Core Bit Cutting Section With Split Tube Load Paths
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Solution Overview
Problem
The existing methods for manufacturing cutting sections for drill bits, such as the 'Hilti DD X-CM', face high production costs due to turning and milling processes, and are limited in material selection, compromising power transmission, torque transmission, and tensile loads when removing a jammed drill bit.
Innovation Solution
The method involves producing a cutting section with a closed tubular element formed from two sheet metal parts, where power transmission is handled by one tubular element and torque transmission by another, allowing for separate material selection and reducing manufacturing complexity by eliminating the need for turning and milling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cutting sections are manufactured from a closed tube element using turning and milling processes, then power transmission and torque transmission are achieved, but manufacturing costs increase and material selection is limited
Solution Approach 1:
The cutting section is divided into multiple separate sheet metal parts (first sheet metal part, second sheet metal part, third sheet metal part) that are formed and joined together to create a modular structure. This segmentation allows each part to be manufactured independently using cost-effective sheet metal forming processes rather than expensive turning and milling of a single closed tube, while still achieving the required power and torque transmission functions through the assembled structure.
Solution Approach 2:
The invention uses multiple sheet metal parts that can be made from different materials optimized for their specific functions. The first sheet metal part can be optimized for power transmission, the second for torque transmission, and the third for tensile load resistance, allowing composite construction that exceeds the performance of a single-material closed tube while reducing overall manufacturing cost.
2Strength
If cutting sections are manufactured from a closed tube element, then structural integrity is maintained, but material selection is compromised for tensile loads when removing a jammed drill bit
Solution Approach 1:
Each sheet metal part is designed with specific material properties tailored to its local function: the first sheet metal part uses materials optimized for power transmission, the second for torque transmission, and the third for withstanding tensile loads during jammed drill bit removal. This local optimization of material quality in different parts achieves superior overall performance compared to using a single material for the entire closed tube structure.
3Manufacturing precision
If turning and milling processes are used to produce annular stop shoulder and slotted recesses, then functional features are created, but manufacturing complexity and cost increase
Solution Approach 1:
The invention extracts the complex turning and milling operations from the manufacturing process by forming the annular stop shoulder and slotted recesses directly into sheet metal parts using forming techniques. The annular stop shoulder is formed on the first sheet metal part and the slotted recesses are formed on the second sheet metal part during the forming process itself, eliminating the need for subsequent expensive and complex turning and milling operations while maintaining the required functional precision.
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
The invention relates to a method for producing a cut section from a closed tubular element (14) which is designed as a hollow cylinder, and one or more drilling segments (16) which are joined to the close tubular element (14).