CHATTERBLOCK MONITORINGAVOIDING STRIP BREAKAGE THROUGH
CHATTER MONITORING
Increased throughput and rising demands on productquality push rolling mills to their limits – and sometimes
even further. This results in intensified stand vibrations,which impair product quality and in the worst caseseriously jeopardize the rolling process itself.
Continuous monitoring of the vibration level at each standof a cold rolling mill prevents strip breakage disasters.
Before chatter levels reach excessively high levels, theprocess control system must be alarmed.
ChatterBlock Monitoring reliably detects dangerous thirdoctave chatter of cold rolling mill stands before it becomes
audible. Line speed is then automatically reduced and therolling mill returns to safe operation. Furthermore, theChatterBlock Monitoring algorithms can detect fifth octave
chatter and roll defects (e.g. eccentricities, flat spots) ofwork and backup rolls.
FIELD OF APPLICATION
Cold rolling mills

FUNCTION
A vibration sensor at each roll stand continuously acquires
and transfers vibration signals via sensor interface anddata connection to the ChatterBlock Monitoring server.
At the same time, the server gets data like the spindles’
revolutions per minute and roll diameters from the processcontrol system (PCS). Based on these data, algorithms
generate several vibration levels per stand (third octavechatter, fifth octave chatter, roll defect) in real time. If thirdoctave chatter is detected, an alarm is immediately issued
to the PCS for a reduction in line speed until the level fallsback below the alarm threshold. The operator can thenincrease the strip speed again if desired.
BENEFITS• Prevents strip breakage caused by third octave chatter• Prevention of unplanned production stops• Increased product quality• Cost reduction through increased lifetime of production
equipment• Online monitoring and alarming at a reasonable priceWithout the support of a resonance vibration monitoring
system, the reaction time may be too long to prevent
damages to the strip or strip breakage. It is normally notpossible for the operator to identify and perform thenecessary corrective measures within such a short reaction
time.

primetals.com

Client overview screen

GUI with bar graphs and trending of vibration levels

PRODUCT FEATURES
Besides third octave, the system also detects fifth-octaveroll-chatter vibrations and possible roll defects such aseccentricities. In addition to real-time monitoring theChatterBlock Monitoring system also stores raw data andcan thus be used for condition monitoring in maintenance.
ChatterBlock Monitoring utilizes industrial grade, yetaffordable standard vibration sensors, proven signaltransformers and connection equipment and is suitable fora wide range of cold rolling mills.
The human machine interface provides online visualizationin the form of bar graph indicators and level trends as wellas line speed for quick stand status overview.

SERVICES• Mounting and installation of system (sensors,data acquisition units and ChatterBlock
Monitoring PC)• During start-up, basic parameterization iscarried out• After installation fine tuning can be provided.
We are also pleased to help you with youranalysis of rolling conditions and recommend
actions. We can best turn our competencies
and experience to account with a service
contract that is tailor-made for your business

TECHNICAL DATA
• Suitable for various mill stand configurations(e.g. 1-stand reversing, 5-stand tandem, …)

OTHER RELATED PRODUCTS• PC based solution• DMon• Server-client architecture• TorqueMon• Self monitoring hardware features• CMS• ChatterBlock Control• IEPE accelerometers• Up to 6 sensor inputs (expandable on request)• 4 k samples raw data acquisition rate
• Continuous measurements with vibration evaluation
update every 0.25 seconds• Configurable data archiving

Primetals Technologies
Austria GmbHA joint venture of Mitsubishi Heavy
Industries and partners
Turmstrasse 44 | 4031 Linz | Austria
primetals.com
Order No. T10-4-N119-L2-P-V2-EN
Printed in Linz | © 2020

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