Core Bit Cutting Section With Plug-Turn Torque Transfer
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Solution Overview
Problem
The existing methods for producing cutting sections for drill bits, such as the 'Hilti DD X-CM', require high manufacturing effort due to turning and milling processes, and have limited material selection, which affects force and torque transmission, as well as tensile loads during drilling and jammed bit removal.
Innovation Solution
A method involving a cutting section composed of a first open tubular element and a second closed tubular element, connected via a releasable plug-and-turn connection, where the second element is formed from a sheet metal part and features slot-shaped recesses for torque transmission and a transverse groove for enhanced stability, allowing for separate material selection and reduced manufacturing effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cutting sections are manufactured from a closed tubular element using turning and milling processes, then the annular stop shoulder and slot-shaped recesses can be produced, but the manufacturing effort and complexity increase significantly
Solution Approach 1:
The cutting section is divided into multiple separate components: a first tubular element, a second tubular element, and drilling segments. These components are manufactured separately and then assembled together, eliminating the need for complex turning and milling operations on a single closed tubular element. The segmentation allows each component to be produced using simpler manufacturing processes.
Solution Approach 2:
Instead of starting with a closed tubular element and removing material through turning and milling to create the annular stop shoulder and slot-shaped recesses, the invention inverts the approach by assembling open tubular elements and adding features through joining processes. This reverse methodology simplifies manufacturing by avoiding subtractive machining of complex geometries.
2Strength
If cutting sections are manufactured from a closed tubular element, then structural integrity is maintained, but material selection is limited and compromises must be made regarding force transmission, torque transmission, and tensile loads
Solution Approach 1:
The cutting section is segmented into multiple components that can be manufactured from different materials optimized for specific functions. The first tubular element can be selected for force transmission, the second tubular element for torque transmission, and drilling segments for cutting performance. This segmentation enables tailored material selection without compromising overall structural integrity.
Solution Approach 2:
The cutting section employs a composite structure consisting of multiple tubular elements and drilling segments made from different materials. Each material is selected to optimize specific performance characteristics such as strength, toughness, or wear resistance. The composite construction allows the cutting section to simultaneously achieve high force transmission, torque transmission, and tensile load capacity through appropriate material pairing.
3Ease of manufacture
If a single closed tubular element is used for the cutting section, then manufacturing is simplified, but the ability to handle tensile loads during jammed bit removal is compromised
Solution Approach 1:
The cutting section is segmented into a first tubular element and a second tubular element connected by a connection element. This segmentation creates a dedicated load path for tensile forces during jammed bit removal, with the connection element specifically designed to handle these loads. The segmented structure maintains manufacturing simplicity while significantly improving tensile load capacity.
4Ease of operation
If detachable connection devices are used for plug-and-rotate connection, then the cutting section can be released from the drill shaft, but the connection complexity increases
Solution Approach 1:
The connection device incorporates dynamic features including a spring element that enables automatic engagement and disengagement. The spring-loaded mechanism allows the cutting section to be easily released from the drill shaft by overcoming the spring force, providing a simple operational interface despite the internal mechanical complexity. This dynamic design facilitates quick release of jammed bits while maintaining a relatively simple overall structure.
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
The invention relates to a method for producing a cutting section consisting of a first, open tube element (14) embodied as a first hollow cylinder, a second, closed tube element (15) embodied as a second hollow cylinder, and at least one boring segment (16) which is connected to the first, open tube element (14) and the second, closed tube element (15).