A multi-specification steel rolling production line and a rolling method thereof

Abstract

This invention provides a multi-specification steel section rolling production line and its rolling method. Along the rolling direction, the multi-specification steel section rolling production line includes a first billet mill (1), a second billet mill (2), a reversible intermediate rolling mill group (3), and an irreversible finishing rolling mill group (4), arranged sequentially. This multi-specification steel section rolling production line and its rolling method can fully utilize the maximum capacity of the rolling mills without increasing the number of rolling mills, producing steel section rolled products ranging from small to extra-large specifications.

Description

Technical Field

[0001] This invention relates to the field of metal rolling technology, specifically to a multi-specification steel rolling production line and a multi-specification steel rolling method. Background Technology

[0002] Sheet piles, as a type of steel used for cofferdams, have seen rapid development in my country in recent years. There are many types of sheet piles, including U-shaped sheet piles, Z-shaped sheet piles, and cap-shaped sheet piles. U-shaped sheet piles have small cross-sectional dimensions, limiting their application. Z-shaped sheet piles require two piles to be used together, functioning similarly to cap-shaped sheet piles. Cap-shaped sheet piles are more efficient, but due to their larger cross-section, ordinary rolling mills often struggle to meet their rolling strength requirements.

[0003] In the production of steel sheet piles, both domestically and internationally, a "1+3" or "1+1+3" reversible rolling method is adopted. This involves one or two reversible billet mills (51) plus three reversible continuous rolling mills (52). The rolled piece needs to be rolled twice in the three reversible continuous rolling mills (52), resulting in a total of six passes. Figure 1 As shown; or a "1+1+7" semi-continuous rolling method, that is, 2 reversible billet mills 51 + 7 continuous rolling mills 53, the 7 continuous rolling mills 53 are arranged together to form a continuous rolling mill, and the workpiece is rolled only once in the 7 continuous rolling mills 53, such as Figure 2 As shown.

[0004] Sheet piles have complex cross-sections. The width of the cap of hot-rolled cap-shaped sheet piles can reach 900mm, and the largest can reach 1400mm. The rolling force generated by the rolling mill is different for producing sheet piles of different sizes. The reduction rate of each pass must also be adjusted according to the different rolling specifications to meet the maximum rolling force limit requirements of the rolling mill equipment.

[0005] In traditional "1+3" or "1+1+3" reversible rolling methods, even with three reversible rolling mills (52) using 2.3-meter roll lengths, only six pass patterns can be arranged. These six pass patterns, being pre-finished or near-finished pass patterns, primarily function to form the sheet pile, with some elongation considered after forming. Therefore, they can only be rolled once per pass, then rolled empty before returning to roll the other three pass patterns. This arrangement limits the number of pass patterns, making it difficult to meet the deformation requirements of large sheet piles. Even if the pass patterns are arranged, the single-pass rolling energy is very high, limiting the production to small U-shaped sheet piles and preventing the production of large Z-shaped or large cap-shaped sheet piles.

[0006] The traditional "1+1+7" semi-continuous rolling method uses seven continuous rolling mills. This revised arrangement is a step further than the "1+1+3" arrangement, eliminating the intermediate passes that require empty passes for return in the three reversible mills, and allowing direct continuous rolling. Due to the continuous arrangement and the use of finished product passes, pre-finished product passes, and near-finished product passes, the primary purpose of these pass types is to shape the special features of the sheet piles. The connections between the pass types are very strong, and each pass type is typically rolled in only one pass. Summary of the Invention

[0007] To meet the needs of rolling steel sections ranging from small to extra-large sizes, this invention provides a multi-specification steel section rolling production line and its rolling method. This multi-specification steel section rolling production line and its rolling method can fully utilize the maximum capacity of the rolling mills without increasing the number of rolling mills, and produce rolled steel section products ranging from small to extra-large sizes.

[0008] The technical solution adopted by this invention to solve its technical problem is:

[0009] A multi-specification steel rolling production line, along the rolling direction, includes a first billet mill, a second billet mill, a reversible intermediate rolling mill group, and an irreversible finishing rolling mill group arranged sequentially.

