Tool Arm Force Transducer Layout for Accurate Cutting Force Sensing
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Solution Overview
Problem
Existing cutting machines face inaccuracies in measuring tool force during chip-removing machining due to the placement of force transducers in a remote location, leading to indirect and less accurate measurements, which affects energy consumption and surface quality.
Innovation Solution
A cutting machine design with a force transducer positioned between the upper and lower arms of the tool arm, allowing for direct measurement of tool force in the main flow of forces, eliminating elastic deformation and maintaining conventional tool arm dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the force transducer is placed in a remote location in the machine portion, then the device complexity is reduced, but the measurement precision deteriorates due to indirect measurement and elastic deformation
Solution Approach 1:
The patent uses the tool arm as an intermediary structure to transmit the cutting force directly to the force transducer. By positioning the transducer in the tool arm rather than in a remote machine portion, the cutting force is measured directly at its point of application without being affected by elastic deformations in long transmission paths, thereby maintaining high measurement precision while avoiding excessive device complexity
Solution Approach 2:
The patent replaces the indirect mechanical stress measurement system with a direct force measurement system. Instead of measuring mechanical stress in a remote machine portion and calculating the cutting force, the force transducer directly measures the cutting force in the tool arm, eliminating the need for complex calculations and reducing measurement errors
2Measurement precision
If the force transducer is positioned in the main flow of forces between upper and lower arms, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The tool arm serves multiple functions: it holds the cutting tool, transmits cutting forces, and provides a mounting position for the force transducer. By making the tool arm multi-functional, the patent avoids adding separate measurement structures, thereby improving measurement precision without significantly increasing device complexity
Solution Approach 2:
The patent merges the force measurement function with the existing tool arm structure. The force transducer is integrated into the tool arm assembly, combining the structural function of the tool arm with the measurement function of the transducer, thereby achieving high measurement precision without creating a separate complex measurement system
3Device complexity
If indirect measurement of tool force is performed in a machine portion, then the device complexity is reduced, but the manufacturing precision deteriorates due to affected measurements
Solution Approach 1:
The tool arm acts as a direct intermediary between the cutting tool and the force transducer, eliminating the need for indirect measurement through remote machine portions. This direct measurement path ensures that the cutting force is accurately measured without being affected by variations in machine portion dimensions and mass, thereby maintaining high manufacturing precision
Solution Approach 2:
The patent replaces the indirect mechanical stress measurement system with a direct force measurement system in the tool arm. This substitution eliminates measurement errors caused by the dimensions and mass of remote machine portions, ensuring accurate cutting force measurement for maintaining manufacturing precision
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 solution provides high-accuracy tool force measurement, reducing energy consumption and improving surface quality by ensuring precise alignment and movement of tools, while being cost-effective and space-efficient.
Implementation Method 1
at least one force transducer is arranged in a position between the upper arm and the lower arm, wherein during chip-removing machining of a workpiece the at least one force transducer measures a tool force exerted by any of the required tools in the main flow of forces
Data Source
AI summary
A cutting machine includes a tool holder for holding the tools required for chip-removing machining of a workpiece, and a tool arm connecting the tool holder to a drive unit, which moves the tool arm to align one of the required tools with a workpiece in each manufacturing step. The tool arm includes an upper arm connected with the drive unit and mechanically connected to a lower arm. The lower arm is connected with the tool holder. At least one force transducer is positioned between the upper arm and the lower arm so that during chip-removing machining of a workpiece, the force transducer is capable of measuring a tool force exerted by any of the required tools in a main flow of forces.