阅读说明：本技术 一种紧凑式双机架板材粗轧机及其轧制方法 (Compact type double-frame plate roughing mill and rolling method thereof ) 是由 陈育生 于 2020-07-10 设计创作，主要内容包括：本发明公开了一种紧凑式双机架板材粗轧机及其轧制方法,所述粗轧机包括依次设置的入口辊道、入口推床、入口轧机层流及除鳞装置、第一水平粗轧机、立辊轧机、中间辊道、第二水平粗轧机、出口轧机层流及除鳞装置、出口推床、出口辊道,其轧制方法包括加热、板坯氧化物清除、中间坯轧制、中轧或精轧；本发明通过合理的设备配置及工艺流程,精简缩短了板材粗轧生产线长度,缩短了板材粗轧阶段所花费的时间,提高了板材粗轧效率,使粗轧坯外形尺寸质量更稳定,极大提升了产量规模；本发明极大精简了粗轧机及其入、出口地辊和中间地辊的长度,缩短粗轧生产线长度,减少了粗轧机及其地辊占地的厂房投资,节约了场地。(The invention discloses a compact double-frame plate roughing mill and a rolling method thereof, wherein the roughing mill comprises an inlet roller way, an inlet push bed, an inlet mill laminar flow and descaling device, a first horizontal roughing mill, a vertical roller mill, an intermediate roller way, a second horizontal roughing mill, an outlet mill laminar flow and descaling device, an outlet push bed and an outlet roller way which are sequentially arranged; through reasonable equipment configuration and process flow, the method simplifies and shortens the length of a plate rough rolling production line, shortens the time spent in the plate rough rolling stage, improves the plate rough rolling efficiency, enables the outline dimension quality of a rough rolling blank to be more stable, and greatly improves the yield and the scale; the invention greatly simplifies the length of the roughing mill, the inlet and outlet ground rollers and the middle ground roller thereof, shortens the length of the roughing production line, reduces the factory building investment occupied by the roughing mill and the ground rollers thereof and saves the field.)

1. A compact double-frame plate roughing mill is characterized by comprising an inlet roller way (1), an inlet push bed (2), an inlet rolling mill laminar flow and descaling device (3), a first horizontal roughing mill (4), a middle roller way (6), a second horizontal roughing mill (7), an outlet rolling mill laminar flow and descaling device (8), an outlet push bed (9) and an outlet roller way (11) which are sequentially arranged; the distance between the first horizontal roughing mill (4) and the second horizontal roughing mill (7) is 7000mm to 7500 mm; a vertical rolling mill (5) is arranged between the inlet manipulator (2) and the outlet manipulator (9); the inlet roller way (1) is connected with a high-pressure plate blank descaling device, and the outlet roller way (11) is connected with a medium rolling or finish rolling area.

2. A compact double frame plate roughing mill according to claim 1 characterized in that said first horizontal roughing mill (4) and second horizontal roughing mill (7) are horizontal roughing mills with bending roll function; the first horizontal roughing mill (4) and the second horizontal roughing mill (7) have the same rolling width, and the rolling mode comprises electric rolling and hydraulic rolling, and the hydraulic rolling mode has an HAGC hydraulic automatic thickness control function.

3. A compact double frame plate roughing mill according to claim 1, characterized in that said vertical roll mill (5) is arranged between the first horizontal roughing mill (4) and an intermediate roll table (6), said intermediate roll table (6) being a free roll.

4. A compact double frame plate roughing mill according to claim 1, characterized in that said vertical rolling mill (5) is arranged between the entrance pusher (2) and the first horizontal roughing mill (4).

5. A compact double frame roughing mill according to claim 1, characterized in that the rolling speeds of said first horizontal roughing mill (4), said second horizontal roughing mill (7) and said vertical rolling mill (5) are comprised between 1.0m/s and 5.5m/s, and the rolling speeds of said first horizontal roughing mill (4) and said second horizontal roughing mill (7) have a speed difference comprised between 0.1m/s and 1.4 m/s.

