阅读说明：本技术 热轧轧机辊系交叉程度表征方法 (Representation method for cross degree of roller system of hot rolling mill ) 是由 邱碧涛 袁金 周坤 徐浩 张俊 陈燕才 张中伟 徐在新 洪霞 于 2021-07-29 设计创作，主要内容包括：本发明提出一种热轧轧机辊系交叉程度表征方法,采用零调过程对轧机牌坊开档间隙进行监测,分次进行动态压下,通过线性拟合的方法得到轴承回油温度公式,计算工作状态下轧机支撑轴承的回油温度,进而得到轴承的横向膨胀量,然后进行间隙值对比,当发现轧机支撑辊的动态间隙不满足标准要求时,采取停机措施,重新调整间隙,本发明实现对轧机牌坊窗口间隙的合理控制,防止轧机支撑辊轴承因为温度膨胀、压力变形等导致的支撑辊轴承抱死。(The invention provides a method for representing the cross degree of a hot rolling mill roll system, which comprises the steps of monitoring the opening gap of a mill housing by adopting a zero adjustment process, dynamically pressing down in times, obtaining a bearing oil return temperature formula by a linear fitting method, calculating the oil return temperature of a mill support bearing in a working state, further obtaining the transverse expansion amount of the bearing, comparing gap values, and adopting a stopping measure to readjust the gap when the dynamic gap of the mill support roller is found not to meet the standard requirement.)

1. A representation method for the cross degree of a roll system of a hot rolling mill comprises an upper supporting roll, an upper working roll, a lower supporting roll and a lower working roll, wherein liners A are respectively arranged at an inlet and an outlet of the operation side of the upper supporting roll₁、A₂Lining plates B are respectively arranged at the inlet and the outlet of the operating side of the lower supporting roller₁、B₂Lining plates C are respectively arranged at the inlet and the outlet of the operation side of the upper working roll₁、C₂Lining plates D are respectively arranged at the inlet and the outlet of the operation side of the lower working roll₁、D₂The method is characterized by comprising the following steps:

s1) liner position measurement: the roller is installed in the window of the rolling mill housing through a bearing seat, and the upper working roller and the lower working roller are deviated to the outlet and are supported upwards due to the process settingThe supporting roller and the lower supporting roller deviate towards the inlet, so that the bearing seats of the upper working roller and the lower working roller respectively extrude the lining plate C during steel rolling₁、C₂、D₁、D₂The upper and lower supporting rollers extrude the lining board A₁、A₂、B₁、B₂Measuring the spatial position of each lining plate by a laser tracker;

s2) measuring the crossing angle between roller systems: fitting the central point a of each lining plate according to the spatial position of each lining plate₁、a₂、b₁、b₂、c₁、c₂、d₁、d₂Respectively connect with a₁、a₂；b₁、b₂；c₁、c₂；d₁、d₂Form four line segments a₁a₂、b₁b₂、c₁c₂、d₁d₂Line segment a₁a₂、b₁b₂The crossing angle of (A) is the crossing angle theta between the upper and lower support rollers₁Line segment a₁a₂、c₁c₂Is the intersection angle theta between the upper support roll and the upper work roll₂Line segment a₁a₂、d₁d₂The crossing angle of (A) is the crossing angle theta between the upper supporting roll and the lower working roll₃Line segment c₁c₂、d₁d₂The crossing angle of (A) is the crossing angle theta between the upper and lower working rolls₄Line segment c₁c₂、b₁b₂The crossing angle of (A) is the crossing angle theta between the upper working roll and the lower supporting roll₅Line segment d₁d₂、b₁b₂The crossing angle of the lower working roll is the crossing angle theta between the lower working roll and the lower supporting roll₆；

S3) determining a cross-stiffness formula: the cross stiffness k is obtained by fitting a sine function, and k is equal to e₁sinθ₁+e₂sinθ₂+e₃sinθ₃+e₄sinθ₄+e₅sinθ₅+e₆sinθ₆，e₁、e₂、e₃、e₄、e₅、e₆For fitting coefficient, under the condition of knowing the roll system crossing angle of the rolling mill, measuring and obtaining a corresponding rigidity value k according to the change condition of the rolling mill pressure and the roll gap_iEach new roll change measurement, a total of six measurements, k_i＝e₁sinθ_1i+e₂sinθ_2i+e₃sinθ_3i+e₄sinθ_4i+e₅sinθ_5i+e₆sinθ_6i，i＝[1,2,3,4,5,6]Using the six equations to obtain e₁、e₂、e₃、e₄、e₅、e₆And (4) obtaining the cross rigidity of the rolling mill according to the cross condition of the roll system.

2. The method of claim 1, wherein the cross stiffness formula in step S3 is simplified to k-e₁θ₁+e₂θ₂+e₃θ₃+e₄sinθ₄+e₅sinθ₅+e₆sinθ₆。

Technical Field

The invention belongs to the technical field of measurement and control of a hot rolling finishing mill, and particularly relates to a representation method of the crossing degree of a roll system of a hot rolling mill.

