CN-122007185-A - Process lubrication method of hot continuous rolling unit in rolling process

CN122007185ACN 122007185 ACN122007185 ACN 122007185ACN-122007185-A

Abstract

The invention belongs to the field of hot continuous rolling strip steel production technology, and in particular relates to a process lubrication method of a hot continuous rolling unit in the rolling process, which comprises the steps of determining the process lubrication oil proportion of each frame; the method comprises the steps of collecting head and tail signals of a flying shear and on-load signals of a rolling mill, manufacturing an oil-water mixture based on the proportion of process lubricating oil, spraying the oil-water mixture onto a supporting roller of the flying shear after the on-load signals of the flying shear are triggered, transferring the oil-water mixture onto a working roller in contact with the supporting roller by the rotating supporting roller, spraying the oil-water mixture onto the working roller of a frame after the on-load signals of the flying shear are triggered by the F2, the F3 and the F4 are delayed for a first preset time, spraying the oil-water mixture onto the working roller of the frame after the on-load signals of the flying shear are triggered by the F5 are delayed for a second preset time, closing a hot rolling oil valve when the tail signals of the flying shear are triggered, and closing an injection valve of the oil-water mixture after the tail signals are triggered by a third preset time. The invention eliminates the slip problem of saddle rolling mill.

Inventors

FU QINGCAI
AI CHENGSHEN
WANG GANG
LI JIANGWEI
WANG CUN
GAO YUBO
ZHAO GUODONG
SONG XIAOMING

Assignees

鞍钢股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260310

Claims (7)

1. A process lubrication method of a hot continuous rolling mill group in a rolling process, the hot continuous rolling mill group comprising a finishing mill group, the finishing mill group being configured with a primary control system and a secondary control system, the method comprising the steps of: the secondary control system determines the proportion of process lubricating oil of each rack according to the steel grade and the target thickness of the strip steel, and transmits the proportion of the process lubricating oil to the primary control system; The first-level control system collects head and tail cutting signals of the flying shears and loading signals of the rolling mill, and prepares an oil-water mixture based on the process lubricating oil proportion; After the on-load signal of the 1 st rolling mill F1 of the finishing mill group is triggered, spraying the oil-water mixture onto a supporting roller of the F1, and transmitting the oil-water mixture onto a working roller contacted with the rotating supporting roller; After the loading signals of the rolling mills F2, F3 and F4 of the 2 nd to 4 th frames of the finishing mill group are triggered, the oil-water mixture is sprayed onto the working rolls of the frame in a delayed first preset time; After triggering the on-load signal of the 5 th rolling mill F5 of the finishing mill group, delaying the second preset time to spray the oil-water mixture to F5; When the tail cutting signal of the flying shears is triggered, the hot rolling oil valve is closed, and after the tail cutting signal is triggered, the injection valve of the oil-water mixture is closed in a delayed third preset time.
2. The process lubrication method of a hot continuous rolling mill train in a rolling process according to claim 1, wherein the first preset time is 0 to 5 seconds, the second preset time is 1 to 5 seconds, and the third preset time is 8 to 12 seconds.
3. Process lubrication method in rolling process of hot continuous rolling mill train according to claim 1, characterized in that no lubrication is performed for the 6 th and 7 th rolling mills F6, F7 of the finishing mill train.
4. Process lubrication method in a rolling process of a hot continuous rolling mill train according to claim 1, characterized in that for the 6 th and 7 th rolling mills F6, F7 of the finishing mill train, the backup rolls or work rolls of the F6, F7 rolling mills are lubricated.
5. The process lubrication method for a hot continuous rolling mill train during rolling according to claim 1, wherein the oil-water mixture is sprayed onto the working or backup rolls of F5 for a second predetermined time.
6. The process lubrication method for the hot continuous rolling mill set in the rolling process according to claim 1, wherein the calculation formula of the process lubrication oil proportion is as follows: process oil ratio = base ratio coefficient x alloy composition correction coefficient x thickness correction coefficient x mill adjustment coefficient + correction coefficient.
7. The process lubrication method for the hot continuous rolling mill set in the rolling process, according to claim 6, is characterized in that the basic proportionality coefficient is determined by the surface quality requirement grade, the basic proportionality coefficient is 2% -7% when the common surface is required, the basic proportionality coefficient is 7% -12% when the higher surface is required, and the basic proportionality coefficient is 12% -30% when the highest surface is required; The alloy component correction coefficient is determined by manganese element components, and when the manganese element content is less than or equal to 0.3%, the proportion correction coefficient is 0.95-1.2, when the manganese element content is less than or equal to 0.3% < 0.5%, the proportion correction coefficient is 1-1.3, and when the manganese element content is greater than 0.5%, the proportion correction coefficient is 1.2-1.5; The thickness correction coefficient is determined by the target thickness of the strip steel, when the target thickness of the strip steel is less than or equal to 1.2mm and less than or equal to 2.5mm, the thickness correction coefficient is 1.2-1.5, the target thickness of the strip steel is less than or equal to 2.5mm, the thickness correction coefficient is 1-1.2, the target thickness of the strip steel is more than or equal to 4.5mm, and the corresponding thickness correction coefficient is 0.6-1; The rolling mill adjustment coefficients are set according to different frame serial numbers, the rolling mill adjustment coefficient corresponding to the F1 rolling mill is 0.95-1.05, the rolling mill adjustment coefficient corresponding to the F2-F4 rolling mill is 1-1.2, and the rolling mill adjustment coefficient corresponding to the F5 rolling mill is 1-1.1.

