A bar wire continuous casting and rolling production line and a production method thereof

Abstract

The application provides a bar and wire rod continuous casting and rolling production line and a production method thereof, and belongs to the technical field of rolling steel. In order to solve the problem that the production capacity of rolling steel equipment is not fully utilized in the existing continuous casting and rolling arrangement mode, the application provides the bar and wire rod continuous casting and rolling production line, which comprises a continuous casting machine (1), a continuous casting billet roller way (2), a rough rolling unit (3), a medium rolling unit (5) and a first finishing rolling unit (7) arranged in sequence along the rolling direction. The continuous casting machine (1) can simultaneously produce multi-flow continuous casting billets (9). The continuous casting billet roller way (2) comprises a plurality of conveying roller ways (201), and the plurality of conveying roller ways (201) can simultaneously send the multi-flow continuous casting billets (9) into the rough rolling unit (3). The bar and wire rod continuous casting and rolling production line and the production method thereof can fully utilize the maximum capacity of the rear rolling steel equipment, and further improve the production capacity of the whole production line.

Description

Technical Field

[0001] This invention relates to the field of steel rolling technology, specifically to a continuous casting and rolling production line for bars and wire rods and its production method. Background Technology

[0002] Minimizing the distance between steelmaking and rolling, transforming steel from a liquid state into a finished product in the shortest possible time, and achieving the lowest energy consumption and smallest footprint in steel production, is the ultimate goal of future steel rolling production lines. Continuous casting and rolling technology can directly roll continuously cast billets into the final product, eliminating intermediate processes such as billet segmentation, storage, billet grinding, and billet reheating, significantly improving production efficiency. It will be the preferred production method for non-alloy ordinary steel for some time to come.

[0003] The current layout of continuous casting and rolling production lines is such that one continuous casting line corresponds to one subsequent rolling line. Taking the commonly used 160 cubic meter continuous casting billet as an example, the fastest billet drawing speed in current continuous casting and rolling production lines is only about 0.1 m / s. The hourly output of the rolling line following each continuous casting line is limited by the billet drawing speed, which, based on 160 cubic meters and 0.1 m / s, is approximately 70 t / h. In contrast, the mainstream non-continuous casting and rolling rebar production lines currently have an hourly output of around 200 t / h per line.

[0004] Therefore, the traditional continuous casting and rolling layout (one continuous casting line corresponding to one subsequent rolling mill line) has the problem that the production capacity of a large number of rolling mill equipment on the rolling mill production line cannot be fully utilized. This is one of the reasons why continuous casting and rolling lines have not been widely adopted. Summary of the Invention

[0005] To address the issue of underutilization of the production capacity of rolling mill equipment in existing continuous casting and rolling arrangements, this invention provides a bar and wire rod continuous casting and rolling production line and its production method. This bar and wire rod continuous casting and rolling production line and its production method can fully utilize the maximum capacity of the downstream rolling mill equipment, thereby increasing the overall production capacity of the production line.

[0006] The technical solution adopted by the embodiments of the present invention to solve its technical problem is as follows: A continuous casting and rolling production line for bars and wire rods includes a continuous casting machine, a continuous casting billet roller table, a roughing mill, an intermediate mill, and a first finishing mill arranged sequentially along the rolling direction. The continuous casting machine can simultaneously produce multi-strand continuous casting billets. The continuous casting billet roller table contains multiple conveying roller tables that can simultaneously feed multi-strand continuous casting billets into the roughing mill. The roughing mill contains multiple roughing mills, each of which can simultaneously roll multi-strand continuous casting billets. The intermediate mill contains multiple intermediate mills, each of which can simultaneously roll multi-strand continuous casting billets. The first finishing mill contains multiple first finishing mills, each of which can simultaneously roll multi-strand continuous casting billets.

