CN102189111A - A roll gap lubrication method for producing ultra-thin hot-rolled strip steel by semi-endless rolling technology - Google Patents

Abstract

The invention discloses a roll gap lubricating method for producing ultrathin hot rolled strip steel by using a semi-endless rolling technology, wherein the opening degree of an electromagnetic control valve is controlled, the amount of lubricating oil flowing through an oil supply pipe and entering an oil-water mixer is 50-100 ml/min, the opening degree of a water quantity regulating control valve is controlled, the flow rate of circulating water flowing through a water supply pipe and entering the oil-water mixer is 40-60L/min, and oil-water mixtures in the oil-water mixer are respectively sprayed to the roll surfaces of an upper working roll and a lower working roll through nozzles on a spray header pipe. The first rolling mill and the seventh rolling mill do not lubricate in the hot rolling process of the strip steel, and the head and the tail of the strip steel are not lubricated. When the head of the strip steel reaches the next rolling mill, the electromagnetic control valve on the previous rolling mill is opened, when the tail of the strip steel reaches the final stand, all the electromagnetic control valves are closed, and meanwhile, the cooling water of the working rolls on the inlet sides of the second rolling mill to the sixth rolling mill is closed. The roll gap lubricating method can reduce the abrasion of the roll, relieve the vibration of the rolling mill, ensure the stability of the rolling process and improve the strip shape quality of the strip steel.

Description

A roll gap lubrication method for producing ultra-thin hot-rolled strip steel by semi-endless rolling technology

technical field

The invention relates to a roll gap lubrication method for producing ultra-thin hot-rolled strip steel with a thickness of h≤1.2mm by semi-endless rolling technology on a thin slab continuous casting and rolling production line, belonging to the field of hot-rolled strip steel rolling lubrication.

Background technique

With the upgrading of product structure, the obvious increase in market demand for ultra-thin strips, and the strong requirements for reducing procedures, reducing costs and energy consumption, the hot-rolled ultra-thin strip products that "replace heat with heat" have attracted much attention. .

The traditional rolling process still has certain difficulties in producing ultra-thin hot-rolled strip steel (thickness ≤ 1.2mm), while the advanced semi-endless rolling technology has obvious advantages in producing ultra-thin products; The manufacturing process (technology) is to use a conventional rolling continuous casting slab with a length of 2 to 7 times. When rolling an ultra-thin strip steel with such a long continuous casting slab, the contact time between the product (strip steel) and the roll is significantly increased. , will have a significant impact on roll wear, thermal crown and shape quality. In order to reduce this adverse effect, roll gap lubrication technology must be used.

Before the present invention, when adopting semi-endless rolling technology (technique) to produce strip on continuous casting and rolling production line (i.e. CSP production line), the technology that realizes lubricating work roll gap is also very little, especially for ultra-thin heat The roll gap lubrication technology for rolled strip steel (thickness h≤1.2mm) has not been reported, mainly because the tension between the stands is easy to fluctuate when producing ultra-thin hot rolled strip steel, and it will be transmitted to the connected stands. It will cause system vibration, cause the dimensional accuracy of the strip to exceed seriously, and even cause broken strips and damage equipment. Therefore, ensuring the stability of the ultra-thin hot-rolled strip under the condition of roll gap lubrication is the key to the control of the roll gap lubrication process.

At present, the lubricating device used in the thin slab continuous casting and rolling production line in China is ZL200810031458.8 "lubricating device for hot-rolled strip rolling process". Control the oil volume and the opening and closing of the oil circuit. The pressure reducing valve and the water volume adjustment control valve respectively control the water pressure and flow of the circulating water. After the oil and water are mixed in the oil-water mixer, they are sprayed to the upper, The roll surface of the lower work roll is lubricated.