6. The compact double-frame plate roughing mill according to claim 1, characterized in that the descaling pressure of the slab high-pressure water descaling device, the inlet mill laminar flow and descaling device (3) and the outlet mill laminar flow and descaling device (8) is 20-30 Mpa.

7. The rolling method of a compact double-stand plate roughing mill according to claim 1, comprising heating, slab oxide removal, intermediate slab rolling, intermediate rolling or finish rolling, characterized by comprising in particular the following steps:

A. heating: heating the plate blank (10) to 1100-1280 ℃ by a heating furnace, and discharging to a roller way (1);

B. and (3) removing the oxide of the plate blank: spraying high-pressure water to remove oxides on the upper surface and the lower surface of the slab (10) by adopting a slab high-pressure water descaling device, and conveying the slab (10) with the oxides removed to a rolling mill inlet roller way (1) by a roller way to perform intermediate slab rolling;

C. rolling the intermediate billet:

first-pass rolling: on an inlet roller way (1), an inlet push machine (2) carries out centering adjustment on a plate blank (10), then the plate blank (10) after centering adjustment is finished is sequentially conveyed and bitten into a first horizontal roughing mill (4) for rolling and a vertical roller mill (5), and then conveyed and bitten into a second horizontal roughing mill (7) for rolling through an intermediate roller way (6) until the tail of the plate blank (10) is out of a roll gap of the second horizontal roughing mill (7), and the speed is immediately reduced to stop the tail of the plate blank (10) on an outlet roller way (11) close to the roll gap of the second horizontal roughing mill (7) as far as possible, so that the 1 st pass of rolling is finished;

and 2, rolling for the second pass: after the centering adjustment is carried out on an outlet roller way (11) close to the side of the middle rolling or finishing mill area through an outlet push bed (9), the outlet roller way (11), a second horizontal rolling mill roughing mill (7) and a first horizontal rolling mill roughing mill (4) are simultaneously reversed, and a slab (10) after the centering adjustment is finished is reversely conveyed and bitten into the second horizontal roughing mill (7) for rolling; after the slab (10) is discharged from the second horizontal roughing mill, the slab is conveyed through an intermediate roller way (6), is conveyed in reverse in sequence and is bitten into the vertical rolling mill (5) and the first horizontal roughing mill (4) which are also reversed for rolling until the tail of the slab (10) is discharged from the roll gap of the first horizontal roughing mill (4), and is immediately decelerated to stop the tail of the slab (10) on an inlet roller way (1) close to the roll gap of the first horizontal roughing mill (4) as much as possible, so that the 2 nd-pass rolling is completed;

repeating the steps, carrying out reciprocating rolling for 3-5 times, and rolling the rolled piece (10) into an intermediate blank (10) with the thickness of 19-50 mm;

D. and conveying the obtained intermediate blank (10) to an intermediate rolling or finish rolling area through an outlet roller way (10) after odd number of last passes, and carrying out intermediate rolling or finish rolling stage rolling.

8. The rolling method of a compact double-stand plate roughing mill according to claim 1, comprising heating, slab oxide removal, intermediate slab rolling, intermediate rolling or finish rolling, characterized by comprising in particular the following steps:

A. heating: heating the plate blank (10) to 1100-1280 ℃ by a heating furnace, and discharging to a roller way (1);

B. and (3) removing the oxide of the plate blank: spraying high-pressure water to remove oxides on the upper surface and the lower surface of the slab (10) by adopting a slab high-pressure water descaling device, and conveying the slab (10) with the oxides removed to a rolling mill inlet roller way (1) by a roller way to perform intermediate slab rolling;