[0010] A method for rolling multi-specification steel sections, wherein the method employs the aforementioned multi-specification steel section rolling production line, and the method includes the following steps:

[0011] Step 1: Send the rolled piece into the first roughing mill for rolling;

[0012] Step 2: The rolled piece is fed into the second billet mill for rolling;

[0013] Step 3: Feed the rolled piece into a reversible intermediate rolling mill for rolling;

[0014] Step 4: The rolled piece is fed into an irreversible finishing mill for rolling.

[0015] The beneficial effects of this invention are:

[0016] 1. The continuous rolling mill is divided into two groups: a reversible intermediate rolling mill and an irreversible finishing rolling mill. The rolled piece can be rolled in multiple passes in the reversible intermediate rolling mill instead of just one pass. This will distribute the rolling force generated by large-diameter sheet piles across multiple passes, while the bending passes of the sheet piles are concentrated in the last pass of the reversible intermediate rolling mill and the passes of the finishing mill.

[0017] 2. Compared with traditional rolling methods, this method fully utilizes the maximum capacity of rolling mills to produce more specifications (from small to extra-large specifications) without increasing the number of rolling mills. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a schematic diagram of an existing "1+1+3" rolling mill production line for profile steel.

[0020] Figure 2 This is a schematic diagram of an existing "1+1+7" rolling mill production line for profile steel.

[0021] Figure 3 This is a schematic diagram of the multi-specification steel rolling production line described in this invention.

[0022] 1. First roughing mill; 2. Second roughing mill; 3. Reversible intermediate mill; 4. Irreversible finishing mill;

[0023] 31. First reversible intermediate rolling mill; 32. Second reversible intermediate rolling mill; 33. Third reversible intermediate rolling mill;

[0024] 41. First irreversible finishing mill; 42. Second irreversible finishing mill; 43. Third irreversible finishing mill; 44. Fourth irreversible finishing mill;

[0025] 51. Reversible billet rolling mill; 52. Reversible rolling mill; 53. Continuous rolling mill. Detailed Implementation

[0026] 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.

[0027] A multi-specification steel section rolling production line, along the rolling direction A, includes a first billet mill 1, a second billet mill 2, a reversible intermediate rolling mill group 3, and an irreversible finishing rolling mill group 4 arranged sequentially. Figure 3 As shown.

[0028] In this embodiment, two billet mills are used: a first billet mill 1 and a second billet mill 2. Both the first billet mill 1 and the second billet mill 2 are equipped with roughing and elongation passes for large sheet piles. The rolled piece undergoes multi-pass elongation deformation in both the first billet mill 1 and the second billet mill 2. Each billet mill has two or more large-diameter sheet pile passes, and each pass can be rolled in multiple passes.

[0029] In this embodiment, along the rolling direction A, the reversible intermediate rolling mill group 3 may include a first reversible intermediate rolling mill 31, a second reversible intermediate rolling mill 32, and a third reversible intermediate rolling mill 33 arranged sequentially. The first reversible intermediate rolling mill 31 may be a universal reversible intermediate rolling mill or a two-roll reversible intermediate rolling mill (such as a two-roll horizontal rolling mill), the second reversible intermediate rolling mill 32 may be a universal reversible intermediate rolling mill or a two-roll reversible intermediate rolling mill, and the third reversible intermediate rolling mill 33 may be a universal reversible intermediate rolling mill or a two-roll reversible intermediate rolling mill.

[0030] In practical applications, the choice between a universal mill (including a universal reversible intermediate mill and a universal irreversible finishing mill) or a two-roll mill (including a two-roll reversible intermediate mill and a two-roll irreversible finishing mill) can be determined based on the user's final product outline and production pass system. Figure 3 The diagram shows only one typical form. For example, if the user only produces steel sheet piles, they can choose only two-roll mills in both the reversible intermediate mill unit 3 and the irreversible finishing mill unit 4. For example, if the user is considering producing large H-beams, they can choose only universal mills in both the reversible intermediate mill unit 3 and the irreversible finishing mill unit 4.

