CN-117655120-B - Online automatic control method for roll gap deviation of finish rolling F1 frame

CN117655120BCN 117655120 BCN117655120 BCN 117655120BCN-117655120-B

Abstract

The invention relates to an online automatic control method for roll gap deviation of a finish rolling F1 frame, which comprises the following steps of detecting and collecting upper steel and relevant physical quantity of the steel, pre-adjusting the steel before finishing rolling, dynamically controlling finish rolling F7 after finishing threading F1, and automatically controlling finishing mill steel throwing stage after threading F7. The invention can realize the online automatic control of the roll gap deviation of the whole process F1, and improves the working efficiency.

Inventors

FU WENPENG
WANG YUGANG
XIE XIANGQUN
Tao Shaobin
HAN QIANLU

Assignees

上海梅山钢铁股份有限公司

Dates

Publication Date: 20260505
Application Date: 20220831

Claims (1)

1. The online automatic control method for the roll gap deviation of the finish rolling F1 frame is characterized by comprising the following steps of: step one, detecting and collecting relevant physical quantity of upper steel blocks and the steel blocks; Step two, pre-adjusting the steel before the steel is finely rolled into steel; step three, after the F1 threading is completed, the dynamic control is performed before the finish rolling F7 threading; step four, after threading F7, automatically controlling the finishing mill until the steel throwing stage; The method comprises the following steps of detecting and collecting the steel and the related physical quantity of the steel, wherein the step one is to detect and collect the steel and the related physical quantity of the steel, and the concrete steps are as follows: 1) The maximum value of the center offset of 10 meters of the head of the R2 last-pass intermediate billet of the steel block and the upper steel block 、 Positive values indicate the bias driving side and negative values indicate the bias working side in mm; 2) After the steel is bitten by the steel F1 and before the steel is bitten by the steel F2, the stress peak value F2SG max of the side guide plates on the two sides of the steel F2 is shown as positive value, the stress on the transmission side is shown as negative value, and the stress on the working side is shown as the unit KN; 3) The rolling force deviation variation amounts of the upper block steel F5-7 rolling mill at the two sides of the tail part after the steel is thrown on the upstream frame are respectively delta F5, delta F6 and delta F7, the unit KN is shown, the rolling force deviation of the two sides is=the rolling force of the transmission side-the rolling force of the working side, 4) Maximum value of 10 m center offset of tail part of strip steel at outlet of upper block steel finishing mill Positive values indicate the bias driving side and negative values indicate the bias working side in mm; step two, pre-adjusting the steel before the steel is finely rolled into steel, specifically comprising the following steps: before the steel is finely rolled into steel, the roll gap deviation of the F1 rolling mill is required to be pre-adjusted according to the condition of the incoming plate shape, the smooth threading process is ensured, the automatic pre-adjustment quantity of the roll gap deviation of the F1 due to the change of the incoming plate shape is defined as delta g1, a positive value indicates that the roll gap of the transmission side is increased, a negative value indicates that the roll gap of the transmission side is reduced, and the target width of the steel is W i , Wherein, delta g1 is the automatic preset adjustment quantity of F1 roll gap deviation due to the change of the incoming material plate shape, and delta g1 is less than or equal to 0.3mm; The maximum value of the center offset of 10 meters of the head of the intermediate billet in the last pass of the steel R2 is obtained; The maximum value of the center offset of 10 meters of the head of the intermediate billet in the last pass of the upper steel block R2 is given, and W i is the target width of the upper steel block; step three, after the F1 threading is completed, the dynamic control of the finish rolling F7 before threading is carried out is as follows: after the steel F1 is rolled out, the F1 roll gap deviation is required to be dynamically controlled according to the shape of the head part of the strip steel rolled out by the F1, the automatic adjustment quantity of the F1 roll gap deviation due to the shape of the head part of the strip steel rolled out by the F1 is defined as delta g2, positive values indicate that the roll gap of the transmission side is increased, negative values indicate that the roll gap of the transmission side is reduced, and then Wherein, delta g2 is the automatic adjustment quantity of the deviation of the roll gap of F1 due to the shape of the head part of the strip steel rolled by F1, delta g2 is less than or equal to 0.3mm, F2SG max is the stress peak value of the side guide plates at two sides of F2 after the steel F1 bites the steel and before the F2 bites the steel; and fourthly, after threading F7, automatically controlling the finishing mill until the steel throwing stage, wherein the method comprises the following steps of: After the threading of the steel F7 is completed, F1 roll gap deviation is required to be automatically controlled according to the shape of the tail part of the finish rolling of the upper steel, the automatic adjustment quantity of the F1 roll gap deviation due to the shape of the tail part of the finish rolling of the upper steel is defined to be delta g3, positive values indicate that the roll gap of the transmission side is increased, negative values indicate that the roll gap of the transmission side is reduced, and then The method comprises the steps of setting a rolling force deviation variable quantity of an upper block steel F5-7 rolling mill on two sides of the tail part after steel casting on an upstream frame, wherein Δg3 is an automatic adjustment quantity of the roll gap deviation of the upper block steel F1 due to the shape of the tail part of the upper block steel finish rolling, and I Δg3I is less than or equal to 0.5mm, wherein delta F5, delta F6 and delta F7 are respectively the rolling force deviation variable quantity of the upper block steel F5-7 rolling mill on two sides of the tail part after steel casting on the upstream frame, the rolling force deviation of two sides = driving side rolling force-working side rolling force, W i is the target width of the block steel, beta is a thickness correction coefficient, and beta is given as follows: when any one of the following conditions is satisfied, 1) When the absolute value of delta f5, delta f6 or delta f7 is smaller than 1000 KN; 2) the absolute value of (2) is less than 100mm; 3) Δf5, Δf6 Δf7 The symbols are different; 4) The signs of delta g1, delta g2 and delta g3 are the same; Δg3 is set to 0.