C. rolling the intermediate billet:

first-pass rolling: on an inlet roller way (1), an inlet push machine (2) carries out centering adjustment on a plate blank (10), then the plate blank (10) after centering adjustment is finished is conveyed to be engaged into a vertical roller mill (5) and a first horizontal roughing mill (4) in sequence for rolling, conveyed through an intermediate roller way (6) and engaged into a second horizontal roughing mill (7) for rolling until the tail of the plate blank (10) is out of a roll gap of the second horizontal roughing mill (7), and is decelerated immediately to stop the tail of the plate blank (10) on an outlet roller way (11) close to the roll gap of the second horizontal roughing mill (7) as far as possible, so that the 1 st pass of rolling is finished;

and 2, rolling for the second pass: after the centering adjustment is carried out on an outlet roller way (11) close to the side of the middle rolling or finishing mill area through an outlet push bed (9), the outlet roller way (11), a second horizontal rolling mill roughing mill (7) and a first horizontal rolling mill roughing mill (4) are simultaneously reversed, and a slab (10) after the centering adjustment is finished is reversely conveyed and bitten into the second horizontal roughing mill (7) for rolling; after the slab (10) is discharged from the second horizontal roughing mill, the slab is conveyed through an intermediate roller way (6), and is reversely conveyed in sequence to bite into the first horizontal roughing mill (4) for rolling and the vertical rolling mill (5) which are also reversely rotated until the tail part of the slab (10) is discharged from the roll gap of the vertical rolling mill (5), the speed is immediately reduced to stop the tail part of the slab (10) on an inlet roller way (1) close to the roll gap of the vertical rolling mill (5) as much as possible, and the 2 nd pass rolling is finished;

repeating the steps, carrying out reciprocating rolling for 3-5 times, and rolling the rolled piece (10) into an intermediate blank (10) with the thickness of 19-50 mm;

D. and conveying the obtained intermediate blank (10) to an intermediate rolling or finish rolling area through an outlet roller way (10) after odd number of last passes, and carrying out intermediate rolling or finish rolling stage rolling.

9. A rolling method according to claim 7 or 8, characterized in that in step B, the thickness of the slab (10) is 150 mm-300 mm, and the length of the slab is more than 7000mm after the first pass of the first horizontal roughing mill (4) is rolled; the descaling mode of the slab oxide is as follows: the symmetrical slab adopts a descaling mode of firstly removing the lower surface and two sides and then removing the upper surface; the special asymmetric composite slab (10) adopts a single-side descaling and cooling mode.

10. The rolling method according to claim 7 or 8, characterized in that, in the step C, the intermediate billet (10) is subjected to the inlet rolling mill laminar flow and descaling device (3) or the outlet rolling mill laminar flow and descaling device (8) to remove secondary iron scale and reduce the temperature, and the target temperature of the intermediate billet (10) for cooling is 900-1150 ℃; the target thickness of the rolling of the intermediate blank (10) is 19-50 mm; when the intermediate billet (10) is a final product, the target finish rolling temperature of cooling is 700-1000 ℃.

Technical Field

The invention belongs to the technical field of metallurgical rolling, and particularly relates to a compact type double-frame plate roughing mill and a rolling method thereof.

Background

The plate roughing mill is an important metallurgical rolling device for providing a microstructure intermediate billet with high dimensional accuracy, high surface quality and high performance for a medium rolling mill or a finishing mill group in plate production, and is a key device for improving the yield and the efficiency of the whole plate rolling mill group and a production line. Roughing generally requires a large reduction, and a large rolling moment. The existing plate roughing mill is generally a horizontal roughing mill with a vertical roll, or a horizontal roughing mill with a large distance between two frames with vertical rolls; the horizontal roughing mill gradually develops from two rolls to four rolls, and the vertical roll and the four-roll horizontal roughing mill are structurally integrated. The method comprises the following specific steps:

i, single frame horizontal roughing mill with vertical roll

All rough rolling passes are completed by reciprocating rolling on a horizontal rough rolling mill with vertical rolls, the number of reciprocating rolling passes is large, the time of the rough rolling stage is long, and the bottleneck of improving the yield and the production efficiency of the whole rolling line unit is solved. The vertical roll and the four-roll horizontal roughing mill are structurally integrated, a novel patent application number 200920288405.4 for practical use discloses an arrangement mode of the roughing double-stand vertical roll mill, and two vertical rolls are continuously arranged in front of an inlet of the horizontal roughing mill.

