Sensor Chuck Jaw Layout for Accurate Clamping Force Detection
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Solution Overview
Problem
Existing chuck devices face challenges in accurately monitoring clamping and cutting forces due to disturbances like centrifugal forces, friction, and wear, leading to unpredictable clamping forces and potential deformation, which affects machining accuracy and stability.
Innovation Solution
A chuck jaw design featuring duplicate strain gauges laterally arranged on the sensor jaw body, with optimized orientation and placement to measure both radial and shear forces, allowing precise evaluation of clamping situations and resistance to external influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor for detecting clamping force is arranged on a bending beam on a chuck jaw, then clamping force can be detected, but a high level of effort is required for production and assembly due to complex shaping and multiple components
Solution Approach 1:
The sensor jaw body integrates the sensor directly into the jaw body structure itself, merging the sensing function with the structural function. This eliminates the need for separate bending beam components and their associated mounting hardware, significantly reducing production effort and assembly complexity while maintaining clamping force detection capability
Solution Approach 2:
The sensor jaw body serves multiple functions simultaneously: it provides the structural support for clamping, acts as the sensing element for force detection, and integrates the electronic housing and energy storage units. This multi-functionality reduces the overall number of components needed in the chuck jaw assembly
2Stability of the object's composition
If identical chuck jaws are used for a set to ensure symmetrical structure and matching clamping properties, then balancing quality is high, but manufacturing effort and costs increase significantly
Solution Approach 1:
The patent employs chuck jaws with different geometries and mass distributions while maintaining symmetrical clamping properties through the sensor jaw body design. This allows for reduced manufacturing effort and costs by avoiding the requirement to manufacture identical complex sensor jaws, while still achieving high balancing quality through compensated mass distribution
Solution Approach 2:
The sensor jaw body is designed with specific local characteristics (supporting faces, notch geometry, strain gauge positions) that ensure symmetrical clamping behavior, while other parts of the chuck jaw can vary. This localized optimization maintains balancing quality without requiring complete identity across all chuck jaws
3Measurement precision
If strain gauges are arranged laterally on the sensor jaw body, then both radial clamping force and shear force can be measured, but the strain gauges must be positioned at optimized locations to resist external influences
Solution Approach 1:
The strain gauges are pre-positioned at specifically optimized locations on the sensor jaw body that are predetermined to be less sensitive to external influences such as variable chuck diameter and internal versus external clamping differences. This preliminary optimization of gauge placement ensures robust measurements before the actual clamping operation occurs
Solution Approach 2:
The patent uses duplicate strain gauges arranged symmetrically on both sides of the sensor jaw body. This duplication allows for differential measurement that cancels out external influences, providing more accurate force measurements by comparing the readings from both gauge locations
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
Enables accurate and robust measurement of clamping and cutting forces, reducing deformation and improving machining accuracy by providing stable and reproducible measurement results.
Implementation Method 1
The sensor is provided in duplicate as strain gauges which are arranged laterally on the sensor jaw body. The two laterally placed strain gauges measure not only the radially acting clamping force but also a shear force
Data Source
AI summary
A chuck jaw having a sensor jaw body and a sensor. A first supporting face and a second supporting face for a chuck insert are formed on the sensor jaw body, which supporting faces are not oriented parallel to each other and are connected via a notch. The sensor is provided in duplicate as strain gauges which are arranged laterally on the sensor jaw body. A chuck insert and a chuck are also provided.