A finishing mill structure for controlling flange deformation of hot-rolled H-beam after rapid cooling

Abstract

The present invention belongs to the technical field of steel rolling and is a finishing mill structure for controlling flange deformation of hot-rolled H-shaped steel after rapid cooling. An upper horizontal roller (1) includes an upper horizontal roller rolling end (2), and the slope of an upper horizontal roller side working surface (3) of the upper horizontal roller rolling end (2) and a vertical line (4) is in the range of 0.7° to 2.5°; a lower horizontal roller (5) includes a lower horizontal roller rolling end (6), and the slope of a lower horizontal roller side working surface (7) of the lower horizontal roller rolling end (6) and a vertical line (4) is in the range of 0.7° to 2.5°. The finishing mill structure for controlling flange deformation of hot-rolled H-shaped steel after rapid cooling according to the present invention can produce hot-rolled H-shaped steel with no obvious deformation of the flange after water penetration under large-scale production conditions, thereby meeting the external dimension requirements of high-strength hot-rolled H-shaped steel.

Description

Technical Field

[0001] The invention belongs to the technical field of steel rolling, and more particularly relates to a finishing mill structure for controlling flange deformation of hot-rolled H-shaped steel during rapid cooling after rolling. Background Art

[0002] The application areas of H-shaped steel are constantly expanding, and have expanded from the steel structure industry to the machinery industry, special railway vehicles, offshore oil platforms and other fields. As low-carbon emission reduction becomes the mainstream of the steel industry, the use of high-strength steel is becoming more and more common. In the production process of H-shaped steel, due to the limitations of carbon equivalent and billet shape, it is difficult to achieve high strength requirements from the perspective of alloy design alone. It is necessary to combine controlled rolling and controlled cooling processes. There are many international and domestic standards for H-shaped steel, and the specification span is large. In order to achieve high strength, some specifications have serious flange deformation after water penetration and cannot be straightened by a straightener. From an economic perspective, changing from special-shaped billets to slabs can solve the problem caused by insufficient compression ratio, but the investment increases significantly. Therefore, there is an urgent need to find a rolling mill structure and method to control the deformation of the flange of hot-rolled H-shaped steel after water penetration to meet the application needs of producing high-strength steel series with different specifications.

[0003] (1) The application with announcement number CN218881330U and titled “High-strength and anti-deformation welded H-beam” mainly uses tungsten alloy as the material of the reinforcement layer. Tungsten alloy has the advantages of high density, good machinability and high strength, thereby improving the internal strength of the welded H-beam. The main material of the buffer layer is beryllium copper alloy, which has high elasticity and fatigue resistance. At the same time, the honeycomb structure ensures the overall strength of the welded H-beam and increases the load-bearing capacity of the welded H-beam, preventing the welded H-beam from deforming and breaking due to long-term load-bearing.

[0004] (2) The invention patent with the announcement number CN117988442A and the name “An H-beam anti-deformation device and method thereof” discloses an H-beam anti-deformation device and method thereof. The patent mainly uses a movable bracket, a supporting bracket and a wedge-shaped bracket to reinforce the flange at the H-beam node, which can effectively prevent the H-beam flange from deformation and increase the load-bearing capacity of the H-beam; the total length of the movable bracket and the supporting bracket can be conveniently adjusted through the pushing mechanism, so that the movable bracket and the supporting bracket can be connected to the flange at the H-beam node respectively, which is convenient to operate.