II, horizontal roughing mill with vertical rolls and large or close spacing

All rough rolling passes are respectively completed on a horizontal rough rolling mill with vertical rolls and another horizontal rough rolling mill, and the two horizontal rough rolling mills respectively complete a plurality of rough rolling passes. Ground rollers with certain lengths are required to be arranged in front of and behind the two horizontal rough rolling mills for placing rolled intermediate blank rolled pieces, the length of the ground rollers is required to meet the length of the rolled pieces which are continuously increased along with reduction and thinning, the length of the ground rollers in front of and behind each horizontal rough rolling mill is required to meet the length of the rolled pieces when the minimum intermediate blank thickness of the last pass of rough rolling of the rolling mills is placed, or the length of the ground rollers is required to meet the length of the rolled pieces when furnace coil boxes are arranged. For example, chinese patent "a method and apparatus for manufacturing a thin flat material", application No. 01813846.2, discloses a method and apparatus for manufacturing a thin flat material, which uses a roughing mill having one or more stands.

In order to improve the rolling rhythm of the whole rolling line and the yield and the efficiency of a horizontal roughing mill with a vertical roll and a large space between two frames, a strategy that the two horizontal roughing mills are in rolling production at the same time and do not interfere with each other is often adopted, so that the length of a ground roll between the two horizontal roughing mills needs to be increased to be more than twice of the length of an outlet ground roll of a single horizontal roughing mill with a vertical roll. And such a double-frame roughing mill with a larger or close space between two frames needs to perform accurate material tracking and rolling control on two or more rolled pieces, so that an interference accident of movement of the two or more rolled pieces is easy to occur, and the complexity and the operation difficulty of field production management are increased.

For example, the chinese patent application No. 201711181293.8 discloses a method for tracking and managing the set data of a double-stand roughing mill, which describes a method for tracking and managing the set data of a double-stand roughing mill, and describes a method for tracking and managing the set data of a double-stand roughing mill, in which the rough rolling area unit of some rolling lines is composed of two reversible horizontal rolling mills R1 and R2 and two vertical rolling mills E1 and E2, wherein the distance between R1 and R2 is such that the same billet cannot be rolled in the two horizontal rolling mills at the same time, but two or more rolled pieces can be rolled in the two horizontal rolling mills at the same time, respectively at R1 and R2.

Also like the chinese patent application "speed control method under multiple pass distribution mode of close-spaced double-stand roughing mill", application No. 201910002478.0, discloses a speed control method under multiple pass distribution mode of close-spaced double-stand roughing mill, describing that the roughing mill group of some rolling lines is provided with two reversible horizontal roll roughing mills R1 and R2, and the distance between R1 and R2 is shorter, in the process of a certain flat roll mill performing reversible rolling alone, the blank will pass through another rolling mill, the front and rear roll tables are both common to two rolling mills, especially the roll table between two rolling mills, the rear roll table when R1 rolls, and the front roll table when R2 rolls; the patent provides a speed control method of a close-spacing double-rack roughing mill under various pass distribution modes; the pass distribution of the horizontal rolling mill R1+ R2 adopts an N +0 or (N-1) +1 mode, or a 0+ N, 1+ N or 2+ N mode; that is, each pass is only one horizontal-roller roughing stand of R1 or R2 that actually rolls at a reduced pressure and the other roughing stand that actually runs at no reduced pressure, and is actually still a single roughing stand, the efficiency is still low.

