Additive-Manufactured Drill Bits With Material Gradients for Wear Repair
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Solution Overview
Problem
Existing earth-boring tools, particularly drill bits, face challenges in production time, cost, and durability due to complex geometries and wear during drilling operations, with conventional manufacturing methods being inefficient and costly.
Innovation Solution
Utilizing additive manufacturing techniques, specifically direct metal deposition, to form and repair drill bits with material gradients and multiple materials, reducing production time and costs while enhancing durability through layer-by-layer application and material selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional subtractive manufacturing methods are used to form drill bits, then the drill bits can be produced with traditional geometries, but the production time and costs are significant and efficiency is low
Solution Approach 1:
The patent inverts the conventional manufacturing approach by using additive manufacturing (building up material) instead of subtractive manufacturing (removing material). This inversion allows for direct formation of complex geometries including internal fluid passageways without requiring time-consuming machining operations, thereby significantly improving production efficiency and reducing production time
Solution Approach 2:
The patent changes the manufacturing process parameters from traditional machining methods to additive manufacturing processes. This parameter change enables near-net-shape production of drill bits with complex internal structures, eliminating the need for extensive post-machining operations and substantially reducing both production time and costs
2Reliability
If wear-resistant materials are applied to high-wear areas of the bit body, then durability is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent applies wear-resistant materials selectively to high-wear areas such as blade surfaces, gage surfaces, and areas adjacent to cutter pockets. This localized application of wear-resistant properties through additive manufacturing reduces manufacturing complexity compared to applying wear-resistant coatings to entire surfaces, while still improving durability where it is most needed
Solution Approach 2:
The patent utilizes composite material structures by combining wear-resistant material layers with the base bit body material. This composite approach provides enhanced durability in high-wear zones while maintaining the overall structural integrity and simplifying the manufacturing process compared to using单一 materials throughout
3Manufacturing precision
If complex internal geometries including fluid passageways are formed by machining, then the desired geometry is achieved, but the manufacturing time and cost increase significantly
Solution Approach 1:
The patent inverts the manufacturing approach by forming complex internal geometries and fluid passageways directly during the additive manufacturing process rather than creating them through time-consuming subtractive machining operations. This inversion achieves the desired complex geometries with significantly reduced manufacturing time while maintaining precision through controlled material deposition
Solution Approach 2:
The patent utilizes the third dimension in additive manufacturing to create complex internal fluid passageways and geometries that would be difficult or time-consuming to machine. By building structures layer-by-layer, the process achieves complex 3D geometries directly, eliminating the need for extensive machining operations and substantially reducing manufacturing time
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 method reduces production time and costs by forming and repairing drill bits efficiently, achieving near-net shape and improved durability with material gradients, enhancing performance and reducing the likelihood of failure.
Implementation Method 1
additive manufacturing techniques, specifically direct metal deposition, to form and repair drill bits
Implementation Method 2
The bit body comprises a first gradient of at least two materials between an external surface of the crown region and an internal structure of the bit body
Data Source
AI summary
A downhole earth-boring rotary drill bit comprises a bit body. The bit body comprises a crown region, a plurality of cutting elements on the crown region, and wherein the bit body comprises a first gradient of at least two materials between an external surface of the crown region and an internal structure of the bit body and methods of forming and repairing the downhole earth-boring rotary drill bit using additive manufacturing.