[0005] In the above-mentioned patent document 1, welding H-shaped steel and deformation correction equipment are mainly introduced. In patent document 2, the focus is on the use of mobile support brackets to prevent deformation of H-shaped steel after production in actual use; therefore, this technology does not involve the technical problems and technical solutions of this application. Summary of the Invention

[0006] The technical problem to be solved by the present invention is: in view of the shortcomings of the existing technology, a finishing mill structure with a simple structure is provided to produce hot-rolled H-shaped steel without obvious deformation of the flange after passing through water under large-scale production conditions, so as to meet the external dimension requirements of high-strength hot-rolled H-shaped steel and control the deformation of the flange of the hot-rolled H-shaped steel after rapid cooling after rolling.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0008] The present invention relates to a finishing mill structure for controlling flange deformation of hot-rolled H-shaped steel after rapid cooling. The upper horizontal roll comprises an upper horizontal roll rolling end, and the inclination of the upper horizontal roll side working surface of the upper horizontal roll rolling end to the vertical line is in the range of 0.7° to 2.5°; the lower horizontal roll comprises a lower horizontal roll rolling end, and the inclination of the lower horizontal roll side working surface of the lower horizontal roll rolling end to the vertical line is in the range of 0.7° to 2.5°; the vertical roll comprises a vertical roll rolling end, and the inclination of the vertical roll end working surface of the vertical roll rolling end to the vertical line is in the range of 0.7° to 2.5°.

[0009] The vertical rollers include a first vertical roller and a second vertical roller. The inclination of the vertical roller end working surface at the vertical roller rolling end of the first vertical roller and the vertical line is in the range of 0.7° to 2.5°. The inclination of the vertical roller end working surface at the vertical roller rolling end of the second vertical roller and the vertical line is in the range of 0.7° to 2.5°.

[0010] The first vertical roller and the second vertical roller are arranged symmetrically, the first vertical roller is arranged on one side of the upper horizontal roller side working surface on the left side of the upper horizontal roller rolling end and the lower horizontal roller side working surface on the left side of the lower horizontal roller rolling end, and the second vertical roller is arranged on the other side of the upper horizontal roller side working surface on the right side of the upper horizontal roller rolling end and the lower horizontal roller side working surface on the right side of the lower horizontal roller rolling end.

[0011] The inclination of the upper horizontal roller side working surface of the upper horizontal roller rolling end and the horizontal line is in the range of 87.5° to 89.3°; the inclination of the lower horizontal roller side working surface of the lower horizontal roller rolling end and the horizontal line is in the range of 87.5° to 89.3°.

[0012] The slope of the lower horizontal roller side working surface at the vertical roller rolling end of the first vertical roller and the horizontal line is in the range of 87.5° to 89.3°, and the slope of the lower horizontal roller side working surface at the vertical roller rolling end of the second vertical roller and the horizontal line is in the range of 87.5° to 89.3°.

[0013] The cross-section of the side working surface of the vertical roller at the rolling end of the first vertical roller is a convex V-shaped structure, and the most convex point is located at the center line of the vertical roller; the cross-section of the side working surface of the vertical roller at the rolling end of the second vertical roller is a convex V-shaped structure, and the most convex point is located at the center line of the vertical roller.

[0014] As Example 1, when rolling hot-rolled H-shaped steel of specifications 630×200×15×20, the inclination of the upper horizontal roll side working surface of the upper horizontal roll rolling end of the upper horizontal roll and the horizontal line is 89.3°; the inclination of the lower horizontal roll side working surface of the lower horizontal roll rolling end of the lower horizontal roll and the horizontal line is in the range of 89.3°; the inclination of the lower horizontal roll side working surface of the vertical roll rolling end of the first vertical roll and the horizontal line is 89.3°, and the inclination of the vertical roll side working surface of the vertical roll rolling end of the second vertical roll is 89.3°. The slope of the side working surface of the lower horizontal roller and the horizontal line is 89.3°; the continuous casting special-shaped billets are heated to 1200℃-1280℃ in a heating furnace, and the surface oxide scale is removed by a descaling machine. The billets enter the billet opening machine and are rolled back and forth 9-15 times in different pass types. The rolled pieces enter the universal roughing mill and are rolled back and forth 1-9 times. The H-shaped steel is rolled in the finishing mill for the last pass; after leaving the finishing mill, water is passed through the water pipe, with the side baffle opening of 1130mm, 1-10 groups of water nozzles, and the water pressure of 1.2 MPa-1.5MPa. After water passing, the product flanges are not deformed and the flange inclination meets the standard requirements.