[0031] The intermediate rolling mill unit adopts a 3-stand reversible arrangement to form reversible intermediate rolling mill unit 3. When producing large-size steel sheet piles, reversible intermediate rolling mill unit 3 can arrange a total of 6 pass patterns, that is, each stand of the first reversible intermediate rolling mill 31, the second reversible intermediate rolling mill 32, and the third reversible intermediate rolling mill 33 has 2 pass patterns. Among them, 3 pass patterns can be designed to be rolled in multiple passes per extension, or designed to be rolled in only 1 pass (rolled, then returned to roll the other 3 pass patterns). The other 3 pass patterns are designed to be rolled in only 1 pass. If producing small-size steel sheet piles, the intermediate rolling mill unit 3 can also be arranged with only 3 pass patterns, with each stand of the first reversible intermediate rolling mill 31, the second reversible intermediate rolling mill 32, and the third reversible intermediate rolling mill 33 having only 1 pass pattern.

[0032] When each stand of the first reversible intermediate mill 31, the second reversible intermediate mill 32, and the third reversible intermediate mill 33 has two passes, three of the passes are the first pass of the first reversible intermediate mill 31, the first pass of the second reversible intermediate mill 32, and the first pass of the third reversible intermediate mill 33, and the other three passes are the second pass of the first reversible intermediate mill 31, the second pass of the second reversible intermediate mill 32, and the second pass of the third reversible intermediate mill 33.

[0033] In this embodiment, along the rolling direction A, the irreversible finishing mill 4 may include a first irreversible finishing mill 41, a second irreversible finishing mill 42, a third irreversible finishing mill 43, and a fourth irreversible finishing mill 44 arranged sequentially. The first irreversible finishing mill 41 can be a universal irreversible finishing mill or a two-roll irreversible finishing mill (such as a two-roll horizontal mill), the second irreversible finishing mill 42 can be a universal irreversible finishing mill or a two-roll irreversible finishing mill, the third irreversible finishing mill 43 can be a universal irreversible finishing mill or a two-roll irreversible finishing mill, and the fourth irreversible finishing mill 44 can be a universal irreversible finishing mill or a two-roll irreversible finishing mill. The finishing mill adopts a 4-stand irreversible arrangement, and the rolled workpiece undergoes sheet pile bending and final forming in the finishing mill.

[0034] The following describes a method for rolling multi-specification steel sections. This method utilizes the aforementioned multi-specification steel section rolling production line and includes the following steps:

[0035] Step 1: Feed the rolled piece into the first roughing mill 1 and roll it in one or more passes;

[0036] Step 2: The rolled piece is fed into the second billet mill 2 for rolling one or more passes;

[0037] Step 3: The rolled piece is fed into the reversible intermediate rolling mill 3 for rolling;

[0038] Step 4: The rolled piece is fed into the irreversible finishing mill 4 for one pass to complete the final rolling deformation.

[0039] When rolling small-sized pieces (width less than 600mm, ordinary U-shaped steel sheet piles), the first reversible intermediate rolling mill 31, the second reversible intermediate rolling mill 32, and the third reversible intermediate rolling mill 33 can have only one pass. In step 3, the piece is rolled in the first reversible intermediate rolling mill 31, the second reversible intermediate rolling mill 32, and the third reversible intermediate rolling mill 33 for one pass, that is, the first reversible intermediate rolling mill 31, the second reversible intermediate rolling mill 32, and the third reversible intermediate rolling mill 33 roll the piece in sequence.

