A method for controlling the flange slope of hot-rolled H-beams during production.

Abstract

This invention discloses a production control method for the flange slope of hot-rolled H-beams, comprising the following steps: using a profilometer to detect H-beam roll data; determining whether the profilometer data meets the pre-judgment conditions of the standard requirements under hot steel conditions; if the pre-judgment conditions are met, saving the previous rolling state; if the pre-judgment conditions are not met, determining the relationship between the finished flange width B / 2 and D-R, i.e., (I+△i-(K+△k+R)); determining the current rolling line position of the mill based on the data measured by the profilometer; adjusting and saving the mill rolling line in the previous rolling state based on the relationship between the finished flange width B / 2 and D-R obtained in step three, and the rolling line position obtained in step four; rolling the roll using the saved rolling line position, and repeating steps one to five until the roll's external dimensions meet the pre-judgment conditions during the rolling process. This method can effectively control the problem of excessive flange slope during the production of hot-rolled H-beams.

Description

Technical Field

[0001] This invention relates to the field of hot-rolled H-beam technology, and in particular to a method for controlling the production slope of the flanges of hot-rolled H-beams. Background Technology

[0002] H-beams, with their advantages of large section modulus, strong bending resistance, light unit weight, and time-saving construction, are widely used in beam and column structural components of industrial and civil building steel structures, steel structural load-bearing supports of industrial structures, and frames of industrial equipment in petrochemical and power industries. Therefore, higher requirements are placed on the straightness of the H-beam section, and the perpendicularity of the flange and web is a key technical indicator during splicing and use.

[0003] Excessive flange slope in H-beams, also known as inward merging and outward expansion, refers to the flanges not being perpendicular to the web, thus disrupting the cross-sectional shape. This can result in either two flanges tilting or one flange tilting, exhibiting an upward merging and downward expansion or vice versa. Figure 5 and Figure 6 As shown. The flange slope is affected by many factors during hot rolling, such as the uniformity of cross-section cooling, the reduction of the vertical rolls of the finishing mill, the equipment precision during sawing, and the position of the universal rolling mill line. It is a difficult point in the shape control of hot-rolled H-beams.

[0004] For example, Chinese patent CN116037714A discloses a universal H-beam flange slope straightening device and method. The universal H-beam flange slope straightening device includes a conveyor roller table, and multiple convex straightening units and multiple concave straightening units are arranged along the length of the conveyor roller table. A concave straightening unit is arranged between two convex straightening units. This device and method are not controlled during rolling production, but are adjusted after production, which is not conducive to improving production efficiency and reducing costs. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a production control method for the flange slope of hot-rolled H-beams, which can effectively control the problem of excessive flange slope during the production of hot-rolled H-beams.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] The method for controlling the flange slope of hot-rolled H-beams includes the following steps:

[0008] Step 1: Use a profilometer to check the data of the H-beam rolled steel section;

[0009] Step 2: Determine whether the data detected by the profilometer meets the pre-judgment conditions of the standard requirements under hot steel conditions;

[0010] Step 3: If the pre-judgment conditions are met, save the previous rolling state. If the pre-judgment conditions are not met, determine the relationship between the finished flange width B / 2 and DR, where DR = I + Δi - (K + Δk + R); where B is the flange height of the H-beam, D is the distance between the center line of the roll and the center of the oscillating roller table, R is the radius of the oscillating roller table, I is the initial height of the rolling line, K is the initial height of the oscillating roller table, Δi is the height offset of the rolling line, and Δk is the height offset of the oscillating roller table.

[0011] Step 4: Determine the current rolling line position of the rolling mill based on the data measured by the profilometer;

[0012] Step 5: Based on the relationship between the finished flange width B / 2 and DR obtained in Step 3, and the rolling line position obtained in Step 4, adjust and save the rolling line of the mill in the previous rolling state.

[0013] Step 6: Roll the workpiece using the saved rolling line position, and repeat steps 1 to 5 until the workpiece's external dimensions meet the pre-judged conditions during the rolling process.

[0014] Further:

[0015] The profilometer includes an upper probe, a lower probe, an OS-side probe, and a DS-side probe. The upper probe is a planar profile scanner, and the OS-side probe and the DS-side probe are both distance detectors.

[0016] In steps one and two, the upper and lower expansion prediction conditions are used, and the contour detection data is the upper flange width value H of the i-th pass. Ai and upper flange width value H B .

[0017] In step three, the relationship between the finished flange width B / 2 and DR (I+△i-(K+△k+R)) is determined.

[0018] In step four, the height of the rolling line or the height of the oscillating roller table is adjusted in subsequent passes. If the height of the rolling line is adjusted in subsequent passes, the adjustment value is 1.0-2.0 mm each time; if the height of the oscillating roller table is adjusted in subsequent passes, the adjustment value of the oscillating roller table is 2.0-5.0 mm each time.