[0007] A method for continuous casting and rolling of bar and wire rods, wherein the method employs the aforementioned continuous casting and rolling production line for bar and wire rods, and the method comprises the following steps in sequence: Step 1: The continuous casting machine simultaneously produces multi-strand continuous casting billets; Step 2: The continuous casting billet roller conveyor simultaneously feeds multiple strands of continuous casting billets into the roughing mill. Step 3: Each roughing mill in the roughing mill unit simultaneously rolls multi-strand continuous billets; Step 4: Each intermediate rolling mill in the intermediate rolling mill group simultaneously rolls multi-strand continuous billets; Step 5: Each first finishing mill in the first finishing mill group simultaneously rolls multi-flow continuous casting billets.

[0008] The beneficial effect of this invention is that it can fully utilize the maximum capacity of the rear rolling mill equipment, thereby increasing the overall production capacity of the production line. Attached Figure Description

[0009] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0010] Figure 1 This is a top view schematic diagram of the bar and wire continuous casting and rolling production line described in this invention.

[0011] Figure 2 This is a simplified schematic diagram of the multiple roughing passes of the fourth roughing mill.

[0012] Figure 3 This is a simplified schematic diagram of the fourth roughing mill rolling multiple continuously cast billets.

[0013] Figure 4 This is a simplified schematic diagram of multiple intermediate rolling passes on the second intermediate rolling mill.

[0014] Figure 5 This is a simplified schematic diagram of the multiple first finishing rolling passes of the second first finishing mill.

[0015] The annotations in the attached figures are explained as follows: 1. Continuous casting machine; 2. Continuous casting billet roller table; 3. Roughing mill; 4. First flying shear; 5. Intermediate mill; 6. Second flying shear; 7. First finishing mill; 8. Rolling passage; 9. Continuous casting billet; 201. Conveyor roller conveyor; 202. Spreading section; 203. Transition section; 204. Gathering section; 301. Roughing mill; 302. Roughing pass; 303. First roughing mill; 304. Second roughing mill; 305. Third roughing mill; 306. Fourth roughing mill; 307. Fifth roughing mill; 308. Sixth roughing mill; 501. Intermediate rolling mill; 502. Intermediate rolling pass; 503. First intermediate rolling mill; 504. Second intermediate rolling mill; 505. Third intermediate rolling mill; 506. Fourth intermediate rolling mill; 507. Fifth intermediate rolling mill; 508. Sixth intermediate rolling mill; 701. First finishing mill; 702. First finishing roll pass; 703. First finishing mill (unit 1); 704. Second finishing mill (unit 2); 801. Second finishing mill; 802. High-speed wire rod finishing mill; 803. Reduction sizing mill; 8011, Second Finishing Mill. Detailed Implementation

[0016] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] For ease of understanding and description, the following description of the present invention uses absolute positional relationships. Unless otherwise specified, the directional term "above" indicates perpendicular to. Figure 1 The direction of the paper is pointed outwards from the paper surface; the directional word "down" indicates perpendicular to the direction of the paper surface. Figure 1 The direction of the paper and the direction pointing inwards from the paper; the directional word "left" indicates... Figure 1 The left side of the direction, the directional word "right" indicates Figure 1 The right-hand direction in the text, the directional word "front" indicates Figure 1 The direction above, the directional word "back" indicates Figure 1 The orientation is described from the reader's or user's perspective, but the above directional terms should not be construed as limiting the scope of protection of this invention. Regarding the material, weight, size, angle, and parameters of the components, those skilled in the art can determine or replace them according to actual needs or a limited number of experiments.

[0018] In this embodiment, as Figure 1As shown, the bar and wire rod continuous casting and rolling production line includes a continuous casting machine 1, a continuous casting billet roller table 2, a roughing mill 3, an intermediate mill 5, and a first finishing mill 7 arranged sequentially along the rolling direction A. The continuous casting machine 1 can simultaneously produce multi-strand continuous casting billets 9. The continuous casting billet roller table 2 contains multiple conveying roller tables 201, which can simultaneously feed the multi-strand continuous casting billets 9 into the roughing mill 3. The roughing mill 3 contains multiple roughing mills 301, and each roughing mill 301 of the roughing mill 3 can simultaneously roll multi-strand continuous casting billets 9. The intermediate mill 5 contains multiple intermediate mills 501, and each intermediate mill 501 of the intermediate mill 5 can simultaneously roll multi-strand continuous casting billets 9. The first finishing mill 7 contains multiple first finishing mills 701, and each first finishing mill 701 can simultaneously roll multi-strand continuous casting billets 9.

