Strip steel speed value taking control method for finishing mill group after roll replacing

Abstract

The invention belongs to the field of hot continuous rolling strip steel rolling line control and particularly relates to a strip steel speed value taking control method for a finishing mill group after roll replacing. The method includes that after a roll of the finishing mill group is replaced, strip steel speed is changed from climbing speed to rolling speed of a head machine frame of a strip steel block, the strip steel block speed is remained before the head machine frame is rolled, a control time sequence of a descaling area device is equal to the value obtained in the way that an action distance of the descaling area device divides corresponding device strip steel speed, and the action distance of the descaling area device is designed as the distance between a hot metal detector HMD62 after fly shearing and the descaling device. By means of the strip steel speed value taking control method, an accurate tracking time sequence between a finishing mill descaling pinch roll and descaling water is guaranteed, and insulation value of a side heater roll table is guaranteed.

Description

technical field [0001] The invention belongs to the field of hot continuous rolling strip steel rolling line control, in particular to the value control of strip steel speed after roll changing in a finish rolling mill. Background technique [0002] In order to ensure the surface quality of stainless steel, the input rate of edge heaters is also required to be higher and higher when rolling stainless steel. The speed of the first stand of the finishing mill is usually a creeping fixed value when the car is transferred after the roll change, and the speed of the descaling area at the entrance of the finishing mill is changed from creeping speed to rolling speed after strip cutting. The descaling area is a variable speed area, resulting in inaccurate timing calculation of the descaling water and descaling pinch roller landing control, resulting in the inability of the descaling pinch roll to seal the finishing descaling water, and the finishing descaling water is often sprayed...

AI Technical Summary

Problems solved by technology

The descaling area is a variable speed area, resulting in inaccurate timing calculation of the descaling water and descaling pinch roller landing control, resulting in the inability of the descaling pinch roll to seal the finishing descaling water, and the finishing descaling water is often sprayed On the roller table of the edge heater, it affects the insulation value of the roller table of the edge heater, so that the edge heater cannot be put into use normally, and seriously affects the surface quality of nickel-based, chromium-based and other stainless steels