Forged Fixed-Cutter Drill Bit Bodies for Faster Customization
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Solution Overview
Problem
The existing methods for forming fixed-cutter earth-boring drill bits are time-consuming and expensive due to the need for individual fabrication of each bit based on specific design parameters, involving multiple machining operations.
Innovation Solution
A forged steel drill bit body with pre-formed blades, junk slots, and nozzle holes is used as an intermediate structure, which can be customized by further processing to include cutter pockets and hard-facing grooves, reducing the need for extensive machining and allowing for standardized production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If individual fabrication methods are used for each drill bit based on specific design parameters, then manufacturing precision and customization are improved, but manufacturing time and costs increase
Solution Approach 1:
The drill bit body is forged in advance with pre-formed blades, junk slots, and nozzle holes before final assembly. This preliminary forging action creates a standardized intermediate structure that can be customized later by forming cutter pockets and positioning cutters, thereby reducing the time and complexity of final manufacturing while maintaining customization capability
Solution Approach 2:
The manufacturing process is segmented into distinct stages: (1) forging the drill bit body with blades and junk slots, (2) forming cutter pockets in the blades, (3) positioning cutters in the pockets, and (4) forming nozzle holes. This segmentation allows standardized production of the body while enabling customization in subsequent steps, resolving the contradiction between mass production efficiency and individual customization
2Adaptability or versatility
If multiple machining operations are performed on wrought alloy bars, then drill bit design flexibility is improved, but manufacturing complexity and costs increase
Solution Approach 1:
Multiple features that would traditionally require separate machining operations are merged into a single forging process. The drill bit body, blades, junk slots, and nozzle holes are all formed simultaneously during the forging operation, reducing manufacturing process complexity while maintaining design flexibility through subsequent cutter pocket formation and cutter positioning
3Productivity
If standardized intermediate structures are used for drill bit bodies, then manufacturing time and costs are reduced, but customization capability must be maintained
Solution Approach 1:
The standardized drill bit body maintains uniform properties for the core structure (blades, junk slots, nozzle holes), while allowing local customization through cutter pocket formation and cutter positioning. This local quality principle enables the majority of the body to be produced efficiently through standardized forging, while specific areas (cutter pockets) can be customized to meet individual drill bit design requirements
Data Source
AI summary
Methods for forming fixed-cutter earth-boring drill bits include retrieving a forged steel drill bit body from an inventory of substantially identical forged steel drill bit bodies including fixed blades and junk slots between the fixed blades. Cutter pockets are formed in the blades. Nozzle holes are formed in the drill bit body to provide fluid communication from an interior of the forged steel drill bit body to the junk slots. Additional methods include forging first and second steel drill bit bodies substantially identical in shape and configuration, forming first cutter pockets in the first steel drill bit body in a first configuration, and forming second cutter pockets in the second steel drill bit body in a second, different configuration.