[0015] As Example 2, when rolling hot-rolled H-shaped steel of specifications 630×200×15×20, the inclination of the upper horizontal roll side working surface of the upper horizontal roll rolling end 2 of the upper horizontal roll and the horizontal line is 87.5°; the inclination of the lower horizontal roll side working surface of the lower horizontal roll rolling end of the lower horizontal roll and the horizontal line is in the range of 87.5°; the inclination of the lower horizontal roll side working surface of the vertical roll rolling end of the first vertical roll and the horizontal line is 87.5°, and the inclination of the lower horizontal roll side working surface of the vertical roll rolling end of the second vertical roll and the horizontal line is 87.5°. The slope of the side working surface 10 of the lower horizontal roller at the rolling end of the vertical roller and the horizontal line 13 is 87.5°; the continuous casting special-shaped billet is heated to 1200℃-1280℃ in a heating furnace, and the surface oxide scale is removed by a descaling machine. It enters the billet opening machine and is rolled back and forth in 9-15 passes of different pass types. The rolled piece enters the universal roughing mill and is rolled back and forth in 1-9 passes. The H-shaped steel is rolled in the finishing mill for the last pass, and is water-pierced after leaving the finishing mill. The opening of the side baffle is 1100 mm-1140 mm, the number of water nozzles is 1-10 groups, and the water pressure is 1.2 MPa-1.5 MPa. After water penetration, the product flange has no deformation and the flange inclination meets the standard requirements.

[0016] As Example 3, when rolling hot-rolled H-shaped steel of specification 488×300×11×18, the slope of the upper horizontal roller side working surface of the upper horizontal roller rolling end of the upper horizontal roller and the horizontal line is 88.6°; the slope of the lower horizontal roller side working surface of the lower horizontal roller rolling end of the lower horizontal roller and the horizontal line is in the range of 88.6°; the slope of the lower horizontal roller side working surface of the vertical roller rolling end of the first vertical roller and the horizontal line is 88.6°, and the slope of the lower horizontal roller side working surface of the vertical roller rolling end of the second vertical roller and the horizontal line is 88.6°; the continuous casting special-shaped billet is heated to 1200℃-1280℃ in a heating furnace, and the scale remover removes the surface oxide scale, enters the blanking machine and is rolled back and forth in 9-15 passes of different pass types, and the rolled piece enters the universal roughing mill for 1-7 passes and is rolled back and forth, and the H-shaped steel is rolled in the finishing mill for the last pass; after leaving the finishing mill, it is water-pierced, and the opening degree of the side baffle is 990 mm-1030mm, number of water nozzles 1-8 groups, water pressure 1.2 MPa -1.5 MPa, the product flange has no deformation after water penetration, and the flange inclination meets the standard requirements.

[0017] As Example 4, when rolling hot-rolled H-shaped steel of specification 305×305×223, the slope of the upper horizontal roller side working surface of the upper horizontal roller rolling end of the upper horizontal roller and the horizontal line is 88.2°; the slope of the lower horizontal roller side working surface of the lower horizontal roller rolling end of the lower horizontal roller and the horizontal line is in the range of 88.2°; the slope of the lower horizontal roller side working surface of the vertical roller rolling end of the first vertical roller and the horizontal line is 88.2°, and the slope of the lower horizontal roller side working surface of the vertical roller rolling end of the second vertical roller and the horizontal line 13 is 88.2°; the continuous casting special-shaped billet is heated to 1200℃-1280℃ in a heating furnace, and the surface oxide scale is removed by a descaling machine. The billet enters the cogging mill and is rolled back and forth in 9-15 passes of different pass types. The rolled piece enters the universal roughing mill and is rolled back and forth in 1-7 passes. The H-shaped steel is rolled in the finishing mill for the last pass; after exiting the finishing mill, it is water-pierced, and the side baffle opening is 900 mm -960mm, number of water nozzles 1-21 groups, water pressure 1.2 MPa-1.5 MPa, the product flange has no deformation after water penetration, and the flange inclination meets the standard requirements.

