Online rolling method for hot-rolled H-beam

Abstract

The present invention discloses a method for online rolling of hot-rolled H-beams, wherein a UR mill, an E mill, and a UF mill are used to roll the workpiece. The UR mill includes a horizontal upper roller and a horizontal lower roller. The horizontal upper roller has an upper receiving groove for accommodating protrusions formed on the surface of the workpiece due to plastic deformation, and the horizontal lower roller has a lower receiving groove for accommodating the protrusions. The rollers of the UF mill are provided with a steel stamp for forming an anti-counterfeiting mark on the workpiece. The online method for rolling hot-rolled H-beams of the present invention, by treating the rollers of the UR mill, effectively solves the problem of using the UR-E-UF mill arrangement to reciprocately roll H-beams with marks. The UR and UF mills can be put into use simultaneously, thereby improving the production efficiency of hot-rolled H-beams without reducing the surface quality of the H-beams, ensuring that the anti-counterfeiting marks on the surface of the H-beams are clear.

Description

Technical Field

[0001] The present invention belongs to the technical field of hot-rolled H-shaped steel production, and more particularly, relates to an online rolling method for hot-rolled H-shaped steel. Background Art

[0002] A logo is the external basis for identifying an object. It uses simple and clear patterns and text symbols as an intuitive language. Different companies have different logos, and the same is true for steel production companies. Although different companies have different corporate logos, their functions during use are the same, namely identification and anti-counterfeiting. There are generally two methods for manufacturing anti-counterfeiting logos for steel production companies: 1. Directly spraying the corporate logo on the surface of the finished material or sticking a logo label; 2. During the last deformation pass, the anti-counterfeiting logo pattern engraved on the surface of the roller is used to roll into the product surface to form a raised three-dimensional logo. Since the first method is extremely easy to imitate during the product circulation process, making it difficult to distinguish between genuine and fake products, steel production companies generally use the method of rolling the finished product surface during the final rolling pass to form a raised three-dimensional logo for identification and anti-counterfeiting. Currently, the main layouts for steel section production lines in China are: 1. BD+(UR1-E-UR2)+UF (one slab mill, three universal roughing mills, and one universal finishing mill); 2. 5-stand tandem mill + 10-stand tandem mill; 3. Two roughing mills (BD1+BD2) + 6-stand tandem mill; and 4. Two roughing mills (BD1+BD2) + (UR1-E-UF). In the first three mill arrangements, the finishing mill (UF mill) does not participate in the rolling process, only in the final rolling pass. Therefore, anti-counterfeiting measures can be implemented by engraving anti-counterfeiting markings on its rolls and, combined with appropriate reduction, to prevent counterfeiting of steel section products. When a steel mill uses the UR-E-UF mill layout to roll H-beams using the XH method, if production is carried out according to the above method, with only the UR mill involved in the early rolling process and the UF mill only involved in the final rolling pass, its efficiency is low, seriously affecting production. If both the UR and UF mills are used for rolling at the same time, the UF mill will have an anti-counterfeiting mark engraved on it, causing the UF roller surface to be uneven. During the reciprocating rolling process, the raised anti-counterfeiting mark on the billet surface will be repeatedly crushed, resulting in serious surface quality problems. When using the UR-E-UF mill layout for H-beam rolling, how to ensure that the UR and UF mills are used simultaneously to reciprocate and roll H-beams with anti-counterfeiting marks, and that the surface quality meets customer requirements, becomes a major technical challenge. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an online rolling method for hot-rolled H-beams, the purpose of which is to improve the production efficiency of hot-rolled H-beams without reducing the surface quality and ensure that the surface markings of the steel are clear.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an online rolling method for hot-rolled H-shaped steel, using a UR rolling mill, an E rolling mill and a UF rolling mill to roll the rolled product, the UR rolling mill includes a horizontal upper roller and a horizontal lower roller, the horizontal upper roller has an upper accommodating groove for accommodating the protrusion formed on the surface of the rolled product due to plastic deformation, the horizontal lower roller has a lower accommodating groove for accommodating the protrusion, and the rollers of the UF rolling mill are provided with a steel stamp for forming an anti-counterfeiting mark on the rolled product.

[0005] The depth of the upper accommodating groove is 0.5-1.5 mm.

[0006] The depth of the lower accommodating groove is 0.2-2.0 mm.

