| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.41 ( October 1999 ) Advances in Iron and Steel Technologies, Commemorating the 30th Anniversary of Technical Research Laboratories ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Recent Activities in Research of Measurement
and Control Akira Torao, Kazuya Asano, Hajime Takada |
| Synopsis: On-line measurement and process control have recently become increasingly important to keep stable and effective production of high quality and homogeneous products. To satisfy these strong needs, optical or ultrasonic measuring instruments and control systems using advanced control theories have been developed and applied to actual steel production processes. In this paper, research activities performed at the Mechanical Processing, Instrumentation and Control Laboratory in the last ten years are described. Representative examples shown here are as follows: (1) Optical measurement: (a) Surface roughness measurement for cold rolled steel strips, (b) Glossiness and whiteness measurement for cold rolled stainless steel strips, (c) Oil film thickness measurement for cold rolled steel strips by using a laser fluorescence method, (2) Ultrasonic measurement: (a) Nondestructive orientation measurement for secondary recrystallized grains in the grain-oriented electrical steel by ultrasonic interferometry, (b) Immersion testing method for the detection of nonmetallic inclusions, (3) Dimension/position measurement: (a) Work roll profile meter for the rolling mills, (b) Detecting system of joints in endless hot rolled strips, (4) Control technology: (a) Molten steel level control for continuous casting, (b) Decentralized tension-looper control for hot strip mills. |
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