[0019] In this invention, multi-strand continuous casting billets 9 are simultaneously fed into one of the aforementioned bar and wire rod continuous casting and rolling production lines, such as... Figure 1 , Figure 3 As shown, the multi-strand continuous casting billet 9 can be rolled simultaneously (in the prior art, only one strand of the multi-strand continuous casting billet 9 can be rolled, and multiple strands cannot be rolled simultaneously). Thus, the output of one of the aforementioned bar and wire rod continuous casting and rolling production lines is the sum of the outputs of the multi-strand continuous casting lines. This maximizes the production capacity of the rolling mill equipment.

[0020] The continuous casting machine 1 can be configured as a single-unit multi-strand or multiple-unit multi-strand. For example, the continuous casting machine 1 can be a multi-unit multi-strand machine, meaning that multiple continuous casting machines 1 can simultaneously produce multi-strand continuous casting billets 9. There is a one-to-one correspondence between the continuous casting machine 1 and the continuous casting billets 9. The multi-strand continuous casting billets 9 that the continuous casting machine 1 can simultaneously produce correspond one-to-one with multiple conveyor rollers 201. The continuous casting billet rollers 2 contain a spreading section 202, a transition section 203, and a gathering section 204 arranged sequentially along the rolling direction A. The distance between two adjacent conveyor rollers 201 within the gathering section 204 is less than the distance between two adjacent conveyor rollers 201 within the spreading section 202.

[0021] Each roughing mill 301 can simultaneously roll multi-strand continuous casting billets 9. Each roughing mill 301 contains multiple roughing passes 302, which are spaced apart along the extension direction of the rolls of the roughing mill 301. For example, if the rolling direction A is from left to right, the multiple roughing passes 302 are spaced apart along the front-back direction. The multi-strand continuous casting billets 9 produced simultaneously by the continuous casting machine 1 correspond one-to-one with the multiple roughing passes 302 of each roughing mill 301. The multi-strand continuous casting billets 9 produced simultaneously by the continuous casting machine 1 are directly rolled in each roughing mill 301 of the roughing mill group 3 without being sheared.

[0022] Each roughing mill 301 is a horizontal mill. Along the rolling direction A, the multiple roughing mills 301 are, in sequence, the first roughing mill 303, the second roughing mill 304, the third roughing mill 305, the fourth roughing mill 306, the fifth roughing mill 307, and the sixth roughing mill 308.

[0023] For example, three continuous casting machines 1 can simultaneously produce three-strand continuous casting billets 9, and three conveying rollers 201 convey the three-strand continuous casting billets 9 in a one-to-one correspondence. Each roughing mill 301 contains three roughing rolling passes 302 (in the prior art, a roughing mill 301 usually contains only one roughing rolling pass).

[0024] The roughing passes 302 of the first roughing mill 303 are all flat; the roughing passes 302 of the second roughing mill 304 are all square or round; the roughing passes 302 of the third roughing mill 305 are all elliptical; and the roughing passes 302 of the fourth roughing mill 306 are all round (e.g., ...). Figure 2 As shown), the multiple roughing passes 302 of the fifth roughing mill 307 are all elliptical, while the multiple roughing passes 302 of the sixth roughing mill 308 are all circular.

[0025] The rolled piece is twisted 90 degrees after each odd-numbered stand of the rolling mill. For example, the first roughing mill 303, the third roughing mill 305, and the fifth roughing mill 307 all contain a first torsion guide, which can twist the corresponding rolled continuous casting billet 9 by 90 degrees.

