CN-122007178-A - Method and system for improving stability of tail of hot-rolled thin strip steel

CN122007178ACN 122007178 ACN122007178 ACN 122007178ACN-122007178-A

Abstract

The application belongs to the technical field of strip steel hot rolling, and relates to a method and a system for improving the stability of the tail of hot rolled thin strip steel. The method comprises the following steps of S1, step of controlling width of a side guide plate, S2, step of throwing steel and rapidly opening the side guide plate, S3, step of sequentially lifting a frame roll gap, S4, step of matching and rapidly opening the side guide plate, and S5, and step of protecting rolling force.

Inventors

SUN LIRONG
WEN XIONG
ZHONG JIANHUA
ZUO JIANQIANG
WAN JIAFENG
LI DA
SHI RUNTAO
Qu Huachen
WANG FENG
ZHANG JIQING
LI HE

Assignees

山东钢铁集团日照有限公司

Dates

Publication Date: 20260512
Application Date: 20260130

Claims (10)

1. The method for improving the stability of the tail of the hot rolled thin gauge strip steel is characterized by comprising the following steps: Step S1, a step of side guide width control, in which: The width allowance of each frame side guide plate of the finishing mill group in a rolling state is adjusted to be equal to a first preset value, so that the centering function of the side guide plates is improved, and the centering precision of rolled pieces is improved; Step S2, a step of throwing steel for a side guide plate and rapidly opening, wherein: detecting a steel throwing signal of the F3 rack, and controlling side guide plates of the F4 rack, the F5 rack and the F6 rack to be quickly opened to a second preset value; step S3, a step of sequentially lifting a frame roller gap, wherein: The F4 frame, the F5 frame, the F6 frame and the F7 frame of the finishing mill group are controlled to sequentially delay and lift the roll gap from the downstream to the upstream through manual triggering of keys; step S4, a step of matching and quick-opening a side guide plate, wherein: in the process of lifting the roller gaps of the frames, the side guide plates of the F5 frame, the F6 frame and the F7 frame are controlled to be opened rapidly according to a preset time sequence and a preset amplitude; Step S5, rolling force protection, wherein: In the process of lifting the roll gap of the stand, in order to ensure rolling stability, when the rolling force of the stand is reduced to be lower than a preset rolling force protection value, the roll gap lifting action of the stand is stopped.
2. The method according to claim 1, wherein the first preset value in the step S1 is 30mm.
3. The method according to claim 1, wherein the second preset value in the step S2 is 50mm.
4. The method for improving the tail stability of the hot rolled thin gauge strip according to claim 1, wherein the step S3 specifically comprises: when the tail plate shape cannot be regulated and controlled, clicking a button to start sequential lifting of the frame roll gap in order to avoid abnormal rolling; The F7 stand immediately starts to execute the roller lifting gap, the F6 stand starts to execute the roller lifting gap after delaying for a first time interval, the F5 stand starts to execute the roller lifting gap after delaying for a second time interval, and the F4 stand starts to execute the roller lifting gap after delaying for a third time interval.
5. The method according to claim 4, wherein the first time interval in the step S3 is 0.05 seconds, the second time interval is 0.1 seconds, and the third time interval is 0.15 seconds.
6. The method for improving the tail stability of the hot rolled thin gauge strip according to claim 1, wherein the step S4 specifically comprises: after the roll gap is lifted by the F5 machine frame, the side guide plate is opened according to a first preset amplitude after delaying for a fourth time interval, after the roll gap is lifted by the F6 machine frame, the side guide plate is opened according to a second preset amplitude after delaying for a fifth time interval, and after the roll gap is lifted by the F7 machine frame, the side guide plate is opened immediately according to a third preset amplitude.
7. The method according to claim 6, wherein the fourth time interval in the step S4 is 1 second and the fifth time interval is 0.45 seconds.
8. The method of claim 6, wherein the first predetermined width is 15mm, the second predetermined width is 25mm, and the third predetermined width is 50mm.
9. The method for improving the tail stability of hot rolled thin gauge strip steel according to claim 1, wherein in step S5, the preset rolling force protection value corresponding to each stand is: the preset rolling force protection value of the F4 stand is 11000KN, the preset rolling force protection value of the F5 stand is 9000KN, the preset rolling force protection value of the F6 stand is 70000 KN, and the preset rolling force protection value of the F7 stand is 4500KN.
10. A system for improving the tail stability of hot rolled thin gauge strip steel comprising: side guide width control module, in which: The width allowance of each frame side guide plate of the finishing mill group in a rolling state is adjusted to be equal to a first preset value, so that the centering function of the side guide plates is improved, and the centering precision of rolled pieces is improved; Side guide throws steel quick-opening module, in this module: detecting a steel throwing signal of the F3 rack, and controlling side guide plates of the F4 rack, the F5 rack and the F6 rack to be quickly opened to a second preset value; frame roll gap sequential lifting module, in this module: An operator is manually triggered by keys to control an F5 frame, an F6 frame and an F7 frame of the finishing mill group to sequentially delay and lift the roll gap from downstream to upstream; side guide cooperation quick-opening module, in this module: in the process of lifting the roller gaps of the frames, the side guide plates of the F5 frame, the F6 frame and the F7 frame are controlled to be opened rapidly according to a preset time sequence and a preset amplitude; a rolling force protection module, in which: In the process of lifting the roll gap of the stand, in order to ensure rolling stability, when the rolling force of the stand is reduced to be lower than a preset rolling force protection value, the roll gap lifting action of the stand is stopped.

