Drill Bit Cutting Section with Split Tubular Force and Torque Paths
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Solution Overview
Problem
The existing cutting sections for drill bits, such as the 'Hilti DD X-CM', have high production costs due to turning and milling processes, and limited material choices, compromising force, torque, and tensile loading performance.
Innovation Solution
A method to produce a cutting section by forming a closed tubular element from two sheet metal parts, allowing separate optimization of force and torque transmission, using a releasable connecting device with pin elements and slot-shaped recesses, and allowing for different material choices for each component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a closed tubular element is produced from a single material using turning and milling processes, then the structural integrity and force transmission are maintained, but the manufacturing cost increases and material choice is limited
Solution Approach 1:
The cutting section is divided into two separate tubular elements (first and second tubular elements) that can be produced from different materials. This segmentation allows each element to be optimized for its specific function while enabling greater material versatility without compromising structural integrity.
Solution Approach 2:
The invention employs composite construction by combining two tubular elements made from different materials. This allows the cutting section to utilize the advantageous properties of multiple materials (e.g., combining strength, ductility, and cost-effectiveness) while avoiding the limitations of single-material designs.
2Ease of manufacture
If a single tubular element is used for the cutting section, then the structure is simple, but the transmission of force and torque cannot be optimized separately
Solution Approach 1:
The cutting section is segmented into two tubular elements with distinct functions: the first tubular element is optimized for force transmission while the second tubular element is optimized for torque transmission. This functional segmentation allows each element to be designed and manufactured for its specific purpose, improving overall reliability.
Solution Approach 2:
Each tubular element is designed with local quality tailored to its specific function. The first tubular element has properties optimized for withstanding axial forces, while the second tubular element has properties optimized for withstanding torsional loads, allowing each component to perform its specific function at optimal efficiency.
3Manufacturing precision
If turning and milling processes are used to produce the annular stop shoulder and slot-shaped recesses, then the precision and functionality are achieved, but the manufacturing outlay increases
Solution Approach 1:
The required geometries (annular stop shoulder and slot-shaped recesses) are incorporated into the tubular elements during the forming process itself, rather than requiring subsequent turning and milling operations. This preliminary action reduces manufacturing steps and costs while maintaining the necessary precision for functional performance.
Data Source
AI summary
A method for producing a cutting section from a closed tubular element (14) which is in the form of a hollow cylinder and from one or more drill segments (16) which are connected to the closed tubular element (14).