Turning Device Error Compensation via Periodic Axis Deviation Modeling
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Solution Overview
Problem
Existing turning devices in coordinate measurement and machining technologies face errors due to various sources, such as translational and rotational inaccuracies, which complicate the measurement and machining processes, requiring extensive calibration and design efforts to minimize these errors.
Innovation Solution
Determining optimal working positions and orientations for the coordinate measuring instrument or processing tool relative to the turning device, where the expected error of the turning device is minimized, allowing for reduced measurement and design outlay by measuring and compensating for specific error sources, particularly translational and rotational errors, using calibration bodies and sensors to determine favorable positions and orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If errors of the turning device are minimized by using high-precision components (air bearings, direct drives), then measurement precision and manufacturing precision improve, but device complexity and design outlay increase
Solution Approach 1:
The patent changes the parameter of error characterization from generic positioning errors to specific periodic errors characterized by amplitude and frequency parameters. By modeling errors as periodic functions with specific parameters, the system achieves high measurement precision through parameter-based compensation rather than requiring ultra-precise mechanical components, thus avoiding increased device complexity.
Solution Approach 2:
The patent replaces mechanical error reduction (through air bearings and direct drives) with a computational error compensation system. Instead of relying solely on high-precision mechanical components, the system uses mathematical modeling and coordinate transformations to compensate for errors, substituting mechanical complexity with computational processing.
2Measurement precision
If full calibration of all six degrees of freedom is performed to minimize errors, then measurement precision improves, but loss of time and productivity decrease
Solution Approach 1:
The patent extracts and focuses only on the periodic error components from the full six-degree-of-freedom calibration process. By identifying and isolating the periodic error parameters (amplitude and frequency) that most significantly affect measurement precision, the system achieves high precision without requiring complete calibration of all calibration parameters, thus reducing calibration time.
Solution Approach 2:
The patent applies partial calibration by focusing only on the essential periodic error parameters rather than performing exhaustive calibration of all six degrees of freedom. This partial action on the most critical error sources achieves sufficient measurement precision while significantly reducing the time and resources required for complete calibration.
3Productivity
If measurement frequency is increased to improve productivity, then productivity improves, but measurement precision may deteriorate due to increased errors
Solution Approach 1:
The patent implements feedback through continuous error measurement and compensation during the measurement process. By measuring the periodic errors in real-time and applying compensation transformations, the system maintains high measurement precision even at increased measurement frequencies, thus improving productivity without sacrificing precision.
Solution Approach 2:
The patent performs preliminary error characterization and establishes error compensation models before actual measurement tasks. By pre-characterizing the periodic error parameters and preparing compensation transformations in advance, the system can quickly compensate for errors during high-speed measurements, enabling increased productivity while maintaining precision.
Data Source
AI summary
A method reduces errors in a turning device during a determination of coordinates of a work piece or during machining of the work piece. The turning device allows a rotational movement of the work piece about a rotation axis of the turning device. The method includes measuring errors in the turning device on account of deviations between actual positions and actual orientations of the rotation axis, on the one hand, and corresponding ideal positions and ideal orientations of the rotation axis, on the other hand, in a range of rotation angles. Expected error values of the turning device are determined from error measurements and are used to correct the turning device.