Coordinate Measuring Machine Error Determination via Motion Simulation
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Solution Overview
Problem
Existing methods for determining the reliability of coordinate measuring machines based on motion errors do not accurately differentiate between motion errors and measurement errors, leading to inappropriate assessments of machine quality.
Innovation Solution
An error determination apparatus and method that acquires motion error information and design information of a workpiece, specifies measurement positions, and determines measurement errors occurring due to motion errors, allowing for accurate assessment of measurement errors and machine reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motion error is used as an indicator to check the coordinate measuring machine, then the machine can be checked for quality, but the determination of machine quality becomes inaccurate because motion error differs from measurement error
Solution Approach 1:
The patent introduces a simulation model as an intermediary between motion error measurement and actual measurement error determination. The simulation model takes motion error data and workpiece design information as inputs, then calculates the expected measurement error through virtual measurement simulation. This intermediary model allows accurate prediction of measurement error without requiring direct measurement error measurement, resolving the contradiction between reliability assessment and measurement precision.
Solution Approach 2:
The patent creates a virtual copy of the measurement process through simulation. Instead of directly measuring measurement error, the system simulates the entire measurement process using motion error data and workpiece geometry, producing a virtual measurement result that replicates actual measurement conditions. This copying approach enables accurate error determination while avoiding the complexity of direct measurement error measurement.
2Productivity
If motion error measurement is performed, then the coordinate measuring machine can be evaluated, but the evaluation does not accurately reflect actual workpiece measurement quality
Solution Approach 1:
The patent performs preliminary simulation of the measurement process before actual measurement occurs. By pre-calculating the expected measurement error using motion error data and workpiece design information, the system prepares evaluation results in advance. This preliminary action allows efficient machine evaluation while ensuring accuracy, as the simulation accounts for all factors affecting measurement error including workpiece geometry and measurement positions.
Data Source
AI summary
An error determination apparatus for determining a measurement error that occurs when a workpiece is measured by a coordinate measuring machine, the error determination apparatus includes an information acquisition part that acquires a) motion error information indicating a result of measuring a motion error of the coordinate measuring machine and b) design information of the workpiece, a measurement position specification part that specifies a measurement position on the workpiece on the basis of the design information, an error determination part that determines a measurement error occurring in the measurement at the measurement position due to the motion error on the basis of the motion error information, and an output part that outputs the measurement error determined by the error determination part.