[0026] Specifically, after rolling on the rolls of the first roughing mill 303, the first torsion guide of the first roughing mill 303 torsionals the continuously cast billet 9 by 90 degrees. After rolling on the rolls of the third roughing mill 305, the first torsion guide of the third roughing mill 305 torsionals the continuously cast billet 9 by 90 degrees. After rolling on the rolls of the fifth roughing mill 307, the first torsion guide of the fifth roughing mill 307 torsionals the continuously cast billet 9 by 90 degrees. Currently, the steel grades capable of continuous casting and rolling (without requiring heating in a steel rolling furnace for homogenization) are all plain carbon steel. Plain carbon steel has good plasticity, and the torsion guide will not cause defects such as cracks in the product.

[0027] Each intermediate rolling mill 501 can simultaneously roll multi-strand continuous casting billets 9. Each intermediate rolling mill 501 contains multiple intermediate rolling passes 502, which are arranged at intervals along the extension direction of the rolls of the intermediate rolling mill 501. The multi-strand continuous casting billets 9 that the continuous casting machine 1 can simultaneously produce correspond one-to-one with the multiple intermediate rolling passes 502 of each intermediate rolling mill 501. For example, each intermediate rolling mill 501 contains three intermediate rolling passes 502 (in the prior art, an intermediate rolling mill 501 usually contains only one intermediate rolling pass).

[0028] Each intermediate rolling mill 501 is a horizontal rolling mill. Along the rolling direction A, the multiple intermediate rolling mills 501 are, in sequence, the first intermediate rolling mill 503, the second intermediate rolling mill 504, the third intermediate rolling mill 505, the fourth intermediate rolling mill 506, the fifth intermediate rolling mill 507, and the sixth intermediate rolling mill 508.

[0029] The intermediate rolling passes 502 of the first intermediate rolling mill 503 are all elliptical, while the intermediate rolling passes 502 of the second intermediate rolling mill 504 are all circular (e.g., ...). Figure 4 As shown), the multiple intermediate rolling passes 502 of the third intermediate rolling mill 505 are all elliptical, the multiple intermediate rolling passes 502 of the fourth intermediate rolling mill 506 are all circular, the multiple intermediate rolling passes 502 of the fifth intermediate rolling mill 507 are all elliptical, and the multiple intermediate rolling passes 502 of the sixth intermediate rolling mill 508 are all circular.

[0030] The rolled piece is twisted 90 degrees after each odd-numbered stand of the rolling mill. For example, the first intermediate rolling mill 503, the third intermediate rolling mill 505, and the fifth intermediate rolling mill 507 all contain a second torsion guide, which can twist the corresponding rolled continuous casting billet 9 by 90 degrees.

[0031] For example, after rolling on the first intermediate rolling mill 503, the second torsion guide of the first intermediate rolling mill 503 torsionly twists the rolled piece by 90 degrees; after rolling on the third intermediate rolling mill 505, the second torsion guide of the third intermediate rolling mill 505 torsionly twists the rolled piece by 90 degrees; after rolling on the fifth intermediate rolling mill 507, the second torsion guide of the fifth intermediate rolling mill 507 torsionly twists the rolled piece by 90 degrees.

[0032] Each first finishing mill 701 can simultaneously roll multi-strand continuous casting billets 9. Each first finishing mill 701 contains multiple first finishing rolling passes 702, which are arranged at intervals along the extension direction of the rolls of the first finishing mill 701. The multi-strand continuous casting billets 9 that the continuous casting machine 1 can simultaneously produce correspond one-to-one with the multiple first finishing rolling passes 702 of each first finishing mill 701. For example, each first finishing mill 701 contains three first finishing rolling passes 702 (in the prior art, a first finishing mill 701 usually contains only one first finishing rolling pass).

[0033] Each first finishing mill 701 is a horizontal mill. Along the rolling direction A, the multiple first finishing mills 701 are sequentially designated as the first first finishing mill 703 and the second first finishing mill 704. The multiple first finishing passes 702 of the first first finishing mill 703 are all elliptical, while the multiple first finishing passes 702 of the second first finishing mill 704 are all circular (e.g., ...). Figure 5 (As shown). The first finishing mill 703 also includes a third torsion guide, which can twist the rolled continuous casting billet 9 by 90 degrees.