[0007] The width of the upper accommodating groove and the lower accommodating groove is 20 to 25 mm greater than the outer radius of the anti-counterfeiting mark.

[0008] The angle α1 between the first upper inner wall surface in the upper accommodating groove and the outer cylindrical surface of the horizontal upper roller is controlled to be 60<α1≤90°, and the angle α2 between the first lower inner wall surface in the lower accommodating groove and the outer cylindrical surface of the horizontal lower roller is controlled to be 60<α2≤90°.

[0009] The two opposite inner wall surfaces of the groove of the steel stamp are arranged in a U shape, and the angle α3 between the inner wall surface of the groove and the outer cylindrical surface of the roller of the UF rolling mill is controlled to be between 45<α3≤65°.

[0010] The depth of the groove of the steel stamp is controlled between 1.0 and 2.0 mm.

[0011] The width of the groove of the steel stamp is controlled between 8 and 10 mm.

[0012] During the rolling process of the rolled piece, the entire reduction procedure is divided into four stages: in the first stage, only the UR rolling mill participates in the rolling, and the reduction rate of the web of the rolled piece is 20-25%; in the second stage, the UR rolling mill and the UF rolling mill participate in the rolling at the same time, the reduction rate of the web of the rolled piece is 50-55%, and an anti-counterfeiting mark is formed on the surface of the rolled piece; in the third stage, only the UR rolling mill participates in the rolling, and the reduction rate of the web of the rolled piece is 12-16%, and the anti-counterfeiting mark formed on the surface of the rolled piece when the UF rolling mill participates in the rolling in the second stage is flattened; in the fourth stage, the UR rolling mill and the UF rolling mill participate in the rolling at the same time, the reduction rate of the web of the rolled piece is 10-12%, and the reduction rate of the UF rolling mill during the last rolling pass is 0-5%.

[0013] During the rolling process of the rolled piece, the ratio between the flange thickness and the web thickness of the rolled piece is controlled to be between 1.25 and 1.35.

[0014] The hot-rolled H-beam online rolling method of the present invention effectively solves the problem of using the UR-E-UF rolling mill arrangement to reciprocately roll the marked H-beam by processing the UR rolling mill rolls. The UR and UF can be put into use at the same time, thereby improving the production efficiency of the hot-rolled H-beam without reducing the surface quality of the H-beam, and ensuring that the anti-counterfeiting mark on the surface of the H-beam is clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] This manual includes the following drawings, which show the following contents:

[0016] Figure 1 It is a cross-sectional view of the UR roll;

[0017] Figure 2 It is a cross-sectional view of the UF roller stamp;

[0018] Figure 3 It is a plan view of the UF roller stamp;

[0019] Figure 4 It is a steel-stamped stereogram;

[0020] Figure 5 This is a diagram of the roller arrangement. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the specific implementation methods of the present invention through the description of the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and to facilitate their implementation.

[0022] The invention provides an online rolling method for hot-rolled H-shaped steel, which utilizes a UR rolling mill, an E rolling mill and a UF rolling mill to roll the rolled piece.

[0023] Specifically, if Figure 1 As shown, the UR rolling mill includes a horizontal upper roller and a horizontal lower roller. The upper roller has an upper receiving groove to accommodate protrusions formed on the workpiece surface due to plastic deformation, while the lower roller has a lower receiving groove to accommodate the protrusions. The upper roller is located above the lower roller, with their axes parallel. The upper receiving groove is located above the lower receiving groove, and the upper and lower receiving grooves are aligned vertically. The upper receiving groove is a circular groove provided on the outer circumference of the upper roller, located midway along the length of the upper roller. The lower receiving groove is a circular groove provided on the outer circumference of the lower roller, located midway along the length of the lower roller. Grooving the upper and lower horizontal rollers of the UR mill aligns the central axis of the grooves with the central axis of the grooves stamped on the UF roller. That is, the center points of the upper and lower receiving grooves are aligned vertically with the center points of the UF roller stamp.

[0024] Preferably, the depth of the upper accommodating groove is 0.5-1.5 mm, and the depth of the lower accommodating groove is 0.2-2.0 mm. Figure 1 As shown, the width d of the upper accommodating groove and the lower accommodating groove is 20 to 25 mm larger than the outer circle radius R2 of the anti-counterfeiting mark, that is, the width d of the upper accommodating groove and the lower accommodating groove is d = R2 + (20 to 25) mm, the groove mouth must have a smooth transition and no sharp corners, and the width direction of the upper accommodating groove and the lower accommodating groove is parallel to the axis of the horizontal upper roller and the horizontal lower roller.

