Method for producing H-shaped steel with asymmetric left and right flange widths
By adopting a specific hole combination and multi-stage rolling process in the H-beam production process, combined with cooling bed monitoring, the problems of asymmetric H-beam flange size control and lateral bending were solved, achieving precise production and safe rolling.
Patent Information
- Application Number
- CN202510752388.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-06
- Publication Date
- 2025-09-16
AI Technical Summary
When producing H-shaped steel with asymmetric left and right flange widths, existing technologies make it difficult to accurately control the flange size and prevent the rolled piece from bending sideways, resulting in metal flow rate differences and rolling accidents.
A combination of symmetrical closed-end pass, asymmetrical closed-end pass and asymmetrical open-end pass is adopted, combined with universal rolling, edge rolling and universal edge rolling, the flange width deviation is controlled through multiple stages, and the side bending is monitored using dynamic jet cooling of the cooling bed.
It achieves precise control of the flange size of the finished asymmetric H-beam, reduces the risk of lateral bending, and avoids rolling accidents.
Smart Images
Figure CN120644460A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of H-beam rolling, and in particular to a method for producing H-beam with asymmetric left and right flange widths. Background Art
[0002] Currently, hot-rolled H-beams are produced using a universal rolling process, where the product is rolled bisymmetrically (in both height and width) into an H-shape. The upper and lower horizontal rolls compress the web in the thickness direction, while the vertical rolls on either side compress the flanges in the thickness direction.
[0003] When the H-beam is asymmetrically arranged and has an asymmetrical structure with left and right flange widths, the widths of the left and right flanges need to be controlled at specific values during the hot rolling process. This requires precise design during the rolling process, otherwise the dimensions will easily deviate. In addition, the thickness or width of the flanges on both sides also needs to be strictly controlled during the rolling process. If the thickness or width of the flanges on both sides is not controlled during the rolling process, there will be a difference in the metal flow rate of the flanges on both sides, resulting in different rolling extensions on both sides. The rolled piece will inevitably bend sideways, which will accumulate to a certain extent and affect the bite of the subsequent pass. If the difference in the metal flow rate of the flanges on both sides is too large, severe lateral bending will cause a rolling accident.
[0004] In view of this, the inventor, based on many years of production design experience in this field and related fields, has designed a method for producing H-shaped steel with asymmetric left and right flange widths after repeated experiments, in order to solve the problems existing in the prior art. Summary of the Invention
[0005] The object of the present invention is to provide a method for producing H-shaped steel with asymmetric left and right flange widths, which can produce H-shaped steel with asymmetric left and right flange widths.
[0006] To achieve the above object, the present invention provides a method for producing an H-shaped steel with asymmetric left and right flange widths, wherein the method for producing an H-shaped steel with asymmetric left and right flange widths at least comprises:
[0007] The blanking hole is rolled, and the hole profile used includes at least a symmetrical closed hole profile, at least one asymmetrical closed hole profile, and an asymmetrical open hole profile, so that after the blanking rolling, an H-shaped steel intermediate blank with asymmetrical left and right flange widths is formed;
[0008] Continuous rolling: the H-beam intermediate billet undergoes universal rolling, edge rolling and universal edge rolling multiple times, the thickness of the H-beam intermediate billet is reduced by the universal rolling mill and edge rolling mill, and the asymmetric flange of the H-beam intermediate billet is positioned by the universal edge rolling mill to form an H-beam finished product;
[0009] Cooling: placing the H-shaped steel product into a cooling bed for cooling and side bending control.
[0010] Compared with the prior art, the present invention has the following characteristics and advantages:
[0011] In the blanking and rolling stage, a symmetrical closed hole profile, at least one asymmetrical closed hole profile and an asymmetrical open hole profile are used. The flange width deviation of the H-beam intermediate billet is gradually expanded through the staged blanking hole profile design. Then, the asymmetrical flange size of the H-beam finished product is accurately controlled by combining universal rolling, edge rolling and universal edge rolling. Finally, dynamic jet cooling of the cooling bed is used to control the side bending monitoring of the H-beam finished product. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the drawings are merely illustrative and are used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances under the guidance of the present invention.