[0018] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows:

[0019] The present invention discloses a finishing mill structure for controlling flange deformation during rapid cooling of hot-rolled H-shaped steel after rolling. The mill's local structure is modified during structural design. Specifically, the upper horizontal roll, lower horizontal roll, and vertical roll structures are modified so that the side working surface of the upper horizontal roll at the rolling end of the upper horizontal roll forms an inclination within a specific range with respect to the vertical line; the side working surface of the lower horizontal roll at the rolling end of the lower horizontal roll forms an inclination within a specific range with respect to the vertical line; and the end working surface of the vertical roll at the rolling end of the vertical roll forms an inclination within a specific range with respect to the vertical line. Thus, during the rolling process of H-shaped steel of different specifications, the heating temperature of the continuously cast profiled blank is controlled after passing through the heating furnace, the surface oxide scale is removed by the descaling machine, the blank enters the slab mill for reciprocating rolling, the rolled product enters the roughing mill for reciprocating rolling, the H-shaped steel is then rolled in the finishing mill for the final pass, and after exiting the mill, water is pierced. The side baffle opening, the number of water nozzles, and the water pressure are controlled to improve the quality of the rolled product. After water piercing, the flange of the product is free of deformation, and the flange inclination meets standard requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following is a brief description of the contents and symbols in the drawings of this specification:

[0021] Figure 1 This is a schematic structural diagram of a finishing mill structure for controlling flange deformation of hot-rolled H-shaped steel after rapid cooling after rolling according to the present invention;

[0022] The markings in the accompanying drawings are: 1. upper horizontal roller; 2. rolling end of upper horizontal roller; 3. side working surface of upper horizontal roller; 4. vertical line; 5. lower horizontal roller; 6. rolling end of lower horizontal roller; 7. side working surface of lower horizontal roller; 8. vertical roller; 9. rolling end of vertical roller; 10. end working surface of vertical roller; 11. first vertical roller; 12. second vertical roller; 13. horizontal line; 14. center line of vertical roller. DETAILED DESCRIPTION

[0023] The following describes the embodiments with reference to the accompanying drawings to further explain in detail the specific embodiments of the present invention, such as the shapes, structures, mutual positions and connection relationships between the various components involved, the functions and working principles of the various components.

[0024] As attached Figure 1As shown, the present invention provides a finishing mill structure for controlling flange deformation during rapid cooling of hot-rolled H-beam after rolling. The upper horizontal roll 1 includes an upper horizontal roll rolling end 2, with the upper horizontal roll side working surface 3 of the upper horizontal roll rolling end 2 having an inclination with a vertical line 4 ranging from 0.7° to 2.5°. The lower horizontal roll 5 includes a lower horizontal roll rolling end 6, with the lower horizontal roll side working surface 7 of the lower horizontal roll rolling end 6 having an inclination with a vertical line 4 ranging from 0.7° to 2.5°. The vertical roll 8 includes a vertical roll rolling end 9, with the vertical roll end working surface 10 of the vertical roll rolling end 9 having an inclination with a vertical line 4 ranging from 0.7° to 2.5°. This structure addresses the shortcomings of the prior art and provides an improved technical solution. During the structural setup, improvements were made to the local structure of the finishing mill. Specifically, the structures of the upper horizontal roll 1, lower horizontal roll 5, and vertical roll 8 were improved so that the upper horizontal roll side working surface 3 at the rolling end 2 of the upper horizontal roll forms an inclination within a specific range with the vertical line 4; the lower horizontal roll side working surface 7 at the rolling end 6 of the lower horizontal roll forms an inclination within a specific range with the vertical line 4; and the vertical roll end working surface 10 at the rolling end 9 of the vertical roll forms an inclination within a specific range with the vertical line 4. In this way, during the rolling process of H-beams of different specifications, the heating temperature of the continuously cast profiled blanks passing through the heating furnace is controlled, the surface oxide scale is removed by the descaling machine, the blanks enter the slab mill for reciprocating rolling, the rolled pieces enter the roughing mill for reciprocating rolling, and the H-beams are rolled in the finishing mill for the final pass. After exiting the finishing mill, water is passed through the finishing mill. The side baffle opening, the number of water nozzles, and the water pressure are controlled to improve the quality of the rolled products. After water passing, the flanges of the products are free of deformation and the flange inclination meets the standard requirements. The finishing mill structure for controlling flange deformation of hot-rolled H-shaped steel after rapid cooling after rolling, as described in the present invention, has a simple structure and can produce hot-rolled H-shaped steel without obvious deformation of the flange after passing through water under large-scale production conditions, thereby meeting the external dimension requirements of high-strength hot-rolled H-shaped steel. H-shaped steel is in an "H" shape during rolling and is rapidly cooled after being rolled by the finishing mill. Since the outer side of the flange is in direct contact with the rapid cooling medium, the cooling rate is greater than that of the inner side of the flange. After cooling, the flange will deform inwardly. By modifying the inclination of the finishing mill rolls, the flange of the rolled piece exiting the finishing mill is slightly tilted inwardly to the outer side of the flange at a certain angle to the vertical line. After rapid cooling, the deformation of the flange inwardly and the initial outward tilt are exactly offset by each other, thereby meeting the requirement of producing hot-rolled H-shaped steel without obvious deformation of the flange after passing through water under large-scale production conditions.