Description

Method and system for improving stability of tail of hot-rolled thin strip steel Technical Field The invention belongs to the technical field of strip steel hot rolling, and particularly relates to a method and a system for improving the stability of the tail of hot-rolled thin strip steel. Background In the hot-rolling wide strip steel production line, the thin strip steel is a production key point due to high added value and large market demand of the product. However, when the product is produced, the deformation resistance of the tail part of the strip steel is sharply increased when the tail part enters a finish rolling area due to the fact that the design thickness of the intermediate blank is thinner and the obvious temperature drop occurs in the conveying process under the working condition that a hot rolling box is not arranged on a production line. The working condition can trigger a finish rolling automatic thickness control system (AGC) to press down a roll gap to maintain the outlet thickness, but the adjustment process is easy to cause stress unbalance of the tail part of the strip steel, severe deviation, folding and even tail flicking occur, and plate shape runaway and steel piling accidents are caused when severe, so that products are scrapped, the surface of a roll can be damaged, abnormal shutdown and roll replacement of a production line are forced, and the operation efficiency and cost control are seriously affected. At present, the conventional plate shape regulating means (such as regulating unilateral roll gap or roll bending force) is difficult to timely inhibit the tail plate shape mutation under the high-speed rolling state due to insufficient response speed and regulation precision. Therefore, how to realize rapid, cooperative and stable plate shape control in the tail-casting stage of the thin-specification strip steel becomes a technical problem to be solved in the field. In view of the foregoing, it is desirable to provide a method and system for improving the tail stability of hot rolled thin gauge strip to solve the above-mentioned drawbacks of the prior art. Disclosure of Invention The invention aims to provide a method and a system for improving the tail stability of hot-rolled thin strip steel, aiming at the defect that the tail shape mutation is difficult to be restrained in time in a high-speed rolling state due to insufficient response speed and adjustment precision in the prior art, so as to solve the technical problems. In order to achieve the above purpose, the present invention provides the following technical solutions: a method for improving the stability of the tail of hot rolled thin gauge strip steel comprises the following steps: Step S1, a step of side guide width control, in which: The width allowance of each frame side guide plate of the finishing mill group in a rolling state is adjusted to be equal to a first preset value, so that the centering function of the side guide plates is improved, and the centering precision of rolled pieces is improved; Step S2, a step of throwing steel for a side guide plate and rapidly opening, wherein: detecting a steel throwing signal of the F3 rack, and controlling side guide plates of the F5 rack, the F6 rack and the F7 rack to be quickly opened to a second preset value; step S3, a step of sequentially lifting a frame roller gap, wherein: An operator manually triggers the rolling mill group through keys to control the F4 frame, the F5 frame, the F6 frame and the F7 frame of the finishing mill group to sequentially delay and lift the roll gap from downstream to upstream; step S4, a step of matching and quick-opening a side guide plate, wherein: in the process of lifting the roller gaps of the frames, the side guide plates of the F5 frame, the F6 frame and the F7 frame are controlled to be opened rapidly according to a preset time sequence and a preset amplitude; Step S5, rolling force protection, wherein: In the process of lifting the roll gap of the stand, in order to ensure rolling stability, when the rolling force of the stand is reduced to be lower than a preset rolling force protection value, the roll gap lifting action of the stand is stopped. Preferably, the step S3 specifically includes: when an operator finds that the tail plate shape cannot be regulated and controlled, clicking a key to start sequential lifting of the frame roll gap in order to avoid abnormal rolling; The F7 stand immediately starts to execute the roller lifting gap, the F6 stand starts to execute the roller lifting gap after delaying for a first time interval, the F5 stand starts to execute the roller lifting gap after delaying for a second time interval, and the F4 stand starts to execute the roller lifting gap after delaying for a third time interval. The following technical effects can be achieved: By the sequence from the downstream stand to the upstream stand and the time difference of the roll gap lifting, the rolling force of the tail ar