Tool Holder Sensor Layout for Stable Cutting Force Measurement
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Solution Overview
Problem
Existing tool holder systems face challenges in accurately measuring forces on cutting tools due to high hysteresis, instability, and space constraints, particularly when using sensors that can interfere with tool clamping stability and require complex installation.
Innovation Solution
A tool holder design with a sensor receptacle positioned at a distance from both the tool holder and machine interface, allowing the sensor to be in direct contact with neither, and aligning the sensitive axis of the sensor to match the direction of resulting forces for minimal shear stress and improved measurement linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor is positioned close to the machining point for accurate measurement, then measurement precision is improved, but the sensor interferes with tool clamping stability and creates space constraints
Solution Approach 1:
The sensor is extracted from the immediate machining area and positioned in a recess in the tool holder body, away from the cutting edge and tool clamping zone. This allows the sensor to measure forces transmitted through the tool holder without interfering with tool installation or clamping stability, resolving the contradiction between measurement precision and structural stability
2Measurement precision
If the sensor is mounted directly at the tool-cutter interface for direct force measurement, then measurement precision is improved, but device complexity and installation difficulty increase
Solution Approach 1:
The sensor is integrated into the tool holder body itself, with the sensor recess formed as part of the tool holder structure. This merging of the sensor mounting structure with the tool holder simplifies the overall device design and reduces installation complexity while maintaining measurement precision through direct force transmission path
3Measurement precision
If a multidimensional force measurement arrangement is used, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
Instead of implementing a complex multidimensional force measurement system throughout the tool holder, a single sensor is strategically positioned to measure the specific force component most relevant to the machining process. This localized measurement approach provides sufficient precision for the application while keeping the device simple and cost-effective
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 reduces hysteresis, enhances measurement stability, and simplifies tool handling by allowing precise force measurements with reduced interference and easy tool replacement without affecting sensor setup.
Implementation Method 1
the sensor is preferably a force sensor
Data Source
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Figure 3~4
Figure 5
AI summary
Tool holder (10, 10') with a tool receptacle (14, 14') configured to detachably hold a tool (12, 12') with at least one cutting edge (22, 22') for machining a workpiece, with a machine interface (26, 26') configured to allow the tool holder (10, 10') to be attached to a machine tool, and with a sensor receptacle (30, 30') in which a sensor (32, 32') is mounted, which is configured to generate a measurement signal that depends on a force acting on the tool holder (10, 10'), wherein the sensor receptacle (30, 30') is spaced apart from both the tool receptacle (14, 14') and the machine interface (26, 26') so that the sensor (32, 32') is not in contact with the tool (12, 12') or is in direct contact with the machine tool when the tool (12, 12') is held in the tool holder (14, 14') and the tool holder (10,10') is attached to the machine tool.