Cutting Tool Shaft Recess for Accurate Strain Sensing
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Solution Overview
Problem
Existing cutting tools face challenges in accurately measuring strain due to their high rigidity, which results in small strain generation and difficulty in precise measurement.
Innovation Solution
The cutting tool incorporates an increased-diameter portion with a recessed portion in its peripheral surface, allowing for a localized reduction in rigidity, enabling accurate strain measurement by mounting a strain sensor to this reduced rigidity area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cutting tool shaft is made with high rigidity to ensure durability and precision, then the overall strength and stability are improved, but the strain generated during cutting becomes too small to be accurately measured
Solution Approach 1:
The patent applies local quality by creating a recessed portion at a specific location on the shaft's outer peripheral surface. This recessed portion locally reduces the shaft's rigidity only at that specific position, while the rest of the shaft maintains its high rigidity. The localized rigidity reduction causes strain to concentrate at the recessed portion during cutting operations, enabling accurate strain measurement by strain sensors mounted at this location, while the overall shaft strength and stability are preserved.
2Measurement precision
If a strain sensor is mounted directly on the shaft surface to measure cutting strain, then measurement capability is added, but the high rigidity of the shaft causes insufficient strain generation for accurate measurement
Solution Approach 1:
The recessed portion creates a localized zone with different mechanical properties (lower rigidity) compared to the rest of the shaft. This local modification ensures that when a strain sensor is mounted on the recessed portion, it measures amplified strain signals generated during cutting, while the overall shaft maintains its high rigidity for durability and precision cutting operations.
3Strength
If the shaft diameter is increased to improve rigidity and reduce strain, then the overall strength is improved, but the strain measurement capability is reduced
Solution Approach 1:
Instead of uniformly increasing the shaft diameter throughout, the patent introduces a recessed portion at a specific location. This local modification creates a zone of reduced rigidity that concentrates strain during cutting, enabling accurate measurement while the rest of the shaft maintains appropriate diameter and rigidity for overall structural strength and cutting performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration amplifies the strain locally, enabling high-accuracy strain measurement while maintaining the tool's overall rigidity, facilitating precise cutting and durability.
Implementation Method 1
The increased-diameter portion includes a recessed portion formed in a peripheral surface of the increased-diameter portion... This configuration amplifies the strain locally
Data Source
AI summary
A cutting tool includes a shaft portion. The shaft portion includes an increased-diameter portion having a diameter larger than a diameter of other portion of the shaft portion. The increased-diameter portion has a recessed portion formed in a peripheral surface of the increased-diameter portion.