Method and device for monitoring chatter in twin drives of roll

Details Method and device for monitoring chatter in twin drives of roll Method and device for monitoring chatter in twin drives of roll

1994-07-08

1996-05-14

Williams, Hezron E.

Measuring and testing

Vibration

Sensing apparatus

73660, 722414, 72247, G01M 1300

Patent

active

055157319

ABSTRACT:
In chatter monitoring of twin drives of roll stands, vibrations of an upper drive and a lower drive are detected and monitored to determine whether a predetermined amplitude has been exceeded. If the amplitude has been exceeded, a chatter detection signal is generated. In order to prevent the chatter detection signal from being generated erroneously due to an operational pass vibrations, the frequencies of the vibrations of the upper drive and the lower drive are monitored for identity; when the frequencies are identical, the chatter detection signal is suppressed.

REFERENCES:
patent: 4537057 (1985-08-01), Kajiwara et al.
patent: 4843854 (1989-07-01), Ackerly
patent: 4989159 (1991-01-01), Liszka et al.
patent: 5058434 (1991-10-01), Zaschel
patent: 5109700 (1992-05-01), Hicho
Revue de Metallurgie, vol. 89, No. 6, Jun. 1992, Paris, France, pp. 571-577; Groothuizen et al.: Chatter detection in a five-stand cold mill.

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