Tool Holder Force Transducer Layout for Accurate Cutting Force Measurement
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Solution Overview
Problem
Existing cutting machines measure tool force inaccurately due to indirect measurement at a point remote from the cutting blade, leading to poor accuracy and increased abrasion, energy consumption, and reduced surface quality.
Innovation Solution
A cutting machine equipped with a tool holder that holds multiple tools and a tool slide, featuring at least two single-component force transducers arranged between the tool holder and slide to measure the tool force directly and accurately, with a redundant measurement system to account for positional variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a multi-component force transducer is used to measure all force components, then measurement completeness is improved, but device complexity and cost increase
Solution Approach 1:
The patent divides the force measurement task into multiple single-component transducers, each measuring one force component (Fx, Fy, or Fz). These segmented transducers are distributed at different positions on the tool holder, replacing a single complex multi-component transducer. This segmentation reduces individual transducer complexity while achieving complete force measurement through aggregation of multiple simple measurements.
2Ease of manufacture
If a force transducer is placed in a force shunt, then installation is simplified, but measurement accuracy deteriorates
Solution Approach 1:
The patent extracts the force transducers from the force shunt configuration and places them directly at the tool holder where the tool force acts. This extraction eliminates the indirect measurement path through the shunt, allowing direct measurement of the tool force components at their point of application, thereby improving accuracy while maintaining installation feasibility.
3Measurement precision
If multiple single-component force transducers are used, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent employs multiple single-component force transducers that can be universally applied to measure different force components (Fx, Fy, Fz) at various positions on the tool holder. Each transducer performs the same basic function (measuring one force component), but their collective arrangement provides comprehensive three-dimensional force measurement capability, achieving multi-functionality through simple, identical units rather than complex specialized devices.
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 solution provides high-accuracy, cost-effective, and space-efficient measurement of tool force, reducing abrasion and energy consumption while maintaining surface quality and dimensional accuracy.
Implementation Method 1
at least two single-component force transducers which are configured and disposed to measure a tool force exerted by one of the required tools during the chip-removing machining of a workpiece in the direction of the main force connection
Data Source
AI summary
A cutting machine configured for the chip-removing machining of a workpiece includes a plurality of required tools. Each tool can exert a tool force onto the workpiece. The cutting machine includes a tool holder for simultaneously holding all of the tools required for operating on the workpiece. A tool slide moves the tool holder to successively align one of the tools to operate on the workpiece, and the tool and the workpiece are movable for chip-removing machining in each manufacturing step. The tool holder includes at least two single-component force transducers. Each single-component force transducer measures a tool force exerted by one of the tools during the chip-removing machining of the workpiece in a force main connection.