Further, like the chinese patent application "a method for distributing the pressing load of a double-stand medium plate production line", application No. 200910235653.7, discloses a method for distributing the pressing load of a double-stand medium plate production line, the function and algorithm reasonably distributes the pressing load of two medium plate rolling mills, thereby avoiding one rolling mill from being in a waiting state and improving the efficiency of two stands; however, each rolling mill still rolls independently, although serial rolling can be realized, continuous rolling of two racks cannot be realized. Although such a horizontal roughing mill with a large or close spacing between the stands with vertical rolls improves rolling yield and efficiency, the production of the roughing mill and the floor space occupied by the rolls are about twice or more longer than that of a horizontal roughing mill with vertical rolls in a single stand, which significantly increases the plant area and still fails to achieve a continuous rolling relationship between the stands.

In summary, how to shorten the rolling time in the rough rolling stage, ensure a shorter production line length, improve the rolling efficiency, realize continuous rolling of two stands, and provide a rough rolling intermediate billet with high dimensional accuracy, good surface quality, guaranteed temperature, and high microstructure performance for a subsequent intermediate rolling mill or finishing mill group is a problem that needs to be solved urgently by current research and development personnel.

Disclosure of Invention

In view of the above problems, a first object of the present invention is to provide a compact double frame plate roughing mill, and a second object of the present invention is to provide a rolling method of the compact double frame plate roughing mill.

The first purpose of the invention is realized in such a way that a compact double-frame plate roughing mill comprises an inlet roller way, an inlet push bed, an inlet rolling mill laminar flow and descaling device, a first horizontal roughing mill, an intermediate roller way, a second horizontal roughing mill, an outlet rolling mill laminar flow and descaling device, an outlet push bed and an outlet roller way which are sequentially arranged; the distance between the first horizontal roughing mill and the second horizontal roughing mill is 7000mm to 7500 mm; a vertical rolling mill is arranged between the inlet manipulator and the outlet manipulator; the inlet roller way is connected with a high-pressure descaling device for the plate blank, and the outlet roller way is connected with a middle rolling or finish rolling area.

The second purpose of the invention is to provide a rolling method of a compact double-frame plate roughing mill, which comprises the steps of heating, removing the oxide of a plate blank, rolling an intermediate blank, and carrying out intermediate rolling or finish rolling, and specifically comprises the following steps:

A. heating: heating the plate blank to 1100-1280 ℃ by a heating furnace, and discharging to a roller way;

B. and (3) removing the oxide of the plate blank: spraying high-pressure water to remove oxides on the upper surface and the lower surface of the plate blank by adopting a plate blank high-pressure water descaling device, and conveying the plate blank with the oxides removed to a roller way at the inlet of a rolling mill by a roller way to perform intermediate blank rolling;

C. rolling the intermediate billet:

first-pass rolling: on an inlet roller way, an inlet pusher carries out centering adjustment on the plate blank, then the plate blank after centering adjustment is conveyed and bitten into a first horizontal roughing mill for rolling and a vertical roller mill in sequence or conveyed and bitten into the vertical roller mill and the first horizontal roughing mill in sequence for rolling, and then the plate blank is conveyed and bitten into a second horizontal roughing mill for rolling through an intermediate roller way until the tail part of the plate blank is out of a roll gap of the second horizontal roughing mill, and the speed is reduced immediately so that the tail part of the plate blank is stopped on an outlet roller way close to the roll gap of the second horizontal roughing mill as much as possible, and the 1 st pass of rolling is completed;

and 2, rolling for the second pass: after centering adjustment is carried out on an outlet roller way close to the side of the middle rolling or finishing mill area through an outlet push bed, the outlet roller way is simultaneously reversed with a second horizontal rolling mill roughing mill and a first horizontal rolling mill roughing mill, and a slab after centering adjustment is reversely conveyed and bitten into the second horizontal roughing mill for rolling; after the slab exits from the second horizontal roughing mill, the slab is conveyed through an intermediate roller way, is reversely conveyed in sequence and bites into the vertical rolling mill and the first horizontal roughing mill which are also reversely rotated for rolling until the tail of the slab exits from the first horizontal roughing mill or the roll gap of the vertical rolling mill arranged as shown in the figure 2, and is immediately decelerated to stop the tail of the slab on an entrance roller way close to the roll gap position of the first horizontal roughing mill or the vertical rolling mill arranged as shown in the figure 2 as much as possible, so that the 2 nd pass rolling is completed;

repeating the steps, carrying out reciprocating rolling for 3-5 times, and rolling the rolled piece into an intermediate blank with the thickness of 19-50 mm;