There is an application number of 200610124130.1 "A Method for Lubrication of Hot Rolling Process", which uses continuous casting with a thickness of 50-60 mm, a width of 1000-1350 mm and a furnace temperature of 1050-1180 ° C on the thin slab continuous casting and rolling production line. The billet is used to produce strip steel with a finished thickness of 1.2-12.7mm. During the production of hot-rolled strip steel with this thickness, the oil-water mixture is sprayed on the roll surface of the backup roll and the work roll to realize the lubrication of the hot rolling process. However, there is no mention of the issue of roll gap lubrication in the production of ultra-thin strip steel (h≤1.2mm) using semi-endless rolling technology (process).

Contents of the invention

The purpose of the present invention is to provide a semi-endless rolling technology to produce ultra-thin (h ≤1.2mm) hot-rolled strip roll gap lubrication method.

In order to accomplish the above object, the technical solution adopted by the present invention is: connect the oil supply pump to the rear end of the fuel tank, the outlet end of the oil supply pump is connected with the first oil supply metering pump and the second oil supply metering pump, and connect the first oil supply pipe Connect between the first oil supply metering pump and the first electromagnetic control valve, connect the second oil supply pipe between the second oil supply metering pump and the second electromagnetic control valve, the first electromagnetic control valve and the second electromagnetic control valve The outlet ports of the valve are respectively connected with the inlet ports of the first oil-water mixer and the second oil-water mixer. The first water supply pipe connected to the pressure reducing valve is connected to the inlet port of the first oil-water mixer after passing through the first water supply switch and the first water volume adjustment control valve, and the second water supply pipe connected to the pressure reducing valve passes through the second water supply switch and the second water supply pipe. The water volume adjustment control valve is connected with the inlet end of the second oil-water mixer afterward. The first oil-water mixer is connected to the first spray header through a hose, and the second oil-water mixer is connected to the second spray header through a hose. Above the upper water cutting plate next to the work roll, the nozzles installed on the second spray header, the number of which is greater than or equal to 1, is located under the lower water cutting plate next to the lower work roll, and the upper cooling water header is located next to the upper work roll. Between the first spray header and the upper water cutting plate, the lower cooling water header is located between the second spray header next to the lower work roll and the lower water cutting plate. Control the opening of the first electromagnetic control valve and the second electromagnetic control valve so that the lubricating oil flow into the first oil-water mixer and the second oil-water mixer through the first oil supply pipe and the second oil supply pipe is 50~ 100ml/min, control the opening of the first water volume adjustment control valve and the second water volume adjustment control valve, so that the circulating water flow into the first oil-water mixer and the second oil-water mixer after passing through the first water supply pipe and the second water supply pipe It is 40~60l/min. Spray the oil-water mixture in the first oil-water mixer to the roll surface of the upper work roll through the nozzle on the first spray header, and spray the oil-water mixture in the second oil-water mixer to the roller surface through the nozzle on the second spray header The roll surface of the lower work roll.

During the hot rolling process of the strip steel, the roll gap between the upper work roll and the lower work roll of the first stand and the seventh stand of the finishing tandem rolling mill is not lubricated.

The head and tail of the strip are not lubricated.

In the hot rolling process of the strip, when the head of the strip reaches the stand of the next rolling mill, the first electromagnetic control valve and the second electromagnetic control valve on the previous rolling mill are opened, and when the tail of the strip reaches Close the first electromagnetic control valve and the second electromagnetic control valve from the second rolling mill to the sixth rolling mill during the seventh rolling mill stand.

During the hot rolling process of the strip, the cooling water on the upper cooling water header and the lower cooling water header on the inlet side from the second rolling mill to the sixth rolling mill is closed.

Compared with the prior art, the roll gap lubrication method of producing ultra-thin hot-rolled strip steel with semi-endless rolling technology provided by the above technical scheme has the following technical effects:

① The roll gap lubrication method does not aim to reduce the rolling force of the rolling mill, but mainly controls the quality of the circulating water, lubricating oil, oil-water ratio, opening sequence of the oil-water mixture injection valve and the uniformity of the oil film injection. The reduction in rolling force ensures the stability of rolling ultra-thin hot-rolled strip steel;

②Reduce the wear of the roll and increase the service life of the roll by 3 to 5 times;

③ Make the center thickness difference of the strip along the length direction between 20 and 40 μm;

④ Ensure that the crown of the strip steel is between 20 and 30 μm.