[0034] The continuous casting and rolling production line for bar and wire rod also includes a first flying shear 4 and a second flying shear 6. Along the rolling direction A, the first flying shear 4 is located between the roughing mill 3 and the intermediate mill 5, and the second flying shear 6 is located between the intermediate mill 5 and the first finishing mill 7. Because these stands require torsion, there are no loopers between the roughing mill 3 and the intermediate mill 5, or between the intermediate mill 5 and the first finishing mill 7. Speed ​​level combined control is achieved using a micro-tension adjustment method. Flying shears (i.e., the first flying shear 4 and the second flying shear 6) are installed in the middle of the mill. These flying shears are only activated in emergency situations; normally, they only operate once when steel bites in and then stop.

[0035] The bar and wire rod continuous casting and rolling production line also includes multiple rolling channels 8, all of which are located downstream of the first finishing mill 7. The multiple continuous casting billets 9 that the continuous casting machine 1 can produce simultaneously correspond one-to-one with the multiple rolling channels 8. The multiple continuous casting billets 9 rolled by the first finishing mill 7 enter the multiple rolling channels 8 one-to-one for further rolling. Each rolling channel 8 contains a second finishing mill 801, a high-speed wire rod finishing mill 802, and a sizing mill 803 arranged sequentially along the rolling direction A. The second finishing mill 801 contains a second finishing mill 8011 arranged sequentially along the rolling direction A.

[0036] The mills in roughing mill 3, intermediate mill 5, and first finishing mill 7 are all short-stress mills, and their roll lengths can be made long enough to fully meet the requirements of simultaneous multi-line rolling. The mills in the second finishing mill 801, as well as the high-speed wire rod finishing mill 802 and the reducing sizing mill 803, are cantilever mills that occupy little space and have high rolling speeds. There is no need for simultaneous multi-line rolling, so they can be restored to a multi-line rolling state, which does not occupy too much space and can fully guarantee the final product quality.

[0037] The following describes a method for continuous casting and rolling of bar and wire rods. This method utilizes the aforementioned continuous casting and rolling production line and includes the following steps: Step 1: The continuous casting machine 1 simultaneously produces multi-strand continuous casting billets 9; Step 2: The continuous casting billet roller table 2 simultaneously feeds the multi-strand continuous casting billet 9 into the roughing mill 3; Step 3: Each roughing mill 301 in the roughing mill group 3 simultaneously rolls multi-strand continuous billets 9; Step 4: Each intermediate rolling mill 501 in the intermediate rolling mill group 5 simultaneously rolls multi-flow billets 9; Step 5: Each of the first finishing mills 701 in the first finishing mill group 7 simultaneously rolls the multi-flow casting billet 9.

[0038] Step 6: Roll the multi-flow billet 9 one-to-one in multiple rolling channels 8.

[0039] The following describes the bar and wire rod continuous casting and rolling production method in detail, taking the simultaneous production of three-strand continuous casting billets 9 by continuous casting machine 1 as an example. The bar and wire rod continuous casting and rolling production method includes the following steps in sequence: Step 1: The continuous casting machine 1 simultaneously produces three-strand continuous casting billets 9; Step 2: The three conveying rollers 201 of the continuous casting billet roller table 2 simultaneously feed the three-strand continuous casting billet 9 into the roughing mill 3; Step 3: The six roughing mills 301 in the roughing mill unit 3 simultaneously roll the three-strand continuous casting billet 9, and each roughing mill 301 contains three roughing rolling passes 302. Step 4: The six intermediate rolling mills 501 in the intermediate rolling mill group 5 simultaneously roll the three-strand continuous casting billet 9, and each intermediate rolling mill 501 contains three intermediate rolling passes 502. Step 5: The two first finishing mills 701 in the first finishing mill group 7 simultaneously roll the three-strand continuous casting billet 9. Each first finishing mill 701 contains three first finishing rolling passes 702. Step 6: The three rolling channels 8 roll the three-strand continuous casting billet 9 in a one-to-one correspondence. Each continuous casting billet 9 is rolled sequentially through the second finishing mill 801, the high-speed wire rod finishing mill 802, and the sizing mill 803.

