Drill Bit Cutting Section Resilient Slot Design
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Solution Overview
Problem
Existing cutting sections for drill bits often unintentionally disconnect from the drill shaft when attempting to free a jammed bit, leading to instability and increased risk of misalignment during core drilling, and lack sufficient stability against tensile loads.
Innovation Solution
The cutting section features slot-shaped recesses extending from the outer to the inner lateral surface, with a groove parallel to the axis of rotation forming a positive connection with the drill shaft, and resilient sections that can be adjusted for stability, along with a driving and securing area to prevent unintentional disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cutting section uses a detachable plug-and-rotate connection with L-shaped recesses, then the ease of operation for assembling and disassembling is improved, but the reliability of the connection during drilling operations deteriorates
Solution Approach 1:
The plug element is designed with resilient sections that can dynamically deform under load. When tensile forces act on the connection, the resilient sections deform to absorb the force, preventing unintentional disconnection. This dynamic behavior allows the connection to maintain reliability under varying operational conditions while still allowing controlled assembly and disassembly.
Solution Approach 2:
The resilient sections act as pre-configured cushioning elements that absorb unexpected tensile loads before they can cause disconnection. By incorporating these energy-absorbing elements in advance, the design protects against the harmful effect of sudden forces that might otherwise cause the cutting section to detach from the drill shaft.
2Ease of operation
If the slot-shaped recesses are made deep to allow pin element insertion, then the ease of operation is improved, but the stability against tensile loads deteriorates
Solution Approach 1:
The plug element combines rigid sections (for structural stability and pin insertion) with resilient sections (for tensile load absorption). This composite structure integrates materials or regions with different mechanical properties to simultaneously achieve ease of pin insertion and stability against tensile loads during drilling operations.
Solution Approach 2:
The design changes the mechanical parameters of the plug element by introducing resilient sections with different stiffness characteristics. These sections have controlled deformation properties that allow them to yield under tensile stress, thereby maintaining the overall stability of the connection while accommodating pin insertion requirements.
3Ease of operation
If the connecting slot is made wide to facilitate pin insertion, then the ease of operation is improved, but the resistance to tensile stress deteriorates
Solution Approach 1:
The resilient sections provide dynamic resistance to tensile stress by deforming under load. Even though the connecting slot is wide for easy pin insertion, the resilient material surrounding the slot can elastically deform to absorb tensile forces, maintaining connection strength without requiring a narrow slot that would hinder insertion.
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
Cutting portion (11), which is rotatable in a direction of rotation (21) about an axis of rotation (22), having: an annular portion (13), one or more cutting elements (14), which are fastened to a first end of the annular portion (13), and an insertion element (15), which is connected to the annular portion (13) at an end that is remote from the cutting elements (14). The insertion element (15) has at least one slit-shaped clearance (26) with a cross-slit (33) and a connecting slit (34), wherein the cross-slit (33) is arranged perpendicularly in relation to the axis of rotation (22) and is connected by way of the connecting slit (34) to an upper edge (35) of the insertion element (15).