Machining Cycle Monitoring with Resampled Reference Comparison
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Solution Overview
Problem
Existing machining monitoring systems struggle to accurately detect operational abnormalities in cycle machining due to fluctuations in machining time, leading to inaccurate determination of normal operation, especially in large press machines where maintaining constant speed is challenging.
Innovation Solution
A machining step monitoring apparatus and method that includes a data segmentation unit to define machining start and end times, an oversampling filter to interpolate data, and a resampling unit to adjust data length to match reference data, enabling comparison with determination reference data to determine normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If machining time fluctuation is not corrected, then data comparison with reference is simple, but determination accuracy of normal operation deteriorates
Solution Approach 1:
The patent applies preliminary action by performing data length adjustment before comparison with reference data. The adjustment unit resamples the measured data to match the reference data length in advance, ensuring that fluctuations in machining time do not affect the accuracy of subsequent comparison operations. This preprocessing step enables accurate determination while maintaining a relatively simple overall system structure.
Solution Approach 2:
The patent changes the parameter of data length to resolve the contradiction. By dynamically adjusting the data length of measured values to match the reference data length through resampling, the system maintains high determination accuracy despite machining time fluctuations. This parameter transformation allows accurate comparison without requiring complex synchronization mechanisms.
2Measurement precision
If data length is adjusted to match reference data, then determination accuracy improves, but data throughput increases
Solution Approach 1:
The patent applies partial action by performing data length adjustment only on the necessary portions of the measured data. The adjustment unit selectively resamples data points to match the reference length, processing only what is needed for accurate comparison rather than handling entire datasets excessively. This approach maintains high determination accuracy while minimizing the overall data throughput burden.
3Measurement precision
If data length adjustment is performed, then comparison accuracy with reference data improves, but processing time increases
Solution Approach 1:
The patent performs data length adjustment as a preliminary step before comparison operations. By resampling the measured data to match reference data length in advance, the system ensures high comparison accuracy while organizing data for efficient subsequent processing. This preliminary organization reduces the time required for actual comparison operations.
Solution Approach 2:
The patent transforms the data length parameter to enable accurate comparison. By changing the measured data length to match the reference data length through resampling, the system achieves high comparison accuracy. The parameter transformation is performed efficiently to minimize the time added to the overall processing cycle.
Data Source
AI summary
A machining step monitoring apparatus includes a data segmentation unit, a data length adjuster, and a determination processor. The data segmentation unit defines machining start time and machining end time of each single cycle, and segments, from a first physical quantity that temporally changes during the cycle machining in the machining machine, first measurement data indicating the first physical quantity from the machining start time to the machining end time for each single cycle. The data length adjuster generates the second measurement data by adjusting the data length of the first measurement data to match with the data length of the determination reference data indicating, as a reference, a change in the first physical quantity during the single cycle when the machining machine is normally operating. The determination processor compares the second measurement data with the determination reference data to determine whether the machining machine is normally operating.