| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.24 ( April 1991 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Development of Diagnosis Techniques for Hot Strip Mills Kiyoshi Takagi, Hisao Hotta, Masanori Watanuki, Noriaki Inoue, Toshihiro Hanada, Akihiko Matsumura |
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Synopsis : Kawasaki Steel Corp. has developed the diagnostic techniques for the purpose of the failure prediction and performance assurance of device in hot strip mill of Chiba and Mizushima Works. Main diagnostic techniques are (1) performance diagnosis and diagnosis of bearing by AE method with sizing press, which predicts the irregular movement caused by the slow response of control system and the increase of mechanical friction, (2) diagnosis of mill spring's abnormality which observes the difference of mill spring occurred by the low stiffness of screw down device with high-crown mill, and (3) performance diagnosis and alignment diagnosis of AJC which makes a diagnosis of the response time accuracy and the jumping height accuracy with AJC coiler. Since these diagnostic techniques were applied, they have contributed to the prevention of miss rolling, inferior goods and downtime by the slow response of control system and the bad accuracy of equipment. |
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