Coordinate Measuring System With Thermal Expansion Compensation
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Solution Overview
Problem
Conventional coordinate measuring systems face challenges in accurately determining workpiece dimensions due to temperature-induced distortions, requiring lengthy tempering processes to achieve homogeneous temperature conditions, which is inefficient for precise measurements.
Innovation Solution
A coordinate measuring system equipped with temperature sensors and a computing device that calculates temperature-corrected 3D coordinates by considering actual temperature distributions and expansion coefficients, allowing for real-time compensation of thermal deformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the workpiece is tempered to achieve homogeneous temperature distribution, then measurement precision is improved, but the measurement time is significantly increased
Solution Approach 1:
The system performs preliminary temperature measurement and distribution analysis before the actual measurement process. By detecting the initial temperature state and using this information to calculate thermal expansion effects, the system can compensate for temperature-induced distortions without requiring the workpiece to reach thermal equilibrium, thus eliminating the need for lengthy tempering processes while maintaining measurement precision
Solution Approach 2:
The system changes the approach from physically altering the workpiece temperature (tempering) to mathematically adjusting the measurement data. By using temperature sensors to detect the actual temperature distribution and applying thermal expansion coefficients to calculate and compensate for dimensional changes, the system achieves accurate measurements at any temperature state without requiring the workpiece to be tempered to a specific temperature
2Measurement precision
If conventional temperature compensation methods are used, then measurement accuracy is maintained, but the complexity of the measurement process is increased
Solution Approach 1:
The measurement system performs self-compensation by automatically detecting its own temperature state and independently calculating the thermal expansion effects. The system uses integrated temperature sensors and built-in computational algorithms to automatically adjust measurement data, eliminating the need for external tempering equipment or complex manual compensation procedures, thus reducing overall process complexity while maintaining accuracy
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 high-precision measurements by reducing preparation time and accounting for inhomogeneous temperature distributions, providing accurate dimensional data without the need for lengthy tempering processes.
Implementation Method 1
at least one temperature sensor (5, 5A, 5B) that is configured to determine one or more actual temperature values of the object
Implementation Method 2
the computing device is configured to determine, based on the determined 3D coordinates of the measurement points, on the provided temperature data and on the expansion coefficients, tempered coordinates of the object
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3
AI summary
The invention pertains to a coordinate measuring system for determining 3D coordinates of an object (2), comprising a coordinate measuring device (1) comprising an arrangement of sensors configured to generate measurement data from which 3D coordinates of measurement points on the object are derivable, and a computing device configured to determine, based on the measurement data, 3D coordinates of the measurement points, and for storing nominal data of the object in a data storage, the nominal data comprising nominal dimension data of the object for a pre-defined temperature, wherein the nominal data comprises one or more expansion coefficients of the object, the coordinate measuring system comprises at least one temperature sensor (5A, 5B) that is configured to determine actual temperature values of the object, the at least one temperature sensor is configured to generate temperature data based on the determined actual temperature values and to provide the temperature data to the computing device; and the computing device is configured to determine, based on the determined 3D coordinates of the measurement points, on the provided temperature data and on the expansion coefficients, tempered coordinates of the object, wherein the determined actual temperature values of the object deviate from the pre-defined temperature, and the tempered coordinates are three-dimensional coordinates that the object would have at a tempered state in which the object uniformly has the pre-defined temperature.