Modular Matrix Drill Bit Blank Assembly Design
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Solution Overview
Problem
The manufacturing process of fixed cutter drill bits is complex, time-intensive, and costly, with thermal stress and cracking issues due to the thermal impact of forming a bit body from a custom-designed steel blank and a hard metal matrix, requiring precise positioning and remaking of the bit blank for minor design changes.
Innovation Solution
A modular bit blank assembly with an annular mandrel and elongate studs of varying lengths, allowing for a universal mandrel to accommodate different spacer configurations, reducing thermal stress and enabling customization without extensive remaking of the bit blank, and a method involving securing studs to the mandrel, positioning in a mold, filling with matrix material, applying heat, and forming a rigid crown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a custom-designed steel blank is used for each drill bit, then the drill bit can be precisely tailored to specific design requirements, but the manufacturing process becomes complex, time-intensive, and costly
Solution Approach 1:
The patent applies universality by creating a standardized steel blank design that can accommodate multiple different drill bit configurations. Instead of manufacturing custom blanks for each drill bit, a universal blank serves as a base for various cutter element arrangements, thereby improving productivity while maintaining design precision through flexible configuration options.
Solution Approach 2:
The patent segments the drill bit into modular components: a standardized blank and interchangeable cutter element assemblies. The blank is divided into standardized sections with predetermined spacer positions, allowing cutter elements to be independently configured and replaced without remaking the entire blank, thus resolving the contradiction between precision and efficiency.
2Manufacturing precision
If the bit blank is precisely positioned within the mold to ensure proper placement of spacers, then manufacturing accuracy is improved, but the process complexity and time increase
Solution Approach 1:
The patent applies preliminary action by pre-positioning spacers at predetermined locations on the standardized blank before the molding process. The blank is designed with integrated spacer positions that are automatically aligned during assembly, eliminating the need for complex real-time positioning operations and reducing both complexity and time while maintaining precision.
Solution Approach 2:
The patent merges the spacer positioning function into the blank design itself. Spacers are integrated as permanent features of the standardized blank rather than separate components requiring independent positioning, thereby simplifying the overall process while ensuring consistent, precise placement across all drill bits manufactured from this blank.
3Strength
If thermal impact is applied to form the bit body from a steel blank and hard metal matrix, then a strong bonded structure is created, but thermal stress and cracking issues occur
Solution Approach 1:
The patent applies parameter changes by modifying the thermal processing parameters during the molding process. The standardized blank and matrix materials are selected and processed at controlled temperature ranges that achieve adequate bonding strength while minimizing thermal gradients and stress accumulation, thereby reducing cracking risk while maintaining joint strength.
Solution Approach 2:
The patent uses composite materials consisting of the standardized steel blank combined with hard metal matrix materials that have compatible thermal expansion properties. This composite construction reduces thermal stress by matching material properties, preventing cracking while maintaining the strong bonded structure necessary for drill bit performance.
4Adaptability or versatility
If minor design changes are made to the drill bit, then adaptability is improved, but the bit blank must be completely remade
Solution Approach 1:
The patent applies dynamics by creating a flexible, modular system where cutter element configurations can be dynamically changed without remaking the blank. The standardized blank serves as a stable base while allowing dynamic reconfiguration of cutting elements to adapt to different drilling conditions, thereby achieving design flexibility without time loss.
Solution Approach 2:
The patent enables discarding and recovering by allowing individual cutter elements or spacer configurations to be replaced or modified while retaining the standardized blank. Instead of discarding the entire blank for minor design changes, only the specific components needing change are replaced, recovering the value of the standardized blank and reducing remaking 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
This approach simplifies the manufacturing process, reduces thermal stress and cracking, and allows for customization of drill bit designs using a single mandrel, enhancing efficiency and reducing production costs while maintaining performance.
Implementation Method 1
The bit body is then either heated or molten metal is introduced to the particulate material, forming a solid bit body
Implementation Method 2
the fluid removes heat, caused by contact with the formation, from the cutter elements in order to prolong cutter element life
Data Source
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AI summary
A fixed cutter drill bit for drilling a borehole in earthen formations includes a blank assembly and a matrix crown fixably mounted to the blank assembly. The blank assembly includes an annular mandrel and a plurality of elongate studs fixably coupled to the mandrel. The mandrel has a first end distal the crown and a second end engaging the crown. In addition, the mandrel includes a plurality of bores extending axially from the second end. Each elongate stud has a first end disposed within one of the bores and a second end disposed in the crown distal the mandrel.