[0040] Taking the commonly used 160 cubic meter continuous casting billet for bar and wire rod as an example, the capacity of the rolling mill production line following each continuous casting line is approximately 70 t / h. The aforementioned continuous casting and rolling production line for bar and wire rod and its production method can greatly improve the utilization rate of the rolling mill equipment in the continuous casting and rolling line. Considering the traditional casting speed, the hourly production capacity of three continuous casting lines can reach 210 t / h. Furthermore, the roughing mill unit 3, intermediate mill unit 5, and first finishing mill unit 7 (a total of 14 mill stands) and two flying shears of the rolling mill are connected using only one set of equipment. This saves equipment and reduces the space required for these machines.

[0041] The above description is merely a specific embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, substitutions of equivalent components, or equivalent changes and modifications made within the scope of protection of the present invention, should still fall within the scope of the present invention. Furthermore, the technical features, technical solutions, and embodiments of the present invention can be freely combined and used.

Claims

1. A continuous casting and rolling production line for bars and wire rods, characterized in that, The continuous casting and rolling production line for bars and wire rods includes a continuous casting machine (1), a continuous casting billet roller table (2), a roughing mill (3), an intermediate mill (5), and a first finishing mill (7) arranged sequentially along the rolling direction. The continuous casting machine (1) can simultaneously produce multi-strand continuous casting billets (9). The continuous casting billet roller table (2) contains multiple conveying roller tables (201), which can simultaneously feed the multi-strand continuous casting billets (9) into the roughing mill (3). The roughing mill (3) contains... There are multiple roughing mills (301), each of the roughing mills (301) in the roughing mill group (3) can simultaneously roll multi-flow continuous casting billets (9), the intermediate mill group (5) contains multiple intermediate mills (501), each of the intermediate mills (501) in the intermediate mill group (5) can simultaneously roll multi-flow continuous casting billets (9), and the first finishing mill group (7) contains multiple first finishing mills (701), each of the first finishing mills (701) can simultaneously roll multi-flow continuous casting billets (9).

2. The bar and wire rod continuous casting and rolling production line according to claim 1, characterized in that, The continuous casting machine (1) can simultaneously produce multi-flow continuous casting billets (9) that correspond one-to-one with multiple conveying rollers (201). The continuous casting billet rollers (2) contain a spreading section (202), a transition section (203), and a gathering section (204) arranged sequentially along the rolling direction.

3. The bar and wire rod continuous casting and rolling production line according to claim 1, characterized in that, Each roughing mill (301) contains multiple roughing roll passes (302), which are arranged at intervals along the extension direction of the rolls of the roughing mill (301). The multi-strand continuous casting billets (9) that the continuous casting machine (1) can produce simultaneously correspond one-to-one with the multiple roughing roll passes (302) of each roughing mill (301).

4. The bar and wire rod continuous casting and rolling production line according to claim 3, characterized in that, Each roughing mill (301) is a horizontal mill. Along the rolling direction, the multiple roughing mills (301) are, in sequence, the first roughing mill (303), the second roughing mill (304), the third roughing mill (305), the fourth roughing mill (306), the fifth roughing mill (307), and the sixth roughing mill (308). The roughing passes (302) of the first roughing mill (303) are all flat, the roughing passes (302) of the second roughing mill (304) are all square or round, the roughing passes (302) of the third roughing mill (305) are all elliptical, the roughing passes (302) of the fourth roughing mill (306) are all round, the roughing passes (302) of the fifth roughing mill (307) are all elliptical, and the roughing passes (302) of the sixth roughing mill (308) are all round. The first roughing mill (303), the third roughing mill (305) and the fifth roughing mill (307) also contain a first torsion guide, which can torsion the corresponding rolled continuous casting billet (9) by 90 degrees.

5. The bar and wire rod continuous casting and rolling production line according to claim 1, characterized in that, Each intermediate rolling mill (501) contains multiple intermediate rolling passes (502), which are arranged at intervals along the extension direction of the rolls of the intermediate rolling mill (501). The multi-strand continuous casting billets (9) that the continuous casting machine (1) can produce simultaneously correspond one-to-one with the multiple intermediate rolling passes (502) of each intermediate rolling mill (501).