Description of drawings

Fig. 1 is a schematic diagram of the technological layout of a roll gap lubrication method for producing ultra-thin hot-rolled strip steel by semi-endless rolling technology according to the present invention, and is also an abstract accompanying drawing of the present invention.

Fig. 2 is a schematic layout diagram of each rack of the finishing tandem rolling mill.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples.

As shown in Figure 1, a kind of roll gap lubrication method that produces ultra-thin hot-rolled strip steel with semi-endless rolling technology of the present invention is realized by lubricating device, and it comprises (lubricating) oil tank 1, oil supply pump 2. The first oil supply metering pump 3 and the second oil supply metering pump 3A, the first oil-water mixer 4 and the second oil-water mixer 4A, the first electromagnetic control valve 5 and the second electromagnetic control valve 5A, the first water volume adjustment Control valve 6 and second water volume adjustment control valve 6A, first spray header 7 and second spray header 7A, upper cooling water header 8 and lower cooling water header 8A, upper water cutting plate 9 and lower water cutting Plate 9A, first water supply switch 12 and second water supply switch 12A, first water supply pipe 13 and second water supply pipe 13A, first oil supply pipe 14 and second oil supply pipe 14A, and pressure reducing valve 15, in which the upper work roll 10 and the lower work roll 10A can be designated as the first rolling mill F1, the second rolling mill F2, the third rolling mill F3, the fourth rolling mill F4, the fifth rolling mill The upper work roll and the lower work roll of the rolling mill F5, the sixth rolling mill F6 and the seventh rolling mill F7, as far as the present invention is concerned (as shown in Figure 2), since the first rolling mill F1 and the seventh rolling mill F7 are not used The roll gap lubrication process is only applied to the upper work roll 10 and the lower work roll of the second stand F2, the third stand F3, the fourth stand F4, the fifth stand F5 and the sixth stand F6 of the finishing tandem rolling mill Install roll gap lubrication device next to 10A.

Connect the oil supply pump 2 to the rear end of the oil tank 1, the outlet end of the oil supply pump 2 is connected with the first oil supply metering pump 3 and the second oil supply metering pump 3A, the first oil supply metering pump 3 passes through the first oil supply pipe 14 It is connected with the first electromagnetic control valve 5, and the second oil supply metering pump 3A is connected with the second electromagnetic control valve 5A through the second oil supply pipe 14A. The outlet ports of the first electromagnetic control valve 5 and the second electromagnetic control valve 5A are respectively the same as The inlet ends of the first oil-water mixer 4 and the second oil-water mixer 4A are connected. The first water supply pipe 13 connected to the decompression valve 15 is connected to the inlet end of the first oil-water mixer 4 after passing through the first water supply switch 12 and the first water volume adjustment control valve 6, and the second water supply pipe 13A connected to the decompression valve 15 is passed through The second water supply switch 12A and the second water volume regulating control valve 6A are connected to the inlet port of the second oil-water mixer 4A. The lubricating oil that comes from the first oil supply pipe 14 mixes with the circulating water that comes from the first water supply pipe 13 and then enters the first oil-water mixer 4, and the lubricating oil that comes from the second oil supply pipe 14A comes with the second water supply pipe 13A. After the circulating water is mixed, it enters the second oil-water mixer 4A.

The oil properties of the lubricating oil provided by the oil tank 1 through the oil supply pump 2 are very important for the effect of roll gap lubrication, so that the oil-water mixture after mixing the lubricating oil and circulating water must have a certain viscosity.