Description

Process lubrication method of hot continuous rolling unit in rolling process Technical Field The invention belongs to the field of hot continuous rolling strip steel production processes, and particularly relates to a process lubrication method of a hot continuous rolling unit in a rolling process. Background In the production of hot continuous rolled strip steel, finishing mill groups are often equipped with process lubrication techniques to reduce rolling forces, improve work roll surface quality and extend roll change cycles. The process lubrication technology sprays oil-water mixed liquid on the surface of the roller to form a lubrication film in the contact area of the roller and the strip steel, thereby reducing friction coefficient and optimizing the rolling process. The technology is mainly applied to working rolls, the effect of the technology is influenced by factors such as rolling speed, rolling force, lubricating fluid injection parameters and the like, and the lubricating strategy is required to be adjusted according to specific working conditions. At present, the application of the working roll process lubrication technology in a hot continuous rolling unit has significant limitations. For example, when the technology is applied to a first stand of a continuous rolling mill, the phenomenon of slipping between a roller and strip steel is easy to cause due to fluctuation of rolling force and unstable formation of a lubricating film, so that production is forced to be interrupted, and when the last stand is put into process lubrication, the problems of loop fluctuation and strip steel deviation possibly caused by uneven distribution of the lubricating film can influence production stability. In the prior art, static lubrication parameter setting or an empirical table method is relied on, and rolling conditions of different frames are difficult to dynamically adapt, so that the application range of process lubrication is limited, and particularly, rolling stability and lubrication effect cannot be considered when multiple frames are simultaneously put into the process. Disclosure of Invention According to the technical problems that the conventional hot continuous rolling process is unreasonable in lubrication control, slip of a saddle rolling mill, fluctuation of rolling force and poor quality of the roll surface and the surface of strip steel are easily caused, the process lubrication method of the hot continuous rolling unit in the rolling process is provided. According to the invention, the lubrication proportion of each stand is cooperatively set by using a primary control system and a secondary control system of the finishing mill group, and the F1 stand is indirectly lubricated through the supporting roller, F2-F4 delayed injection and F5 independent delayed injection, so that the slip problem of the saddle rolling mill can be completely eradicated, and the purposes of reducing the rolling force, improving the roll surface quality and the strip steel surface quality can be realized. The invention adopts the following technical means: a process lubrication method of a hot continuous rolling mill train in a rolling process, the hot continuous rolling mill train comprising a finishing mill train configured with a primary control system and a secondary control system, the method comprising the steps of: the secondary control system determines the proportion of process lubricating oil of each rack according to the steel grade and the target thickness of the strip steel, and transmits the proportion of the process lubricating oil to the primary control system; The first-level control system collects head and tail cutting signals of the flying shears and loading signals of the rolling mill, and prepares an oil-water mixture based on the process lubricating oil proportion; After the on-load signal of the 1 st rolling mill F1 of the finishing mill group is triggered, spraying the oil-water mixture onto a supporting roller of the F1, and transmitting the oil-water mixture onto a working roller contacted with the rotating supporting roller; After the loading signals of the rolling mills F2, F3 and F4 of the 2 nd to 4 th frames of the finishing mill group are triggered, the oil-water mixture is sprayed onto the working rolls of the frame in a delayed first preset time; After triggering the on-load signal of the 5 th rolling mill F5 of the finishing mill group, delaying the second preset time to spray the oil-water mixture to F5; When the tail cutting signal of the flying shears is triggered, the hot rolling oil valve is closed, and after the tail cutting signal is triggered, the injection valve of the oil-water mixture is closed in a delayed third preset time. Further, the first preset time is 0 to 5 seconds, the second preset time is 1 to 5 seconds, and the third preset time is 8 to 12 seconds. Further, the 6 th and 7 th rolling mills F6, F7 of the finishing mill group are not lubricated. Further, th