Force-Sensing Tool Holder With Split Torsion and Bending Zones
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Solution Overview
Problem
Existing machine tool sensors face challenges in accurately detecting torsional and bending forces due to coupling effects, leading to reduced sensing performance.
Innovation Solution
A tool holder with distinct sensing portions and force sensors, where one portion senses torsional force and the other senses bending force, with differing stiffness to minimize interference and enhance measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple sensors are used to detect multi-axial forces simultaneously, then the sensing coverage is improved, but coupling effects occur between forces leading to reduced measurement precision
Solution Approach 1:
The tool holder is divided into distinct sensing portions: a first sensing portion with first force sensors for detecting torsional force, and a second sensing portion with second force sensors for detecting bending force. This segmentation isolates the detection of different force types into separate structural zones, preventing coupling effects between multi-axial forces while maintaining comprehensive sensing coverage.
Solution Approach 2:
Different portions of the tool holder are designed with different stiffness characteristics tailored to their specific sensing functions. The first sensing portion has optimized stiffness for torsional force detection, while the second sensing portion has optimized stiffness for bending force detection. This local quality differentiation ensures each sensor operates in its optimal detection range without interference from other force components.
2Adaptability or versatility
If sensors detect both torsional force and bending force simultaneously, then multi-axial force detection capability is improved, but coupling effects reduce sensing performance
Solution Approach 1:
The tool holder structure is segmented into functionally independent sensing zones. The first sensing portion contains sensors dedicated to torsional force detection, while the second sensing portion contains sensors dedicated to bending force detection. This spatial segmentation ensures that each sensor type measures only its designated force component, eliminating coupling effects and maintaining high reliability in multi-axial force detection.
3Device complexity
If the sensing portions have the same stiffness, then structural simplicity is improved, but coupling effects occur between different force measurements
Solution Approach 1:
The tool holder employs local quality differentiation by assigning different stiffness values to different sensing portions. The first sensing portion has stiffness optimized for torsional force measurement, while the second sensing portion has stiffness optimized for bending force measurement. This localized optimization eliminates coupling effects between force measurements while maintaining overall structural integrity and avoiding excessive complexity.
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
The tool holder effectively reduces coupling effects, improving the accuracy of force measurements by optimizing the sensing portions' stiffness and symmetry, enhancing the sensitivity and efficiency of force detection.
Implementation Method 1
The at least one first force sensor is disposed in the at least one first hole and is configured to sense a torsional force
Implementation Method 2
The at least one second force sensor is disposed in the at least one second hole and is configured to sense a bending force
Data Source
AI summary
A tool holder having force sensors includes a first connection portion, a second connection portion, a first sensing portion, a second sensing portion, at least one first force sensor and at least one second force sensor. The first connection portion connects a cutting tool along an axis. The second connection portion connects a spindle along the axis. The first sensing portion having at least one first hole connects the first connection portion along the axis. The second sensing portion having at least one second hole connects the second connection portion and the first sensing portion. The first force sensor disposed in the first hole is to sense a torsional force. The second force sensor disposed in the second hole is to sense a bending force. The first sensing portion has a bending stiffness greater than that of the second sensing portion.