D. and conveying the obtained intermediate blank to a medium rolling or finish rolling area through an outlet roller way after odd number of last passes, and carrying out medium rolling or finish rolling stage rolling.

According to the compact type double-frame plate roughing mill developed by the invention, the two horizontal roughing mills and the ground rolls thereof have shorter production line length, and the two horizontal roughing mills can simultaneously press down and roll to form a continuous rolling relation instead of one of the two horizontal roughing mills passing through, so that the rolling time in the roughing stage is shorter, the yield and efficiency of the whole mill set are improved, and a roughing intermediate blank with high dimensional precision, good surface quality, guaranteed temperature and good microstructure and high performance can be provided for a subsequent medium mill or finishing mill set.

Drawings

Fig. 1 is a schematic structural view of a compact double frame plate roughing mill with a vertical roll mill arranged between a first horizontal roughing mill and a middle roller way;

FIG. 2 is a schematic structural view of a compact two-stand plate roughing mill with a vertical rolling mill disposed between an inlet ram and a first horizontal roughing mill;

the system comprises 1-inlet roller way, 2-inlet pusher, 3-inlet rolling mill laminar flow and descaling device, 4-first horizontal roughing mill, 5-vertical rolling mill, 6-intermediate roller way, 7-second horizontal roughing mill, 8-outlet rolling mill laminar flow and descaling device, 9-outlet pusher, 10-slab (intermediate blank or rolled piece) and 11-outlet roller way.

Detailed Description

The invention is further described with reference to the accompanying drawings, but the invention is not limited in any way, and any alterations or substitutions based on the teaching of the invention are within the scope of the invention.

The invention relates to a compact double-frame plate roughing mill, which comprises an inlet roller way 1, an inlet push lathe 2, an inlet rolling mill laminar flow and descaling device 3, a first horizontal roughing mill 4, a middle roller way 6, a second horizontal roughing mill 7, an outlet rolling mill laminar flow and descaling device 8, an outlet push lathe 9 and an outlet roller way 11 which are sequentially arranged; the distance between the first horizontal roughing mill 4 and the second horizontal roughing mill 7 is 7000mm to 7500 mm; a vertical rolling mill 5 is arranged between the inlet manipulator 2 and the outlet manipulator 9; the inlet roller way 1 is connected with a high-pressure plate blank descaling device, and the outlet roller way 11 is connected with a middle rolling or finish rolling area.

The first horizontal roughing mill 4 and the second horizontal roughing mill 7 are horizontal roughing mills with roll bending functions; the first horizontal roughing mill 4 and the second horizontal roughing mill 7 have the same rolling width, and the rolling mode thereof includes electric rolling and hydraulic rolling, and the hydraulic rolling mode has an HAGC hydraulic automatic thickness control function.

As shown in fig. 1, the vertical rolling mill 5 is arranged between the first horizontal roughing mill 4 and the intermediate rollerway 6. The intermediate roller table 6 is a free roller.

As shown in fig. 2, the edger mill 5 is disposed between the entrance bench 2 and the first horizontal roughing mill 4.

The rolling speeds of the first horizontal roughing mill 4, the second horizontal roughing mill 7 and the vertical rolling mill 5 are 1.0-5.5 m/s, and a certain speed difference of 0.1-1.4 m/s exists between the rolling speeds of the first horizontal roughing mill 4 and the second horizontal roughing mill 7 so as to balance the metal flow of the two frames;

the descaling pressure of the plate blank high-pressure water descaling device, the inlet rolling mill laminar flow and descaling device 3 and the outlet rolling mill laminar flow and descaling device 8 is 20-30 Mpa; the plate blank high-pressure water descaling device adopts a split structure with the upper surface, the lower surface and two sides respectively for descaling, or an integrated structure device with the lower surface, the upper surface and two sides for descaling and combining; and a centering guide and guard device is arranged at the inlet of the slab high-pressure water descaling device.