Control the opening of the first electromagnetic control valve 5 and the second electromagnetic control valve 5A, so that the oil entering the first oil-water mixer 4 and the second oil-water mixer 4A after passing through the first oil supply pipe 14 and the second oil supply pipe 14A The lubricating oil flow rate is 50-100ml/min, and the openings of the first water volume adjustment control valve 6 and the second water volume adjustment control valve 6A are well controlled so that the oil and water flow into the first water supply pipe 13 and the second water supply pipe 13A. The circulating water volume of the mixer 4 and the second oil-water mixer 4A is 40-60 l/min.

The oil-water mixture from the first oil-water mixer 4 enters the first spray header 7 through the hose, and the number of nozzles greater than or equal to 1 is installed on the first spray header 7 opposite to the upper work roll 10; The oil-water mixture from the mixer 4A enters the second spray header 7A through the hose, and the second spray header 7A opposite to the lower work roll 10A is equipped with a number of nozzles greater than or equal to 1. Use multiple nozzles on the first spray header 7 to spray the oil-water mixture in the first oil-water mixer 4 to the roll face of the upper work roll 10 to carry out roll gap lubrication on the upper work roll 10, and use the second spray header A plurality of nozzles on 7A spray the oil-water mixture in the second oil-water mixer 4A to the roll surface of the lower work roll 10A to lubricate the roll gap of the lower work roll 10A. The nozzles on the first spray header 7 and the second spray header 7A are selected from the FUIFIX-660.674.17 nozzles of Lechler (Lechler) with large openings, which can increase the amount of water used for lubricating the roll gap. The spraying angle of the oil-water mixture, the distance between the nozzles and the distance from the nozzles to the surface of the upper work roll 10 and the lower work roll 10A should ensure that there is no discontinuity and overlap between the spraying intervals of the nozzles. In addition, the head and the tail of the steel strip 11 are not lubricated, so the first electromagnetic control valve 5 and the second electromagnetic control valve 5A on the previous rolling mill will be opened when the head of the steel strip 11 arrives at the next rolling mill, for example When the head of the strip steel 11 rolled into the second rolling mill F2 by the first rolling mill F1 of the continuous casting slab reaches the third rolling mill F3, the first electromagnetic control valve 5 and the first electromagnetic control valve 5 on the second rolling mill F2 are opened. Two electromagnetic control valves 5A, open the first electromagnetic control valve 5 and the second electromagnetic control valve 5A on the third stand rolling mill F3 when the head of the strip steel 11 arrives at the fourth stand rolling mill F4..., and when the strip steel 11 Open the first electromagnetic control valve 5 and the second electromagnetic control valve 5A on the sixth rolling mill F6 when the head arrives at the seventh rolling mill F7; The first electromagnetic control valve and the second electromagnetic control valve 5A on the rolling mill F2 to the sixth rolling mill F6.

The nozzle installed on the first spray header 7 is positioned above the upper water cutting plate 9 next to the upper work roll 10, and the nozzle installed on the second spray header 7A is positioned on the lower cut water next to the lower work roll 10A. below the plate 9A. When the oil-water mixture from the first oil-water mixer 4 is sprayed onto the roll surface of the upper work roll 10 and the oil-water mixture from the second oil-water mixer 4A is sprayed onto the roll surface of the lower work roll 10A, in the heat of the strip 11 During the rolling process, most of the rolling oil quickly forms an oil film through the deformation zone, does not undergo chemical changes and maintains lubricating properties.

Install the upper cooling water header 8 between the first spray header 7 next to the upper work roll 10 and the upper water cutting plate 9, and install the lower cooling water header 8A on the second spray header next to the lower work roll 10A Between the pipe 7A and the lower cutting water plate 9A. In order to ensure the lubrication effect of the roll gap between the upper work roll 10 and the lower work roll 10A of each stand during the hot rolling of the strip steel 11, it is necessary to close the upper cooling water collector on the entrance side of the second rolling mill F2 to the sixth rolling mill F6. The cooling water in the pipe 8 and the lower cooling water header 8A is used only after the roll gap lubrication of the second rolling mill F2 to the sixth rolling mill F6 is completed, and the upper cooling water header 8 and the lower cooling water header 8A are used respectively. The upper work roll 10 and the lower work roll 10A are cooled.