[0025] The vertical rollers 8 include a first vertical roller 11 and a second vertical roller 12. The slope of the vertical roller end working surface 10 of the vertical roller rolling end 9 of the first vertical roller 11 to the vertical line 4 is in the range of 0.7° to 2.5°, and the slope of the vertical roller end working surface 10 of the vertical roller rolling end 9 of the second vertical roller 12 to the vertical line 4 is in the range of 0.7° to 2.5°. The first vertical rollers 11 and the second vertical rollers 12 are symmetrically arranged. The first vertical roller 11 is arranged on one side of the upper horizontal roller side working surface 3 on the left side of the upper horizontal roller rolling end 2 and the lower horizontal roller side working surface 7 on the left side of the lower horizontal roller rolling end 6, and the second vertical roller 12 is arranged on the other side of the upper horizontal roller side working surface 3 on the right side of the upper horizontal roller rolling end 2 and the lower horizontal roller side working surface 7 on the right side of the lower horizontal roller rolling end 6. In the above structure, the upper horizontal roll 1 is located directly above the lower horizontal roll 5, a first vertical roll 11 is provided on the left side of the upper horizontal roll 1 and the lower horizontal roll 5, a second vertical roll 12 is provided on the right side of the upper horizontal roll 1 and the lower horizontal roll 5, the first vertical roll 11 and the second vertical roll 12 are both arranged horizontally, the upper horizontal roll 1, the lower horizontal roll 5, the first vertical roll 11, and the second vertical roll 12 cooperate to complete the finish rolling of the H-beam, and after finish rolling and water penetration, the flange of the H-beam product has no deformation, and the inclination of the H-beam flange meets the standard requirements.

[0026] The upper horizontal roll side working surface 3 of the upper horizontal roll rolling end 2 of the upper horizontal roll 1 has an inclination of 87.5° to 89.3° with respect to the horizontal line 13; the lower horizontal roll side working surface 7 of the lower horizontal roll rolling end 6 of the lower horizontal roll 5 has an inclination of 87.5° to 89.3° with respect to the horizontal line 13. The lower horizontal roll side working surface 10 of the vertical roll rolling end 9 of the first vertical roll 11 has an inclination of 87.5° to 89.3° with respect to the horizontal line 13; and the lower horizontal roll side working surface 10 of the vertical roll rolling end 9 of the second vertical roll 12 has an inclination of 87.5° to 89.3° with respect to the horizontal line 13. The above structure defines the structure of the upper horizontal roll 1, the lower horizontal roll 5, the first vertical roll 11, and the second vertical roll 12, meeting the requirements for improving product quality.