[0025] like Figure 1 As shown, the upper accommodating tank has a first upper inner wall surface and a second upper inner wall surface. There are two first upper inner wall surfaces, arranged in a V-shape and symmetrically. The second upper inner wall surface is located between the two first upper inner wall surfaces and is a cylindrical surface. The first upper inner wall surface is a conical surface. The smaller diameter ends of the two first upper inner wall surfaces are respectively connected to the two ends of the second upper inner wall surface, and the larger diameter ends of the two first upper inner wall surfaces are connected to the outer circumference of the horizontal upper roller. The angle α1 between the first upper inner wall surfaces in the upper accommodating tank and the outer circumference of the horizontal upper roller is controlled to be 60<α1≤90°.

[0026] like Figure 1 As shown, the lower accommodating tank has a first lower inner wall surface and a second lower inner wall surface. There are two first lower inner wall surfaces, arranged in a V-shape and symmetrically. The second lower inner wall surface is located between the two first lower inner wall surfaces and is a cylindrical surface. The first lower inner wall surface is a conical surface. The smaller diameter ends of the two first lower inner wall surfaces are respectively connected to the two ends of the second lower inner wall surface, while the larger diameter ends of the two first lower inner wall surfaces are connected to the outer circumference of the horizontal lower roller. The angle α2 between the first lower inner wall surfaces in the lower accommodating tank and the outer circumference of the horizontal lower roller is controlled to be 60<α2≤90°.

[0027] The purpose of treating the UR rolling mill rollers is to ensure that the anti-counterfeiting mark on the rolled piece can be flattened during the subsequent rolling process, and that there is enough metal to press the anti-counterfeiting mark into the final rolling process, and to ensure that the anti-counterfeiting mark on the surface of the H-beam is clear.

[0028] Preferably, the angle α1 between the first upper inner wall surface in the upper accommodating groove and the outer cylindrical surface of the horizontal upper roller can be 61°, 62°, 63°, 64°, 65°, 66°, 67°, 68°, 69°, 70°, 71°, 72°, 73°, 74°, 75°, 76°, 77°, 78°, 79°, 80°, 81°, 82°, 83°, 84°, 85°, 86°, 87°, 88°, 89° or 90°.

[0029] Preferably, the angle α2 between the first upper inner wall surface in the upper accommodating groove and the outer cylindrical surface of the horizontal upper roller can be 61°, 62°, 63°, 64°, 65°, 66°, 67°, 68°, 69°, 70°, 71°, 72°, 73°, 74°, 75°, 76°, 77°, 78°, 79°, 80°, 81°, 82°, 83°, 84°, 85°, 86°, 87°, 88°, 89° or 90°.

[0030] like Figure 2 As shown, the UF rolling mill rolls are equipped with a steel stamp for forming an anti-counterfeiting mark on the protruding portion. The two opposing inner walls of the steel stamp groove are arranged in a U-shape, and the angle α3 between the inner wall of the groove and the outer circumference of the UF rolling mill roll is controlled to be between 45<α3≤65°. If the groove angle is set too large, the surface steel stamp will be unclear and irregular, and the top and bottom of the raised mark will easily stick together. If the groove angle is set too small, the steel stamp on the H-beam surface will be difficult to release from the mold during rolling, resulting in surface quality problems such as sticking and scratching.

[0031] like Figure 2 As shown, the shape of the steel stamp groove is the same as the shape of the anti-counterfeiting mark to be printed on the surface of the H-shaped steel. The steel stamp groove is a groove formed on the outer cylindrical surface of the roller. The first ends of the two inner wall surfaces of the groove are connected to the groove bottom surface of the groove. The groove bottom surface is a circular arc surface. The second ends of the two inner wall surfaces are connected to the outer cylindrical surface of the roller. The first end and the second end of the inner wall surface are the opposite ends of the inner wall surface. The distance between the first ends of the two inner wall surfaces (that is, the groove bottom surface width) is smaller than the distance between the second ends of the two inner wall surfaces, so that the groove forms a larger opening on the outer cylindrical surface of the roller.

