Coordinate Measurement Machine Thermal Error Compensation
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Solution Overview
Problem
Coordinate measurement machines experience measurement errors due to thermally induced structural deformations in components with elongated prismatic shapes, caused by differential thermal expansion between structural and guide elements with different materials and properties, leading to curvature and geometrical changes.
Innovation Solution
A method that compensates for these errors by applying a correction factor to geometric compensation algorithms based on temperature changes, using a temperature sensor to calculate curvature, and incorporating the difference in linear thermal expansion coefficients, elastic characteristics, and structural analysis to update the compensation map in real time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If structural element and guide elements are made of different materials to optimize functional characteristics, then manufacturing precision and functional performance are improved, but measurement precision deteriorates due to differential thermal expansion
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting compensation parameters based on temperature measurements. The system continuously monitors temperature and updates the compensation map with corrected positional data, transforming the thermal expansion effect from a static error source into a compensatable variable parameter.
Solution Approach 2:
The patent implements feedback by using temperature sensors to continuously monitor thermal conditions and feeding this information back into the compensation algorithm. The measured temperature data drives real-time updates to the compensation map, creating a closed-loop system that adapts to thermal variations.
2Measurement precision
If temperature monitoring and real-time compensation are implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by integrating the temperature sensor into the existing machine structure and using the compensation map update mechanism within the existing control system. The same computational resources and control algorithms used for normal operation are leveraged for thermal compensation, avoiding dedicated separate systems.
Solution Approach 2:
The system applies self-service by using the machine's own operational parameters (temperature readings from integrated sensors) to automatically adjust and correct measurement errors. The compensation system serves itself by continuously updating based on real-time conditions without requiring external intervention.
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 method effectively reduces measurement errors by continuously updating corrections in real time, ensuring precision and accuracy by accounting for thermal distortions in the machine's components.
Implementation Method 1
A temperature change causes a differential length change length between the structural element 2 and the guide elements 3, due to the different linear thermal expansion coefficients
Data Source
AI summary
A method for compensating measurement errors caused by the deformation of a component defining a slide axis in a measurement machine, comprising the steps of calculating the curvature of the component as a function of the difference between the current temperature Tc and a reference temperature Tr at which the geometric compensation map of the machine has been obtained, calculating correction values for the compensation parameters stored in the compensation map as a function of the curvature, and updating the compensation map with these correction values.