| 摘要 |
PURPOSE:To improve the sheet thickness fluctuation owing to the eccentricity of the backup roll, by operating the comparison beween the output of resultant operation for the detecting signal of the rolling speed of the work roll and the signal of the function generator, etc., and the feed pressure of the lubricant oil, and by adjusting the feed pressure of the lubricant oil. CONSTITUTION:The output signal of the function generator 5 receiving the output signal of the work roll's rolling speed detector 4, and the output signal of the function generator 9 receiving the output signal of the rolling pressure detector 7 through the filter 8, are operated by the resultant operator 6. The output of this resultant operation is digital-to-analog converted by D/A converter 10 and its output is taken as the set value of the feed pressure of the lubricant oil. This value is compared with the lubricant oil's feed pressure being fed to the backup roll 3, by the pressure comparison operator 11. According to this output, the proportional electromagnetic valve 25 installed in the bye-pass pipe 27 is controlled, and the oil pressure to be fed to the super high pressure pump 23 is adjusted. Hereby, the thickness of the oil film of the backup roll's bearing 3a becomes contant independently of the fluctuation of the rolling speed and rolling pressure, and the acuracy of sheet thickness is improved. |