[0013] Figure 1 This is a schematic structural diagram of the H-shaped steel product of the present invention;
[0014] Figure 2 Schematic diagram of the hole type of the blank hole in the present invention;
[0015] Figure 3 Schematic diagram of continuous rolling in one embodiment of the present invention;
[0016] Figure 4 Schematic diagram of the universal edge rolling pass in the present invention;
[0017] Figure 5 It is a schematic diagram of continuous rolling in another embodiment of the present invention.
[0018] Description of Reference Numerals
[0019] 11. Symmetrical closed hole type; 12. First asymmetric closed hole type;
[0020] 13. Second asymmetric closed hole type 14. Asymmetric open hole type
[0021] 200. H-shaped steel finished products. DETAILED DESCRIPTION
[0022] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only for the purpose of explaining the present invention and are not to be construed as limiting the present invention in any way. Based on the teachings of the present invention, a skilled person can conceive of any possible variations based on the present invention, and such variations should be considered to fall within the scope of the present invention.
[0023] The present invention proposes a method for producing H-shaped steel with asymmetric left and right flange widths. Figures 1 to 5 The method for producing H-shaped steel with asymmetric left and right flange widths at least includes:
[0024] The blank rolling process uses blank hole profiles including at least a symmetrical closed hole profile 11, at least one asymmetrical closed hole profile and an asymmetrical open hole profile 14, so that an H-shaped intermediate blank with asymmetrical left and right flange widths is formed after blank rolling.
[0025] In continuous rolling, the H-beam intermediate billet undergoes universal rolling, edge rolling and universal edge rolling for multiple times, the thickness of the H-beam intermediate billet is thinned by the universal rolling mill and the edge rolling mill, and the asymmetric flange of the H-beam intermediate billet is positioned by the universal edge rolling mill to form the H-beam finished product 200.
[0026] Cooling, placing the H-shaped steel product 200 into a cooling bed for cooling and side bending control.
[0027] The method for producing H-shaped steel with asymmetric left and right flange widths proposed in the present invention adopts a symmetrical closed hole profile 11, at least one asymmetric closed hole profile and an asymmetric open hole profile 14 in the blanking and rolling stage, gradually expands the flange width deviation of the H-shaped steel intermediate blank through staged blanking hole profile design, and then combines universal rolling, edge rolling and universal edge rolling to accurately control the asymmetric flange size of the H-shaped steel finished product; finally, dynamic jet cooling of the cooling bed is used to reduce the lateral bending monitoring of the H-shaped steel finished product.
[0028] In an optional embodiment of the present invention, two asymmetric closed hole profiles are used for blank rolling, and the two asymmetric closed hole profiles are respectively a first asymmetric closed hole profile 12 and a second asymmetric closed hole profile 13. The left and right flange widths of the first asymmetric closed hole profile 12 have a first preset deviation, and the left and right flange widths of the second asymmetric closed hole profile 13 have a second preset deviation.
[0029] Furthermore, the first preset deviation ranges from 31 mm to 41 mm, and the second preset deviation ranges from 45 mm to 55 mm.
[0030] Preferably, the first preset deviation is 36 mm, and the second preset deviation is 50 mm.
[0031] In an optional example of this embodiment, the left and right flange widths of the asymmetric opening hole profile 14 have a third preset deviation.
[0032] Furthermore, the third preset deviation ranges from 45 mm to 55 mm.
[0033] Preferably, the third preset deviation is 50 mm.
[0034] In an optional example of the present invention, Figure 2 As shown, the symmetrical closed hole type 11, the first asymmetrical closed hole type 12, the second asymmetrical closed hole type 13 and the asymmetrical open hole type 14 gradually transition, specifically:
[0035] The symmetrical closed pass 11 has the same width on the left and right flanges. The workpiece undergoes four rolling passes in this pass, with the steel being turned over once after two passes. This hole is a deep cut hole, where rectangular billets are cut into irregular shapes. The deep cut hole serves as the initial positioning hole, where the rectangular billet enters the pass for positioning and slitting. To ensure symmetry during slitting, the pass is designed to be bilaterally symmetrical. This symmetry prevents lateral bending of the workpiece, eliminating the need for guard plates before and after the pass. Four reciprocating rolling passes are possible.