[0032] like Figure 2 As shown in the figure, the depth b of the steel stamp groove is controlled between 1.0 and 2.0 mm, and the width a of the steel stamp groove is controlled between 8 and 10 mm. The bottom of the groove is tangent to the inner wall of the groove through a tangent arc. If the groove depth b is too deep, the steel stamp will be pressed too deeply into the steel billet during the early rolling stage of the UF rolling mill, resulting in serious surface quality defects such as folding and warping during the subsequent rolling process. If the groove depth b is too shallow, the steel stamp on the surface of the steel billet will be shallow after the last UF rolling, or even no steel stamp will appear.

[0033] Preferably, the angle α3 between the inner wall of the groove and the outer circumference of the roller of the UF rolling mill can be 46°, 47°, 48°, 49°, 50°, 51°, 52°, 53°, 54°, 55°, 56°, 57°, 58°, 59°, 60°, 61°, 62°, 63°, 64° or 65°. The depth b of the stamped groove can be 1 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2 mm; the notch width a of the stamped groove can be 8 mm, 8.5 mm, 9 mm, 9.5 mm or 10 mm.

[0034] In this embodiment, the groove width a of the steel stamp is 8 mm, which ensures that the steel stamp on the surface of the steel is clear and regular during the UF rolling process of the finished product.

[0035] like Figure 3 As shown, in order to ensure the clarity of the anti-counterfeiting mark on the rolled steel surface, it is also necessary to stipulate that the R1 of the steel stamp is 23-26mm; R2 is 30-35mm. β is 90-90.5°; C is 138-142mm; c / d=1.89-1.97, γ is 0.5mm×45° (the specific size parameters of the Magang mark on the roll should meet the following requirements to avoid surface quality problems during the rolling process; R1 is the inner circle radius of the Magang mark, R2 is the outer circle radius of the Magang mark, β is the middle angle similar to the M mark, C is the distance between the long side of the mark, d is the distance between the corresponding short side of the mark, and the ratio of the two must meet the following requirements: c / d=1.89-1.97, γ is the angle between the long side C and the oblique side of the mark).

[0036] The rolling process is divided into four stages: In the first stage, only the UR mill rolls, with a web reduction of 20-30%. In the second stage, both the UR and UF mills roll simultaneously, with a web reduction of 45-55%, and an anti-counterfeiting mark formed on the surface. In the third stage, only the UR mill rolls, with a web reduction of 12-15%, smoothing out the anti-counterfeiting mark formed by the UF mill in the second stage. In the fourth stage, both the UR and UF mills roll simultaneously, with a web reduction of 8-15%. The UF mill also rolls the final pass at a reduction of 2-10%. By adjusting the process design of this production line, the anti-counterfeiting mark on the surface of the H-beams remains clear after rolling.

[0037] Furthermore, during the rolling process, the ratio between the flange thickness and the web thickness of the rolled product is controlled to be between 1.25 and 1.35. That is, throughout the rolling process, it is also necessary to ensure that the ratio between the flange thickness Fn and the web thickness Wm of each pass remains constant, as does the flange thickness F1 and the web thickness W1 of the finished hot-rolled H-beam, i.e., f / w = 1.25 to 1.35.

[0038] Example 1:

[0039] When the above method is used to roll UB305*305*223 hot-rolled H-shaped steel, the key parameters of the marking size are: a=8mm; b=1.5m, c=140mm, R1=25mm, R2=33mm, β: 90°, γ: 0.5mm×45°, and the reduction procedure for this specification is: in the first stage, only the UR rolling mill participates in rolling, and the reduction rate of the web is 24.8%; in the second stage, UR and UF participate in rolling at the same time, and the reduction rate of the web is 53.6%; in the third stage, only UR participates in rolling, and the reduction rate of the web is 13.9%. The steel stamp left on the surface of the billet by UF in the second stage is flattened to ensure the surface quality of the steel after rolling; in the fourth stage, UR and UF participate in rolling at the same time, the reduction rate of the web is 11.1%, and the reduction rate of the last UF is ensured to be 5%, ensuring that the steel stamp on the surface of the steel is clear and regular.

