with diamonds concentrated in the cutting surfaces for hardness and wear resistance, while the metal matrix provides overall structural toughness. This local quality distribution allows small segments to be both reliable and long-lasting.
3Productivity
If the crown material is made harder to improve cutting efficiency, then drilling performance increases, but the material becomes more brittle increasing segment breakage risk
Solution Approach 1:
The composite material combines hard diamond particles for cutting efficiency with a tougher metal matrix that prevents brittle failure. The diamonds provide the hardness needed for efficient drilling while the metal provides ductility and fracture toughness, resolving the contradiction between hardness and brittleness.
Solution Approach 2:
The material properties are optimized by controlling the composition, particle size distribution, and bonding characteristics of the diamond-metal composite. By adjusting these parameters, the material achieves both high hardness for drilling efficiency and appropriate toughness to prevent brittle breakage.
4Reliability
If the drill bit is removed from the bore to replace a worn or damaged bit, then a new bit can be installed, but significant time is lost in the replacement process
Solution Approach 1:
The drill bit is designed with replaceable crown segments that can be quickly swapped out when worn or damaged. Rather than replacing the entire expensive bit assembly, only the relatively inexpensive crown segments need replacement, significantly reducing both cost and downtime. The modular design allows rapid installation of new segments without removing the entire bit from the bore.
Data Source
AI summary
A bit for drilling a hole. The bit includes a support member, the support member having a passageway extending substantially longitudinally therethrough; a substantially annular crown defining a crown distal end and a crown proximal end, a radially inwardly located crown inner surface and a radially outwardly located crown outer surface, the crown extending from the support member; a slot extending between the crown inner and outer surfaces from the crown distal end substantially longitudinally towards the crown proximal end, the slot defining a slot first side wall, a substantially circumferentially opposed slot second side wall and a slot proximal wall extending therebetween substantially opposed the crown distal end; and a reinforcing member extending substantially circumferentially across the slot between the slot first and second walls; wherein the slot includes a slot proximal segment extending between the reinforcing member and the slot proximal wall and a slot distal segment extending between the reinforcing member and the crown distal end.