Coordinate Measurement Machine Guide Part Deformation Correction
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Solution Overview
Problem
Industrial machines, such as coordinate measurement machines, face measurement errors due to base deformation under workpiece load, which requires an accurate method to determine the deformation of guide parts for correction.
Innovation Solution
The implementation of a movable body with a linear encoder and detectors on a guide part, supported by non-constraining and constraining support parts, allows for the detection of relative displacement and deformation, enabling the control unit to calculate and correct for straightness and angular errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the base is made rigid to maintain measurement stability, then stability is improved, but the base cannot accommodate workpiece loads without deformation, worsening measurement accuracy
Solution Approach 1:
The base system is segmented into two independent parts: the guide part that provides mechanical support and the scale that provides measurement reference. The scale is supported by separate support parts (15a, 15b) that are independent from the guide part, allowing the guide part to deform under workpiece load while the scale remains stable and undeformed for accurate measurement.
Solution Approach 2:
Support parts (15a, 15b) are introduced as intermediary elements between the guide part and the scale. These support parts isolate the scale from the guide part's deformation, allowing the guide part to bear workpiece loads while the scale maintains its positional accuracy for precise measurement.
2Device complexity
If the scale is fixed to the guide part to simplify structure, then device complexity is reduced, but measurement accuracy deteriorates due to guide part deformation
Solution Approach 1:
The measurement system is segmented into the guide part structure and the scale component, with the scale being a separate element supported by dedicated support parts. This segmentation allows the guide part to handle mechanical loads while the scale independently provides accurate measurement reference, resolving the conflict between structural simplicity and measurement accuracy.
Solution Approach 2:
Support parts (15a, 15b) serve as intermediary elements that couple the guide part to the scale without rigidly fixing them together. This intermediary connection allows the scale to remain stable and accurate while still being structurally integrated with the guide part through the support mechanism.
3Measurement precision
If detectors are added to detect guide part deformation, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The scale and detectors form a self-service measurement system where the scale provides the measurement reference and the detectors automatically detect the relative position between the movable body and the scale. The system self-corrects for guide part deformation by continuously monitoring the relative displacement between the movable body (moving with the guide part) and the scale (fixed by support parts), eliminating the need for additional complex deformation sensing mechanisms.
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 configuration enables the precise and accurate measurement of guide part deformation, effectively correcting measurement errors caused by base deformation, ensuring high accuracy in coordinate measurement.
Implementation Method 1
a scale 52 of a linear encoder 50 that is supported on a side surface 12a of the guide part 12, detectors 56, 57 that are provided on the column 22, the detectors 56, 57 detecting a relative displacement with respect to the scale 52
Data Source
AI summary
A coordinate measurement machine includes a column that can move relative to a placement surface on which a workpiece is placed, a guide part that is provided on the placement surface, the guide part guiding the column, a scale of a linear encoder that is supported on a side surface of the guide part, and detectors that are provided on the column, the detectors detecting a relative displacement with respect to the scale. The detectors detect a displacement of the column in each of a moving direction and a vertical direction. A coordinate measurement machine further includes a deformation amount acquisition part that acquires an amount of deformation of the guide part relative to the scale on the basis of detection results of the detectors.