Cold Rolling Mill Chattering Detection for Rapid Vibration Growth

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Solution Overview

Problem

Existing methods for detecting chattering in cold rolling mills, such as those described in Patent Literature 1 and 2, face challenges in precisely determining the dangerous zone for chattering and cannot handle sudden changes in conditions, while the method in Patent Literature 3 is ineffective in capturing rapidly growing chattering signs and preventing breakage.

Innovation Solution

A chattering detection method that measures vibrations, performs frequency analysis for a period of 0.5 seconds or less to calculate a time waveform of vibration intensity, and detects chattering sign vibrations by identifying points exceeding a threshold, with the option to reduce rolling speed when chattering is detected.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If frequency analysis is performed for a long period to accurately detect chattering, then measurement precision is improved, but response time to rapidly growing chattering deteriorates

Engineering Contradiction:

Improvechattering detection accuracyVSAvoidresponse time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The system performs frequency analysis on vibration signals with a predetermined period of 0.5 seconds or less to calculate time waveform of vibration intensity in advance. This preliminary calculation allows the system to detect chattering signs before they develop into severe chattering, enabling timely response while maintaining detection accuracy.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent dynamically adjusts the analysis period to 0.5 seconds or less specifically for detecting rapidly growing chattering signs. This dynamic parameter adjustment optimizes the balance between measurement precision and response time, allowing the system to adapt to different chattering development stages.

Inventive Principle:

Principle #15Dynamics

2Reliability

If rolling speed is reduced to avoid chattering occurrence, then reliability is improved, but productivity deteriorates

Engineering Contradiction:

Improvechattering preventionVSAvoidrolling capacity

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The system continuously monitors vibration signals and provides feedback on chattering signs. Based on this real-time feedback, the control device can make informed decisions about speed adjustment, reducing speed only when necessary to prevent chattering while maintaining high speed during normal operation, thus optimizing both reliability and productivity.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

By detecting chattering signs in advance through frequency analysis with 0.5 second or less period, the system can take preliminary speed reduction actions before severe chattering occurs. This prevents catastrophic failures while minimizing speed reductions, thereby maintaining high productivity during safe operating conditions.

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If existing detection methods are used to identify chattering dangerous zones, then device complexity is reduced, but measurement precision deteriorates

Engineering Contradiction:

Improvedetection system simplicityVSAvoidchattering detection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent replaces complex mechanical detection methods with frequency analysis of vibration signals. By using signal processing techniques to analyze vibration characteristics and calculate time waveform of vibration intensity, the system achieves precise chattering detection without requiring complex mechanical detection devices.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system performs frequency analysis with a specific predetermined period of 0.5 seconds or less, which is sufficient to detect rapidly growing chattering signs. This partial action approach focuses computational resources on the critical detection window, achieving high measurement precision without requiring excessively complex or continuous analysis.

Inventive Principle:

Principle #16Partial or excessive action

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

Effectively detects chattering sign vibrations, preventing occurrences of trouble like breakage by accurately identifying and responding to chattering before it becomes severe.

Implementation Method 1

a measuring step of measuring a vibration of a cold rolling mill

Methodology Applied

Scientific EffectVibration: Vibration

Implementation Method 2

a calculating step of calculating a time waveform of vibration intensity by performing frequency analysis on a time waveform of the vibration measured at the measuring step

Methodology Applied

Scientific EffectFrequency analysis:

Data Source

PatentUS11779978B2Chattering detection method for cold rolling mill, chattering detection device for cold rolling mill, cold rolling method, and cold rolling mill

Publication Date: 2023.10.10 JFE STEEL CORP

AI summary

A chattering detection method for a cold rolling mill, the method including: measuring a vibration of a cold rolling mill; calculating a time waveform of vibration intensity by performing frequency analysis on a time waveform of the measured vibration of the cold rolling mill for a predetermined period equal to or shorter than a time in which a periodic vibration continues without converging; and detecting a chattering sign vibration of the cold rolling mill based on a number of points having vibration intensity values that exceed a predetermined threshold, the points being included in the calculated time waveform of the vibration intensity.