[0040] Table 1 Rolling procedures of Example 1

[0041]

[0042] Example 2:

[0043] When the above method is used to roll W44*233 hot-rolled H-shaped steel, the key parameters of the marking size are: a=8mm; b=1.5m, c=142mm, R1=24mm, R2=35mm, β: 90.5°, γ: 0.5mm×45°, and the reduction procedure for this specification is: in the first stage, only the UR rolling mill participates in rolling, and the reduction rate of the web is 25.7%; in the second stage, UR and UF participate in rolling at the same time, and the reduction rate of the web is 54.3%; in the third stage, only UR participates in rolling, and the reduction rate of the web is 24%. The steel stamp left on the surface of the billet by UF in the second stage is flattened to ensure the surface quality of the steel after rolling; in the fourth stage, UR and UF participate in rolling at the same time, the reduction rate of the web is 10.4%, and the reduction rate of the last UF is ensured to be 5%, ensuring that the steel stamp on the surface of the steel is clear and regular.

[0044] Table 2 Rolling procedures of Example 2

[0045]

[0046] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described method. Any non-substantial improvements made using the method concepts and technical solutions of the present invention, or any direct application of the above-described concepts and technical solutions to other situations without modification, fall within the scope of protection of the present invention.

Claims

1. A method for online hot-rolled H-beam rolling, wherein the rolled product is rolled using a UR rolling mill, an E rolling mill, and a UF rolling mill, wherein the UR rolling mill includes a horizontal upper roll and a horizontal lower roll, and is characterized in that: The horizontal upper roller has an upper receiving groove for receiving the protrusion formed on the surface of the rolled piece due to plastic deformation, and the horizontal lower roller has a lower receiving groove for receiving the protrusion. The rollers of the UF rolling mill are provided with a steel stamp for forming an anti-counterfeiting mark on the rolled piece. During the rolling process of the rolled piece, the entire reduction procedure is divided into four stages: in the first stage, only the UR rolling mill participates in the rolling, and the reduction rate of the web of the rolled piece is 20~25%; in the second stage, the UR rolling mill and the UF rolling mill participate in the rolling at the same time, and the reduction rate of the web of the rolled piece is 50~55%; in the third stage, only the UR rolling mill participates in the rolling, and the reduction rate of the web of the rolled piece is 12~16%, and the anti-counterfeiting mark formed on the surface of the rolled piece when the UF rolling mill participates in the rolling in the second stage is flattened; in the fourth stage, the UR rolling mill and the UF rolling mill participate in the rolling at the same time, and the reduction rate of the web of the rolled piece is 10~12%. At the same time, the reduction rate of the UF rolling mill in the last rolling pass is 0~5%.

2. The hot-rolled H-beam online rolling method according to claim 1, characterized in that: The depth of the upper accommodating groove is 0.5-1.5 mm.

3. The method for online hot-rolled H-beam according to claim 1, characterized in that: The depth of the lower accommodating groove is 0.2-2.0 mm.

4. The online rolling method for hot-rolled H-beam according to any one of claims 1 to 3, characterized in that: The width of the upper accommodating groove and the lower accommodating groove is 20-25 mm larger than the outer radius of the anti-counterfeiting mark.

5. The online rolling method for hot-rolled H-beam according to any one of claims 1 to 3, characterized in that: The angle α1 between the first upper inner wall surface in the upper accommodating groove and the outer cylindrical surface of the horizontal upper roller is controlled to be 60<α1≤90°, and the angle α2 between the first lower inner wall surface in the lower accommodating groove and the outer cylindrical surface of the horizontal lower roller is controlled to be 60<α2≤90°.

6. The online rolling method for hot-rolled H-beam according to any one of claims 1 to 3, characterized in that: The two opposite inner wall surfaces of the groove of the steel stamp are arranged in a U shape, and the angle α3 between the inner wall surface of the groove and the outer cylindrical surface of the roller of the UF rolling mill is controlled to be between 45<α3≤65°.

7. The method for online hot-rolled H-beam according to claim 6, characterized in that: The depth of the groove of the steel stamp is controlled between 1.0 and 2.0 mm.

8. The method for online hot-rolled H-beam according to claim 6, characterized in that: The width of the groove of the steel stamp is controlled between 8 and 10 mm.

9. The online rolling method for hot-rolled H-beam according to any one of claims 1 to 3, characterized in that: During the rolling process of the rolled piece, the ratio between the flange thickness and the web thickness of the rolled piece is controlled to be between 1.25 and 1.35.

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