The inlet manipulator 2 and the outlet manipulator 9 are both in hydraulic transmission.

Taking fig. 1 in which a vertical roll mill 5 is arranged between a first horizontal roughing mill 4 and an intermediate roller table 6 as an example, the rolling method of the compact type double-stand plate roughing mill of the invention comprises the steps of heating, plate blank oxide removal, intermediate blank rolling, intermediate rolling or finish rolling, and specifically comprises the following steps:

A. heating: heating the plate blank 10 to 1100-1280 ℃ by a heating furnace, and discharging to a roller way 1;

B. and (3) removing the oxide of the plate blank: spraying high-pressure water to remove oxides on the upper surface, the lower surface and two side surfaces of the plate blank 10 by adopting a plate blank high-pressure water descaling device, and conveying the plate blank 10 with the oxides removed to a rolling mill inlet roller way 1 by a roller way to perform intermediate blank rolling;

C. rolling the intermediate billet:

first-pass rolling: on an inlet roller way 1, an inlet push machine 2 carries out centering adjustment on a plate blank 10, then the plate blank 10 after centering adjustment is conveyed to be bitten into a first horizontal roughing mill 4 for rolling and a vertical roller mill 5 in sequence, and then conveyed and bitten into a second horizontal roughing mill 7 for rolling through an intermediate roller way 6 until the tail part of the plate blank 10 is out of a gap of the second horizontal roughing mill 7, and the speed is reduced immediately to stop the tail part of the plate blank 10 on an outlet roller way 11 close to the gap of the second horizontal roughing mill 7 as far as possible, so that the 1 st rolling pass is completed;

and 2, rolling for the second pass: after centering adjustment is carried out on an outlet roller way 11 close to the side of the middle rolling or finishing mill area through an outlet push bed 9, the outlet roller way 11, a second horizontal rolling mill roughing mill 7 and a first horizontal rolling mill roughing mill 4 are simultaneously reversed, and a slab 10 after centering adjustment is reversely conveyed and bitten into the second horizontal roughing mill 7 for rolling; after the slab 10 exits from the second horizontal roughing mill, the slab is conveyed through the intermediate roller table 6, and is sequentially conveyed in a reverse direction to bite into the vertical rolling mill 5 and the first horizontal roughing mill 4 which are also reversed to be rolled until the tail of the slab 10 exits from the first horizontal roughing mill, and the speed is immediately reduced to stop the tail of the slab 10 on the inlet roller table 1 close to the first horizontal roughing mill 4 as much as possible, so that the 2 nd-pass rolling is completed;

repeating the steps, carrying out reciprocating rolling for 3-5 times, and rolling the rolled piece 10 into an intermediate blank 10 with the thickness of 19-50 mm;

D. and conveying the obtained intermediate blank 10 to a middle rolling or finish rolling area through an outlet roller way 11 after odd number of last passes, and carrying out middle rolling or finish rolling.

Taking fig. 2 in which a vertical rolling mill 5 is arranged between an inlet pusher 2 and a first horizontal roughing mill 4 as an example, the rolling method of the compact type double-stand plate roughing mill of the invention comprises the steps of heating, slab oxide removal, intermediate blank rolling, intermediate rolling or finish rolling, and specifically comprises the following steps:

A. heating: heating the plate blank 10 to 1100-1280 ℃ by a heating furnace, and discharging to a roller way 1;

B. and (3) removing the oxide of the plate blank: spraying high-pressure water to remove oxides on the upper surface and the lower surface of the plate blank 10 by adopting a plate blank high-pressure water descaling device, and conveying the plate blank (10) with the oxides removed to a rolling mill inlet roller way 1 by a roller way to perform intermediate blank rolling work;

