Ceramic Calibration Artifact Thermal Stability
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Solution Overview
Problem
Coordinate measuring machines (CMMs) face accuracy degradation due to manufacturing imperfections, environmental factors, and thermal expansion differences between ceramic and steel components in existing calibration artifacts, leading to measurement inaccuracies.
Innovation Solution
A unitary calibration artifact made entirely of ceramic material with parallel, planar measurement surfaces and a neutral bending axis, designed to reduce thermal expansion errors and maintain structural integrity, ensuring consistent and accurate distance measurements across varying temperatures and orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a calibration artifact is made from ceramic material, then thermal expansion errors are reduced, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple components (base, steps, and alignment features) into a single unitary ceramic artifact. This eliminates the need to assemble multiple ceramic components, thereby reducing manufacturing complexity while maintaining the low thermal expansion benefits of ceramic material for improved measurement accuracy.
Solution Approach 2:
The patent utilizes the inherent parameter of ceramic material (low coefficient of thermal expansion) to reduce thermal expansion errors. By selecting and utilizing this material parameter, the artifact maintains dimensional stability across temperature variations, improving measurement precision without requiring active temperature control or compensation mechanisms.
2Measurement precision
If multiple ceramic components are assembled, then measurement accuracy improves, but structural integrity deteriorates
Solution Approach 1:
The patent combines multiple previously separate ceramic components (base and steps) into a single unitary structure. This eliminates interfaces and potential misalignments between components, thereby improving structural integrity and stability while maintaining the measurement accuracy benefits of precise ceramic dimensions.
3Ease of manufacture
If ceramic and steel components are combined, then manufacturing ease improves, but thermal expansion errors increase
Solution Approach 1:
The patent employs homogeneity by using a uniform ceramic material throughout the entire artifact structure. This eliminates the thermal expansion mismatch that occurs when combining ceramic and steel components. The homogeneous ceramic construction ensures consistent thermal behavior, preventing measurement errors while maintaining manufacturing feasibility through single-material processing.
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 ceramic calibration artifact minimizes thermal expansion errors and structural deformations, providing stable and accurate measurements, thereby enhancing the reliability and longevity of CMM accuracy verification processes.
Implementation Method 1
thermal expansion differences between ceramic and steel components in existing calibration artifacts, leading to measurement inaccuracies
Implementation Method 2
a unitary calibration artifact made entirely of ceramic material with parallel, planar measurement surfaces and a neutral bending axis, designed to reduce thermal expansion errors and maintain structural integrity
Data Source
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AI summary
A calibration artifact includes an elongated body made substantially entirely of ceramic material and having a direction of elongation. A plurality of measurement elements comprising the ceramic material are integrally formed with the elongated body, each measurement element comprising a first planar measurement surface facing in a first direction. The first planar measurement surface of each measurement element is parallel to the first planar measurement surface of each of the other first planar measurement surfaces of the plurality of measurement elements. The calibration artifact may be a unitary step gauge formed with a single piece of ceramic material.