Background

For rolling mills, particularly hot rolling mills, the crossing degree of the roll systems has an important influence on the vertical rigidity of the rolling mills, the thickness control precision is particularly required to be high for the rolling of thin slabs, and higher requirements are put forward on the consistency of the rigidity of the rolling mills. For a hot rolling mill, the rigidity of a housing is not changed greatly, the main influence on the rigidity is the relative positions of a supporting roller and a working roller, and the influence degree of different positions on the rigidity of the rolling mill is calculated mainly by a finite element method at present. Firstly, the volume of the rolling mill is too large, the crossing degree of the rolling mill roll systems is usually very small, so that the simulation needs to reproduce the real working condition of the rolling mill on both a micro scale and a macro scale, and the simulation process is very complex. Therefore, a method is needed to be invented for qualitatively evaluating the crossing degree of the rolling mill roll system.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a representation method of the cross degree of a hot rolling mill roll system, the cross degree of the roll system of the hot rolling mill is qualitatively evaluated by utilizing the relative position of a lining plate of a mill housing window, the established index reflects the variation trend of the rigidity along with the cross angle, and the cross degree of the roll system can be quickly evaluated.

The technical scheme adopted by the invention for solving the technical problems is as follows: a representation method for the cross degree of a roll system of a hot rolling mill comprises an upper supporting roll, an upper working roll, a lower supporting roll and a lower working roll, wherein liners A are respectively arranged at an inlet and an outlet of the operation side of the upper supporting roll₁、A₂Lining plates B are respectively arranged at the inlet and the outlet of the operating side of the lower supporting roller₁、B₂Lining plates C are respectively arranged at the inlet and the outlet of the operation side of the upper working roll₁、C₂Lining plates D are respectively arranged at the inlet and the outlet of the operation side of the lower working roll₁、D₂The method is characterized by comprising the following steps:

s1) liner position measurement: the roller is installed in the window of the mill housing through the bearing seat, and due to the process setting, the upper working roller and the lower working roller deviate towards the outlet, the upper supporting roller and the lower supporting roller deviate towards the inlet, so that the bearing seats of the upper working roller and the lower working roller respectively extrude the lining plate C when rolling steel₁、C₂、D₁、D₂The upper and lower supporting rollers extrude the lining board A₁、A₂、B₁、B₂Measuring the spatial position of each lining plate by a laser tracker;

s2) measuring the crossing angle between roller systems: fitting the central point a of each lining plate according to the spatial position of each lining plate₁、a₂、b₁、b₂、c₁、c₂、d₁、d₂Respectively connect with a₁、a₂；b₁、b₂；c₁、c₂；d₁、d₂Form four line segments a₁a₂、b₁b₂、c₁c₂、d₁d₂Line segment a₁a₂、b₁b₂The crossing angle of (A) is the crossing angle theta between the upper and lower support rollers₁Line segment a₁a₂、c₁c₂Is the intersection angle theta between the upper support roll and the upper work roll₂Line segment a₁a₂、d₁d₂The crossing angle of (A) is the crossing angle theta between the upper supporting roll and the lower working roll₃Line segment c₁c₂、d₁d₂The crossing angle of (A) is the crossing angle theta between the upper and lower working rolls₄Line segment c₁c₂、b₁b₂The crossing angle of the upper working roll and the lower supporting roll is the crossing angle between the upper working roll and the lower supporting rollθ₅Line segment d₁d₂、b₁b₂The crossing angle of the lower working roll is the crossing angle theta between the lower working roll and the lower supporting roll₆；

S3) determining a cross-stiffness formula: the cross stiffness k is obtained by fitting a sine function, and k is equal to e₁sinθ₁+e₂sinθ₂+e₃sinθ₃+e₄sinθ₄+e₅sinθ₅+e₆sinθ₆，e₁、e₂、e₃、e₄、e₅、e₆For fitting coefficient, under the condition of knowing the roll system crossing angle of the rolling mill, measuring and obtaining a corresponding rigidity value k according to the change condition of the rolling mill pressure and the roll gap_iEach new roll change measurement, a total of six measurements, k_i＝e₁sinθ_1i+e₂sinθ_2i+e₃sinθ_3i+e₄sinθ_4i+e₅sinθ_5i+e₆sinθ_6i，i＝[1,2,3,4,5,6]Using the six equations to obtain e₁、e₂、e₃、e₄、e₅、e₆And (4) obtaining the cross rigidity of the rolling mill according to the cross condition of the roll system.

According to the above scheme, the cross stiffness formula in step S3 can be simplified to k-e₁θ₁+e₂θ₂+e₃θ₃+e₄sinθ₄

+e₅sinθ₅+e₆sinθ₆。

The invention has the beneficial effects that: the method for representing the cross degree of the roll system of the hot rolling mill is characterized in that a cross rigidity formula is obtained by fitting a sine function through the cross state of the roll system of the hot rolling mill, the influence of the cross state of the roll system of the hot rolling mill on the cross rigidity of the hot rolling mill can be effectively evaluated, the thickness precision control level of the hot rolling mill can be effectively improved by correcting the rigidity coefficient, and the method has popularization and application values.