During the lubrication process from the second rolling mill F2 to the sixth rolling mill F6, regularly check the working effect of the upper water cutting plate 9 and the lower water cutting plate 9A to prevent the oil-water mixture from flowing directly onto the strip 11, and at the same time regularly check the upper Check whether the cooling water in the cooling water header 8 and the lower cooling water header 8A leaks, check the working status of the first electromagnetic control valve 5 and the second electromagnetic control valve 5A, and check whether the first oil supply metering pump 3 and the second electromagnetic control valve Second, whether the (rolling) lubricating oil from the oil supply metering pump 3A leaks.

After the work roll gap is lubricated, the rolling force of each stand decreases as follows: the second stand F2 is 11-13%, the third stand F3 is 8-10%, the fourth stand F4 is 6-8%, The fifth stand F5 is 5-6% and the sixth stand F6 is 3-5%.

Embodiment 1: be that 1.2mm ultra-thin hot-rolled steel strip (plate strip) is produced thickness with 6 times of conventional rolling continuous casting slabs

Start the oil supply pump 2 installed next to the oil tank 1, and the oil supply pump 2 sends lubricating oil into the first oil supply metering pump 3 and the second oil supply metering pump 3A (the first oil supply metering pump 3 controls the flow rate of the upper work roll 10). lubricating oil, the lubricating oil of the lower work roll 10A is controlled by the second oil supply metering pump 3A), and the first electromagnetic control valve 5 and the second electromagnetic control valve 5A are opened at the same time, and the lubricating oil is passed through the first oil supply pipe 14, the second The oil supply pipe 14A feeds into the first oil-water mixer 4 and the second oil-water mixer 4A respectively. The decompression valve 15 is activated, and the filtered circulating water enters the first oil-water mixer 4 through the first water supply pipe 13 one way after decompression, and the other way enters the second oil-water mixer 4A through the second water supply pipe 13A.

The upper work roll 10 and the lower work roll 10A of the first rolling mill F1 and the seventh rolling mill F7 (last stand) are not lubricated, and the head and tail of the strip steel 11 are not lubricated during the hot rolling process. Lubricating devices are installed on the rolling mill F2 to the sixth rolling mill F6. Open the first electromagnetic control valve 5 and the second electromagnetic control valve 5A on the previous rolling mill when the head of the strip 11 arrives at the next rolling mill, and close the valves on all rolling mills when the tail end of the strip 11 arrives at the seventh rolling mill. The first electromagnetic control valve 5 and the second electromagnetic control valve 5A.

Control the lubricating oil and circulating water flow of the second rolling mill F2 and the third rolling mill F3: the lubricating oil flow into the first oil-water mixer 4 and the second oil-water mixer 4A is 45ml/min and the circulating water flow is 50l/min ; Control the lubricating oil and circulating water flow of the fourth rolling mill F4, the fifth rolling mill F5 and the sixth rolling mill F6: the amount of lubricating oil entering the first oil-water mixer 4 and the second oil-water mixer 4A is 60ml/min and The circulating water volume is 55l/min. The formed oil-water mixture is uniformly sprayed on the roll surfaces of the upper work roll 10 and the lower work roll 10A along the upper work roll 10 or along the longitudinal direction of the lower work roll 10A. When lubricating the roll gaps of the upper work roll 10 and the lower work roll 10A of the second stand F2, the third stand F3, the fourth stand F4, the fifth stand F5 and the sixth stand F6, close the first The cooling water of the upper cooling water header 8 and the lower cooling water header 8A on the inlet side of the second rolling mill F2 to the sixth rolling mill F6.