[0027] The cross section of the side working surface 10 of the vertical roll rolling end 9 of the first vertical roll 11 is a convex V-shaped structure, and the most convex point is located at the center line 14 of the vertical roll; the cross section of the side working surface 10 of the vertical roll rolling end 9 of the second vertical roll 12 is a convex V-shaped structure, and the most convex point is located at the center line 14 of the vertical roll.

[0028] As Example 1, when rolling hot-rolled H-shaped steel of specifications 630×200×15×20, the inclination of the upper horizontal roll side working surface 3 of the upper horizontal roll rolling end 2 of the upper horizontal roll 1 and the horizontal line 13 is 89.3°; the inclination of the lower horizontal roll side working surface 7 of the lower horizontal roll rolling end 6 of the lower horizontal roll 5 and the horizontal line 13 is 89.3°; the inclination of the lower vertical roll end working surface 10 of the vertical roll rolling end 9 of the first vertical roll 11 and the horizontal line 13 is 89.3°, and the inclination of the second vertical roll 12 is 89.3°. The working surface 10 of the vertical roller rolling end 9 has an inclination of 89.3° to the horizontal line 13. The continuously cast irregularly shaped billets are heated in a heating furnace to 1200°C-1280°C. A descaling mill removes surface scale before entering the slab mill for 9-15 reciprocating passes of varying pass profiles. The rolled pieces then enter the universal roughing mill for 1-9 reciprocating passes, and the H-beams undergo a final pass in the finishing mill. After exiting the finishing mill, water is pumped in, with side baffles opening 1130mm, 1-10 water nozzles, and a water pressure of 1.2 MPa-1.5 MPa. After water pumping, the product flanges exhibit no deformation, and the flange inclination meets standard requirements. This structure allows for specific inclination settings within a set range for hot-rolled H-beams of varying specifications, further improving product rolling quality and effectively preventing deformation.

[0029] As Example 2, when rolling hot-rolled H-shaped steel of 630×200×15×20 specifications, the slope of the upper horizontal roll side working surface 3 of the upper horizontal roll rolling end 2 of the upper horizontal roll 1 and the horizontal line 13 is 87.5°; the slope of the lower horizontal roll side working surface 7 of the lower horizontal roll rolling end 6 of the lower horizontal roll 5 and the horizontal line 13 is 87.5°; the slope of the vertical roll end working surface 10 of the vertical roll rolling end 9 of the first vertical roll 11 and the horizontal line 13 is 87.5°. The slope of the working surface 10 of the vertical roller end 9 of the second vertical roller 12 to the horizontal line 13 is 87.5°; the continuous cast special-shaped billet is heated to 1200℃-1280℃ in a heating furnace, and the surface oxide scale is removed by a descaling machine. The billet enters the cogging mill and is rolled back and forth in 9-15 passes of different pass types. The rolled piece enters the universal roughing mill and is rolled back and forth in 1-9 passes. The H-beam is rolled in the finishing mill for the last pass. After exiting the finishing mill, it is water-pierced. The side baffle opening is 1100mm-1140mm, the number of water nozzles is 1-10 groups, and the water pressure is 1.2MPa-1.5MPa. After water-piercing, the product flange is not deformed and the flange slope meets the standard requirements. The above structure can set the slope data for hot-rolled H-beams of different specifications within the set range, thereby further improving the rolling quality of the product and effectively avoiding deformation.