[0040] When rolling large-sized pieces (such as cap-shaped steel sheet piles with a width of 900 mm), the first reversible intermediate rolling mill 31, the second reversible intermediate rolling mill 32, and the third reversible intermediate rolling mill 33 each contain two passes. Step 3 includes the following steps:

[0041] Step 3.1a: Roll the workpiece sequentially through the first pass of the first reversible intermediate rolling mill 31, the first pass of the second reversible intermediate rolling mill 32, and the first pass of the third reversible intermediate rolling mill 33 for one pass, that is, the workpiece sequentially passes through the first pass of the first reversible intermediate rolling mill 31, the first pass of the second reversible intermediate rolling mill 32, and the first pass of the third reversible intermediate rolling mill 33, and the first reversible intermediate rolling mill 31, the second reversible intermediate rolling mill 32, and the third reversible intermediate rolling mill 33 all perform rolling operations;

[0042] Step 3.2a: The rolled piece passes through the third reversible intermediate rolling mill 33, the second reversible intermediate rolling mill 32 and the first reversible intermediate rolling mill 31 in sequence and returns empty. That is, the rolled piece passes through the third reversible intermediate rolling mill 33, the second reversible intermediate rolling mill 32 and the first reversible intermediate rolling mill 31 in sequence and returns empty. None of the third reversible intermediate rolling mill 33, the second reversible intermediate rolling mill 32 and the first reversible intermediate rolling mill 31 performs rolling work.

[0043] Step 3.3a: The workpiece is rolled in the second pass of the first reversible intermediate rolling mill 31, the second pass of the second reversible intermediate rolling mill 32, and the second pass of the third reversible intermediate rolling mill 33 in sequence for one pass. That is, the workpiece passes through the second pass of the first reversible intermediate rolling mill 31, the second pass of the second reversible intermediate rolling mill 32, and the second pass of the third reversible intermediate rolling mill 33 in sequence. The first reversible intermediate rolling mill 31, the second reversible intermediate rolling mill 32, and the third reversible intermediate rolling mill 33 all perform rolling operations.

[0044] When rolling extra-large dimensions (such as cap-shaped steel sheet piles with a width of 1400mm), the first reversible intermediate rolling mill 31, the second reversible intermediate rolling mill 32, and the third reversible intermediate rolling mill 33 can also perform individual reversible rolling, that is, step 3 includes the following steps:

[0045] Step 3.1b: Roll the workpiece in the first reversible intermediate mill 31 for multiple passes (the specific number of passes can be flexibly adjusted according to the production specifications), and pass the workpiece through the second reversible intermediate mill 32 and the third reversible intermediate mill 33 without passing through.

[0046] Step 3.2b: Roll the workpiece in the second reversible intermediate mill 32 for multiple passes (the specific number of passes can be flexibly adjusted according to the production specifications), and pass the workpiece through the first reversible intermediate mill 31 and the third reversible intermediate mill 33 without passing through.

[0047] Step 3.3b: Roll the workpiece in the third reversible intermediate mill 33 for multiple passes (the specific number of passes can be flexibly adjusted according to the production specifications), and pass the workpiece through the first reversible intermediate mill 31 and the second reversible intermediate mill 32 without passing through.

[0048] Step 3.4b: Roll the workpiece in the first reversible intermediate mill 31, the second reversible intermediate mill 32 and the third reversible intermediate mill 33 for one pass.

[0049] In this embodiment, along the rolling direction A, the irreversible finishing mill 4 may contain a first irreversible finishing mill 41, a second irreversible finishing mill 42, a third irreversible finishing mill 43, and a fourth irreversible finishing mill 44 arranged sequentially. Alternatively, the irreversible finishing mill 4 may contain only the first irreversible finishing mill 41, the second irreversible finishing mill 42, and the third irreversible finishing mill 43 arranged sequentially. All mills used in this invention can be existing technology products.

[0050] 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, any substitution of equivalent components or equivalent changes and modifications made within the scope of protection of this patent should still fall within the scope of this patent. Furthermore, the technical features, technical features and technical solutions, and technical solutions in this invention can be freely combined and used.