[0019] The upper probe collects data from the rolled piece, draws an image based on the data, and then compares it with the center line of the rolled piece to calculate the offset.

[0020] In step three, if B / 2≥DR, the rolling line will be higher than the roller table position, resulting in a downward expansion phenomenon. In this case, the rolling line position △i or the oscillating roller table position △k will be adjusted in subsequent passes to make B / 2-D+R=0.

[0021] In the third step, if B / 2 < D - R, an upward and downward expansion phenomenon will occur when the rolling line is lower than the roller path position. Subsequently, in the subsequent passes, adjust the rolling line position △i of the rolling mill or adjust the position △k of the swing roller path to make B / 2 - D + R = 0.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] The production control method for the flange slope of hot-rolled H-beams is reasonably designed, which can help workers judge online in real time whether the size and shape of the rolled piece meet the standard requirements, and can adjust online according to the judgment results, effectively control the problem of excessive flange slope during the production of hot-rolled H-beams, thereby improving the product quality of hot-rolled H-beams and enhancing their成材率. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The following briefly describes the content expressed in each drawing of this specification and the marks in the drawings:

[0025] Figure 1 It is a schematic diagram of the finishing rolling of the present invention.

[0026] Figure 2 It is a schematic diagram of the finishing rolling parameters of the present invention.

[0027] Figure 3 It is a schematic diagram of the control flow of the present invention.

[0028] Figure 4 It is a schematic diagram of the detection position of the profilometer of the present invention.

[0029] Figure 5 It is a schematic diagram of the upward and downward expansion phenomenon that will occur when the existing rolling line is lower than the roller path position.

[0030] Figure 6 It is a schematic diagram of the downward and upward expansion phenomenon that will occur when the existing rolling line is higher than the roller path position.

[0031] In the figure:

[0032] 1 - upper roll; 2 - lower roll; 3 - one side vertical roll; 4 - the other side vertical roll; 5 - swing roller path; 6 - rolled piece; 7 - red inspection profilometer; D is the distance between the center line of the roll and the center of the swing roller path; R is the radius of the swing path, B is the flange height of the H-beam; I is the initial height of the rolling line; K is the initial height of the rolling roller path. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The following further describes in detail the specific embodiments of the present invention by describing the embodiments in conjunction with the drawings.

[0034] As Figures 1 to 4 shown, the production control method for the flange slope of hot-rolled H-beams includes the following steps:

[0035] Step 1: Use a profilometer to check the data of the H-beam rolled steel section;

[0036] Step 2: Determine whether the data detected by the profilometer meets the pre-judgment conditions of the standard requirements under hot steel conditions;

[0037] Step 3: If the pre-judgment conditions are met, save the previous rolling state. If the pre-judgment conditions are not met, determine the relationship between the finished flange width B / 2 and DR, where DR = I + Δi - (K + Δk + R); where B is the flange height of the H-beam, D is the distance between the center line of the roll and the center of the oscillating roller table, R is the radius of the oscillating roller table, I is the initial height of the rolling line, K is the initial height of the oscillating roller table, Δi is the height offset of the rolling line, and Δk is the height offset of the oscillating roller table.

[0038] Step 4: Determine the current rolling line position of the rolling mill based on the data measured by the profilometer;

[0039] Step 5: Based on the relationship between the finished flange width B / 2 and DR obtained in Step 3, and the rolling line position obtained in Step 4, adjust and save the rolling line of the mill in the previous rolling state.

[0040] Step 6: Roll the workpiece 6 using the saved rolling line position, and repeat steps 1 to 5 until the workpiece's external dimensions meet the pre-judged conditions during the rolling process.

[0041] The present invention provides a method for controlling the flange slope of hot-rolled H-beams, offering a predictive condition for improving dimensional shape. This method helps workers to judge online in real time whether the dimensions and shape of the rolled product meet the standard requirements, and can make adjustments online based on the judgment results. This effectively controls the problem of excessive flange slope during the production of hot-rolled H-beams, thereby improving the product quality and yield of hot-rolled H-beams.

[0042] in,

[0043] The profilometer includes an upper probe, a lower probe, an OS-side probe, and a DS-side probe. The upper probe is a planar profilometer, while the OS-side and DS-side probes are both distance detectors, preferably a red-light profilometer 7. The upper roll 1 is located above the workpiece, and the lower roll 2 is located below the workpiece. The upper and lower rolls are arranged opposite each other, with one side vertical roller 3 and the other side vertical roller 4 arranged opposite each other on both sides. The swing roller table 5 is arranged in front of, behind, and to the side of the lower roll. The OS-side and DS-side probes are respectively located opposite each other on both sides of the workpiece.

[0044] Steps one and two are the upper and lower expansion prediction conditions, and the contour detection data is the upper flange width value H of the i-th pass. Ai and upper flange width value H B .