[0036] The first asymmetric closed hole 12 has a 36mm deviation in the width of the left and right flanges. Figure 2 The first asymmetric closed pass 12 is shown in Figure 1. After turning the steel, the workpiece enters this pass and undergoes one rolling pass. The workpiece flange exhibits some left-right width deviation in this pass, but does not completely fill the pass. Because the workpiece temperature is very high during this pass, some minor left-right uneven deformation occurs. This can be corrected using the slab mill roll guides and pusher. This pass undergoes only one rolling pass, ensuring the guides are positioned close to the pass exit, limiting lateral bending of the workpiece.
[0037] The second asymmetric closed hole 13 has a 50mm deviation in the width of the left and right flanges. Figure 2 The second asymmetric closed pass 13 is used. After turning the steel, the workpiece enters this pass and undergoes a single rolling pass. The width deviation of the workpiece flanges further increases in this pass. For the same reason as the first asymmetric closed pass 12, the workpiece temperature is very high during this pass, resulting in slight left-right uneven deformation. This can be corrected using the slab mill roll guides and pusher. This pass undergoes only a single rolling pass, ensuring the guides are positioned close to the die exit, limiting lateral bending of the workpiece.
[0038] Asymmetric open pass 14 is an open pass, with the left and right flange widths retaining a 50mm deviation from the previous pass. This pass is the final pass of the slab mill, completing rolling and final intermediate slab shaping.
[0039] In the present invention, after blooming and rolling, the H-beam intermediate billet enters the continuous rolling mill for rolling.
[0040] In an optional embodiment of the present invention, Figure 3 As shown, the H-beam intermediate billet undergoes the first universal rolling, edge rolling and the second universal rolling in sequence.
[0041] In an optional embodiment of the present invention, Figure 4 As shown, the leg ends of the H-beam intermediate billet are leveled by a universal edge rolling machine so that the obtained H-beam finished product 200 has leveled leg ends.
[0042] In an optional embodiment of the present invention, Figure 5 As shown, the H-beam intermediate billet undergoes universal edge rolling, universal rolling, ordinary edge rolling and finishing universal rolling in sequence.
[0043] In an optional embodiment of the present invention, the H-shaped steel product 200 is rolled by a finishing universal rolling mill.
[0044] In an optional embodiment of the present invention, when the H-beam finished product 200 is cooling, it is monitored in real time whether the H-beam finished product 200 generates side bending.
[0045] In an optional example of this embodiment, the lateral bending of the H-beam finished product is dynamically adjusted by adjusting the air injection volume and air injection point of the cooling bed.
[0046] Please describe in detail the specific implementation process of the method for producing H-shaped steel with asymmetric left and right flange widths proposed by the present invention in conjunction with an embodiment.
[0047] In this embodiment, the specification of the H-shaped steel product 200 is H400×200(150), and the method for producing the H-shaped steel with asymmetric left and right flange widths includes:
[0048] A hole pattern with multiple opening holes that gradually transitions between them is used to form an H-shaped intermediate billet with asymmetric left and right flange widths in the opening machine hole pattern;
[0049] After the blank is asymmetrically formed, it is rolled using the universal and edge rolling mills to ensure that the left and right flange widths meet the required dimensional accuracy. After entering the continuous rolling mill, the rolled piece mainly completes two tasks.
[0050] The workpiece is extended and deformed by combining the universal rolling mill and the edge rolling mill. Since the blanking mill has already achieved the asymmetry of the width of the left and right flanges of the workpiece, the continuous rolling mill mainly rolls the workpiece based on this asymmetry. The web thickness and flange thickness of the workpiece are further reduced. Figure 3As shown, multiple passes of universal rolling and edge rolling are performed. The edge rolling machine in the first pass can be a common two-roll edge rolling machine for edge pressing.
[0051] Use the universal edge rolling machine to accurately position the rolled piece. Universal edge rolling machine, add vertical rollers on both sides of the edge rolling machine, such as Figure 4 As shown. When the edge rolling mill is rolling, its main function is to level the leg ends, ultimately ensuring that the product obtains level leg ends, and generally does not press down the web. When the workpiece enters the universal edge rolling mill, the flange end contacts the horizontal roller of the edge rolling mill and is deformed. The vertical roller fixes the flange position, and the web contacts the horizontal roller without pressing down. At this time, if the web and flange positions are not centered, it is a center deviation defect of ordinary H-beam. Since the flange end of the workpiece contacts the horizontal roller, and the side of the flange contacts the vertical roller, the flange position is fixed. The roller surface of the horizontal roller will compress the deviated web toward the center position, thereby ensuring that the web of the workpiece is centered.