Claims

1. A method of rolling a multi-specification steel, characterized by, The multi-specification steel rolling method employs a multi-specification steel rolling production line, which includes a first billet mill (1), a second billet mill (2), a reversible intermediate mill group (3), and an irreversible finishing mill group (4) arranged sequentially along the rolling direction; the reversible intermediate mill group (3) includes a first reversible intermediate mill (31), a second reversible intermediate mill (32), and a third reversible intermediate mill (33) arranged sequentially along the rolling direction. The method for rolling multi-specification steel sections includes the following steps: Step 1: Send the rolled piece into the first roughing mill (1) for rolling; Step 2: The rolled piece is fed into the second billet mill (2) for rolling; Step 3: The rolled piece is fed into the reversible intermediate rolling mill (3) for rolling; Step 4: The rolled piece is fed into the irreversible finishing mill (4) for rolling; When rolling small-sized pieces, in step 3, the pieces are rolled in one pass in the first reversible intermediate mill (31), the second reversible intermediate mill (32), and the third reversible intermediate mill (33); When rolling large-diameter workpieces, the first reversible intermediate mill (31), the second reversible intermediate mill (32), and the third reversible intermediate mill (33) each contain two pass profiles. Step 3 includes the following steps: Step 3.1a: Roll the workpiece in the first pass of the first reversible intermediate mill (31), the first pass of the second reversible intermediate mill (32), and the first pass of the third reversible intermediate mill (33) for one pass; Step 3.2a: The rolled piece passes through the third reversible intermediate mill (33), the second reversible intermediate mill (32) and the first reversible intermediate mill (31) in sequence and returns empty; Step 3.3a: Roll the workpiece in the second pass of the first reversible intermediate mill (31), the second pass of the second reversible intermediate mill (32), and the second pass of the third reversible intermediate mill (33) for one pass; When rolling extra-large gauge pieces, step 3 includes the following steps: Step 3.1b: The workpiece is rolled in a first reversible intermediate mill (31) for multiple passes, and the workpiece is passed through a second reversible intermediate mill (32) and a third reversible intermediate mill (33) without passing through. Step 3.2b: Roll the workpiece in the second reversible intermediate mill (32) for multiple passes, and pass the workpiece through the first reversible intermediate mill (31) and the third reversible intermediate mill (33); Step 3.3b: Roll the workpiece in the third reversible intermediate mill (33) for multiple passes, while passing the workpiece through the first reversible intermediate mill (31) and the second reversible intermediate mill (32); Step 3.4b: Roll the workpiece in the first reversible intermediate mill (31), the second reversible intermediate mill (32) and the third reversible intermediate mill (33) for one pass.

2. The method for rolling multi-specification steel sections according to claim 1, characterized in that, The first reversible intermediate mill (31) is a universal reversible intermediate mill or a two-roll reversible intermediate mill, the second reversible intermediate mill (32) is a universal reversible intermediate mill or a two-roll reversible intermediate mill, and the third reversible intermediate mill (33) is a universal reversible intermediate mill or a two-roll reversible intermediate mill.

3. The method for rolling multi-specification steel sections according to claim 1, characterized in that, Along the rolling direction, the irreversible finishing mill (4) includes a first irreversible finishing mill (41), a second irreversible finishing mill (42), a third irreversible finishing mill (43), and a fourth irreversible finishing mill (44) arranged in sequence.

4. The method for rolling multi-specification steel sections according to claim 3, characterized in that, The first irreversible finishing mill (41) is a universal irreversible finishing mill or a two-roll irreversible finishing mill; the second irreversible finishing mill (42) is a universal irreversible finishing mill or a two-roll irreversible finishing mill; the third irreversible finishing mill (43) is a universal irreversible finishing mill or a two-roll irreversible finishing mill; and the fourth irreversible finishing mill (44) is a universal irreversible finishing mill or a two-roll irreversible finishing mill.

5. The method for rolling multi-specification steel sections according to claim 1, characterized in that, Along the rolling direction, the irreversible finishing mill (4) includes a first irreversible finishing mill (41), a second irreversible finishing mill (42) and a third irreversible finishing mill (43) arranged in sequence.

6. The method for rolling multi-specification steel sections according to claim 5, characterized in that, The first irreversible finishing mill (41) is a universal irreversible finishing mill or a two-roll irreversible finishing mill, the second irreversible finishing mill (42) is a universal irreversible finishing mill or a two-roll irreversible finishing mill, and the third irreversible finishing mill (43) is a universal irreversible finishing mill or a two-roll irreversible finishing mill.

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