[0030] As Example 3, when rolling hot-rolled H-shaped steel of size 488×300×11×18, the slope of the upper horizontal roll side working surface 3 of the upper horizontal roll rolling end 2 of the upper horizontal roll 1 and the horizontal line 13 is 88.6°; the slope of the lower horizontal roll side working surface 7 of the lower horizontal roll rolling end 6 of the lower horizontal roll 5 and the horizontal line 13 is 88.6°; the slope of the vertical roll end working surface 10 of the vertical roll rolling end 9 of the first vertical roll 11 and the horizontal line 13 is 88.6°. The working surface 10 of the vertical roller end 9 of the second vertical roller 12 is inclined at 88.6° to the horizontal line 13. The continuously cast beam blank is heated in a heating furnace to 1200°C-1280°C. A descaling mill removes surface scale before entering the slab mill for 9-15 reciprocating passes of varying pass profiles. The rolled piece then enters the universal roughing mill for 1-7 reciprocating passes, and the H-beam undergoes a final pass in the finishing mill. After exiting the finishing mill, water is pumped in, with side baffle openings ranging from 990 mm to 1030 mm, 1-8 water nozzles, and a water pressure of 1.2 MPa-1.5 MPa. After water pumping, the product flange exhibits no deformation, and the flange inclination meets standard requirements. This structure allows for specific inclination data to be set within a set range for hot-rolled H-beams of varying specifications, further improving product rolling quality and effectively preventing deformation.

[0031] As Example 4, when rolling hot-rolled H-shaped steel of specification 305×305×223, the inclination of the upper horizontal roll side working surface 3 of the upper horizontal roll rolling end 2 of the upper horizontal roll 1 and the horizontal line 13 is 88.2°; the inclination of the lower horizontal roll side working surface 7 of the lower horizontal roll rolling end 6 of the lower horizontal roll 5 and the horizontal line 13 is in the range of 88.2°; the inclination of the vertical roll end working surface 10 of the vertical roll rolling end 9 of the first vertical roll 11 and the horizontal line 13 is in the range of 88.2°. The working surface 10 of the vertical roller end 9 of the second vertical roller 12 is inclined at 88.2° to the horizontal line 13. The continuously cast beam blank is heated in a heating furnace to 1200°C-1280°C. A descaling mill removes surface scale before entering the slab mill for 9-15 reciprocating passes of varying pass profiles. The rolled piece then enters the universal roughing mill for 1-7 reciprocating passes, and the H-beam undergoes a final pass in the finishing mill. After exiting the finishing mill, water is pumped in, with side baffle openings ranging from 900 mm to 960 mm, 1-21 water nozzles, and a water pressure of 1.2 MPa-1.5 MPa. After water pumping, the product flange exhibits no deformation, and the flange inclination meets standard requirements. This structure allows for specific set inclination data within a set range for hot-rolled H-beams of varying specifications, further improving product rolling quality and effectively preventing deformation.

[0032] The finishing mill structure for controlling flange deformation of hot-rolled H-shaped steel after rapid cooling according to the present invention improves the local structure of the finishing mill. Specifically, the structure of the upper horizontal roll 1, the lower horizontal roll 5, and the vertical roll 8 is improved so that the upper horizontal roll side working surface 3 of the upper horizontal roll rolling end 2 forms an inclination with the vertical line 4 within a specific range; the lower horizontal roll side working surface 7 of the lower horizontal roll rolling end 6 forms an inclination with the vertical line 4 within a specific range; and the vertical roll end working surface 10 of the vertical roll rolling end 9 forms an inclination with the vertical line 4 within a specific range. In this way, during the rolling process of H-shaped steel of different specifications, the heating temperature of the continuous casting special-shaped billet is controlled after passing through the heating furnace, the descaling machine removes the surface iron oxide, and the billet enters the blanking machine for reciprocating rolling. The rolled piece enters the roughing mill for reciprocating rolling, and the H-shaped steel is rolled in the finishing mill for the last pass. After leaving the finishing mill, it is water-pierced, the opening degree of the side baffle is controlled, the number of water nozzles is controlled, and the water pressure is controlled to improve the quality of the product after rolling. After water-piercing, the product flange has no deformation and the flange inclination meets the standard requirements.