[0052] The subsequent rolled pieces then enter the universal rolling mill and the two-roller edge rolling mill for further rolling until they finally enter the finishing universal rolling mill to roll out the finished H-beam product 200.
[0053] The finished H-beam 200 is placed on the cooling bed. After being placed on the cooling bed, the finished H-beam 200 is basically in a static state. The high-temperature area is quickly cooled by jet cooling. If the cooling intensity is unreasonable and the accessories are bent sideways, it can be directly detected by the upper bending monitoring device and the jet volume and jet point can be adjusted immediately. In this way, the bending condition of the finished H-beam 200 on the cooling bed can be dynamically adjusted in real time.
[0054] The detailed explanations of the above-mentioned embodiments are intended only to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions cannot be interpreted as limiting the present invention for any reason. In particular, the various features described in different embodiments may also be arbitrarily combined with each other to form other embodiments. Unless otherwise clearly described, these features should be understood to be applicable to any embodiment and are not limited to the described embodiments.
Claims
1. A method for producing H-shaped steel with asymmetric left and right flange widths, characterized in that: The method for producing H-shaped steel with asymmetric left and right flange widths at least comprises: The blanking hole is rolled, and the hole profile used includes at least a symmetrical closed hole profile, at least one asymmetrical closed hole profile, and an asymmetrical open hole profile, so that after the blanking rolling, an H-shaped steel intermediate blank with asymmetrical left and right flange widths is formed; Continuous rolling: the H-beam intermediate billet undergoes universal rolling, edge rolling and universal edge rolling multiple times, the thickness of the H-beam intermediate billet is reduced by the universal rolling mill and edge rolling mill, and the asymmetric flange of the H-beam intermediate billet is positioned by the universal edge rolling mill to form an H-beam finished product; Cooling: placing the H-shaped steel product into a cooling bed for cooling and side bending control.
2. The method for producing H-shaped steel with asymmetric left and right flange widths according to claim 1, characterized in that: The slab rolling adopts two asymmetric closed hole profiles, which are respectively a first asymmetric closed hole profile and a second asymmetric closed hole profile. The left and right flange widths of the first asymmetric closed hole profile have a first preset deviation, and the left and right flange widths of the second asymmetric closed hole profile have a second preset deviation.
3. The method for producing H-shaped steel with asymmetric left and right flange widths according to claim 2, wherein: During the bloom rolling process, the transition is gradually carried out in the order of the symmetrical closed hole profile, the first asymmetrical closed hole profile, the second asymmetrical closed hole profile and the asymmetrical open hole profile.
4. The method for producing H-shaped steel with asymmetric left and right flange widths according to claim 1 or 2, characterized in that: The left and right flange widths of the asymmetric opening hole have a third preset deviation.
5. The method for producing H-shaped steel with asymmetric left and right flange widths according to claim 1, wherein: The asymmetric opening hole is used to complete the shaping of the H-shaped steel intermediate billet.
6. The method for producing H-shaped steel with asymmetric left and right flange widths according to claim 1, wherein: The H-beam intermediate billet is sequentially subjected to a first universal rolling process, an edge rolling process, and a second universal rolling process.
7. The method for producing H-shaped steel with asymmetric left and right flange widths according to claim 6, wherein: The leg ends of the H-beam intermediate billet are leveled by the universal edge rolling machine so that the obtained H-beam finished product has leveled leg ends.
8. The method for producing H-shaped steel with asymmetric left and right flange widths according to claim 6, wherein: The H-shaped steel product is rolled out by a finishing universal rolling mill.
9. The method for producing H-shaped steel with asymmetric left and right flange widths according to claim 1, wherein: When the H-beam finished product is cooling, whether the H-beam finished product generates side bending is monitored in real time.
10. The method for producing H-shaped steel with asymmetric left and right flange widths according to claim 9, wherein: The lateral bending of the H-shaped steel product is dynamically adjusted by adjusting the air injection volume and air injection point of the cooling bed.