Description

Online automatic control method for roll gap deviation of finish rolling F1 frame Technical Field The invention relates to a control method, in particular to an online automatic control method for roll gap deviation of a finish rolling F1 frame, and belongs to the technical field of hot continuous rolling strip steel production control. Background The hot continuous rolling finishing mill frame generally comprises 6-7 frames (rolling mills), the roll gap deviation adjustment of the hot continuous rolling mill frame is mainly used for ensuring the strip steel threading, rolling and steel throwing processes of the finishing mill frame to be stable and smooth, the conventional hot continuous rolling is mainly manually adjusted at present, and although part of production lines are automatically leveled at the development tail part of the hot continuous rolling mill frame, the hot continuous rolling mill frame can only be used as an auxiliary means for the roll gap deviation adjustment of the rolling mill, and the automatic control requirement of the roll gap deviation of the finishing mill frame cannot be met. Along with the promotion of intelligent manufacturing work, how to realize the automatic control of hot continuous rolling frame roll gap deviation, replace original manual operation, be the most critical step of making hot continuous rolling line advance to full-automatic steel rolling. The method for pre-adjusting the roll gap deviation of the finishing mill frame according to the head sickle bending of the roughing incoming material is disclosed in the patent No. CN202110957974.9, but the method does not provide automatic control on the roll gap deviation according to the conditions of strip threading, rolling, steel casting and the like of the finishing mill frame, the patent No. CN201811554734.9 discloses a sickle bending control method for hot rolling intermediate billets, the parameters of rigidity difference of two sides of a rolling mill, rolling force deviation of two sides of an upper pass, center deviation of a plate blank of the upper pass and the like are comprehensively considered, the calculation process is complex, and the reciprocating rolling condition of the single frame of the roughing is not completely suitable for the condition of continuous rolling of a plurality of frames of the finishing mill. Aiming at the problems, the invention provides an online automatic control method for the roll gap deviation of a finish rolling F1 frame, which takes an F1 rolling mill as a whole part in the whole hot continuous rolling process, and comprehensively considers the conditions of the head camber change amplitude of the rough rolling feed of the block steel, the pressure of two sides of an outlet of the block steel F1 rolling mill, namely an F2 inlet side guide plate, the rolling force deviation of two sides of the tail of a frame of the upper block steel F5-7, the tail center offset of the outlet of the upper block steel F7 and the like through online automatic control of the roll gap deviation of the F1 rolling mill. The automatic control technology of the invention can replace the operation intervention of the roller gap deviation of the original finish rolling F1 frame. Disclosure of Invention The invention provides an online automatic control method for the roll gap deviation of a finish rolling F1 frame, which aims at the problems in the prior art, realizes online automatic control for the roll gap deviation of the finish rolling F1 frame and replaces the original manual operation. In order to achieve the above purpose, the technical scheme of the invention is as follows, an online automatic control method for roll gap deviation of a finish rolling F1 frame, the method comprises the following steps: step one, detecting and collecting relevant physical quantity of upper steel blocks and the steel blocks; Step two, pre-adjusting the steel before the steel is finely rolled into steel; step three, after the F1 threading is completed, the dynamic control is performed before the finish rolling F7 threading; and fourthly, after threading F7, automatically controlling the finishing mill until the steel throwing stage. The method comprises the following steps of detecting and collecting the steel and the related physical quantity of the steel, wherein the step one is to detect and collect the steel and the related physical quantity of the steel, and the concrete steps are as follows: the method comprises the steps of installing a width measuring instrument at an outlet of a rough rolling R2 rolling mill to detect the full-length center offset curve of an intermediate billet in the last pass of R2, installing pressure sensors at hydraulic cylinder loops at two sides of a guide plate at the inlet side of a finish rolling F2 rolling mill to detect the stress of the guide plates at two sides, installing the width measuring instrument at an outlet of a finish rolling F7 to detect the center offset cur