[0033] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A finishing mill structure for controlling flange deformation of hot-rolled H-beams during rapid cooling after rolling, characterized in that: When rolling hot-rolled H-shaped steel of 630×200×15×20 specifications, the slope of the upper horizontal roller side working surface (3) of the upper horizontal roller rolling end (2) of the upper horizontal roller (1) and the horizontal line (13) is 87.5°; the slope of the lower horizontal roller side working surface (7) of the lower horizontal roller rolling end (6) of the lower horizontal roller (5) and the horizontal line (13) is 87.5°; the slope of the vertical roller end working surface (10) of the vertical roller rolling end (9) of the first vertical roller (11) and the horizontal line (13) is 87.5°. 87.5°, the slope of the vertical roller end working surface (10) of the vertical roller rolling end (9) of the second vertical roller (12) and the horizontal line (13) is 87.5°; the continuous casting special-shaped billet is heated to 1200℃-1280℃ in a heating furnace, the scale remover removes the surface iron oxide, and enters the billet opening machine for 9-15 reciprocating rolling in different pass types, and the rolled piece enters the universal rough rolling mill for 1-9 reciprocating rolling, the H-shaped steel is rolled in the finishing mill for the last pass, and is water-pierced after leaving the finishing mill, with the side baffle opening of 1100 mm-1140 mm, the number of water nozzles 1-10 groups, and the water pressure of 1.2 MPa-1.5 MPa. After water-piercing, the flange of the product has no deformation and the flange inclination meets the standard requirements.

2. A finishing mill structure for controlling flange deformation of hot-rolled H-beams during rapid cooling after rolling, characterized in that: When rolling hot-rolled H-shaped steel of specification 488×300×11×18, the slope of the upper horizontal roller side working surface (3) of the upper horizontal roller rolling end (2) of the upper horizontal roller (1) and the horizontal line (13) is 88.6°; the slope of the lower horizontal roller side working surface (7) of the lower horizontal roller rolling end (6) of the lower horizontal roller (5) and the horizontal line (13) is 88.6°; the slope of the vertical roller end working surface (10) of the vertical roller rolling end (9) of the first vertical roller (11) and the horizontal line (13) is 88.6°. 88.6°, the slope of the vertical roller end working surface (10) of the vertical roller rolling end (9) of the second vertical roller (12) and the horizontal line (13) is 88.6°; the continuous casting special-shaped billet is heated to 1200℃-1280℃ in a heating furnace, the scale remover removes the surface iron oxide, and enters the billet opening machine for 9-15 reciprocating rolling in different pass types, and the rolled piece enters the universal rough rolling mill for 1-7 reciprocating rolling, and the H-shaped steel is rolled in the finishing mill for the last pass; after leaving the finishing mill, it is water-pierced, the side baffle opening is 990 mm-1030 mm, the number of water nozzles is 1-8 groups, the water pressure is 1.2 MPa-1.5 MPa, and the flange of the product has no deformation after water-piercing, and the flange inclination meets the standard requirements.

3. A finishing mill structure for controlling flange deformation of hot-rolled H-beams during rapid cooling after rolling, characterized in that: When rolling hot-rolled H-shaped steel of specification 305×305×223, the slope of the upper horizontal roller side working surface (3) of the upper horizontal roller rolling end (2) of the upper horizontal roller (1) and the horizontal line (13) is 88.2°; the slope of the lower horizontal roller side working surface (7) of the lower horizontal roller rolling end (6) of the lower horizontal roller (5) and the horizontal line (13) is 88.2°; the slope of the vertical roller end working surface (10) of the vertical roller rolling end (9) of the first vertical roller (11) and the horizontal line (13) is 8 8.2°, the slope of the vertical roller end working surface (10) of the vertical roller rolling end (9) of the second vertical roller (12) and the horizontal line (13) is 88.2°; the continuous casting special-shaped billet is heated to 1200℃-1280℃ in a heating furnace, the scale remover removes the surface oxidized iron scale, enters the blanking mill and is rolled back and forth in 9-15 passes of different pass types, the rolled piece enters the universal roughing mill and is rolled back and forth in 1-7 passes, and the H-shaped steel is rolled in the finishing mill for the last pass; after leaving the finishing mill, it is water-pierced, the side baffle opening is 900 mm-960mm, the number of water nozzles is 1-21 groups, the water pressure is 1.2 MPa-1.5 MPa, and the flange of the product has no deformation after water-piercing, and the flange slope meets the standard requirements.

Images