Machine Tool Diagnostic Method Using Multi-Position Frequency Analysis
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Solution Overview
Problem
In machine tools, diagnosing abnormalities in a single feed axis can lead to inferior reliability due to changes in frequency characteristics when relative positions between multiple feed axes are altered.
Innovation Solution
A machine tool and diagnostic method that control first and second movable members to various attitude positions, acquiring and comparing frequency characteristics to determine abnormalities, improving reliability by considering changes in relative positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency characteristics are measured at a single feed axis, then the diagnostic process is simple, but the reliability of abnormality diagnosis deteriorates due to changes in relative positions between multiple feed axes
Solution Approach 1:
The patent segments the diagnostic process by measuring frequency characteristics at multiple discrete attitude positions of the movable member. Instead of a single measurement, the system divides the diagnostic approach into multiple measurement points (different attitude positions) to capture the full range of frequency characteristic variations, thereby improving diagnostic reliability while maintaining a systematic and manageable process
Solution Approach 2:
The patent adds a new dimension to the diagnostic process by incorporating attitude position as a variable. Frequency characteristics are no longer measured at a single point but across multiple attitude positions, transforming the diagnostic approach from one-dimensional (single measurement) to multi-dimensional (multiple measurements across different positions), which improves reliability without excessive complexity
2Measurement precision
If frequency characteristics are measured at multiple attitude positions, then the reliability of abnormality diagnosis is improved, but the measurement time and process complexity increase
Solution Approach 1:
The system performs preliminary actions by pre-establishing the relationship between attitude positions and frequency characteristics during normal operation. The control device stores frequency characteristics at various attitude positions in advance, so that during diagnostic measurement, the system can quickly retrieve and compare pre-stored data rather than performing exhaustive real-time measurements, thereby improving precision while reducing time loss
Data Source
AI summary
In a machine tool according to an embodiment of the present invention, a first motor and a second motor are controlled to drive a first movable part and a second movable part by a prescribed drive operation in each of a plurality of orientation positions. In the machine tool, a frequency characteristic of at least one of the first motor and the second motor is acquired that includes the times that the first movable part and the second movable part are positioned in each of the plurality of orientation positions, each of the frequency characteristics is compared with a corresponding standard frequency characteristic, and the presence of a malfunction in the machine tool is determined on the basis of the comparison result.