After the roll gap is lubricated, the rolling force of the second rolling mill F2 decreases by 13%, the rolling force of the third rolling mill F3 decreases by 10%, the rolling force of the fourth rolling mill F4 decreases by 8%, and the rolling force of the fifth The rolling force reduction of stand rolling mill F5 is 6% and the rolling force reduction of sixth rolling stand F6 is 5%.

During the rolling process of the steel strip 11, the rolling is stable, the vibration of the rolling mill is reduced, the center thickness deviation of the strip steel 11 is 20-40 μm, and the convexity of the plate surface is 20-30 μm.

Embodiment 2: be that 1.0mm ultra-thin hot-rolled steel strip (plate strip) is produced thickness with length being 4 times of conventional rolling continuous casting slab

Start the oil supply pump 2 installed next to the oil tank 1, and the oil supply pump 2 sends lubricating oil into the first oil supply metering pump 3 and the second oil supply metering pump 3A (that is, the upper work roll 10 is controlled by the first oil supply metering pump 3 lubricating oil, the lubricating oil of the lower work roll 10A is controlled by the second oil supply metering pump 3A), and the first electromagnetic control valve 5 and the second electromagnetic control valve 5A are opened at the same time, and the lubricating oil is passed through the first oil supply pipe 14, the second The two oil supply pipes 14A are sent into the first oil-water mixer 4 and the second oil-water mixer 4A respectively. The decompression valve 15 is activated, and the filtered circulating water enters the first oil-water mixer 4 through the first water supply pipe 13 one way after decompression, and the other way enters the second oil-water mixer 4A through the second water supply pipe 13A.

The upper work roll 10 and the lower work roll 10A of the first rolling mill F1 and the seventh rolling mill F7 (last stand) are not lubricated, and the head and tail of the strip steel 11 are not lubricated during the hot rolling process. Lubricating devices are installed on the rolling mill F2 to the sixth rolling mill F6. Open the first electromagnetic control valve 5 and the second electromagnetic control valve 5A on the previous rolling mill when the head of the strip 11 arrives at the next rolling mill, and close the first electromagnetic control valve 5A on all rolling mills when the tail end of the strip 11 arrives at the seventh rolling mill A solenoid valve 5 and a second solenoid valve 5A.

Control the lubricating oil and circulating water flow of the second rolling mill F2 and the third rolling mill F3: the lubricating oil flow entering the first oil-water mixer 4 and the second oil-water mixer 4A is 40ml/min and the circulating water flow is 50l/min ; Control the lubricating oil and circulating water flow of the fourth rolling mill F4, the fifth rolling mill F5 and the sixth rolling mill F6: the lubricating oil flow entering the first oil-water mixer 4 and the second oil-water mixer 4A is 55ml/min and The circulating water flow rate is 57l/min. The formed oil-water mixture is uniformly sprayed on the roll surfaces of the upper work roll 10 and the lower work roll 10A along the longitudinal direction of the upper work roll 10 and the lower work roll 10A. When lubricating the roll gaps of the upper work roll 10 and the lower work roll 10A of the second stand F2, the third stand F3, the fourth stand F4, the fifth stand F5 and the sixth stand F6, close the first The cooling water of the upper cooling water header 8 and the lower cooling water header 8A on the inlet side of the second rolling mill F2 to the sixth rolling mill F6.

After the roll gap is lubricated, the rolling force of the second rolling mill F2 decreases by 11%, the rolling force of the third rolling mill F3 decreases by 8%, the rolling force of the fourth rolling mill F4 decreases by 6%, and the rolling force of the fifth rolling mill F4 decreases by 6%. The rolling force reduction of stand rolling mill F5 is 5% and that of the sixth rolling mill F6 is 3%.

During the rolling process of the strip steel 11, the rolling is stable, the vibration of the rolling mill is reduced, the center thickness deviation of the strip steel 11 is 20-35 μm, and the convexity of the plate surface is 20-30 μm.