[0045] In Step 3, judge the relationship between the width B / 2 of the finished product flange and D - R, that is, (I + Δi - (K + Δk + R)). If B / 2 ≥ D - R, a phenomenon of downward convergence and upward expansion will occur when the rolling line is higher than the position of the roller table. Then, in subsequent passes, adjust the position Δi of the rolling mill rolling line or adjust the position Δk of the swing roller table to make B / 2 - D + R = 0. If B / 2 < D - R, a phenomenon of upward convergence and downward expansion will occur when the rolling line is lower than the position of the roller table. Then, in subsequent passes, adjust the position Δi of the rolling mill rolling line or adjust the position Δk of the swing roller table to make B / 2 - D + R = 0.

[0046] In Step 4, if it is judged that the rolled piece has the phenomenon of through-strip upward and downward convergence and expansion, adjust the height of the rolling line in subsequent passes, and the adjustment value each time is 1.0 - 2.0 mm. If the height of the swing roller table is adjusted, the adjustment value of the swing roller table for each pass is 2.0 - 5.0 mm.

[0047] The upper detector collects data of the rolled piece, draws an image based on the data, and then compares it with the center line of the rolled piece to calculate the offset. The worker combines the control method of the present invention, and then effectively solves the problem of excessive flange slope during the production of hot-rolled H-beams by designing the relative positions of the rolling line of the universal rolling mill, the upper and lower guide guards and their inlet and outlet rolling lines.

[0048] Example 1:

[0049] For the H700*300*13*24 hot-rolled H-beam, the BB1 billet is heated in the furnace, descaled, and then sent to the BD rolling mill for blooming, and enters the universal roughing mill (U1 - E - U2) for reciprocating rolling, and finally forms in the universal finishing mill. When B / 2 < (D - R), that is, when the rolling line is lower than the position of the roller table, a phenomenon of upward convergence and downward expansion will occur. When B / 2 > (D - R), that is, when the rolling line is higher than the position of the roller table, a phenomenon of downward convergence and upward expansion will occur. For such rolled pieces with excessive flange slope, the relative positions of the rolling line, the swing roller table and the guide guard can be adjusted to avoid a large drop in the relative position, and effectively solve such problems.

[0050] The flange slope of the H-beam produced by using the production control method provided by the present invention is within the standard control range, meeting the requirements of customers and reducing the economic losses caused by quality objections.

[0051] The above has described the present invention in an exemplary manner with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the 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 protection scope of the present invention.

Claims

1. A method for controlling the flange slope of hot-rolled H-beams during production, characterized in that: The described production control method includes the following steps: Step 1: Detect the data of the H-beam rolled piece using a profilometer; Step 2: Determine whether the data detected by the profilometer meets the pre-judgment conditions of the standard requirements under the hot steel state; Step 3: If the pre-judgment conditions are met, save the previous rolling state. If the pre-judgment conditions are not met, then judge the relationship between the finished product flange width B / 2 and D - R, where D - R = I + △i - (K + △k + R); here, B is the flange height of the H-beam, D is the distance between the center line of the rolling mill and the center of the swing roller table, R is the radius of the swing roller table, I is the initial height of the rolling line, K is the initial height of the swing roller table, △i is the height offset of the rolling line, and △k is the height offset of the swing roller table; Step 4: Judge the position of the rolling line of the current rolling mill according to the data measured by the profilometer; Step 5: Adjust the rolling line of the rolling mill in the previous rolling state and save it according to the relationship between the finished product flange width B / 2 and D - R obtained in Step 3, and the rolling line position obtained in Step 4; Step 6: Roll the rolled piece using the saved rolling line position, and repeat Steps 1 to 5 until the external dimensions of the rolled piece meet the pre-judgment conditions; Among them, In Step 3, if B / 2 > D - R, a phenomenon of downward and upward expansion will occur when the rolling line is higher than the roller table position. Then, in subsequent passes, adjust the rolling line position of the rolling mill or adjust the position of the swing roller table to make B / 2 - D + R = 0; In Step 3, if B / 2 < D - R, a phenomenon of upward and downward expansion will occur when the rolling line is lower than the roller table position. Then, in subsequent passes, adjust the rolling line position of the rolling mill or adjust the position of the swing roller table to make B / 2 - D + R = 0.

2. The method for controlling the flange slope of hot-rolled H-beams as described in claim 1, characterized in that: The described profilometer includes an upper detector, a lower detector, an OS side detector and a DS side detector. The upper detector is a planar profile scanner, and both the OS side detector and the DS side detector are distance detectors.

3. The method for controlling the flange slope of hot-rolled H-beams as described in claim 2, characterized in that: The upper detector collects the data of the rolled piece, draws an image based on the data, and then compares it with the center line of the rolled piece to calculate the offset.

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