C. rolling the intermediate billet:

first-pass rolling: on an inlet roller way 1, an inlet push machine 2 carries out centering adjustment on a plate blank 10, the plate blank 10 after centering adjustment is conveyed into a vertical roller mill 5 and a first horizontal roughing mill 4 in sequence for rolling, then conveyed through an intermediate roller way 6 and gripped into a second horizontal roughing mill 7 for rolling until the tail part of the plate blank 10 is out of a gap of the second horizontal roughing mill 7, and the speed is reduced immediately so that the tail part of the plate blank 10 stops on an outlet roller way 11 close to the gap of the second horizontal roughing mill 7 as far as possible, and the 1 st rolling pass is completed;

and 2, rolling for the second pass: after centering adjustment is carried out on an outlet roller way 11 close to the side of the middle rolling or finishing mill area through an outlet push bed 9, the outlet roller way 11, a second horizontal rolling mill roughing mill 7 and a first horizontal rolling mill roughing mill 4 are simultaneously reversed, and a slab 10 after centering adjustment is reversely conveyed and bitten into the second horizontal roughing mill 7 for rolling; after the slab 10 is delivered out of the second horizontal roughing mill, the slab is conveyed through the middle roller table 6, and is sequentially conveyed in a reverse direction to bite into the first horizontal roughing mill 4 and the vertical rolling mill 5 which are also reversed in the reverse direction until the tail part of the slab 10 is delivered out of the roll gap of the vertical rolling mill 5, the speed is immediately reduced, so that the tail part of the slab 10 is stopped on the inlet roller table 1 close to the roll gap of the vertical rolling mill 5 as much as possible, and the 2 nd-pass rolling is completed;

repeating the steps, carrying out reciprocating rolling for 3-5 times, and rolling the rolled piece 10 into an intermediate blank 10 with the thickness of 19-50 mm;

D. and conveying the obtained intermediate blank 10 to a middle rolling or finish rolling area through an outlet roller way 11 after odd number of last passes, and carrying out middle rolling or finish rolling.

In the step B, the thickness of the plate blank 10 is 150 mm-300 mm, and the length of the plate blank 10 is more than 7000mm after the plate blank is rolled by the first horizontal roughing mill in the first pass;

the descaling mode of the slab oxide is as follows: the symmetrical slab 10 adopts a descaling mode of firstly removing the lower surface and two sides and then removing the upper surface; the special asymmetric composite slab 10 adopts a single-side descaling and cooling mode.

In the step C, removing secondary iron scales and cooling the intermediate blank 10 by an inlet rolling mill laminar flow and descaling device 3 or an outlet rolling mill laminar flow and descaling device 8, wherein the pressure of descaling water is 20-30 Mpa; the target temperature of the cooling of the intermediate billet 10 is 900-1150 ℃ so as to meet the process requirement of TMCP thermomechanical rolling of the thick plate, obtain the required microstructure and finally obtain good comprehensive mechanical properties of metal;

the target thickness of the intermediate blank in rolling is 19-50 mm; when the intermediate billet 10 is a final product, the target finish rolling temperature of cooling is 700-1000 ℃.

The inlet manipulator 2 and the outlet manipulator 9 adopt hydraulic transmission.

And the descaling pressure of the plate blank high-pressure water descaling device, the inlet rolling mill laminar flow and descaling device 3 and the outlet rolling mill laminar flow and descaling device 8 is 20-30 Mpa.

The plate blank high-pressure water descaling device adopts a split structure in which the lower surface descaling, the two side surface descaling and the upper surface descaling are respectively arranged, or an integrated structure device in which the lower surface descaling, the two side surface descaling and the upper surface descaling are combined; and a centering guide and guard device is arranged at the inlet of the slab high-pressure water descaling device.

The present invention is described in further detail below by way of examples.