Drill Cutting Head Self-Clamping Coupling Mechanism
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Solution Overview
Problem
Existing rotary cutting tools, such as drills, require precise manufacturing of coupling surfaces to ensure stability, which can be challenging due to the need for accurate alignment of raised and lowered base surfaces for optimal performance.
Innovation Solution
A drill design featuring a cutting head with cap and fixation portions, and a tool shank with shank coupling portions, where pairs of head segments and shank coupling portions are in a mating relationship, allowing for self-clamping and stable coupling through torque transmission walls and fixation surfaces, enabling precise alignment and stability without requiring exact matching of base surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If both raised and lowered base surfaces are designed to be in contact for coupling, then coupling stability is improved, but manufacturing precision requirements increase significantly
Solution Approach 1:
The coupling interface is segmented into multiple contact surfaces: raised base surfaces, lowered base surfaces, and torque transmission surfaces. This segmentation allows each surface to serve a specific function, with the raised and lowered base surfaces providing stability while the torque transmission surfaces handle rotational forces, reducing the precision requirements for each individual surface.
Solution Approach 2:
The invention introduces a vertical dimension to the coupling interface by creating raised and lowered base surfaces at different heights. This multi-level configuration allows for stable coupling contact while accommodating manufacturing tolerances, as the stepped structure provides multiple contact points rather than requiring a single precise flat surface.
2Manufacturing precision
If only one base surface is designed to be in contact for coupling, then manufacturing precision requirements are reduced, but coupling stability decreases
Solution Approach 1:
The coupling interface is segmented into multiple contact surfaces: raised base surfaces, lowered base surfaces, and torque transmission surfaces. This segmentation allows each surface to serve a specific function, with the raised and lowered base surfaces providing stability while the torque transmission surfaces handle rotational forces, reducing the precision requirements for each individual surface.
Solution Approach 2:
The invention merges multiple coupling functions into a single integrated interface structure. The raised base surfaces, lowered base surfaces, and torque transmission surfaces work together as a unified coupling system, providing both stability and torque transmission capabilities while maintaining relaxed manufacturing tolerances.
3Stability of the object's composition
If precise alignment of base surfaces is required for optimal performance, then coupling stability is improved, but device complexity and assembly difficulty increase
Solution Approach 1:
The coupling interface is designed to self-align during assembly. The stepped configuration with raised and lowered base surfaces automatically guides the cutting head onto the tool shank, with the surfaces naturally finding their correct positions without requiring external alignment tools or procedures.
Solution Approach 2:
The coupling interface employs asymmetric raised and lowered base surfaces with specific geometries that provide inherent alignment guidance. The asymmetric shapes ensure that the cutting head can only be mounted in the correct orientation, eliminating the need for complex alignment procedures while maintaining coupling stability.
Data Source
AI summary
A drill in which a cutting head is releasably mounted on a tool shank. The cutting head is axially supported by the tool shank at four spaced apart axial support regions on shank support surfaces.