Drawings

FIG. 1 is a side view of the spatial position of a mill roll train according to one embodiment of the present invention.

FIG. 2 is a top plan view of the spatial position of a mill roll train in accordance with one embodiment of the present invention.

Detailed Description

For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples.

The degree of crossing of the rolling mill roll systems has an important influence on the rolling mill thickness control accuracy, particularly when rolling thin plates, but quantitative characterization of the rolling mill stiffness is very difficult. The invention provides a method for reflecting the cross state of a rolling mill roll system by utilizing the opening position of a rolling mill housing window, the established characterization index can reflect the actual situation of the rigidity of the rolling mill relative to the cross change of the roll system, and the characterization index can be utilized to specifically guide field maintenance personnel to adjust the space position of the rolling mill roll system or participate in on-line process control.

As shown in FIG. 1, a steel strip 1 passes through a rolling mill by an upper work roll 2 having an upper support roll 4 and a lower work roll 3 having a lower support roll 5, and liners A are respectively disposed at an entrance and an exit of the upper support roll at an operation side thereof₁、A₂Lining plates B are respectively arranged at the inlet and the outlet of the operation side of the lower supporting roller₁、B₂Lining plates C are respectively arranged at the inlet and the outlet of the operation side of the upper working roll₁、C₂Lining plates D are respectively arranged at the inlet and the outlet of the operation side of the lower working roll₁、D₂。

As shown in figure 2, the roller is installed in the window of the rolling mill housing through the bearing seat, due to the process setting, the upper working roller and the lower working roller deviate towards the outlet, the upper supporting roller and the lower supporting roller deviate towards the inlet, so that the bearing seats of the upper working roller and the lower working roller respectively extrude the lining plate C when in steel rolling₁、C₂、D₁、D₂The upper and lower supporting rollers extrude the lining board A₁、A₂、B₁、B₂The spatial position of each lining plate is measured by a laser tracker.

Fitting the central point a of each lining plate according to the spatial position of each lining plate₁、a₂、b₁、b₂、c₁、c₂、d₁、d₂Respectively connect with a₁、a₂；b₁、b₂；c₁、c₂；d₁、d₂Form four line segments a₁a₂、b₁b₂、c₁c₂、d₁d₂Line segment a₁a₂、b₁b₂The crossing angle of (A) is the crossing angle theta between the upper and lower support rollers₁Line segment a₁a₂、c₁c₂Is the intersection angle theta between the upper support roll and the upper work roll₂Line segment a₁a₂、d₁d₂The crossing angle of (A) is the crossing angle theta between the upper supporting roll and the lower working roll₃Line segment c₁c₂、d₁d₂The crossing angle of (A) is the crossing angle theta between the upper and lower working rolls₄Line segment c₁c₂、b₁b₂The crossing angle of (A) is the crossing angle theta between the upper working roll and the lower supporting roll₅Line segment d₁d₂、b₁b₂The crossing angle of the lower working roll is the crossing angle theta between the lower working roll and the lower supporting roll₆。

The cross stiffness k is obtained by fitting a sine function, and k is equal to e₁sinθ₁+e₂sinθ₂+e₃sinθ₃+e₄sinθ₄+e₅sinθ₅+

e₆sinθ₆，e₁、e₂、e₃、e₄、e₅、e₆For fitting coefficient, under the condition of knowing the roll system crossing angle of the rolling mill, measuring and obtaining a corresponding rigidity value k according to the change condition of the rolling mill pressure and the roll gap_iEach new roll change measurement, a total of six measurements, k_i＝e₁sinθ_1i+e₂sinθ_2i+e₃sinθ_3i+e₄sinθ_4i+e₅sinθ_5i+e₆sinθ_6i，i＝[1,2,3,4,5,6]Using the six equations to obtain e₁、e₂、e₃、e₄、e₅、e₆And (4) obtaining the cross rigidity of the rolling mill according to the cross condition of the roll system.

Since the cross angle between the rolls is very small, the cross stiffness formula can be simplified to k ═ e₁θ₁+e₂θ₂+e₃θ₃+e₄sinθ₄+e₅sinθ₅+e₆sinθ₆。

In particular when theta₁、θ₂、θ₃、θ₄、θ₅、θ₆When the cross rigidity is zero, namely the rollers do not cross, the integral cross rigidity value is 0 and is consistent with the actual working condition, the cross rigidity is also the reason of fitting by a sine function, and meanwhile, the sine function is in a monotonous increasing property near 0 degree and also meets the production reality that the cross rigidity rises along with the cross angle.

The present invention is illustrated by the above examples, but is not limited to the embodiments of the present invention, and those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.