Claims (4)

1. roll gap lubrication method of producing ultra-thin hot-rolled strip steel with semi-endless rolled technology, oil feed pump (2) is connected the rear end of fuel tank (1), the port of export of oil feed pump (2) is connected with the first fuel feeding measuring pump (3) and the second fuel feeding measuring pump (3A), first fuel feed pump (14) is connected between the first fuel feeding measuring pump (3) and first solenoid electric valve (5), second fuel feed pump (14A) is connected between the second fuel feeding measuring pump (3A) and second solenoid electric valve (5A), and the port of export of first solenoid electric valve (5) and second solenoid electric valve (5A) links to each other with the arrival end of first oil-water mixer (4) and second oil-water mixer (4A) respectively; First feed pipe (13) that is communicated with pressure-reducing valve (15) links to each other with the arrival end of first oil-water mixer (4) behind first Water supply switch valve (12) and first water yield adjusting control valve (6), and second feed pipe (13A) that is communicated with pressure-reducing valve (15) links to each other with the arrival end of second oil-water mixer (4A) behind second Water supply switch valve (12A) and second water yield adjusting control valve (6A); First oil-water mixer (4) connects first spray thrower (7) through flexible pipe, second oil-water mixer (4A) connects second spray thrower (7A) through flexible pipe, be installed on first spray thrower (7) and go up its quantity and be positioned at the top of other the last water discharging board (9) of top working roll (10), be installed on second spray thrower (7A) and go up its quantity is positioned at the other following water discharging board (9A) of bottom working roll (10A) more than or equal to 1 nozzle below more than or equal to 1 nozzle; Last cooling water collector (8) is positioned between top working roll (10) other first spray thrower (7) and last water discharging board (9), and following cooling water collector (8A) is positioned between bottom working roll (10A) other second spray thrower (7A) and following water discharging board (9A); It is characterized in that: control the aperture of first solenoid electric valve (5) and second solenoid electric valve (5A) well, making the flow of lubrication that enters first oil-water mixer (4) and second oil-water mixer (4A) behind first fuel feed pump (14) and second fuel feed pump (14A) is 50～100ml/min, control the aperture of first water yield adjusting control valve (6) and second water yield adjusting control valve (6A), making the circulating water flow that enters first oil-water mixer (4) and second oil-water mixer (4A) behind flow through first feed pipe (13) and second feed pipe (13A) is 40～60l/min; The roll surface of the nozzle ejection of the oil water mixture in first oil-water mixer (4) on first spray thrower (7), the roll surface of the nozzle ejection of the oil water mixture in second oil-water mixer (4A) on second spray header (7A) to bottom working roll (10A) to top working roll (10).

2. the roll gap lubrication method that the semi-endless rolled technology of a kind of usefulness according to claim 1 is produced ultra-thin hot-rolled strip steel is characterized in that: do not realize lubricated to first rolling mill (F1) of finishing tandem rolling unit and the roll gap of top working roll (10) on the 7th rolling mill (F7) and bottom working roll (10A) in the course of hot rolling of band steel (11).

3. the roll gap lubrication method that the semi-endless rolled technology of a kind of usefulness according to claim 1 is produced ultra-thin hot-rolled strip steel, it is characterized in that: in the course of hot rolling of band steel (11), when reaching the frame of next rolling mill, opens on the head of band steel (11) first solenoid electric valve (5) and second solenoid electric valve (5A) on the last rolling mill, first solenoid electric valve (5) and second solenoid electric valve (5A) on when the afterbody of being with steel (11) arrives the 7th rolling mill (F7) frame, closing from second rolling mill (F2) to the 6th rolling mill (F6).

4. the roll gap lubrication method that the semi-endless rolled technology of a kind of usefulness according to claim 1 is produced ultra-thin hot-rolled strip steel, it is characterized in that: in the course of hot rolling of band steel (11), close the last cooling water collector (8) from second rolling mill (F2) to the 6th rolling mill (F6) entrance side and the cooling water of following cooling water collector (8A).

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