6. The bar and wire rod continuous casting and rolling production line according to claim 5, characterized in that, Each intermediate rolling mill (501) is a horizontal rolling mill. Along the rolling direction, the multiple intermediate rolling mills (501) are, in sequence, the first intermediate rolling mill (503), the second intermediate rolling mill (504), the third intermediate rolling mill (505), the fourth intermediate rolling mill (506), the fifth intermediate rolling mill (507), and the sixth intermediate rolling mill (508). The intermediate rolling passes (502) of the first intermediate rolling mill (503) are all elliptical, the intermediate rolling passes (502) of the second intermediate rolling mill (504) are all circular, the intermediate rolling passes (502) of the third intermediate rolling mill (505) are all elliptical, the intermediate rolling passes (502) of the fourth intermediate rolling mill (506) are all circular, the intermediate rolling passes (502) of the fifth intermediate rolling mill (507) are all elliptical, and the intermediate rolling passes (502) of the sixth intermediate rolling mill (508) are all circular. The first intermediate rolling mill (503), the third intermediate rolling mill (505) and the fifth intermediate rolling mill (507) also contain a second torsion guide, which can twist the corresponding rolled continuous casting billet (9) by 90 degrees.

7. The bar and wire rod continuous casting and rolling production line according to claim 1, characterized in that, Each first finishing mill (701) contains multiple first finishing rolling passes (702), which are arranged at intervals along the extension direction of the rolls of the first finishing mill (701). The multi-strand continuous casting billets (9) that the continuous casting machine (1) can produce simultaneously correspond one-to-one with the multiple first finishing rolling passes (702) of each first finishing mill (701). Each first finishing mill (701) is a horizontal mill. Along the rolling direction, multiple first finishing mills (701) are respectively the first first finishing mill (703) and the second first finishing mill (704). The first finishing mill (703) has multiple elliptical first finishing mill passes (702), while the first finishing mill (704) has multiple circular first finishing mill passes (702). The first finishing mill (703) also contains a third torsion guide, which can twist the rolled continuous casting billet (9) by 90 degrees.

8. The bar and wire rod continuous casting and rolling production line according to claim 1, characterized in that, The bar and wire rod continuous casting and rolling production line also includes a first flying shear (4) and a second flying shear (6). Along the rolling direction, the first flying shear (4) is located between the roughing mill (3) and the intermediate mill (5), and the second flying shear (6) is located between the intermediate mill (5) and the first finishing mill (7).

9. The bar and wire rod continuous casting and rolling production line according to claim 1, characterized in that, The bar and wire rod continuous casting and rolling production line also includes multiple rolling channels (8), all of which are located downstream of the first finishing mill (7). The multi-strand continuous casting billets (9) that the continuous casting machine (1) can produce simultaneously correspond one-to-one with the multiple rolling channels (8). Each rolling channel (8) contains a second finishing mill (801), a high-speed wire rod finishing mill (802), and a sizing mill (803) arranged sequentially along the rolling direction.

10. A method for continuous casting and rolling of bar and wire rods, characterized in that, The continuous casting and rolling production method for bars and wire rods adopts the continuous casting and rolling production line for bars and wire rods as described in claim 1, and the continuous casting and rolling production method for bars and wire rods includes the following steps in sequence: Step 1: The continuous casting machine (1) simultaneously produces multi-strand continuous casting billets (9); Step 2: The continuous casting billet roller table (2) simultaneously feeds the multi-strand continuous casting billet (9) into the roughing mill (3); Step 3: Each roughing mill (301) in the roughing mill group (3) simultaneously rolls multi-flow continuous billets (9); Step 4: Each intermediate rolling mill (501) in the intermediate rolling mill group (5) simultaneously rolls multi-flow continuous billets (9); Step 5: Each of the first finishing mills (701) in the first finishing mill group (7) simultaneously rolls multi-flow continuous billets (9).

Images